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Particular electrode structure or spacing

Subclass of:

313 - Electric lamp and discharge devices

313118000 - SPARK PLUGS

Patent class list (only not empty are listed)

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Class / Patent application numberDescriptionNumber of patent applications / Date published
313142000 Gap on and along axis 7
Entries
DocumentTitleDate
20130026903SPARK PLUG - An electrode tip located at an distal end of an electrode of a spark plug comprises Pd as a predominant component in an amount of 40 wt. % or more; at least one element of Ir, Ni, Co, and Fe, wherein, when the tip contains Ir, the amount of Ir is 0.5 wt. % to 20 wt. %, and when the tip contains at least one element of Ni, Co, and Fe, the amount of the at least one element is 0.5 wt. % to 40 wt. %; and at least one element of Pt, Re, Rh, and Ru in a total amount of 5 wt. % to 40 wt. %, wherein when the tip contains at least one element of Re, Rh, and Ru, the amount of the at least one element is 10 wt. % or less, and when the tip contains Pt, the amount of Pt is 16 wt. % to 40 wt. %. The electrode tip, which comprises Pd as the main component, has improved resistance to spark-caused wear and reduced occurrence of separation and cracking of the tip.01-31-2013
20110193471SPARK PLUG AND MANUFACTURING METHOD THEREFOR - A spark plug in which the center electrode is formed by laser welding along the circumference of a joint surface between a center electrode base metal and a noble metal tip in excess of full circumference. When G represents a spark gap and A represents a shortest gap between a laser weld bead and a line drawn parallel with axis X, A≦3G. Straight lines S08-11-2011
20110193469SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A spark plug having a ground electrode that includes a press-formed recess portion comprised of a first portion with which a working pin has come into contact, and a second portion with which the working pin has not come into contact. A relation B08-11-2011
20100117506SPARK PLUG - A spark plug comprised of a spark plug main body and a cylindrical pressing member used for mounting the spark plug main body on an internal-combustion engine. The spark plug main body includes a cylindrical metal shell. A removing-tool engagement portion is formed on an outer circumferential face of the metal shell at a front end side of a caulking portion. The removing-tool engagement portion is used for engaging with a tool, when removing the spark plug main body from a plug hole of an internal-combustion engine.05-13-2010
20130076224SPARK PLUG FIRING END CONFIGURATION - A spark plug includes a metallic shell, an insulator, a center electrode body, a ground electrode body, and a ground electrode tip. In one embodiment, the ground electrode tip includes a non-precious metal piece and a precious metal piece attached to each other. The non-precious metal piece has a side surface attached to a free end surface of the ground electrode body.03-28-2013
20100045156Electrode for a spark plug - An electrode is provided for a spark plug made of a base material and at least one additive material situated in the base material in a dispersedly distributed manner, which is intercalated in the base material, and is a metal oxide, and is characterized by a negative enthalpy of formation greater than 800 kJ/mol O02-25-2010
20130038198SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING THE SPARK PLUG - A spark plug includes a center electrode, a ground electrode, and a noble metal tip. The noble metal tip is joined to an object member of at least one of two electrodes via a fusion zone. A projected overlap region of the noble metal tip and the fusion zone accounts for 70% or more of a projected region of the noble metal tip. The object member contains at least Si out of Al and Si such that the amount of Si is 0.4% by mass or higher and such that the total amount of Al and Si is 0.5% by mass. Multi-fusion spots exist on the surface of the fusion zone. Segments of a baseline which pass through the respective multi-fusion spots have a total length of a predetermined percentage of the length of the baseline. Joining strength to the noble metal tip can thereby be greatly improved when the member to be joined contains Si.02-14-2013
20130088139SPARK PLUG - A spark plug which exhibits improved resistance to high-temperature oxidation of an electrode, and improved resistance to spark-induced erosion of, improved resistance to oxidation of, and improved joining reliability of a tip joined to the electrode. A spark plug has spark members; each of the spark members has a weight of 1.5 mg or more; and a center electrode and a ground electrode contain Ni as a main component, C in an amount of 0.005% by mass to 0.10% by mass, Si in an amount of 1.05% by mass to 3.0% by mass, Mn in an amount of 2.0% by mass or less, Cr in an amount of 20% by mass to 32% by mass, and Fe in an amount of 6% by mass to 16% by mass.04-11-2013
20120212119ELECTRODE MATERIAL FOR A SPARK PLUG - An electrode material may be used in spark plugs and other ignition devices including industrial plugs, aviation igniters, glow plugs, or any other device that is used to ignite an air/fuel mixture in an engine. In one embodiment, the electrode material has one or both of iridium (Ir) or ruthenium (Ru), and has rhenium (Re).08-23-2012
20120181916CORONA IGNITER HAVING SHAPED INSULATOR - A corona igniter (07-19-2012
20090302733SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING THE SAME - A spark plug having a center electrode; an insulator having an axial hole extending in the direction of an axis; a metallic shell; a ground electrode extending from a front end portion of the metallic shell; a center-electrode-side noble metal chip joined to a distal end surface of the center electrode; and a ground-electrode-side noble metal chip joined to a distal end surface of the ground electrode, the ground-electrode-side noble metal chip having a distal end surface facing toward a side surface portion of the center-electrode-side noble metal chip, and the ground electrode being bent at an angle that falls within a range of 120° to 140° inclusive.12-10-2009
20120217864SPARK PLUG - A spark plug having an insulator that can be restrained from cracking in an environment of heating and cooling cycles. The spark plug includes an insulator having an axial bore extending in the direction of the axis, and a center electrode held in one end portion of the axial bore. The center electrode has an outer layer, and a core provided within the outer layer and formed from a material higher in thermal conductivity than the outer layer. After a heat treatment, the outer layer has a high-hardness region having a hardness of 190 Hv or higher and a thickness of 30 μm to 200 μm, and an element supply region having a thickness of 50 μm or more.08-30-2012
20130069517SPARK PLUG - A spark plug includes a center electrode, a ground electrode formed of a metal material containing 95% or more of nickel and a substantially cylindrical metal shell having a front end face to which one end of the ground electrode is welded. In the spark plug, the conditions: 0.15 mm≦BD≦0.40 mm; and (EW03-21-2013
20130069516SPARK PLUG - A spark plug includes a ceramic insulator, a center electrode, a metallic shell, and a ground electrode. The center electrode has a shoulder portion at a forward end portion, which tapers forward with respect to the axial direction. A noble metal tip is joined to the forward end portion of the center electrode through a fusion zone. A spark discharge gap is formed between the noble metal tip and the ground electrode. The shortest distance between the fusion zone and a forward end surface of the noble metal tip is 0.8-1.2 mm. The outside diameter of the fusion zone as measured at a forward end of the fusion zone is smaller than that as measured at a rear end of the fusion zone. An acute angle θ03-21-2013
20110012500SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug comprising: a cylindrical metal shell; a cylindrical insulator provided in an inner hole of said metal shell; a center electrode provided in a leading end side inner hole of said insulator; and a ground electrode having one end bonded to a leading end side of said metal shell and having another end face forming a spark discharge gap with said center electrode, wherein said ground electrode comprises an electrode material containing from 0.5 to 1.5 wt. % of Si, from 0.5 to 1.5 wt. % of Al, from 0.02 to 1.0 wt. % of at least one of Ti, V, Zr, Nb and Hf, from 0.03 to 0.09 wt. % of C and 95.5 wt. % or more of Ni, and having a specific resistance at 20° C. of 25 tincm or less.01-20-2011
20110012499METHOD OF PRODUCING SPARK PLUG, AND SPARK PLUG - A method of producing a spark plug includes reducing the diameter of a center electrode while maintaining the heat dissipation property of the center electrode. A columnar member in which an outer skin member and a core member having a high thermal conductivity are clad, and which is columnarly extended, are configured by extrusion molding into a state where the thickness of the outer skin member is substantially uniform. A flange portion and a tip end portion are formed in the columnar member to obtain an electrode intermediate member. In a middle trunk portion of the electrode intermediate member, the thickness of the outer skin member is maintained. Then, the surface of the middle trunk portion is cut or polished to reduce the thickness, whereby the diameter of a center electrode is reduced while maintaining the outer diameter of the core member.01-20-2011
20110012498SPARK PLUG INCLUDING HIGH TEMPERATURE PERFORMANCE ELECTRODE - A spark plug (01-20-2011
20130063017SPARK PLUG INCLUDING ELECTRODES WITH LOW SWELLING RATE AND HIGH CORROSION RESISTANCE - A spark plug (03-14-2013
20120235555SPARK PLUG AND METHOD FOR THE PRODUCTION THEREOF - A method for producing a spark plug which contains an inner conductor, an insulator surrounding the inner conductor, a spark plug body surrounding the insulator, and two electrodes forming an ignition gap. The first electrode is a center electrode connected to the inner conductor in an electrically conducting manner and the second electrode is a ground electrode connected to the spark plug body in an electrically conducting manner. An iridium component which contains more than 95 percent by weight of iridium is welded onto one of the electrodes. An iridium component that is punched out of an iridium sheet and has a thickness that is less in size than its diameter is also employed.09-20-2012
20110133626SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING THE SAME - A spark plug having sufficient durability for an internal combustion engine is provided by restraining a sharp increase in resistance of a resistor while the size of the spark plug is reduced. The spark plug comprises an insulator having an axial hole, a metallic shell provided on the outer circumference of the insulator, a center electrode inserted into a front end portion of the axial hole, a terminal electrode inserted into a rear end portion of the axial hole, and a ground electrode. A circular columnar resistor is disposed within the axial hole between the center electrode and the terminal electrode, thereby electrically connecting the center electrode and the terminal electrode. The resistor is composed of carbon black serving as a conductive material, a glass powder, and ceramic particles. The ceramic particles have a maximum particle size of 0.5 μm or less.06-09-2011
20110133625SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A spark plug (06-09-2011
20110279008SPARK PLUG - A spark plug may include a first electrode, an insulator positioned radially outside the first electrode, and a housing positioned radially outside the insulator. The spark plug may also include a second electrode electrically coupled to the housing. The second electrode may form a spark gap with the first electrode. The spark plug may further include an ignition electrode coupled to at least one of the first electrode and the second electrode. The ignition electrode may include fibers of Nb—Ti within a matrix material.11-17-2011
20090079319SPARK PLUG STRUCTURE FOR IMPROVED IGNITABILITY - Exemplary embodiments of the present invention provide a spark plug for use in conjunction with an internal combustion engine, and, more particularly, to a spark plug having a structure providing improved ignition capability. In one particular configuration, a spark plug is provided forming a gap between a center electrode and an insulator of the spark plug. However, it will become apparent that other configurations are contemplated as well, as shown and described herein.03-26-2009
20110279009SPARK IGNITION DEVICE AND GROUND ELECTRODE THEREFOR AND METHODS OF CONSTRUCTION THEREOF - A spark ignition device, ground electrode therefor, and methods of construction thereof are provided. The spark ignition device includes a generally annular ceramic insulator with a metal shell surrounding at least a portion of the ceramic insulator. A center electrode is received at least in part in the ceramic insulator and a ground electrode extends from the shell to a free end portion. A firing tip is attached adjacent the free end portion of the ground electrode to provide a spark gap between the center electrode and the firing tip. The free end portion is at least partially bounded by at least one “as laser cut” peripheral side extending adjacent the firing tip.11-17-2011
20100019644SPARK PLUG - A spark plug of the present invention is designed as a small-diameter spark plug, which includes: a metal shell having a mounting thread formed with a nominal diameter of M12 or smaller based on JIS standard; a ground electrode consisting a first structural member extending from one end toward the other end thereof and at least one ith structural member (i=2, 3, 4, 5) laminated to cover an outer surface of the first structural member, the length of protrusion of the other end of the ground electrode from a front end face of the metal shell being 4.5 mm or larger, the ground electrode having a bent portion formed between the one end to the other end thereof with a curvature radius of 2.3 mm or smaller; and an electrode tip joined to the other end of the ground electrode at a position facing the front end of the center electrode and having a protrusion length of 0.5 mm or larger and a cross sectional area of 0.20 to 1.13 mm01-28-2010
20120007488PLASMA JET IGNITION PLUG - An ignition plug that maintains excellent ignition performance over a long period of time through effective prevention of channeling. The ignition plug includes an insulator having an axial bore, a center electrode inserted into the axial bore, a metallic shell disposed externally of the outer circumference of the insulator, and a ground electrode fixed to a front end portion of the metallic shell. A cavity is defined by the wall surface of the axial bore and the front end surface of the center electrode. The ground electrode includes a body whose distal end portion is disposed away from the front end of the insulator, and a protrusion protruding from the body.01-12-2012
20110285270SPARK PLUG - A spark plug 11-24-2011
20110121713SPARK PLUG WITH PLATINUM-BASED ELECTRODE MATERIAL - A spark plug for an internal combustion engine has one or more electrodes with an electrode material of a platinum (Pt) based alloy. The alloy includes aluminum (Al) and one or more refractory metals selected from the group containing nickel (Ni), rhenium (Re), ruthenium (Ru), tantalum (Ta), molybdenum (Mo), and tungsten (W). In at least some of the disclosed alloys, the aluminum contributes to the formation of an aluminum oxide (Al05-26-2011
20090284117SPARK IGNITION DEVICE FOR AN INTERNAL COMBUSTION ENGINE AND SPARKING TIP THEREFOR - A spark ignition device is provided having an electrode sparking tip constructed from an AuPd alloy with the addition of at least 3 wt. % of a precious metal element selected from at least one of platinum, iridium, rhodium and ruthenium. The gold counteracts oxidation of the palladium and the additional elements provide the sparking tip with high temperature and high strength mechanical properties and resistance to alloying with the combustion constituents during use.11-19-2009
20090091232SPARKPLUG FOR AN INTERNAL COMBUSTION ENGINE - Sparkplug (04-09-2009
20120153799PLASMA JET IGNITION PLUG - A plasma jet ignition plug exhibiting high plasma generation efficiency while restraining occurrence of preignition. P1 represents the position of a rear end of a region of a metallic shell ledge, the region being in contact with an insulator. P2 represents the position of a rear end of a region of the insulator ledge, the region being in contact with the center electrode. Front end surfaces of the metallic shell, the insulator, and center electrode, an imaginary plane S1 which is perpendicular to the axis and contains position P1, and an imaginary plane perpendicular to the axis and contains position P2 are disposed in this order from front side to rear side along the axis. The axial distance A from the front end surface of the insulator to imaginary plane S1 and axial distance B from the imaginary plane S1 to imaginary plane S2 satisfy 0.5×A≦B.06-21-2012
20110291543IGNITER ASSEMBLY INCLUDING ARCING REDUCTION FEATURES - A corona igniter (12-01-2011
20110198982SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A spark plug capable of increasing a welding strength between a leading end of a metal shell and a base end of a ground electrode to avoid fracture of a welded part due to vibrations and the like even when making the metal shell smaller. The spark plug satisfies a relation of S08-18-2011
20100264804SPARK PLUG - A center electrode includes a tapered electrode base member mount and a noble metal tip joined to the electrode base member mount via a fused portion in which the component of the noble metal tip and the component of the electrode base member mount are fused. In this state, the cross section area S10-21-2010
20090189502METHOD OF PRODUCING SPARK PLUG, AND SPARK PLUG - It is an object of the invention to provide a method of producing a spark plug in which, in order to reduce the size of the spark plug, the diameter of a center electrode can be reduced while maintaining the heat dissipation property of the center electrode, and also such a spark plug. A columnar member 07-30-2009
20090189503HIGH THREAD GROUND SHIELD - A spark plug for an internal combustion engine comprises an elongated center electrode having a center electrode tip at one end and a terminal proximate the other end, an insulator substantially surrounding the center electrode, and a ground shield. The insulator has a substantially cylindrical body with at least a first insulator section and a second insulator section. The first and second insulator sections having first and second diameters respectively and are separated by an insulator shoulder. The ground shield has an elongated base section substantially surrounding the first insulator section, a frustoconical flange protruding from one end of the base section to engage the insulator shoulder, and a ground electrode extending from the other end of the base section to define an axial spark gap with respect to the center electrode tip. The base section and the ground electrode are formed as separate components and secured together to form the ground shield.07-30-2009
20110193470SPARK PLUG AND MANUFACTURING METHOD THEREOF - There is provided a spark plug 08-11-2011
20130214671SPARK PLUG - A spark plug has a metal shell and a ground electrode joined at a base end portion thereof to the metal shell and includes a surface layer and a core higher in thermal conductivity than the surface layer. The surface layer has a thickness of 0.2 to 0.4 mm at a specific position that is located 1 mm from the base end portion. The spark plug satisfies the following condition: W08-22-2013
20130214669SPARK PLUG - A spark plug includes a tubular metal shell extending in an axial direction, wherein the metal shell includes: an externally threaded portion formed on a tip end side of an outer periphery of the metal shell; a seat portion formed on a rear end side of the externally threaded portion in the axial direction and protruding radially outward; and a nickel layer provided on an outer surface of the metal shell, wherein the nickel layer contains phosphorus, and a phosphorus concentration in a portion in which a nickel concentration is 50 at % in a thickness direction of the nickel layer itself is 6 at % or more and 20 at % or less.08-22-2013
20090153009WORKING ELECTRODE FOR AN ELECTRODYNAMIC FRAGMENTING INSTALLATION - The invention relates to working electrode for an electrodynamic fragmenting installation. The working electrode comprises an insulator (06-18-2009
20100109502SPARK PLUG MANUFACTURING METHOD, AND SPARK PLUG - There is provided according to the present invention a manufacturing method of a spark plug that includes a cylindrical metal shell, a cylindrical ceramic insulator retained in the metal shell, a center electrode retained in the ceramic insulator and extending in an axial direction and a ground electrode having a rear end portion fixed to the metal shell and a front end portion formed with a protruding region facing a front end portion of the center electrode with a gap left therebetween and being of substantially uniform thickness except for an area where the protrusion is formed. The spark plug manufacturing method includes a press forming step for pressing the whole of a ground electrode material for constituting the ground electrode, so as to form a protruding region on a front end portion of the ground electrode material and a welding step for, after the press forming step, welding a rear end portion of the ground electrode material to the metal shell.05-06-2010
20090096345Uniquely designed internal combustion engine spark plug that will produce two independent ignition sparks between the spark plug electrodes for each single electrical ignition coil discharge - This invention is an improvement to the internal combustion engine spark plug used to ignite the fuel air mixture in the engine combustion chamber. All spark plugs manufactured today produce one ignition spark for each high voltage electrical discharge of the ignition coil regardless of the number of spark plug electrodes used in the manufacture of the spark plug. This invention uses an intermediate electrically neutral electrode placed between the spark plug center electrode and the ground strap electrode creating two separate spark air gaps. For each single high voltage electrical discharge of the ignition coil, a spark will occur between the center electrode and the intermediate electrode and another distinct and separate spark will occur between the intermediate electrode and the ground strap electrode. Because the two ignition sparks are electrically in series, both will have the same electrical energy.04-16-2009
20090146542RADIOFREQUENCY PLASMA SPARK PLUG - A radiofrequency plasma spark plug configured to equip a combustion chamber including: an annular shell with a main axis; a central electrode made of a conductive material, extending along the main axis and including an inner portion arranged inside the annular shell and an outer portion arranged outside the annular shell: an annular electrically insulating part extending at least about the inner portion of the central electrode so as to be interposed between the shell and the electrode, the insulating part only covering part of the outer portion of the central electrode. The insulating part includes an annular flange concealing the entire circular terminal surface of the shell relative to the uncovered part of the electrode.06-11-2009
20090309474SPARK PLUG - A spark plug has a center electrode, a ceramic insulator having an axial hole to support the center electrode therein, a metal shell holding the ceramic insulator, and a ground electrode, one end portion of which is fixedly connected with the metal shell, the other end portion of which is located apart from an outer circumferential surface of a top end portion of the center electrode for defining a spark discharge gap therebetween. The ceramic insulator is provided with recesses at an edge portion between a top end surface of the ceramic insulator and an inner circumferential surface of the axial hole. When defining first and second imaginary circles with the axis being their respective centers as circles passing through portions of the recesses whose radial distances from the axis are a maximum and a minimum respectively, a difference of diameters of the first and second imaginary circles is 0.08 mm or less.12-17-2009
20110062850Pre-Chamber Spark Plug and Electrodes Therefor - An electrode for a spark plug includes a contact portion. In a particular embodiment, the electrode further includes an annular base and a support portion formed from a different material than the contact portion. The contact portion may be aligned axially with a central axis of the annular base. Further, the contact portion is configured to shield the annular base and the support portion from a second electrode inserted into the annular base.03-17-2011
20090302732ALLOYS FOR SPARK IGNITION DEVICE ELECTRODE SPARK SURFACES - An electrode for a spark ignition device, including a spark plug, which includes an alloy consisting essentially of, in weight percent, at least 15% Ni and the balance substantially Pt, and more particularly 15-45% Ni and the balance substantially Pt; 5-35% W, and the balance substantially Pd; and 5-15% Ni, 5-15% Pt, less than 10% Ir, and the balance substantially Pd.12-10-2009
20090160305SPARK PLUG - A spark plug includes an outer electrode including an outer electrode tip of which a distal end surface is spaced from an outer peripheral surface of a leading end portion of a center electrode to define a spark discharge gap. A protruding insulator portion of a cylindrical insulator protrudes at least 1.0 mm from a leading end surface of a cylindrical metal shell. A protruding center electrode portion of the center electrode protrudes at least 3.5 mm from the leading end surface of the cylindrical metal shell. A relationship (θ06-25-2009
20090284118SPARK PLUG CONFIGURATION HAVING A NOBLE METAL TIP - A spark plug having a particular firing end configuration that satisfies numerous dimensional ranges for improved performance. The spark plug generally includes a shell, an insulator, and center and ground electrodes, with the electrodes each having a copper core for improved thermal conductivity and a noble metal insert for improved erosion and corrosion resistance. The noble metal insert for the center electrode is preferably in the form of a cylindrical Ir-based tip, which is received within a complimentary recess formed in the center electrode. The noble metal insert for the ground electrode is in the form of a flat Pt-based pad attached to a surface of the ground electrode. Various dimensional ranges are provided for the various components of the spark plug assembly, both individually and in combination with other dimensions.11-19-2009
20110198981SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug is provided with a ground electrode, a noble metal tip made of a Pt alloy, and a relieving layer tip made of a Pt alloy which has a linear expansion coefficient between that of the ground electrode and that of the noble metal tip.08-18-2011
20090289540SPARK PLUG - A spark plug comprising a center electrode, a first noble metal tip joined to the center electrode, an insulator, a metallic shell, a ground electrode joined to the metallic shell and including an outer layer and an inner layer, and a second noble metal tip joined to the ground electrode by way of a melted portion, wherein in a cross section of the ground electrode, the protrusion height A of the second noble metal tip is 0.4 mm or more, the ground electrode includes a substantially flat joining surface to which the second noble metal tip is joined and an outwardly curved surface, the inner layer has at the joining surface side a substantially flat surface or recessed surface, and the minimum distance F between the melted portion and the inner layer is 0.1 mm or more.11-26-2009
20090289539SPARK PLUG - A spark plug including: a center electrode; an insulator; a metal shell; a ground electrode; and an electrode chip. The electrode chip is joined to the ground electrode in a state in which the electrode chip is engaged in a recess portion formed in the ground electrode. The electrode chip is formed by previously welding a chip body portion containing a noble metal and a chip holding portion containing Ni before the electrode chip is joined to the ground electrode. A first molten bond is formed by welding the chip body portion and the chip holding portion. The first molten bond is placed in the recess portion so as not to be exposed to an outside environment in a state in which the electrode chip is engaged in the recess portion and joined to the ground electrode.11-26-2009
20110169396SEMICONDUCTOR CERAMIC - A semiconductor ceramic including a microstructure including 5 to 40% by volume of a particulate conducting phase, and 60 to 95% by volume of a particulate insulating phase, a size of the particles of the conducting phase being between 5 nm and 11 μm, 65 to 80% of the particles of the conducting phase having an average diameter smaller than 1 μm, and 20 to 35% of the conducting particles having an average diameter between 1 and 11 μm, and a distance between two adjacent particles of the conducting phase being between 30 Angström and 5 μm.07-14-2011
20130099654SPARK PLUG ELECTRODE AND SPARK PLUG MANUFACTURING METHOD - A method of making a spark plug electrode includes several steps. One step includes providing an inner core of a ruthenium (Ru) based alloy or an iridium (Ir) based alloy. Another step includes providing an outer skin over a portion or more of the inner core in order to produce a core and skin assembly. The outer skin can be made of platinum (Pt), gold (Au), silver (Ag), nickel (Ni), or an alloy of one of these. Yet another step includes increasing the temperature of the core and skin assembly. And another step includes hot forming the core and skin assembly at the increased temperature.04-25-2013
20080284305SMALL-DIAMETER SPARK PLUG WITH RESISTIVE SEAL - A spark plug (11-20-2008
20080284304SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - There is provided a spark plug that includes a center electrode, an insulator, a housing, a ground electrode, an auxiliary ground electrode, and a projected portion in the housing. The housing has a though-hole which is formed in the housing along the longitudinal axis of the center electrode and has an opening of the through-hole at the first housing end. The ground electrode has a first end facing the end of the center electrode to form a first discharge gap. The auxiliary ground electrode has a first end facing an outer peripheral surface of the first end of the insulator to form a second discharge gap. The projected portion is formed in a hollow portion of the through-hole and is projected from an inner peripheral surface of the hollow portion of the housing.11-20-2008
20120293061SPARK PLUG - A spark plug including a center electrode and a ground electrode having a gap between the center electrode and the ground electrode, the ground electrode has an outer layer which is formed from an Ni-based alloy and a core portion which is covered by the outer layer and formed from a material having a thermal conductivity higher than that of the outer layer. Further, the melting point of the Ni-based alloy forming the outer layer is 1150° C. or more and 1350° C. or less.11-22-2012
20080309213SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - In the spark plug, the ground electrode located so as to form a spark discharge gap with the center electrode thereof includes a ground base member fixed to the mounting fitting thereof and an electrode support member connected to the ground base member. The electrode support member has an opposed surface on which a projecting member is mounted so as to face the center electrode across from the spark discharge gap, and a retreating surface continuing the opposed surface and having such a shape as to approach a fore-end of the spark plug with distance from a junction between the projecting member and the opposed surface. The ground electrode further includes an angular portion at each of intersections between its back surface portion on which the electrode support member is provided, and the retreating surface.12-18-2008
20080278053Spark Plug - To provide a spark plug in which separation of a tip can be prevented and enough wear resistance can be obtained without increasing the content of nickel in the tip portion, and a use method of the spark plug.11-13-2008
20100264802SPARK PLUG AND PROCESS FOR PRODUCING THE SPARK PLUG - A spark plug in which an ignition portion of a ground electrode formed through joining of a noble metal chip to the ground electrode has high durability, and a method of manufacturing the spark plug.10-21-2010
20100264801SPARK PLUG AND PROCESS FOR PRODUCING THE SPARK PLUG - A spark plug in which an ignition portion of a ground electrode formed through joining of a noble metal chip to the ground electrode has high durability, and a method of manufacturing the spark plug.10-21-2010
20100264803SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD FOR MANUFACTURING SPARK PLUG - A spark plug including a center electrode and a ground electrode. A center electrode noble metal tip is joined to a leading end portion of a center electrode, and a ground electrode noble metal tip is joined to a center-electrode-side side surface of the ground electrode. A distal end portion of the ground electrode noble metal tip protrudes from a distal-end surface of the ground electrode by 0.1 mm to 1.5 mm. A center-electrode-side side surface of the ground electrode noble metal tip projects from a center-electrode-side side surface by 0.15 mm to 0.6 mm. The ground electrode includes chamfered portions. Thickness lengths and widthwise lengths of the respective chamfered portions achieved within a cross section perpendicular to a center axis of the ground electrode are set to 0.2 mm or more.10-21-2010
20090160304SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug includes a ground electrode formed with a flat region and a convex curved region on an outer peripheral surface thereof. The flat region is located on a front end of the ground electrode and has a length of 0.2 mm or more from a front end face of the ground electrode in a longitudinal direction of the ground electrode. The ground electrode satisfies the following dimensional condition (1) with respect to first and second cross sections of the ground electrode taken through the convex curved region and the flat region in directions perpendicular to the longitudinal direction of the ground electrode,06-25-2009
20090127998SPARK PLUG - A spark plug including: a center electrode including an electrode base member and a core member; an electrode tip joined to the center electrode via a molten bond; an insulator holding the center electrode; a metal shell holding the insulator; and a ground electrode joined to the metal shell. Relationships d≦2.1 [mm] and −0.09×d+0.3305-21-2009
20090127997SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug including: a rod-shaped center electrode; an insulator; a metal shell; a ground electrode joined to the metal shell and bent toward the center electrode; a noble metal tip joined to an end portion of the ground electrode and opposing a leading end portion of the center electrode via a gap; and a bulge portion. A part of the noble metal tip is embedded in the ground electrode, and another part of the noble metal tip protrudes from a distal end surface of the ground electrode. A relationship A≧0.25 mm is satisfied where A (mm) is a protruding length of the noble metal tip from the distal end surface. The bulge portion covers a center part of a boundary between the noble metal tip and the end surface in a width direction.05-21-2009
20090140624SPARK PLUG INTERNAL COMBUSTION ENGINE AND METHOD FOR PRODUCING THE SPARK PLUG - A spark plug including: a center electrode; a substantially cylindrical insulator; a cylindrical metal shell; a ground electrode having a base end joined to a leading end portion of the metal shell and a distal end bent toward the axis line. The ground electrode includes: a thick portion provided on a base end side, a thin portion provided on a distal end side, and a stepped portion provided on an inner peripheral surface between the thick portion and the thin portion. A noble metal tip is joined to and partially embedded in the inner peripheral surface of the thin portion and disposed to form a gap between the noble metal tip and the leading end portion of the center electrode.06-04-2009
20110204766SPARK PLUG - A spark plug (08-25-2011
20090140625SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug including a ground electrode and a noble metal tip joined to a distal end portion of the noble metal tip. The noble metal tip is joined to the ground electrode via a molten bond in which the noble metal tip and the ground electrode are fused. A protruding length of the noble metal tip is 0.3 mm or more. Regarding the molten bond, relationships 50≦S06-04-2009
20090140623SPARK PLUG - A spark plug that comprises a terminal and a ceramic insulator. The ceramic insulator has ribs and a shaft. The ceramic insulator also has an insulator that extends from the shaft and terminates at an insulator tip. Extending from the insulator tip is a central electrode post. A ground electrode has a circular wall that extends from threads. The circular wall has a top rim. The top rim has a ridge that protrudes inwardly. The ridge terminates at an interior face.06-04-2009
20090026910Spark Plug - A spark plug (01-29-2009
20090167135Spark plug - An improved spark plug having a one-piece electrode of a particular alloy material, terminating in a firing end that has a plurality of extending tines, each tine having a downwardly end that is within a prescribed distance from the plug's firing ring.07-02-2009
20110227472Spark Plug and Method for Manufacturing a Spark Plug - What is described is a spark plug (09-22-2011
20130214668SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - The spark plug for an internal combustion engine has a cylindrical housing, a center electrode held inside the housing, a ground electrode connected to the housing and forming a spark discharge gap between itself and the center electrode, and, an end projection projected from the end portion of the housing toward the head end side of the spark plug. The center electrode and ground electrode are arranged so that most of the spark discharge gap is disposed over the open areas and the electrode area in which the end projection is arranged.08-22-2013
20100164352METHOD OF PRODUCING A SPARK PLUG VIA FLARED TIP ATTACHMENT - A side electrode for a spark plug is provided. The side electrode includes a side wire having a first end and a second end; an opening proximate to the first end, the opening extending from a first surface of the side wire to a second surface of the side wire, wherein the first surface has a flared portion proximate to the opening; and an electrode tip secured to the first end of the side wire, the electrode tip having a tip portion and a shaft portion, wherein the tip portion is located on the second surface and the shaft portion is secured to the side wire by engaging the flared portion.07-01-2010
20100259154SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND MANUFACTURING METHOD THEREOF - A spark plug comprising: a center electrode extending along an axis; an insulator provided about the outer peripheral surface of the center electrode; a metal shell provided about the outer peripheral surface of the insulator; a noble metal tip provided at the leading end portion of the center electrode; one end of the ground electrode fixed at the leading end of the metal shell, and the other end of the ground electrode forming a gap with the leading end of the noble metal tip; a stopper preventing the noble metal tip from moving relative to the central electrode; a molten portion formed by irradiating laser or electron beam; and a closed space formed between the basal portion of the noble metal tip and the center electrode. The molten portion welds the center electrode and a part of the basal portion of the noble metal tip.10-14-2010
20130214670SPARK PLUG - A spark plug (08-22-2013
20100277049SPARK PLUG - A spark plug has a central electrode and a plurality of peripheral electrodes. The central electrode has a proximal portion and a distal portion. The distal portion of the central electrode has a circular cross-section with a longitudinal axis and terminates in a distal end. Each peripheral electrode has a lower portion and an upper portion. Each upper portion has a distal-most point. Each distal-most point is disposed in a central plane within which the longitudinal axis of the distal portion of the central electrode is wholly disposed. The cross-section of each upper portion taken along its central plane defines a convex outer side and a non-convex inner side. Each convex outer side has a curved surface which is tangent to a plurality of tangent planes, all of which intersect the longitudinal axis of the distal portion of the central electrode at points at or above the distal end of the distal point of the central electrode.11-04-2010
20100225222Flexible spark plug - A spark plug designed for fitting in tight spaces of an engine compartment is disclosed. The spark plug has a conductive terminal attached to one end of a flexible central electrode and has a ceramic insulator partially encasing the flexible central electrode. The part of the flexible central electrode between the ceramic insulator and the conductive terminal is encased in a flexible insulator. The flexible part of the central electrode may be bent away from the axis of the ceramic insulator accommodating both installation and servicing of the spark plug in tight spaces.09-09-2010
20090066210Spark Plug - A spark plug comprising a housing, a ceramic insulator and a sleeve is provided. The housing has an inner cavity while the ceramic insulator encloses a central electrode. The ceramic insulator is disposed inside the inner cavity and maintain from the housing with a gap. The sleeve is provided enclosing an inner wall of the housing and corresponds to an opening of the inner cavity. The level of an edge surface of the housing corresponding to the opening of the inner cavity is disposed higher than the level of an edge surface of the central electrode, and the level of the center electrode is also higher than the level of the edge surface of the ceramic insulator.03-12-2009
20110175514SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug without any noble metal chip on a ground electrode and capable of enhancing the ignition property, prolonging the life and ensuring a sufficiently high strength of the ground electrode is provided. The spark plug 07-21-2011
20110210659SPARK PLUG AND MANUFACTURING METHOD THEREFOR - Provided are a spark plug in which the occurrence of spark blowout or the like is restrained for improvement of ignition performance, and a method of manufacturing the spark plug. A ground electrode 09-01-2011
20110057554Ignition Device Having a Reflowed Firing Tip and Method of Construction - A sparkplug having ground and/or center electrodes that include a firing tip formed by reflowing of an end of wire having an opposite end carried by a feed mechanism. The present invention also includes methods of manufacturing an ignition device and electrodes therefore having a firing tip, including providing a metal electrode having a firing tip region; providing a wire having a free end and another end carried by a feed mechanism; and reflowing the free end to form a firing tip.03-10-2011
20120194056ELECTRODE MATERIAL FOR A SPARK PLUG - An electrode material that may be used in spark plugs and other ignition devices including industrial plugs, aviation igniters, glow plugs, or any other device that is used to ignite an air/fuel mixture in an engine. The electrode material is a metal composite and includes a particulate component embedded or dispersed within a matrix component such that the metal composite has a multi-phase microstructure. In one embodiment, the metal composite includes a matrix component that includes a precious metal and makes up about 2-80% wt of the overall composite and a particulate component that includes a ruthenium-based material and makes up about 20-98% wt of the overall composite.08-02-2012
20100301732STRUCTURE OF SPARK PLUG - Disclosed is a park plug, which has a conductive plate constituting a side electrode, and a slot is defined through the conductive plate, so that no dead zone is present around the spark plug for a fuel injection system and thereby achieving more complete combustion. The spark plug is threadingly fit into a combustion chamber of an engine and employs a high-voltage electric current to generate spark for ignition and thus enabling combustion and explosion to generate power for driving movement of cylinders. Thus, by providing a slot in the conductive plate of the side electrode, a mixture gas of fuel and air inside the combustion chamber can be completely spread around the spark plug to thereby enhance combustion efficiency. This not only reduces fuel consumption and enhances horsepower, but also eliminates jamming of an injection engine due to less carbon deposition.12-02-2010
20110248620SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - Provided is a spark plug which allows a predetermined resistance to be imparted to a resistor with restraint of variation in resistance of the resistor and in turn, enables enhancement of yield. The spark plug includes a ceramic insulator having an axial hole extending in the direction of an axis CL10-13-2011
20110121712SPARK PLUG WITH VOLUME-STABLE ELECTRODE MATERIAL - A spark plug having one or more electrodes at least partially fabricated from an aluminum-containing Ni-based alloy. The alloy is a volume-stable alloy that includes a Ni05-26-2011
20110121711Spark plug for an internal combustion engine - A spark plug for an internal combustion engine, having an insulator including an insulator shoulder designed for mounting a tensioning nut or a housing and having a first outer diameter, an insulator head which is situated farther from the combustion chamber and adjoins the insulator shoulder, and which has a second outer diameter which is smaller than the first outer diameter, and a continuous cavity, a composition including a first contact composition, a second contact composition, and a composition resistor situated between the first contact composition and the second contact composition, a connecting pin which contacts the first contact composition, a center electrode which contacts the second contact composition, and a ground electrode. The connecting pin, the composition, and the center electrode are situated in the cavity, and the composition resistor has a third outer diameter, and a ratio of the third outer diameter to the second outer diameter is between 0.35 and 0.7.05-26-2011
20110241521SPARK PLUG ELECTRODE AND METHOD OF MANUFACTURE - A spark plug for an internal combustion engine includes a housing having a distal end, a proximal end, and an outer periphery extending therebetween. A mounting thread formed on the outer periphery at the proximal end of the housing secures the spark plug to the engine. A center electrode fixedly secured along a central axis of the housing has a first end extending outwardly from the proximal end of the housing. A ground electrode secured to the proximal end of the housing has an electrode tip at a first distance from the center electrode. The electrode tip has a central aperture extending through the ground electrode from an upper surface to a lower surface. A protruding edge circumscribes the aperture and extends a second distance from the upper surface of the electrode tip towards the center electrode.10-06-2011
20100133978Spark Plug For Internal Combustion Engine - A spark plug 06-03-2010
20100133977SPARK PLUG AND MANUFACTURING METHOD THEREOF - A ground electrode and a metal shell are joined by welding or the like while an entire end face of a base of the ground electrode is brought into contact with a front end constituent face of the metal shell. The ground electrode has an extending portion extending forward in an axial (O) direction of the ground electrode. A front end portion faces a noble metal tip joined to a front end portion of the center electrode through a bending portion and forms a spark discharge gap (G) therebetween. A gap (a clearance) having a sufficient space to accommodate a virtual sphere (Q) with a radius of 1.2 mm is provided so that the virtual sphere (Q) being in contact with an inner face of the bending portion of the ground electrode is neither in contact with a center electrode nor an insulator.06-03-2010
20100133976Maxx fire spark plug - A spark plug for vehicle may include a ground electrode, and a center electrode for cooperating with the ground electrode. The center electrode may include a spline member and the ground electrode may include an inward extending projection member. The spline member and the inward extending projection member may cooperate to generate a spark for the vehicle, and the spline member may be a male spline member. The center electrode may include a plurality of spline members spaced around the periphery of the central electrode, and the ground electrode may include a plurality of inward extending projection members spaced around the periphery of the ground electrode. The ground electrode may include a cylinder.06-03-2010
20110025186SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug in which a front end portion of a ground electrode is positioned outside of a virtual outer circumferential face that is formed by extending a front and outer circumferential face of a center electrode in the axis direction, and positioned on a front end side in the axis direction with respect to a virtual face including a front end face of the center electrode. Further, the equation 1.1≦b/a≦1.6 is satisfied, where “a” (mm) represents a first minimal distance between the front end portion of the center electrode and the front end portion of the ground electrode and, where “b” (mm) represents a second minimal distance between the front end portion of a ceramic insulator and the front end portion of the ground electrode.02-03-2011
20110241524SPARK PLUG AND MANUFACTURING METHOD THEREOF - There is provided a spark plug 10-06-2011
20090066211Method for manufacturing a spark plug having a laterally oriented ground electrode - A method for manufacturing a spark plug having a central electrode and a ground electrode, the central electrode and the ground electrode being spaced apart from each other and a first planar electrode face being formed on the central electrode and a second planar electrode face being formed on the ground electrode by a separative manufacturing method.03-12-2009
20110037373PLASMA JET SPARK PLUG - A plasma jet spark plug comprising: 02-17-2011
20110241523PLASMA JET IGNITION PLUG - A plasma jet ignition plug having high ignition performance and high durability. The plasma jet ignition plug comprises a center electrode wherein at least a front end portion including a front end surface of the center electrode contains an oxide of at least one of the rare earth elements in a total amount of 0.5% by mass to 10% by mass inclusive and tungsten (W) in an amount of 90% by mass or greater, or contains iridium (Ir) in an amount of 0.3% by mass to 3% by mass inclusive and W in an amount of 97% by mass or greater.10-06-2011
20110115361SPARK PLUG - A spark plug include an insulator, a central electrode, which is in the form of a bar received in the insulator, a metal case, which surrounds the insulator and is grounded, and a ground elbow fixed to the metal case. The central electrode includes a discharge terminal exposed outside the insulator and defining an extension line as an imaginary line extending from the discharge terminal along a central axis of the central electrode. The ground elbow has a connection end and an opposite, sharp-tip-like receiving end. The connection end is fixed to the metal case. The receiving end is set close to but spaced from the discharge terminal and is locate by one side of the extension line.05-19-2011
20090051259SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A ground electrode (02-26-2009
20090033195SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING THE SAME - A spark plug for an internal combustion engine, includes: a cylindrical insulating body; a center electrode; a cylindrical metal shell; and a ground electrode, as defined herein, wherein the noble metal tip is bonded to the ground electrode via a molten bond, and when viewed in a cross-section including a center axis of the noble metal tip along a longitudinal direction of the ground electrode, a sum of a cross-sectional area of a base-end-side molten bond (A) positioned at a base end side of the ground electrode and a cross-sectional area of a front-end-side molten bond (B) positioned at a front end side of the ground electrode is equal to or greater than 4 mm02-05-2009
20110127900ELECTRODE MATERIAL FOR A SPARK PLUG - A spark plug electrode material that may be used in spark plugs and other ignition devices including industrial plugs, aviation igniters, glow plugs, or any other device that is used to ignite an air/fuel mixture in an engine. According to an exemplary embodiment, the electrode material includes a refractory metal (for example, tungsten (W), molybdenum (Mo), rhenium (Re), ruthenium (Ru) and/or chromium (Cr)) and a precious metal (for example, rhodium (Rh), platinum (Pt), palladium (Pd) and/or iridium (Ir)), where the refractory metal is present in an amount that is greater than that of the precious metal. This includes, but is certainly not limited to, electrode materials including tungsten-based alloys such as W—Rh and ruthenium-based alloys such as Ru—Rh. Other combinations and embodiments are also possible.06-02-2011
20110241522SPARK IGNITION DEVICE FOR AN INTERNAL COMBUSTION ENGINE, METAL SHELL THEREFOR AND METHODS OF CONSTRUCTION THEREOF - A spark ignition device, metal shell, and methods of construction are provided. The spark ignition device has a ceramic insulator extending along a longitudinal axis and a metal shell. The metal shell extends along the longitudinal axis to a distal end. A center electrode is received in the ceramic insulator and extends along the longitudinal axis. A ground electrode has an attachment end fixed by a weld joint to the distal end of the shell and a free end extending from the distal end to provide a spark gap. The weld joint includes a resistance weld joint and a laser weld joint, which in combination inhibit material expulsion; provide a reliable, strong attachment of the ground electrode to the shell; provide an improved heat transfer path between the ground electrode and the shell, and facilitate repeatable and accurate positioning of the ground electrode to the shell.10-06-2011
20110175515SPARK PLUG - It is an object of the present invention to provide a spark plug that can be produced at low cost and secure compatibility between ignition performance and durability. The spark plug according to the present invention includes a center electrode and a ground electrode having an inner surface facing the center electrode, characterized in that; the ground electrode has a protrusion and a hole; the protrusion protrudes from the inner surface by a protruding length A of 0.4 to 1 mm and has a first straight portion with a projected first straight portion area S07-21-2011
20090322198METHOD OF PRODUCING SPARK PLUG AND SPARK PLUG PRODUCED BY THE METHOD - For producing a spark plug that has a high dimensional accuracy in the spark gap, a method is disclosed which comprises (a) preparing a semi-finished spark plug unit (12-31-2009
20110101844SPARK PLUG HAVING PRESSURE SENSOR - A spark plug is intended for combustion engines and comprises a metal housing having a ground electrode disposed at the front and a thread having a rear sealing surface for installation in the combustion engine. The spark plug in particular includes a pressure sensor disposed laterally in the housing for determining a combustion chamber pressure and a ceramic body having a center electrode. The ceramic body is disposed in the housing next to the pressure sensor and acting as an electric insulator. As viewed from the combustion chamber, the ceramic body defines a front clamping shoulder and a rear stop for clamping the ceramic body into the housing. The outside diameter of the ceramic body gradually decreases in the region of the thread located between the rear sealing surface and the front clamping shoulder.05-05-2011
20100244651SPARK IGNITION DEVICE WITH BRIDGING GROUND ELECTRODE AND METHOD OF CONSTRUCTION THEREOF - A spark ignition device and method of construction is provided. The device includes a ceramic insulator and a metal shell surrounding at least a portion of the ceramic insulator. The metal shell extends along a central axis between an upper terminal end and a lower fastening end. The fastening end has a pair of projections diametrically opposite one another extending axially to free ends. A center electrode assembly is received at least in part in the ceramic insulator. In addition, the device includes an elongate ground electrode having opposite sides extending along a length of the ground electrode between opposite ends. The ground electrode has opposite faces with a sparking surface attached to one of the faces, wherein the face with the sparking surface attached thereto is sunk axially into the free ends of the projections with at least a portion of the opposite sides being surrounded by the projections.09-30-2010
20110043093SPARK PLUG - A spark plug (02-24-2011
20110025185SPARK PLUG - A spark member (02-03-2011
20110254429PLASMA JET SPARK PLUG - A plasma jet spark plug capable of preventing a channeling progress and having excellent heat conduction. The plasma jet spark plug comprised of: a ceramic insulator having a small diameter portion which assumes a linear shape in an axial direction, and a center electrode has an outer diameter increasing in the order of a frontmost portion, a step portion, a front end portion and a body portion.10-20-2011
20080272683IGNITER - An igniter for an internal combustion engine, the igniter comprising: a center electrode; an insulator disposed about the center electrode; a ground shield disposed about the insulator, the insulator having a tip portion extending past an end portion of the ground shield and a tip portion of the center electrode extending through and away from the tip portion of the insulator; and a spark gap disposed between the tip portion of the center electrode and the end portion of the ground shield.11-06-2008
20120169206RUTHENIUM-BASED ELECTRODE MATERIAL FOR A SPARK PLUG - A ruthenium-based electrode material for use with a spark plug. The electrode material comprises ruthenium (Ru) and a precious metal. The ruthenium (Ru) is the single largest constituent of the electrode material on a wt % basis. The electrode material may have a density that is less than or equal to about 15.5 g/cm07-05-2012
20080203882SPARK PLUG AND METHOD FOR MANUFACTURING THE SAME - A method for manufacturing a spark plug and a spark plug manufactured by the method in which a gasket used for securing the air-tightness when mounting the spark plug on an internal-combustion engine is prevented from falling out from the metal shell with a simple step.08-28-2008
20100320893SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A spark plug and manufacturing method. The spark plug (12-23-2010
20110163653SPARK PLUG - A spark plug includes a cylindrical metal shell; a cylindrical insulator that is held in the metal shell; a center electrode; and a ground electrode that comprises a ground electrode main body part and a noble metal tip, a spark discharge gap being formed between the leading end of the center electrode and the noble metal tip wherein at least a portion of the ground electrode main body part, to which the noble metal tip is joined, is made of Ni alloy containing 12 to 35 mass % of Cr, 7 mass % or less of Fe, 0.5 to 5 mass % of Al, 0.3 to 5 mass % of Si and 50 mass % or more of the balance, and wherein the joined portion and the noble metal tip are joined by laser welding or electron beam welding.07-07-2011
20100283373SPARK PLUG - A corner of a distal end of a ground-electrode-side noble metal tip of a spark plug is taken as a first corner; a corner of a leading end of a center-electrode-side noble metal tip is taken as a second corner; a corner formed at a starting point where a diameter of the center electrode is reduced is taken as a third corner; a corner of the ground electrode is taken as a fourth corner; a corner closest to the third corner of the corners on the distal end of the ground-electrode-side noble metal tip is taken as a fifth corner; a length of a virtual flying spark path defined between the first corner and the second corner is taken as L11-11-2010
20110089807SPARK PLUG - The ignitability of a spark plug configured without a noble metal for a center electrode and a ground electrode is improved. The spark plug comprises a center electrode, an insulator, a metal shell, and a ground electrode including a discharge surface. The ground electrode forms a spark gap between the discharge surface and the center electrode. The center electrode and the ground electrode both do not include a noble metal. The ground electrode comprises a proximal end portion combined with the metal shell and positioned above, the discharge surface and a distal end portion including the discharge surface and positioned below the proximal end portion while continued from the proximal end portion. A width Da of the center electrode viewed from a first direction and a width Db of the proximal end portion viewed from the first direction satisfy Db/Da≦0.92. The first direction is perpendicular to the axial direction and directing from the proximal end portion to the center electrode.04-21-2011
20120146484SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING SPARK PLUG - A generation of a stress corrosion cracking is prevented in a middle section. The spark plug 06-14-2012
20120146483STRUCTURE OF SPARK PLUG DESIGNED TO ENSURE IMPROVED PRODUCTIVITY - A spark plug for use in an internal combustion engine. The spark plug is equipped with a metal shell, a ground electrode joined to the metal shell, and a center electrode disposed in the metal shell.06-14-2012
20100213812SPARK PLUG FOR INTERNAL COMBUSTION ENGINES AND METHOD FOR MANUFACTURING THE SPARK PLUG - A spark plug for internal-combustion engines equipped with a center electrode and a ground electrode is provided. In the spark plug, the ground electrode is fixed to a mount fitting, while the ground electrode has a convex portion. The convex portion is made of a part of base materials of the ground electrode where the part is facing the center electrode, and is projected toward the center electrode. The convex portion has a fusion solidification part made of precious metal materials and a part of the base materials melted together and solidified at least on part of an electric discharge surface facing the center electrode.08-26-2010
20110148276SPARK PLUG - Separation of a noble metal tip is prevented and wear resistance is enhanced, while the increase in manufacturing cost is suppressed. A spark plug 06-23-2011
20110148275SPARK PLUG AND PROCESS FOR PRODUCING SAME - There are provided a spark plug in which a plating film applied to a ground electrode can be relatively easily removed, without cost increase, to prevent deterioration in ignition performance, and a process for producing the spark plug. A spark plug 06-23-2011
20110148274Spark Plug for a Gas-Operated Internal Combustion Engine - The invention relates to a spark plug for a gas-fired internal combustion engine, and Includes a metallic body, with an insulator fastened in the body. A central electrode, leads through the insulator and includes a protruding end of a precious metal alloy. An annular ground electrode is fastened to the body and surrounds the end of the central electrode which, at the inside thereof facing the central electrode is provided with a precious metal or with a precious metal alloy. The mutually facing surfaces of the central electrode and ground electrode formed by the precious metal or the precious metal alloy are coaxially disposed cylinder surfaces. A cap is provided and attached to the body and which, after installation of the spark plug into a combustion chamber of the internal combustion engine, shields the central electrode and the ground electrode from the combustion chamber. Together with the body of the spark plug, the central electrode forms an ante-chamber, in which the central electrode and the ground electrode are disposed. The cap having at least one opening, which enables a gas exchange between the ante-chamber and the space outside of the ante-chamber. According to the invention, a deviation of the cylinder surfaces from the ideal cylinder geometry is less than +−20 μm, and a deviation of the positions of the axes of the cylinder surfaces from their ideal coaxial position is less than +−50 μm.06-23-2011
20100052497CERAMIC ELECTRODE, IGNITION DEVICE THEREWITH AND METHODS OF CONSTRUCTION THEREOF - A spark plug, a center electrode therefore and method of construction is provided. The spark plug has a generally annular ceramic insulator extending between a terminal end and a nose end. A conductive shell surrounds at least a portion of the ceramic insulator and a ground electrode having a ground electrode sparking surface is operatively attached to the shell. An elongate center electrode has a body extending between opposite ends, wherein the body is compacted and sintered of a conductive or semi-conductive ceramic material. One of the electrode ends provides a center electrode sparking surface to provide a spark gap between the center electrode sparking surface and the ground electrode sparking surface.03-04-2010
20110215704PLASMA JET SPARK PLUG - A plasma jet spark plug for igniting an air-fuel mixture in a conventional combustion device such as an internal combustion engine.09-08-2011
20110215703Pre-chamber spark plug - The invention relates to a pre-chamber spark plug with a housing which, at its forward end, comprises a pre-chamber with a plurality of openings, an insulator arranged in the housing, a center electrode which is surrounded by the insulator and supports an ignition electrode arranged in the pre-chamber which comprises a plurality of electrode arms, wherein the electrode arms each comprise a rear section which extends in a transverse direction in relation to the longitudinal direction of the center electrode and a forward section which extends along a pre-chamber wall and forms a spark gap between itself and the pre-chamber wall. It is provided according to the invention that the electrode arms are embedded in the center electrode and project from a lateral surface of the center electrode. Furthermore, the invention relates to a method according to the invention.09-08-2011
20110215702SPARK PLUG - A spark plug having an electrode, an insulator, a metallic shell, a main ground electrode, and at least two auxiliary ground electrodes.09-08-2011
20100026159IGNITION PLUG - Provided is an ignition plug used for an internal-combustion engine. The ignition plug includes: a center electrode; an insulator disposed outside the center electrode; a metal housing disposed outside the insulator; a ground electrode having an end connected to the metal housing and the other end facing the center electrode; and an electrode tip fixed to one or more of the center electrode and the ground electrode. The electrode tip is made of an alloy of iridium Ir, hafnium Hf, and niobium Nb. Therefore, the ignition plug with the low-cost iridium can have high resistance to prevent an iridium element from oxidizing and vaporizing in high speed driving conditions.02-04-2010
20100019643Sparkplug, in Particular for High Combustion Chamber Pressures - A spark plug has a center electrode disposed inside an insulator, and a housing that at least locally surrounds the insulator, and a conductive planar element that is electrically contacted to the housing is disposed on the insulator.01-28-2010
20100052499COMPOSITE CERAMIC ELECTRODE, IGNITION DEVICE THEREWITH AND METHODS OF CONSTRUCTION THEREOF - A spark plug, center electrode and method of construction is provided. The spark plug has a generally annular ceramic insulator and a conductive shell surrounding at least a portion of the ceramic insulator. A ground electrode is operatively attached to the shell, with the ground electrode having a ground electrode sparking surface. A center electrode has an elongate body with a center electrode sparking surface. The center electrode sparking surface and the ground electrode sparking surface provide a spark gap. The center electrode body is constructed of a composite material including at least one ceramic material.03-04-2010
20090179544Spark Plug With Multi-Layer Firing Tip - A spark plug having a multilayer firing tip that minimizes the amount of precious metal used and a method of assembling a spark plug with a multilayer firing tip. The firing tip includes a discharge end and a weld end, with the weld end being connected to a center electrode, and more specifically to a base electrode on the center electrode. The weld end has a coefficient of thermal expansion, which is not between the values for the coefficients of thermal expansion for the discharge end and the base electrode. More specifically, the weld end has a coefficient of thermal expansion which is greater than the coefficients of thermal expansion for the discharge end and base electrode. The weld end is formed from Nickel and Chromium with a limited amount of additional elements. The spark plug is assembled by providing a first elongated material formed from the material used for the discharge end and a second elongated material formed from a material used for the weld end. The two materials are then joined to form a single joined material and are severed to create a firing tip. The firing tip is welded to the center electrode of the spark plug and more specifically, the base electrode.07-16-2009
20110304256SPARK PLUG AND MANUFACTURING METHOD THEREOF - A spark plug including a center electrode; an insulator; and a metal shell, the metal shell including: a tool engaging section; a body section; and a groove section formed between the tool engaging section and the body section, and having bulges which bulge in an outer peripheral direction and in an inner peripheral direction. When a portion of the groove section having a largest outer diameter is a first section, a thinnest portion from the first section to the body section is a second section, and a portion having a thickness that is the same as that of the first section is a third section, a relation between a thickness A of the second section and a radius of curvature R of an outer surface of the metal shell that continues from the second section to the third section satisfies R×A≧0.20 mm12-15-2011
20100194258SPARK PLUG ELECTRODE PRODUCED FROM AN IMPROVED ELECTRODE MATERIAL - A spark plug electrode, which is produced from an electrode material containing nickel as base material, 0.5 to 3 atom % of silicon, and at least 6 atom % of aluminum.08-05-2010
20120306346SPARK PLUG - A spark plug having a metal shell, the metal shell having a tool engagement portion, a trunk portion and a cylindrical groove disposed between the tool engagement portion and the trunk portion, wherein the following relationship is satisfied:12-06-2012
20120306345Spark Plug - A spark plug is provided having a resistor. The resistor is made from resistor glass material containing an alkali free barium alumino-silicate glass mixed with mullite. In one embodiment, the resistor is a 15 to 30 wt % alkali free barium alumino-silicate glass and 10 to 25 wt % mullite. The resistor material provides for a greater processing kiln temperature range with reduced resistor variability and improved durability performance.12-06-2012
20120038262COMPOSITE CERAMIC ELECTRODE AND IGNITION DEVICE THEREWITH - A spark plug, center electrode and method of construction is provided. The spark plug has a generally annular ceramic insulator and a conductive shell surrounding at least a portion of the ceramic insulator. A ground electrode is operatively attached to the shell, with the ground electrode having a ground electrode sparking surface. A center electrode has an elongate body with a center electrode sparking surface. The center electrode sparking surface and the ground electrode sparking surface provide a spark gap. The center electrode body is constructed of a composite material including at least one ceramic material.02-16-2012
20120112620NON-THERMAL PLASMA IGNITION ARC SUPPRESSION - An igniter (05-10-2012
20100096968SPARK PLUG - A spark plug in which the rising of a ground electrode is more reliably restrained. The spark plug includes a ground electrode having a core portion extending from a proximal end section toward a distal end section via a bent section, a heat transfer portion extending from the proximal end section toward the distal end section via the bent section, and an external layer located externally of the core portion and the heat transfer portion and extending from the proximal end section to the distal end section via the bent section. As viewed on a section of the ground electrode taken orthogonally to a direction along which the ground electrode extends, at least at an intermediate position of the bent section with respect to the direction, the center of the core portion is offset toward a center electrode from the center of the heat transfer portion.04-22-2010
20110316408SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING SAME - An objective is to provide a spark plug in which a ground electrode has a protrusion formed from the same material as that used to form the ground electrode and the heat transfer performance of the protrusion is improved to thereby improve erosion resistance. A spark plug 12-29-2011
20120001533SPARK PLUG AND ITS MANUFACTURING METHOD - A spark plug includes an insulator, a center electrode, a metal shell, a ground electrode, and a noble metal tip joined to at least one of the two electrodes. The noble metal tip is joined to the electrode via a melt portion formed by using a laser or electron beam from a side surface of the noble metal tip. In a predetermined section, including a central axis of the noble metal tip, ¾ or more of one end face of the noble metal tip is joined to the electrode. When the thickness of the melt portion is taken to be TX (mm), and the length in a direction of irradiation with the laser beam is taken to be LX (mm), TX and LX satisfy 1.5≦LX/TX, and an angle αX or angle αY, formed by two predetermined straight lines, satisfies −15≦αX (αY)≦25.01-05-2012
20120007489SPARK PLUG - A spark plug exhibits a satisfactory withstand voltage characteristic and sufficient mechanical strength in a high temperature environment exceeding 700° C. The spark plug has a center electrode, an insulator, and a ground electrode, characterized in that the insulator is formed of an alumina-based sintered material containing an Si component, a Group 2 element (2A) component, and a rare earth element (RE) component; that the alumina-based sintered material has an RE-β-alumina crystal phase; and that the mean crystal grain size D01-12-2012
20120013241SPARK PLUG - The object of the invention is to provide a spark plug including a central electrode and/or a ground electrode, which can suppress generation of corrosion-like generated foreign substances while maintaining high thermal conductivity and high strength.01-19-2012
20120013239MULTI-SPARK SPARK PLUGS AND METHODS OF MANUFACTURE - In various embodiments, a spark plug includes an electrically conductive body disposed around an insulator, a tip of the insulator protruding from the body, a generally radially disposed annular groove formed by the insulator tip, a center electrode disposed within the insulator, a tip of the center electrode protruding from the insulator tip, and an annular auxiliary electrode disposed within the annular groove, the auxiliary electrode having a center portion thicker than an edge portion thereof. A longitudinal length of the auxiliary electrode may be greater than a radial thickness of the auxiliary electrode.01-19-2012
20120013240Ceramic Electrode, Ignition Device Therewith And Methods Of Construction Thereof - A spark plug, a center electrode therefore and method of construction is provided. The spark plug has a generally annular ceramic insulator extending between a terminal end and a nose end. A conductive shell surrounds at least a portion of the ceramic insulator and a ground electrode having a ground electrode sparking surface is operatively attached to the shell. An elongate center electrode has a body extending between opposite ends, wherein the body is compacted and sintered of a conductive or semi-conductive ceramic material. One of the electrode ends provides a center electrode sparking surface to provide a spark gap between the center electrode sparking surface and the ground electrode sparking surface.01-19-2012
20120112621SPARK PLUG WITH UNDERCUT INSULATOR AND ONE PIECE SHELL - A spark plug for an internal combustion engine, the spark plug having: an elongated center electrode having a center electrode tip at one end and a terminal proximate the other end; an insulator substantially surrounding the center electrode, the insulator having a channel formed in an exterior surface of the insulator; an outer shell surrounding the insulator having: a jamb nut portion with a distal end extending thereform, the distal end being aligned with the channel such that the distal end of the outer shell is received within and engages the channel; a motor seat portion proximate to the jamb nut portion; and a threaded portion proximate to the motor seat portion, wherein the jamb nut portion, the motor seat portion, and the threaded portion are all integrally formed with the outer shell as a single component.05-10-2012
20120112619SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A buried portion (05-10-2012
20120025690Spark plug and its method of production - The invention describes a spark plug, which comprises an inner conductor, an insulator enclosing the inner conductor, a spark plug body enclosing the insulator and two electrodes forming a spark gap. The first electrode is a center electrode connected to the inner conductor in an electrically conductive manner and the second electrode is a ground electrode connected to the spark plug body in an electrically conductive manner. At least one of the electrodes has a precious metal region, adjoining the spark gap and consisting predominantly of platinum, iridium or an alloy of both and containing additionally at least one brittle metal. The precious metal region consists of a base material predominantly containing platinum and/or iridium, which comprises a coating with a brittle metal, which is more brittle than the base material.02-02-2012
20120025692ELECTRODE MATERIAL FOR USE WITH A SPARK PLUG - A spark plug for an internal combustion engine has a center electrode, a ground electrode or both that includes an electrode material that is a Pt-based alloy. The electrode material may include platinum (Pt), at least one active element like aluminum (Al) or silicon (Si), and at least one high-melting point element such as ruthenium (Ru), iridium (Ir), tungsten (W), molybdenum (Mo), rhenium (Re), tantalum (Ta), niobium (Nb), chromium (Cr), or a combination thereof. In at least some of the disclosed alloys, the aluminum (Al) and/or silicon (Si) contributes to the formation of a thin protective oxide layer on a surface of the electrode material.02-02-2012
20120025691SPARK PLUG - Peeling resistance of a noble metal chip is improved by reducing a difference in the thermal stress generated between the noble metal chip and a ground electrode. A spark plug 02-02-2012
20120062098METHOD OF MANUFACTURING A SPARK PLUG - Provided is a manufacturing method for manufacturing a spark plug which produces a spark plug which mitigates misfire and improves gas mileage, peak engine performance, horsepower, and increases the RPM range of the host vehicle. The improved performance of the spark plug is, at least in part, attributable to the spacing between an electrode body and an electrode cage. In particular, the electrode cage extends over the electrode body such that the arcuate members of the electrode cage are equidistantly spaced from the bulbous or spherical electrode body. The manufacturing method described herein results in a spark plug having the above-described configuration, while being formed and assembled at an economical cost.03-15-2012
20120153800SPARK PLUG - A spark plug includes a tubular metallic shell; a tubular insulator in the tubular metallic shell located at a front end of the metallic shell and having an axial hole extending in the axial direction; and a center electrode inserted into the axial hole. The center electrode has a space-forming portion which forms, in cooperation with a wall surface of the axial hole, an annular space open frontward in the axial direction, and a main body portion extending rearward from the rear end of the space-forming portion. The thickness of the insulator is 0.6 mm or less as measured on a cross section and contains the front end of the metallic shell. The axial distance between the boundary portion and the front end of the metallic shell is 0.4 mm or greater, where the boundary portion is formed between the space-forming portion and the main body portion.06-21-2012
20090134764SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD FOR PRODUCING THE SPARK PLUG - A spark plug including: a ground electrode including a thick portion provided on a base end side, a thin portion provided on a distal end side, and a stepped portion provided on an inner peripheral surface between the thick portion and the thin portion; a noble metal tip partially embedded in an inner peripheral surface of the thin portion; and a bulge portion provided on the inner peripheral surface of the thin portion between the stepped portion and the noble metal tip. When viewed from a side surface of the ground electrode, a relationship [a protruding height of the noble metal tip from the inner peripheral surface of the thin portion]≧[a protruding height of the bulge portion from the inner peripheral surface of the thin portion].05-28-2009
20100289398METHOD FOR PRODUCING SPARK PLUG AND SPARK PLUG - A spark plug (11-18-2010
20100289397SPARK PLUG FOR INTERNAL-COMBUSTION ENGINE AND METHOD FOR MANUFACTURING THE SAME - A spark plug for an internal-combustion engine comprises an attachment fitting 11-18-2010
20120126683SPARK PLUG - A spark plug exhibits excellent load life performance even when the resistor thereof has been thermally compacted at slightly varied heating temperatures. The spark plug includes an insulator having an axial hole extending therethrough along the axial direction; a center electrode inserted into a front end portion of the axial hole; a terminal electrode inserted into a rear end portion of the axial hole; a resistor disposed in the axial hole to be located between the center electrode and the terminal electrode, and containing at least an electrically conductive material and glass. The resistor contains 15.0 or more mass % of SiO05-24-2012
20120133264SPARK PLUG WITH FIRING END HAVING DOWNWARD EXTENDING TINES - A spark plug includes a body and a center electrode. The body includes a first end, a second end, an insulating portion and a shell portion. The shell portion includes an exterior threaded section, a nut section below the threaded section, an electrically conductive, axially elongated firing ring above the threaded section and terminating at an upper surface. The center electrode extends through the body and includes a terminal end and a firing end. The firing end extends beyond the second end of the body and includes a plurality of tines. Each tine includes a first section and a second section. The first section extends radially from the firing end. The second section extends axially toward the upper surface of the firing ring and terminates at a tip. The insulating portion electrically isolates the shell portion from the center electrode.05-31-2012
20120313503SPARK PLUG - A spark plug includes a ceramic insulator, a center electrode, a metallic shell, and a ground electrode. The center electrode has a shoulder portion at a forward end portion, which tapers forward with respect to the axial direction. A noble metal tip is joined to the forward end portion of the center electrode through a fusion zone. A spark discharge gap is formed between the noble metal tip and the ground electrode. The shortest distance between the fusion zone and a forward end surface of the noble metal tip is 0.8-1.2 mm. The outside diameter of the fusion zone as measured at a forward end of the fusion zone is smaller than that as measured at a rear end of the fusion zone. An acute angle θ1 formed by a straight line L1 and a straight line L2 satisfies the relational expression θ1≦72°.12-13-2012
20120161605SPARK PLUG - In a spark plug that has a small sized center electrode, enhancement of corruption-resisting property and heat-resisting property is promoted. The spark plug 06-28-2012
20120169207SPARK PLUG - A spark plug includes a ceramic insulator having an axial bore extending in the direction of an axis (CL07-05-2012
20100052498CERAMIC ELECTRODE AND IGNITION DEVICE THEREWITH - An electrode for an ignition device is made from a conductive ceramic of the form M03-04-2010
20120176022SPARK PLUG - To provide a spark plug excellent in the acid resistance and high-temperature withstand voltage characteristics. A spark plug 07-12-2012
20120176019SPARK PLUG - Problem is to enhance the welding strength when a projecting shape section is resistance-welded to a around electrode. A ground electrode 07-12-2012
20120176021SPARK PLUG FOR INTERNAL-COMBUSTION ENGINE - A spark plug that prevents a sharp increase in resistance of a resistor and materializes an excellent load life performance. The spark plug has a resistor formed by heat-sealing of a resistor composition that contains, at least, a conductive material and glass powder. The glass powder contains between 35.0 mol % and 69.8 mol % SiO07-12-2012
20120176020SPARK IGNITION DEVICE AND GROUND ELECTRODE THEREFOR AND METHODS OF CONSTRUCTION THEREOF - A spark ignition device has a ceramic insulator surrounded by a metal shell. The metal shell extends along a longitudinal axis to a distal end. A center electrode is received in the ceramic insulator and extends along the longitudinal axis. A ground electrode has an attachment end fixed by a weld joint to the distal end of the shell and a free end extending from the distal end to provide a spark gap. The weld joint includes a capacitive pulse discharge weld joint and a laser weld joint, which in combination inhibit material expulsion; provide a reliable, strong attachment of the ground electrode to the shell; provide an improved heat transfer path between the ground electrode and the shell, and facilitate repeatable and accurate positioning of the ground electrode to the shell. The weld joint includes a homogeneous mixture of the metal shell and the ground electrode.07-12-2012
20120074829ALLOYS FOR SPARK IGNITION DEVICE ELECTRODE SPARK SURFACES - An electrode for a spark ignition device, including a spark plug, which includes an alloy consisting essentially of, in weight percent, at least 15% Ni and the balance substantially Pt, and more particularly 15-45% Ni and the balance substantially Pt; 5-35% W, and the balance substantially Pd; and 5-15% Ni, 5-15% Pt, less than 10% Ir, and the balance substantially Pd.03-29-2012
20120074828SPARK PLUG AND MANUFACTURING METHOD THEREOF - A spark plug having improved durability having a ground electrode comprised of a ground electrode base member and a noble metal tip. A center axis of the noble metal tip slants in relation to the center axis of the ground electrode base member at angle θ which satisfies a relation 2°≦θ≦25°.03-29-2012
20120256531SPARK PLUG HAVING A HOLE FOR ADJUSTMENT - The invention relates to a spark plug, comprising a center electrode and a ground electrode, wherein the center electrode is arranged relative to the ground electrode in such a way that the spark gap extends between the ground electrode and the center electrode, wherein the spark gap is surrounded by a wall, wherein the wall has a recess or opening, which is designed in such a way that a feeler gauge can be inserted between the center electrode and the ground electrode.10-11-2012
20120256530SPARK PLUG - A spark plug including a center electrode and a ground electrode having a core portion and an outer layer covering the core portion, the core portion being formed from a material having a thermal conductivity higher than that of the outer layer. At least a portion in which thickness of the outer layer is 0.5 mm or less is present at a cross-section perpendicular to a direction in which the ground electrode is extended. Further, the composition of the electrode material forming the outer layer is as follows: Ni is 96 mass % or more, total of at least one kind selected from Y and rare earth elements is 0.05 mass % or more, Al is 0.5 mass % or less, and Si is 0.5 mass % or more and 1.5 mass % or less, where the total of Ni, Y, rare earth elements, Al, Si does not exceed 100 mass %.10-11-2012
20120187820SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A spark plug provides a reduced production cost by forming a tip from a metallic material containing Ni that exhibits excellent erosion resistance. The spark plug comprises an insulator having an axial hole extending in an axial direction; a center electrode inserted into the axial hole at a front end thereof; a metallic shell provided around the insulator; a ground electrode whose proximal end portion is fixed to a front end portion of the metallic shell; and a tip bonded to a distal end portion of the ground electrode such that a spark discharge gap is formed between the tip and a front end portion of the center electrode. The tip is formed of a metallic material containing Ni in an amount of 93 mass or more, and has a Vickers hardness of 163 Hv or less.07-26-2012
20100253204PLATINUM ALLOY FOR SPARK PLUG ELECTRODES AND SPARK PLUG HAVING A PLATINUM ALLOY ELECTRODE - A spark plug and an alloy for an electrode tip of a spark plug is disclosed herein. The spark plug having: an insulator shell; a center electrode inside the insulator shell such that one end of the center electrode protrudes from the insulator shell; a metal shell exterior to the insulator shell; a side ground electrode having one end coupled to the metal shell and the other end facing the protruding end of the center electrode to form a spark discharge gap between the center electrode and the side ground electrode; and an electrode tip secured to at least one of the side ground electrode or the center electrode, located at the spark discharge gap, the electrode tip comprising a platinum-based alloy comprising 20 to 35% by weight of palladium, from greater than 0 to 15% by weight iridium, and the balance of the alloy being platinum, all % by weight being based on the total weight of the alloy.10-07-2010
20100253203SPARK PLUG - An ignition part (10-07-2010
20120262049SPARK PLUG AND PROCESS FOR PRODUCING SPARK PLUG - A spark plug that is equipped with an insulator that has a stem portion on a front end side, a center electrode, and a main metal member that retains the insulator at an engaging projection portion, wherein an inner diameter D10-18-2012
20110037372SPARK IGNITION DEVICE WITH IN-BUILT COMBUSTION SENSOR - A spark plug having an integral gasoline combustion sensor is disclosed. The spark plug includes a center electrode assembly with a terminal stud at one end and a center electrode with a sparking surface at an opposite end; a generally tubular insulator surrounding the center electrode assembly; a shell surrounding the insulator and having along its length a turn-over on a first end, a barrel having an outer surface and barrel shoulder on a gasket flange thereof, a threaded portion, and a ground electrode; and a piezo sensor assembly located on the barrel shoulder proximate the outer surface of the barrel which includes a lower electrode contact, a piezo transducer, an upper electrode contact, an isolator having a convex upper surface, and an upper bushing which is attached to the barrel.02-17-2011
20120262048IRIDIUM ALLOY FOR SPARK PLUG ELECTRODES - A spark plug comprises a shell having a substantially cylindrical threaded portion for threadable engagement in a cylinder head of an internal combustion engine, an insulator disposed coaxially in the shell, a center electrode disposed coaxially in the insulator, a side ground electrode having a first end coupled to the shell and a second end facing an end of the center electrode to define a spark discharge gap therebetween, and an electrode tip portion secured to either the side ground electrode or the center electrode proximate the spark discharge gap. The tip portion is formed from an alloy comprising from about 60 to about 70 percent by weight iridium, from about 30 to about 35 percent by weight rhodium, from 0 to about 10 percent by weight nickel, from about 3500 to about 4500 parts per million tantalum, and from about 100 to about 200 parts per million zirconium.10-18-2012
20120326591SPARK PLUG FOR GASOLINE ENGINES - Described is a spark plug for gasoline engines with an elongated hollow body made of metal, said body having a forward end with an undercut formed by an interior annular shoulder of the body and a rear end, with an elongated ceramic insulator which is mounted in the body and has a rear end that projects beyond the rear end of the body and has a forward end beyond which the forward end of the body projects, with a center electrode which is inserted into the insulator, projects beyond the forward end thereof, and is connected to a metal connection pin in an electrically conductive manner, said connection pin projecting beyond the rear end of the insulator, and with at least one ground electrode which starts from the forward end of the body and is approached to the center electrode to an electrode distance (EA) to form a spark gap.12-27-2012
20120126682SPARK PLUG WITH CERAMIC ELECTRODE TIP - A spark plug (05-24-2012
20120080996SPARK PLUG - A task of this invention is to provide a spark plug that is superior in withstand voltage characteristics at high temperatures. A spark plug of this invention is equipped with a center electrode, an insulator, and a metal shell, and is characterized by that the insulator is equipped with an alumina-based sintered body containing silicon component (Si component), magnesium component (Mg component), at least one component of calcium component, strontium component, and barium component, and a rare earth element component (RE component), that a grain boundary phase of the alumina-based sintered body has a hexaaluminate crystal containing the RE component, that, in the alumina-based sintered body, the weight ratio of the RE component to the Mg component is 5.4≦RE oxide/MgO≦17.5, and that the content of an alkali metal component in terms of oxide in a spot having a diameter of 0.3 nm, where the hexaaluminate crystal or the hexaaluminate crystal and Si component in the grain boundary phase is present by TEM, ranges from 0.01 weight % to 20 weight %.04-05-2012
20120080995PLASMA JET IGNITION PLUG AND MANUFACTURING METHOD THEREOF - A plasma jet ignition plug that reliably prevents current leakage with restraint on variation in the position of a ground electrode relative to an insulator and on overheat of the ground electrode, for stable generation of plasma. The plug includes an insulator having an axial bore extending in the direction of an axis CL04-05-2012
20120319556SPARK PLUG AND METHOD FOR MANUFACTURING SPARK PLUG - The present invention relates to a spark plug having good combustible-gas ignitability even when the spark plug is downsized and to a method for high-yield manufacturing of a spark plug with good combustible-gas ignitability. There is provided according to one aspect of the present invention a spark plug 12-20-2012
20120139406IGNITER FOR IGNITING A FUEL/AIR MIXTURE IN AN INTERNAL COMBUSTION ENGINE USING A CORONA DISCHARGE - An igniter for igniting a fuel/air mixture using a corona discharge, generated by a high-frequency electric high voltage, in an internal combustion engine having one or more combustion chambers delimited by walls at ground potential, comprising an ignition electrode, which traverses in an electrically insulated manner one of the walls delimiting the particular combustion chamber and constitutes in cooperation with the walls of the combustion chamber, that are at ground potential, an electrical capacitance. Comprising a metallic or metallized outer member and an elongate passage extending through the outer member, through which extends the ignition electrode, and comprising an insulator which encloses the ignition electrode and insulates it electrically from the outer member, wherein the ignition electrode, the insulator, and the passage have a common longitudinal direction. The insulator is composed of a plurality of layers extending in the longitudinal direction, or is subdivided into a plurality of such layers.06-07-2012
20130009537IGNITER - An igniter for an internal combustion engine includes a center electrode, an insulator disposed about the center electrode, and a ground shield or a threaded portion disposed about the insulator, wherein the insulator includes a tip portion extending past an end portion of the ground shield and a tip portion of the center electrode extending through and away from the tip portion of the insulator. The igniter further includes a cap secured to the center electrode, wherein the cap extends past and covers a distal end of the tip portion of the center electrode and a distal end of the tip portion of the insulator. A spark gap is disposed between a peripheral edge of the cap and the end portion of the ground shield or threaded portion wherein the peripheral edge of the cap is spaced away from a surface of the tip portion of the insulator.01-10-2013
20130009535SPARK PLUG - A sparkplug includes an insulator having an axial hole, a center electrode of which a front end is placed further forwards than a front end of the insulator, and a shell. The center electrode has a shoulder portion and a main body portion and is made up of an outer layer and an inner layer. A front end face, which is connected to an outer circumferential surface of the insulator and the axial hole and slopes towards the rear end side, is formed at a front end portion of the insulator, and the front end of the insulator is placed further forwards than a boundary between the shoulder portion and the main body portion. A front end portion of the inner layer is placed further forwards than the boundary between the shoulder portion and the main body portion.01-10-2013
20130009536SPARK PLUG OF INTERNAL COMBUSTION ENGINE - A spark plug has a cylindrical housing case, a cylindrical glass insulator, a center electrode, and an earth electrode fixed to the cylindrical housing case. The earth electrode has a projected part which is projected toward the center electrode. The projected part has a facing surface which faces the center electrode and is most close to the center electrode in a spark discharge gap. This gap is formed between the center electrode and the earth electrode. The facing surface is covered with a plating layer. A base material, with which the earth electrode is made, is exposed on a side surface of the projected part around the facing surface of the projected part. The base material of the earth electrode is made of Ni alloy containing not less than 90 wt % Ni, and preferably, Ni within a range of 90 wt % to 98 wt %.01-10-2013
20130009538SPARK PLUG - A spark plug (01-10-2013
20130015755SPARK PLUG DESIGNED TO ENSURE DESIRED DEGREE OF IGNITABILITY OF FUELAANM INOHARA; TakayukiAACI Okazaki-shiAACO JPAAGP INOHARA; Takayuki Okazaki-shi JPAANM OKABE; ShinichiAACI Aichi-kenAACO JPAAGP OKABE; Shinichi Aichi-ken JPAANM AOCHI; TakanobuAACI Nishio-shiAACO JPAAGP AOCHI; Takanobu Nishio-shi JPAANM IWAMI; AtsushiAACI Kariya-shiAACO JPAAGP IWAMI; Atsushi Kariya-shi JPAANM SHIBATA; MasamichiAACI Toyota-shiAACO JPAAGP SHIBATA; Masamichi Toyota-shi JP - A spark plug for an internal combustion engine is provided which is equipped with a tip protrusion disposed on a top of a hollow cylindrical housing of the spark plug. The spark plug also includes a center electrode retained in a porcelain insulator disposed inside the housing and a ground electrode is joined to the housing so as to form a spark gap. The tip protrusion serves to direct a flow of gas to be ignited by a spark produced in the spark gap and is shaped to have a radial width extending in a radial direction of the housing and a circumferential width extending in a circumferential direction of the cylindrical housing. The radial width is greater than the circumferential width. This enhances the efficiency in guiding the flow of gas toward the spark gap.01-17-2013
20120242214PLASMA JET IGNITION PLUG - A plasma jet ignition plug including an insulating body having an axial hole therethrough. A center electrode is inserted into the axial hole. A cavity portion is defined by the insulating body and center electrode, with the leading end of the axial hole as an opening end. A decreasing diameter portion decreasing in diameter toward a leading end side is formed on the axial hole, the leading end of the decreasing diameter portion is positioned closer to the leading end side than the leading end face of the center electrode. The inside diameter of the leading end of the decreasing diameter portion is made smaller than the outside diameter of the leading end face of the center electrode.09-27-2012
20080238281PLASMA-JET SPARK PLUG - A plasma-jet spark plug comprising an insulator and a ground electrode which are disposed apart from each other in an axial direction (O) to prevent a damage of the insulator. The spark plug is capable of reducing an energy loss of the ejected plasma by defining a dimension of a clearance between the insulator and the ground electrode whereby deterioration of the ignitability of the plasma-jet spark plug is prevented. Clearance having a first clearance dimension “a” is formed between a front end of the insulator and the ground electrode. Since a volume S of a cavity formed at the front end side of the insulator is set to 10-02-2008
20130169141SPARK PLUG - In process of threadably fitting a metal shell having a surface formed with an Ni plated layer into a mounting hole, in a state where a gasket made of stainless steel is uncompressed while being interposed between a protrusion part and an opening periphery, a surface of the gasket is out of contact with another surface thereof. When the gasket is viewed on a cross section in a direction of an axial line O, the gasket contacts with the protrusion part at one point of a point X, the gasket contacts with the opening periphery at one point of a point Y, and the point Y is located outside of the point X in a radial direction. Further, the point Y is located inside of a maximum outer diameter Dz of a seating surface of the protrusion part in the radial direction.07-04-2013
20130175917SPARK PLUG AND METAL SHELL FOR SPARK PLUG - An adhesion of a nickel plating layer to a metal shell is improved, and an effect of improving a corrosion resistance by providing the nickel plating layer is sufficiently exerted. A spark plug 07-11-2013
20120248964PRE-CHAMBER SPARK PLUG INCLUDING A GAS THREAD CAVITY - A spark plug includes a housing, a center electrode, a ground electrode, and a pre-chamber cup. The housing is configured to thread into a spark-plug hole in an engine. The center electrode extends axially from a center of the housing. The ground electrode extends radially inward from the housing. The pre-chamber cup is attached to the housing. The housing defines a gas thread cavity that extends radially at least partially through the housing.10-04-2012
20110266940SPARK PLUG - A spark plug which provides reliable prevention of adhesion and accumulation of carbon on an insulator, includes a center electrode extending in the direction of an axis CL11-03-2011
20110221327PLASMA-JET SPARK PLUG AND IGNITION SYSTEM - A plasma jet ignition plug including an insulator having an axial hole extending therethrough in the direction of an axis CL09-15-2011
20130147338ELECTRODE BEAM WELDED SPARK PLUGS FOR INDUSTRIAL ELECTRODES - An industrial spark plug (06-13-2013
20120274200SPARK PLUG HAVING IMPROVED GROUND ELECTRODE ORIENTATION AND METHOD OF FORMING - A spark plug (11-01-2012
20130154468SPARK PLUG - A spark plug having a metallic shell covered with a nickel plating layer and having a groove portion formed between a tool engagement portion and a gas seal portion and having an orthogonal-to-axis sectional area of 36 mm06-20-2013
20130181597SPARK PLUG ELECTRODE, METHOD FOR PRODUCING SAME, SPARK PLUG, AND METHOD FOR PRODUCING SPARK PLUG - A spark plug is provided having at least one of a center electrode or a ground electrode. The electrode comprises: a core formed of a composite material containing a matrix metal, the matrix metal being copper or a metal containing copper as a main component, and carbon dispersed in the matrix metal in an amount of 10 to 80 vol. %, the carbon having a thermal conductivity higher than that of the matrix metal. The electrode also contains an outer shell which surrounds the core and which is formed of nickel or a metal containing nickel as a main component. The thus-produced electrode exhibits favorable thermal conductivity and good heat dissipation, by virtue of the small difference in thermal expansion coefficient-between the core and an outer shell. The spark plug including the above electrode exhibits excellent durability.07-18-2013
20130181596SPARK PLUG ELECTRODE, METHOD FOR PRODUCING SAME, SPARK PLUG, AND METHOD FOR PRODUCING SPARK PLUG - A spark plug includes at least one of a center electrode or a ground electrode that is produced by the steps of: mixing a matrix metal with carbon so that the carbon content of the resultant mixture is adjusted to 80 vol. % or less; subjecting the mixture to powder compacting or sintering, to thereby form a core; placing the core in a cup formed of nickel or a metal containing nickel as a main component; and subjecting the cup to cold working. The thus-produced electrode exhibits favorable thermal conductivity and good heat dissipation, by virtue of the small difference in thermal expansion coefficient between the core and an outer shell. The spark plug including the above electrode exhibits excellent durability.07-18-2013
20130187529Method of Producing A Spark Gap For An Electrode Support Using Sacrificial Material - A method of producing an electrode support for a spark plug is provided. The method includes attaching a chip to the electrode support. The chip includes a section of sacrificial material located between two sections of electrode material. The method includes substantially removing the section of sacrificial material from the chip to create a spark gap between the two sections of electrode material.07-25-2013
20120019120SPARK PLUG - A method for improving welding strength between a ground electrode and a noble metal tip on a spark plug. A fusion zone is formed along at least a portion of the boundary between the ground electrode and the noble metal tip through fusion of a portion of the ground electrode and a portion of the noble metal tip.01-26-2012
20130193834METHOD OF MANUFACTURING A SPARK PLUG HAVING ELECTRODE CAGE SECURED TO THE SHELL - Provided is a manufacturing method for manufacturing a spark plug which produces a spark plug which mitigates misfire and improves gas mileage, peak engine performance, horsepower, and increases the RPM range of the host vehicle. The improved performance of the spark plug is, at least in part, attributable to the spacing between an electrode body and an electrode cage. In particular, the electrode cage extends over the electrode body such that the arcuate members of the electrode cage are equidistantly spaced from the bulbous or spherical electrode body. The manufacturing method described herein results in a spark plug having the above-described configuration, while being formed and assembled at an economical cost.08-01-2013
20130200774SPARK PLUG AND MANUFACTURING METHOD THEREFOR - A spark plug includes a ceramic insulator having an axial hole formed in an axis direction of the spark plug, a center electrode inserted in a front side of the axial hole, a metal shell disposed around the ceramic insulator and a ground electrode joined to a front end portion of the metal shell, wherein the ground electrode has a cross-sectional area of 2.0 mm08-08-2013
20130200773SPARK PLUG - In a spark plug, a fusion zone where a ground electrode and a noble metal tip are fused together is formed in at least a portion of an interfacial region between the ground electrode and the noble metal tip. When the fusion zone is projected in the axial direction, the projected fusion zone overlaps 70% or more of the area of the noble metal tip. As viewed on a section which passes through the center of gravity of the noble metal tip and is perpendicular to the longitudinal direction of the ground electrode, the relational expression 1.3≦B/A is satisfied, where A is the greatest thickness of the fusion zone along the axial direction, and B is the length from a portion having the greatest thickness of the fusion zone to the inner end of the fusion zone.08-08-2013
20120299459SPARK PLUG AND METHOD OF MANUFACTURING SPARK PLUG - An ignition plug having a metallic shell with a through hole extending therethrough in an axial direction, an insulator fitted into the through hole of the metallic shell and having an axial hole extending in the axial direction, and a center electrode fitted into the axial hole of the insulator. The ignition plug further includes a cap member which covers a front end opening of the metallic shell, provided on a front end side thereof where the center electrode is disposed, to thereby form an ignition chamber at the front end portion of the metallic shell, and a ground electrode disposed within the ignition chamber and facing a circumferential surface of the center electrode directly or indirectly.11-29-2012
20120086326Method for Manufacturing a Spark Plug and Spark Plug Manufactured Accordingly - Method for manufacturing a spark plug comprising an inner conductor, an insulator enclosing the inner conductor, a spark plug body enclosing the insulator, and two electrodes, the first electrode being a center electrode connected to the inner conductor in an electrically conductive manner, and the second electrode being a ground electrode connected to the spark plug body in an electrically conductive manner, with a separately prefabricated precious metal component positioned on one of the electrodes and connected to the electrode by way of resistance welding, and subsequently affixed by way of laser or electron beam welding, so that the precious metal component extends like a heel beyond the electrode surface next to the precious metal component. The precious metal component, a ball, is shaped by stamping after resistance welding and before laser or electron beam welding, wherein at least one region of the ball protruding from the electrode surface (is reshaped.04-12-2012

Patent applications in class Particular electrode structure or spacing

Patent applications in all subclasses Particular electrode structure or spacing