Class / Patent application number | Description | Number of patent applications / Date published |
313144000 | With specific joint structure | 23 |
20080238284 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug ( | 10-02-2008 |
20090309476 | Method for Applying a Pin on an Elecrode Base Body - A method is described for applying a pin made of a spark-erosion-resistant material, in particular of noble metal, onto a electrode base element. In order to achieve a large pin surface exposed to spark erosion, without increased material outlay for the pin, the pin is placed with one end surface onto the electrode base element and welded to it. The welded-on pin is then, by application of a compressive force engaging at the exposed end surface of the pin and directed toward the electrode base element, upset to a larger diameter. | 12-17-2009 |
20110018422 | SPARK PLUG - When an insulator of a spark plug receives an external force in a bending direction perpendicular to an axis at a rear end side body portion, a position C where the insulator is supported by a crimping portion via a packing acts as a fulcrum, and a stress is applied between the position C and a position B where the insulator is supported by a ledge portion via a packing. When an insulator is designed in which the balance of size and modulus of section is adjusted so that τA which denotes a proof strength against bending between a rear end position A of the insulator and the position C and τB which denotes a proof strength against bending between the position B and the position C satisfy 0.71≦τA/τB≦1.27, cracks can be prevented. | 01-27-2011 |
20110043094 | SPARK PLUG, AND METHOD FOR MANUFACTURING THE SAME - A spark plug and method of manufacturing the same. The spark plug includes a tubular insulator holding a center electrode, and a tubular metallic shell holding the insulator. The insulator is inserted into the metallic shell from the rear end side thereof until a portion of the insulator engages the metallic shell. In this state, the circumferential edge of the rear end portion of the metallic shell is crimped, whereby the insulator is unitarily fixed to the metallic shell. A talc charged layer is formed in a clearance portion between the insulator and the metallic shell, and a wire packing is placed on a rear end portion of the talc charged layer for engaging the crimp portion. A portion of the talc charged layer is interposed between the wire packing and the rear trunk portion of the insulator. | 02-24-2011 |
20110181168 | SPARK PLUG - A spark plug is provided which can ensure gastightness between a metal shell and an insulator while preventing the cracking of the insulator. There is provided a spark plug in which a ledge portion | 07-28-2011 |
20110241525 | HIGH THREAD SPARK PLUG WITH UNDERCUT INSULATOR - 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 to another end of the center electrode; an insulator surrounding a portion of the center electrode, the insulator having a channel formed in an exterior surface of the insulator; and a jamb nut surrounding the insulator, the jamb nut being aligned with the channel such that a distal end of the jamb nut does not contact the insulator. | 10-06-2011 |
20120038263 | SPARK PLUG - A spark plug includes a center electrode extending in an axial direction; an insulator formed externally of the outer circumference of the center electrode; a metallic shell formed externally of the outer circumference of the insulator and having a ledge which supports the insulator; and a ground electrode joined to the metallic shell. The insulator has a support portion which faces the ledge. A “frontward direction” is defined as the direction parallel to the axial direction toward a spark portion formed between the center electrode and the ground electrode. The insulator has a diameter reduction portion whose outside diameter reduces along the frontward direction from the support portion, and a diameter increase portion whose outside diameter increases along the frontward direction from the front end of the diameter reduction portion. This restrains the generation of leak current while maintaining heat resistance of the spark plug. | 02-16-2012 |
20120062099 | SPARK PLUG - An object of the invention is to restrain separation of an electrode tip from a ground electrode or from a center electrode. A spark plug satisfies a condition 0.8≦A1/A2≦1.9, where, as viewed on a section which contains a center axis (O) of an electrode tip, A1 [Hv] is hardness of the electrode tip as measured outside a circle having a radius of 0.2 mm, with a boundary point (PA) on a surface of the spark plug between a fusion zone and the electrode tip serving as the center of the circle, and A2 [Hv] is hardness of the electrode tip as measured within the circle having a radius of 0.2 mm. | 03-15-2012 |
20120104927 | SPARK PLUG WITH UNDERCUT INSULATOR - 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; and an outer shell surrounding the insulator, the outer shell having a jamb nut portion and a distal end extending from the jamb nut portion, the distal end of the outer shell is aligned with the channel such that the distal end of the outer shell is received in and engages the channel of the outer shell. | 05-03-2012 |
20130221831 | LASER WELDED SPARK PLUG ELECTRODE AND METHOD OF FORMING THE SAME - An electrode for a spark plug includes an electrode tip end. A first weld affixes at least a portion of the noble metal tip to the tip end of the electrode. The noble metal tip has a fold around its periphery. A second weld joins the fold of the noble metal tip to the tip end of the electrode and creates a seal over the first weld. | 08-29-2013 |
20130221832 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD FOR MANUFACTURING SAME - The spark plug has a configuration satisfying the relationships of B≧0.7A and 0.3 mm≦A≦0.6 mm, where B is an axial thickness along the central axis line Q of the weld portion formed between the base material electrode and the noble-metal chip, and A is an axial distance along the central axis line Q between the intersection points P | 08-29-2013 |
20130307403 | SPARK PLUG WITH INCREASED MECHANICAL STRENGTH - A spark plug with a particular configuration, particularly in the area of a gasket that seals between a shell and insulator, increases the mechanical strength of the spark plug and helps prevent breaking, cracking and/or other failures in the insulator. The spark plug is designed such that the shell, insulator and gasket, which may be in the form of a sleeve-like cylindrical gasket or a ring-like annular gasket, work together to provide better support for the insulator against axial and/or radial stresses. This improved support can offset certain stresses, such as radial stress RS that can be exerted against the insulator core nose when the engine experiences knocking or misfiring. | 11-21-2013 |
20140042893 | SPARK PLUG - A spark plug includes a tip joined to a center electrode. The coefficient of linear thermal expansion of the center electrode is greater than that of the tip. The tip has a gap-forming portion having a maximum width of 1.2 mm or greater and forming a gap in cooperation with the ground electrode and a to-be-joined portion joined to the center electrode. At a position A which is shifted 0.1 mm from the forward end of the outer surface of the fusion portion toward the forward end side, the width of the to-be-joined portion measured on the cross section is smaller than the width of the gap-forming portion. The to-be-joined portion satisfies Dtw/Dw≦1.1, where Dtw represents the width of the to-be-joined portion at the position A, and Dw represents the width of the fusion portion at the forward end of the outer surface thereof. | 02-13-2014 |
20140042894 | SPARK PLUG AND ASSEMBLING STRUCTURE THEREOF - A spark plug having a metallic shell extending along an axis (CL | 02-13-2014 |
20140070692 | SPARK PLUG - A park plug includes a tubular insulator extending along and centered on an axis, and a tubular metal shell secured to an outer peripheral surface of the insulator by crimping, in which powder for sealing is filled between the outer peripheral surface of the insulator and an inner peripheral surface of the metal shell. A relationship between a minimum outer diameter d of the insulator and a maximum inner diameter D of the metal shell in a filling-up area where the powder is filled between the metal shell and the insulator satisfies 1.12≦D/d≦1.16. | 03-13-2014 |
20140084776 | SPARK PLUG - A spark plug includes an insulator, and a metal shell disposed at an outer periphery of the insulator and including a shoulder. The insulator includes a trunk portion, and a leg formed at the tip end side of the trunk portion. The shoulder of the metal shell includes a first shoulder, and a second shoulder formed at the tip end side of the first shoulder. A distance Da between the tip end of the second shoulder and the leg and a distance Db between the tip end of the trunk portion and the second shoulder satisfy a relationship of Da/Db≧1.1. A distance T between the rear end of the first shoulder and the tip end of the second shoulder and a distance L between the rear end of the first shoulder and a tip end face of the metal shell satisfy a relationship of T/L≦0.5. | 03-27-2014 |
20140361679 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD OF MANUFACTURING THE SAME - In a spark plug, a center electrode includes a base member and a discharge chip that has a higher melting point than the base member. The base member and the discharge chip are joined to each other by both a weld and a diffusion layer. The weld is formed, by fusion welding, along an outer periphery of an interface between the base member and the discharge chip into an annular shape. The weld is made up of those parts of the base member and the discharge chip which are molten and mixed together during the fusion welding and solidified after the fusion welding. The diffusion layer is formed radially inside the annular weld. The diffusion layer is made up of those parts of the base member and the discharge chip which are diffused into each other across the interface between the base member and the discharge chip. | 12-11-2014 |
20150357796 | SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A spark plug including a ground electrode body and an electrode tip that is resistance welded to the ground electrode body and that has a discharge surface. In a specific sectional plane, a welding surface is located in the first direction from an outer surface of the ground electrode body. The welding surface includes a flat portion whose distance to the point P | 12-10-2015 |
313145000 | Between center electrode and insulator | 5 |
20100052500 | SPARK PLUG AND METHODS OF CONSTRUCTION THEREOF - A spark plug and method of construction is provided, wherein the spark plug has a generally annular ceramic insulator and a metal shell surrounding at least a portion of the insulator. A ground electrode is operatively attached to the shell, wherein the ground electrode has a ground electrode sparking surface. The spark plug further includes a center electrode having an elongate body with a center electrode sparking surface. The sparking surface of the center electrode and the ground electrode sparking surface provide a spark gap. A brazed joint bonds at least one of the insulator to the shell or the center electrode to the insulator. | 03-04-2010 |
20110298353 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug comprised of an insulator having a stepped portion on an outer circumferential portion thereof, the stepped portion tapering frontward in the direction of the axis of the spark plug, an annular sheet packing and a metallic shell having a taper portion provided on an inner circumferential portion thereof and tapering frontward in the direction of the axis of the spark plug, the metallic shell holding the insulator through a rear end portion thereof being crimped, the stepped portion being seated on the taper portion via the sheet packing, and the taper portion having a groove therein. | 12-08-2011 |
20130264935 | ELECTRODE-ATTACHED INSULATOR AND SPARK PLUG - An electrode-attached insulator having an insulator provided with an axial hole extending in the direction of an axis and a center electrode which is disposed on a distal-end side of the axial hole and has a front end portion that is exposed from a front end of the insulator. The electrode-attached insulator includes a locking member having a collar portion which is locked on a step portion. The center electrode and the locking member are joined together in the axial hole. | 10-10-2013 |
20130328477 | HIGH-FREQUENCY PLASMA SPARK PLUG - An ignition plug includes an insulator having an axial bore extending in the direction of an axis and an electrode inserted into the axial bore, and generates plasma discharge through supply, to the electrode, of high-frequency power generated by a predetermined high-frequency power supply. The electrode includes a center electrode inserted into the forward side of the axial bore and a terminal electrode inserted into the rear side of the axial bore. In the axial bore, the terminal electrode and the center electrode are fixed to the insulator by means of a glass seal which contains a glass component, and are in direct contact with each other. Thus, ignition performance can be further improved. | 12-12-2013 |
20160043531 | SPARK PLUG WITH IMPROVED SEAL - An electrically conductive glass seal for providing a hermetic bond between an electrically conductive component and an insulator of a spark plug is provided. The glass seal is formed by mixing glass frits, binder, expansion agent, and electrically conductive metal particles. The glass frits can include silica (SiO | 02-11-2016 |