NITTAN VALVE CO., LTD. Patent applications |
Patent application number | Title | Published |
20160053641 | HOLLOW POPPET VALVE - A hollow poppet valve ( | 02-25-2016 |
20160047425 | CLUTCH, CLUTCH FORMING PUNCH, AND METHOD OF MANUFACTURING CLUTCH - A clutch comprises: an annular friction plate; an annular metal support having a bottom for supporting thereon the friction plate, an inner wall and an outer wall coaxial with the inner wall, both walls perpendicular to the bottom; and a swaging structure consisting of a first and a second multiplicity of swaging sections provided along the inner wall and along the outer wall, respectively, at equal angular intervals to hold the friction plate on the bottom in such a way that the latter swaging sections are offset from the former swaging sections in the circumferential direction so as not to coincide with the former swaging sections with respect to any radial directions. Such clutch can be manufactured by appropriate use of an inventive punch adapted to form the swaging structure discussed above. | 02-18-2016 |
20160023279 | MACHINING APPARATUS AND DEBURRING DEVICE - A pair of pinching members pinching a workpiece stem portion, and a deburring tool performing deburring onto the workpiece stem portion pinched by the pair of pinching members are disposed under a pair of guide rails. The deburring tool has a recess so that an opening of the recess faces the other end face of the workpiece stem portion, and is capable of a displacement motion in an axis extension direction of the recess while rotating around the recess axis, and a recess inner circumferential surface is formed so as to reduce its diameter as it goes from the recess opening side toward a recess internal side, and a blade portion is provided on the recess inner circumferential surface. Thereby, it is possible to perform deburring without increasing the machining line length, and prevent abnormal wear of a rubbing stone due to the deburring. | 01-28-2016 |
20150354727 | HOLLOW POPPET VALVE - A hollow poppet valve ( | 12-10-2015 |
20150329297 | WORKPIECE INSPECTION EQUIPMENT - To provide workpiece inspection equipment that allows increasing inspection items without increasing the installation space of the inspection equipment as a whole by disposing a plurality of inspection stages around a rotating table for workpiece feeding. Workpiece inspection equipment | 11-19-2015 |
20150266084 | BAR MATERIAL TRANSFER METHOD AND CONVEYOR - A chuck device in a robot hand is used when receiving a primary formed workpiece from electrode chucks. After receiving the primary formed workpiece, and before inserting the primary formed workpiece from its shaft stem part into an insertion hole in a forging press main body, a portion held by the electrode chucks of the primary formed workpiece is gripped by a chuck device different from the chuck device, to release the gripping of the primary formed workpiece by the chuck device. Therefore, it is possible to insert the holding portion held by the electrode chucks from the side of the shaft stem part of the primary formed workpiece into the insertion hole. Thereby providing a bar material transfer method capable of accurately inserting the bar material from its one end into a predetermined positioning hole even if a bar material serving as a workpiece is short. | 09-24-2015 |
20150247428 | VARIABLE PHASER FOR AUTOMOBILE ENGINE - In a variable phaser for an engine including a drive rotating member having a cylindrical section and driven by a crank shaft, a cam shaft coaxially supporting the drive rotating member in a coaxial and relatively rotating fashion, a relative phase angle changing mechanism, and a self-locking mechanism preventing the misalignment of the relative phase angle due to the cam torque by pressing the lock plate held on a holding section integral with the cam shaft to an inner circumferential surface of the cylindrical section, plate-pressing surfaces disposed at positions almost equally separated along an outer circumferential direction of an outer circumference of the holding section, and a plurality of lock plates equally separated in correspondence to the plate-pressing surfaces are formed, and the respective plate-pressing surfaces are formed by first and second pressing surfaces for delivering the cam torques along advance and lag directions to the respective lock plates. | 09-03-2015 |
20150240675 | HOLLOW POPPET VALVE - A hollow poppet valve ( | 08-27-2015 |
20150152529 | Ni-Fe-Cr ALLOY AND ENGINE VALVE WELDED WITH THE SAME ALLOY - A hard-facing alloy having impact resistance, wear resistance and hot corrosion resistance and containing Fe which is a bountiful resource and inexpensive is provided. Provided are: a Ni—Fe—Cr alloy containing 0 to 20.0 mass % of Mo, 8.0 to 40.0 mass % of W, 20.0 to 40.0 mass % of a total amount of Mo and W, 20.0 to 50.0 mass % of Fe, 12.0 to 36.0 mass % of Cr and 1.0 to 2.5 mass % of B, and the remainder being Ni and unavoidable impurities; and an engine valve welded with the same alloy. The above Ni—Fe—Cr alloy can further contain 15 mass % or less of a total amount of elements selected from Co, Mn, Cu, Si and C, in such cases, 15.0 mass % or less of Co, 5.0 mass % or less of each of Mn and Cu, 2.0 mass % or less of Si and 0.5 mass % or less of C are preferred. | 06-04-2015 |
20150136304 | METHOD OF FRICTION WELDING AND APPARATUS OF FRICTION WELDING - To provide a method of friction welding and an apparatus of friction welding in which a length of time for manufacturing one product is reduced as much as possible regardless of the dimension errors of works. The fast forwarding distance Lx | 05-21-2015 |
20150075470 | MECHANICAL LASH ADJUSTER - The mechanical lash adjuster is arranged between a cam and one end of the stem of a valve urged by a valve spring. The lash adjuster comprises an unrotatable housing having a thread, a plunger subjected to the force of the cam and formed with a thread in engagement with the thread of the housing, and a plunger spring urging the plunger against the action of the valve spring. The lead and flank angles of the engaging threads are set such that the engagement threads can slidably rotate under a given shaft load applied to the plunger unless the frictional torque TB, generated by the friction between the slidable frictional surface F | 03-19-2015 |
20150068477 | VARIABLE CAM PHASER FOR AUTOMOBILE ENGINE AND CONTROLLER THEREFOR - This invention provides an improved variable cam phaser for an automobile engine equipped with a controller capable of enabling execution of a given phase angle varying command in a shortened response time. The variable cam phaser has two control rotors which are arranged coaxial with a camshaft and rotatable relative to each other under the influence of two electromagnetic actuators and driven by the crankshaft of the engine. The variable cam phaser also has a relative phase angle varying mechanism for varying the relative phase angle of the camshaft relative to the crankshaft. When the two electromagnetic actuators are simultaneously energized, the two control rotors are held mutually unrotatable. However, when the braking torque of one actuator is reduced, the control rotor associated with that actuator is rotated relative to the other control rotor to immediately start the execution of the command. | 03-12-2015 |
20140352803 | HOLLOW POPPET VALVE - To provide a hollow poppet valve having an improved heat reduction effect. In a hollow poppet valve ( | 12-04-2014 |
20140352389 | FORGING PRESS DEVICE FOR VALVE - A forging press device for valve including an upsetter in which a plurality of primary forming stages are provided, a forging press main body adjacent to the upsetter, that secondarily forms a primary formed workpiece, and a workpiece conveyance/carry-in device which grips and conveys the workpiece, to carry it into the forging press main body, the device in which the workpiece conveyance/carry-in device is composed of a high speed multi jointed robot capable of circling around a vertical shaft, which has an arm (a chuck) gripping the workpiece. In accordance with the invention, it is possible to provide a forging press device for valve in which the number of deliveries of workpiece from the upsetter to the forging press main body is decreased, which speeds up a valve forging line, and improves the production efficiency. | 12-04-2014 |
20140345354 | ENGINE VALVE FORGING SYSTEM - An engine valve forging system includes a molding forging die having a circular hole stem molding portion continued to a tip end of a head type molding portion, to mold an engine valve by extrusion-forging a material from the head type molding portion to the stem molding portion by an upper die, and a stem guide forging die which is coaxially disposed to communicate with a tip end of the stem molding portion, and has a guide portion for a stem portion of an engine valve extruded from the stem molding portion, and a plurality of stem curve restraining portions having a shape gradually tapering toward a central shaft line from a rear end portion to a tip end portion are formed continuously along the central shaft line of the guide portion in the guide portion, to be capable of manufacturing high-precision engine valves with less stem curve. | 11-27-2014 |
20140322660 | Automated Heat Treatment System for Engine Valve - An inventive automated heat treatment system has a furnace for heat treating forged engine valves, a carry-in mechanism for transporting the forged valves into the furnace, and a carry-out mechanism for transporting heat treated valves out of the furnace. Each of the carry-in mechanism and the carry-out mechanism has a retention mechanism for retaining valves hung, and a transport mechanism for transporting valves to the furnace as they are hung. The furnace has heating means, groups of paired rails for supporting and moving the valves hung in the furnace, and a stopper for controlling the positions of the valves on the rails. The engine valves are maintained hung with their umbrella-shaped portions supported by the respective mechanisms throughout the automated heat treatment processes. Thus, the heat treatment of engine valves is done in a fewer steps than in a conventional system. | 10-30-2014 |
20140299082 | CONTINUOUSLY VARIABLE VALVE LIFT DEVICE - A continuously variable valve lift device with improved lift amount change accuracy includes a rocker arm causing an engine valve to perform an opening/closing operation with a cam of a cam shaft, and an engine valve lift amount change mechanism. The mechanism has a control shaft which has an eccentric circular disc cam, a control arm which swings about the eccentric circular disc cam and having a cam contact portion in contact with a first cam and a first aim, second biasing means for biasing the cam contact portion against the first cam, a second cam portion of a free-form surface shape contacting with the second arm and the rocker arm, a cam member supported so as to be capable of turning around the shall main body, and a link arm with both ends supported so as to be capable of turning by the first arm and the second arm. | 10-09-2014 |
20140283384 | METHOD OF MANUFACTURING A VALVE FOR AN INTERNAL COMBUSTION ENGINE - A method of manufacturing a valve for an internal combustion engine, comprises: (i) a primary step of forging a bulging portion at one end of a rod material to form a generally disk-shape valve head of the valve having a tapered periphery; (ii) an thickness adjustment step of machining an excessively thick portion of the valve head; and (iii) a secondary step of forging a peripheral region of the valve head to create radial slip deformations therein to form a valve face of the valve head. In the step of thickness adjustment, only the front end of the disk-shape valve head is machined without harming dense grain flow lines induced in the tapered face ( | 09-25-2014 |
20140196677 | PHASE VARYING APPARATUS FOR AUTOMOBILE ENGINE - A phase varying apparatus capable of smoothly varying the phase angle of a camshaft relative to a drive rotor by comprising: a drive rotor supported by a camshaft and driven by a crankshaft; a first control rotor integral with the camshaft; a first torquing mechanism for providing the first drive rotor with a torque in one direction, and a reverse rotation mechanism for proving the first control rotor with a torque in the opposite direction, wherein the reverse rotation mechanism comprises a first radius-decreasing guide groove formed in the control rotor, a crank member adapted to rotate about a position offset from the rotational axis of the drive rotor, and a first pin mechanism mounted on the crank member and movable in the radius-decreasing guide groove, and a second operative mechanism for rotating the first control rotor in the opposite rotational direction relative to the drive rotor. | 07-17-2014 |
20140191150 | POPPET VALVE WITH A FORMED SEAT, AND METHOD OF MAKING - A method of forming a poppet valve having a stem, a valve head and a valve seat while concurrently maintaining compressive residual stress without grain coarsening on both the valve body and the valve seat. The method includes forming a rounded cladded part on the valve head of the poppet valve by welding and forming a valve seat surface at a predetermined aperture angle and cutting the cladded part to form a smooth surface which is subjected to uniform contact pressure at a temperature less than the recrystallization temperature of the base material or cladding material, whichever is lower, to enhance the durability of the valve seat. | 07-10-2014 |
20140031165 | PLANETARY GEAR REDUCTION MECHANISM - A compact planetary gear reduction mechanism having a universal gear reduction ratio is provided, which comprises: an input shaft rotatable about a first rotational axis; at least one planetary gear having a first and a second gear of the same shape integrated together rotatably about a third rotational axis (O3) but in out of phase with each other; an eccentric rotary plate for transmitting the rotational motion of the input shaft to a shaft mechanism which in turn transmits the eccentric rotation of the eccentric rotary plate to the planetary gear; an external fixed sun gear meshed with the first gear of the planetary gear; and an external driven sun gear to be connected to the output shaft of the gear reducer, having a different number of gear teeth than the fixed situ gear and meshed with the second gear of the planetary gear. | 01-30-2014 |
20140007832 | ROCKER ARM FOR VALVE CONTROL APPARATUS - To provide a rocker arm for a valve control apparatus of an automobile engine, which enables downsizing of the valve control apparatus and provides improved fuel economy of the engine. The rocker arm is provided with: a top plate; at least one upright wall section; a cam slide section, formed on top of the top plate, in contact with a cam mounted on a camshaft; a supporting member for rockably supporting the rocker arm about the rocking center of the supporting member; and a pad face, formed at the other end of the rocker arm, in contact with a valve system. Said at least one upright wall section has a smaller width than the top plate, and extends from the top plate at a substantially right angle. | 01-09-2014 |
20130221261 | WEAR-RESISTANT COBALT-BASED ALLOY AND ENGINE VALVE COATED WITH SAME - A surface hardening material being excellent in abrasion resistance and having impact resistance is provided. Provided are: a wear-resistant cobalt-based alloy containing 20.0 to 30.0 mass % of a sum of Mo and/or W, 0.8 to 2.2 mass % of B, 5.0 to 18.0 mass % of Cr, 5.0 mass % or less of a sum of Fe, Ni, Mn, Cu, Si and C, 1.0 mass % or less of Si, and 0.3 mass % or less of C, and the remainder comprising 55.0 to 70.0 mass % of Co and unavoidable impurities; and an engine valve coated with the same. | 08-29-2013 |
20130221070 | BURRING APPARATUS FOR FRICTION WELDING MACHINE - A burring apparatus for a friction welding machine comprises a clamp unit provided at the front end of a horizontal main spindle, for holding work piece W | 08-29-2013 |
20130206089 | VARIABLE CAM PHASER FOR AUTOMOBILE ENGINE AND CONTROLLER THEREFOR - This invention provides an improved variable cam phaser for an automobile engine equipped with a controller capable of enabling execution of a given phase angle varying command in a shortened response time. The variable cam phaser has two control rotors which are arranged coaxial with a camshaft and rotatable relative to each other under the influence of two electromagnetic actuators and driven by the crankshaft of the engine. The variable cam phaser also has a relative phase angle varying mechanism for varying the relative phase angle of the camshaft relative to the crankshaft. When the two electromagnetic actuators are simultaneously energized, the two control rotors are held mutually unrotatable. However, when the braking torque of one actuator is reduced, the control rotor associated with that actuator is rotated relative to the other control rotor to immediately start the execution of the command. | 08-15-2013 |
20130192552 | PHASE VARYING APPARATUS FOR AUTOMOBILE ENGINE TECHNICAL - The inventive phase varying apparatus ( | 08-01-2013 |
20130125846 | VARIABLE CAM PHASER FOR AUTOMOBILE ENGINE - The invention provides a variable cam phaser for an automobile engine, equipped with a self-locking mechanism which is simpler in structure, cost effective, and easy to manufacture. The self-locking mechanism includes: a eccentric circular members ( | 05-23-2013 |
20120247912 | ELECTROMAGNETIC-CLUTCH ROTATION STOPPING STRUCTURE - An axially short electromagnetic-clutch rotation stopping structure for use with a phase varying apparatus ( | 10-04-2012 |
20120210773 | METHOD OF TESTING AIR TIGHTNESS OF SEALED LASH ADJUSTER | 08-23-2012 |
20120090567 | PHASE VARIABLE DEVICE FOR ENGINE - OBJECT: To provide a compact phase varying device for an automobile engine, adapted to vary the relative phase angle between the crankshaft of the engine and the camshaft of the device over a wider range than that of conventional device. | 04-19-2012 |
20120073532 | PHASE VARYING DEVICE FOR ENGINE | 03-29-2012 |
20120042843 | HYDRAULIC LASH ADJUSTER FOR INTERNAL COMBUSTION ENGINE | 02-23-2012 |
20110297114 | PHASE VARYING APPARATUS FOR AUTOMOBILE ENGINE - PROBLEMS TO BE SOLVED | 12-08-2011 |
20110226202 | CAM SHAFT PHASE VARIABLE DEVICE IN ENGINE FOR AUTOMOBILE - A cam shaft phase variable device of an engine in which the attachment angle of a crankshaft and a cam shaft is maintained securely without being shifted by disturbance torque. The device has a drive body of revolution having a tubular section and a guide groove of reducing diameter and rotating relatively to the cam shaft and being driven by a crankshaft, a control body of revolution rotating relatively to the drive body through a rotary operating force imparting means and having the outer circumferential surface supported by the inner circumferential surface of the tubular section, an eccentric circular cam rotating synchronously, a movable member for displacing the guide groove, a cam guide intersecting the central axis perpendicularly and displaced by the eccentric circular cam, and an intermediate body of revolution displacing in the direction intersecting the cam guide perpendicularly while being supported on, and rotating integrally with, the camshaft. | 09-22-2011 |
20110192365 | CAM SHAFT PHASE VARIABLE DEVICE IN ENGINE FOR AUTOMOBILE - [Problems] To provide an inexpensive cam shaft phase variable device of an engine in which the displacement width of attachment angle between a crankshaft and a camshaft is large and operational sound is silent. | 08-11-2011 |
20110186000 | HOLLOW POPPET VALVE AND METHOD OF MANUFACTURING THE SAME - A hollow poppet valve has a stem portion provided at one end thereof with a tip portion; a cap portion; and a flared fillet portion formed between the stem portion and the cap portion, wherein at least a part of the stem portion that connects to the fillet portion is a thin hollow cylindrical member, and the cap member is welded to the fillet portion. The cap member is thin and has an arcuate axial cross section. It is laser-beam welded to the seat-abutment portion formed at the open end of the fillet portion such that a weld bead is formed along the inner periphery of the interface of the mated ends of the members. The weld bead adds an extra weld depth to the weld, which increases the modulus of section of the welded regions of the cap member and the fillet portion and enhances their welding strength. | 08-04-2011 |
20110162610 | HERMETICALLY SEALED LASH ADJUSTER - A sealed type lash adjuster ( | 07-07-2011 |
20110126791 | EXHAUST POPPET VALVE AND SOLUTION HEAT TREATMENT METHOD OF THE SAME - Object of the Invention The invention provides a forged exhaust poppet valve and a method of solution heat treating the same, in which only a predetermined portion of the valve is subjected to the solution heat treatment so as to provide the seat portion of the valve with satisfactory wear resistance, and a predetermined transitional neck-stem region with satisfactory high-temperature creep strength. | 06-02-2011 |
20110000450 | PHASE CHANGING DEVICE FOR AUTOMOBILE ENGINE - Objects The invention provides a phase changing device for automobile engine capable of preventing an unanticipated change in phase angle between the middle rotor and the camshaft of the device caused by a disturbing torque while preventing frictional wear of the inner circumferential walls of groove guides and avoiding generation of axial thrusts of links of the device. | 01-06-2011 |
20100326386 | ENGINE VALVE CONTROLLER - [Problems] To keep a determined phase angle without consuming power once the phase angle is determined. | 12-30-2010 |
20100313836 | PHASE VARIABLE DEVICE IN CAR ENGINE - The invention provides a phase variable device for use with a car engine, capable of preventing the phase angle of the camshaft from varying relative to the first circular rotational body even if the camshaft is subjected to the reaction of a valve spring, and capable of reducing the impulsive generated in the phase variable device and delivered to the engine. MEANS FOR ACHIEVING THE OBJECT | 12-16-2010 |
20100282194 | SEALED-TYPE LASH ADJUSTER - A lash adjuster | 11-11-2010 |
20100242886 | SEALED LASH ADJUSTER AND SEAL STRUCTURE BETWEEN FIRST AND SECOND PARTS - A sealed lash adjuster ( | 09-30-2010 |
20100050969 | MECHANICAL ADJUSTER - [Problem] To adjust increase/decrease in valve clearance automatically. | 03-04-2010 |
20100024754 | VALVE CONTROL APPARATUS FOR ENGINE - [OBJECT] After having determined a phase angle, the phase angle is maintained as the determined one without consuming electric power. [ACHIEVING MEANS] An intermediate member | 02-04-2010 |
20100000481 | PHASE VARYING APPARATUS FOR ENGINE - [Object] Heat generation is not caused by friction in a phase varying apparatus for use with a vehicle engine. | 01-07-2010 |
20090266314 | COOLANT-CONTAINING HOLLOW POPPET VALVE AND PROCESS FOR PRODUCING THE SAME - This invention provides a coolant-containing hollow poppet valve, which, in use, in consideration of a temperature distribution caused in each pert of the valve, causes a lowering in fatigue strength and creep strength in the valve at its site exposed to high temperatures falling within the tolerante of design standard, and, in consideration of required properties at the other valve sites, holds abrasion resistance and strength, and a process for producing the same. An improvement in heat resistance, abrasion resistance and strength depending upon properties required in each site can be realized by conducting a cold drawing step and an intermediate annealing step to bring the Vickers hardnesses of a cylindrical shaft portion ( | 10-29-2009 |
20090260590 | PHASE VARYING DEVICE OF ENGINE - [PROBLEMS] To prevent generation of heat by friction in a phase varying device of the engine of an automobile. | 10-22-2009 |
20090183704 | PHASE VARYING APPARATUS FOR ENGINE - [Object] To keep an air-gap between an electromagnetic clutch and a magnet within a predetermined range even if a camshaft vibrates in a radial direction. | 07-23-2009 |
20090090324 | Sealed Lash Adjuster and Method for Adjusting Amount of Liquid Sealed in Sealed Lash Adjuster - The liquid is sealed in the lash adjuster so that the volume “V1” of the gas, in the reservoir chamber when the lash adjuster is being produced and the plunger protrudes from the body, is equal to or more than 1.24 times as great as the sum of the volume “Vo1” of the liquid discharged from the high-pressure chamber when the plunger moves downward, and the increase “Vo2” in the volume of the liquid that expands, due to heat, when the temperature of the gas in the reservoir chamber is increased from the production temperature to the maximum use temperature, and the ratio of “V1” to “Vo1+Vo2” is equal to or higher than a ratio, which is derived based on the production temperature and the maximum use temperature, when the inner pressure of the lash adjuster increases by 500 kPa at maximum. | 04-09-2009 |
20090056659 | DIRECT-ACTING TYPE VALVE LIFTER FOR INTERNAL-COMBUSTION ENGINES - Objects: To provide a direct-acting type valve lifter that is simple in structure, involves a small number of components, and is capable of switching its valve lift between a high and a low lift. | 03-05-2009 |