Class / Patent application number | Description | Number of patent applications / Date published |
445007000 | Spark plug or spark gap making | 39 |
20090215348 | INSULATOR FOR SPARK PLUG, AND METHOD FOR MANUFACTURING SPARK PLUG - A method for manufacturing an insulator includes: preparing a press pin and a forming die having a cavity, the press pin including a pin-side spiral portion formed on a first position; filling a raw powder into the cavity; arranging the press pin within the cavity; pressing the raw powder within the cavity along with the press pin, and obtaining a green body formed with a green body-side spiral portion; releasing the green body along with the press pin from the cavity; retreating the press pin with respect to the green body while rotating the press pin relative to the green body around an axis, and extracting the press pin from the green body; and removing an unnecessary portion from the green body. The first position is positioned such that the green body-side spiral portion is located in the unnecessary portion of the green body. | 08-27-2009 |
20090239437 | INSULATOR FOR SPARK PLUG, AND METHOD FOR MANUFACTURING SPARK PLUG - A method for manufacturing an insulator for a spark plug is provided. The method includes: a preparing step; a press pin arranging step; a powder filling step after the press pin arranging step; a cavity blocking step after the powder filling step; a compression molding step after the cavity blocking step; a die releasing step after the compression molding step; and a press pin removing step after the die releasing step. | 09-24-2009 |
20100048083 | METHOD OF MANUFACTURING SPARK PLUG - A process for forming a glass seal layer in a spark plug, comprising an inserting step of inserting a terminal electrode into an axial hole in an insulator, a hot compression step of pushing the terminal electrode in a heated state to thereby compress the glass powder mixture, and a cooling step of performing cooling to thereby form the glass seal layer. | 02-25-2010 |
20100136867 | SPARK PLUG AND METHOD FOR MANUFACTURING SPARK PLUG - This invention has an object to provide a spark plug exhibiting high withstand voltage characteristics and high strength at high temperature, formed by an alumina-based sintered body prepared with excellent processability and high productivity, and a method for manufacturing the spark plug. This invention relates to a spark plug | 06-03-2010 |
20100203791 | METHOD FOR MANUFACTURING SPARK PLUG - A method for manufacturing a spark plug which includes: (a) preparing a metal shell; (b) preparing an insulator; (c) inserting the insulator in an insertion hole of the metal shell; (d) forming an intended crimping portion of the metal shell into a crimping portion; and (e) pressing a lower side portion of the metal shell closer to a position lower than the intended compressive deformation portion, and pressing the crimping portion of the metal shell in an axial direction to compressively deform the intended compressive deformation portion of the metal shell and thus seal a space between a stepped portion of the metal shell and a stepped portion of the insulator, wherein step (e) controls a pressing amount of a press in a constant value from the start of compressive deformation to the end thereof. | 08-12-2010 |
20100233929 | METHOD OF MANUFACTURING SPARK PLUG - A decrease in yield and degradation of productivity can be avoided when a spark plug having an insulator with low mechanical strength is manufactured. In a second process, a terminal electrode | 09-16-2010 |
20100273385 | SPARK PLUG ELECTRODE AND PROCESS FOR MAKING - A spark plug and method for making. The spark plug comprises a center electrode, an insulator surrounding the center electrode, and a metallic shell surrounding the insulator. The spark plug also includes a ground electrode engaged with the metallic shell. The ground electrode has a first surface facing the center electrode for defining a spark gap and a second surface opposite the first surface. A cross-section of the ground electrode between the first and second surfaces includes a first zone of a non-noble metallic base material extending a distance from the second surface toward the first surface and a second zone of a blend of the non-noble base material and a noble metallic material extending from the first zone to the first surface. A method of making the spark plug includes the step of disposing a quantity of noble metallic material on an electrode blank formed of a non-noble metallic base material. The method also includes the step of at least partially melting the quantity of noble metal with a beam emitted by a laser. The method also includes the step of sequentially moving the laser along the electrode blank in first and second opposite directions to enhance the distribution of the molten quantity of noble metal over the electrode blank. | 10-28-2010 |
20110045731 | METHOD OF PRODUCING A SPARK PLUG - To provide a method of producing a spark plug in which a spark discharge gap with a suitable distance can easily be obtained without bending to deform a ground electrode in a direction in which the ground electrode moves towards or away from a metal tip of a center electrode, in the method of producing a spark plug, when a metal tip (a noble metal tip) | 02-24-2011 |
20110171870 | SPARK PLUG MANUFACTURING METHOD AND SPARK PLUG MANUFACTURING APPARATUS - A method and an apparatus for manufacturing a spark plug. A bending apparatus includes a bending unit having a preliminary bending unit and a main bending unit, and a gap adjusting unit. The main bending unit including pressing unit for pressing a distal end of a ground electrode toward a center electrode, and a gap adjusting unit configured to adjust a relative height position of the distal end of the ground electrode relative to a distal end of the center electrode in an axis line direction. The gap adjusting unit includes a gap adjusting unit for relatively moving the distal end of the ground electrode relative to the center electrode in a direction substantially perpendicular to the axis line direction, and a restricting unit for restricting relative movement of the distal end of the ground electrode relative to the center electrode in the axis direction. | 07-14-2011 |
20110177744 | Method for producing a spark plug electrode - A method for producing a spark plug is provided, which includes a ground electrode fixed to a housing, and a center electrode insulated electrically from the housing by an insulator, the ground electrode having a ground electrode base and a ground electrode section, which ground electrode section including an electrode base and a noble metal section. In order to produce the spark plug, the ground electrode base is connected to the ground electrode section, in which, in a first step, the electrode base is connected to the noble metal section to form the ground electrode section, and in a second step, the ground electrode section is connected to the ground electrode base. | 07-21-2011 |
20110183573 | METHOD OF MANUFACTURING METAL SHELL ASSEMBLY FOR SPARK PLUG, METHOD OF MANUFACTURING SPARK PLUG, AND APPARATUS FOR MANUFACTURING METAL SHELL ASSEMBLY FOR SPARK PLUG - A method of manufacturing a metal shell assembly for a spark plug including a cylindrical metal shell that extends in a direction of a central axis and which has a screw portion formed in an outer peripheral surface thereof, and a bar-shaped ground electrode that extends from a front end portion of the metal shell, the method including: disposing an intermediate assembly, having the ground electrode provided in a metal shell intermediate body, between a plurality of rolling dies having process surfaces facing each other; forming the screw portion by performing a rolling process on the intermediate assembly by the plurality of rolling dies while the intermediate assembly is interposed between the plurality of rolling dies; and positioning the ground electrode in a circumferential direction about a central axis of the intermediate assembly between the disposing and forming steps. | 07-28-2011 |
20110287683 | METHOD FOR MEASURING DEVIATION OF JOINT POSITION OF MEMBER AND METHOD FOR PRODUCING SPARK PLUG - In a method for measuring deviation of a ground electrode from an optimal igniting position, a metallic shell is engaged with a female thread jig. Then the axis O of the metallic shell, a predetermined first measuring point P | 11-24-2011 |
20120015578 | METHOD OF MANUFACTURING SPARKPLUGS - A method of manufacturing a spark plug having an insulator, a center electrode, a metallic shell, a ground electrode, and a noble metal tip provided on the ground electrode and having a discharge surface forming a spark discharge gap in cooperation with the center electrode. The method of manufacturing includes a fusion-zone formation step of forming a fusion zone through radiation of a high-energy beam to the boundary between the ground electrode and the noble metal tip. | 01-19-2012 |
20120028530 | HIGH THREAD GROUND SHIELD - A method of forming a spark plug for an internal combustion engine is provided, the method including the steps of: separately securing a ground electrode to a ground shield, the ground shield having an elongated base section being configured to substantially surround a first insulator section of an insulator configured to substantially surround a center electrode, the insulator having a substantially cylindrical body with at least the first insulator section and a second insulator section, the first and second insulator sections having first and second diameters respectively and being separated by an insulator shoulder; and the elongated center electrode having a center electrode tip at one end and a terminal proximate another end of the center electrode, wherein the ground shield has a frustoconical flange protruding from a first end of the elongated base section, the frustoconical flange being configured to engage the insulator shoulder, and wherein the ground electrode extends from a second end of the elongated base section to define a spark gap with respect to the center electrode tip; and securing the ground shield to the spark plug after the ground electrode has been separately secured to the ground shield. | 02-02-2012 |
20120142243 | HIGH POWER DISCHARGE FUEL IGNITOR - A spark-ignited, internal combustion engine ignition device to increase electrical transfer efficiency of the ignition by peaking the electrical power of the spark during the streamer phase of spark creation and improving combustion quality, incorporating an electrode design and materials to reduce electrode erosion due to high power discharge, an insulator provided with capacitive plates to peak the electrical current of the spark discharge, and concomitant methods. | 06-07-2012 |
20120142244 | METHOD OF MANUFACTURING CENTER ELECTRODE AND SPARK PLUG - A method of manufacturing a center electrode of a spark plug, comprising the steps of forming a cylindrical electrode member having a medium diameter portion and a small diameter portion and forming a barrel portion by extruding the medium diameter portion when the value of (S1−S2)/S1×100) is 30 or more, S1 being the cross-sectional area of a cross-section of the medium diameter portion perpendicular to an axial direction, and S2 being the cross-sectional area of a cross-section of each small diameter portion perpendicular to the axial direction. | 06-07-2012 |
20120190266 | METHOD FOR MANUFACTURING SPARK PLUG FOR INTERNAL-COMBUSTION ENGINE - A method of manufacturing a spark plug having an attachment fitting | 07-26-2012 |
20120196498 | METHOD OF MANUFACTURING A SPARK PLUG ELECTRODE AND A SPARK PLUG - A method for manufacturing electrodes for a spark plug that reduces manufacturing time. The method includes a supply step of supplying a workpiece to a die for extrusion forming, wherein the die has a supply hole and an extrusion hole located adjacent to the supply hole for forming the workpiece to have a predetermined cross-sectional shape. The supply hole has a cross section greater than a cross section of the extrusion hole. The method also includes a forming step of pushing the workpiece, supplied to the supply hole, through the extrusion hole so as to form the workpiece into a shape corresponding to the cross section of the extrusion hole. In the supply step, the workpiece is supplied such that a plurality of workpieces form a vertical line in the die. | 08-02-2012 |
20120208424 | METHOD FOR MANUFACTURING SPARK PLUG - When a movable blade cuts a distal end portion of a ground electrode member and is pulled back along a cut surface formed at a distal end of the ground electrode member, the distal end portion may move in the pull-back direction of the movable blade due to friction generated between the movable blade and the cut surface. This movement could cause deflective deformation of the ground electrode member. In order to restrain such movement, a support part is provided on the movable blade via a spring located near the cut surface. During the pull back step, the support part presses and supports the portion of the cut ground electrode member near the distal end thereof. Therefore, even when friction is generated when the movable blade is pulled back, the ground electrode member does not undergo deflective deformation. | 08-16-2012 |
20120220180 | PLATINUM ALLOY FOR SPARK PLUG ELECTRODES AND SPARK PLUG HAVING A PLATINUM ALLOY ELECTRODE - A method of manufacturing a spark plug, the method including the step of: securing an electrode tip to at least one of a side ground electrode or a center electrode of the spark plug, 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. | 08-30-2012 |
20120252298 | METHOD OF MANUFACTURING SPARK PLUG - In joining a composite tip to an electrode, a method is used for properly adjusting the height of radiation of a laser beam to the height of the boundary between two tips used to form the composite tip. Further, a process for joining a first tip and a second tip together by use of a laser beam includes the steps of; (a) disposing the second tip on a support; (b) obtaining, after pressing downward at least the second tip by the use of a pressing jig, a correction value for correcting the height of radiation of a laser beam; (c) correcting the height of radiation of the laser beam on the basis of the correction value; and (d) joining the first and second tips together by use of the laser beam. | 10-04-2012 |
20120258644 | SPARK PLUG MANUFACTURING METHOD - A spark plug manufacturing method provides a reduction in the cost of raw material preparation and the cost of the disposal of unused powder by recycling powder not used in forming a filler layer of another spark plug. The method is used to make a spark plug that includes a metal shell having a through hole, and an insulating body held inside the through hole, and a filler layer containing talc in a space surrounded by an inner peripheral surface of the through hole and an outer peripheral surface of the insulating body. The powder not used in a process of forming a filler layer of another spark plug is recycled for forming the filler layer of the present spark plug, where the forming process is performed after talc and a binder are mixed. | 10-11-2012 |
20120264344 | METHOD OF MAKING SPARK PLUG CASING AND SPARK PLUG HAVING THE SPARK PLUG CASING - A spark plug casing includes a single-piece shell having a nut portion, first and second tubular portions and a converging shell portion, which are configured to be removed from a cylinder head as an integral device. The first tubular portion extends from the nut portion and has a first cross-sectional size. The second tubular portion has a second cross-sectional size less than the first cross-sectional size. The converging shell portion is coupled between the first and second tubular portions. The casing further includes a ground strap having a third cross-sectional size less than the second cross-sectional size. The ground strap is received within an end portion of the second tubular portion opposite the converging shell portion, such that the ground strap and the cylinder head are in a spaced relationship with respect to each other for preventing carbon buildup from binding the ground strap to the cylinder head. | 10-18-2012 |
20120289115 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND MANUFACTURING METHOD THEREOF - A spark plug includes a tubular metal shell, an insulator, a cylindrical center electrode, and a ground electrode. The ground electrode has an inclined portion, a straight portion, and a bend between the inclined and straight portions. The inclined portion extends obliquely with respect to the axial direction of the center electrode from a base end of the ground electrode, which is joined to an end of the metal shell, to the bend that is positioned closer to the center electrode in the radial direction of the center electrode than the base end. The straight portion extends substantially parallel to the axial direction of the center electrode from the bend to a tip end of the ground electrode. The straight portion has an inner side surface facing the side surface of an end portion of the center electrode through a spark gap in the radial direction of the center electrode. | 11-15-2012 |
20130012094 | SPARK 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. | 01-10-2013 |
20130065473 | METHOD OF MANUFACTURING SPARK PLUG - A method of manufacturing a spark plug wherein a tip having a burr-free surface is more reliably welded to a ground electrode, to thereby realize an excellent joint strength. The spark plug includes a center electrode, a ground electrode, and a ground-electrode-side tip joined to the ground electrode through its joining surface. The method of manufacturing includes a tip forming step and a tip joining step of resistance-welding the ground-electrode-side tip to the ground electrode. A wire rod having a reference surface is formed, and the wire rod is cut by moving a cutting blade from one edge of the reference surface with respect to the width direction thereof toward the other edge of the reference surface with respect to the width direction, thereby obtaining the ground-electrode-side tip. At least a portion of the reference surface is joined to the ground electrode, whereby that portion becomes the joining surface. | 03-14-2013 |
20130065474 | METALLIC INSULATOR COATING FOR HIGH CAPACITY SPARK PLUG - A spark plug (24) of an internal combustion engine is provided with an integrated capacitor feature to increase the intensity of its spark. The capacitor feature is formed by applying metallic film (62, 64) to the inner (30) and outer surfaces of a tubular insulator (26). The insulator (26) forms a dielectric and sustains an electrical charge when an electrical differential is established between the inner (64) and outer (62) metallic films. The stored electrical charge is discharged with the firing of a spark. The metallic films can be applied as a paint or ink directly to the surfaces of the insulator (26), or can be mixed with a glazing compound to form conductive coatings simultaneous with the glazing operation. Ganged (62′) or serpentine (62″) micro-plates can be formed within either or both of the inner and outer metallic films to increase the charge-carrying surface area. | 03-14-2013 |
20130196563 | METHOD OF FORMING A SPARK PLUG - A method for forming a spark plug includes positioning an electrode center wire within an insulator and positioning at least one substance within the insulator and proximate the electrode center wire. The method further includes ultrasonically tamping the at least one substance to the electrode center wire. | 08-01-2013 |
20130225029 | METHOD AND DEVICE FOR MANUFACTURING SPARK PLUG - A spark plug includes a ceramic insulator extending in the direction of an axis (CL | 08-29-2013 |
20130280980 | MANUFACTURING METHOD FOR SPARK PLUG - A method of manufacturing a spark plug includes a joining step of joining a first member and a second member which constitute the spark plug. In the joining step, a first welding electrode in contact with the first member and a second welding electrode which has an elastically deformable intermediate portion and which is in contact with the second member are electrically connected through the first member and the second member, whereby the first member and the second member are joined together by resistance welding. | 10-24-2013 |
20130337718 | ENCAPSULATED METAL MICROTIP MICROPLASMA DEVICE AND ARRAY FABRICATION METHODS - Methods of the invention can form microtip microplasma devices having the first and second metal microtips and metal oxide in a monolithic, unitary structure. Methods can form arrays that can be flexible, can be arranged in stacks, and can be formed into cylinders, for example, for gas and liquid processing devices, air filters and other applications. A preferred method of forming an array of microtip microplasma devices provides a metal mesh with an array of micro openings therein. Electrode areas of the metal mesh are masked leaving planned connecting metal oxide areas of the metal mesh unmasked. Planned connecting metal oxide areas are electrochemically etched to convert the planned connecting metal oxide areas to metal oxide that encapsulates opposing metal microtips therein. The mask is removed. The electrode areas are electrochemically etched to encapsulate the electrode areas in metal oxide. | 12-19-2013 |
20130344765 | METHOD OF MANUFACTURING A SPARK PLUG ELECTRODE MATERIAL INTO A DESIRED FORM - A method of making an electrode material for use 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 ruthenium-based material that includes ruthenium as the single largest constituent. The disclosed method includes hot-forming a layered structure that includes a ruthenium-based material core, an interlayer having a refractory metal disposed over the ruthenium-based material core, and a nickel-based cladding disposed over the interlayer. | 12-26-2013 |
20140065915 | METHOD FOR MANUFACTURING SPARK PLUG - A method for manufacturing a spark plug includes an assembling step of assembling an insulator into a metallic shell by insertion of the insulator into the metallic shell from an axially rear end opening portion of the metallic shell. The assembling step includes a displacement restricting step of restricting a relative positional displacement between the metallic shell and the insulator in a radial direction intersecting with the axial direction so as to reduce eccentricity between the axis of the metallic shell and the axis of the insulator to a predetermined value or less, while allowing a relative positional displacement between the metallic shell and the insulator in the axial direction. In the assembling step, whether or not the insulator is cracked in the assembling step is judged by detecting acoustic emission from the insulator. | 03-06-2014 |
20140134912 | SPARK 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. | 05-15-2014 |
20140194026 | MANUFACTURING METHOD OF MAIN METAL FITTING FOR SPARK PLUG AND MANUFACTURING METHOD OF SPARK PLUG - A metallic shell extends in the direction of an axial line and has a threaded portion on its outer circumferential surface for threading engagement with a mounting hole of a combustion apparatus. A process of manufacturing the metallic shell includes a step of forming a metallic shell tubular intermediate having the first tubular portion and the second tubular portion and a rolling step of forming the threaded portion on the metallic shell tubular intermediate. In the rolling step, a bearing member is inserted into the metallic shell tubular intermediate for nipping the metallic shell tubular intermediate in cooperation with working surfaces of the rolling dies, and rolling is performed simultaneously on at least the first tubular portion and the second tubular portion. | 07-10-2014 |
20150111458 | Composite Spark Plug - A composite ignition device includes a positive electrode having a tip formed thereon that is bonded to a first insulator to form a firing cone assembly. A second insulator having a negative capacitive element embedded therein is attached to the firing cone assembly. A positive capacitive element is disposed in the second insulator and is separated from the negative capacitive element by the second insulator. The positive capacitive element is coupled to the positive electrode. The positive and negative capacitive elements form a capacitor. A resistor is coupled to the positive capacitive element. An electrical connector is coupled to the resistor and attached to the second insulator. A shell including a negative electrode having a tip is attached to the second insulator and the firing cone assembly and coupled to the negative capacitive element. The negative electrode tip is spaced apart from the positive electrode tip. | 04-23-2015 |
20150340847 | MANUFACTURING METHOD OF SPARK PLUG - A manufacturing method for manufacturing a spark plug including a rod-shaped center electrode extending in an axial direction, an insulator having a tubular shape having an axial hole and holding the center electrode in the axial hole, a metal shell having a tubular shape having an end surface and an inner peripheral surface, a gap being formed between a leading end side of the insulator and the inner peripheral surface, and a ground electrode welded to the end surface, the manufacturing method including welding the ground electrode to the end surface, and removing welding sag, which is formed inside the metal shell by the welding, by causing a tip end portion of a linear member to come into contact with the welding sag while rotating a tool in which a base end portion of the linear member is fixed. | 11-26-2015 |
20160141842 | METHOD OF MANUFACTURING AN IGNITION PLUG - A method for producing a spark plug for internal combustion engines, having a metallic shell, a ceramic insulator held in the shell, a center electrode embedded in the insulator, and a ground electrode implemented as a bridge attached to the front end of the shell, wherein an end piece made of a precious metal is attached to the front end of the center electrode and a counterpart is attached to the bridge opposite the end piece, between which is formed a spark gap. A cylindrical body made fully or partially of the precious metal or precious metal alloy intended for the end piece and that is longer than the end piece is welded onto the front end of the center electrode. A bridge is used that has, in the center, a hole, the cross-section of which is matched to the cross-section of the cylindrical body. The bridge is placed on the front end of the shell in such a manner that the forward-facing end of the cylindrical body enters the hole in the bridge. The cylindrical body is welded to the bridge, and lastly the spark gap is created by cross-cutting the cylindrical body. | 05-19-2016 |
20160380411 | METHOD OF MANUFACTURING SPARK PLUG - A method of manufacturing a spark plug includes a step (a) of chucking, by mutually facing chucks, a metallic shell extending along its center axis so as to fix the metallic shell, and (b) a step of pressing a ground electrode against the fixed metallic shell and applying voltage between the ground electrode and the chucks for resistance-welding the ground electrode and the metallic shell. A first chuck facing a second chuck, wherein, as viewed on an imaginary plane of projection perpendicular to the center axis, the number of support points on the second chuck is smaller than the number of support points on the first chuck for supporting the metallic shell. | 12-29-2016 |