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公开(公告)号：US20190214795A1
公开(公告)日：2019-07-11
申请号：US16088971
申请日：2017-03-24
申请人： DENSO CORPORATION
发明人： Masayuki TAMURA , Nobuo ABE , Masamichi SHIBATA
摘要： An ignition plug for an internal combustion engine includes an electrode protrusion that protrudes from an electrode base material of a ground electrode toward a discharge gap. The electrode protrusion has a base part that is integrated with the electrode base material and a cover part that is joined to the base part and faces the discharge gap. The base part has an end surface facing a protrusion direction of the base part and a side peripheral surface. An outer edge of the end surface has a curved surface. The cover part is formed from a precious metal or a precious metal alloy having a lower linear expansion coefficient than that of a material for forming the base part and covers at least a part of the side peripheral surface and the end surface of the base part. While the ignition plug is attached to an internal combustion engine and the electrode protrusion is heated and then cooled, a projection is formed on an outer surface of a portion covering the side peripheral surface of the base part.
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公开(公告)号：US20190115729A1
公开(公告)日：2019-04-18
申请号：US16156337
申请日：2018-10-10
摘要： A spark plug having a resistor disposed between a metal terminal and a center electrode so as to be electrically connected to the metal terminal and the center electrode, wherein the resistor is in contact with an inner circumferential surface of the insulator. On a cross section taken along the axial line so as to include the axial line, in a case where a plurality of points are plotted at predetermined intervals in a direction of the axial line so as to be present on a partial boundary line, within an arbitrary range in the direction of the axial line, of a boundary line between the insulator and the resistor, and a regression line is drawn by a least-squares method with use of the plurality of points, an average value of distances in a direction perpendicular to the regression line between the regression line and the partial boundary line is 0.1 to 0.3 μm.
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公开(公告)号：US20180309269A1
公开(公告)日：2018-10-25
申请号：US16019901
申请日：2018-06-27
申请人： FEDERAL-MOGUL LLC
IPC分类号： H01T13/06 , H01T21/02 , H01T19/04 , H01T19/00 , H01T13/50 , H01T13/44 , H01T13/04 , F02P23/04 , H01T13/08
CPC分类号： H01T13/06 , F02P23/04 , H01T13/04 , H01T13/08 , H01T13/44 , H01T13/50 , H01T19/00 , H01T19/04 , H01T21/02 , Y10T29/49002
摘要： A corona igniter assembly 20 comprises an ignition coil assembly 22, a firing end assembly 24, and a metal tube 26 connecting the ignition coil assembly 22 to the firing end assembly 24. A rubber boot 28 is disposed in the metal tube 26 and compressed symmetrically between a coil output member 30 of the ignition coil assembly 22 and an insulator 42 of the firing end assembly 24. Thus, the rubber boot 28 fills any air gaps and provides a hermetic seal between the ignition coil assembly 22 and the firing end assembly 24 to prevent unwanted corona discharge from forming from those air gaps.
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4.发明申请公开(公告)号：US20180274514A1
公开(公告)日：2018-09-27
申请号：US15935540
申请日：2018-03-26
申请人： FEDERAL-MOGUL LLC
发明人： Kristapher I. MIXELL , Yusuf Esmail NEEMUCHWALA , John E. MILLER , James D. LYKOWSKI , John Antony BURROWS
CPC分类号： F02P23/04 , F02P3/01 , H01F27/306 , H01F27/321 , H01F38/12 , H01T13/44 , H01T13/50 , H01T13/56 , H01T19/02 , H01T21/02
摘要： An igniter assembly comprising an ignition coil assembly connected to a firing end assembly by an extension, with a valve assembly disposed in a pressure chamber of the extension, is provided. The valve assembly includes a valve stem biased toward the ignition coil assembly by a spring to seal the pressure chamber. The valve assembly is used to evacuate contents from the pressure chamber by pressing the valve stem toward the spring and allowing contents of the pressure chamber to travel through and past the valve stem and out of the pressure chamber. The valve assembly is also used to fill the pressure chamber with an insulating medium by pressing the valve stem toward the spring and allowing the insulating medium to travel through and past the valve stem and into the pressure chamber after evacuating the contents out of the pressure chamber.
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公开(公告)号：US20180166863A1
公开(公告)日：2018-06-14
申请号：US15577389
申请日：2016-05-16
摘要： A spark plug having a tip provided on at least one of a center electrode and a ground electrode. The tip includes a body portion, a coating layer, and a high specific resistance layer. The body portion contains mostly Ir. The high specific resistance layer is provided on a side peripheral surface of the body portion, has a Ni content greater than the Ni content of the body portion and less than 50 mass %, and has a thickness of 2 μm or greater and 45 μm or less. The coating layer is provided on a side peripheral surface of the high specific resistance layer, contains 50 mass % or more of Ni, and has a thickness of 3 μm or greater and 20 μm or less. The tip has a specific resistance of 20×10−8 Ωm or less at room temperature.
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公开(公告)号：US20180159304A1
公开(公告)日：2018-06-07
申请号：US15828927
申请日：2017-12-01
申请人： DENSO CORPORATION
发明人： Masayuki TAMURA , Yuji KAJI , Yoshinori DOI , Shinya TANAKA , Atsushi YOSHIDA
摘要： A pipe material used as a discharge electrode of a spark plug for an internal combustion engine comprises an outer layer made of a Ni-based alloy, an inner layer made of a Pt-based alloy provided inside the outer layer, and an intermediate layer provided between the outer layer and the inner layer.
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公开(公告)号：US09966737B1
公开(公告)日：2018-05-08
申请号：US15715349
申请日：2017-09-26
发明人： Shunsuke Maki
摘要： Disclosed is a method for manufacturing a spark plug in which a tip is welded to a ground electrode. After the tip is welded to a distal end portion of the ground electrode, polishing treatment or grinding treatment is performed on at least a part of an edge region of a distal end face of the ground electrode. After the polishing or grinding treatment, an image of the distal end face of the ground electrode and the tip is taken with the use of reflected light and then analyzed by image processing.
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公开(公告)号：US20180069379A1
公开(公告)日：2018-03-08
申请号：US15693660
申请日：2017-09-01
摘要： A method for producing a spark plug, including an inspection step for an insulator includes: (a) a step of preparing an assembly; (b) a step of attaching the assembly to a pressure vessel; (c) a step of attaching an insulating member to the assembly so as to cover at least a part of a surface of a portion of the insulator that is exposed at the rear side; and (d) a step of pressurizing an interior of the pressure vessel and applying a predetermined voltage between the metal terminal and the metal shell. The producing method further includes a step of adhering a lubricant to at least one of a surface of the insulator and an inner surface of the insulating member.
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公开(公告)号：US20180062357A1
公开(公告)日：2018-03-01
申请号：US15692254
申请日：2017-08-31
申请人： DENSO CORPORATION
发明人： Ryohei AKIYOSHI , Ken HANASHl , Tomoyuki WATANABE
摘要： Disclosed herein is a spark plug capable of suppressing electrode consumption caused by a spark discharge and a method of manufacturing the same. A section except a welded section formed by welding a tip surface of a center electrode is defined as an unwelded section in side surfaces of a center chip, and a length of the unwelded section along a center axis of the center chip is defined as an unwelded section length. Under this definition, the welded section is formed in order for an unwelded section length in a side surface opposite to an inclination direction side of the center chip in the center chip to become longer than an unwelded section length in a side surface of the inclination direction side of the center chip in the center chip.
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公开(公告)号：US20180054044A1
公开(公告)日：2018-02-22
申请号：US15661349
申请日：2017-07-27
发明人： Takafumi UMEMURA , Kouji KAMIKAWA , Tomoki KAWAI
摘要： A center electrode including an electrode base member having a cylindrical shape with a bottom and a core member embedded in the electrode base member. The core member has a thermal conductivity higher than that of the electrode base member. The center electrode includes a plurality of shoulder portions which each include a diameter reducing portion having a diameter that decreases toward a front end of the spark plug in a direction of an axial line, an outer side surface that extends in the direction of the axial line, and an edge disposed between the diameter reducing portion and the outer side surface, One of the shoulder portions closest to an inner surface of the axial hole has a cutting mark that extends in a circumferential direction over a region from the diameter reducing portion to the edge.
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