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公开(公告)号：US20230062977A1
公开(公告)日：2023-03-02
申请号：US17789909
申请日：2021-05-21
发明人： Daisuke MISHIMA
摘要： This spark plug inhibits excessive increase in the temperature of a ground electrode to inhibit occurrence of pre-ignition. The spark plug includes: an insulator in which an axial hole extending in an axial line direction is formed; a center electrode disposed at a front end in the axial line direction of the axial hole and having a front end portion that protrudes from a front side of the axial hole; a tubular metal shell holding the insulator; and a ground electrode having one end portion that is fixed to a through hole provided in the metal shell, the ground electrode further having another end portion that forms a discharge gap between the other end portion and the front end portion of the center electrode. The through hole extends toward the front side in the axial line direction, in a direction from an outer peripheral surface toward an inner peripheral surface of the metal shell. The one end portion is located on a rear side relative to the other end portion in the axial line direction.
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公开(公告)号：US11367999B2
公开(公告)日：2022-06-21
申请号：US16953489
申请日：2020-11-20
申请人： DENSO CORPORATION
发明人： Masataka Deguchi
摘要： A spark plug has a central electrode and a ground electrode. The central electrode has an electrode base material part and a noble metal chip of a cylindrical shape and is welded on the electrode base material part. A spark discharge is generated between the noble metal chip of the central electrode and the ground electrode when supplying a predetermined voltage to the spark plug. An intermediate region is formed on an overall surface between the electrode base material part and the noble metal chip. The intermediate region has a primary measurement part and a secondary measurement part. Components of the noble metal chip in the primary measurement area have a first average ratio of not less than 40 wt %, and components of the noble metal chip in the secondary measurement area have a second average ratio of not more than 80 wt %.
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公开(公告)号：US20220166196A1
公开(公告)日：2022-05-26
申请号：US17437679
申请日：2019-11-17
发明人： Takashi SEKIZAWA , Tomokatsu KASHIMA , Yuya ONO , Yuki TOUMATSU , Yudai KAWAGUCHI , Kazuyoshi TORII
摘要： A spark plug that can reduce variation in a discharge point. The spark plug includes: a center electrode; a metal shell insulating and holding the center electrode; and a ground electrode including a base material having one end portion connected to the metal shell, and a tip connected to another end portion of the base material. The tip has a discharge surface opposed to the center electrode with a spark gap therebetween. The discharge surface has a quadrangular shape and is chamfered at four sides thereof. Only a first side which is one of the four sides is provided with a C chamfer.
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公开(公告)号：US20220059998A1
公开(公告)日：2022-02-24
申请号：US17383616
申请日：2021-07-23
发明人： Ryo HIOKI
IPC分类号： H01T13/32
摘要： A spark plug is provided with a center electrode and a ground electrode. The ground electrode includes an electrode tip, an electrode base material, an intermediate member and a first melt portion. The intermediate member is disposed between the electrode tip and the electrode base material. The first melt portion contains components of the electrode base material and the intermediate member, and is disposed at least at a part of the boundary between the electrode base material and the intermediate member. In a cross section including the axis of the ground electrode, the boundary line between the intermediate member and the first melt portion has at least two first projection portions projecting toward the electrode tip side, and the boundary line between the electrode base material and the first melt portion has at least two second projection portions projecting toward the opposite side of the first projection portions.
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公开(公告)号：US10985535B2
公开(公告)日：2021-04-20
申请号：US16936778
申请日：2020-07-23
申请人： DENSO CORPORATION
发明人： Hiroshi Araki , Naoto Hayashi , Hikaru Takashima
摘要： In a method for manufacturing a spark plug, a space on a proximal end side of a center electrode in a shaft hole of an insulator is filled with first electrically conductive glass powder. A space on the proximal end side of the first electrically conductive glass powder in the shaft hole is filled with resistor composition powder. A space on the proximal end side of the resistor composition powder in the shaft hole is filled with second electrically conductive glass powder. The first electrically conductive glass powder, the resistor composition powder, and the second electrically conductive glass powder are sintered in the shaft hole. Prior to filling of the resistor composition powder, at least one of the insulator and the first electrically conductive glass powder is placed in an uncharged state, or the insulator and the first electrically conductive glass powder are placed in the same charged state.
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公开(公告)号：US10951012B2
公开(公告)日：2021-03-16
申请号：US16924779
申请日：2020-07-09
申请人： DENSO CORPORATION
发明人： Akimitsu Sugiura
摘要： A spark plug has a specific direction orthogonal to an axial direction of a spark plug; the specific direction has opposing front directional side and rear directional side; the housing has a tip surface having a front end in the front side of the specific direction and a rear end in the rear side, the tip surface has a tip inclined surface inclined toward the tip end of the spark plug from the front end to the rear end of the tip surface. The tip inclined surface has a rear end in the specific direction, the insulator having a front end of the specific direction, the rear end is located to be closer to the tip end of the spark plug than the front end of the tip surface is, and to be more rearward than the front end of the insulator in the rear side of the specific direction.
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公开(公告)号：US10923886B2
公开(公告)日：2021-02-16
申请号：US16763601
申请日：2019-01-18
发明人： Kei Takahashi , Daisuke Kasahara
摘要： A spark plug includes: a central electrode extending from a front end side to a rear end side along an axis; an insulator including a front end section formed to be a bottomed tube surrounding a tip of the central electrode; a metal shell shaped to be tubular and structured to support the insulator such that the front end section of the insulator projects to the front end side from a front end section of the metal shell; and a plurality of ground electrodes each of which includes a first end forming a discharge gap with the front end section of the insulator and includes a second end connected to the front end section of the metal shell. The plurality of ground electrodes include a pair of ground electrodes different from each other in size of their discharge gaps.
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公开(公告)号：US10910796B2
公开(公告)日：2021-02-02
申请号：US16868852
申请日：2020-05-07
发明人： Tatsuya Gozawa
摘要： A spark plug includes: a center electrode; a ground electrode that is provided such that a gap for spark discharge is formed between the center electrode and the ground electrode; and a plug cover covering the center electrode and the ground electrode from a front side to form an auxiliary chamber, the plug cover being provided with a through hole, wherein 60% or more of the auxiliary chamber is present in a sphere. The sphere t has a center at a midpoint of a line segment connecting the center electrode and the ground electrode at a shortest distance on an axial line of the center electrode and is in contact with a point located closest from the center on an inner open end of the through hole is imagined.
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公开(公告)号：US20210021106A1
公开(公告)日：2021-01-21
申请号：US16931897
申请日：2020-07-17
申请人： DENSO CORPORATION
摘要： A spark plug has a housing of a cylindrical shape and an insulator supported to an inside of the housing. A channel part is formed at a distal end side of the housing. The channel part is open so that the inside of the housing communicates with an outside of the housing through the channel part. The channel part has a channel bottom having a tapered shape oblique relative to a plug central axis. An overall channel bottom is arranged in the housing closer to a proximal end side than to the distal end side of the housing.
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公开(公告)号：US10897123B2
公开(公告)日：2021-01-19
申请号：US16844236
申请日：2020-04-09
申请人： DENSO CORPORATION
发明人： Nobuo Abe
摘要： A spark plug includes a center electrode held inside an insulator, a ground electrode that is provided on a housing holding the insulator and faces the center electrode, and a composite chip formed on at least one of the electrodes. In the composite chip, a core having a mount integral with an electrode base material is formed from a Ni alloy material, and a surface layer having a discharge portion covering a protrusion end surface of the core and a side surface coating covering a side surface is formed from a Pt alloy material. The coating thickness S of the side surface coating in the radial direction, the outer diameter D1 of the discharge portion, and the coating length L1 of the side surface coating in the axial direction satisfy: S≥D1/20+L1/10−0.005 mm.
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