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公开(公告)号：US20170077679A1
公开(公告)日：2017-03-16
申请号：US15266072
申请日：2016-09-15
申请人： DENSO CORPORATION
发明人： Masataka DEGUCHI , Masamichi SHIBATA , Kanechiyo TERADA , Tetsuya MIWA , Hironori OSAMURA , Yuuki TSUKAMOTO
摘要： A spark plug for an internal combustion engine is provided which includes a housing, a porcelain insulator, a center electrode, and an annular ground electrode. The housing has a small-diameter portion which has a smaller inner diameter and defines a front end thereof. The ground electrode is secured to a front end surface of the small-diameter portion and forms a spark gap between itself and an outer periphery of the center electrode. A pocket is formed between the inner periphery of the housing and a portion of the porcelain insulator which is located closer to a front end of the porcelain insulator than the mounting shoulder is. An air vent extends from outside the ground electrode in a radial direction of the spark plug to the pocket to establish communication between the pocket and the combustion chamber of the internal combustion engine.
摘要翻译： 提供了一种用于内燃机的火花塞，其包括壳体，瓷绝缘体，中心电极和环形接地电极。 壳体具有小直径部分，其具有较小的内径并限定其前端。 接地电极被固定到小直径部分的前端表面，并且在其自身与中心电极的外周之间形成火花隙。 在壳体的内周和陶瓷绝缘体的比安装肩部更靠近瓷绝缘体的前端的部分之间形成有口袋。 排气孔从火花塞的径向方向从接地电极的外部延伸到口袋，以在内燃机的口袋和燃烧室之间建立连通。
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公开(公告)号：US20210203135A1
公开(公告)日：2021-07-01
申请号：US17132331
申请日：2020-12-23
申请人： DENSO CORPORATION
发明人： Masamichi SHIBATA , Hiroshi NAKAO
摘要： In a spark plug, a noble metal tip includes an Ir-alloy material and has a circular-columnar shape that has a predetermined outer diameter and is formed by the Ir-alloy material being stretched. The spark plug generates discharge between the noble metal tip and a ground electrode that is arranged to oppose an outer peripheral surface of the noble metal tip. The Ir-alloy material includes crystal grains of an Ir alloy having an average aspect ratio that is adjusted to be equal to or greater than 1.3 and equal to or less than 4.8. The average aspect ratio is an average value of aspect ratios of the crystal grains each being a value obtained by a length of the respective crystal grains in an axial direction of the noble metal tip being divided by a length of the respective crystal grains in a direction perpendicular to the axial direction.
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公开(公告)号：US20210021105A1
公开(公告)日：2021-01-21
申请号：US16931782
申请日：2020-07-17
申请人： DENSO CORPORATION
IPC分类号： H01T13/32
摘要： A spark plug has a housing, an insulator, a central electrode and a ground electrode. At least one projection part is formed on an outer peripheral surface of the insulator at a location facing a distal end cylindrical surface of the insulator in a radial direction of the spark plug so that at least one projection part has a minimum distance measured from a plug central axis of the spark plug, which is longer than a distance of another part of the insulator measured from the plug central axis. On a cross section of the spark plug, at least one projection part is formed on the outer peripheral surface of the insulator in a direction between at least one projection part and the plug central axis which crosses to a direction between a rod-shaped part and the plug central axis.
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公开(公告)号：US20190386467A1
公开(公告)日：2019-12-19
申请号：US16551912
申请日：2019-08-27
申请人： DENSO CORPORATION
发明人： Noriaki NISHIO , Masamichi SHIBATA , Kanechiyo TERADA , Ken HANASHI , Ryohei AKIYOSHI , Fumiaki AOKI
IPC分类号： H01T13/32
摘要： A center electrode is held in insulating glass, in which a tip end portion of the center electrode protrudes. A ground electrode has a connection part connected to a housing. The ground electrode forms a spark discharge gap between the center electrode and the ground electrode. The ground electrode has a ground base material that includes the connection part and a ground protrusion part that protrudes from the ground base material toward the center electrode and forms the spark discharge gap between the center electrode and the ground electrode. An angle between a ground discharge surface of the ground protrusion part and a side surface of the ground protrusion part is a right angle or an acute angle. At least a portion of the side surface of the ground protrusion part and at least a portion of a side surface of the ground base material are flush with each other.
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公开(公告)号：US20190319433A1
公开(公告)日：2019-10-17
申请号：US16453016
申请日：2019-06-26
申请人： DENSO CORPORATION
发明人： Masamichi SHIBATA
摘要： An ignition plug includes a main metal fitting; an earth electrode having one end fixed to the main metal fitting and including, in a part of the other end, an inclined portion inclined toward the center axis line of the main metal fitting; an earth electrode-side chip joined to the inclined portion; and a center electrode having one end exposed from the main metal fitting. The ignition plug includes: a pedestal which has an elliptic cylindrical shape, is disposed so as to have a minor axis directed toward the earth electrode-side chip, and has an end surface forming an inclined surface inclined along the minor axis with respect to the center axis line; and a center electrode-side chip laser-welded to the inclined surface. The earth electrode-side chip and the center electrode-side chip face each other.
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公开(公告)号：US20180309270A1
公开(公告)日：2018-10-25
申请号：US15768106
申请日：2016-09-09
申请人： DENSO CORPORATION
发明人： Masamichi SHIBATA
摘要： In a spark plug for an internal combustion engine, an insulator is held inside a housing such that a proximal end thereof projects in an axial direction. A center electrode is held inside the insulator such that a distal end thereof projects. A terminal fitting is connected to the proximal end of the insulator and provided such that electricity is conducted between the center electrode and the terminal fitting. A ground electrode forms a spark discharge gap between the distal end of the center electrode and the ground electrode. A first gap is formed between the proximal end of the insulator and the terminal fitting, a second gap is formed between a proximal end of the housing and the insulator, and at least one of the first gap and the second gap is filled with a filler.
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公开(公告)号：US20170194769A1
公开(公告)日：2017-07-06
申请号：US15304941
申请日：2015-04-15
申请人： DENSO CORPORATION
发明人： Aki MIYAWAKI , Atsushi HONDA , Syoichi TAKEMOTO , Akihiro ANDO , Takanobu AOCHI , Masamichi SHIBATA
摘要： A spark plug 5 for an internal combustion engine includes a center electrode 1, an insulator 2, and a housing 3. The insulator 2 includes a distal end side exposed part and an insulator enlarged diameter part 21. The housing 3 includes a lateral electrode 32, an engaging part 33, and a crimping portion 35. A buffer member 4 that restrains the distal end side exposed part 20 by pressing a part of the distal end side exposed part 20 toward the center and a part of the inner peripheral surface of the lateral electrode 32 in a radial direction at a distal end side of the engaging part 33 is disposed at a base end side of the gas pocket 230.
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公开(公告)号：US20210039277A1
公开(公告)日：2021-02-11
申请号：US16985469
申请日：2020-08-05
申请人： DENSO CORPORATION
发明人： Masamichi SHIBATA
摘要： A method of producing a cylindrical insulator for a spark plug includes a molding step of forming ceramic powder filled in a cavity defined by a mold and a molding pin into a compact. In a first removal step of removing the compact from the mold, the compact has at least one protrusion formed in at least one recess of the molding pin formed in an outer cylindrical surface of the molding pin, and the at least one protrusion is locked in the at least one recess, thereby allowing the compact to be removed with the molding pin from the mold. In a second removal step of removing the molding pin from the compact, the molding pin is turned or rotated in the circumferential direction about the compact, causing the at least one recess to cut the at least one protrusion from the compact, and thereafter the molding pin is removed from the compact.
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公开(公告)号：US20200343697A1
公开(公告)日：2020-10-29
申请号：US16927043
申请日：2020-07-13
申请人： DENSO CORPORATION
发明人： Daisuke SHIMAMOTO , Yuya ABE , Masamichi SHIBATA
摘要： A spark plug includes a ground electrode facing a distal end surface of a center electrode. In a main body of the ground electrode, a first slanted surface is formed at a portion on a side facing the distal end surface and upstream of the center electrode relative to the airflow, a facing portion, a second slanted surface is formed at a portion on a side opposite to the side facing the distal end surface and upstream of the center electrode relative to the airflow, and when T represents a thickness of the main body of the ground electrode and Su represents a distance from a connection between the first slanted surface and the second slanted surface to the facing portion, 2T/16≤Su≤8T/16.
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公开(公告)号：US20180109079A1
公开(公告)日：2018-04-19
申请号：US15564876
申请日：2016-04-07
申请人： DENSO CORPORATION
发明人： Kenji HATTORI , Kaori DOI , Masamichi SHIBATA , Tetsuya MIWA
摘要： In an ignition coil for an internal combustion engine, a spark plug is incorporated which has an insulator including an insulator head that has no corrugation. The ignition coil has a coil body part generating high voltage and a joint part, which holds therein a conducting member electrically connecting the coil body part and a spark plug. The joint part has a plug cap into which the insulator head of the spark plug is inserted and which is formed of an elastic member having a cylindrical shape. The plug cap has a close-contact part whose inner peripheral surface is closely brought into contact with an outer peripheral surface of the insulator. The close-contact part has a tip end-side close-contact part positioned at a tip end side with respect to a middle position in an axial direction, and a base end-side close-contact part positioned at a base end side with respect to the middle position. At least part of the base end-side close-contact part is provided with a strong strained force part that has strained force for fastening the insulator head, the strained force being stronger than strained force of all portions of the tip end-side close-contact part.
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