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公开(公告)号：US10530132B2
公开(公告)日：2020-01-07
申请号：US16381089
申请日：2019-04-11
申请人： DENSO CORPORATION
发明人： Kenji Hattori , Ryuichi Ohno
摘要： A spark plug includes: a cylindrical mounting bracket attachable to an internal combustion engine; a center electrode that is held by the mounting bracket in an insulated manner and has a first end portion exposed and extended from a first end portion of the mounting bracket; a ground electrode that has a first end side joined to the first end portion of the mounting bracket and has a surface of the second end side extended to be opposed to the first end portion of the center electrode; a convex portion that protrudes from a base material of the ground electrode on the surface of the ground electrode toward the center electrode, has a surface protruded outward, and has surfaces without corners; and a precious metal layer formed on the surface of the convex portion.
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公开(公告)号：US10305258B2
公开(公告)日：2019-05-28
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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公开(公告)号：US09948067B2
公开(公告)日：2018-04-17
申请号：US15695232
申请日：2017-09-05
申请人： DENSO CORPORATION
发明人： Masamichi Shibata , Ryuichi Ohno , Kenji Hattori
摘要： A spark plug for an internal combustion engine includes a cylindrical metal shell, a center electrode, and a ground electrode. The center electrode has an end portion which protrudes outside an end of the metal shell. The ground electrode is joined at an end thereof to the metal shell and has an inner surface facing the end portion of the center electrode. The ground electrode has a maximum width W meeting a relation of 1.3≤W≤2.0. A distance d between the center of an end surface of the center electrode and the inner surface of the ground electrode on a plane extending through the center of the center electrode perpendicular to an axis of the spark plug is selected to meet a relation of W+0.525≤d≤1.07W+0.66. This ensures the stability of ignitability of the spark plug.
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公开(公告)号：US10541517B2
公开(公告)日：2020-01-21
申请号：US16381099
申请日：2019-04-11
申请人： DENSO CORPORATION
发明人： Kenji Hattori , Teiji Ishinada , Ryuichi Ohno
摘要： A spark plug includes: a mounting bracket; a center electrode having a first end portion exposed and extended from first end portion of the mounting bracket; a slant-shape ground electrode that has first end side joined to the first end portion of the mounting bracket, has a surface of the second end side extended to be opposed to the first end portion of the center electrode, and has an extension direction inclined with respect to the center electrode; a convex portion protruding from a base material of the ground electrode on the surface thereof toward the center electrode, inclines toward the center electrode with respect to a protrusion direction, and has a convex portion opposed surface opposed to an end surface of the center electrode; and a precious metal layer formed on at least the convex portion opposed surface out of surfaces of the convex portion.
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公开(公告)号：US10291000B2
公开(公告)日：2019-05-14
申请号：US15743732
申请日：2016-07-05
申请人： DENSO CORPORATION
发明人： Akimitsu Sugiura , Kenji Hattori , Shunichi Takeda , Kaori Doi , Ryota Wakasugi
IPC分类号： F02P3/00 , H01T13/00 , H01T15/00 , F02P13/00 , F02P15/00 , H01T13/20 , F02P3/04 , H01F38/12 , H01T13/08 , H01T13/38 , H01T13/04 , H01T13/42 , H01T13/32 , F02P3/02
摘要： An ignition apparatus includes a spark plug and an ignition coil. The spark plug has a plug terminal protruding proximalward from an insulator. The ignition coil includes a coil main body, which includes a primary coil and a secondary coil, and a helical spring that electrically connects the secondary coil and the plug terminal. The plug terminal is made of a material that is both electrically conductive and magnetic. The plug terminal includes a terminal main body, which has an outer diameter greater than an inner diameter of the spring, and a terminal extension portion that has an outer diameter less than the inner diameter of the spring and extends proximalward from the terminal main body. A distal end portion of the spring abuts the terminal main body. The terminal extension portion is inserted and arranged in the spring. Between an outer circumferential surface of the terminal extension portion and an inner circumferential surface of the spring, there is interposed an insulating member.
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公开(公告)号：US09954344B2
公开(公告)日：2018-04-24
申请号：US15550458
申请日：2016-02-10
申请人： DENSO CORPORATION
发明人： Kenji Hattori , Masamichi Shibata , Toshiya Nakamura , Yasuomi Imanaka , Hirofumi Suzuki , Hiroshi Araki , Tomoyuki Watanabe , Shin Hase
摘要： A spark plug 1 includes a cylindrical housing, a cylindrical insulator, a center electrode, a terminal bracket, a ground electrode, and a resistor. The insulator is held on the inside of the housing. The center electrode 4 is held on the inside of the insulator, with a tip end being projected therefrom. The terminal bracket is held on the inside of the insulator, with a base end part and being projected therefrom. The ground electrode forms a spark discharge gap G between itself and the center electrode. The resistor contains carbon and is disposed on the inside of the insulator so as to be located between the center electrode 4 and the terminal bracket. In an axial direction X of the spark plug, the resistor has a higher carbon content in a first region positioned on a tip side, compared to a second region positioned on a base end side.
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公开(公告)号：US20180156182A1
公开(公告)日：2018-06-07
申请号：US15830441
申请日：2017-12-04
申请人： DENSO CORPORATION
发明人： Kenji Hattori , lppei Funato
CPC分类号： F02P15/08 , F02D41/0072 , F02D41/1454 , F02P3/0442 , F02P3/05 , F02P5/15 , F02P5/1516 , F02P2017/121
摘要： In an ignition control system, a primary current control unit performs discharge generation control one or more times during a single combustion cycle. The discharge generation control allows a spark plug to generate a discharge spark. A parameter calculating unit successively calculates a parameter correlated with energy of a discharge spark. An energy density calculating unit successively calculates energy density that is energy per unit length of the discharge spark. When the energy density is greater than a predetermined value during a predetermined period after a primary current is interrupted during a single combustion cycle, an integrated value calculating unit calculates an integrated value by integrating the parameter during the predetermined period. The primary current control unit performs the discharge generation control again when the integrated value calculated by the integrated value calculating unit is less than a predetermined determination threshold.
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公开(公告)号：US10132287B2
公开(公告)日：2018-11-20
申请号：US15830441
申请日：2017-12-04
申请人： DENSO CORPORATION
发明人： Kenji Hattori , Ippei Funato
摘要： In an ignition control system, a primary current control unit performs discharge generation control one or more times during a single combustion cycle. The discharge generation control allows a spark plug to generate a discharge spark. A parameter calculating unit successively calculates a parameter correlated with energy of a discharge spark. An energy density calculating unit successively calculates energy density that is energy per unit length of the discharge spark. When the energy density is greater than a predetermined value during a predetermined period after a primary current is interrupted during a single combustion cycle, an integrated value calculating unit calculates an integrated value by integrating the parameter during the predetermined period. The primary current control unit performs the discharge generation control again when the integrated value calculated by the integrated value calculating unit is less than a predetermined determination threshold.
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