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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
Applicant: DENSO CORPORATION
Inventor： Yoshihiro IZUMI , Masamichi SHIBATA , Kanechiyo TERADA , Tetsuya MIWA
Abstract: 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：US20190120198A1
公开(公告)日：2019-04-25
申请号：US16166542
申请日：2018-10-22
Applicant: DENSO CORPORATION
Inventor： Keiko MIYAKE , Shunichi TAKEDA , Kanechiyo TERADA , Tetsuya MIWA
Abstract: In an ignition apparatus, a controller outputs a discharge start signal instructing a start of a discharge in the spark plug, and a discharge control signal instructing control of a discharge current in the spark plug after the start of the discharge. A signal line connects between the controller and a control circuit. The discharge start signal and the discharge control signal are transferred from the controller to the control circuit via the signal line. The controller modulates, based on the plural command values, the discharge control signal such that the modulated discharge control signal includes information representing the plural command values and change timings for the respective command values. The control circuit controls, based on the discharge start signal and the modified discharge control signal, the energization circuit to thereby adjust the discharge current to each of the command values at a corresponding one of the change timings.
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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
Applicant: DENSO CORPORATION
Inventor： Kenji HATTORI , Kaori DOI , Masamichi SHIBATA , Tetsuya MIWA
Abstract: 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：US20230093588A1
公开(公告)日：2023-03-23
申请号：US18071957
申请日：2022-11-30
Applicant: DENSO CORPORATION
Inventor： Norihiro ADACHI , Kanechiyo TERADA , Tetsuya MIWA
Abstract: An ignition coil for an internal combustion engine includes a primary bobbin including a winding cylinder part and a connection part between the winding cylinder part and a connector part, a primary coil including a primary main coil and a primary sub coil, and a secondary coil. When one of the primary main coil and the primary sub coil that includes an innermost coil part around the winding cylinder part is defined as a firstly-wound coil and the other is defined as a secondly-wound coil, firstly-wound ends, which are ends of the firstly-wound coil, and secondly-wound ends, which are ends of the secondly-wound coil, are attached to the connection part, and a shortest distance from a central axis of the winding cylinder part to each of the firstly-wound ends is smaller than a shortest distance from the central axis of the winding cylinder part to each of the secondly-wound ends.
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公开(公告)号：US20200099198A1
公开(公告)日：2020-03-26
申请号：US16582430
申请日：2019-09-25
Applicant: DENSO CORPORATION
Inventor： Yuuki KAWATA , Fumiaki AOKI , Daisuke TANAKA , Ryota WAKASUGI , Kanechiyo TERADA , Tetsuya MIWA , Akimitsu SUGIURA
Abstract: In a spark plug for an internal combustion engine, a discharge gap is formed between a central electrode and a ground electrode in an axial direction of the spark plug. An insulator of a cylindrical shape has an axial hole and an insulator front end part. The axial hole is formed in the insulator, into which the central electrode is arranged and supported. The insulator front end part projects further toward a front side of the insulator in the axial direction of the spark plug than a location of an opening part formed at a front end side of the axial hole. The discharge gasp is formed in an auxiliary combustion chamber. The outer peripheral side of the auxiliary combustion chamber is covered with the insulator front end part.
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Patent Agency Ranking
公开(公告)号：US20230395318A1
公开(公告)日：2023-12-07
申请号：US18449742
申请日：2023-08-15
Applicant: DENSO CORPORATION
Inventor： Norihiro ADACHI , Kanechiyo TERADA , Tetsuya MIWA
CPC classification number: H01F38/12 , F02P3/02 , F02P13/00 , H01F2038/122
Abstract: An ignition coil for an internal combustion engine includes a primary bobbin including a winding cylinder part and a connection part between the winding cylinder part and a connector part, a primary coil including a primary main coil and a primary sub coil, and a secondary coil. When one of the primary main coil and the primary sub coil that includes an innermost coil part around the winding cylinder part is defined as a firstly-wound coil and the other is defined as a secondly-wound coil, firstly-wound ends, which are ends of the firstly-wound coil, and secondly-wound ends, which are ends of the secondly-wound coil, are attached to the connection part, and a shortest distance from a central axis of the winding cylinder part to each of the firstly-wound ends is smaller than a shortest distance from the central axis of the winding cylinder part to each of the secondly-wound ends.
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公开(公告)号：US20200112144A1
公开(公告)日：2020-04-09
申请号：US16590653
申请日：2019-10-02
Applicant: DENSO CORPORATION
Inventor： Yuuki KAWATA , Fumiaki AOKI , Daisuke TANAKA , Ryota WAKASUGI , Akimitsu SUGIURA , Kanechiyo TERADA , Tetsuya MIWA
Abstract: A spark plug for an internal combustion engine includes a housing, an insulator, and a center electrode. The center electrode includes an inside electrode portion and an outside electrode portion. The housing includes a ground electrode projecting from a distal end portion of the housing toward the distal end side of the plug at a part in a plug circumferential direction. The outside electrode portion projects along a surface of the insulator tip in a direction away from a boundary with the inside electrode portion and includes a projection, which is capable of causing an electrical discharge between the ground electrode and the outside electrode portion. The projection is formed in a region in the plug circumferential direction. The projection and the ground electrode are located at positions different from each other in the plug circumferential direction.
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公开(公告)号：US20200036165A1
公开(公告)日：2020-01-30
申请号：US16520392
申请日：2019-07-24
Applicant: DENSO CORPORATION
Inventor： Ryota WAKASUGI , Fumiaki AOKI , Daisuke TANAKA , Akimitsu SUGIURA , Tetsuya MIWA , Kanechiyo TERADA
IPC: H01T13/20
Abstract: In a spark plug for an internal combustion engine, a cylindrical insulator is arranged radially inside a cylindrical ground electrode, and includes an insulator protruding portion protruding further toward a distal end side in an axial direction than a distal end of the ground electrode. A center electrode is held radially inside the insulator, and includes an exposed portion exposed from a distal end of the insulator protruding portion. The spark plug generates a discharge from the exposed portion to the ground electrode, in a discharge gap formed along a surface of the insulator protruding portion. At least one of the exposed portion and the insulator protruding portion includes a flow inlet that is open on an outer circumferential surface thereof, a flow outlet that is open toward the discharge gap, and a communication passage communicating between the flow inlet and the flow outlet.
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公开(公告)号：US20200028333A1
公开(公告)日：2020-01-23
申请号：US16584998
申请日：2019-09-27
Applicant: DENSO CORPORATION
Inventor： Shintaro ITOH , Daisuke TANAKA , Akimitsu SUGIURA , Ryota WAKASUGI , Kaori DOI , Kanechiyo TERADA , Tetsuya MIWA , Fumiaki AOKl
Abstract: A spark plug has a tubular ground electrode, an insulator, and a center electrode. The insulator has an insulator protruding portion protruding to a tip end side in a plug axial direction with respect to the ground electrode. The center electrode 4 has an exposed portion exposed through a tip end of the insulator protruding portion. The exposed portion of the center electrode has a first part covering the insulator protruding portion from the tip end side in the plug axial direction, and a second part extending from the first part to a base end side in the plug axial direction and covering the entire circumference of an outer peripheral surface of the insulator protruding portion from an outer peripheral side in a plug radial direction.
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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
Applicant: DENSO CORPORATION
Inventor： Masataka DEGUCHI , Masamichi SHIBATA , Kanechiyo TERADA , Tetsuya MIWA , Hironori OSAMURA , Yuuki TSUKAMOTO
Abstract: 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.
Abstract translation: 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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