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公开(公告)号：US20130199510A1
公开(公告)日：2013-08-08
申请号：US13722453
申请日：2012-12-20
Applicant: DENSO CORPORATION
Inventor： Masamichi SHIBATA , Atsuya MIZUTANI , Koichi HATTORI , Yasuomi IMANAKA
IPC: F02P1/08
CPC classification number: F02P1/083 , F02P3/02 , F02P3/0407 , F02P3/0442 , F02P3/0552 , H01T13/44
Abstract: An ignition system is provided, in which a Zener diode is connected in parallel with a spark plug, to suppress torque variation from becoming large in an engine when deterioration of the spark plug is advanced. Specifically, the ignition system includes a secondary coil having an end connected to a center electrode of the spark plug via a connecting path. The connecting path is connected to a constant-voltage path having a grounded end and including the Zener diode. The time from when an ignition signal is switched off until when ignition timing occurs is measured for a plurality of times. The difference between a maximum value and a minimum value among the plurality of measurements is defined to be a variation range. A breakdown voltage of the Zener diode is adjusted based on requirements such as for rendering the variation range to be a predetermined time or smaller.
Abstract translation: 提供了一种点火系统，其中齐纳二极管与火花塞并联连接，以在火花塞的劣化提前时抑制发动机中的扭矩变化变大。 具体来说，该点火系统包括一个次级线圈，其一端通过连接路径连接到火花塞的中心电极。 连接路径连接到具有接地端并包括齐纳二极管的恒定电压路径。 从点火信号关闭直到点火正时发生的时间被测量多次。 多个测量中的最大值和最小值之间的差定义为变化范围。 齐纳二极管的击穿电压根据要求进行调整，例如使变化范围为预定时间或更短。
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公开(公告)号：US20130199485A1
公开(公告)日：2013-08-08
申请号：US13757987
申请日：2013-02-04
Applicant: DENSO CORPORATION
Inventor： Masamichi SHIBATA , Atsuya MIZUTANI , Yasuomi IMANAKA , Koichi HATTORI
IPC: F02P17/12
CPC classification number: F02P17/12 , F02P3/0414 , F02P11/06
Abstract: A control apparatus for an ignition system of an internal combustion engine which can appropriately judge deterioration of a spark plug is disclosed. The ignition system includes a spark plug and a Zener diode. These are connected in parallel. In the ignition system, a constant-voltage path whose one of two ends is grounded is connected to the connecting path which connects the center electrode of the spark plug to a secondary coil. The constant-voltage path includes a Zener diode and a resistor. In a case where electric current is detected at the resister in a term from the start of current supply to a primary coil to the end, the control apparatus judges the spark plug being deteriorated.
Abstract translation: 公开了一种可以适当地判断火花塞的劣化的用于内燃机的点火系统的控制装置。 点火系统包括火花塞和齐纳二极管。 这些并行连接。 在点火系统中，两端接地的恒压路径连接到将火花塞的中心电极连接到次级线圈的连接路径上。 恒定电压路径包括齐纳二极管和电阻。 在从电流供应开始到初级线圈到末端的术语中，在电阻器处检测到电流的情况下，控制装置判断火花塞劣化。
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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：US20200036164A1
公开(公告)日：2020-01-30
申请号：US16509911
申请日：2019-07-12
Applicant: DENSO CORPORATION
Inventor： Yasuomi IMANAKA , Masamichi SHIBATA
Abstract: A spark plug has a spark plug housing of a cylindrical shape, an insulator of a cylindrical shape, a central electrode, a ground electrode and a terminal metal fitting. The insulator has a head part projecting toward a distal end side of the spark plug from the spark plug housing.The central electrode and the ground electrode forms a discharge gap. The terminal metal fitting, electrically connected to the central electrode, has a main body part and an exposed part. The exposed part of the terminal metal fitting has a head part. An outer diameter of the head part of the exposed part is greater than an outer diameter of the main body part. A ratio Dt/Di of not less than 0.8 is satisfied, Di represents an outer diameter of the head part of the insulator and Dt represents an outer diameter of the head part of the exposed part.
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公开(公告)号：US20190199068A1
公开(公告)日：2019-06-27
申请号：US16089479
申请日：2017-03-17
Applicant: DENSO CORPORATION
Inventor： Masamichi SHIBATA , Ryohei AKIYOSHI
Abstract: There is provided a spark plug for an internal combustion engine with a simple configuration capable of ensuring stable ignitability regardless of mounting posture to the internal combustion engine. The spark plug includes a housing, an insulator, a center electrode, and a ground electrode. The ground electrode includes an erecting part that is erected from a tip part of the housing to a tip side and an inclined part that is bent from the tip of the erecting part to the center electrode side to extend obliquely toward a tip side. An end edge of the ground electrode on an opposite side to the housing side is a tip of the inclined part. The erecting part satisfies w/t≤1, w≤1.9 mm, and t≤2.3 mm, where t is a dimension in an alignment direction of the erecting part and the center electrode, and w is a dimension in a width direction orthogonal to each of the alignment direction and a plug axial direction. An inclination angle θ of the inclined part with respect to the plug axial direction satisfies 30°≤θ≤60°.
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Patent Agency Ranking
公开(公告)号：US20190020179A1
公开(公告)日：2019-01-17
申请号：US16028569
申请日：2018-07-06
Applicant: DENSO CORPORATION
Inventor： Kazumi NAKANO , Masamichi SHIBATA
CPC classification number: H01T13/14 , H01T13/32 , H01T13/462 , H01T21/02 , H01T21/06
Abstract: A spark plug is provided which includes a cylindrical metal shell, a cylindrical porcelain insulator retained in the metal shell, a center electrode, and a ground electrode. The center electrode is disposed in the insulator with a head protruding outside a front end surface of the insulator. The ground electrode is joined to the metal shell and includes a gap-defining portion which faces a side surface of a side surface of the center electrode to define a spark gap and also faces the front end surface of the porcelain insulator to define a semi-surface discharge gap for burning off, for example, carbon deposits on the front end surface of the insulator.
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公开(公告)号：US20180069378A1
公开(公告)日：2018-03-08
申请号：US15695232
申请日：2017-09-05
Applicant: DENSO CORPORATION
Inventor： Masamichi SHIBATA , Ryuichi OHNO , Kenji HATTORI
Abstract: 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≦1.07 W+0.66. This ensures the stability of ignitability of the spark plug.
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公开(公告)号：US20180034246A1
公开(公告)日：2018-02-01
申请号：US15550458
申请日：2016-02-10
Applicant: DENSO CORPORATION
Inventor： Kenji HATTORI , Masamichi SHIBATA , Toshiya NAKAMURA , Yasuomi IMANAKA , Hirofumi SUZUKI , Hiroshi ARAKI , Tomoyuki WATANABE , Shin HASE
Abstract: 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：US20170025821A1
公开(公告)日：2017-01-26
申请号：US15301601
申请日：2015-04-01
Applicant: DENSO CORPORATION
Inventor： Kaori DOI , Masamichi SHIBATA , Yuuto TAMEI
IPC: H01T13/20
CPC classification number: H01T13/20 , H01T13/39 , H01T13/467
Abstract: A spark plug 1 has a center electrode 4 and a ground electrode 5 opposed to each other and causes a spark discharge to occur through application of a voltage between the center electrode 4 and the ground electrode 5. Moreover, the center electrode 4 has a columnar main chip 10 provided at a distal end thereof by welding via a fusion portion 12 and an annular auxiliary chip 11 surrounding the fusion portion 12. Consequently, when a spark discharge occurring from the center electrode 4 is blown to the downstream side by the influence of a gas flow in a cylinder of an internal combustion engine, it is possible to suppress a cathode point from being formed in the fusion portion 12 since the fusion portion 12 is surrounded and thus protected by the auxiliary chip 11. As a result, it is possible to suppress wear of the center electrode 4, thereby extending the service life of the spark plug 1.
Abstract translation: 火花塞1具有彼此相对的中心电极4和接地电极5，通过在中心电极4和接地电极5之间施加电压而发生火花放电。此外，中心电极4具有柱状 主芯片10通过熔接部分12的熔接部分和围绕熔化部分12的环形辅助芯片11在其远端处设置。因此，当从中心电极4发生的火花放电被下游侧的吹送 在内燃机的气缸中的气体流动，由于熔融部12被辅助芯片11包围并被保护，所以可以抑制在熔融部12中形成的阴极点。结果是 可以抑制中心电极4的磨损，从而延长火花塞1的使用寿命。
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公开(公告)号：US20150337791A1
公开(公告)日：2015-11-26
申请号：US14718453
申请日：2015-05-21
Applicant: NIPPON SOKEN, INC. , DENSO CORPORATION
Inventor： Takanobu AOCHI , Kaori DOI , Masamichi SHIBATA , Noriaki NISHIO
CPC classification number: F02P15/001 , H01T1/20 , H01T13/02
Abstract: A spark plug has a housing, a pair of center and ground electrodes configured to define a spark gap therebetween, a guide member and an oblique surface. The ground electrode has a standing portion that stands distalward from a distal end of the housing. The guide member is configured to guide the flow of an air-fuel mixture in a combustion chamber of an engine to the spark gap. The guide member protrudes distalward from the distal end of the housing at a different circumferential position from the ground electrode. The oblique surface is formed at the distal end of the housing so as to be circumferentially positioned between the guide member and the standing portion of the ground electrode. The oblique surface is oblique to the axial direction of the spark plug so that the radial distance between the oblique surface and the center electrode decreases in the distalward direction.
Abstract translation: 火花塞具有壳体，一对中心和接地电极，其构造成在其间限定火花隙，引导构件和倾斜表面。 接地电极具有从壳体的远端远离的站立部分。 引导构件被构造成将发动机的燃烧室中的空气燃料混合物的流动引导到火花隙。 引导构件在与接地电极不同的圆周位置处从壳体的远端向远侧突出。 倾斜表面形成在壳体的远端处，以便周向地定位在引导构件和接地电极的竖立部分之间。 斜面相对于火花塞的轴向倾斜，使得倾斜表面与中心电极之间的径向距离在远离方向上减小。
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