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公开(公告)号：US09377001B2
公开(公告)日：2016-06-28
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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公开(公告)号：US09234491B2
公开(公告)日：2016-01-12
申请号：US14718783
申请日：2015-05-21
Applicant: NIPPON SOKEN, INC. , DENSO CORPORATION
Inventor： Takanobu Aochi , Masamichi Shibata , Noriaki Nishio , Kaori Doi
CPC classification number: F02P15/001 , H01T13/02 , H01T13/20
Abstract: A spark plug for an internal combustion engine includes a tubular housing, a tubular insulator, a center electrode, a ground electrode and a guide member. The guide member is configured to guide the flow of an air-fuel mixture in a combustion chamber of the engine to a spark gap formed between the center electrode and the ground electrode. Moreover, in the spark plug, the following dimensional relationships are satisfied: b≧−67.8×(a/D)+27.4; b≦−123.7×(a/D)+64.5; −0.4≦(a/D)≦0.4; and 0°≦b≦90°. Further, with an oblique angle θ being in the range of 0 to 30°, the following dimensional relationship is also satisfied: 0.8≦r/R≦1. Consequently, the spark plug can secure, with a simple configuration, a stable ignition capability regardless of the mounting posture of the spark plug to the engine.
Abstract translation: 用于内燃机的火花塞包括管状壳体，管状绝缘体，中心电极，接地电极和引导构件。 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形成在中心电极和接地电极之间的火花间隙。 此外，在火花塞中，满足以下尺寸关系：b≥-67.8×（a / D）+27.4; b＆nlE; -123.7×（a / D）+64.5; -0.4＆nlE;（a / D）＆nlE; 0.4; 0°＆nlE; b＆nlE; 90°。 此外，倾斜角度和角度; 在0至30°的范围内，还满足以下尺寸关系：0.8＆nlE; r / R＆nlE; 1。 因此，无论火花塞的安装姿势如何，发动机都可以以简单的结构确保火花塞的稳定点火能力。
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公开(公告)号：US11056858B2
公开(公告)日：2021-07-06
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：US10886709B1
公开(公告)日：2021-01-05
申请号：US16905174
申请日：2020-06-18
Applicant: DENSO CORPORATION
Inventor： Yuya Abe , Masamichi Shibata
IPC: H01T13/32
Abstract: On a base part forming a ground electrode in a spark plug, a facing surface is formed facing a distal end surface of a central electrode to have a shortest gap between the facing surface and the central electrode. A first slope surface is formed on an upper surface of the base part. A downstream-side end surface is formed parallel with a virtual plane, and connected to the first slope surface. A second slope surface is formed on a lower surface of the base part, connected to a downstream-side end surface. An opposing surface is formed on the lower surface of the base part. A width of the facing surface is wider than a width of the opposing surface. A first angle of the facing surface to the first slope surface satisfies a relationship of 10°≤θ1≤40°.
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公开(公告)号：US10777974B2
公开(公告)日：2020-09-15
申请号：US16551912
申请日：2019-08-27
Applicant: DENSO CORPORATION
Inventor： Noriaki Nishio , Masamichi Shibata , Kanechiyo Terada , Ken Hanashi , Ryohei Akiyoshi , Fumiaki Aoki
IPC: H01T13/32
Abstract: 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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Patent Agency Ranking
公开(公告)号：US10305258B2
公开(公告)日：2019-05-28
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：US09948067B2
公开(公告)日：2018-04-17
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≤1.07W+0.66. This ensures the stability of ignitability of the spark plug.
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公开(公告)号：US09488151B2
公开(公告)日：2016-11-08
申请号：US13722453
申请日：2012-12-20
Applicant: DENSO CORPORATION
Inventor： Masamichi Shibata , Atsuya Mizutani , Koichi Hattori , Yasuomi Imanaka
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：US09059572B2
公开(公告)日：2015-06-16
申请号：US14519726
申请日：2014-10-21
Applicant: DENSO CORPORATION
Inventor： Masamichi Shibata
Abstract: A spark plug includes a center electrode, an insulator holding the center electrode inserted thereinto, a housing holding the insulator inserted thereinto and a ground electrode joined to the housing so as to form a spark discharge gap with the center electrode. The center electrode includes a core member and a cover layer covering a surface of the core member. The core member includes a large-diameter portion made of a material having a thermal conductivity higher than that of the cover layer, a small-diameter portion extending from the large-diameter portion toward a distal end side of the core member, and a connecting portion connecting the large-diameter portion to the small-diameter portion. The cover layer is made of a material having a linear expansion coefficient lower than that of the core member, and covers between at least part of the connecting portion and a distal end of the small-diameter portion.
Abstract translation: 火花塞包括中心电极，保持插入其中心电极的绝缘体，容纳插入其中的绝缘体的壳体和与壳体接合的接地电极，以与中心电极形成火花放电间隙。 中心电极包括芯部件和覆盖芯部件表面的覆盖层。 芯构件包括由导热率高于覆盖层的导热率的材料制成的大直径部分，从芯部件的大直径部分朝向远端侧延伸的小直径部分，以及连接 将大直径部分连接到小直径部分的部分。 覆盖层由具有低于芯构件的线膨胀系数的线膨胀系数的材料制成，并且覆盖在连接部分的至少一部分和小直径部分的远端之间。
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公开(公告)号：US11005238B1
公开(公告)日：2021-05-11
申请号：US16953488
申请日：2020-11-20
Applicant: DENSO CORPORATION
Inventor： Masamichi Shibata
Abstract: A spark plug has a housing, an insulator, a central electrode and a ground electrode. A projection part is formed projecting radially from the housing. The spark plug has a structure which satisfies a relationship of t2/t1≤0.85, s1≤0.5, and s1≥1.05−t2/t1. A leg part of the insulator has a first end and a second end in an axial direction thereof. The second end is located opposite to the first end in the axial direction. In the relationship, t1 represents a first radial thickness of the first end in a radial direction of the leg part, t2 represents a center radial thickness in the radial direction at a middle position of the leg part, and s1 represents a first gap width in the radial direction of the housing between the projection part of the housing and the first end of the leg part.
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