公开(公告)号：US20160053733A1

公开(公告)日：2016-02-25

申请号：US14780801

申请日：2014-01-28

Applicant: DENSO CORPORATION

Inventor： Takanobu AOCHI ,  Takayuki INOHARA ,  Shinichi OKABE ,  Masamichi SHIBATA ,  Noriaki NISHIO

IPC: F02M57/06 ,  H01T13/20

CPC classification number: F02M57/06 ,  F02P13/00 ,  H01T13/02 ,  H01T13/20 ,  H01T13/32

Abstract: A spark plug 1 includes a housing 2, an insulator 3, a center electrode 4 held inside the insulator 3 such that a distal end portion 41 protrudes, a ground electrode 5 including a standing portion 51 and an opposing portion 52, and a guide member 22 that has a guide surface 221 facing the standing portion 51 of the ground electrode 5 and functions to guide a flow of an air-fuel mixture in a combustion chamber of an internal combustion engine to a spark discharge gap G formed between the center electrode 4 and the opposing portion 52 of the ground electrode 5. The opposing portion 52 of the ground electrode 5 has an opposing surface 521 that opposes the center electrode 4, a back surface 522 on the opposite axial side to the opposing surface 521, and a pair of side surfaces 523 and 524 that connect the opposing surface 521 and the back surface 522. Of the pair of side surfaces 523 and 524, at least the side surface 523 on the guide member 22 side is formed so as to make an obtuse angle with the opposing surface 521.

Abstract translation: 火花塞1包括壳体2，绝缘体3，保持在绝缘体3内部的中心电极4，使得前端部41突出，包括立起部51和相对部52的接地电极5和引导构件 22，其具有面对接地电极5的竖立部分51的引导表面221，并且用于将内燃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4之间的火花放电间隙G 和接地电极5的相对部分52.接地电极5的相对部分52具有与中心电极4相对的相对表面521，与相对表面521相对的轴向侧上的后表面522和一对 连接相对表面521和后表面522的侧表面523和524。在一对侧表面523和524中，至少引导构件22侧的侧表面523形成为形成钝角 与相对表面521。

公开(公告)号：US20150108892A1

公开(公告)日：2015-04-23

申请号：US14519726

申请日：2014-10-21

Applicant: DENSO CORPORATION

Inventor： Masamichi SHIBATA

IPC: H01T13/39

CPC classification number: H01T13/20 ,  H01T13/16

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。

公开(公告)号：US20140159563A1

公开(公告)日：2014-06-12

申请号：US14101386

申请日：2013-12-10

Applicant: Denso Corporation

Inventor： Masamichi SHIBATA ,  Takayuki INOHARA ,  Shinichi Okabe ,  Takanobu AOCHI ,  Kaori DOI

IPC: H01T13/02

CPC classification number: H01T13/02 ,  H01T13/32

Abstract: A spark plug for internal combustion engines is provided, where the spark plug includes a cylindrical housing, a cylindrical insulation porcelain part, a center electrode, and a ground electrode. The insulation porcelain is housed in the housing and the center electrode is held inside the insulation porcelain. The ground electrode protrudes from a top end portion of the housing. A spark discharge gap is left between the ground and center electrodes. Further, first to third projections are formed on the top end portion. The first projection is opposed to the ground electrode with the center electrode therebetween. The second projection is closer to the ground electrode than to the first projection. The third projection is closer to the first projection than to the ground electrode.

Abstract translation: 提供了一种用于内燃机的火花塞，其中火花塞包括圆柱形壳体，圆柱形绝缘瓷部件，中心电极和接地电极。 绝缘瓷被容纳在壳体中，中心电极保持在绝缘瓷内。 接地电极从壳体的顶端部突出。 火花放电间隙留在接地和中心电极之间。 此外，在顶端部形成有第一至第三突起。 第一突起与其间具有中心电极的接地电极相对。 第二突起比第一突起更靠近接地电极。 第三投影比接地电极更靠近第一投影。

公开(公告)号：US20130192570A1

公开(公告)日：2013-08-01

申请号：US13648483

申请日：2012-10-10

Applicant: DENSO CORPORATION

Inventor： Yuji KAJITA ,  Masamichi SHIBATA ,  Yasuomi IMANAKA ,  Atsuya MIZUTANI ,  Tsutomu OOSUKA

IPC: F02P13/00

CPC classification number: F02P13/00 ,  F02P3/04 ,  F02P3/051 ,  F02P3/053 ,  F02P3/0838 ,  F02P3/0884 ,  F02P9/00 ,  F02P15/00

Abstract: An ignition apparatus is provided with a Zener diode as a limiter device, which limits a primary voltage of an ignition coil to be less than a Zener voltage, and a switching circuit, which prohibits a limiter function of the Zener diode at a start of discharge and switches the limiter device to perform the limiter function for a predetermined time period following the start of discharge. A secondary voltage is limited to be more than a secondary limit value. Even when blowout arises in discharging, re-discharging is avoided from arising immediately after the blowout and exhaustion of a spark plug caused by repetition of discharging is avoided.

Abstract translation: 点火装置设有齐纳二极管作为限制装置，其将点火线圈的初级电压限制为小于齐纳电压;以及开关电路，其在开始放电时禁止齐纳二极管的限幅器功能 并且在放电开始之后的预定时间段内切换限制器件以执行限制器功能。 次级电压被限制为大于次级限制值。 即使在排出时产生喷出，也避免了在由于重复放电引起的火花塞的喷出和排出之后立即产生再排放。

公开(公告)号：US20210159675A1

公开(公告)日：2021-05-27

申请号：US16953488

申请日：2020-11-20

Applicant: DENSO CORPORATION

Inventor： Masamichi SHIBATA

IPC: H01T13/36 ,  H01T13/32

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.

公开(公告)号：US20190214795A1

公开(公告)日：2019-07-11

申请号：US16088971

申请日：2017-03-24

Applicant: DENSO CORPORATION

Inventor： Masayuki TAMURA ,  Nobuo ABE ,  Masamichi SHIBATA

IPC: H01T13/39 ,  H01T13/08 ,  H01T13/32 ,  H01T21/02

CPC classification number: H01T13/39 ,  H01T13/08 ,  H01T13/20 ,  H01T13/32 ,  H01T21/02

Abstract: An ignition plug for an internal combustion engine includes an electrode protrusion that protrudes from an electrode base material of a ground electrode toward a discharge gap. The electrode protrusion has a base part that is integrated with the electrode base material and a cover part that is joined to the base part and faces the discharge gap. The base part has an end surface facing a protrusion direction of the base part and a side peripheral surface. An outer edge of the end surface has a curved surface. The cover part is formed from a precious metal or a precious metal alloy having a lower linear expansion coefficient than that of a material for forming the base part and covers at least a part of the side peripheral surface and the end surface of the base part. While the ignition plug is attached to an internal combustion engine and the electrode protrusion is heated and then cooled, a projection is formed on an outer surface of a portion covering the side peripheral surface of the base part.

公开(公告)号：US20160064903A1

公开(公告)日：2016-03-03

申请号：US14842073

申请日：2015-09-01

Applicant: DENSO CORPORATION

Inventor： Masataka DEGUCHI ,  Hironori OSAMURA ,  Kanechiyo TERADA ,  Junichi WADA ,  Masamichi SHIBATA ,  Yuuki TSUKAMOTO

IPC: H01T13/32 ,  H01T13/34 ,  H01T21/02

CPC classification number: H01T13/32 ,  H01T13/34 ,  H01T13/467 ,  H01T21/02

Abstract: A spark plug includes a tubular housing, a tubular insulator retained in the housing, a center electrode secured in the insulator with a distal end portion of the center electrode protruding outside the insulator, and an annular ground electrode fixed to a distal end of the housing. The housing has, at the distal end thereof, a small-inner diameter portion that has a smaller inner diameter than other portions of the housing. The annular ground electrode is arranged on a distal end surface of the small-inner diameter portion of the housing so that an inner circumferential surface of the ground electrode faces an outer circumferential surface of the distal end portion of the center electrode through a spark gap formed therebetween. The outer diameter of the ground electrode is less than the outer diameter of the distal end surface of the small-inner diameter portion of the housing.

Abstract translation: 火花塞包括管状壳体，保持在壳体中的管状绝缘体，固定在绝缘体中的中心电极，其中心电极的远端部突出于绝缘体外部，以及环形接地电极，固定到壳体的远端 。 壳体在其远端处具有比壳体的其它部分更小的内径的小内径部分。 环形接地电极设置在壳体的小内径部分的远端表面上，使得接地电极的内周面通过形成的火花间隙面对中心电极的远端部分的外圆周表面 之间。 接地电极的外径小于壳体的小内径部分的远端表面的外径。

公开(公告)号：US20160006219A1

公开(公告)日：2016-01-07

申请号：US14790013

申请日：2015-07-02

Applicant: DENSO CORPORATION

Inventor： Masamichi SHIBATA

IPC: H01T13/20

CPC classification number: H01T13/20 ,  H01T13/34

Abstract: A spark plug includes a tubular housing, a tubular insulator retained in the housing, a center electrode secured in the insulator, and a ground electrode provided at a distal end of the housing. The housing has a seat portion formed on its inner periphery. The insulator has a distal portion, a proximal portion, and a shoulder formed on an outer periphery of the insulator between the distal and proximal portions. The shoulder is arranged to seat on the seat portion of the housing with an annular packing interposed therebetween. On an inner peripheral surface of the seat portion of the housing which faces an outer peripheral surface of the distal portion of the shoulder, there are formed uneven portions that are arranged in a circumferential direction of the spark plug. Each of the uneven portions consists of a protrusion and a recess that adjoin each other in the circumferential direction.

Abstract translation: 火花塞包括管状壳体，保持在壳体中的管状绝缘体，固定在绝缘体中的中心电极和设置在壳体的远端处的接地电极。 壳体具有形成在其内周上的座部。 绝缘体具有远端部分，近端部分和形成在远端部分和近端部分之间的绝缘体的外周上的肩部。 肩部布置成在壳体的座部上安置有插入其间的环形填料。 在壳体的座部的与肩部的远端部的外周面相对的内周面上形成有沿火花塞的圆周方向配置的凹凸部。 每个不平坦部分由在周向彼此相邻的突起和凹部组成。

公开(公告)号：US20150337792A1

公开(公告)日：2015-11-26

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

IPC: F02P15/00 ,  H01T13/02

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。

公开(公告)号：US20130200816A1

公开(公告)日：2013-08-08

申请号：US13758428

申请日：2013-02-04

Applicant: DENSO CORPORATION

Inventor： Masamichi SHIBATA ,  Yuji KAJITA ,  Atsuya MIZUTANI ,  Koichi HATTORI ,  Yasuomi IMANAKA

IPC: H01T13/44

CPC classification number: H01T13/44 ,  F02P3/0407 ,  F02P3/0552 ,  F02P9/002

Abstract: An ignition system is provided, which can restrict decreasing of constant-voltage duration of a spark plug and effectively prevents the occurrence of an accidental fire in an engine. A typical ignition system includes a secondary coil having one end connected to a positive side of a battery via a low-voltage side path and the other end connected to a center electrode via a connecting path which connects the secondary coil and the spark plug. A constant-voltage path having a grounded end is connected to the connecting path. A block diode is arranged between the secondary coil and a point where the constant-voltage path is connected with the connecting path. A Zener diode is disposed within the constant-voltage path. Each anode of the block diode and the Zener diode is mutually connected.

Abstract translation: 提供一种点火系统，其可以限制火花塞的恒定电压持续时间的降低，并有效地防止发动机中发生意外的火灾。 典型的点火系统包括一个次级线圈，其一端通过低压侧路径连接到电池的正极侧，另一端经由连接次级线圈和火花塞的连接路径连接到中心电极。 具有接地端的恒定电压路径连接到连接路径。 在次级线圈和恒定电压路径与连接路径连接的点之间布置有块二极管。 齐纳二极管设置在恒压通路内。 块二极管和齐纳二极管的每个阳极相互连接。