公开(公告)号：US10256610B2

公开(公告)日：2019-04-09

申请号：US16060784

申请日：2016-08-05

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Keiji Ozeki ,  Tsutomu Kobayashi

IPC: H01T13/20 ,  H01T13/34 ,  H01T13/36

Abstract: A spark plug includes a tubular metal shell that includes a metal-shell step portion extending in an inner circumferential direction, an insulator that is inserted in the metal shell, that includes a facing portion that faces the metal-shell step portion with an annular packing interposed therebetween, a center electrode that extends in the axial direction, that has a flange portion extending in an outer circumferential direction, and a seal body seals the insulator and the center electrode. In a section that contains the axial line and that is along the axial line, a distance L along the axial line from a rear end of the facing portion of the insulator to a rear end of a portion at which the flange portion is in contact with the insulator satisfies L≤1.1 (mm).

公开(公告)号：US10027093B2

公开(公告)日：2018-07-17

申请号：US15561827

申请日：2016-03-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsutomu Kobayashi ,  Keiji Ozeki

IPC: H01T13/20 ,  H01T21/02 ,  H01T13/39 ,  H01T13/34 ,  H01T13/36

Abstract: A spark plug includes an insulator having an axial hole formed in a direction of an axis, a center electrode held in one end side of the axial hole, a metal terminal held in the other end side of the axial hole, an electrical connection part arranged to establish electrical connection between the center electrode and the metal terminal within the axial hole, and a metal shell disposed around an outer circumference of the insulator and having a thread portion formed on at least a part of an outer circumferential surface thereof. The electrical connection part has a resistor, and a conductive seal layer provided between the resistor and the center electrode to seal and fix the insulator and the center electrode together. In a half or more of a region in which the seal layer is provided in the direction of the axis, the spark plug satisfies predetermined conditions.

公开(公告)号：US08791627B2

公开(公告)日：2014-07-29

申请号：US14034610

申请日：2013-09-24

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Keiji Ozeki ,  Naoyuki Mukoyama

IPC: H01T13/36 ,  H01T13/34

CPC classification number: H01T13/36

Abstract: A spark plug includes an insulator, and a metal shell disposed at an outer periphery of the insulator and including a shoulder. The insulator includes a trunk portion, and a leg formed at the tip end side of the trunk portion. The shoulder of the metal shell includes a first shoulder, and a second shoulder formed at the tip end side of the first shoulder. A distance Da between the tip end of the second shoulder and the leg and a distance Db between the tip end of the trunk portion and the second shoulder satisfy a relationship of Da/Db≧1.1. A distance T between the rear end of the first shoulder and the tip end of the second shoulder and a distance L between the rear end of the first shoulder and a tip end face of the metal shell satisfy a relationship of T/L≦0.5.

Abstract translation: 火花塞包括绝缘体和设置在绝缘体的外周并包括肩部的金属壳。 绝缘体包括主干部分和形成在主干部分的顶端侧的腿部。 金属壳的肩部包括形成在第一肩部的顶端侧的第一肩部和第二肩部。 第二肩部的前端与腿部之间的距离Da与躯体部分的前端与第二肩部之间的距离Db满足Da /Db≥1.1的关系。 第一肩部的后端与第二肩部的前端之间的距离T与第一肩部的后端与金属外壳的前端面之间的距离L满足T / L＆lt; llE; 0.5的关系。