公开(公告)号：US20150270687A1

公开(公告)日：2015-09-24

申请号：US14662824

申请日：2015-03-19

Applicant: NGK Spark Plug Co., LTD.

Inventor： Takuya KAWADE ,  Naofumi YAMAMURA

IPC: H01T13/20 ,  H01T15/00

CPC classification number: H01T13/20 ,  H01T13/34 ,  H01T13/39 ,  H01T15/00

Abstract: A spark plug has a center electrode containing a shaft portion, a tip portion joined to a forward end portion of the shaft portion, and a joint portion joining the shaft portion and the tip portion together. In the spark plug, the distance between the surface of the center electrode and an inner edge of the insulator is 0.3 mm or greater. The inner edge is a forward-end-side edge of an inner circumferential surface of a small diameter portion of the insulator, the small diameter portion being a part of a portion of the insulator for accommodating the tip portion and having the smallest inner diameter.

Abstract translation: 火花塞具有包含轴部的中心电极，与轴部的前端部接合的前端部，以及将轴部与前端部接合在一起的接合部。 在火花塞中，中心电极的表面与绝缘体的内缘之间的距离为0.3mm以上。 内边缘是绝缘体的小直径部分的内周面的前端侧边缘，小直径部分是用于容纳前端部分并且具有最小内径的绝缘体的一部分的一部分。

公开(公告)号：US20180019579A1

公开(公告)日：2018-01-18

申请号：US15546875

申请日：2016-01-29

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takuya KAWADE ,  Yuichi YAMADA

IPC: H01T13/39 ,  H01T13/32 ,  H01T21/02 ,  C22C1/04

CPC classification number: H01T13/39 ,  C22C1/0466 ,  H01T13/06 ,  H01T13/32 ,  H01T21/02

Abstract: A spark plug includes an insulator, a metal shell surrounding the insulator, a center electrode disposed in the insulator, with a front end thereof exposed outside from the insulator, a ground electrode having a fixed end portion fixed to the metal shell and a free end portion located at a predetermined gap apart from the center electrode, and a coating part formed of noble metal or noble metal alloy so as to cover at least a region of an inner surface of the ground electrode from a first intersection to a second intersection, where the first intersection is an intersection at which an imaginary line extending from an outer circumference of the center electrode intersects the ground; and the second intersection is an intersection at which an imaginary plane extending through a midpoint of the predetermined gap in parallel with the front end intersects the ground electrode.

公开(公告)号：US20160294163A1

公开(公告)日：2016-10-06

申请号：US15072820

申请日：2016-03-17

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yuichi YAMADA ,  Takuya KAWADE

IPC: H01T13/32 ,  H01T13/39

CPC classification number: H01T13/32 ,  H01T13/16 ,  H01T13/39

Abstract: An ignition plug having a ground electrode that includes a base material layer and an erosion-resistant layer having a thermal conductivity of 40 w/m·K or more. The erosion-resistant layer extends at least from the center-electrode-facing portion to a location closer to the fixed end than a front end of the center electrode and 0.2 mm≦thickness t1 of the erosion-resistant layer≦thickness T of the ground electrode 30−0.6 mm is satisfied.

Abstract translation: 一种火花塞，其具有包括基材层的接地电极和导热率为40w / m·K以上的耐腐蚀层。 抗侵蚀层至少从中心电极相对部分延伸到比中心电极的前端更靠近固定端的位置，并且抗侵蚀层的0.2mm≤厚度t1≤地面的厚度T 满足电极30-0.6mm。