公开(公告)号：US20220060000A1

公开(公告)日：2022-02-24

申请号：US17405189

申请日：2021-08-18

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Junji KIMURA

IPC: H01T13/58 ,  H01T21/02 ,  H01T13/02

Abstract: A spark plug including an insulator and a metallic member such as a metallic shell. In the spark plug, a mark such as a two-dimensional code is provided on the surface of at least one of the insulator and the metallic member, Also, a protective layer covers the mark. The protective layer is optically transparent and contains a fluorescent substance.

公开(公告)号：US20200021084A1

公开(公告)日：2020-01-16

申请号：US16504541

申请日：2019-07-08

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Junji KIMURA

IPC: H01T13/39

Abstract: A spark plug includes a tip extending in a first direction and an electrode base metal having an extending portion extending in the first direction and connected to the tip through a fusion zone. In a section taken along the first direction and containing a center axis of the tip, in a case where two ends of the interface between the extending portion and the fusion zone are located at the same position with respect to the first direction, the linear distance between the ends is denoted by A, or, in a case where one end is located forward of the other end, the distance from the one end to an intersection between a straight line passing the one end and extending perpendicularly to the center axis and the outline of the fusion zone is denoted by A. The interface length B satisfies a relational expression B/A≥1.2.

公开(公告)号：US20170025823A1

公开(公告)日：2017-01-26

申请号：US15214505

申请日：2016-07-20

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Junji KIMURA ,  Keiji OZEKI

IPC: H01T13/60 ,  H01T13/34 ,  H01T21/02

CPC classification number: H01T13/60 ,  H01T13/34 ,  H01T13/58 ,  H01T21/02

Abstract: A method for manufacturing a spark plug comprising the steps of: placing an assembly of the center electrode, an insulator, and a metal shell in a pressure resistant vessel and determining whether or not the insulator has a defect by applying a voltage to the center electrode, and bending the ground electrode toward the center electrode after the defect inspection step, the defect inspection step being performed while a pressure in the pressure resistant vessel is changed to a plurality of different pressures.

Abstract translation: 一种用于制造火花塞的方法，包括以下步骤：将中心电极，绝缘体和金属壳的组件放置在耐压容器中，并通过向中心电极施加电压来确定绝缘体是否具有缺陷 并且在缺陷检查步骤之后将接地电极向中心电极弯曲，在耐压容器内的压力变为多个不同压力的同时进行缺陷检查步骤。