公开(公告)号：US10666023B2

公开(公告)日：2020-05-26

申请号：US16455939

申请日：2019-06-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya Gozawa

IPC: H01T13/00 ,  H01T13/32 ,  H01T13/54

Abstract: A spark plug includes: a center electrode; an insulating member; a metal shell; a ground electrode; and a cap covers an opening of the metal shell on the front end side to define an auxiliary combustion space in which the gap is disposed, a first angle being formed by a second line and a first tangent line, a second angle being formed by the second line and a second tangent line, the second angle being greater than the first angle, and at least a portion of the opening of the specific through hole on the auxiliary combustion space side being positioned on a range of the second angle.