公开(公告)号：US20220166196A1

公开(公告)日：2022-05-26

申请号：US17437679

申请日：2019-11-17

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takashi SEKIZAWA ,  Tomokatsu KASHIMA ,  Yuya ONO ,  Yuki TOUMATSU ,  Yudai KAWAGUCHI ,  Kazuyoshi TORII

IPC: H01T13/32 ,  H01T13/06 ,  H01T21/02

Abstract: A spark plug that can reduce variation in a discharge point. The spark plug includes: a center electrode; a metal shell insulating and holding the center electrode; and a ground electrode including a base material having one end portion connected to the metal shell, and a tip connected to another end portion of the base material. The tip has a discharge surface opposed to the center electrode with a spark gap therebetween. The discharge surface has a quadrangular shape and is chamfered at four sides thereof. Only a first side which is one of the four sides is provided with a C chamfer.