公开(公告)号：US09935430B2

公开(公告)日：2018-04-03

申请号：US14650075

申请日：2013-12-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Go Matsumura ,  Kazuyoshi Torii ,  Yasuhide Shimanokami

IPC: H01T13/39 ,  H01T13/20 ,  H01T13/36

CPC classification number: H01T13/39 ,  H01T13/20 ,  H01T13/36

Abstract: A spark plug having a of center electrode, a ground electrode, and a noble metal tip that is laser-welded to at least one of the center electrode and the ground electrode The noble metal tip is joined to the electrode through a fused portion formed by laser welding, and the fused portion includes a first fused portion and a second fused portion.

公开(公告)号：US12009639B2

公开(公告)日：2024-06-11

申请号：US17437679

申请日：2020-11-17

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

CPC classification number: 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.