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1. (WO2018164261) INTERNAL COMBUSTION ENGINE SPARK PLUG

Pub. No.:    WO/2018/164261    International Application No.:    PCT/JP2018/009193
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Sat Mar 10 00:59:59 CET 2018
IPC: H01T 13/20
H01T 13/32
Applicants: DENSO CORPORATION
株式会社デンソー
Inventors: NISHIO Noriaki
西尾 典晃
SHIBATA Masamichi
柴田 正道
TERADA Kanechiyo
寺田 金千代
HANASHI Ken
端無 憲
AKIYOSHI Ryohei
秋吉 亮平
AOKI Fumiaki
青木 文明
Title: INTERNAL COMBUSTION ENGINE SPARK PLUG
Abstract:
A central electrode (2) is held in an insulator (12) with a distal end portion protruding from the insulator (12). A ground electrode (3) includes a connection portion (331) connected to the housing (11). The ground electrode (3) forms a spark discharge gap (13) with the central electrode (2). The ground electrode (3) includes a ground base material (31) having the connection portion (331), and a ground protrusion portion (32) which protrudes from the ground base material (31) on the central electrode (2) side, and which forms the spark discharge gap (13) with the central electrode (2). A ground discharge surface (321) of the ground protrusion portion (32) and side surfaces (322), (323), (324) of the ground protrusion portion (32) form right angles or acute angles. At least one of the side surfaces (322), (323), (324) of the ground protrusion portion (32) and at least one of side surfaces of the ground base material (31) are formed flush with each other.