Title:
SPARK PLUG FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2021/251211
Kind Code:
A1
Abstract:
This spark plug (1) comprises: a cylindrical isolation insulator (3); a center electrode (4) that is retained on an inner circumferential side of the isolation insulator (3) and has formed thereon an apical-end projection (41) which projects from the isolation insulator (3) toward an apical end side; a cylindrical housing (2) that retains the isolation insulator (3) on an inner circumferential side thereof; and a plug cover (5) that is disposed at an apical end of the housing (2) in such a manner as to cover an auxiliary combustion chamber (50) in which the apical-end projection (41) is disposed. The plug cover (5) has provided thereto an injection hole (51) that connects the auxiliary combustion chamber (50) to the outside. The housing (2) and the plug cover (5) each have provided thereto a positioning part (7) that serves to determine the respective positions of the housing (2) and the plug cover (5) in the plug circumferential direction.
Inventors:
SUGITA KEISUKE (JP)
KINOSHITA SHOTA (JP)
SUGIURA AKIMITSU (JP)
SHIMAMOTO DAISUKE (JP)
KINOSHITA SHOTA (JP)
SUGIURA AKIMITSU (JP)
SHIMAMOTO DAISUKE (JP)
Application Number:
PCT/JP2021/020826
Publication Date:
December 16, 2021
Filing Date:
June 01, 2021
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
F02B23/08; F02B19/12; H01T13/08; H01T13/20; H01T13/32; H01T13/54
Foreign References:
| JP2016072104A | 2016-05-09 | |||
| JP2012038524A | 2012-02-23 | |||
| JP2020053225A | 2020-04-02 |
Attorney, Agent or Firm:
AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (JP)
Download PDF: