Title:
スパークプラグ
Document Type and Number:
Japanese Patent JP7220167
Kind Code:
B2
Abstract:
This spark plug includes a cap portion covering a center electrode and an end of a ground electrode from a front side. In a cross section including an axial line, where a pitch of an external thread of a metal shell is X (mm), an axial-line-direction distance between a crest of a rear-end ridge of a full thread portion of an external thread and a rear end of a contact portion of an insulator with which the metal shell contacts directly or via another member is A (mm), an axial-line-direction distance between the rear end of the contact portion and a front end of the insulator is B (mm), and an axial-line-direction distance between the rear end of the contact portion and a seating surface of the metal shell is C (mm), 0
Inventors:
Tatsuya Gozawa
Ritsuka Nakagawa
Ritsuka Nakagawa
Application Number:
JP2020021047A
Publication Date:
February 09, 2023
Filing Date:
February 11, 2020
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
H01T13/54; F02B19/08; F02B19/12; H01T13/20
Domestic Patent References:
JP2013503447A | ||||
JP201946661A | ||||
JP2019139901A | ||||
JP4068381B2 | ||||
JP2009503782A |
Attorney, Agent or Firm:
Patent Attorney Corporation Shinmei Century