Title:
SPARK PLUG
Document Type and Number:
WIPO Patent Application WO/2021/106681
Kind Code:
A1
Abstract:
Provided is a spark plug that can reduce variations in discharge points. The spark plug comprises: a center electrode (15); a main metal fitting (20) that insulates and holds the center electrode; and a ground electrode (50) including a base material (31) having one end (32) connected to the main metal fitting and a chip (51) joined to the other end (33) of the base material, wherein the chip includes a discharge surface (52) facing the center electrode with a spark gap (37) therebetween. The discharge surface has a quadrangular shape, each of the four corners is chamfered, and only a first side (53), which is one of the four sides, is provided with a C surface.
Inventors:
SEKIZAWA TAKASHI (JP)
KASHIMA TOMOKATSU (JP)
ONO YUYA (JP)
TOUMATSU YUKI (JP)
KAWAGUCHI YUDAI (JP)
TORII KAZUYOSHI (JP)
KASHIMA TOMOKATSU (JP)
ONO YUYA (JP)
TOUMATSU YUKI (JP)
KAWAGUCHI YUDAI (JP)
TORII KAZUYOSHI (JP)
Application Number:
PCT/JP2020/042783
Publication Date:
June 03, 2021
Filing Date:
November 17, 2020
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
H01T13/20; H01T13/32
Domestic Patent References:
| WO2012042801A1 | 2012-04-05 |
Foreign References:
| JP2018156728A | 2018-10-04 |
Attorney, Agent or Firm:
PATENT FIRM SHINMEI CENTURY (JP)
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