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Patent Searching and Data


Title:
SPARK PLUG
Document Type and Number:
WIPO Patent Application WO/2013/157173
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a spark plug that can improve the combustion efficiency of an internal combustion engine. The cross-sectional shape of the middle section (460) of a ground electrode (40) in the spark plug (100) satisfies the relationships of B > (A/2), R1 > r1, and R2 > r2, wherein A represents the length between base point P3 and base point P4 along the X-axis direction, B represents the length along the Y-axis direction from the straight line that connects base point P3 and base point P4 to base point P7, r1 represents the average curvature radius of the first curved section, r2 represents the average curvature radius of the second curved section, R1 represents the average curvature radius of the third curved section, and R2 represents the average curvature radius of the fourth curved section.

Inventors:
SUZUKI, Kaori (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
Application Number:
JP2013/000310
Publication Date:
October 24, 2013
Filing Date:
January 23, 2013
Export Citation:
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Assignee:
NGK SPARK PLUG CO., LTD. (14-18, Takatsuji-cho Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
International Classes:
H01T13/32; F02P13/00
Domestic Patent References:
WO2009153927A1
WO2010038611A1
Foreign References:
JP2006049206A
Attorney, Agent or Firm:
AOKI, Noboru et al. (C/O NGK SPARK PLUG CO. LTD, 2808 Oaza-Iwasaki, Komaki-sh, Aichi 10, 〒4858510, JP)
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