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Title:
SPARK PLUG
Document Type and Number:
WIPO Patent Application WO/2015/093481
Kind Code:
A1
Abstract:
In the present invention, a spark plug has a center electrode and a ground electrode set apart across a gap with respect to the center electrode. The center electrode and/or the ground electrode has a shaft section and an electrode chip joined onto one surface of the shaft section. The shaft section has a first core section formed from a material containing copper and a second outer layer formed from a material having a higher corrosion resistance than the first core section, the first outer layer covering at least some of the first core section. The electrode chip has: a second outer layer formed from a material containing a precious metal, the second outer layer forming the outermost surface of the electrode chip; and a second core section formed from a material having a higher thermal conductivity than the second outer layer, the second core section being at least partially covered by the second outer layer.

Inventors:
SEGAWA, Masayuki (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
SUMOYAMA, Daisuke (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
Application Number:
JP2014/083267
Publication Date:
June 25, 2015
Filing Date:
December 16, 2014
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:
H01T13/20; H01T13/39
Foreign References:
JP2012089353A2012-05-10
JP2013037806A2013-02-21
JPH10106716A1998-04-24
JPH0554953A1993-03-05
JP2008027870A2008-02-07
JPH0536462A1993-02-12
Other References:
See also references of EP 3086422A4
Attorney, Agent or Firm:
TOKKYO GYOMUHOJIN OHTORI INTERNATIONAL PATENT FIRM (Marunouchi Annex Bldg. 8th floor, 18-10 Marunouchi 2-chome, Naka-ku, Nagoya-sh, Aichi 02, 〒4600002, JP)
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