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Patent Searching and Data


Title:
SPARK PLUG
Document Type and Number:
WIPO Patent Application WO/2015/093003
Kind Code:
A1
Abstract:
The durability of a grounding electrode is improved. The spark plug has a central electrode extending in an axial direction, and a grounding electrode forming a gap with the front end surface of the central electrode. The grounding electrode has an outer layer forming a portion of the grounding electrode surface, and a core part that is partially covered by the outer layer, is formed from a material having a higher heat conductivity than the outer layer, and is provided with an exposed surface, which is a portion exposed from under the outer layer. The outer layer is formed from a material containing nickel as the main component, and 14% by weight or more of chromium. The core part is formed from a material containing nickel at a higher content ratio than the nickel content ratio of the outer layer. When the front end surface of the central electrode is projected parallelly to the axial direction, the exposed surface contains the portion within the grounding electrode that overlaps with the projected front end surface.

Inventors:
ITO, Kazuki (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
Application Number:
JP2014/006115
Publication Date:
June 25, 2015
Filing Date:
December 08, 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; H01T13/32; H01T13/39
Foreign References:
JPH03208281A1991-09-11
JP2007265842A2007-10-11
JPH11111426A1999-04-23
JP2007165291A2007-06-28
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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