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Title:
SPARK PLUG FOR INTERNAL COMBUSTION ENGINES
Document Type and Number:
WIPO Patent Application WO/2019/131565
Kind Code:
A1
Abstract:
A spark plug (1) has a housing (2), an insulator (3), a center electrode (4), and a ground electrode (5). The ground electrode (5) has a gap forming surface (521) which forms a discharge gap (G) between the gap forming surface (521) and the front end surface (421) of the center electrode (4). The insulator (3) has an insulator protrusion (31) protruding to the front end side, in a plug axis direction (Z), of the housing (2). At least one cross-section of cross-sections which pass through a plug center axis and which are parallel to the plug axis direction (Z) is designated as a parallel-to-axis cross-section. The outer peripheral surface of the insulator protrusion (31) has, in the parallel-to-axis cross-section, an insulator sloped surface (311) having a straight line shape or a curved line shape which protrudes to the inner peripheral side, the insulator sloped surface (311) extending toward the inner peripheral side as the insulator sloped surface (311) extends toward the front end side in the plug axis direction (Z). In the parallel-to-axis cross-section, an imaginary straight line (L1) passing through the opposite ends of the insulator sloped surface (311) passes through the gap forming surface (521).

Inventors:
TANAKA Daisuke (INC. 500-20, Minamiyama, Komenoki-cho, Nisshin-cit, Aichi 11, 〒4700111, JP)
AOKI Fumiaki (INC. 500-20, Minamiyama, Komenoki-cho, Nisshin-cit, Aichi 11, 〒4700111, JP)
HAYASHI Naoto (1-1 Showa-cho, Kariya-cit, Aichi 61, 〒4488661, JP)
SHIMAMOTO Daisuke (1-1 Showa-cho, Kariya-cit, Aichi 61, 〒4488661, JP)
Application Number:
JP2018/047406
Publication Date:
July 04, 2019
Filing Date:
December 24, 2018
Export Citation:
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Assignee:
DENSO CORPORATION (1-1 Showa-cho, Kariya-city Aichi, 61, 〒4488661, JP)
International Classes:
H01T13/20; H01T13/32
Domestic Patent References:
WO2016013615A12016-01-28
Foreign References:
JPH09129356A1997-05-16
JP2008108479A2008-05-08
JP2013513928A2013-04-22
Attorney, Agent or Firm:
AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (Meieki Nagata Building, 26-19 Meieki 3-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 〒4500002, JP)
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