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Patent Searching and Data


Title:
SPARK PLUG
Document Type and Number:
WIPO Patent Application WO/2021/010102
Kind Code:
A1
Abstract:
Provided is a spark plug having an insulator which can be made less likely to be breached. The insulator is provided with a cylindrical first section, a cylindrical second section positioned on a rear end side of the first section and having an outer diameter F at the leading end thereof smaller than the outer diameter of the first section, a cylindrical third section positioned on a leading end side of the first section and having an outer diameter D at the rear end thereof smaller than the outer diameter of the first section and the outer diameter F of the leading end of the second section, a first inclined section connecting the first section and the second section and having an outer diameter decreasing toward the rear end side thereof, and a second inclined section connecting the first section and the third section and having an outer diameter decreasing toward the leading end side thereof. The axial length A of the second inclined section and axial length B of the first inclined section satisfy 2.0 ≤ A/B ≤ 3.9, and 0.50 ≤ D/F ≤ 0.88 is satisfied.

Inventors:
SHIMADA HIROKI (JP)
YOSHIDA HARUKI (JP)
HARATA NAOYA (JP)
Application Number:
PCT/JP2020/024544
Publication Date:
January 21, 2021
Filing Date:
June 23, 2020
Export Citation:
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Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
H01T13/20
Foreign References:
JP2001155839A2001-06-08
JP2001155546A2001-06-08
JP2018085323A2018-05-31
Attorney, Agent or Firm:
PATENT FIRM SHINMEI CENTURY (JP)
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