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Patent Searching and Data


Title:
SPARK PLUG
Document Type and Number:
Japanese Patent JP2018113145
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a spark plug suppressing preignition of air-fuel mixture due to heat.SOLUTION: A spark plug 1 includes a ground electrode provided at one end of a cylindrical housing, a cylindrical insulator 35 placed on the inside of the housing, and a center electrode 801 located on the inside of the insulator 35 and forming a gap between the ground electrode and having a discharge part capable of forming a spark that can ignite fuel in the gap. The center electrode 801 has a shaft 42 consisting of a columnar body 421 and multiple protrusions 422 on the opposite side to the ground electrode of the discharge part. The multiple protrusions 422 are provided on the radial outside wall surface 423 of the body 421 and formed to protrude radially outward of the body 421. In the profile perpendicular to the medial axis C1 of the shaft 42, the equivalent diameter obtained by dividing four times of the cross-sectional area by the length of the outer periphery of the profile is small compared with the equivalent circle diameter corresponding to the diameter of a perfect circle having the same area as that of the profile.SELECTED DRAWING: Figure 5

Inventors:
SHIBATA SATOYUKI
SHIBATA MASAMICHI
HASHINASHI KEN
KURIMOTO NAOKI
OSAKA JUN
Application Number:
JP2017002392A
Publication Date:
July 19, 2018
Filing Date:
January 11, 2017
Export Citation:
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Assignee:
DENSO CORP
International Classes:
H01T13/20; H01T13/16; H01T13/34; H01T13/36
Attorney, Agent or Firm:
Masaki Hattori