Title:
内燃機関用の点火プラグ
Document Type and Number:
Japanese Patent JP7151350
Kind Code:
B2
Abstract:
A spark plug includes a center electrode held inside an insulator, a ground electrode that is provided on a housing holding the insulator and faces the center electrode, and a composite chip formed on at least one of the electrodes. In the composite chip, a core having a mount integral with an electrode base material is formed from a Ni alloy material, and a surface layer having a discharge portion covering a protrusion end surface of the core and a side surface coating covering a side surface is formed from a Pt alloy material. The coating thickness S of the side surface coating in the radial direction, the outer diameter D1 of the discharge portion, and the coating length L1 of the side surface coating in the axial direction satisfy: S≥D1/20+L1/10−0.005 mm.
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Inventors:
Nobuo Abe
Application Number:
JP2018189149A
Publication Date:
October 12, 2022
Filing Date:
October 04, 2018
Export Citation:
Assignee:
株式会社デンソー
International Classes:
H01T13/20; C22C5/04; C22C19/05; H01T13/32
Domestic Patent References:
| JP2017183102A | ||||
| JP5545166B2 | ||||
| JP6017027B2 | ||||
| JP492383A |
Attorney, Agent or Firm:
Patent Business Corporation Aichi International Patent Office
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