SPARK PLUG AND MANUFACTURING METHOD THEREOF

Title:

SPARK PLUG AND MANUFACTURING METHOD THEREOF

Document Type and Number:

WIPO Patent Application WO/2018/070129

Kind Code:

A1

Abstract:

This spark plug (100) is provided with: a cylindrical attachment fitting (10) which can be mounted on an internal combustion engine; a center electrode (30) which is insulated from and held by the attachment fitting, and one end (31) of which extends, exposed, from one end (11) of the attachment fitting; a ground electrode (40) which is bonded at one end to one end of the attachment fitting and which extends such that one surface (45) on the other end is opposite of the aforementioned one end of the center electrode; a protrusion (46, 46A, 46B) which, on the aforementioned one surface of the ground electrode, protrudes from the base material of the ground electrode towards the center electrode, has an outwardly convex surface, and is formed as a surface without corners; and a noble metal layer (60) which is formed on the surface of the protrusion.

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Inventors:

HATTORI KENJI (JP)
OHNO RYUICHI (JP)

Application Number:

PCT/JP2017/031407

Publication Date:

April 19, 2018

Filing Date:

August 31, 2017

Export Citation:

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Assignee:

DENSO CORP (JP)

International Classes:

H01T13/32; H01T13/20; H01T21/02

Domestic Patent References:

WO2010053116A1

2010-05-14

Foreign References:

US5998912A	1999-12-07
US5373214A	1994-12-13
JP2010170705A	2010-08-05

Attorney, Agent or Firm:

KAMATA, Toru et al. (JP)

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