SPARK PLUG - NGK SPARK PLUG CO

Title:

SPARK PLUG

Document Type and Number:

WIPO Patent Application WO/2014/199540

Kind Code:

A1

Abstract:

To effectively reduce the stress difference generated between a tip and an annular part, preventing peeling or cracking of the tip in a more reliable manner. A spark plug (1) is provided with: an insulator (2) having a shaft hole (4); a center electrode (5) inserted into the shaft hole (4); a main bracket (3) provided to the outer periphery of the insulator (2); a ground electrode (27) having, at the distal end part, an annular part (27A) in which a center electrode (5) is disposed in the inner circumference, the base end part of the ground electrode (27) being fixed to the main bracket (3); and an annular tip (32) joined to the inner periphery of the annular part (27A), the annular tip (32) forming a spark discharge gap (28) between the inner circumferential surface of the annular tip (32) and the center electrode (5). A recess (35) is provided to the inner periphery and/or the outer circumference of the annular part (27A).

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Inventors:

MATSUNAGA YUICHI (JP)
SAKAKURA YASUSHI (JP)

Application Number:

PCT/JP2014/001246

Publication Date:

December 18, 2014

Filing Date:

March 06, 2014

Export Citation:

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Assignee:

NGK SPARK PLUG CO (JP)

International Classes:

H01T13/20; H01T13/32

Foreign References:

JP2002141154A	2002-05-17
JPS5077738A	1975-06-25
US6064144A	2000-05-16
JPH08171976A	1996-07-02

Other References: