SPARK PLUG - NGK SPARK PLUG CO

Title:

SPARK PLUG

Document Type and Number:

WIPO Patent Application WO/2011/125267

Kind Code:

A1

Abstract:

Provided is a spark plug which includes electrode chips comprising Pd as the main component, the electrode chips having improved sparking wear resistance and being inhibited from suffering separation/breakage. The spark plug has an electrode chip at the tip of each electrode, wherein the electrode chip comprises Pd as the main component, has a Pd content of 40 wt.% or more, and contains at least one element selected from Ir, Ni, Co, and Fe. When Ir is contained, the Ir content is 0.5-20 wt.%. When at least one element selected from Ni, Co, and Fe is contained, the content of each element is 0.5-40 wt.%. The electrode chip further contains at least one element selected from Pt, Re, Rh, and Ru, the total content of Pt, Re, Rh, and Ru being 5-40 wt.%. When one or more of Re, Rh, and Ru elements are contained, the total content of the elements is 10 wt.% or less. When Pt is contained, the Pt content is 16-40 wt.%.

Inventors:

SHIBATA TSUTOMU (JP)
TANAKA TOMOO (JP)
SUMOYAMA DAISUKE (JP)
KIKAI TAKAAKI (JP)

Application Number:

PCT/JP2011/000213

Publication Date:

October 13, 2011

Filing Date:

January 18, 2011

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NGK SPARK PLUG CO (JP)
SHIBATA TSUTOMU (JP)
TANAKA TOMOO (JP)
SUMOYAMA DAISUKE (JP)
KIKAI TAKAAKI (JP)

International Classes:

C22C5/04; C22C30/00; F02P13/00; H01T13/39; C22C19/03

Domestic Patent References:

WO2008014192A1

2008-01-31

Foreign References:

JPS59226487A	1984-12-19
JPS6174283A	1986-04-16
JP2009545124A	2009-12-17
JP2002313524A	2002-10-25
JPS4421551B1
JPS59113143A	1984-06-29
JPS50138369A	1975-11-04
JPH0547954B2	1993-07-20
JPH1022053A	1998-01-23
JP2002083663A	2002-03-22

Other References: