IGNITION PLUG - NGK SPARK PLUG CO

Title:

IGNITION PLUG

Document Type and Number:

WIPO Patent Application WO/2014/125811

Kind Code:

A1

Abstract:

Provided is an ignition plug which is capable of ensuring both high air tightness and high resistance against disengagement. An ignition plug (1) is provided with a main metallic section (3) and a solid annular gasket (18). The main metallic section (3) has a male thread section (15) for mounting and a seat section (16) which protrudes outward in the radial direction. The gasket (18) is provided between the male thread section (15) and the seat section (16). The surface of the gasket (18) which is located on the side opposite the seat section (16) has formed therein the opening of a recess (41) having a depth in the axial direction (CL1). The gasket (18) has: an inner peripheral front end surface (351), the distance of which from at least a reference plane (VS) decreases toward the inner peripheral side, the reference plane (VS) being a plane which passes through the rear end of the recess (41) and which is perpendicular to the axis (CL2) of the gasket (18); and an outer peripheral front end surface (352) which is located closer to the outer peripheral side than the inner peripheral front end surface (351). The opening of the recess (41) is formed at a position closer to the inner peripheral side than the innermost periphery of the outer peripheral front end surface (352).

Inventors:

SHIMAMURA TAKUYA (JP)
KYUNO JIRO (JP)

Application Number:

PCT/JP2014/000710

Publication Date:

August 21, 2014

Filing Date:

February 12, 2014

Export Citation:

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Assignee:

NGK SPARK PLUG CO (JP)

International Classes:

H01T13/08; F02P13/00

Domestic Patent References:

WO2012147503A1

2012-11-01

Foreign References:

JP2013020790A	2013-01-31
JPH025648U	1990-01-16
JPH06283249A	1994-10-07
JP2006236906A	2006-09-07

Other References: