SPARK PLUG

WIPO Patent Application WO/2013/076887

A1

The invention prevents deformation at a ground electrode tip while achieving high ignitability. A spark plug (1) comprises: a body (3) having a screw portion (15) with a screw diameter of M10 or less; a center electrode (5); and a ground electrode (27) that is bent at a bend portion (27B), and forms a spark discharge gap (28) with the center electrode (5). In a section plane that is at a base end portion of the ground electrode (27) and is perpendicular to an axis (CL1), among the angles formed by two tangent lines (TL1, TL2) drawn from the axis (CL1) to the outline of the ground electrode (27), the angle (θ) on the ground electrode (27) side is no more than 30°. In a section plane that is perpendicular to the center axis (CL2) of the ground electrode (27) at the location closest to the tip of the ground electrode (27), said location being within the bend portion (27B): the center of gravity (GP) of the ground electrode (27) is positioned closer to a plane (27S) than to a position corresponding to half the thickness of the ground electrode (27); and the thickness-direction distance between the center (CP) of the ground electrode (27) and the center of gravity (GP) of the ground electrode (27) is at least 4% of the thickness of the ground electrode (27).

SUZUKI KAORI (JP)
KATO TOMOAKI (JP)

PCT/JP2012/004908

May 30, 2013

August 02, 2012

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NGK SPARK PLUG CO (JP)
SUZUKI KAORI (JP)
KATO TOMOAKI (JP)

H01T13/32; H01T13/20

WO2009153927A1

2009-12-23

JP2010086951A	2010-04-15
JPH05182743A	1993-07-23
JPS50157732A	1975-12-19
JP2003007423A	2003-01-10
JPH08213149A	1996-08-20

AOKI, Noboru et al. (JP)
Aoki 昇 (JP)

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