Spark plug for internal combustion engines and mounting structure for the spark plug
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United States of America Patent
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May 17, 2016
Grant Date -
Oct 30, 2014
app pub date -
Oct 31, 2012
filing date -
Nov 1, 2011
priority date (Note) -
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Abstract
A spark plug for an internal combustion engine includes a housing, an insulation porcelain, a center electrode and a ground electrode. Both of a tip portion of the center electrode and an opposing portion of the ground electrode are provided with respective projection portions which are projected toward a spark discharge gap. At least one of the projection portions has an opposing face that confronts the spark discharge gap and is inclined with respect to a plane perpendicular to an axial direction of the plug. The spark discharge gap is configured to be gradually enlarged, in one direction perpendicular to the axial direction of the plug, from a narrow gap on one end side toward a wide gap on the other end side.
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