Spark plug having ground electrode having cross section with side surface opposite center electrode of smaller width than opposing side surface
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United States of America Patent
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-
May 4, 2004
Grant Date -
Jun 21, 2001
app pub date -
Dec 19, 2000
filing date -
Dec 20, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a spark plug for an internal combustion engine, a welded portion of a ground electrode has a polygonal cross section including six corners. A side surface of the ground electrode, positioned opposite to a side surface including a surface portion opposite to a front end face of a center electrode, is smaller in width than the opposite side surface so that the ground electrode can be larger in width and thickness than a spark plug of a related art without causing the corners of the cross section of the ground electrode at the joint between the ground electrode and a metallic shell to protrude from a front end face of a metallic shell.
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