Spark plug
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United States of America Patent
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Jun 22, 2010
Grant Date -
Mar 6, 2008
app pub date -
Aug 28, 2007
filing date -
Aug 29, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A spark plug including a center electrode; an insulator; a metal shell; a ground electrode; and an annular packing, all as defined herein, wherein the packing has a hardness greater than or equal to a hardness of the stepped portion of the metal shell or has a Vickers hardness of not less than 300 Hv. Preferably, a difference between the hardness of the packing and the hardness of the stepped portion of the metal shell is from 120 Hv to 160 Hv, and the packing has a Vickers hardness of not more than 500 Hv.
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