Spark plug
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United States of America Patent
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-
Dec 11, 2018
Grant Date -
Jan 18, 2018
app pub date -
Jun 22, 2017
filing date -
Jul 18, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A spark plug having an insulator with a front end portion having an annular groove opened to a front side around an axial line. The groove has a width of greater than or equal to 0.2 mm in a radial direction. In a cross section including the axial line, a value D/L obtained by dividing, by a length L, a creepage distance D, from a position P on the frontmost side of a region in which a clearance distance between an outer surface of a front end portion and an inner circumferential surface of a metal shell is less than or equal to 0.1 mm to a connection position between an outer surface of the front end portion and the axial hole, is greater than or equal to 1.1.
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