Spark plug having a recess formed in an electrode
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United States of America Patent
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Apr 28, 2020
Grant Date -
Aug 1, 2019
app pub date -
Jan 28, 2019
filing date -
Jan 29, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
A spark plug is provided which includes a hollow cylindrical center electrode disposed inside a metal shell and a ground electrode joined to the metal shell. The ground electrode has an inner peripheral surface facing an outer peripheral surface of the center electrode. At least one of the outer periphery of the center electrode and the inner periphery of the ground electrode has formed therein at least one recess whose ends lies in a center-to-ground electrode facing region where the outer peripheral surface of the center electrode faces the inner peripheral surface of the ground electrode in a radial direction of the center electrode. This decreases voltage required by the spark plug to achieve discharge.
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