Spark plug
Number of patents in Portfolio can not be more than 2000
United States of America
Stats
-
Sep 24, 2019
Grant Date -
May 2, 2019
app pub date -
May 25, 2017
filing date -
May 25, 2017
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Provided is a spark plug capable of ensuring fouling resistance with a simple configuration. An insulator includes a step portion formed on an outer circumferential surface thereof. A center electrode is arranged in an axial hole of the insulator. A cylindrical metal shell having a shelf portion formed on an inner circumferential surface thereof is arranged radially outside the insulator. The insulator further includes a front end portion located frontward of the step portion. An outer circumferential surface of the front end portion has an arithmetic average roughness of 0.5 μm or smaller in a circumferential direction. A recess is formed with a depth of 3 to 20 μm in at least part of an end surface and the outer circumferential surface of the front end portion so as to extend from the front toward the rear.
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