SPARK PLUG
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United States of America Patent
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Issued Date -
Nov 5, 2015
app pub date -
Apr 30, 2015
filing date -
May 2, 2014
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A spark plug includes an insulator with an axial through hole, a center electrode disposed in a front side of the through hole and a metal terminal disposed in a rear side of the through hole. The spark plug further includes a front conductive glass seal layer, a first resistor, a rear conductive glass seal layer, a seal contact member, a second resistor and a conductive elastic material arranged, in this order from the front to the rear, between the center electrode and the metal terminal within the through hole. The first resistor is formed containing at least a conductive material and a glass material. The second resistor is formed as a wire wound resistor having 30 or more turns of wire.
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