Spark plug
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United States of America Patent
Stats
-
Jan 30, 2018
Grant Date -
Oct 5, 2017
app pub date -
Mar 8, 2017
filing date -
Mar 29, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A spark plug includes an insulator having an axial hole extending along an axial line, a center electrode disposed in the axial hole, a tubular metallic shell surrounding the insulator, a ground electrode whose proximal end is fixed to the metallic shell, and a cylindrical noble metal tip fixed to the ground electrode via an intermediate tip so as to form a gap between the noble metal tip and the center electrode. A weld portion is provided between the noble metal tip and the intermediate tip. The weld portion has a diameter larger than that of a portion of the intermediate tip which is adjacent to the weld portion. The noble metal tip is located inside a virtual tapered cylindrical surface which extends from a peripheral edge of a gap-side end of the center electrode so as to contact an outer circumferential edge of the weld portion.
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