Spark plug for internal combustion engine
AssigneeNgk Spark Plug Co., Ltd.
InventorsShigeyasu Yamada, Kazumi Kawamura, Shuji Nakamura
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Abstract
A spark plug for an internal combustion engine with both sides of a surface, on a center electrode side, of an outer electrode and/or both side portions, on the top surface of the center electrode, form wedge-shaped projections. At least one surface having the wedge-shaped projection has no plane surface but is arcuate.
Claims7
A spark plug for an internal combustion engine comprising an insulating body member, a center electrode extending from said body member and having a top surface, said top surface of said center electrode configured as a concave surface, an outer electrode having an inner surface facing said top surface, said outer electrode inner surface configured as a rounded concave surface opposing said top surface, said rounded concave surface having wedge-shaped edge projections forming spark gaps with the opposing center electrode top concave surface.
Dependencies are inferred from the claim text.