Spark plug for internal combustion engine
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United States of America Patent
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Nov 13, 1990
Grant Date -
N/A
app pub date -
Sep 16, 1988
filing date -
Sep 17, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The spark plug according to the invention comprises a shell (1), a central electrode (3) surrounded by an insulator (2) and a ground electrode (4) which, according to the invention, has a cross section (4a) such that the surface of the ground electrode (4) which is located nearest to the bottom end of the central electrode (3) is larger than the surface of the ground electrode (4) which is located farthest away from said bottom end of the central electrode (3). The ground electrode (4) may be provided with a copper core and its surface nearest to the bottom end of the central electrode (3) may be provided with a precious metal insert. The surface of the ground electrode which is farthest away from the bottom end of the central electrode (3) may be reduced to a line and the lateral surfaces of the ground electrode may be curved surfaces.
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