Spark plug having improved ground electrode orientation and method of forming
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United States of America Patent
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Feb 13, 2018
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N/A
app pub date -
Jan 26, 2017
filing date -
Jan 13, 2011
priority date (Note) -
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Abstract
A method of manufacturing a spark plug (20) for being threaded into a cylinder head (28) of an internal combustion engine is provided. The spark plug (20) includes a shell (24) with threads (26) disposed at a predetermined rotational position (a) relative to a shell outer surface (64) and ground electrode (34). The position of the threads (26) relative to the ground electrode (34) places the ground electrode (34) in a desired position in the combustion chamber (22) and relative to components of the engine, thus allowing the ground electrode (34) to provide a robust and reliable ignition. When multiple spark plugs (20) are formed, the threads (26) in each of the shells (24) are repeatedly and accurately formed at the predetermined rotational position (α) by locating the ground electrode (34), threads (26), and dies (76) of a thread forming apparatus (102) in specific locations.
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