Spark plug with specific construction to avoid unwanted surface discharge
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United States of America Patent
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Jun 20, 2000
Grant Date -
N/A
app pub date -
Nov 10, 1998
filing date -
Nov 10, 1997
priority date (Note) -
Expired
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Abstract
A spark plug for an internal combustion engine comprises a tubular metal ground shell, a first electrode passing through the interior of the shell, a ceramic insulator sealing the space between the shell and the first electrode and a second electrode extending from the shell to define a gap with the first electrode. The ratio of effective distance along the surface of the ceramic defining the potential surface discharge path to the distance between the first and second electrodes being selected to prevent surface discharge as the spark gap erodes.
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