SPARK PLUG HAVING PRESSURE SENSOR
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United States of America Patent
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Issued Date -
May 5, 2011
app pub date -
Jul 2, 2009
filing date -
Jul 2, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A spark plug is intended for combustion engines and comprises a metal housing having a ground electrode disposed at the front and a thread having a rear sealing surface for installation in the combustion engine. The spark plug in particular includes a pressure sensor disposed laterally in the housing for determining a combustion chamber pressure and a ceramic body having a center electrode. The ceramic body is disposed in the housing next to the pressure sensor and acting as an electric insulator. As viewed from the combustion chamber, the ceramic body defines a front clamping shoulder and a rear stop for clamping the ceramic body into the housing. The outside diameter of the ceramic body gradually decreases in the region of the thread located between the rear sealing surface and the front clamping shoulder.
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