Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1995-01-10
1995-10-31
Yusko, Donald J.
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
313125, 313134, 313142, H01T 1326
Patent
active
054632676
ABSTRACT:
In spark ignited engine configurations, it is common to provide a spark plug that has a spark gap that has dimension that will accommodate good starting capabilities for the engine. In some cases, this spark gap is larger than required for the engine to run efficiently, especially at high loads. As a result, the voltage required to bridge the gap when the engine is running at high loads is much higher than necessary and causes erosion of the electrode and a build up of deposits on the ground strap. Ultimately, this greatly reduces the life of the spark plug. The present invention provides a spark plug that utilizes an adjusting means that is connected to the electrode of the spark plug and functions to move the electrode with respect to the ground strap to adjust the gap therebetween. The adjusting means is responsive to the temperature of the spark plug which will vary with engine loads or an increase in pressure within the combustion chamber.
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Caterpillar Inc.
Patel N. D.
Perry William C.
Yusko Donald J.
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