Internal-combustion engines – Igniters – Sparkers
Patent
1983-09-06
1985-01-01
Argenbright, Tony M.
Internal-combustion engines
Igniters
Sparkers
123169R, 313118, 313143, H01T 1316
Patent
active
044911017
ABSTRACT:
A spark plug having a heat pipe located between the insulating core and the shell in the skirt portion thereof to vary the heat range automatically in response to the operating conditions of the engine in which it is fitted. The heat pipe is charged with a non-condensible gas and a working medium that undergoes a phase change at a predetermined design temperature to transport heat by means of an evaporation-condensation cycle from the firing end of the spark plug to prevent the overheating thereof. Below the design temperature, the heat pipe is thermally non-conducting such that the firing end of the spark plug is allowed to reach a temperature that will burn off combustion deposits that cause misfiring. In one embodiment, the heat pipe is fabricated as a separate integral annular element which is installed in the skirt of the spark plug during the manufacture thereof. In another embodiment, the separate integral heat pipe element has a thin-wall construction in which a resilient wire-screening wicking system provides the required structural integrity and a thin-walled envelope acts as a containment system for the working medium. In further embodiments, the open end of the skirt of the spark plug itself is sealed off with an end wall such that a heat pipe is formed in the annular volume between the insulating core and the shell bore.
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