Internal-combustion engines – Igniters – Incandescent
Patent
1998-10-26
2000-06-20
Kwon, John
Internal-combustion engines
Igniters
Incandescent
F02B 908
Patent
active
060764937
ABSTRACT:
A glow plug shield centrally receives a glow plug which, typically, has a silicon nitride surface. The shield and plug are spaced radially from a fuel injector disposed centrally of a cylinder head. The shield and glow plug extend into a combustion chamber where the shield has an oblique end exposing the circumferential portion of the plug which faces the injector. This shield configuration protects the glow plug from cooling by inlet air, increases the residence time of air/fuel mixture around the plug, and improves flame propagation so that plug temperature and electrical power can be reduced to extend glow plug life. The shield has a coating exteriorly and interiorly covering the portion of the shield extended into the combustion chamber. The coating is of thermally insulating, high temperature resistant ceramic material and acts as a thermal barrier to further reduce glow plug cooling. A combustion catalyst such as platinum or palladium may be incorporated into the coating to further reduce the required glow plug temperature and electrical power.
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Koshkarian Kent A.
Miller Robert L.
Suda Kenneth J.
Cain Larry G.
Caterpillar Inc.
Church Stephen J.
Kwon John
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