Glow plug for internal combustion engine
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Apr 4, 1989
filing date -
Apr 6, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A glow plug including a shell provided with an axially extending bore and a tubular sheath partially located in the bore and partially projecting from the shell. At least a first electrical resistance is located in the portion of the sheath extending outside the shell. The tubular sheath is filled with two different powders. Both powders have good electrical insulating characteristics. The first powder is located in the free closed end of the sheath and has good thermal conductivity characteristics. The second powder is located in the portion of the sheath located in the shell bore and has good thermal insulating characteristics. The interface between the two powders can be varied with the design of the glow plug and the type of resistance located in the sheath.
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