Glow plug with improved seal, heater probe assembly therefor and method of construction thereof
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United States of America Patent
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Apr 2, 2013
Issued Date -
N/A
app pub date -
Oct 22, 2009
filing date -
Oct 23, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heater probe assembly, a metallic glow plug assembly therewith and method of constructing the heater probe assembly is provided. The metallic glow plug assembly includes a metal shell having a through bore and a metal sheath extending between a distal end and a terminal end. The terminal end of the metal sheath is fixed in the through bore of the shell. Further, an electrode is provided having an end with a heating element attached to thereto. The heating element and end of the electrode are received in the sheath. A packing powder is disposed in the sheath about the heating element. Further, a ceramic seal has an outer surface attached to the sheath by a braze joint and an inner surface attached to the electrode by a braze joint. The ceramic seal provides a hermetic seal between the packing powder and an environment external to the sheath.
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