Electric heating – Heating devices – Resistive element: igniter type
Patent
1990-05-17
1992-01-28
Reynolds, Bruce A.
Electric heating
Heating devices
Resistive element: igniter type
219552, 219553, 123298, 123145A, 361266, F23Q 722
Patent
active
050846060
ABSTRACT:
The service life of conventional glow plugs is extremely short when they are continuously energized at an elevated temperature during engine operation in order to assist ignition of non-autoignitable fuels. Such glow plugs typically fail due to thermal stresses and/or oxidation and corrosion.
Herein is disclosed an improved heating element assembly adapted for incorporation in a glow plug. The heating element assembly includes a monolithic sheath having a relatively-thin and generally annular wall defining a blind bore. The heating element assembly further includes a heating device positioned in the blind bore and adapted to emit heat, and a heat transfer device adapted to transfer heat from the heating means to the sheath. The heating device includes a heating filament and a ceramic insulator. THe heating filament is protected against oxidation by being encapsulated in the insulator. The insulator is protected against corrosion by being encapsulated in the sheath. The sheath is formed of a preselected material which is chosen and configured so as to minimize failure of the heating element assembly caused by thermal stresses, oxidation and/or corrosion.
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U.S. application No. 07/386,064, Titled: Interference Connection Between a Heating Element and Body of a Glow Plug, filed Jul. 28, 1989, by Scott F. Shafer et al.
Exhibit A, by Kyocera Corp.
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Bailey John M.
Blanco Michael M.
Shafer Scott F.
Towe Carey A.
Caterpillar Inc.
Hoang Tu
Reynolds Bruce A.
Woloch Anthony N.
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