Electric heating – Heating devices – Resistive element: igniter type
Patent
1990-05-17
1991-12-24
Reynolds, Bruce A.
Electric heating
Heating devices
Resistive element: igniter type
219552, 219553, 123298, 123145A, 361266, F23Q 722
Patent
active
050755366
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 is protected by the sheath 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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Bailey John M.
Blanco Michael
Shafer Scott F.
Towe Carey A.
Caterpillar Inc.
Hoang Tu
Reynolds Bruce A.
Woloch Anthony N.
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