Internal vent for reducing seal pressure in prelubrication pump assembly
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United States of America Patent
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Apr 8, 2003
Issued Date -
N/A
app pub date -
Sep 27, 2000
filing date -
Jul 18, 1997
priority date (Note) -
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Abstract
An engine prelubrication pump includes a pump housing with a pump cavity in which a first and second gear are positioned for pumping fluid. The first gear is operably and sealably connected to a motor for rotation and the second gear is rotatably mounted to a second shaft for geared rotation with the first gear. Fluid inlet and outlet ports are located in communication with the pump cavity and adapted respectively for connection with a source of fluid and a discharge means and an internal vent is positioned in between the armature shaft of bore and the pump housing along the inlet port. Alternatively, a valve is positioned between the inlet and outlet ports to selectively permit fluid pumped between the inlet and outlet ports to pass through when the outlet port is flow restricted.
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