Gear pump having members with different hardnesses
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United States of America Patent
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-
Jul 28, 1998
Issued Date -
N/A
app pub date -
Jan 7, 1997
filing date -
Sep 1, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved gear pump having members with different hardnesses includes a housing defining an internal bore with inlet and outlet passageways. A head member includes a wall between the inlet and outlet passageways and extends toward a toothed rotor. A toothed idler gear meshes with the rotor. The head member and idler gear are made of materials having a hardness greater than that of the rotor material. In one embodiment the idler gear is made of ceramic material whereas the head member and rotor are made of cast iron, with the head member treated to have a hardness greater than that of the rotor.
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