Torque control oil pump with low parasitic loss and rapid pressure transient response
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United States of America Patent
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-
Jan 6, 2004
Grant Date -
Jun 26, 2003
app pub date -
Dec 21, 2001
filing date -
Dec 21, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A torque control crescent oil pump, having low parasitic loss and rapid pressure transient response, and a method for controlling oil flow within the pump, are provided. In one embodiment, the crescent oil pump comprises a housing, toothed annular gears cooperatively rotating about preferably offset first and second axes, and a crescent body. The crescent body is adapted to move from a first position to a second position. In the first position, the crescent body is adapted to form a seal between the annular gears. In the second position, the crescent body is positioned so that it does not form a seal between the annular gears. In another embodiment, an actuating device moves the crescent body from the first position to the second position.
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