Positive displacement pump including an unloading device
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United States of America Patent
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Jun 4, 2019
Grant Date -
Nov 2, 2017
app pub date -
Apr 27, 2016
filing date -
Apr 27, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A transfer pump configured to move a hydraulic fluid in a hydraulic fluid management system of a hydraulic system of a vehicle including a transmission. In one embodiment, the transfer pump moves the fluid from a differential case to a hydraulic reservoir coupled to the transmission. The transfer pump is a positive displacement pump including an unloading device, such as a sealing plate, that is resiliently biased against the pump during a normal operation but is moved away from the pump upon the application of a pilot pressure. The result is an open chamber for the pump gears to turn without developing pressure, to thereby reduce parasitic losses.
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