Power transmission

Details Power transmission Power transmission

1987-04-24

1988-03-22

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60494, 417295, 417307, F16D 3102

Patent

active

047319992

ABSTRACT:
A hydraulic system comprised of a pump, a first valve in the inlet to the pump, and a second valve which activates or deactivates a third valve which permits the loading and unloading of the pump discharge. A motor is provided to operate the first valve for opening or closing the pump inlet. This motor also actuates the second valve in concert with the operation of the first valve to open or close a vent port to the third valve which opens or closes the passage from the pump discharge to tank, located away from the pump inlet. This permits unloading the pump discharge during the restriction of the pump inlet and allows the loading of the pump discharge after the opening of the pump inlet. With the pump inlet restricted, the system provides a low restrictive passage for circulating the prescribed small volume of flow used to lubricate and cool the pump.

REFERENCES:
patent: 3449911 (1969-06-01), Schlosser
patent: 3978666 (1976-09-01), Kelley et al.

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