Hydrostatic transmission with integral auxiliary pump

Details Hydrostatic transmission with integral auxiliary pump Hydrostatic transmission with integral auxiliary pump

1976-05-24

1977-08-16

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60465, 60468, 60486, 60DIG10, 417216, F16H 3946, F15B 1518

Patent

active

040417034

ABSTRACT:
A hydrostatic transmission is disclosed which includes a pump assembly in which a main pump, a charge pump, and an auxiliary pump are commonly housed and are drivingly connected to a single shaft assembly. An external fluid connection is provided through which fluid is directed from the auxiliary pump to a power take off, and valving is provided to short circuit the auxiliary pump when power is not demanded. Means of controlling the rate of operation of the valve are also provided to prevent excessive pressure rise rates at the outlet of the auxiliary pump upon actuation of the valving.

REFERENCES:
patent: 2560283 (1951-07-01), Giesey
patent: 2938347 (1960-05-01), Sturgis
patent: 2942581 (1960-06-01), Gaffney
patent: 3672166 (1972-06-01), Isaac
patent: 3708978 (1973-01-01), Reiff et al.

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