Steplessly variable hydraulic drive system for vehicle

Details Steplessly variable hydraulic drive system for vehicle Steplessly variable hydraulic drive system for vehicle

1976-11-18

1978-03-07

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

60429, 60464, 60486, F15B 1309

Patent

active

040772110

ABSTRACT:
A hydrostatic drive system for connecting a prime mover and a hydraulically operable load such as a hydraulic motor connected to the vehicular wheel has a constant-displacement pump and a variable-displacement pump both connected to the prime mover. The variable-displacement pump is completely reversible and is of maximum displacement substantially greater than the constant displacement pump. This variable-displacement pump is permanently connected across the hydraulic motor of the load. A clutch connects the constant-displacement pump to the same shaft as the variable-displacement pump. The outputs of the constant-displacement pump may be connected by a valve either in parallel to the outputs of the variable-displacement pump, or may simply connect them together for operation of the load only by the variable-displacement pump.

REFERENCES:
patent: 3038312 (1962-06-01), Marsh
patent: 3092970 (1963-06-01), Sampietro
patent: 3972187 (1976-08-01), Ital et al.

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