Motor vehicles – Having four wheels driven – Including pump and fluid motor – or generator and electric...
Patent
1979-12-05
1981-10-20
Pekar, John A.
Motor vehicles
Having four wheels driven
Including pump and fluid motor, or generator and electric...
60445, 60489, 60490, B60K 2504
Patent
active
042955394
ABSTRACT:
A hydraulic auxiliary drive system for the normally non-driven wheels of a vehicle to assist the main wheels. The auxiliary drive comprises at least one variable displacement motor having a swash plate for driving at least one of the non-driven wheels, a variable displacement pressure compensated pump supplying the motor with a constant pressure regardless of vehicle speed, a spring for biasing each motor swash plate toward zero displacement, a servo connected to the motor swash plate for varying the displacement of the motor, and a pressure source for supplying the servo. A manually operated pressure control includes a solenoid-controlled variable orifice for controlling the pressure level supplied to the servo to vary the torque output of the normally non-driven wheels. A control valve is positioned between the pump and motor for disengaging and reversing the auxiliary drive. Another embodiment includes a second servo connected to the motor swash plate for decreasing the motor displacement. A pressure operated valve is located in a sensing passage connecting the pump outlet with the second servo and has a first position blocking pump pressure to the servo at all levels above the pressure compensating level of the pump, and a second position opening pump pressure to the second servo at a preset pressure level below the compensating level whereby when the pump reaches full stroke and is unable to maintain its compensating level, the valve opens causing the motor displacement to decrease.
REFERENCES:
patent: 3354978 (1967-11-01), Budzich
patent: 3984978 (1976-10-01), Alderson
Beck Richard A.
Presley Glen T.
Brown, Jr. Edward L.
Parno Corporation
Pekar John A.
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