Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1978-02-01
1979-11-20
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60451, 60484, 180308, F16H 3946
Patent
active
041746147
ABSTRACT:
A vehicle drive system including a wheel adapted to at least partially propel a vehicle over underlying terrain and a hydraulic motor coupled to the wheel to drive the same. A flow and pressure compensated pump has an output for providing hydraulic fluid under pressure to the motor and includes a control system having an input for receiving a hydraulic signal and for controlling pressure and flow output characteristics of the pump. A manually settable, pressure reducing valve interconnects the pump output and the control system input to provide a substantially constant, but adjustable, pressure signal to the control system so that output pressure from the pump to the motor may be controlled independently of loading on the motor to set the maximum torque delivery of the motor at a desired value.
REFERENCES:
patent: 3543508 (1970-12-01), Schwab
patent: 3550617 (1970-12-01), Johnson
patent: 3984978 (1976-10-01), Alderson
patent: 4033236 (1977-07-01), Johnson et al.
Caterpillar Tractor Co.
Geoghegan Edgar W.
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