Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1973-09-26
1976-11-02
Scott, Samuel
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60435, 60466, 180 648, F16D 3102
Patent
active
039888932
ABSTRACT:
An improved drive system includes a pair of hydrostatic transmissions which are driven by a common engine or prime mover and are drivingly connected with different tracks of a vehicle. The input to output speed ratios of the hydrostatic transmissions are simultaneously varied by operating a single speed control valve to port control fluid pressure to pressure responsive secondary or control motors in pump and motor actuators of the hydrostatic transmissions. A pair of charge pumps are provided to charge the hydrostatic transmissions and provide control fluid. If the fluid pressure output of either of the charge pumps falls below a predetermined level, a control arrangement reduces the control fluid pressure transmitted to the pump and motor actuators by the speed control valve to deswash or destroke both of the transmissions. The control arrangement also short circuits the hydrostatic loops interconnecting the pump and motor units. In addition, the brakes of the vehicle are engaged to stop the vehicle. When the vehicle is to be stopped during normal operation, actuation of the brakes causes the control arrangement to effect a deswashing of the pump and motor units and a short circuiting of the hydrostatic loops.
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Bojas Edward J.
Ward Harold R.
Eaton Corporation
Ratliff, Jr. Wesley S.
Scott Samuel
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