Control system for hydraulically driven vehicle

Details Control system for hydraulically driven vehicle Control system for hydraulically driven vehicle

1980-04-25

1983-08-02

Walton, George L.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60444, 60465, 60488, 180 648, 180307, F16H 3946

Patent

active

043958788

ABSTRACT:
A control system for a hydraulically driven vehicle having a pair of closed loop each including a variable displacement hydraulic pump driven by an engine and a variable displacement hydraulic motor, the control system comprising a charge pump driven by the engine, a directional control valve for speed control and forward and reverse change-over of the vehicle connected with the charge pump, a pair of steering valves connected with the directional control valve, a pair of servo controls each operatively connected with the respective variable displacement hydraulic pumps for controlling the displacement volume thereof, another charge pump driven by the engine, and a manually operated selector valve connected with the another charge pump and the servo controls, the selector valve having formed therein a throttling position and a communication position and normally held in the throttling position and being interlocked with the operation of the steering valves, whereby the selector valve is changed-over to its communication position when either one of the steering valves is manually operated.

REFERENCES:
patent: 3788773 (1974-01-01), Vander Kolk
patent: 3788774 (1974-01-01), Roesslein
patent: 3946560 (1976-03-01), MacIntosh
patent: 3999387 (1976-12-01), Knopf
patent: 4188789 (1980-02-01), Hamma

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