Control system for a hydraulically driven vehicle

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

1980-05-30

1982-07-27

Braun, Leslie

Machine element or mechanism

Gearing

With fluid drive

74645, 74655, 74730, 74752C, F16H 4700

Patent

active

043411339

ABSTRACT:
A control system for a hydraulically driven vehicle having a pair of variable displacement hydraulic pumps driven by an engine and a pair of hydraulic motors each being connected with the respective variable displacement hydraulic pumps in a closed loop and driven thereby. The control system comprises a pair of servo valves each for controlling the displacement of the respective variable displacement hydraulic pumps, a servo control valve for controlling the servo valve and a manually operated change-over valve connected with a fixed displacement charge pump and with the servo control valve, the change-over valve being normally held in a communication position and being adapted to be changed over to an offset position when operated where the output side of the fixed displacement charge pump is connected with a tank.

REFERENCES:
patent: 3081647 (1963-03-01), Blenkle
patent: 3085448 (1963-04-01), Finlayson
patent: 3302487 (1967-02-01), Kempson
patent: 3463034 (1969-08-01), Miller
patent: 4078452 (1978-03-01), Rosler

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