Hydraulic circuit for a hydraulically driven vehicle

Details Hydraulic circuit for a hydraulically driven vehicle Hydraulic circuit for a hydraulically driven vehicle

1979-11-28

1982-03-02

Cohen, Irwin C.

Power plants

Pressure fluid source and motor

Having a mechanical clutch or brake device in the power train

60441, 60442, 60468, 180271, 180307, F16H 3904, F16H 3946

Patent

active

043173314

ABSTRACT:
A hydraulic circuit for a hydraulically driven vehicle comprising an engine, a variable displacement pump driven by the engine, a hydraulic motor connected with the variable displacement pump and driven thereby, the hydraulic motor having an output shaft connected thereto, a first fixed displacement pump driven by the engine, an inching brake valve connected with the first fixed displacement pump, a control valve connected with the output side of the inching brake valve for controlling the forward and reverse movement of the vehicle and speed thereof, the output side of which is connected with the variable displacement pump, a parking brake coupled with the output shaft of the hydraulic motor, the parking brake being normally applied by a spring and hydraulically released, a pilot operated first brake control valve connected with the parking brake, a manually operated pump connected with the first brake control valve and the inching brake valve, a pilot operated second brake control valve connected with the first brake control valve, a pilot port thereof being connected with the output side of the control valve, and a second fixed displacement pump driven by the engine and connected with the second brake control valve.

REFERENCES:
patent: 3475903 (1969-11-01), Christenson
patent: 3750406 (1973-08-01), Verlinde et al.
patent: 4043125 (1977-08-01), Kubik
patent: 4194365 (1980-03-01), Stoufflet et al.

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