Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1981-10-23
1984-08-07
Look, Edward K.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
13762517, 1376253, F16D 3102
Patent
active
044635591
ABSTRACT:
A hydrostatic transmission between a prime mover and a load, e.g. for driving an automotive vehicle, especially an automotive vehicle requiring a high degree of maneuverability such as a fork lift truck, comprises a reversible-output variable displacement pump connected to a motor which, in turn, drives the load. The control element of the pump is operated by a hydraulic piston-and-cylinder arrangement biased into a neutral position between positions of forward and reverse operation of the pump and pressurization of the oppositely effective chambers in this arrangement is controlled by a pedal-operated "inch" valve whose flow cross section progressively increases with pedal actuation and controls the return of the pressure medium to the reservoir. The valve is designed so that even when the prime mover operates at high speed, starting movements of the pedal provide sensitive movement of the vehicle.
REFERENCES:
patent: 3186162 (1965-06-01), Pignolet et al.
patent: 3187775 (1965-06-01), Pinnell
patent: 3297051 (1967-01-01), Church et al.
patent: 4075841 (1978-02-01), Hamman et al.
patent: 4188789 (1980-02-01), Hamma
Dubno Herbert
Look Edward K.
Ross Karl F.
Zahnradfabrik Friedrichshafen A.G.
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