Positive neutral control for hydrostatic transmission

Details Positive neutral control for hydrostatic transmission Positive neutral control for hydrostatic transmission

1979-04-27

1980-07-08

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Having correlated or joint actuation of controller of input...

60444, 60487, 91506, F16H 3946

Patent

active

042110793

ABSTRACT:
A hydrostatic transmission includes a reversible, variable displacement pump having a swashplate actuator controlled by a pilot-operated displacement control valve. A manually operated displacement control lever is manipulated to opposite sides of a neutral position to effect command signals for causing pilot operation of the displacement control valve to control movement of the swashplate in accordance with the command. A neutral control valve is coupled to the displacement control lever and is operated thereby to a neutral position, wherein it connects the swashplate actuator to sump, when the lever is moved to its neutral position.

REFERENCES:
patent: 3411297 (1968-11-01), Hann
patent: 3636705 (1972-01-01), Howard et al.
patent: 3803987 (1974-04-01), Knapp

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