Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1972-10-10
1976-09-07
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60448, F16H 3946
Patent
active
039786684
ABSTRACT:
The transmission drives a dispensing apparatus at a speed varying in proportion to a command value furnished by a command device. The transmission includes a hydromotor driving the dispensing apparatus, a main pump driving the hydromotor, and a regulating arrangement for making the variations in the speed of the hydromotor proportional to the variations in the command value. The regulating arrangement includes first and second measuring pumps driven by the hydromotor and by the command device for generating control pressures respectively indicative of the hydromotor speed and the command value. The regulating arrangement further includes a hydraulic control device connected to receive the control pressures and operative for automatically varying the fluid output of the main pump in dependence upon the difference in the control pressures. First and second flow restrictors lead from the fluid outputs of the respective measuring pumps to an unpressurized space to partially relieve the control pressure generated by the respective measuring pumps and establish the ratio between the command value variations and the hydromotor speed variations.
REFERENCES:
patent: 2291011 (1942-07-01), Vickers
patent: 3866420 (1975-02-01), Appel
Geoghegan Edgar W.
Robert Bosch G.m.b.H.
Striker Michael J.
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