Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1995-06-09
1997-06-17
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60448, F16Q 3102
Patent
active
056386788
ABSTRACT:
A hydraulic drive system includes a first driven hydrostatic machine adjustable in volume and operating as a pump supplying fluid to a supply line for maintaining an impressed pressure therein, a second hydrostatic machine which is adjustable in volume and is connected to the supply line, a valve determining the direction of rotation and the speed of the second machine by adjusting a control flow defining a desired speed value, a signal generator coupled to the second machine for generating a control flow defining an actual value of the speed, a pilot controlled valve for comparing the actual value control flow and the desired value control flow and generating a pressure difference therebetween, and an adjusting cylinder controlled by the pressure difference for setting the pivotal angle of the second machine. To increase the load stiffness and stability of the control system a hydraulic compensating volume is connected to either side of the signal generator. The compensating volume may be defined by either a hydraulic accumulator or by a compensating cylinder including a piston. The compensating volume may be provided with a resilient bias force.
REFERENCES:
patent: 2983101 (1961-05-01), Tyler
patent: 4531367 (1985-07-01), Backe et al.
"Regelung eines Verstellmotors an einem Konstant-Drucknetz" by W. Backe, H. Murrenhoff (1981), pp. 635-636, 639-643.
Lopez F. Daniel
Mannesmann-Rexroth GmbH
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