Constant speed control for positive displacement variable stroke

Details Constant speed control for positive displacement variable stroke Constant speed control for positive displacement variable stroke

1983-03-24

1987-07-21

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60448, 91506, F16D 3102

Patent

active

046809317

ABSTRACT:
In a positive displacement variable stroke motor, a constant speed variable power drive governor is disclosed which varies stroke instead of driving pressure and hence conserves power through reducing throttling losses. Typically, the control is used on at least one of a plurality of motors all driven from the high pressure manifold of a pressure compensated controlled pump driven by a prime mover. The particular controlled positive displacement variable stroke motor is connected at fluid intake to the high pressure manifold on the high pressure fluid side and discharges to a reservoir on the low pressure fluid side. The controlled motor also drives a small positive displacement pump--typically an in situ charge pump--and produces a discharge through a square edge orifice in an insolated hydraulic control circuit. In response to load changes, a hydraulic amplifier monitors the pressure in the hydraulic control circuit and changes the motor stroke, typically by changing tilt box angle. With decreasing hydraulic control circuit pressure responsive to increasing load, pump stroke is increased. With increasing hydraulic control circuit pressure responsive to decreasing controlled pump load, pump stroke is decreased. In either case, when the pump stroke reaches its new setting, the small positive displacement pump returns the pressure in its isolated circuit substantially back to the original pressure. A number of exemplary circuits are illustrated including various types of hydraulic amplifiers, dual motor controls, controls for use with reversible motors and an embodiment including a throttle valve in series with the controlled motor.

REFERENCES:
patent: 3054263 (1962-09-01), Budzich et al.
patent: 3521852 (1970-07-01), Gillis
patent: 3986357 (1976-10-01), Hoffman
patent: 4102607 (1978-07-01), Benson
patent: 4168612 (1979-09-01), Nikolaus

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