Arrangement for controlling the operation of a fluid-displacemen

Details Arrangement for controlling the operation of a fluid-displacemen Arrangement for controlling the operation of a fluid-displacemen

1978-05-19

1980-03-25

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60494, 417212, F16H 3946

Patent

active

041943643

ABSTRACT:
An arrangement for controlling the operation of a fluid-displacement machine, such as a hydraulic pump or motor, which is equipped with an adjuster that adjusts the machine toward higher and lower throughputs in dependence upon the pressure of a control fluid acting thereon, includes a control valve which communicates the adjuster either with a high-pressure zone or with a low-pressure zone of a control circuit in different ones of its terminal positions. In addition thereto, the arrangement includes a pressure-limiting valve interposed between the low-pressure and the high-pressure zones of the control circuit. Both the control and pressure limiting valves are acted upon by the control fluid, the pressure of which is controlled by a common regulating valve. The control and pressure-limiting valve as well as the associated equipment are so constructed that the magnitude of the force required to move the limiting valve toward the open position exceeds that of the force required to move the control valve toward that position in which the adjuster adjusts the machine toward lower throughputs.

REFERENCES:
patent: 3856436 (1974-12-01), Lonnemo
patent: 3959969 (1976-06-01), Tittmann et al.
patent: 3990237 (1976-11-01), Van Gerpen
patent: 3995425 (1976-12-01), Wittren

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