Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1990-05-04
1992-01-07
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60445, 60446, 60449, F16D 3102
Patent
active
050779753
ABSTRACT:
Disclosed is a preferably electrohydraulic control for a load-dependently operating variable displacement pump, which is equipped with a differential pressure control device for ensuring a predetermined pressure drop at the control edge of a directional valve integrated into the consumer supply line. The differential pressure control device has a servo valve, the valve spool of which can be brought out of a first position, increasing the output volume of the variable displacement pump, against the compressive force of a spring and of a control pressure led off from the supply pressure upstream of the directional valve, by the pump pressure into a second position, reducing the output volume. In order to be able to adapt the volume flow control to the different requirements of various consumers, in particular of a mobile piece of equipment, such as for example a farming tractor, and thereby improve the quality of the control, the control pressure effective at the servo valve is arbitrarily influenced by means of a separately controllable actuating device, preferably designed as a servo valve.
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Backe, W.: Neue Moglichkeiten der Verdrangerregelung, o+u Olhydraulik und Pneumatik 32, 1988, Nr. 11, pp. 778-783.
Look Edward K.
Mannesmann Rexroth GmbH
Mattingly Todd
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