Control arrangement for at least two hydraulic consumers fed by at least one pump
AssigneeMannesmann Rexroth GmbH
InventorsNorbert Kreth, Martin Schmitt, Armin Stellwagen
Life of this patent
Estimating the term…
Abstract
A pump supplies via in each case a directional valve a plurality of consumers with fluid, a pressure balance for load-independent division of the pump displacement being provided between each branch line branching off the pump delivery line and the directional valve. In a pressure regulating valve common to all pressure balances a control pressure is generated from the pressure difference between the pump pressure and the respective highest consumer pressure and is applied to all the pressure balances so that when the pump power is inadequate a proportional quantity reduction at all consumers is achieved.
Claims14
Control arrangement for a system having at least two hydraulic consumers, at least one pump, respective direction and speed controlling valve means associated between said pump and each consumer, and a respective pressure balance for setting a load-independent flow to said directional and speed controlling valve means, said pressure balance being subjected to a first pressure difference between the input and the output of the associated directional valve when the pump displacement is adequate and to a second lower pressure difference for reducing the flow when the pump displacement is inadequate, characterized in that the second pressure difference is generated by a pressure regulating valve controlled by the pump pressure and highest consumer pressure and provides a control pressure output led jointly to all said pressure balances.
Dependencies are inferred from the claim text.