Hydraulic controller arrangement
AssigneeBosch Rexroth AG
InventorArmin Stellwagen
Life of this patent
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Abstract
What is disclosed is a hydraulic controller arrangement for the pressure medium supply of a hydraulic consumer, e.g., of the rotating gear of a mobile work machine. At low pressure medium flow rates, the pressure medium flow rate draining from the consumer is backed up by means of a drain backup valve having the form of a pressure limiting valve and throttled accordingly, so that a back pressure is generated which is capable of preventing an advance of the mass actuated by the hydraulic consumer.
Claims9
A hydraulic controller arrangement for pressure medium supply of a hydraulic consumer whereby a load having a high mass may be moved, the hydraulic controller arrangement comprising:
- a pump which may be controlled dependent upon a load pressure at the consumer;
- a proportionally adjustable directional control valve, wherein the pressure medium may be conducted via the proportionally adjustable directional control valve to the consumer and from the consumer to a tank passage via a drain cross-section controlled to be opened by a drain control edge of the directional control valve;
- a pressure limiting valve disposed in a pressure medium flow path between the consumer and the tank passage, the pressure limiting valve being subjected in its opening direction to pressure in a pressure medium return, whereby it is possible to open a drain branch line leading to the tank passage substantially prior to opening of the drain cross-section.
Dependencies are inferred from the claim text.