Hydraulic control arrangement for servomotors

摘要

The subject matter of the invention is a hydraulic two-stage control arrangement for servomotors which is intended in particular for the steering control of vehicles and heavy machines. A volume-metering unit (3) belonging to the first control stage and a flow booster of the second stage are given priority over further consumers when fed by at least one pump (29) by means of a flow divider (10). At least one further pump (30) is connected to the feed passage (18) of the control arrangement (11) in the flow direction downstream of the flow divider (10), and circulation which can be varied at short notice is formed between the feed passage (18) and the discharge passage (21): a) by circulation profiles of the flow booster, b) by pressure-controlled overflow valve, c) by circulation profiles of the flow divider. <IMAGE>