| 摘要 |
<p>Disclosed is a hydraulic system for utility vehicles, in particular agricultural tractors, for supplying primary and/or auxiliary pressure medium consumers (6, 11, 12) with pressure medium, comprising a pump (1), sucking from a pressure medium tank (3), the pump being controlled as a function of the load pressure of the pressure medium consumers and supplying a pump pressure exceeding the load pressure by a predetermined control pressure differential. In order to produce a first control pressure differential for operating a primary pressure medium consumer (6) its load pressure acts upon a pressure and flow controller (13) of the pump and in order to produce a second higher control pressure differential for operating an auxiliary pressure medium consumer (11, 12) a pressure exceeding their load pressure is produced by means of an amplifying circuit (29). In order to obtain rapid response of an actuated primary pressure medium consumer and in order to prevent, under certain conditions due to thermal expansion, pressure medium from flowing to the pressure and flow controller of the pump and possibly causing unwanted restriction of the pump, it is proposed that the load pressure of a primary pressure medium consumer (6) and the pressure supplied by the amplifying circuit (29) can be fed via a shuttle valve (19) to the pressure and flow controller (13) of the pump (1) and that the load pressure reporting line (28) conducting the load pressure of an auxiliary pressure medium consumer (11, 12) is connected via a flow control valve (30) to the pressure medium tank (3).</p> |
