Hydraulic assembly and commercial vehicle
A hydraulic assembly for a commercial vehicle includes a supply connector which is hydraulically connected or connectable to a pump outlet of a hydraulic variable pump and a feedback connector. The hydraulic assembly includes an adjustment control, which depends on an outlet pressure of the variable pump and on a reported pressure of the feedback connector, for adjusting the variable pump. A hydraulic valve device is disposed in the flow path between the feedback connector and the adjustment control. The valve device includes a valve unit which is effective as a hydraulic connection or interruption in the flow path, depending on a shift position. Moreover, the disclosure relates to a commercial vehicle having such a hydraulic assembly.
1 . A hydraulic assembly for a commercial vehicle, comprising:
a supply connector, which is hydraulically connected or connectable to a pump outlet of a hydraulic variable pump, as an interface for supplying hydraulic consumers of the commercial vehicle;
a feedback connector as an interface for pressure feedback from consumers;
an adjustment control, which depends on an outlet pressure of the variable pump and on a reported pressure of the feedback connector, for adjusting the variable pump;
a hydraulic valve device in the flow path between the feedback connector and the adjustment control, the valve device including a valve unit having a first shift position which is effective as a hydraulic connection in the flow path and a second shift position which is effective as a hydraulic interruption in the flow path; and
a second hydraulic valve device in the flow path between the pump outlet and the supply connector, wherein the second valve device includes at least one of a second valve unit having a first shift position which is effective as a hydraulic connection in the flow path and a second shift position which is effective as a hydraulic interruption in the flow path, and wherein in the second shift position of the second valve unit disposed in the flow path between the pump outlet of the variable pump and the supply connector the pump outlet is hydraulically connectable or hydraulically connected to a tank connector.
2 . The hydraulic assembly of claim 1 , wherein the valve unit disposed in the flow path between the feedback connector and the adjustment control has a single valve connector at least on the connection side that faces the adjustment control.
3 . The hydraulic assembly of claim 1 , wherein the valve unit has two valve connectors on the connection side that faces away from the adjustment control such that in the second shift position the adjustment control is hydraulically connected to a tank connector.
4 . The hydraulic assembly of claim 1 , wherein the second valve device includes a third valve unit hydraulically connected to the flow path as a branch to a tank connector and having a first shift position which is effective as a hydraulic interruption to the tank connector and a second shift position which is effective as a hydraulic connection to the tank connector.
5 . The hydraulic assembly of claim 1 , wherein the pump outlet is hydraulically connectable to the tank connector depending on reaching or exceeding a predetermined nominal pressure at the pump outlet.
6 . The hydraulic assembly of claim 1 , wherein the second valve unit disposed in the flow path between the pump outlet of the variable pump and the supply connector has a single valve connector at least on the connection side that faces the pump outlet.
7 . The hydraulic assembly of claim 1 , wherein the second valve unit disposed in the flow path between the pump outlet of the variable pump and the supply connector has two valve connectors on the connection side that faces away from the pump outlet.
8 . A commercial vehicle comprising:
a drive motor;
a hydraulic assembly including:
a supply connector, which is hydraulically connected or connectable to a pump outlet of a hydraulic variable pump, as an interface for supplying hydraulic consumers of the commercial vehicle;
a feedback connector as an interface for pressure feedback from consumers;
an adjustment control, which depends on an outlet pressure of the variable pump and on a reported pressure of the feedback connector, for adjusting the variable pump;
a hydraulic valve device in the flow path between the feedback connector and the adjustment control, the valve device including a valve unit having a first shift position which is effective as a hydraulic connection in the flow path and a second shift position which is effective as a hydraulic interruption in the flow path; and
a second hydraulic valve device in the flow path between the pump outlet and the supply connector, wherein the second valve device includes a second valve unit having a first shift position which is effective as a hydraulic connection in the flow path and a second shift position which is effective as a hydraulic interruption in the flow path, and wherein the second valve unit disposed in the flow path between the pump outlet of the variable pump and the supply connector has two valve connectors on the connection side that faces away from the pump outlet.
9 . The commercial vehicle of claim 8 , wherein the drive motor is operatively connected to the variable pump.
10 . The commercial vehicle of claim 8 , wherein the valve unit, immediately prior to start-up or during start-up of the drive motor, is in its second shift position.
11 . A hydraulic assembly for a commercial vehicle, comprising:
a supply connector, which is hydraulically connected or connectable to a pump outlet of a hydraulic variable pump, as an interface for supplying hydraulic consumers of the commercial vehicle;
a feedback connector as an interface for pressure feedback from consumers;
an adjustment control, which depends on an outlet pressure of the variable pump and on a reported pressure of the feedback connector, for adjusting the variable pump;
a hydraulic valve device in the flow path between the feedback connector and the adjustment control, the valve device including a valve unit having a first shift position which is effective as a hydraulic connection in the flow path and a second shift position which is effective as a hydraulic interruption in the flow path; and
a second hydraulic valve device in the flow path between the pump outlet and the supply connector, wherein the second valve device includes a third valve unit hydraulically connected to the flow path as a branch to a tank connector and having a first shift position which is effective as a hydraulic interruption to the tank connector and a second shift position which is effective as a hydraulic connection to the tank connector.
12 . The hydraulic assembly of claim 11 , wherein the third valve unit branching off from the flow path is designed as a 2/2-way valve.
13 . The hydraulic assembly of claim 11 , wherein the third valve unit branching off from the flow path assumes its second shift position effective as a hydraulic connection to the tank connector depending on reaching or exceeding a predetermined nominal pressure at the pump outlet.
14 . The hydraulic assembly of claim 13 , wherein the nominal pressure is variably adjustable at the third valve unit.
15 . The commercial vehicle of claim 11 , wherein the second valve device includes a second valve unit having a first shift position which is effective as a hydraulic connection in the flow path and a second shift position which is effective as a hydraulic interruption in the flow path.