Hydraulic gearbox actuator and assembly with such a gearbox actuator and a gearbox for a drive train of a motor vehicle

1. A hydraulic gearbox actuator comprising a hydraulic pump which has a pump body wherein a rotor is arranged, wherein a drive motor is provided with which the rotor can be driven in opposite directions, wherein two working chambers which are separated from each other are formed in the pump body, said working chambers each having two openings, of which at least three openings are connected to a respective pressure supply circuit, the one side of which is connected to a reservoir and the other side of the respective pressure supply circuit is connected to one of three pressure outlets of the gearbox actuator.

2. The hydraulic gearbox actuator according to claim 1 , wherein the fourth opening is directly connected to the reservoir.

3. The hydraulic gearbox actuator according to claim 1 , wherein all of the openings are connected to the respective pressure supply circuit, the one side of which is connected to the reservoir and the other side of which is connected to one of four pressure outlets of the gearbox actuator.

4. The hydraulic gearbox actuator according to claim 1 , wherein a proportional valve is arranged in each pressure supply circuit between the opening and the pressure outlet.

5. The hydraulic gearbox actuator according to claim 4 , wherein the reservoir is divided into separate chambers, and each proportional valve has a return line which leads to the chamber of the reservoir from which the pressure supply circuit which is connected to the same working chamber of the hydraulic pump draws.

6. The hydraulic gearbox actuator according to claim 1 , wherein a nonreturn valve is provided in each pressure supply circuit, said nonreturn valve being arranged between an intake from the reservoir and a respective branch to the opening of the hydraulic pump.

7. The hydraulic gearbox actuator according to claim 1 , wherein the hydraulic pump is a roller cell pump or a vane pump.

8. An assembly with a hydraulic gearbox actuator according to claim 1 and a gearbox for a drive train of a motor vehicle, wherein the gearbox has at least one clutch and at least one brake, and the gearbox actuator can actuate the at least one clutch and the at least one brake.

9. The assembly according to claim 8 , wherein two of the pressure outlets are connected to a respective clutch of the gearbox, and two of the pressure outlets are connected to a respective brake of the gearbox.

10. The assembly according to claim 9 , wherein the brakes are each assigned to a respective planetary gear set and the clutches are assigned to an internal combustion engine and/or to an electric motor.