DRIVE DEVICE FOR A MOTOR VEHICLE

Abstract

A drive device for a motor vehicle, having at least one drive unit and one coolant circuit for controlling the temperature of the at least one drive unit, in which at least one coolant pump is arranged in the coolant circuit for circulating an aqueous coolant in the coolant circuit. It is provided in this case that the coolant pump is designed as a screw spindle pump.

Claims

1-10. (canceled)

11. A drive device for a motor vehicle, comprising at least one drive unit and one coolant circuit for controlling the temperature of the at least one drive unit, wherein at least one coolant pump is arranged in the coolant circuit for circulating an aqueous coolant in the coolant circuit, wherein the coolant pump is designed as a screw spindle pump and has a drive screw coupled to a drive and at least one idle screw which interacts with the drive screw for circulating the coolant, wherein at least one or precisely one of the following screws has a coating: drive screw and idle screw, wherein the a main body of the screw consists of plastic or has plastic, and in that the coating is designed such that it is transferred from the screw having the coating to the other screw during operation of the coolant pump.

12. The drive device according to claim 11, wherein the drive unit has at least one of the following devices or is formed as such: internal combustion engine, electric motor, and fuel cells.

13. The drive device according to claim 11, wherein the coolant pump has an output pressure of maximum 10 bar, maximum 7.5 bar, or maximum 5 bar.

14. The drive device according to claim 11, wherein the coating is placed on the main body of the screw, and in that the screw is formed with transition fit or gap fit to a housing of the coolant pump, in which the screw is rotatably mounted.

15. The drive device according to claim 11, wherein the coating consists of carbon or has carbon.

16. The drive device according to claim 11, wherein the coolant predominately contains water.

17. The drive device according to claim 11, wherein at least one additive, particularly glycol, is mixed in with the water.

18. The drive device according to claim 12, wherein the coolant pump has an output pressure of maximum 10 bar, maximum 7.5 bar, or maximum 5 bar.

19. The drive device according to claim 12, wherein the coating is placed on the main body of the screw, and in that the screw is formed with transition fit or gap fit to a housing of the coolant pump, in which the screw is rotatably mounted.

20. The drive device according to claim 13, wherein the coating is placed on the main body of the screw, and in that the screw is formed with transition fit or gap fit to a housing of the coolant pump, in which the screw is rotatably mounted.

21. The drive device according to claim 12, wherein the coating consists of carbon or has carbon.

22. The drive device according to claim 13, wherein the coating consists of carbon or has carbon.

23. The drive device according to claim 14, wherein the coating consists of carbon or has carbon.

24. The drive device according to claim 12, wherein the coolant predominately contains water.

25. The drive device according to claim 13, wherein the coolant predominately contains water.

26. The drive device according to claim 14, wherein the coolant predominately contains water.

27. The drive device according to claim 15, wherein the coolant predominately contains water.

28. The drive device according to claim 12, wherein at least one additive, particularly glycol, is mixed in with the water.

29. The drive device according to claim 13, wherein at least one additive, particularly glycol, is mixed in with the water.

30. The drive device according to claim 14, wherein at least one additive, particularly glycol, is mixed in with the water.

Description

[0026] The invention is explained in more detail in the following by means of exemplary embodiments shown in the drawing, without limiting the invention. In doing so, the only figure shows a schematic representation of a drive device for a motor vehicle.

[0027] The figure shows a schematic representation of a drive device 1 for a motor vehicle. The drive device 1 has a drive unit 2, to which a coolant circuit 3 is assigned for the temperature control of the drive unit. The coolant circuit 3 has a radiator 4, i.e. ultimately a heat exchanger, as well as a coolant pump 5 for circulating an aqueous coolant in the coolant circuit 3.

[0028] It can be seen that the coolant pump 5 is designed as a screw spindle pump within the scope of the drive devices 1 shown herein. Such a pump has numerous advantages over other types of pumps; particularly, it functions according to the displacement principle such that a high level of dynamics of the coolant circuit 3 can be realized. In addition, it has a very high degree of efficiency and extremely good acoustic characteristics. These advantages can surprisingly also be implemented within the scope of the coolant circuit 3 presented herein. Screw spindle pumps have not previously been used for such coolant circuits 3.

LIST OF REFERENCE NUMERALS

[0029] 1 Drive device

[0030] 2 Drive unit

[0031] 3 Coolant circuit

[0032] 4 Radiator

[0033] 5 Coolant pump