Drive unit for an electric vehicle, and motor vehicle

Abstract

A drive unit for an electric vehicle includes a first electrical drive assembly which is associated with, and drive-connected to, a motor vehicle front axle, and a second electrical drive assembly which is associated with, and drive-connected to, a motor vehicle rear axle. A center of mass of the first drive assembly lies on a side of the motor vehicle front axle facing away from the motor vehicle rear axle, and a center of mass of the second drive assembly lies on a side of the motor vehicle rear axle facing away from the motor vehicle front axle. Also, a motor vehicle has such a drive unit.

Claims

1. A drive unit for an electric vehicle, comprising: a first electrical drive assembly, which is associated with, and drive-connected to, a motor vehicle front axle; a second electrical drive assembly, which is associated with, and drive-connected to, a motor vehicle rear axle; and an electrical energy accumulator which is held in the electric vehicle by a support frame, the support frame surrounding the electrical energy accumulator on four sides thereof and forming a side edge of the motor vehicle; wherein a center of mass of the first drive assembly lies on a side of the motor vehicle front axle facing away from the motor vehicle rear axle, and a center of mass of the second drive assembly lies on a side of the motor vehicle rear axle facing away from the motor vehicle front axle.

2. The drive unit according to claim 1, wherein each of the first and second drive assemblies comprises an electric machine and a gear unit.

3. The drive unit according to claim 2, wherein the electric machine of the first drive assembly is drive-coupled to the motor vehicle front axle across the gear unit of the first drive assembly and/or the electric machine of the second drive assembly is drive-coupled to the motor vehicle rear axle across the gear unit of the second drive assembly.

4. The drive unit according to claim 2, wherein the electric machine of the first drive assembly and/or the electric machine of the second drive assembly is a permanent magnet-excited synchronous machine, a current-excited synchronous machine, or an induction machine.

5. The drive unit according to claim 1, wherein the first and second drive assemblies comprise a respective inverter unit.

6. The drive unit according to claim 1, wherein the first drive assembly and the second drive assembly are drive-decoupled.

7. The drive unit according to claim 1, wherein the first drive assembly and the second drive assembly are torque-adjustable independently of each other.

8. The drive unit according to claim 1, further comprising an electrical energy accumulator, which is arranged between the motor vehicle front axle and the motor vehicle rear axle.

9. The drive unit according to claim 1, wherein the support frame is formed at least for a portion by chassis components.

10. The drive unit according to claim 3, wherein the electric machine of the first drive assembly and/or the electric machine of the second drive assembly is a permanent magnet-excited synchronous machine, a current-excited synchronous machine, or an induction machine.

11. The drive unit according to claim 2, wherein the first and second drive assemblies comprise a respective inverter unit.

12. The drive unit according to claim 2, wherein the first drive assembly and the second drive assembly are drive-decoupled.

13. The drive unit according to claim 3, wherein the first drive assembly and the second drive assembly are drive-decoupled.

14. The drive unit according to claim 2, wherein the first drive assembly and the second drive assembly are torque-adjustable independently of each other.

15. The drive unit according to claim 3, wherein the first drive assembly and the second drive assembly are torque-adjustable independently of each other.

16. The drive unit according to claim 2, further comprising an electrical energy accumulator, which is arranged between the motor vehicle front axle and the motor vehicle rear axle.

17. The drive unit according to claim 3, further comprising an electrical energy accumulator, which is arranged between the motor vehicle front axle and the motor vehicle rear axle.

18. The drive unit according to claim 2, further comprising an electrical energy accumulator which is held in the electric vehicle by a support frame, the support frame forming a side edge of the motor vehicle.

19. A motor vehicle having a drive unit according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1 illustrates a motor vehicle according to the invention with a drive unit according to the invention.

DETAILED DESCRIPTION OF THE DRAWING

(2) The single FIGURE shows a motor vehicle 10 which in the embodiment depicted is a pure electric vehicle.

(3) The motor vehicle 10 comprises a drive unit 12 having a first electrical drive assembly 14 and a second electrical drive assembly 16.

(4) The first electrical drive assembly 14 is associated with a motor vehicle front axle 17 and comprises an electric machine 18, a gear unit 20 and an inverter unit 22.

(5) A center of mass 24 of the first electrical drive assembly 14 lies on a side of the motor vehicle front axle 17 facing away from the motor vehicle rear axle 26.

(6) The second electrical drive assembly 16 is associated with a motor vehicle rear axle 26. This comprises an electric machine 28, a gear unit 30 and an inverter unit 32.

(7) A center of mass 34 of the second drive assembly 16 lies on a side of the motor vehicle rear axle 26 facing away from the motor vehicle front axle 17.

(8) In other words, the center of mass 34 of the second electrical drive assembly 16 lies behind the motor vehicle rear axle 26 and the center of mass 24 of the first electrical drive assembly 14 lies in front of the motor vehicle front axle 17.

(9) The first electrical drive assembly 14 is drive-connected to the motor vehicle front axle 17 and the second electrical drive assembly 16 is drive-connected to the motor vehicle rear axle 26.

(10) For this, the electric machine 18 is drive-coupled to the motor vehicle front axle 17 across the gear unit 20 and the electric machine 28 is drive-coupled to the motor vehicle rear axle 26 across the gear unit 30.

(11) Thus, the first electrical drive assembly 14 is not coupled to the second electrical drive assembly 16. The drive assemblies 14, 16 are thus drive-decoupled.

(12) The two drive assemblies 14, 16 are torque-adjustable independently of each other.

(13) The electric machines 18, 28 may be permanent magnet-excited synchronous machines, current-excited synchronous machines or induction machines. A combination of the mentioned types is also possible, so that, for example, the electric machine 18 is a permanent magnet-excited synchronous machine and the electric machine 28 is a current-excited synchronous machine.

(14) The drive unit 12 furthermore comprises an electrical energy accumulator 36, which is arranged between the motor vehicle front axle 17 and the motor vehicle rear axle 26.

(15) The energy accumulator 36 works together with both the electric machine 18 and the electric machine 28.

(16) If the electric machines 18, 28 are operating as electric motors, the energy accumulator 36 provides a direct current, which is converted by the inverter units 22, 32 into a three-phase alternating current. This is used to supply the electric machines 18, 28 and drive the motor vehicle front axle 17 and the motor vehicle rear axle 26.

(17) In a generator mode, the electric machines 18, 28 work as generators. This may occur, for example, in the course of a recuperation during the braking of the motor vehicle 10.

(18) The electric machines 18, 28 then provide a 3-phase alternating current, which is converted by the associated inverter units 22, 32 into a direct current. This direct current can charge the energy accumulator 36.

(19) From a mechanical perspective, the energy accumulator 36 is held in the motor vehicle 10 by means of a support frame 38.

(20) The support frame 38 is basically a side edge 39a, 39b of the motor vehicle.

(21) Furthermore, the support frame 38 is formed at least for a portion by chassis components. In the embodiment shown, for example, the frame components 40, 42 are longitudinal beams of the chassis.

(22) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.