Transmission for an electric drive or drive train of a vehicle, electric drive and drive train

1. An electric drive for a vehicle, comprising:

an electric machine ( 2 );

a transmission ( 1 ) comprising a first input shaft ( 10 ), a second input shaft ( 11 ), an output shaft ( 12 ), at least two shift elements ( 3 , 4 , 6 , 7 ) for selectively connecting the transmission ( 1 ) to the electric machine ( 2 ), and a planetary gear set ( 5 ) configured as a stepped planetary gear set with planetary gears ( 5 . 3 , 5 . 4 ) mounted at a planet carrier ( 5 . 6 ), the planetary gears ( 5 . 3 , 5 . 4 ) having two different sized effective diameters,

wherein a first sun gear ( 5 . 1 ) of the planetary gear set ( 5 ) is meshed with a larger effective diameter ( 5 . 3 ) of the planetary gears,

wherein a second sun gear ( 5 . 2 ) of the planetary gear set ( 5 ) is meshed with a smaller effective diameter ( 5 . 4 ) of the planetary gears,

wherein a ring gear ( 5 . 5 ) of the planetary gear set ( 5 ) is meshed with the larger effective diameter ( 5 . 3 ) of the planetary gears,

wherein the first sun gear ( 5 . 1 ) of the planetary gear set ( 5 ) is rotationally fixed to the first input shaft ( 10 ),

wherein the second sun gear ( 5 . 2 ) of the planetary gear set ( 5 ) is rotationally fixed to the second input shaft ( 11 ),

wherein the ring gear ( 5 . 5 ) of the planetary gear set ( 5 ) is fixed at a rotationally fixed component ( 0 ) of the transmission ( 1 ),

wherein the planet carrier ( 5 . 6 ) of the planetary gear set ( 5 ) is rotationally fixed to the output shaft ( 12 ),

wherein a first shift element ( 3 ) of the at least two shift elements ( 3 , 4 , 6 , 7 ) is configured for selectively connecting the first input shaft ( 10 ) to the electric machine of the electric drive, and

wherein a second shift element ( 4 ) of the at least two shift elements ( 3 , 4 , 6 , 7 ) is configured for selectively connecting the second input shaft ( 11 ) to the electric machine ( 2 ) of the electric drive.

2. The transmission of claim 1 , wherein the first input shaft ( 10 ) is arranged coaxially to the second input shaft ( 11 ).

3. The transmission of claim 2 , wherein the first input shaft ( 10 ) is configured as a hollow shaft, and the second input shaft ( 11 ) is arranged within the first input shaft ( 10 ).

4. The transmission of claim 1 , wherein the output shaft ( 12 ) is arranged coaxially to the first input shaft ( 10 ) and the second input shaft ( 11 ).

5. The transmission of claim 1 , wherein the first shift element ( 3 ) is arranged axially between the second shift element ( 4 ) and the first sun gear ( 5 . 1 ).

6. The transmission of claim 1 , wherein a first gear ratio (E 1 ) results by engaging the first shift element ( 3 ), and a second gear ratio (E 2 ) results by engaging the second shift element ( 4 ).

7. The transmission of claim 1 , wherein the planetary gear set is interlocked by engaging the first shift element and the second shift element.

8. The transmission of claim 1 , wherein a gear step (i) of essentially two exists between a first gear ratio (E 1 ) and a second gear ratio (E 2 ).

9. The transmission of claim 1 , further comprising a third shift element ( 6 ) configured for selectively connecting the output shaft ( 12 ) to the electric machine of the electric drive.

10. The transmission of claim 9 , wherein a third gear ratio (E 3 ) results by engaging the third shift element ( 6 ).

11. The transmission of claim 10 , wherein a gear step (i) of essentially two exists between a second gear ratio (E 2 ) and a third gear ratio (E 3 ).

12. The transmission of claim 1 , wherein at least one of the at least two shift elements ( 3 , 4 , 5 , 7 ) is a multi-disk clutch or a cone clutch.

13. The transmission of claim 1 , wherein at least one of the at least two shift elements ( 3 , 4 , 6 , 7 ) is a dog clutch.

14. An electric drive for a vehicle, comprising:

an electric machine ( 2 );

a transmission ( 1 ) comprising a first input shaft ( 10 ), a second input shaft ( 11 ), an output shaft ( 12 ), at least two shift elements ( 3 , 4 , 6 , 7 ) for selectively connecting the transmission ( 1 ) to the electric machine ( 2 ), and a planetary gear set ( 5 ) configured as a stepped planetary gear set with planetary gears ( 5 . 3 , 5 . 4 ) mounted at a planet carrier ( 5 . 6 ), the planetary gears ( 5 . 3 , 5 . 4 ) having two different sized effective diameters,

wherein a first sun gear ( 5 . 1 ) of the planetary gear set ( 5 ) is meshed with a larger effective diameter ( 5 . 3 ) of the planetary gears,

wherein a second sun gear ( 5 . 2 ) of the planetary gear set ( 5 ) is meshed with a smaller effective diameter ( 5 . 4 ) of the planetary gears,

wherein a ring gear ( 5 . 5 ) of the planetary gear set ( 5 ) is meshed with the larger effective diameter ( 5 . 3 ) of the planetary gears,

wherein the first sun gear ( 5 . 1 ) of the planetary gear set ( 5 ) is rotationally fixed to the first input shaft ( 10 ),

wherein the second sun gear ( 5 . 2 ) of the planetary gear set ( 5 ) is rotationally fixed to the second input shaft ( 11 ),

wherein the planet carrier ( 5 . 6 ) of the planetary gear set ( 5 ) is rotationally fixed to the output shaft ( 12 ),

wherein a first shift element ( 3 ) of the at least two shift elements ( 3 , 4 , 6 , 7 ) is configured for selectively connecting the first input shaft ( 10 ) to the electric machine of the electric drive, and

wherein a second shift element ( 4 ) of the at least two shift elements ( 3 , 4 , 6 , 7 ) is configured for selectively connecting the second input shaft ( 11 ) to the electric machine ( 2 ) of the electric drive, and

the ring gear ( 5 . 5 ) of the planetary gear set ( 5 ) is selectively fixable at a rotationally fixed component ( 0 ) of the transmission ( 1 ) by a fourth shift element ( 7 ) of the at least two shift elements ( 3 , 4 , 6 , 7 ).

15. The transmission of claim 14 , wherein one or more of:

a first gear ratio (E 1 ) results by engaging the first shift element ( 3 ) and the fourth shift element ( 7 );

a second gear ratio (E 2 ) results by engaging the second shift element ( 4 ) and the fourth shift element ( 7 ); and

a third gear ratio (E 3 ) results by engaging the first shift element ( 3 ) and the second shift element ( 4 ).

16. An electric drive for a vehicle, comprising:

an electric machine ( 2 ); and

a transmission ( 1 ) comprising a first input shaft ( 10 ), a second input shaft ( 11 ), an output shaft ( 12 ), at least two shift elements ( 3 , 4 , 6 , 7 ) for selectively connecting the transmission ( 1 ) to the electric machine ( 2 ), and a first planetary gear set ( 5 ) configured as a stepped planetary gear set with planetary gears ( 5 . 3 , 5 . 4 ) mounted at a planet carrier ( 5 . 6 ), the planetary gears ( 5 . 3 , 5 . 4 ) having two different sized effective diameters,

wherein a first sun gear ( 5 . 1 ) of the first planetary gear set ( 5 ) is meshed with a larger effective diameter ( 5 . 3 ) of the planetary gears,

wherein a second sun gear ( 5 . 2 ) of the first planetary gear set ( 5 ) is meshed with a smaller effective diameter ( 5 . 4 ) of the planetary gears,

wherein a ring gear ( 5 . 5 ) of the first planetary gear set ( 5 ) is meshed with the larger effective diameter ( 5 . 3 ) of the planetary gears,

wherein the first sun gear ( 5 . 1 ) of the first planetary gear set ( 5 ) is rotationally fixed to the first input shaft ( 10 ),

wherein the second sun gear ( 5 . 2 ) of the first planetary gear set ( 5 ) is rotationally fixed to the second input shaft ( 11 ),

wherein the ring gear ( 5 . 5 ) of the first planetary gear set ( 5 ) is fixed at a rotationally fixed component ( 0 ) of the transmission ( 1 ),

wherein the planet carrier ( 5 . 6 ) of the first planetary gear set ( 5 ) is rotationally fixed to the output shaft ( 12 ),

wherein a first shift element ( 3 ) of the at least two shift elements ( 3 , 4 , 6 , 7 ) is configured for selectively connecting the first input shaft ( 10 ) to the electric machine of the electric drive,

wherein a second shift element ( 4 ) of the at least two shift elements ( 3 , 4 , 6 , 7 ) is configured for selectively connecting the second input shaft ( 11 ) to the electric machine ( 2 ) of the electric drive, and

wherein the electric machine ( 2 ) is connectable to the transmission ( 1 ) via the at least two shift elements ( 3 , 4 , 6 , 7 ) in order to form gear steps.

17. A drive train ( 100 ) for a vehicle, comprising:

the electric drive of claim 16 ; and

a differential connected to the output shaft ( 12 ) of the first planetary gear set ( 5 ).

18. The drive train of claim 17 , wherein the differential comprises a bevel gear differential ( 9 ) and a transmission gearing, and the transmission gearing is formed by a spur gear stage ( 14 ) or by a second planetary gear set ( 8 ).

19. The drive train of claim 17 , wherein the differential comprises a second planetary gear set ( 8 ) and a third planetary gear set ( 13 ).

20. The drive train of claim 17 , wherein the differential comprises a bevel gear differential ( 9 ) and a transmission gearing, and the transmission gearing is formed by a second planetary gear set ( 8 ) and the bevel gear differential is arranged radially within a rotor ( 2 . 1 ) of the electric machine ( 2 ).