GEARBOX UNIT FOR A MOTOR VEHICLE

Abstract

A gearbox unit for a motor vehicle, wherein the motor vehicle has a first wheel axle and a second wheel axle, with the second wheel axle being composed of at least one first sub-axle and one second sub-axle. Provided here are a first connecting shaft, which is operatively connectible to the first sub-axle, a second connecting shaft, which is operatively connectible to the second sub-axle, as well as a coupling gearbox with a drive input shaft, which is operatively connectible to a drive assembly of the motor vehicle, and with a drive output shaft, which is operatively connectible to the first wheel axle, wherein, by way of the coupling gearbox, the drive input shaft is operatively connected to the first connecting shaft and the second connecting shaft in a torque-splitting manner.

Claims

1-10. (canceled)

11. A gearbox unit for a motor vehicle, wherein the motor vehicle has a first wheel axle and a second wheel axle, with the second wheel axle being composed at least one first sub-axle and one second sub-axle, hereby characterized by a first connecting shaft, which is operatively connectible to the first sub-axle, by a second connecting shaft, which is operatively connectible to the second sub-axle, as well as by a coupling gearbox with a drive input shaft, which is operatively connectible to a drive assembly of the motor vehicle, and with a drive output shaft, which is operatively connectible to the first wheel axle, wherein, by way of the coupling gearbox, the drive input shaft is operatively connected to the first connecting shaft and the second connecting shaft in a torque-splitting manner, and wherein the drive output shaft is operatively connectible to the drive input shaft by means of a first coupling and by means of a second coupling such that each can shift separately, wherein, in the operative connection between the first coupling and the drive input shaft, a first overlay gearing is provided and, in the operative connection between the second coupling and the drive input shaft, a second overlay gearing is provided.

12. The gearbox unit according to claim 11, wherein in that the first overlay gearing and the second overlay gearing are designed as planetary gearings, which are operatively connected directly to the coupling gearbox in each case.

13. The gearbox unit according to claim 11, wherein in that the drive output shaft is operatively connectible to the first overlay gearing by way of the first coupling and to the second overlay gearing by way of the second coupling.

14. The gearbox unit according to claim 11, wherein in that the coupling gearbox has a coupling gearbox sun gear, a coupling gearbox ring gear, and a coupling gearbox planetary carrier with at least one coupling gearbox planetary gear that meshes with the coupling gearbox sun gear and the coupling gearbox ring gear, wherein the coupling gearbox ring gear is directly operatively connected to the drive input shaft.

15. The gearbox unit according to claim 11, wherein in that the coupling gearbox planetary carrier is directly operatively connected to the second connecting shaft and the coupling gearbox sun gear is directly operatively connected to the first connecting shaft.

16. The gearbox unit according to claim 11, wherein in that the coupling gearbox planetary carrier has at least the coupling gearbox planetary gear, which is designed as an outer planetary gear, and at least one inner planetary gear, which mesh with each other, wherein the outer planetary gear meshes with the coupling gearbox ring gear and the inner planetary gear meshes with the coupling gearbox sun gear.

17. The gearbox unit according to claim 11, wherein in that the first overlay gearing has a first overlay gearing sun gear, a first overlay gearing ring gear, and a first overlay gearing planetary carrier with at least one first overlay gearing planetary gear that meshes with the first overlay gearing sun gear and the first overlay gearing ring gear, wherein the first overlay gearing ring gear is operatively connectible directly to the drive output shaft by way of the first coupling.

18. The gearbox unit according to claim 11, wherein in that the second overlay gearing has a second overlay gearing sun gear, a second overlay gearing ring gear, and a second overlay gearing planetary carrier with at least one second overlay gearing planetary gear that meshes with the second overlay gearing sun gear and the second overlay gearing ring gear, wherein the second overlay gearing planetary carrier is operatively connectible directly to the drive output shaft by way of the second coupling.

19. The gearbox unit according to claim 11, wherein in that the second overlay gearing sun gear is directly operatively connected to the drive input shaft, in particular by way of the first overlay gearing planetary carrier, and/or the first overlay gearing planetary carrier is directly operatively connected to the drive input shaft and the coupling gearbox ring gear.

20. The gearbox unit according to claim 11, wherein in that the first overlay gearing sun gear and the second overlay gearing ring gear are operatively connected directly to the first connecting shaft or to the second connecting shaft.

21. The gearbox unit according to claim 12, wherein in that the drive output shaft is operatively connectible to the first overlay gearing by way of the first coupling and to the second overlay gearing by way of the second coupling.

22. The gearbox unit according to claim 12, wherein in that the coupling gearbox has a coupling gearbox sun gear, a coupling gearbox ring gear, and a coupling gearbox planetary carrier with at least one coupling gearbox planetary gear that meshes with the coupling gearbox sun gear and the coupling gearbox ring gear, wherein the coupling gearbox ring gear is directly operatively connected to the drive input shaft.

23. The gearbox unit according to claim 13, wherein in that the coupling gearbox has a coupling gearbox sun gear, a coupling gearbox ring gear, and a coupling gearbox planetary carrier with at least one coupling gearbox planetary gear that meshes with the coupling gearbox sun gear and the coupling gearbox ring gear, wherein the coupling gearbox ring gear is directly operatively connected to the drive input shaft.

24. The gearbox unit according to claim 12, wherein in that the coupling gearbox planetary carrier is directly operatively connected to the second connecting shaft and the coupling gearbox sun gear is directly operatively connected to the first connecting shaft.

25. The gearbox unit according to claim 13, wherein in that the coupling gearbox planetary carrier is directly operatively connected to the second connecting shaft and the coupling gearbox sun gear is directly operatively connected to the first connecting shaft.

26. The gearbox unit according to claim 14, wherein in that the coupling gearbox planetary carrier is directly operatively connected to the second connecting shaft and the coupling gearbox sun gear is directly operatively connected to the first connecting shaft.

27. The gearbox unit according to claim 12, wherein in that the coupling gearbox planetary carrier has at least the coupling gearbox planetary gear, which is designed as an outer planetary gear, and at least one inner planetary gear, which mesh with each other, wherein the outer planetary gear meshes with the coupling gearbox ring gear and the inner planetary gear meshes with the coupling gearbox sun gear.

28. The gearbox unit according to claim 13, wherein in that the coupling gearbox planetary carrier has at least the coupling gearbox planetary gear, which is designed as an outer planetary gear, and at least one inner planetary gear, which mesh with each other, wherein the outer planetary gear meshes with the coupling gearbox ring gear and the inner planetary gear meshes with the coupling gearbox sun gear.

29. The gearbox unit according to claim 14, wherein in that the coupling gearbox planetary carrier has at least the coupling gearbox planetary gear, which is designed as an outer planetary gear, and at least one inner planetary gear, which mesh with each other, wherein the outer planetary gear meshes with the coupling gearbox ring gear and the inner planetary gear meshes with the coupling gearbox sun gear.

30. The gearbox unit according to claim 15, wherein in that the coupling gearbox planetary carrier has at least the coupling gearbox planetary gear, which is designed as an outer planetary gear, and at least one inner planetary gear, which mesh with each other, wherein the outer planetary gear meshes with the coupling gearbox ring gear and the inner planetary gear meshes with the coupling gearbox sun gear.

Description

[0027] The invention will be explained in detail below on the basis of the exemplary embodiments illustrated in the drawing, without any limitation of the invention thereby occurring. Shown herein are:

[0028] FIG. 1 a gearbox unit for a motor vehicle in a first embodiment, and

[0029] FIG. 2 the gearbox unit in a second embodiment.

[0030] FIG. 1 shows a first embodiment of a gearbox unit 1 for a motor vehicle, which is indicated here only schematically. The motor vehicle has a first wheel axle 2 and a second wheel axle 3, which, in turn, are indicated only schematically, with the second wheel axle 3 being composed of at least one first sub-axle 4 and one second sub-axle 5. The gearbox unit 1, the first wheel axle 2, and the second wheel axle 3 form at least one part of a drivetrain of the motor vehicle. The gearbox unit 1 is equipped with a coupling gearbox 6, a first overlay gearing 7, and a second overlay gearing 8. The gearbox unit 1 has a drive input shaft 9, which is operatively connectible to a drive assembly 10 of the motor vehicle by way of a multispeed transmission 11, for example. Furthermore, the gearbox unit 1 is equipped with a drive output shaft 12, at which the first wheel axle 2 is connected via, for example, at least one gear stage 13 and/or an axle differential 14. An operative connection from the coupling gearbox 6 to the second wheel axle 3 or to the first sub-axle 4 and the second sub-axle 5 associated with it is present by way of a first connecting shaft 15 and a second connecting shaft 16. The first connecting shaft 15 is operatively connected to the first sub-axle 4 via a first gearbox member 17, which, for example, is present as a gear stage and the second connecting shaft 16 is operatively connected to the second sub-axle 5 via a second gearbox member 18, which, for example, also is present as a gear stage.

[0031] The coupling gearbox 6 is designed as a planetary gearing and has a coupling gearbox sun gear 19 and a coupling gearbox planetary carrier 20. Mounted rotatably at the coupling gearbox planetary carrier 20 are at least one outer planetary gear 21 and one inner planetary gear 22. The inner planetary gear 22 then meshes with the coupling gearbox sun gear 19 as well as with the outer planetary gear 21. The outer planetary gear 21, in contrast, meshes with the inner planetary gear 22 as well as with a coupling gearbox ring gear 23, which is likewise associated with the coupling gearbox 6.

[0032] In the exemplary embodiment illustrated here, the drive input shaft 9 is operatively connected or connected in a rotationally fixed manner rigidly and/or permanently to the coupling gearbox ring gear 23. The coupling gearbox planetary carrier 20 is operatively connected or connected in a rotationally fixed manner, in contrast, preferably rigidly and/or permanently, to the second connecting shaft 16. The first connecting shaft 15 is preferably operatively connected or connected in a rotationally fixed manner rigidly and/or permanently to the coupling gearbox sun gear 19.

[0033] The first overlay gearing 7 has a first overlay gearing sun gear 24, a first overlay gearing ring gear 25, and a first overlay gearing planetary carrier 26 with at least one overlay gearing planetary gear 27, which meshes with the first overlay gearing sun gear 24 and the first overlay gearing ring gear 25 and which is mounted rotatably at the first overlay gearing planetary carrier 26. For this purpose, the second overlay gearing 8 is composed analogously of a second overlay gearing sun gear 28, a second overlay gearing ring gear 29, and a second overlay gearing planetary carrier 30 with at least one second overlay gearing planetary gear 31, which meshes with the second overlay gearing sun gear 28 and the second overlay gearing ring gear 29 and which is mounted rotatably at the second overlay gearing planetary carrier 30.

[0034] The first overlay gearing sun gear 24 is directly operatively connected or coupled in a rotationally fixed manner to the second overlay gearing ring gear 29. At the same time, the first overlay gearing sun gear 24 and the second overlay gearing ring gear 29 are directly operatively connected or connected in a rotationally fixed manner to the first connecting shaft 15 and, accordingly, to the coupling gearbox sun gear 19. Additionally or alternatively, it can be provided that the first overlay gearing planetary carrier 26 is directly operatively connected or connected in a rotationally fixed manner to the second overlay gearing sun gear 28.

[0035] In addition, the first overlay gearing planetary carrier 26 and the second overlay gearing sun gear 28 are directly operatively connected or connected in a rotationally fixed manner to the coupling gearbox ring gear 23 and, accordingly, to the drive input shaft 9. In this case, the second overlay gearing sun gear 28 can be connected via the first overlay gearing planetary carrier 26 to the drive input shaft 9 or to the coupling gearbox ring gear 23. In this respect, the first overlay gearing 7 is arranged between the coupling gearbox 6 and the second overlay gearing 8 in the axial direction with respect to an axis of rotation of the drive input shaft 9, for example.

[0036] The gearbox unit 1 is further equipped with a first coupling 32 and a second coupling 33. With the help of the first coupling 32, the drive output shaft 12 is operatively connectible or can be coupled to the drive input shaft 9 by way of the first overlay gearing 7. When the coupling 32 is engaged, the first overlay gearing ring gear 25 is fixed with respect to the drive output shaft 12. Analogously to this, the second coupling 33 serves for establishing an operative connection between the drive output shaft 12 and the drive input shaft 9 by way of the second overlay gearing 8. In this case, when the coupling 33 is engaged, the second overlay gearing planetary carrier 30 is fixed with respect to the drive output shaft 12. Through deliberate, at least partial opening or closing of the couplings 32 and 33, a “torque vectoring” can be achieved between the first wheel axle 2 and the second wheel axle 3. In particular, torque can be transmitted from one of the sub-axles 4 and 5 or else from both sub-axles 4 and 5 onto the first wheel axle 2.

[0037] Furthermore, it can be seen that the drive input shaft 9 is operatively connected to the drive assembly 10 via a gear stage 34, in particular by way of the multispeed transmission 11. In addition, the drive output shaft 12 is arranged coaxially in the drive input shaft 9.

[0038] FIG. 2 shows a second embodiment of the gearbox unit 1. Fundamentally, reference is made to the previous statements, so that only differences will be addressed below. Whereas, in the scope of the first embodiment, the drive output shaft 12 is arranged coaxially in the drive input shaft 9, the inverse arrangement applies to the second embodiment. Accordingly, the drive input shaft 9 is arranged coaxially in the drive output shaft 12. The gear stage 34 can therefore be dispensed with. Although the first connecting shaft 15 is further directly operatively connected or connected in a rotationally fixed manner to the coupling gearbox sun gear 19, the connections between the first connecting shaft 15 and the first overlay gearing sun gear 24 and the second overlay gearing ring gear 29 are dispensed with. Instead, these connections are provided for the second connecting shaft 16. The second connecting shaft 16 is thus directly operatively connected, on the one hand, to the coupling gearbox planetary carrier 20. On the other hand, it is connected in a rotationally fixed manner to the first overlay gearing sun gear 24 and to the second overlay gearing ring gear 29. The gearbox unit 1 in the second embodiment essentially represents an inverse design of the first embodiment.