TORQUE TRANSMITTING SYSTEM WITH CONCENTRICALLY ARRANGED ROLLING BEARINGS, DRIVE UNIT, AND DRIVE ASSEMBLY

Abstract

A torque transmitting system, a drive unit, and a drive assembly are provided. The torque transmitting system includes a torque transmitting element and a support element which supports it via rotary bearings. The torque transmitting element has a first connection device for coupling to a first assembly in a rotationally fixed manner and a second connection device for coupling to a second assembly. One of the two elements forms a substantially hollow cylindrical shoulder, and the respective other element forms the outer cylindrical face and, correspondingly thereto, the inner face of a hollow cylinder radially outwards. The shoulder is arranged between the outer face and the inner face in a radial direction. A first rotary bearing is arranged between the outer face and the shoulder, and a second rotary bearing is arranged between the shoulder and the inner face. By using the torque transmitting system, less axial installation space is.

Claims

1. A torque transmitting system for transmitting a torque from at least one drive assembly, the torque transmitting system comprising: a torque transmitting element; a support element which supports the torque transmitting element via rotary bearings; the torque transmitting element has a first connection device for coupling the torque transmitting element to a first assembly in a rotationally fixed manner, and a second connection device for coupling the torque transmitting element to a second assembly in a rotationally fixed manner; one of the torque transmitting element or the support element forms a substantially hollow cylindrical shoulder, and the other of the torque transmitting element or the support element forms an outer face of a cylinder and, correspondingly thereto, an inner face of a hollow cylinder radially outwards; wherein the shoulder is arranged between the outer face of the cylinder and the inner face of the hollow cylinder in a radial direction; and a first rotary bearing is arranged between the outer face of the cylinder and the shoulder, and a second rotary bearing is arranged between the shoulder and the inner face of the hollow cylinder.

2. The torque transmitting system according to claim 1, wherein the two rotary bearings have substantially a same axial position in relation to a common axis of rotation.

3. The torque transmitting system according to claim 2, wherein the two rotary bearings comprise tapered roller bearings, and pressure lines of the two bearings have a gradient with a same sign in relation to the common axis of rotation.

4. The torque transmitting system according to claim 1, wherein the shoulder has a projection, extending radially inwards from the hollow cylindrical shape, for axially contacting an outer ring of the first rotary bearing and a portion, extending radially outwards from the hollow cylindrical shape, for axially contacting an inner ring of the second rotary bearing.

5. The torque transmitting system according to claim 1, wherein one of the torque transmitting element or the support element has a radially extending portion for axially contacting an outer ring of the second rotary bearing.

6. The torque transmitting system according to claim 1, wherein the cylinder is configured as a further hollow cylinder and the first connection device is configured on an inner wall of the further hollow cylinder.

7. The torque transmitting system according to claim 1, further comprising a substantially radially extending web, on a first axial side of which the rotary bearings are arranged, and on a second, axially opposite axial side of which the second connection device is configured as a second toothing, and a tool run-out (d) in an axial direction between the second toothing and the web.

8. The torque transmitting system according to claim 1, wherein the support element forms the substantially hollow cylindrical shoulder, and the torque transmitting element forms the outer face of the cylinder and forms the inner face of the hollow cylinder radially outwards.

9. A drive unit for a drivetrain of an electrically drivable motor vehicle, comprising the torque transmitting system according to claim 1; and an electric drive device and a shaft, a rotor of the electric drive device is connected to the shaft in a rotationally fixed manner and the shaft is coupled to the torque transmitting element of the torque transmitting system for transmitting a torque.

10. A drive assembly comprising the drive unit according to claim 9, and an internal combustion engine coupled or couplable in a rotationally fixed manner to the torque transmitting element.

11. A torque transmitting system for transmitting a torque from at least one drive assembly, the torque transmitting system comprising: a torque transmitting element; a support element which supports the torque transmitting element via rotary bearings; the torque transmitting element includes a first connection part configured for connection to a first assembly in a rotationally fixed manner, and a second connection part configured for coupling to a second assembly in a rotationally fixed manner; one of the torque transmitting element or the support element forms a substantially hollow cylindrical shoulder, and the other of the torque transmitting element or the support element forms a central part with an outer face and, spaced apart radially outward therefrom, a radially inwardly facing face; the shoulder is arranged between the outer face and the radially inwardly facing face of the hollow cylinder in a radial direction; and a first rotary bearing is arranged between the outer face and the shoulder, and a second rotary bearing is arranged between the shoulder and the radially inwardly facing face.

12. The torque transmitting system according to claim 11, wherein the two rotary bearings have substantially a same axial position in relation to a common axis of rotation.

13. The torque transmitting system according to claim 11, wherein the two rotary bearings comprise tapered roller bearings, and pressure lines of the two bearings have a gradient with a same sign in relation to the common axis of rotation.

14. The torque transmitting system according to claim 11, wherein the shoulder has a projection that extends radially inwardly from the hollow cylindrical shape, for axially contacting an outer ring of the first rotary bearing and a portion, extending radially outwardly from the hollow cylindrical shape, for axially contacting an inner ring of the second rotary bearing.

15. The torque transmitting system according to claim 11, wherein one of the torque transmitting element or the support element has a radially extending portion for axially contacting an outer ring of the second rotary bearing.

16. The torque transmitting system according to claim 11, wherein the central part is configured as a hollow and the first connection part is located on an inner wall of the hollow cylinder.

17. The torque transmitting system according to claim 11, further comprising a substantially radially extending web, the rotary bearings are arranged on a first axial side of the web, and the second connection part comprises a second toothing located on a second axial side of the web.

18. The torque transmitting system according to claim 11, wherein the support element forms the substantially hollow cylindrical shoulder, and the torque transmitting element forms the center part with the outer face and the radially inwardly facing face.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The embodiments described above are explained in detail below based on the relevant technical background with reference to the associated drawings, which show preferred embodiments. The disclosure is in no way restricted by the purely schematic drawings, although it should be noted that the embodiments shown in the drawings are not limited to the dimensions shown. In the drawings:

[0077] FIG. 1: shows a torque transmitting system according to the background of the art an

[0078] FIG. 2: shows a torque transmitting system according to the disclosure.

DETAILED DESCRIPTION

[0079] FIG. 1 has already been discussed to explain the background of the art.

[0080] FIG. 2 shows a torque transmitting system 10 according to one embodiment.

[0081] Similar to the torque transmitting system 10 shown in FIG. 1, the torque transmitting system 10 according to the invention also comprises a torque transmitting element 11 and a support element 20, wherein the torque transmitting element 11 is designed as a ring gear and the support element 20 is a rotationally fixed component of a housing, such as a housing of a drive assembly.

[0082] In the cross section shown, the torque transmitting element 11 has a radially extending web 80, wherein the torque transmitting element 11 has a first connection device 12 on the first axial side 81 of the web 80 and a second connection device 13 on the second axial side 82 of the web 80.

[0083] The first connection device 12 is designed as an internal toothing, in particular a spline, and is used for the rotationally fixed coupling of the torque transmitting element 11 to a first assembly, such as an internal combustion engine.

[0084] The second connection device 13 is also designed as an internal toothing, in particular an internal helical toothing, and is used for the rotationally fixed coupling of the torque transmitting element 11 to a second assembly, such as an electric drive device, which can function both as an electric motor and as an electric generator.

[0085] The second connection device 13 is arranged on a radial inner face of an axial extension of a portion of a hollow cylinder 16 of the torque transmitting element 11, wherein a tool run-out d is formed axially between the second connection device 13 and the second axial side 82 of the web 80. The tool run-out d is used to create sufficient clearance for a tool during the manufacture of the second connection device 12, for example during milling or skiving. The tool run-out d, measured from an end of the second connection device 13 facing the web 80 to the web 80 itself, has the relationship d>5 Zh with respect to a tooth height Zh of the teeth of the second connection device 13.

[0086] The first connection device 12 is formed on an inner wall of a cylinder 14 of the torque transmitting element 11, which cylinder is configured as a further hollow cylinder 24.

[0087] The support element 20 is arranged on the second axial side 82 of the web 80 and forms a substantially hollow cylindrical shoulder 21.

[0088] The torque transmitting element 11 forms an outer face 15 of a cylinder 14, which in this embodiment is also realized as a further hollow cylinder 24 and, correspondingly thereto, also forms an inner face 17 of a hollow cylinder 16 radially outwards. The shoulder 21 of the support element 20 is arranged in the radial direction between the outer face 15 of the cylinder 14 and the inner face 17 of the hollow cylinder 16, wherein a first rotary bearing 30 is arranged between the outer face 15 of the cylinder 14 and the shoulder 21, and a second rotary bearing 40 is arranged between the shoulder 21 and the inner face 17 of the hollow cylinder 16.

[0089] The outer face 15 of the cylinder 14, the inner face 17 of the hollow cylinder 16 and the shoulder 21 extend substantially coaxially with respect to an axis of rotation 1 of the torque transmitting element 11.

[0090] The rotary bearings 30, 40 have a substantially identical axial position in relation to the common axis of rotation 1.

[0091] The first rotary bearing 30 rests with its outer ring 31 in the radial direction against the radial inner face of the shoulder 21 of the support element 20. In the axial direction, the first rotary bearing 30 rests against a side, facing axially away from the web 80, of a radially inwardly extending projection 22 of the shoulder 21 of the support element 20. With its inner ring 32, the first rotary bearing 30 rests in the radial direction against the radial outer face 15 of the cylinder 14 or the further hollow cylinder 24. In the axial direction, the first rotary bearing 30 rests against a shim 73. The shim 73 is axially fixed on the axial side opposite the first rotary bearing 30 by a securing element 70 designed as a securing ring 72 and is used to adjust the axial distance between the securing element 70 and the first rotary bearing 30. For this purpose, the securing ring 72 is arranged interlockingly in a circumferential groove on the radial outer face 15 of the cylinder 14 or of the further hollow cylinder 24, such that an axial position of the first rotary bearing 30 is secured.

[0092] The second rotary bearing 40 rests with its outer ring 41 in the radial direction against the radial inner face 17 of the hollow cylinder 16 and in the axial direction against a radially extending portion 18 of the torque transmitting element 11. With its inner ring 42, the second rotary bearing 40 rests in the radial direction against the radial outer face of the shoulder 21 of the support element 20 and in the axial direction against a portion 23 formed by the portion 21 of the support element 20 and extending radially outwards.

[0093] The two rotary bearings 30, 40 are designed as tapered roller bearings, wherein the pressure lines 50 of both rotary bearings 30, 40 have a gradient with the same sign in relation to the common axis of rotation 1. The pressure line 50 of the first rotary bearing 30 thus extends substantially parallel to the pressure line 50 of the second rotary bearing 40. The gradient of an axis of rotation 51 of a rotary bearing 30, 40 thus has an opposite sign in relation to the common axis of rotation 1 than the gradient of the pressure line 50. The axes of rotation 51 of the rotary bearings 30, 40 thus extend substantially parallel to one another.

[0094] This ensures an axial bracing of the torque transmitting element 11 in relation to the support element 20, such that the axial position of the torque transmitting element 11 is secured in relation to the axial position of the support element 20.

[0095] With the torque transmitting system according to the invention and the drive unit and drive assembly, a low axial installation space requirement can be achieved in a cost-effective and structurally simple manner.

LIST OF REFERENCE SIGNS

[0096] 1 Axis of rotation [0097] 10 Torque transmitting system [0098] 11 Torque transmitting element [0099] 12 First connection device [0100] 13 Second connection device [0101] 14 Cylinder [0102] 15 Outer face of the cylinder [0103] 16 Hollow cylinder [0104] 17 Inner face of the hollow cylinder [0105] 18 Radially extending portion [0106] 20 Support element [0107] 21 Shoulder [0108] 22 Projection [0109] 23 Radially outwardly extending portion [0110] 24 Further hollow cylinder [0111] 30 First rotary bearing [0112] 31 Outer ring of the first rotary bearing [0113] 32 Inner ring of the first rotary bearing [0114] 40 Second rotary bearing [0115] 41 Outer ring of the second rotary bearing [0116] 42 Inner ring of the second rotary bearing [0117] 50 Pressure line [0118] 51 Axis of rotation [0119] 60 Seal [0120] 70 Securing element [0121] 71 Nut [0122] 72 Securing ring [0123] 73 Shim [0124] 80 Web [0125] 81 First axial side [0126] 82 Second axial side [0127] d Tool run-out [0128] Zh Tooth height