OIL-EVACUATED ELECTRICAL MACHINE HAVING ROLLING BEARINGS, FOR A MOTOR VEHICLE

Abstract

An electrical machine (10) for an electrically operable axle of a motor vehicle, having a shaft (12) with an axis of rotation (D), at least one bearing (14), wherein the shaft is rotatably mounted via the at least one bearing, at least one end shield (16), and at least one bearing ring (18), which is arranged coaxially with the axis of rotation (D). The at least one bearing is connected to the end shield via the bearing ring, and the bearing ring has at least one longitudinal recess (20a, 20b) on the outside for fluid evacuation. An electrically operated axle for a motor vehicle having the electrical machine is also provided.

Claims

1. An electrical machine for an electrically operable axle of a motor vehicle, the electrical machine comprising: a shaft having an axis of rotation, at least one bearing , the shaft being rotatably mounted via the at least one bearing, at least one end shield; and at least one bearing ring arranged coaxially to the axis of rotation, the at least one bearing being connected to the end shield via the bearing ring, and the bearing ring having at least one longitudinal recess on an outside thereof configured for fluid evacuation.

2. The electrical machine according to claim 1, wherein the at least one longitudinal recess is arranged on outer circumference of the bearing ring running in and extends parallel to the axis of rotation.

3. The electrical machine according to claim 1, wherein the at least one longitudinal recess is arranged on an end face of the bearing ring and extends perpendicular to the axis of rotation.

4. The electrical machine according to claim 1, wherein the at least one longitudinal recess includes a longitudinal recess that extends parallel to the axis of rotation and a longitudinal recess that extends perpendicular to the axis of rotation that are arranged in alignment with one another.

5. The electrical machine according to claim 1, wherein the bearing ring is a separate component or an outer ring of the bearing.

6. The electrical machine according to claim 1, wherein the bearing ring is positioned via a centering surface on the end shield.

7. The electrical machine according to claim 1, wherein the end shield has at least one circumferentially extending collecting recess configured for receiving fluid.

8. The electrical machine according to claim 1, wherein the end shield has at least one radially extending radial recess, and the at least one radial recess has a vertical main axis of extension.

9. The electrical machine according to claim 1, wherein the bearing ring is positioned via a centering surface on the end shield, the end shield has at least one circumferentially extending collecting recess configured for receiving fluid, the end shield has at least one radially extending radial recess, the at least one radial recess has a vertical main axis of extension, and the at least one longitudinal recess, the at least one collecting recess and the at least one radial recess form a fluid channel configured to conduct fluid out of the electrical machine.

10. An electrically operated axle for a motor vehicle comprising the having an electrical machine according to claim 1.

11. The electrical machine according to claim 1, wherein the at least one longitudinal recess includes a plurality of longitudinal recesses which are evenly distributed over a circumference of the bearing ring.

12. An electrical machine for an electrically operable axle of a motor vehicle, the electrical machine comprising: a shaft having an axis of rotation; at least one bearing, the shaft being rotatably mounted via the at least one bearing; at least one end shield; and at least one bearing ring arranged coaxially to the axis of rotation and connected to the end shield via the bearing ring, and the bearing ring includes at least one longitudinal recess extending on an axial face and on a radial face thereof configured for fluid evacuation.

13. The electrical machine of claim 12, wherein the at least one longitudinal recess includes a longitudinal recess that extends parallel to the axis of rotation and a longitudinal recess that extends perpendicular to the axis of rotation.

14. The electrical machine of claim 12, wherein the bearing ring is a separate component or an outer ring of the bearing.

15. The electrical machine of claim 12, wherein the bearing ring is positioned via a centering surface on the end shield.

16. The electrical machine of claim 15, wherein the end shield has at least one circumferentially extending collecting recess configured for receiving fluid.

17. The electrical machine of claim 16, wherein the end shield has at least one radially extending radial recess, and the at least one radial recess has a vertical main axis of extension.

18. The electrical machine of claim 16, wherein the at least one longitudinal recess, the at least one collecting recess and the at least one radial recess form a fluid channel configured to conduct fluid out of the electrical machine.

19. The electrical machine according to claim 18, wherein the at least one longitudinal recess includes a plurality of longitudinal recesses which are evenly distributed over a circumference of the bearing ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the following, the disclosure is explained by way of example with reference to the accompanying drawings using preferred exemplary embodiments, wherein the features shown below can represent an aspect of disclosure both individually and in combination. In the figures:

[0031] FIG. 1: shows an electrical machine according to the prior art,

[0032] FIG. 2: shows an electrical machine according to a preferred embodiment,

[0033] FIG. 3: shows an end shield for an electrical machine according to FIG. 2,

[0034] FIG. 4: shows a bearing ring for an electrical machine according to FIG. 2 in a first perspective view, and

[0035] FIG. 5: shows the bearing ring according to FIG. 4 in a second perspective view.

DETAILED DESCRIPTION

[0036] FIG. 1 shows an electrical machine 10 for an electrically operable axle of a motor vehicle according to the prior art.

[0037] FIG. 2 shows a preferably designed electrical machine 10 for an electrically operable axle of a motor vehicle, having [0038] a shaft 12 having an axis of rotation D, [0039] At least one bearing 14, wherein the shaft 12 is rotatably mounted through the at least one bearing 14, [0040] at least one end shield 16, [0041] at least one bearing ring 18, which is arranged coaxially to the axis of rotation D, wherein the at least one bearing 14 is connected to the end shield 16 via the bearing ring 18, and wherein the bearing ring 18 has a plurality of longitudinal recesses 20a, 20b on the outside thereof for fluid evacuation.

[0042] Through the large number of longitudinal recesses 20a, 20b in the bearing ring 18, the fluid, in particular oil, can flow into a collecting recess 22 arranged in the end shield 16. As a result, the fluid collects in the collecting recess 22. This is independent of the position of the bearing ring 18. The bearing ring 18 can be positioned on the end shield 16 by a centering surface. The fluid can then flow off through at least one radial recess 24 in the end shield 16 and no longer collects in the bearing region 26.

[0043] The illustrated end shield 16 is, for example, a B end shield. B end shields are preferably arranged on the fan side of an electrical machine 10.

[0044] According to a preferred embodiment, it is provided that a plurality of longitudinal recesses 20a are arranged on the outer circumference of the bearing ring 18 running in parallel to the axis of rotation D. This can be seen in FIGS. 2, 4, and 5.

[0045] According to a preferred embodiment, it is provided that a plurality of longitudinal recesses 20b is arranged on an end face of the bearing ring 18 running perpendicular to the axis of rotation D. This can be seen in FIGS. 2, 4, and 5.

[0046] According to a preferred embodiment, it is provided that a plurality of longitudinal recesses 20a are arranged in parallel to the axis of rotation D and a plurality of longitudinal recesses 20b are arranged to be perpendicular to the axis of rotation D in each case in alignment with one another. The longitudinal recesses 20a, 20b are in particular evenly distributed over the circumference of the bearing ring 18. This can be seen in FIGS. 4 and 5.

[0047] According to a preferred embodiment, it is provided that the bearing ring 18 is a separate component. This can be seen in FIGS. 2, 4, and 5.

[0048] According to a preferred embodiment, it is provided that the bearing ring 18 is positioned by a centering surface 21 on the end shield 16. This can be seen from FIGS. 2, 3, 4, and 5.

[0049] According to a preferred embodiment, it is provided that the end shield 16 has at least one circumferentially extending collecting recess 22 for receiving fluid. This can be seen in FIGS. 2 and 3.

[0050] According to a preferred embodiment, it is provided that the end shield 16 has at least one radially extending radial recess 24, wherein the at least one radial recess 24 preferably has a vertical main axis of extension. This can be seen in FIGS. 2 and 3.

[0051] According to a preferred embodiment, it is provided that the at least one longitudinal recess 20a, 20b, the at least one collecting recess 22, and the at least one radial recess 24 form a fluid channel to conduct fluid out of the electrical machine 10. This can be seen from FIGS. 2, 3, 4, and 5.

LIST OF REFERENCE SYMBOLS

[0052] 10 Electrical machine

[0053] 12 Shaft

[0054] 14 Bearing

[0055] 16 End shield

[0056] 18 Bearing ring

[0057] 20a Longitudinal recess parallel to the axis of rotation

[0058] 20b Longitudinal recess radial to the axis of rotation

[0059] 21 Centering surface

[0060] 22 Collecting recess

[0061] 24 Radial recess

[0062] 26 Bearing region

[0063] D Axis of rotation of the shaft