ELECTRIC MACHINE

Abstract

An electric machine, in particular for use within the powertrain of a hybrid or fully electric motor vehicle, having a stator and a rotor, said stator and rotor being received in an engine housing The engine housing has at least one A-bearing shield and at least one B-bearing shield for supporting the rotor relative to the engine housing, wherein the A-bearing shield and/or the B-bearing shield has/have a two-part design, in each case having a respective intermediate inner shield which is arranged axially between the stator and a cover shield that can be fixed to the engine housing, and the intermediate shield receives a bearing for the rotor. The cover shield can be releasably fixed to the intermediate shield side facing away from the stator, and the cover shield has centering means for radially centering the intermediate shield.

Claims

1. An electric machine, in particular for use within a drive train of a hybrid or fully electrically driven motor vehicle, comprising a stator and a rotor, which are received in a motor housing, wherein the motor housing has at least one D end shield and at least one N end shield for supporting the rotor relative to the motor housing, wherein at least one of the D end shield or the N end shield has a two-part design, with an intermediate shield is arranged axially between the stator and a cover shield fixed to the motor housing, wherein the intermediate shield receives a bearing of the rotor, and the cover shield is releasably fixed to a side of the intermediate shield facing away from the stator, and the cover shield has a centering element for radially centering the intermediate shield.

2. The electric machine according to claim 1, Wherein the intermediate shield has a double-T cross-sectional contour with a radially outer axial section and a radially inner axial section

3. The electric machine according to claim 1 wherein the cover shield is fixed to the radially outer axial section of the intermediate shield.

4. The electric machine according to claim 3, wherein the cover shield is fixed to the radially inner axial section of the intermediate shield.

5. The electric machine according to claim 4, wherein the centering element of the cover shield comprises an axial section which projects in an axial direction from the cover shield and is engaged in the double-T contour radially between the outer axial section and the inner axial section of the intermediate shield to fix a radial position of the intermediate shield.

6. The electric machine according to claim 5, wherein the axial section of the cover shield rests against a radially outer lateral surface of the inner axial section of the intermediate shield.

7. The electric machine according to claim 3 wherein a radial connection between the outer axial section and the inner axial section of the intermediate shield comprises a spoke.

8. The electric machine according to claim 1, wherein the intermediate shield is comprised of a cast metal material.

9. An electric machine for a drive train of a hybrid or fully electrically driven motor vehicle, comprising: a stator; a rotor; and a motor housing in which the stator and rotor are received; wherein the motor housing includes a body and at least one D end shield and at least one N end shield for supporting the rotor relative to the body; wherein at least one of the D end shield or the N end shield includes an intermediate shield and a cover shield; wherein the cover shield is fixed to the body; wherein the intermediate shield is arranged axially between the stator and the cover shield; wherein the intermediate shield receives a bearing of the rotor; and wherein the cover shield is releasably fixed to a side of the intermediate shield facing away from the stator; and wherein the cover shield includes a centering element for radially centering the intermediate shield.

10. The electric machine according to claim 9, wherein the intermediate shield has a double-T cross-sectional contour with a radially outer axial section and a radially inner axial section.

11. The electric machine according to claim 10, wherein the cover shield is fixed to the radially outer axial section of the intermediate shield.

12. The electric machine claim 11, wherein the cover shield is fixed to the radially inner axial section of the intermediate shield.

13. The electric machine according to claim 12, wherein the centering element of the cover shield comprises an axial section which projects in an axial direction from the cover shield and is engaged in the double-T contour radially between the outer axial section and the inner axial section of the intermediate shield to fix a radial position of the intermediate shield.

14. The electric machine according to claim 13, wherein the axial section of the cover shield rests against a radially outer lateral surface of the inner axial section of the intermediate shield.

15. The electric machine according to claim 10, wherein a radial connection between the outer axial section and the inner axial section of the intermediate shield comprises a spoke.

16. The electric machine according to claim 1, wherein the intermediate shield is comprised of a cast metal material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure will be explained in more detail below with reference to figures without limiting the general concept of the disclosure.

[0022] In the figures:

[0023] FIG. 1 shows a first embodiment of an electric machine in a schematic longitudinal sectional view, and

[0024] FIG. 2 shows a second embodiment of an electric machine in a schematic longitudinal sectional view.

DETAILED DESCRIPTION

[0025] FIG. 1 shows a first embodiment of an electric machine 1, in particular for use in a drive train of a hybrid or fully electrically driven motor vehicle, comprising a stator 2 and a rotor 3, which are received in a motor housing 4. The motor housing 4 has a D end shield 5 and an N end shield 6 for supporting the rotor 3 relative to the motor housing 4. In the embodiment shown, the N end shield 6 is of two-part design, with an intermediate shield 7 in each case, which is arranged axially between the stator 2 and a cover shield 8 that can be fixed to the motor housing 4. The intermediate shield 7 receives a bearing 9 of the rotor 3. The cover shield 8 can be releasably fixed to the side of the intermediate shield 7 facing away from the stator 2. In the embodiment shown, this fixation is realized by means of a screw connection not specified in further detail.

[0026] The cover shield 8 also has a centering means 10 for radially centering the intermediate shield 7, the operating principle of which is explained in more detail below.

[0027] FIG. 1 shows that the intermediate shield 7 has a double-T-like cross-sectional contour with a radially outer axial section 11 and a radially inner axial section 12. The cover shield 8 is fixed to the radially outer axial section 11 of the intermediate shield 7 by means of a screw connection.

[0028] The centering means 10 of the cover shield 8 is formed as an axial section 13 projecting in the axial direction from the cover shield 8, which engages in the double-T contour radially between the outer axial section 11 and the inner axial section 10 of the intermediate shield 7 in such a way that the radial position of the intermediate shield 7 is fixed. For this purpose, the axial section 13 of the cover shield 8 rests against the radially outer lateral surface of the inner axial section 10 of the intermediate shield 7.

[0029] The radial connection 14 between the outer axial section 11 and the inner axial section 10 of the intermediate shield 7 can, in particular, be of a spoke-like design. The intermediate shield 8 is formed from a cast metal material, in particular gray cast iron.

[0030] FIG. 2 shows a further embodiment of the disclosure in which, in addition to the screw connection on the radially outer axial section 11 of the intermediate shield 7, the cover shield 8 is fixed on the radially inner axial section 12 of the intermediate shield 7.

[0031] The disclosure is not limited to the embodiments shown in the figures. The above description is therefore not to be regarded as limiting, but rather as illustrative. The following claims are to be understood as meaning that a named feature is present in at least one embodiment of the disclosure. This does not exclude the presence of further features. If the patent claims and the above description define first and second features, this designation serves to distinguish between two features of the same type without defining an order of precedence.

LIST OF REFERENCE SYMBOLS

[0032] 1 Machine [0033] 2 Stator [0034] 3 Rotor [0035] 4 Motor housing [0036] D end shield [0037] 6 N end shield [0038] 7 Intermediate shield [0039] 8 Cover shield [0040] 9 Bearing [0041] 10 Centering means [0042] 11 Axial section [0043] 12 Axial section [0044] 13 Axial section [0045] 14 Connection