Electric machine with cooling fluid supply device for vehicle

Abstract

The present invention provides an electric machine for a vehicle, the electric machine comprising a stator (1) located in a housing (2) and a rotor (3) rotatably supported in the housing (2) via a rotor shaft (22), wherein a cooling fluid supply device is provided, the cooling fluid supply device supplies cooling fluid to a closed cooling fluid circuit (7) of the rotor (3), wherein a rotary joint with at least two channels for guiding the cooling fluid is provided between the cooling fluid supply device arranged outside the housing (2) and the cooling fluid circuit (7) of the rotor (3).

Description

Technical Field

[0001] The invention relates to an electric machine for a vehicle, which has a stator located in a housing and a rotor rotatably supported in the housing via a rotor shaft, wherein a cooling fluid supply device is provided, which supplies cooling fluid to a closed cooling fluid circuit of the rotor. Background Art

[0002] It is known from vehicle technology that the power of electric machines and their service life are significantly influenced by the operating temperature that rises due to the waste heat generated. It is therefore essential for the optimal operation of the electric machine to dissipate the generated heat from the housing of the electric machine as efficiently as possible. For this purpose, a corresponding cooling fluid supply device for a cooling circuit is proposed.

[0003] A cooling device for a rotor of an electric machine is known from WO 87 037 48 A1, in which a cooling fluid is supplied to the hollow shaft of the rotor by means of a cooling fluid supply device in order to dissipate heat.

[0004] However, it has been shown that heat can be dissipated significantly better if the rotating rotor is provided with a closed cooling fluid circuit in order to be able to optimally dissipate the heat of the rotor and the heat of the stator of the winding head. However, conveying the cooling fluid from the housing into the rotating rotor is structurally complex and expensive. Summary of the invention

[0005] The invention is based on the object of specifying an electric machine having a coolant supply device which allows particularly efficient and cost-effective cooling in the interior of the housing.

[0006] According to the invention, this object is achieved by the features of the electric machine according to the invention.

[0007] Therefore, an electric machine for a vehicle is proposed, the electric machine having a stator located in a housing and a rotor rotatably supported in the housing via a rotor shaft, wherein a cooling fluid supply device is provided, the cooling fluid supply device supplies cooling fluid to a closed cooling fluid circuit. In order to achieve the best possible cooling, it is proposed that a rotary joint with at least two channels for guiding or conveying cooling fluid is provided between the cooling fluid supply device arranged outside the housing and the cooling fluid circuit connected to the rotor.

[0008] By supplying cooling fluid from a cooling fluid circuit connected to the rotor and the rotor shaft, the cooling fluid is guided almost through the rotor in order to be able to optimally dissipate heat from the rotor, the rotor shaft, the winding heads of the stator, the stator itself and other components. By using a two-channel swivel joint, the cooling fluid is guided from the outside through the housing into the cooling fluid circuit of the rotor or the rotor shaft. By providing a two-channel swivel joint, it is possible to guide the cooling fluid separately from the cooling fluid inlet and the cooling fluid outlet in a structurally simple and cost-effective manner.

[0009] Within the scope of the invention, the swivel joint is preferably realized by a first distributor sleeve facing the housing and a second distributor sleeve connected to the rotor in a rotationally fixed manner, wherein the first distributor sleeve at least in sections extends axially inside the second distributor sleeve or is arranged in this second distributor sleeve. In this way, the swivel joint for the cooling fluid is realized in a structurally simple manner with only two components. The cooling fluid passes through the contour formed by the two distributor sleeves, through the housing, into the interior of the cooling fluid circuit leading to the rotor, and then returns from the housing again via a separate contour to the cooling fluid supply device.

[0010] Regardless of the structural embodiment variant of the swivel joint, a fluid inlet for the cooling fluid circuit is provided between the outer circumference of the first distributor sleeve and the inner circumference of the second distributor sleeve, while an axial hole through the center of the first distributor sleeve is provided as a cooling fluid outlet for the cooling fluid supply device. Thus, a separate inlet and outlet of the cooling fluid is achieved via the provided swivel joint.

[0011] In a first embodiment variant of the invention, it can be provided, for example, that the first distributor sleeve is connected to the housing. The first distributor sleeve can be pressed into the housing, preferably into the bearing cover of the housing, for example. Other fixing methods that are also cost-effective and simple in structure are also possible. Thus, a stationary first distributor sleeve is provided, which is introduced into the interior of the second distributor sleeve in sections in the axial direction, thereby ensuring a seal between the rotating second distributor sleeve and the fixed first distributor sleeve. For sealing on the housing side, advantageously only one seal is required.

[0012] When using a first distributor sleeve that is fixed to the housing or stationary, the inlet opening of the cooling fluid supply device is assigned to the facing end of the first distributor sleeve in a fixed manner so that the inlet opening of the cooling fluid supply device is connected in a flow sense to the cooling fluid guide device in the first distributor sleeve, for example by means of a suitable gap on the outer circumference of the first distributor sleeve. A flat or planar or otherwise shaped gap can be used as the gap.

[0013] The gap portion is connected in a flow sense to the gap space provided in the circumferential direction of the first sleeve so that the inflowing cooling fluid can flow in the direction of the second distributor sleeve. For example, a gap space formed in an annular shape or similarly can be provided as the gap space. The gap space is in flow connection with the first radial hole of the second distributor sleeve so that the cooling fluid can flow through the first radial hole of the rotating second distributor sleeve so that it can be delivered to the inlet of the cooling fluid circuit of the rotor through the first planar gap portion on the outer circumference of the second distributor sleeve.

[0014] After flowing through the cooling fluid circuit inside or on the surface of the rotor and the rotor shaft, the cooling fluid is guided back to the double-channel swivel joint, wherein the outflow of the cooling fluid circuit is assigned to a second gap on the outer circumference of the second distributor sleeve, which is connected to the second radial hole of the second distributor sleeve in terms of flow, so that the fluid is conveyed to the central axial hole of the stationary first distributor sleeve, so that it can finally be conveyed from the radial hole of the first distributor sleeve to the outflow of the cooling fluid supply device on the housing side. In order to ensure that the inflow and outflow of the cooling fluid in the second distributor sleeve connected to the stationary first distributor sleeve are separated, it is proposed that the first radial hole of the second distributor sleeve and the second radial hole of the second distributor sleeve are arranged axially offset from each other. In order to also separate the inflow and outflow of the cooling fluid supply device on the housing side, it is proposed on the first distributor sleeve that the gap and the radial hole at the end of the first distributor sleeve facing the housing are arranged circumferentially offset from each other.

[0015] A second embodiment variant of the invention provides that in the proposed swivel joint a first distributor sleeve is connected to a second distributor sleeve. In this second embodiment variant, the first distributor sleeve is also supported in the housing in a manner that rotates with the rotor shaft, just like the second distributor sleeve, by connecting the second distributor sleeve to the rotor in a rotationally fixed manner. Thus, in the case of a rotational transport between the inlet or outlet of the cooling fluid supply on the housing side, a corresponding contour is provided at the facing end of the rotating first distributor sleeve.

[0016] As a particularly simple contour, a gap space provided on the outer circumference, preferably an annular gap space, is provided at the end facing the inlet of the cooling fluid supply device. As a result, the cooling fluid can flow into the annular gap space of the rotating first distributor sleeve via the stationary inlet fixed to the housing. The annular gap space is connected to the flat gap portion on the outer circumference of the first distributor sleeve in terms of flow, so that the cooling fluid flowing in is guided further in the direction of the second distributor sleeve, which is fixed to the first distributor sleeve, preferably pressed.

[0017] The circumferential flat gap of the first distributor sleeve is assigned to the first radial hole of the second distributor sleeve. Since the first distributor sleeve and the second distributor sleeve are connected to each other in a rotationally fixed manner, the cooling fluid can be guided from the flat gap through the first radial hole into the first flat gap on the outer circumference of the second distributor sleeve to the inlet channel of the cooling fluid circuit of the rotor.

[0018] After flowing through the cooling fluid circuit, the cooling fluid is guided back to the outflow channel of the cooling fluid circuit, which is assigned to the second planar gap on the outer circumference of the second distributor sleeve, which in turn is connected to the second radial hole of the second distributor sleeve in terms of flow. The second radial hole of the second distributor sleeve is aligned in a coincident manner with the radial hole of the first distributor sleeve, which in turn is connected to the central axial hole of the first distributor sleeve in terms of flow to discharge the cooling fluid from the first distributor sleeve.

[0019] Since no relative movement is possible when the first and second distributor sleeves are connected to one another in a rotationally fixed manner, the first radial holes and the second radial holes of the second distributor sleeve can advantageously be arranged opposite each other in the circumferential direction.

[0020] A further advantage of the invention is that the cooling fluid inlet channel and the cooling fluid outlet channel of the housing-side cooling fluid supply device are arranged on the axial side of the electric machine. This is achieved in that both the inlet channel and the outlet channel of the cooling fluid supply device are integrated into the bearing cover of the housing. Thus, a closed cooling system is achieved, which has a hydraulic connection for the inlet channel and the outlet channel of the cooling supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with the aid of the accompanying drawings. In the accompanying drawings:

[0022] Figure 1 A partial sectional view of a first embodiment variant of an electric machine having a swivel joint for connecting a cooling fluid supply on the housing side to a cooling fluid circuit of a rotor in terms of flow;

[0023] Figure 2 another cross-sectional view showing the electric machine at an altered cross-sectional perspective;

[0024] Figure 3 Shown according to Figure 1 and Figure 2 A separate component view of a first stationary distributor sleeve of a swivel joint of a first embodiment variant of the electric machine shown in FIG.

[0025] Figure 4 Shown according to Figure 1 and Figure 2 Detailed description of the drawings; FIG. 1 is a diagram showing a first embodiment of the electric machine, a second distributor sleeve of the rotary joint, a separate component view of the first embodiment of the electric machine shown in FIG. 1 ;

[0026] Figure 5 Shown according to Figure 1 and Figure 2 A sectional view of a first distributor sleeve and a second distributor sleeve in an assembled state of a first embodiment variant of the electric machine shown in FIG.

[0027] Figure 6 A partial view of a second embodiment variant of an electric machine having a swivel joint for connecting a cooling fluid supply on the housing side to a cooling fluid circuit of the rotor in terms of flow;

[0028] Figure 7 Shown in a changed cross-sectional perspective according to Figure 6 Another cross-sectional view of;

[0029] Figure 8 Shown according to Figure 6 and Figure 7 A separate component view of a first distributor sleeve of a swivel joint of a second embodiment variant of the electric machine shown in FIG.

[0030] Fig. 9 Shown according to Figure 6 and Figure 7 A separate component view of a second distributor sleeve of a swivel joint of a second embodiment variant of the electric machine shown in FIG. 1 ; and

[0031] Fig.10 Shown according to Figure 6 and Figure 7 sectional view of a first distributor sleeve and a second distributor sleeve of a second embodiment variant of the electric machine shown in the assembled state. DETAILED DESCRIPTION

[0032] exist Figures 1 to 5 , a first embodiment variant of the electric machine according to the invention for a vehicle is shown by way of example, which has a swivel joint for connecting a cooling fluid supply on the housing side to a cooling fluid circuit 7 of the rotor 3 in terms of flow, and Figures 6 to 10 A second embodiment variant of an electric machine with a modified rotary joint is shown by way of example.

[0033] Independently of the respective embodiment variant, the electric machine comprises a stator 1 in a housing 2 and a rotor 3 rotatably supported in the housing 2 via a rotor shaft 22. A stationary cooling fluid supply device fixed to the housing or on the housing side is hydraulically connected to a bearing cover 6 of the housing 2 via a cooling fluid inlet channel 4 and a cooling fluid outlet channel 5 and is advantageously integrated into the bearing cover.

[0034] In order to supply the cooling fluid, a dual-channel rotary joint for the cooling fluid is provided between the cooling fluid supply device arranged outside the housing and the cooling fluid circuit 7 connected to the rotor shaft 22 and the rotor 3. As the cooling fluid, water or a water-glycol mixture can be preferably used or other fluids (such as oil) can also be used. The rotor shaft 22 is connected to the drive shaft 23 of the electric machine to transmit torque.

[0035] A separate cooling fluid inlet and a separate cooling fluid outlet are achieved by means of a two-channel swivel joint. The swivel joint comprises a first distributor sleeve 8, 8A and a second distributor sleeve 9, 9A, wherein the second distributor sleeve 9, 9A is connected to the rotor 3 in a rotationally fixed manner and can serve as a sensor wheel for a rotation speed sensor of the electric machine as an additional function.

[0036] The first distributor sleeve 8, 8A faces the bearing cover 6 of the housing 2, wherein at least a section of the first distributor sleeve 8, 8A is axially arranged inside the rotating second distributor sleeve 9, 9A. The first distributor sleeve 8, 8A and the second distributor sleeve 9, 9A of the swivel joint form a cooling fluid guide contour for guiding the cooling fluid in the assembled state. A cooling fluid introduction device for the cooling fluid circuit 7 is provided between the outer periphery of the first distributor sleeve 8, 8A and the inner periphery of the second distributor sleeve 9, 9A, and an axial hole 18, 18A passing through the center of the first distributor sleeve 8, 8A is provided as a cooling fluid outlet device for the cooling fluid supply device.

[0037] Within the scope of the first embodiment variant of the electric machine according to the invention, it is provided in the rotary joint that the first distributor sleeve 8 is connected to the housing 2 in a fixed manner. The first distributor sleeve 8 is therefore arranged stationary, while the second distributor sleeve 9 is supported in the housing 2 in a rotatable manner with the rotor shaft 22 and the rotor 3. In the installed state, the first distributor sleeve 8 is arranged axially inside the second distributor sleeve 9 in a sealed manner.

[0038] In order to realize the cooling fluid guidance in the electric machine by means of a swivel joint within the scope of the first embodiment variant, it is proposed that the first distributor sleeve 8 has a flat gap 10 on the outer circumference at the end facing the housing 2 or the bearing cover 6 for the cooling fluid to enter from the inflow channel 4 of the cooling fluid supply device. The stationary first distributor sleeve 8 is pressed into the bearing cover 6 of the housing 2 in a sealing manner. Figure 1 and Figure 2 The path of the rotating cooling fluid is shown by arrows.

[0039] The plane gap 10 is connected in flow terms to the first radial hole 12 of the second distributor sleeve 9 via the annular gap space 11 on the outer circumference of the first distributor sleeve 8. The first radial hole 12 is connected in flow terms to the inflow channel 14 of the cooling fluid circuit 7 of the rotor 3 via the first plane gap 13 on the outer circumference of the second distributor sleeve 9. Therefore, the introduced cooling fluid can flow through the rotor 3 or along the outer shell area of ​​the rotor 3 and the rotor shaft 22, so as to correspondingly dissipate heat from the rotor 3 and surrounding components of the electric machine.

[0040] The outflow channel 15 of the cooling fluid circuit 7 of the rotor 3 is connected in flow terms to the second radial bore 17 of the second distributor sleeve 9 via the second planar gap 16 on the outer circumference of the second distributor sleeve 9. The second radial bore 17 is connected in flow terms to the central axial bore 18 of the first distributor sleeve 8. The central axial bore 18 of the first distributor sleeve 8 is in turn connected in flow terms to the radial bore 19 for the cooling fluid to be discharged from the first distributor sleeve 8. For this purpose, the radial bore 19 of the first distributor sleeve 8 is connected to the outflow channel 5 of the cooling fluid supply device in the bearing cover 6, for example, by a hydraulic connection.

[0041] In particular, the two assembled distributor sleeves 8, 9 are Figure 3 and Figure 4 Individual component views and according to Figure 5 The structural construction of each component can be seen in the cross-sectional view.

[0042] Figure 3For example, a separate component view of the first distributor sleeve 8 is shown, in which the planar gap portion 10 and the radial holes 19 of the first distributor sleeve 8 are arranged offset from each other in the circumferential direction of the first distributor sleeve 8. In this way, it is ensured that the inlet and outlet of the cooling fluid are separated. The gap portion 10 is connected to the annular gap space 11 on the outer circumference of the first distributor sleeve 8 in a flow sense. In order to limit the annular gap space 11 at the end of the first distributor sleeve 8 facing the rotor 3, a spacer or an enlarged diameter range 20 is provided on the first distributor sleeve 8. In addition, the centrally arranged axial hole 18 is connected to the radial hole 19 in a flow sense at the end of the first distributor sleeve 8 facing the bearing cover 6. Figure 3 The end can be seen in .

[0043] exist Figure 4 1 shows a separate component view of the second distributor sleeve 9, which in the installed state axially accommodates the first distributor sleeve 8 therein, for example Figure 5 The second distributor sleeve 9 has a first planar gap portion 13 on the outer circumference, and the first planar gap portion is connected to the Figure 2 , the inflow channel 14 of the cooling fluid circuit 7 of the rotor 3 is connected in terms of flow. At the end of the first gap portion 13 facing the bearing cover 6, there is a first radial hole 12, which is connected in terms of flow to the annular gap space 11 arranged inside the first distributor sleeve 8. In particular, according to Figure 5 As can be seen from the illustration, the first radial hole 12 and the second radial hole 17 of the second distributor sleeve 9 are arranged axially offset from each other. This is necessary so that the outlet for cooling fluid is separated from the inlet for cooling fluid by the central axial hole 18.

[0044] exist Figures 6 to 10 , a second embodiment variant of the electric machine according to the invention is shown by way of example, which has a modified rotary joint. In the second embodiment variant, the first distributor sleeve 8A is connected or pressed to the second distributor sleeve 9A in a rotationally fixed manner. This means that the first distributor sleeve 8A and the second distributor sleeve 9A rotate together with the rotor shaft 22 and the rotor 3. Therefore, the two distributor sleeves 8A, 9A are sealed relative to the housing 2 of the bearing cover 6 by the sealing ring 21. This is in Figure 6 and Figure 7 In addition, from Figure 6 and Figure 7 The route of the cooling fluid transported by the rotation is shown by arrows.

[0045] The inflow channel 4 of the cooling fluid supply device on the bearing cover 6 is provided at the end of the first distributor sleeve 8A facing the bearing cover 6 by means of an annular gap space 11A on the outer periphery of the first distributor sleeve 8A. The annular gap space 11A of the first distributor sleeve 8A is connected in flow sense to the first radial hole 12A of the second distributor sleeve 9A via a planar gap portion 10A on the outer periphery of the first distributor sleeve 8A. The first radial hole 12A of the second distributor sleeve 9A is connected in flow sense to the inflow channel 14 of the cooling fluid circuit 7 of the rotor 3 via a first planar gap portion 13A on the outer periphery of the second distributor sleeve 9A. After flowing through the cooling fluid circuit 7, the cooling fluid reaches the outflow channel 15 of the cooling fluid circuit 7, which is connected in flow sense to the second radial hole 17A of the second distributor sleeve 9A via a second planar gap portion 16A on the outer periphery of the second distributor sleeve 9A. The second radial bore 17A of the second distributor sleeve 9A is fluidically connected to the central axial bore 18A of the first distributor sleeve 8A via the radial bore 19A of the first distributor sleeve 8A to allow the cooling fluid to be discharged from the first distributor sleeve 8A.

[0046] exist Figure 8 , a separate illustration of the first distributor sleeve 8A according to the second embodiment variant is shown. From this view, the annular gap space 11A of the inflow channel 4 of the cooling fluid supply device facing the bearing cover 6 can be seen on the outer periphery of the end of the first distributor sleeve 8A facing the bearing cover 6. The annular gap space 11A of the first distributor sleeve 8A is connected to the flat gap portion 10A on the outer periphery of the end of the first distributor sleeve 8A facing the rotor 3. In addition, on the opposite side in the circumferential direction of the distributor sleeve 8A, radial holes 19A of the first distributor sleeve 8A for discharging cooling fluid can be seen, which are connected in terms of flow to the axial holes 18A of the first distributor sleeve 8A, which are also shown.

[0047] exist Fig. 9 1 shows a second distributor sleeve 9A within the scope of a second embodiment variant. From this illustration, a first planar gap 13A can be seen on the outer circumference of the second distributor sleeve 9A, which is assigned to the first radial hole 12A of the second distributor sleeve 9A. The cooling fluid is discharged from the first radial hole 12A of the second distributor sleeve 9A to the first planar gap 13A of the second distributor sleeve 9A in order to be conveyed to the inflow channel 14 of the cooling fluid circuit 7 of the rotor 3.

[0048] From the basis Fig.10In the diagram (which shows the installation state of the first distributor sleeve 8A and the second distributor sleeve 9A), it can be seen that the first radial hole 12A of the second distributor sleeve 9A and the second radial hole 17A of the second distributor sleeve 9A are arranged oppositely in the circumferential direction of the second distributor sleeve 9A. In addition, the first plane gap portion 13A of the second distributor sleeve 9A and the second plane gap portion 16A of the second distributor sleeve 9A are also arranged oppositely in the circumferential direction of the second distributor sleeve 9A. In this way, the inlet and outlet of the cooling fluid are separated.

[0049] List of Reference Numerals

[0050] 1 Stator

[0051] 2 Housing

[0052] 3 Rotor

[0053] 4 Inlet channel for cooling fluid supply

[0054] 5 Outflow channel of the cooling fluid supply

[0055] 6 Bearing cap

[0056] 7 Cooling fluid circuit

[0057] 8, 8A First distributor sleeve

[0058] 9, 9A Second distributor sleeve

[0059] 10, 10A plane gap portion of the first distributor sleeve

[0060] 11, 11A Annular gap space

[0061] 12, 12A first radial hole of the second distributor sleeve

[0062] 13, 13A first plane gap portion of the second distributor sleeve

[0063] 14 Inlet channel for cooling fluid circuit

[0064] 15 Outflow channel for cooling fluid circuit

[0065] 16 Second plane gap

[0066] 17, 17A Second radial hole

[0067] 18, 18A axial hole

[0068] 19, 19A radial holes

[0069] 20 Diameter range

[0070] 21 Sealing ring

[0071] 22 Rotor shaft

[0072] 23 Drive shaft of electric machine

Claims

1. An electric machine for a vehicle, comprising a stator (1) located in a housing (2) and a rotor (3) rotatably supported in the housing (2) via a rotor shaft (22), wherein a cooling fluid supply device is provided, the cooling fluid supply device supplies cooling fluid to a closed cooling fluid circuit (7) of the rotor (3), wherein: A swivel joint with at least two channels for guiding the cooling fluid is provided between the cooling fluid supply device arranged outside the housing (2) and the cooling fluid circuit (7) of the rotor (3), wherein the swivel joint is realized by a first distributor sleeve (8, 8A) facing the housing (2) and a second distributor sleeve (9, 9A) connected to the rotor (3) in a rotationally fixed manner, wherein the first distributor sleeve (8, 8A) at least partially extends axially inside the second distributor sleeve (9, 9A), wherein the first distributor sleeve (8) is connected to the housing (2), and wherein the first distributor sleeve (8) is connected to the housing (2), and wherein the first distributor sleeve (8) is connected to the housing (2). The distributor sleeve (8) has a planar gap portion (10) on the outer circumference at the end facing the housing (2) to allow the cooling fluid from the cooling fluid supply device to enter, wherein the planar gap portion (10) is connected to the first radial hole (12) of the second distributor sleeve (9) in terms of flow via an annular gap space (11) on the outer circumference of the first distributor sleeve (8), and wherein the first radial hole (12) of the second distributor sleeve (9) is connected to the inlet channel (14) of the cooling fluid circuit (7) in terms of flow via a first planar gap portion (13) on the outer circumference of the second distributor sleeve (9).

2. The electric machine according to claim 1, characterized in that A cooling fluid introduction device for the cooling fluid circuit (7) is provided between the outer periphery of the first distributor sleeve (8, 8A) and the inner periphery of the second distributor sleeve (9, 9A), and an axial hole (18, 18A) passing through the center of the first distributor sleeve (8, 8A) is provided as a cooling fluid outlet device for a cooling fluid supply device.

3. The electric machine according to claim 1 or 2, characterized in that: The outflow channel (15) of the cooling fluid circuit (7) is connected in a flow sense to the second radial hole (17) of the second distributor sleeve (9) via a second planar gap portion (16) on the outer circumference of the second distributor sleeve (9), wherein the second radial hole (17) is connected in a flow sense to the central axial hole (18) of the first distributor sleeve (8), and wherein the axial hole (18) of the first distributor sleeve (8) is connected in a flow sense to the radial hole (19) so that the cooling fluid is discharged from the first distributor sleeve (8).

4. The electric machine according to claim 1 or 2, characterized in that: The clearance portion (10) of the first distributor sleeve (8) and the radial hole (19) of the first distributor sleeve (8) are arranged offset from each other in the circumferential direction of the first distributor sleeve (8).

5. The electric machine according to claim 1 or 2, characterized in that: The first radial holes (12) of the second distributor sleeve (9) and the second radial holes (17) of the second distributor sleeve (9) are arranged offset from each other in the axial direction.

6. The electric machine according to claim 1 or 2, characterized in that: The first distributor sleeve (8A) is connected to the second distributor sleeve (9A).

7. The electric machine according to claim 6, characterized in that The first distributor sleeve (8A) has an annular gap space (11A) on the outer periphery at the end facing the housing (2) to allow the cooling fluid from the cooling fluid supply device to enter, wherein the annular gap space (11A) on the outer periphery of the first distributor sleeve (8A) is connected to the first radial hole (12A) of the second distributor sleeve (9A) in a flow sense via a planar gap portion (10A) on the outer periphery of the first distributor sleeve (8A), and wherein the first radial hole (12A) is connected to the inlet channel (14) of the cooling fluid circuit (7) of the rotor (3) in a flow sense via a first planar gap portion (13A) on the outer periphery of the second distributor sleeve (9A).

8. The electric machine according to claim 6, characterized in that The outflow channel (15) of the cooling fluid circuit (7) of the rotor (3) is connected to the second radial hole (17A) of the second distributor sleeve (9A) in terms of flow via a second planar gap portion (16) on the outer periphery of the second distributor sleeve (9A), wherein the second radial hole (17A) of the second distributor sleeve (9A) is connected to the central axial hole (18A) of the first distributor sleeve (8A) in terms of flow via the radial hole (19A) of the first distributor sleeve (8A) so that the cooling fluid is discharged from the first distributor sleeve (8A).

9. The electric machine according to claim 7 or 8, characterized in that The first radial holes (12A) of the second distributor sleeve (9A) and the second radial holes (17A) of the second distributor sleeve (9A) are arranged opposite to each other in the circumferential direction of the second distributor sleeve (9A).

10. An electric machine according to claim 1 or 2, characterized in that The inflow channel (4) of the cooling fluid supply device and the outflow channel (5) of the cooling fluid supply device are integrated into the bearing cover (6) of the housing (2).

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