DE102019211559A1 - Electrical machine of a vehicle with a cooling fluid supply - Google Patents

Abstract

An electrical machine for a vehicle is proposed with a stator (1) in a housing (2) and a rotor (3) rotatably mounted in the housing (2) via a rotor shaft (22), a cooling fluid supply being provided which has a closed Cooling fluid circuit (7) of the rotor (3) is supplied with cooling fluid, an at least two-channel rotary feedthrough for a cooling fluid guide between the cooling fluid supply provided outside the housing (2) and the cooling fluid circuit (7) of the rotor (3).

Description

The present invention relates to an electrical machine of a vehicle with a stator in a housing and a rotor rotatably mounted in the housing via a rotor shaft, a cooling fluid supply being provided which supplies a closed cooling fluid circuit of the rotor with cooling fluid.

It is known from vehicle technology that the performance of an electrical machine and its service life are significantly influenced by the operating temperature that rises from the waste heat generated. Accordingly, it is crucial for optimal operation of an electrical machine that the heat generated is dissipated as effectively as possible from the housing of the electrical machine. A corresponding cooling fluid supply of a cooling circuit is provided for this.

From the pamphlet WO 87 037 48 A1 a cooling arrangement for a rotor of an electrical machine is known. In the case of the electrical machine, a hollow shaft of the rotor is supplied with cooling fluid via a cooling fluid supply in order to dissipate the heat.

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 dissipate the heat of the rotor, the end windings and the stator in an optimal manner. However, transporting the cooling fluid from the housing into the rotating rotor is structurally complex and costly.

The present invention is based on the object of proposing an electrical machine with a coolant supply which enables particularly effective and inexpensive cooling in the interior of the housing.

This object is achieved according to the invention by the features of patent claim 1. Advantageous and claimed further developments result from the subclaims and the description as well as the drawings.

Thus, an electrical machine of a vehicle with a stator in a housing and a rotor rotatably mounted in the housing via a rotor shaft is proposed, in which a cooling fluid supply is provided which supplies a closed cooling fluid circuit with cooling fluid. In order to achieve the best possible cooling, it is provided that an at least two-channel rotary feedthrough is provided for cooling fluid guidance or cooling fluid transport between the cooling fluid supply provided outside the housing and the cooling fluid circuit connected to the rotor.

By supplying the cooling fluid circuit connected to the rotor and the rotor shaft with the cooling fluid, the cooling fluid is practically guided through the rotor in order to be able to optimally dissipate the heat from the rotor, the rotor shaft, the end windings of the stator, the stator itself and other components. By using the two-channel rotary feedthrough, the cooling fluid is passed from the outside through the housing into the cooling fluid circuit of the rotor or the rotor shaft. Because a two-channel rotary feedthrough is provided, the cooling fluid inlet and cooling fluid outlet of the cooling fluid are routed separately in a structurally simple and cost-effective manner.

In the context of the invention, the rotary feedthrough is preferably implemented by a first distributor bushing facing the housing and a second distributor bushing connected to the rotor in a rotationally fixed manner, the first distributor bushing at least partially extending axially within the second distributor bushing or being arranged therein. In this way, the rotary feedthrough for the cooling fluid is implemented in a structurally simple manner using just two components. The cooling fluid passes through a contour formed by the two distributor bushings through the housing into the interior space to the cooling fluid circuit of the rotor and then back again through a separate contour from the housing to the cooling fluid supply.

Regardless of the design variant of the rotary feedthrough, a cooling fluid supply for the cooling fluid circuit is provided between the outer circumference of the first distributor bushing and the inner circumference of the second distributor bushing, while a central axial bore is provided through the first distributor bushing as a cooling fluid discharge for the cooling fluid supply. As a result, the provided rotary feedthrough realizes a separate supply and discharge of the cooling fluid.

In a first embodiment variant of the invention it can be provided, for example, that the first distributor socket is connected to the housing. For example, the first distributor socket can be pressed into the housing, preferably into a bearing cover of the housing. Other types of fastening that are also inexpensive and structurally simple are also possible. Accordingly, a stationarily arranged first distributor socket is provided which is axially introduced in sections into the interior of the second distributor socket, so that a seal between the rotating second distributor socket and the stationary first distributor socket is ensured. For sealing on the housing side only one seal is advantageously required.

When using a housing-fixed or stationary first distributor socket, the inlet of the cooling fluid supply is fixedly assigned to the facing end of the first distributor socket, so that the inlet of the cooling fluid supply is fluidly connected to the cooling fluid guide in the first distributor socket via a suitable clearance on the outer circumference of the first distributor socket. A flat or planar or a differently shaped release can be used as the release.

The clearance is fluidly connected to a free space provided on the circumference of the first socket in order to allow the inflowing cooling fluid to flow in the direction of the second distributor socket. A free space shaped like a ring or the like can be provided as the free space. The free space is in flow connection with a first radial bore of the second distributor bushing, so that the cooling fluid can flow through the first radial bore of the rotating second distributor bushing in order to be able to be fed to the inlet of the cooling fluid circuit of the rotor via a first flat clearance on the outer circumference of the second distributor bushing.

After flowing through the cooling fluid circuit inside or on the surface of the rotor and the rotor shaft, the cooling fluid is fed back to the two-channel rotary feedthrough, the drainage of the cooling fluid circuit being assigned to a second clearance on the outer circumference of the second distributor bushing, which has a second radial bore in the second distributor bushing is connected so that the fluid is fed into the central axial bore of the first stationary distributor bushing in order to finally be able to be fed from a radial bore of the first distributor bushing to the outlet of the cooling fluid supply on the housing side. In order to ensure a separation of the inlet and outlet of the cooling fluid in the second distributor socket in connection with the stationary first distributor socket, it is provided that the first radial bore of the second distributor socket and the second radial bore of the second distributor socket are axially offset from one another. Likewise, to separate the inlet and the outlet of the cooling fluid supply on the housing side, provision is made on the first distributor socket that the clearance and the radial bore at the end of the first distributor socket facing the housing are offset from one another over the circumference.

A second variant embodiment of the invention provides that in the proposed rotary feedthrough the first distributor socket is connected to the second distributor socket. Because the second distributor bushing is connected to the rotor in a rotationally fixed manner, in this second embodiment the first distributor bushing, like the second distributor bushing, is rotatably supported with the rotor shaft in the housing. Accordingly, when the rotation is transmitted between the inlet or outlet of the cooling fluid supply on the housing side, a corresponding contour is to be provided on the facing end of the first rotating distributor socket.

As a particularly structurally simple contour, a free space provided on the outer circumference, preferably an annular free space, is provided at an end facing the inlet of the cooling fluid supply. As a result, cooling fluid can flow into the annular free space of the first rotating distributor socket through the stationary inlet fixed to the housing. The annular free space is fluidly connected to a flat clearance on the outer circumference of the first distributor socket, so that the cooling fluid that has flowed in is guided further in the direction of the second distributor socket, which is preferably pressed with the first distributor socket.

The areal clearance on the circumference of the first distributor socket is assigned to a first radial bore of the second distributor socket. Since the first distributor bushing and the second distributor bushing are connected to one another in a rotationally fixed manner, the cooling fluid can be guided from the flat exposure through the first radial bore into a first flat exposure on the outer circumference of the second distributor bushing to an inlet channel of the cooling fluid circuit of the rotor.

After flowing through the cooling fluid circuit, the cooling fluid is led back to the drainage channel of the cooling fluid circuit, which is assigned to a second areal clearance on the outer circumference of the second distributor socket, which in turn is fluidly connected to a second radial bore of the second distributor socket. The second radial bore of the second distributor bushing is aligned congruently with a radial bore of the first distributor bushing, which in turn is flow-connected to the central axial bore of the first distributor bushing for the cooling fluid to exit from the first distributor bushing.

Since no relative movement is possible with the first distributor bushing and the second distributor bushing, which are connected to one another in a rotationally fixed manner, the first radial bore and the second radial bore of the second distributor bushing can advantageously be arranged opposite one another on the circumference.

Another advantage of the present invention is that the cooling fluid inlet channel and the cooling fluid drain channel of the cooling fluid supply on the housing side are arranged on an axial side of the electrical machine. This is achieved in that both an inlet channel and an outlet channel for the cooling fluid supply are integrated in a bearing cover of the housing. This creates a self-contained cooling system with hydraulic connections for the inlet channel and the outlet channel of the cooling supply.

• 1 eine geschnittene Teilansicht einer ersten Ausführungsvariante einer elektrischen Maschine mit einer Drehdurchführung zum strömungsmäßigen Verbinden einer gehäuseseitigen Kühlfluidversorgung mit einem Kühlfluidkreislauf eines Rotors;
• 2 eine weitere Schnittansicht der elektrischen Maschine in einer veränderten Schnittperspektive;
• 3 eine Einzelteilansicht einer ersten stationären Verteilerbuchse der Drehdurchführung gemäß der ersten in den 1 und 2 dargestellten Ausführungsvariante der elektrischen Maschine;
• 4 eine Einzelteilansicht einer zweiten Verteilerbuchse der Drehdurchführung gemäß der ersten in den 1 und 2 dargestellten Ausführungsvariante der elektrischen Maschine;
• 5 eine geschnittene Ansicht der ersten Verteilerbuchse und der zweiten Verteilerbuchse im zusammengebauten Zustand gemäß der ersten in den 1 und 2 dargestellten Ausführungsvariante der elektrischen Maschine;
• 6 eine Teilansicht einer zweiten Ausführungsvariante der elektrischen Maschine mit der Drehdurchführung zum strömungsmäßigen Verbinden der gehäuseseitigen Kühlfluidversorgung mit dem Kühlfluidkreislauf des Rotors;
• 7 eine weitere Schnittansicht gemäß 6 mit einer veränderten Schnittperspektive;
• 8 eine Einzelteilansicht der ersten Verteilerbuchse der Drehdurchführung gemäß der zweiten in den 6 und 7 dargestellten Ausführungsvariante der elektrischen Maschine;
• 9 eine Einzelteilansicht der zweiten Verteilerbuchse der Drehdurchführung gemäß der zweiten in den 6 und 7 dargestellten Ausführungsvariante der elektrischen Maschine; und
• 10 eine geschnittene Ansicht der ersten Verteilerbuchse und der zweiten Verteilerbuchse im eingebauten Zustand gemäß der zweiten in den 6 und 7 dargestellten Ausführungsvariante der elektrischen Maschine.

The present invention is further explained below with reference to the drawings. Show it:

• 1 a sectional partial view of a first embodiment variant of an electrical machine with a rotary leadthrough for fluidly connecting a housing-side cooling fluid supply to a cooling fluid circuit of a rotor;
• 2 a further sectional view of the electrical machine in a modified sectional perspective;
• 3 a detail view of a first stationary distributor socket of the rotary leadthrough according to the first in FIG 1 and 2 illustrated embodiment of the electrical machine;
• 4th a detail view of a second distributor socket of the rotary union according to the first in FIG 1 and 2 illustrated embodiment of the electrical machine;
• 5 a sectional view of the first distributor socket and the second distributor socket in the assembled state according to the first in FIG 1 and 2 illustrated embodiment of the electrical machine;
• 6 a partial view of a second embodiment variant of the electrical machine with the rotary leadthrough for fluidly connecting the cooling fluid supply on the housing side to the cooling fluid circuit of the rotor;
• 7th a further sectional view according to 6 with a different perspective;
• 8th a detail view of the first distributor socket of the rotary union according to the second in FIG 6 and 7th illustrated embodiment of the electrical machine;
• 9 a detail view of the second distributor socket of the rotary union according to the second in FIG 6 and 7th illustrated embodiment of the electrical machine; and
• 10 a sectional view of the first distributor socket and the second distributor socket in the installed state according to the second in the 6 and 7th illustrated embodiment of the electrical machine.

In the 1 to 5 is a first variant of an electrical machine according to the invention of a vehicle with a rotary leadthrough for the flow connection of a housing-side cooling fluid supply with a cooling fluid circuit 7th of a rotor 3 exemplified, while the 6 to 10 represent an example of a second variant of the electrical machine with the modified rotary feedthrough.

Regardless of the respective design variants, the electrical machine comprises a stator 1 in one housing 2 and that via a rotor shaft 22nd rotatable in the housing 2 mounted rotor 3 . A stationary cooling fluid supply that is fixed to the housing or on the side of the housing is via a cooling fluid inlet channel 4th and a cooling fluid drainage channel 5 hydraulically to a bearing cover 6 of the housing 2 connected and integrated in this advantageously.

For the cooling fluid supply there is a two-channel rotary leadthrough for the cooling fluid between the cooling fluid supply provided outside the housing and one with the rotor shaft 22nd and the rotor 3 connected cooling fluid circuit 7th intended. The cooling fluid used can preferably be water or a water-glycol mixture or other fluids, such as oil. The rotor shaft 22nd is with a drive shaft 23 connected to the electric machine for torque transmission.

With the two-channel rotary feedthrough, a separate cooling fluid supply and a separate cooling fluid discharge are implemented. The rotary leadthrough includes a first distributor socket 8th , 8A and a second distribution socket 9 , 9A , with the second distributor socket 9 , 9A with the rotor 3 Is rotatably connected and can serve as an additional function as a sensor wheel for a speed sensor of the electrical machine.

The first distribution socket 8th , 8A is the bearing cap 6 of the housing 2 facing, the first distribution socket 8th , 8A at least in sections axially within the rotating second distributor bushing 9 , 9A is arranged. The first distribution socket 8th , 8A and the second distributor socket 9 , 9A of the rotary feedthrough form a cooling fluid guide contour for the cooling fluid guide in the assembled state. Between the outer circumference of the first distributor socket 8th , 8A and the inner periphery of the second distribution socket 9 , 9A is a Cooling fluid supply for the cooling fluid circuit 7th provided while a central axial bore 18th , 18A through the first distributor socket 8th , 8A is provided as a cooling fluid discharge for the cooling fluid supply.

In the context of the first variant embodiment of the electrical machine according to the invention, it is provided in the rotary feedthrough that the first distributor socket 8th with the case 2 is fixedly connected. Hence the first distribution socket 8th arranged stationary, while the second distributor socket 9 rotatable in the housing 2 with the rotor shaft 22nd and the rotor 3 is stored. The first distributor socket is in the installed state 8th axially within the second distributor socket 9 arranged sealingly.

In order to implement a cooling fluid guide within the scope of the first variant embodiment with the rotary leadthrough in the electrical machine, it is provided that the first distributor socket 8th on one of the housing 2 or the bearing cover 6 facing end a flat release 10 on the outer circumference for the entry of the cooling fluid from the inlet channel 4th having the cooling fluid supply. The first stationary distribution socket 8th is in the bearing cap 6 of the housing 2 pressed in sealing. From the 1 and 2 the course of the cooling fluid through the transmission of rotation is indicated by arrows.

The extensive release 10 is about an annular space 11 on the outer circumference of the first distributor socket 8th with a first radial hole 12 the second distributor socket 9 connected in terms of flow. The first radial hole 12 is about a first area exemption 13 on the outer circumference of the second distributor socket 9 with an inlet channel 14th of the cooling fluid circuit 7th of the rotor 3 connected in terms of flow. As a result, the supplied cooling fluid can through the rotor 3 or on the jacket area of the rotor 3 and the rotor shaft 22nd flow along to the heat from the rotor 3 and to discharge the surrounding components of the electrical machine accordingly.

A drainage channel 15th of the cooling fluid circuit 7th of the rotor 3 is about a second area free space 16 on the outer circumference of the second distributor socket 9 with a second radial hole 17th the second distributor socket 9 connected in terms of flow. The second radial hole 17th is with a central axial bore 18th the first distribution socket 8th connected in terms of flow. The central axial bore 18th is in turn with a radial bore 19th the first distribution socket 8th to exit the cooling fluid from the first distributor socket 8th connected in terms of flow. The radial bore is used for this 19th the first distribution socket 8th with the drainage channel 5 the cooling fluid supply in the bearing cover 6 for example connected via a hydraulic connection.

In particular from the individual views according to 3 and 4th and from the sectional view according to 5 of the two assembled distribution sockets 8th , 9 the construction of the individual components can be seen.

For example shows 3 the detail view of the first distribution socket 8th , in which the areal exemption 10 and the radial bore 19th the first distribution socket 8th over the circumference of the first distributor socket 8th are arranged offset to one another. In this way, a separation of the inlet and outlet of the cooling fluid is ensured. The exemption 10 is fluidic with the annular clearance 11 on the outer circumference of the first distributor socket 8th connected. Around the ring-shaped space 11 on that of the rotor 3 facing end of the first distributor socket 8th to be limited is a web or an enlarged diameter range 20th at the first distributor socket 8th intended. There is also the centrally arranged axial bore 18th with the radial bore 19th on the bearing cover 6 facing end of the first distributor socket 8th fluidly connected, which in 3 can be seen.

In 4th Figure 4 is a partial view of the second distribution box 9 shown showing the first distribution socket 8th receives axially in the installed state, as shown in 5 is shown. The second distributor socket 9 shows the first areal exposure 13 on the outer circumference, which corresponds to the in 2 shown inlet channel 14th of the cooling fluid circuit 7th of the rotor 3 is fluidly connected. On the bearing cover 6 facing end of the first exemption 13 is the first radial hole 12 with the annular space arranged inside 11 the first distribution socket 8th is fluidly connected. In particular from the representation according to 5 it can be seen that the first radial hole 12 and the second radial bore 17th the second distributor socket 9 are arranged axially offset from one another. This is necessary to allow the cooling fluid to drain through the central axial bore 18th to separate from the inlet of the cooling fluid.

In the 6 to 10 a second variant embodiment of the electrical machine according to the invention with a modified rotary leadthrough is shown as an example. In the second variant, the first distributor socket is 8A with the second distributor socket 9A non-rotatably connected or pressed. This means that the first distribution socket 8A and the second distributor socket 9A with the rotor shaft 22nd and the rotor 3 rotate with it. As a result, the two distributor sockets are sealed 8A , 9A together via a sealing ring 21st opposite the bearing cap 6 of the housing 2 . This is in the 6 and 7th indicated. Furthermore, from the 6 and 7th the course of the cooling fluid through the rotary transmission indicated by arrows.

The inlet channel 4th the cooling fluid supply on the bearing cover 6 is with an annular clearance 11A on the outer circumference of the first distributor socket 8A on the bearing cover 6 facing end of the first distributor socket 8A intended. The ring-shaped space 11A the first distribution socket 8A is about a flat release 10A on the outer circumference of the first distributor socket 8A with a first radial hole 12A the second distributor socket 9A connected in terms of flow. The first radial hole 12A the second distributor socket 9A is about a first area exemption 13A on the outer circumference of the second distributor socket 9A with the inlet channel 14th of the cooling fluid circuit 7th of the rotor 3 connected in terms of flow. After flowing through the cooling fluid circuit 7th the cooling fluid reaches the drainage channel 15th of the cooling fluid circuit 7th , which has a second flat exposure 16A on the outer circumference of the second distributor socket 9A with a second radial hole 17A the second distributor socket 9A is fluidly connected. The second radial hole 17A the second distributor socket 9A is via a radial hole 19A the first distribution socket 8A with the central axial bore 18A the first distribution socket 8A to exit the cooling fluid from the first distributor socket 8A connected in terms of flow.

In 8th is a single representation of the first distributor socket 8A shown according to the second embodiment. From this point of view it is the inlet channel 4th the cooling fluid supply to the bearing cover 6 facing annular space 11A on the outer circumference of the bearing cover 6 facing end of the first distributor socket 8A to recognize. The ring-shaped space 11A the first distribution socket 8A is with the areal exemption 10A on the outer circumference of the rotor 3 facing end of the first distributor socket 8A connected. Furthermore, on the opposite side on the circumference of the distributor socket 8A the radial bore 19A the first distribution socket 8A to the exit of the cooling fluid can be seen, the flow with the axial bore also shown 18A the first distribution socket 8A connected is.

In 9 is the second distributor socket 9A shown in the context of the second variant. From this illustration is the first two-dimensional exemption 13A on the outer circumference of the second distributor socket 9A can be seen, that of the first radial hole 12A the second distributor socket 9A assigned. From the first radial hole 12A the second distributor socket 9A the cooling fluid enters the first areal clearance 13A the second distributor socket 9A off to in the inlet channel 14th of the cooling fluid circuit 7th of the rotor 3 to be fed.

From the representation according to 10 showing the installation state of the first distributor socket 8A and second distributor socket 9A shows, it can be seen that the first radial bore 12A the second distributor socket 9A and the second radial bore 17A the second distributor socket 9A on the circumference of the second distributor socket 9A are arranged opposite one another. In addition, there are also the first areal exemption 13A the second distributor socket 9A and the second flat exposure 16A of the second distributor socket 9A on the circumference of the second distributor socket 9A arranged opposite one another. In this way, the inlet and outlet of the cooling fluid are separated.

List of reference symbols

1

stator

2

casing

3

rotor

4th

Inlet channel of the cooling fluid supply

5

Drain channel of the cooling fluid supply

6th

Bearing cap

7th

Cooling fluid circuit

8, 8A

first distribution socket

9, 9A

second distributor socket

10, 10A

Areal exposure of the first distributor socket

11, 11A

annular free space

12, 12A

first radial bore of the second distributor socket

13, 13A

first areal exposure of the second distributor socket

14th

Inlet channel of the cooling fluid circuit

15th

Drain channel of the cooling fluid circuit

16

second areal exposure

17, 17A

second radial hole

18, 18A

Axial bore

19, 19A

Radial bore

20th

Diameter range

21st

Sealing ring

22nd

Rotor shaft

23

Drive shaft of the electric machine

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 8703748 A1 [0003]

Claims (13)

Electrical machine of a vehicle, with a stator (1) in a housing (2) and a rotor (3) rotatably mounted in the housing (2) via a rotor shaft (22), a cooling fluid supply being provided which forms a closed cooling fluid circuit (7 ) of the rotor (3) is supplied with cooling fluid, characterized in that an at least two-channel rotary leadthrough is provided for a cooling fluid supply between the cooling fluid supply provided outside the housing (2) and the cooling fluid circuit (7) of the rotor (3). Electric machine after Claim 1 , characterized in that the rotary feedthrough is realized by a first distributor bushing (8, 8A) facing the housing (2) and a second distributor bushing (9, 9A) non-rotatably connected to the rotor (3), the first distributor bushing (8, 8A) ) extends axially at least in sections within the second distributor socket (9, 9A). Electric machine after Claim 2 , characterized in that a cooling fluid supply for the cooling fluid circuit (7) is provided between the outer circumference of the first distributor socket (8, 8A) and the inner circumference of the second distributor socket (9, 9A) and that a central axial bore (18, 18A) through the first Distributor socket (8, 8A) is provided as a cooling fluid discharge for the cooling fluid supply. Electric machine after Claim 2 or 3 , characterized in that the first distributor socket (8) is connected to the housing (2). Electric machine after Claim 4 , characterized in that the first distributor bushing (8) at one end facing the housing (2) has a flat free space (10) on the outer circumference for the cooling fluid to enter from the cooling fluid supply, the flat free space (10) having an annular free space (11 ) on the outer circumference of the first distributor bushing (8) is fluidly connected to a first radial bore (12) of the second distributor bushing (9), and the first radial bore (12) of the second distributor bushing (9) via a first flat clearance (13) on the outer circumference of the second distributor socket (9) is fluidly connected to an inlet channel (14) of the cooling fluid circuit (7). Electric machine after Claim 4 or 5 , characterized in that a drain channel (15) of the cooling fluid circuit (7) is fluidly connected to a second radial bore (17) of the second distributor bushing (9) via a second areal clearance (16) on the outer circumference of the second distributor bushing (9), the second radial bore (17) is fluidly connected to the central axial bore (18) of the first distributor bushing (8) and wherein the axial bore (18) is connected to a radial bore (19) of the first distributor bushing (8) for the cooling fluid to exit from the first distributor bushing (8) ) is fluidly connected. Electric machine after Claim 5 or 6 , characterized in that the clearance (10) of the first distributor socket (8) and the radial bore (19) of the first distributor socket (8) are arranged offset to one another over the circumference of the first distributor socket (8). Electric machine according to one of the Claims 5 to 7th , characterized in that the first radial bore (12) of the second distributor bushing (9) and the second radial bore (17) of the second distributor bushing (9) are arranged axially offset from one another. Electric machine after Claim 2 or 3 , characterized in that the first distributor socket (8A) is connected to the second distributor socket (9A). Electric machine after Claim 9 , characterized in that the first distributor socket (8A) has, at an end facing the housing (2), an annular free space (11A) on the outer circumference for the entry of the cooling fluid from the cooling fluid supply, the annular free space (11A) on the outer circumference of the first distributor socket ( 8A) is fluidly connected to a first radial bore (12A) of the second distributor socket (9A) via a flat exposure (10A) on the outer circumference of the first distributor socket (8A) and the first radial bore (12A) via a first flat exposure (13A) on the The outer circumference of the second distributor bushing (9A) is fluidly connected to an inlet duct (14) of the cooling fluid circuit (7) of the rotor (3). Electric machine after Claim 9 or 10 , characterized in that a discharge channel (15) of the cooling fluid circuit (7) of the rotor (3) via a second flat clearance (16) on the outer circumference of the second distributor bushing (9A) with a second radial bore (17A) of the second distributor bushing (9A) is connected, the second radial bore (17A) of the second distributor bushing (9A) via a radial bore (19A) of the first distributor bushing (8A) with the central axial bore (18A) of the first distributor bushing (8A) for the cooling fluid to exit the first distributor bushing ( 8A) is fluidly connected. Electric machine according to one of the Claims 9 to 11 , characterized in that the first radial bore (12A) of the second Distributor socket (9A) and the second radial bore (17A) of the second distributor socket (9A) are arranged opposite one another on the circumference of the second distributor socket (9A). Electrical machine according to one of the preceding claims, characterized in that the inlet channel (4) of the cooling fluid supply and the outlet channel (5) of the cooling fluid supply are integrated in a bearing cover (6) of the housing (2).

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