Wheel hub drive device for a motor vehicle, and motor vehicle

Abstract

The invention relates to a wheel hub drive device (10) for a motor vehicle, having a wheel carrier (18), a wheel bearing device (20) which has at least one first wheel bearing (RL1), a wheel disc (14) which is rotatably mounted on the wheel carrier (18) by means of the wheel bearing (20), an electric machine (24) which has a stator (28) and a rotor (26), and a stator carrier (36), by means of which the stator (28) is rotationally fixed to the wheel carrier (18). The stator carrier (36) has a first cylinder section (Z1), which overlaps axially with the stator (28), and a second cylinder section (Z2), which is arranged radially within the first cylinder section (Z1) and is axially offset to the stator (28), The second cylinder section (Z2) has a radially inner first sleeve (H1) made of a first metal material and a radially outer second sleeve (H2) made of a second material that differs from the first material.

Description

[0001] Mercedes-Benz Group AG

[0002] Wheel hub drive for a motor vehicle and motor vehicle

[0003] The invention relates to a wheel hub drive for a motor vehicle, in particular for a motor vehicle, according to the preamble of patent claim 1. Furthermore, the invention relates to a motor vehicle with at least one such wheel hub drive.

[0004] WO 2022 / 096504 A1 discloses a wheel system for a vehicle, comprising a stator, a rotor and a pivot bearing.

[0005] WO 96 / 22 895 A1 discloses a wheel hub drive with an electric machine, wherein a stator carrier of the electric machine has two axially offset cylindrical sections. DE 102014209 176 A1 and US 2020 / 0238 817 A1 disclose wheel hub drives in which a stator carrier is formed partially from plastic or from a non-electrically conductive material, respectively. A stator carrier of a wheel hub drive shown in DE 102009 035 176 A1 has a conical section. CN 1 02 390253 A discloses an arrangement of busbars on and in a stator carrier of a wheel hub drive.

[0006] The object of the present invention is to provide a wheel hub drive for a motor vehicle and a motor vehicle with at least one such wheel hub drive, so that a particularly weight- and space-efficient design of the wheel hub drive can be realized.

[0007] This object is achieved by a wheel hub drive having the features of patent claim 1 and by a motor vehicle having the features of patent claim 5. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0008] A first aspect of the invention relates to a wheel hub drive, also referred to as a wheel hub drive device or wheel hub drive unit, for a motor vehicle, also simply referred to as a vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car. This means that the motor vehicle, in its fully manufactured state, has the wheel hub drive and can be driven by means of the wheel hub drive, in particular purely electrically. The wheel hub drive is preferably an electric wheel hub drive, by means of which the motor vehicle can be driven, in particular purely electrically. For example, in its fully manufactured state, the motor vehicle has at least or exactly two vehicle axles, arranged one behind the other and thus consecutively in the longitudinal direction of the motor vehicle, also simply referred to as axles.The respective vehicle axle of the motor vehicle has at least or exactly two respective vehicle wheels, also simply referred to as wheels, wherein the respective vehicle wheels of the respective vehicle axle are arranged on opposite sides of the motor vehicle in the transverse direction of the motor vehicle. The vehicle wheels of the motor vehicle are ground contact elements by means of which the motor vehicle can be or is supported downwards on a ground in the vertical direction of the motor vehicle. If the motor vehicle, the interior of which is also referred to as the passenger cell or passenger compartment is formed, for example, by a motor vehicle structure designed in particular as a self-supporting body, is driven along the ground while the motor vehicle is supported downwards on the ground in the vertical direction of the vehicle via the ground contact elements, the ground contact elements roll, in particular directly, on the ground.The wheel hub drive is also referred to as the first wheel hub drive. When reference is made above and below to the wheel hub drive, this refers, unless otherwise stated, to the first wheel hub drive. For example, the wheel hub drive comprises, in particular, a first of the vehicle wheels of one of the vehicle axles. When reference is made above and below to the vehicle wheel, this refers, unless otherwise stated, to the first vehicle wheel. Thus, the first vehicle wheel can be driven, in particular purely electrically, by means of the first wheel hub drive.For example, in its fully manufactured state, the motor vehicle has a second wheel hub drive provided in addition to the first wheel hub drive, by means of which, in particular precisely, a second of the vehicle wheels of the motor vehicle can be driven, in particular purely electrically, wherein it is conceivable that the second wheel hub drive comprises the second vehicle gear. Preferably, the first vehicle gear and the second vehicle gear are the vehicle wheels of the same vehicle axle. When reference is made above and below to the vehicle gear, this refers to the first vehicle gear unless otherwise stated. The above and following statements regarding the first wheel hub drive and the first vehicle gear can readily be applied to the second wheel hub drive and the second vehicle gear, and vice versa.

[0009] The wheel hub drive has a wheel carrier and a wheel bearing device, wherein the wheel bearing device has at least a first wheel bearing. The first wheel bearing is thus, for example, a first partial bearing of the wheel bearing device. Preferably, the first wheel bearing, in particular the wheel bearing device as a whole, is designed as a rolling bearing. A wheel disc is rotatably mounted on the wheel carrier by means of the wheel bearing device and via the wheel bearing device. The wheel disc is, for example, a component of the first vehicle wheel, wherein the wheel hub drive comprises the wheel disc. At least, for example, the vehicle wheel of the motor vehicle is rotatably mounted on the wheel carrier via the wheel bearing device by means of the wheel bearing device. In particular, the wheel disc and thus, for example, the first vehicle wheel are rotatably mounted about a wheel rotation axis relative to the wheel carrier via the wheel bearing device.The vehicle has, for example, the wheel disc and a rim that is connected, in particular permanently and non-rotatably, to the wheel disc. Thus, the rim and the wheel disc can be components of the first vehicle wheel. In principle, it would be conceivable for the rim and the wheel disc to be formed separately from one another and, in particular permanently and non-rotatably connected to one another, or the wheel disc and the rim to be formed integrally with one another, i.e., formed from a single piece and thus, in particular permanently and non-rotatably connected to one another. In particular, for example, the rim and the wheel disc form a wheel unit, which can, for example, be the first vehicle wheel, or the wheel unit is a component of the first vehicle wheel. For example, a tire, in particular of the first vehicle wheel and made of rubber, is attached to the rim, so that the tire is, so to speak, mounted on the rim.In particular, when the vehicle's wheel rolls on the ground, the tire rolls, especially directly, on the ground.

[0010] The wheel hub drive also has an electric machine which has a stator and a rotor. The rotor can be driven by means of the stator and is thus rotatable about a machine axis of rotation relative to the stator. The rotor is preferably arranged coaxially to the wheel bearing device so that the machine axis of rotation preferably coincides with the wheel axis of rotation. The wheel axis of rotation is also referred to as the main axis of rotation of the wheel hub drive. In particular, by driving the rotor by means of the rotor, the wheel disc and thus in particular via the wheel disc the vehicle wheel can be driven, in particular purely electrically. The wheel hub drive also has a stator carrier by means of which the stator is held rotationally fixed to the wheel carrier. In particular, it is provided that the stator is formed separately from the stator carrier and, in particular permanently, is rotationally connected to the stator carrier.For example, the stator carrier is connected, in particular permanently, in a rotationally fixed manner to the wheel carrier. It can be provided that the stator carrier is formed separately from the wheel carrier and is connected, in particular permanently, in a rotationally fixed manner to the wheel carrier. In particular, the stator is or comprises, for example, a laminated core. Alternatively or additionally, the stator can comprise at least one or more magnets, in particular permanent magnets, which are held, for example, on the laminated core and thus supported by the laminated core. Alternatively or additionally, the stator can, for example, have at least one winding, also referred to as a stator winding, which is held on the laminated core and thus supported by the laminated core.In particular, the stator, in particular in contrast to the stator carrier, is a magnetically active element by means of which, for example, a magnetic flux is to be guided, which can be generated by the electric machine, for example, during operation of the electric machine, in order to drive the wheel disc or the vehicle.

[0011] Preferably, the electrical machine is a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and most preferably amounts to several hundred volts.

[0012] The stator carrier has a first cylinder section arranged axially overlapping the stator and a second cylinder section arranged radially inside the first cylinder section and axially offset from the stator. It is preferably provided that the respective cylinder section is cylindrical at least on the outer wall side and preferably also on the inner circumference side and thus has the shape of a particularly right circular cylinder. At least, for example, it is provided that the respective cylinder section has an outer circumferential surface facing outwards in the radial direction of the wheel hub drive, which is cylindrical and thus has the shape of a particularly right circular cylinder.Furthermore, it is conceivable for the respective cylinder section to have an inner circumferential surface facing inward in the radial direction of the wheel hub drive, which is preferably cylindrical and thus has the shape of a particularly right circular cylinder. The radial direction of the wheel hub drive runs perpendicular to the axial direction of the wheel hub drive, whose axial direction coincides with the main axis of rotation (wheel axis of rotation).

[0013] In order to be able to realize a design of the wheel hub drive that is particularly space- and weight-efficient, it is provided in a manner known per se that the second cylinder section has a radially inner first sleeve made of a metallic first material and a radially outer second sleeve, which is made of a second material that is different from the first material. Preferably, the first sleeve is arranged at least partially radially and axially within the second sleeve, so that it is preferably provided that the first sleeve is arranged at least partially axially and radially overlapping the second sleeve. This makes it possible to represent a particularly advantageous and compact design of the wheel hub drive.

[0014] In order to be able to realize a wheel hub drive that is particularly weight- and space-efficient, the invention provides that the stator carrier has a conical section which is arranged axially overlapping the first wheel bearing, wherein the second cylindrical section is arranged axially, i.e. viewed in the axial direction of the wheel hub drive, at least partially, in particular at least predominantly and thus at least more than half or completely, between the conical section and the wheel carrier. In particular, the conical section is such a region, part or section of the stator carrier whose region, part or section is conical at least on the outer circumference and preferably also on the inner circumference and has the shape of a cone or truncated cone.It is preferably provided that the conical section, particularly when viewed in the axial direction of the wheel hub drive, adjoins the first cylinder section and the second cylinder section directly, i.e. directly, in particular in such a way that the conical section is arranged axially, i.e. in the axial direction of the wheel hub drive, between the first cylinder section and the second cylinder section. This means that in the axial direction of the wheel hub drive, no other, further region, part or section of the stator carrier is arranged between the respective cylinder section and conical section. For example, the conical section extends from the first cylinder section, i.e. starting from the first cylinder section, radially inwards towards the wheel bearing device and thus towards the wheel rotation axis and axially towards the wheel carrier.In other words, the conical section extends in a direction of extension that coincides with the axial direction of the wheel hub drive or runs parallel to the axial direction of the wheel hub drive and runs from the first cylinder section towards the wheel carrier, starting from the first cylinder section in a radially inward direction in the direction of the wheel bearing device and thus the wheel rotation axis. The conical section thus tapers from the first cylinder section towards the wheel carrier. Conversely, the conical section widens from the wheel carrier towards the first cylinder section. This allows for a particularly compact design.

[0015] Since the second cylinder section is arranged radially, i.e., within the first cylinder section in the radial direction of the wheel hub drive, the first cylinder section is a radially outer first cylinder section, i.e., in the radial direction of the wheel hub drive, while the second cylinder section is a radially inner second cylinder section of the stator carrier, i.e., in the radial direction of the wheel hub drive. The radial direction of the wheel hub drive, whose axial direction coincides with the wheel rotation axis (main rotation axis), runs perpendicular to the axial direction of the wheel hub drive.

[0016] In the context of the present disclosure, the feature “radially overlapping” is to be understood as follows: Two elements, in particular those that are at least substantially rotationally symmetrical, are arranged radially, in particular overlapping one another, in particular with respect to a common axis that runs, for example, in the radial direction of the wheel hub drive and / or in the radial direction of the wheel hub drive, if they are each arranged at least partially in a region of the same radial coordinates, in particular the same angular coordinates. The term “radial” refers to the radial direction of the wheel hub drive. In other words, the term “radial” means the radial direction of the wheel hub drive. When reference is made above and below to the radial direction, this means the radial direction of the wheel hub drive, unless otherwise stated.

[0017] The feature “axially overlapping” is to be understood as follows: Two elements, such as the stator and the first cylinder section, are arranged axially overlapping, in particular with respect to one another, with respect to a common axis, in particular running in the axial direction of the wheel hub drive, and / or in the axial direction of the wheel hub drive, if they are each arranged at least partially in a region of the same axial coordinates. In the context of the present disclosure, the term “axial” is to be understood as the axial direction of the wheel hub drive. In other words, the term “axial” means the axial direction of the wheel hub drive. Expressed again in other words, “axial” refers to the axial direction of the wheel hub drive, and “radial” refers to the radial direction of the wheel hub drive.When reference is made to the axial direction above and below, this refers to the axial direction of the wheel hub drive, unless otherwise stated.

[0018] In the context of the present disclosure, the feature that a first component is arranged radially within a second component is to be understood as meaning that the first component is arranged in a region of smaller radii than the second component, in particular with respect to the wheel rotation axis (main rotation axis). Furthermore, the feature that a first component is arranged axially within a second component is to be understood as meaning that in the installed position of the wheel hub drive, which assumes its installed position in the fully manufactured state of the motor vehicle having the wheel hub drive, and in particular with respect to straight-ahead travel of the motor vehicle, that is to say in particular when a steering system of the motor vehicle is set to cause the motor vehicle to travel straight ahead, the first component, which is arranged axially within the second component,is arranged on one side of the second component towards a centre of the motor vehicle, also referred to as the vehicle centre, thus the first component is arranged on a side of the second component pointing towards the centre of the motor vehicle, so that the first component is arranged further inwards, i.e. closer to the centre of the motor vehicle, than the second component, particularly when viewed in the transverse direction of the motor vehicle.

[0019] In the context of the present disclosure, the feature that two components are connected to one another in a rotationally fixed manner is to be understood as meaning that the components connected to one another in a rotationally fixed manner are arranged coaxially to one another and, in particular when the components are driven, rotate together or simultaneously about a component rotation axis common to the components, such as the main rotation axis, at the same angular velocity, in particular relative to a reference element, such as the wheel carrier. In other words, two elements are connected to one another in a rotationally fixed manner if they are arranged coaxially to one another, in particular with respect to their component rotation axis or with respect to a rotational symmetry axis, and if they are connected to one another in such a way that they always rotate at the same angular velocity.An element is connected to a housing in a rotationally fixed manner if it cannot be rotated relative to the housing. Thus, an element is connected to a wheel carrier in a rotationally fixed manner if it cannot be rotated relative to the wheel carrier.

[0020] The feature that two components are connected or coupled to one another in a torque-transmitting manner is to be understood as meaning that the components are coupled or connected to one another in such a way that torque can be transmitted between the components. If the components are connected or coupled to one another in a torque-transmitting manner, the components are also connected or coupled to one another in a torque-transmitting manner. Two components connected to one another in a torque-transmitting manner can thus be connected to one another in a torque-transmitting manner. Furthermore, it is conceivable that two components connected to one another in a torque-transmitting manner are connected to one another in a torque-transmitting manner via an intermediate transmission unit, so that torque can be transmitted between the components via the transmission unit, while the components are connected to one another in a torque-transmitting manner, although the components can be rotatable relative to one another.

[0021] The feature that two components are permanently connected or coupled to one another in a torque-transmitting manner does not mean that a switching element is provided that can be switched between a coupling state that connects or couples the components to one another in a torque-transmitting manner and a decoupling state in which no torque can be transmitted between the components via the switching element. Rather, the components are always and therefore permanently torque-transmitting, i.e., connected or coupled to one another in such a way that torque can be transmitted between the components. Thus, for example, one of the components can be driven by the other component, or vice versa.

[0022] In particular, the feature that two components are permanently connected or coupled to one another in a rotationally stable manner is to be understood as meaning that a switching element is not provided which can be switched between a coupling state which connects or couples the components to one another in a rotationally stable manner and a decoupling state in which the components are decoupled from one another and can be rotated relative to one another so that no torque can be transmitted between the components via the switching element, but rather the components are always connected or coupled to one another, thus permanently connected or coupled to one another in a rotationally stable manner.

[0023] Furthermore, the feature that two components can be connected or coupled to one another in a rotationally stable manner means that the components are assigned a switching element that can be switched between at least one coupling state and at least one decoupling state. In the coupling state, the components are connected or coupled to one another in a rotationally stable manner by means of the switching element. In the decoupling state, the components are decoupled from one another, so that in the decoupling state, the components can be rotated relative to one another about the component rotation axis. The same applies to the feature that two components can be connected or coupled to one another in a torque-transmitting manner.Thus, for example, the feature that two components can be used or coupled to one another to transmit torque means that a switching element is assigned to the components, wherein the switching element can be switched between at least one connected state and at least one released state. In the connected state, the components are coupled or connected to one another in a torque-transmitting manner by means of the switching element, so that torques can be transmitted between the components, in particular via the switching element. In the released state, the components are decoupled from one another, so that in the released state, no torque can be transmitted between components via the switching element.

[0024] In particular, the respective cylinder section is such a respective region or section or part of the stator carrier, the respective cylinder section of which is cylindrical on the outer circumference and, for example, also on the inner circumference and thus has the shape of a particularly right circular cylinder.

[0025] In order to be able to keep the installation space requirement of the wheel hub drive within a particularly small framework, it is further provided according to the invention that the conical section is formed from the second material and is formed in one piece with the second sleeve, also referred to as the outer sleeve.

[0026] Furthermore, the invention provides that the second material is an electrically non-conductive plastic. Thus, the plastic is preferably an electrically non-conductive material whose electrical conductivity is less than 10 -8 S*cnr 1In order to achieve a particularly compact design of the wheel hub drive, it has proven particularly advantageous if busbars designed separately from the stator carrier, separately from the rotor carrier, separately from the rotor, separately from the stator, separately from the wheel disc, separately from the wheel carrier and separately from the wheel bearing device, via which busbars the electrical machine can be supplied with electrical energy and / or electrical energy can be provided by the electrical machine, are embedded at least partially, in particular completely, in the second material, in particular in the non-conductive plastic, and thus, for example, in the second sleeve. By supplying the electrical machine with electrical energy, the electrical machine is operated, for example, in a motor and can therefore be operated as an electric motor.The wheel disc and thus the vehicle wheel can be driven, in particular purely electrically, by means of the electric motor. Furthermore, it is conceivable, for example, for the electric machine to be operated in generator mode and thus as a generator, by means of which kinetic energy of the motor vehicle can be converted into electrical energy that can be provided by the generator. For example, electrical energy provided or that can be provided by the electric machine in generator mode can be dissipated from the electric machine via at least one of the busbars. The electrical energy with which the electric machine can be supplied can, for example, be provided by an electrical energy storage device of the motor vehicle.Furthermore, for example, the electrical energy provided or capable of being provided by the generator can be supplied to the energy storage device, in particular via the at least one busbar, and thus stored in the electrical energy storage device. The electrical energy storage device is preferably a high-voltage component whose electrical voltage, in particular the electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts.

[0027] Since the second material is preferably an electrical non-conductor, and since the busbars are preferably at least partially embedded in the second material, the second material serves as electrical insulation for the busbars, which are electrically insulated by means of the second material.

[0028] Finally, the invention provides that the busbars extend at least partially within the conical section, so that, for example, the busbars are at least partially cast into the conical section. This allows the installation space requirement to be kept particularly small. In order to be able to keep the installation space requirement of the wheel hub drive particularly small, a further embodiment of the invention provides that the first cylinder section is formed from the second material and is formed integrally with the radially outer second sleeve.

[0029] A further embodiment is characterized in that the conical section is formed integrally with the first cylinder section, whereby the number of parts and thus the installation space requirement can be kept to a minimum.

[0030] The feature that two elements such as the conical section and the second sleeve are formed in one piece with each other is to be understood as meaning that the elements are not formed separately from each other and connected to each other, but the elements are formed from a single piece and thus integrally, that is to say formed in one piece, so that the elements are formed by a body formed in one piece, thus formed from a single piece and thus integrally manufactured and formed as a monoblock.

[0031] For example, a rotor carrier is provided by which the rotor is carried. In particular, it is provided that the rotor is formed separately from the rotor carrier and is connected, in particular permanently, in a rotationally fixed manner to the rotor carrier. In particular, the rotor is or comprises, for example, a laminated core, also referred to as a rotor laminated core. Alternatively or additionally, the rotor can comprise at least one or more magnets, in particular permanent magnets, which, for example, are held on the rotor laminated core and are thus carried by the rotor laminated core. Alternatively or additionally, the rotor can, for example, have at least one winding, also referred to as a rotor winding, which is held on the rotor laminated core and is thus carried by the rotor laminated core.In particular, the rotor, in particular in contrast to the rotor carrier, is a magnetically active element by means of which, for example, the aforementioned magnetic flux is to be or is guided, which can be generated by the electric machine, for example, during operation of the electric machine, in particular in order to drive the wheel disc or the vehicle wheel.

[0032] In order to keep the installation space requirement particularly low, a further embodiment of the invention provides for the busbars to be cast into the second material, in particular into the electrically non-conductive plastic. In order to be able to realize a particularly advantageous and compact mounting of the wheel disc on the wheel carrier, a further embodiment of the invention provides for the wheel bearing device to have a second wheel bearing which is arranged radially and axially overlapping the wheel carrier and is thus arranged in particular radially inside the wheel carrier, so that in particular the wheel carrier is arranged radially surrounding the second wheel bearing. The second wheel bearing is preferably designed as a second rolling bearing.

[0033] A second aspect of the invention relates to a motor vehicle, also referred to simply as a vehicle and preferably designed as a motor vehicle, in particular as a passenger car, which has at least one wheel hub drive according to the first aspect of the invention. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0034] It is preferably provided that the first cylinder section, the conical section and at least a part of the second cylinder section are formed integrally with one another, that is to say are formed from a single piece.

[0035] In this case, it is provided, for example, that the aforementioned second sleeve is the aforementioned part of the second cylinder section, so that the second sleeve, the conical section, and the first cylinder section are preferably formed integrally with one another. Thus, for example, the first cylinder section, the conical section, and the second sleeve are formed from the second material, in particular from the plastic.

[0036] In particular, it is provided that the first wheel bearing is arranged radially within the wheel carrier and axially overlapping the wheel carrier. This allows, for example, a particularly advantageous, separated bearing arrangement to be realized in a space-saving manner, so that a particularly advantageous bearing arrangement for the wheel disc and thus the vehicle wheel can be realized in a space-saving and weight-saving manner.

[0037] The wheel hub drive has, for example, a wheel hub, wherein it is conceivable that the wheel disc and thus the vehicle wheel are connected to the wheel hub, in particular in a non-destructively detachable manner, in such a way that the wheel disc and in particular the vehicle wheel are connected to the wheel hub in a rotationally fixed manner. In particular, the wheel hub is mounted on the wheel carrier by means of the wheel bearing device and via the wheel bearing device so as to be rotatable about the wheel rotation axis relative to the wheel carrier. For example, the second wheel bearing is a second partial bearing of the wheel bearing device, whereby a particularly advantageous separated bearing can be realized. The second partial bearing is arranged axially within the first partial bearing. In other words, the second wheel bearing is arranged axially within the first wheel bearing.

[0038] In order to be able to realize a particularly advantageous bearing arrangement in a particularly space-saving and weight-saving manner, it is preferably provided that the first wheel bearing has first rolling elements and a first raceway device which has a first raceway and a second raceway for the first rolling elements, arranged radially inside the first raceway. The second wheel bearing has second rolling elements which adjoin the first in the axial direction of the wheel hub drive, in particular such that the first rolling elements are spaced apart from the second rolling elements in the axial direction and vice versa. In addition, the second wheel bearing has a second raceway device which adjoins the first raceway device in the axial direction and is preferably spaced apart from the first raceway device in the axial direction.The second raceway device has a third raceway and a fourth raceway for the second rolling elements, arranged radially within the third raceway. When the wheel disc and, for example, the wheel hub rotate about the wheel's axis of rotation relative to the wheel carrier, the first rolling elements roll, in particular directly, on the first raceway and the second raceway, and the second rolling elements roll, in particular directly, on the third raceway and the fourth raceway.

[0039] The electric machine is preferably designed as an external rotor, i.e. as an external rotor machine, which is also referred to as an external rotor motor. This means in particular that the stator is connected to the wheel carrier on its radially inner side. Furthermore, it is provided, for example, that at least a section of the rotor carrier is arranged radially outside the stator, wherein the rotor carrier section is preferably an ignition section, i.e. a section of the rotor carrier that is cylindrical at least on the outer circumference and preferably also on the inner circumference. In particular, for example, the rotor is connected, in particular permanently, in a rotationally fixed manner to the rotor carrier and is thus supported by the rotor carrier. Very preferably, the electric machine is designed as an axial flux machine (AFM), which is also referred to as an axial flux motor.Further advantages, features, and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. The features mentioned above in the description are considered combinations, as are the features mentioned below in the description of the figures and / or shown alone in the figures and are considered combinations and can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0040] The drawing shows:

[0041] Fig. 1 shows a partial schematic longitudinal sectional view of a wheel hub drive for a motor vehicle;

[0042] Fig. 2 shows a partial schematic and sectional front view of a stator carrier of the wheel hub drive;

[0043] Fig. 3 shows a further schematic longitudinal sectional view of the wheel hub drive; and

[0044] Fig. 4 shows a further schematic and sectional front view of the stator carrier; and

[0045] Fig. 5 shows a further schematic and sectional front view of the stator carrier.

[0046] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0047] Fig. 1 shows a partial schematic longitudinal sectional view along a sectional plane BB shown in Fig. 2 of a wheel hub drive 10, also referred to as a wheel hub drive device or wheel hub drive unit, for a motor vehicle, also simply referred to as a vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car. By means of the wheel hub drive 10, a vehicle wheel 12 of the motor vehicle can be driven, in particular purely electrically, as will be explained in more detail below. The vehicle wheel 12 has a wheel disc 14 and a rim 16. At least the wheel disc 14 can be a component of the wheel hub drive 10, which can thus comprise at least the wheel disc 14. For example, the vehicle wheel 12 is a component of the wheel hub drive 10.A tire (not shown in the figures) made of rubber, for example, can be attached to the rim 16, which tire can thus be mounted on the rim 16. In the embodiment shown in Fig. 1, the rim 16 and the wheel disc 14 are formed separately from one another and, in particular, are permanently connected to one another in a rotationally fixed manner.

[0048] The wheel hub drive 10 has a wheel carrier 18 and a wheel bearing device 20, also referred to as a wheel bearing mechanism. By means of the wheel bearing device 20 and via the wheel bearing device 20, the wheel disc 14 is mounted on the wheel carrier 18 so as to be rotatable about a wheel rotation axis 22, also referred to as the main axis of rotation or rotation axis, relative to the wheel carrier 18. In the exemplary embodiment shown in Fig. 1, the vehicle wheel 12 is mounted on the wheel carrier 18 so as to be rotatable about the wheel rotation axis 22 relative to the wheel carrier 18 by means of the wheel bearing device 20 and via the wheel bearing device 20.

[0049] The wheel hub drive 10 has, in particular precisely, an electric machine 24, which in this case is designed as an axial flux machine. The electric machine 24 has a rotor 26 and a stator 28, by means of which the rotor 26 can be driven and is thus rotatable about the wheel rotation axis 22 relative to the wheel carrier 18 and relative to the stator 28. For example, the rotor 26 comprises the wheel disc 14, so that by driving the rotor 26, the wheel disc 14 and thus the vehicle wheel 12 can be driven and is thus rotatable about the wheel rotation axis 22 relative to the wheel carrier 18. Alternatively, it is provided here that the wheel hub drive 10 has a rotor carrier 27. Very particularly, the rotor 26 is formed separately from the rotor carrier 27 and is, in particular permanently, connected to the rotor carrier 27 in a rotationally fixed manner. The rotor carrier 27 has, for example, the wheel disc 14.In other words, the wheel disc 14 is preferably a component of the rotor carrier 27. By driving the vehicle wheel 12, the motor vehicle as a whole can be driven, for example. The rotor 26 comprises two rotor elements 30 and 32. Very particularly, the wheel disc 14 and thus the rotor carrier 27 are formed separately from the rotor 26 and separately from the rotor elements 30 and 32. The rotor elements 30 and 32, which are formed separately from the rotor carrier 27 and thus separately from the wheel disc 14, are connected, in particular permanently, in a rotationally fixed manner to the rotor carrier 27 and thus to the wheel disc 14. For example, the respective rotor element 30, 32 is at least substantially disc-shaped. From Fig. 1 it can be seen that the rotor elements 30 and 32 are spaced apart from one another in the axial direction of the wheel hub drive 10, the radial direction of which runs perpendicular to the axial direction of the wheel hub drive 10.The axial direction of the wheel hub drive 10 coincides with the wheel rotation axis 22, also referred to as the main axis of rotation, and the radial direction of the wheel hub drive 10 runs perpendicular to the axial direction of the wheel hub drive 10 and thus perpendicular to the wheel rotation axis 22 and is illustrated in Fig. 1 by an arrow 34.The stator 28 is arranged in the axial direction of the wheel hub drive 10 between the rotor elements 30 and 32 in such a way that the rotor element 30 is at least partially overlapped, i.e. covered, by the stator 28 in a first direction coinciding with the axial direction of the wheel hub drive 10 or running parallel to the axial direction of the wheel hub drive 10 and pointing from the rotor element 30 towards the rotor element 32, and such that the rotor element 32 is at least partially overlapped, i.e. covered, by the stator in a second direction opposite to the first direction, running parallel to the axial direction of the wheel hub drive 10 or coinciding with the axial direction of the wheel hub drive 10 and pointing from the rotor element 32 towards the rotor element 30. When reference is made to the radial direction above and below, this means, unless otherwise stated, the radial direction of the wheel hub drive 10.If reference is made to the axial direction above and below, this means, unless otherwise stated, the axial direction of the wheel hub drive 10.

[0050] The wheel hub drive 10 has a stator carrier 36, by means of which and via which the stator 28 is held, in particular permanently, in a rotationally fixed manner on the wheel carrier 18. In the exemplary embodiment shown in the figures, the stator 28 is formed separately from the stator carrier 36 and is, in particular permanently, connected in a rotationally fixed manner to the stator carrier 36. Furthermore, it is provided here that the stator carrier 36 is formed separately from the wheel carrier 18 and is, in particular permanently, connected in a rotationally fixed manner to the wheel carrier 18.

[0051] Fig. 2 shows a section of the stator carrier 36 in a schematic front view, wherein in Fig. 2 the stator carrier 36 is shown in section in a sectional plane, wherein the sectional plane runs perpendicular to the axial direction. From Fig. 2 it can be seen that the stator carrier 36 has first channels 38 which run within the stator carrier 36. In particular, a respective high-voltage line 40 is received in the respective first channel 38, which thus runs in the respective channel 38 and thus within the stator carrier 36. In particular, the high-voltage lines 40 are electrically connected to the stator 28. The high-voltage lines 40 are designed to transmit electrical energy at an electrical voltage which is preferably greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts.The stator support 36 also has second channels 42 which run within the stator support 36. The second channels 42 are cooling channels through which a preferably liquid coolant can flow, in particular such that the coolant directly contacts the stator support 36, i.e., a respective inner circumferential surface of the stator support 36, which in particular directly delimits the respective channel 42, on its way through the respective channel 42. Furthermore, it is conceivable for a respective cooling line, formed separately from the stator support 36 and through which the coolant can flow, to be accommodated, in particular precisely, in the respective channel 42. The coolant can thus flow through the respective channel 42, wherein, for example, the coolant can be guided to the stator 28 via at least one of the channels 42. Furthermore, it is conceivable for the coolant to be discharged from the stator 28 via at least one other of the channels 42.The stator 28 can be cooled by means of the coolant. The coolant is preferably an oil. The channels 42 are arranged, for example, in a coolant circuit through which the coolant can flow. Furthermore, it is conceivable for the respective high-voltage line 40 to be formed separately from the stator carrier 36.

[0052] In the exemplary embodiment shown in the figures, the stator carrier 36 also has at least or exactly one third channel 44 for a sensor line 46. The sensor line 46 is here formed separately from the stator carrier 36 and runs through the third channel 44 and thus within the stator carrier 36. The sensor line 46 is designed to transmit a signal, in particular an electrical signal, which characterizes a measured variable, for example. The wheel hub drive 10 has, for example, at least one sensor (not shown in the figures), by means of which the measured variable can be or is detected. The sensor can provide the signal, also referred to as a sensor signal, which can be conducted away from the sensor, for example, via the sensor line 46. The sensor line 46 is also referred to, for example, as a cable or signal cable.

[0053] One of the channels 38 can be seen in Fig. 1, wherein the high-voltage line 40 accommodated in one of the channels 38 is illustrated by an arrow 48 in Fig. 3. In particular, the arrow 48 illustrates that, for example, at least by means of the high-voltage line 40 accommodated in one of the channels 38, which is illustrated by the arrow 48, the stator 28 can be supplied with the aforementioned electrical energy, which can be or is provided, for example, by an electrical energy storage device of the motor vehicle. Overall, it can be seen that the channels 38, 42 and 44 are used to carry the high-voltage lines 40, the coolant and the sensor line 46, also referred to as the signal line.Thus, a guide, also referred to as a cable guide, for the high-voltage cables 40, the coolant and the sensor cable 46 is integrated into the stator carrier 36, whereby a particularly space- and weight-efficient design of the wheel hub drive 10 can be achieved.

[0054] 1 and 3 that the stator carrier 36 has a radially outer, i.e. in the radial direction outer, first cylinder section Z1, which is cylindrical at least on the outer circumference and preferably also on the inner circumference. The stator 28 is arranged axially overlapping and radially surrounding the first cylinder section Z1, wherein in this case the stator 28 is arranged, in particular directly, on the first cylinder section Z1. In particular, the stator 28 is connected, for example, in particular permanently, in a rotationally fixed manner to the first cylinder section Z1. In Fig. 1, 50 designates an outer circumferential surface of the first cylinder section Z1, wherein the outer circumferential surface 50 faces outwards in the radial direction of the wheel hub drive 10 and is cylindrical, thus having the shape of a right circular cylinder.In particular, the stator 28 is arranged, in particular directly, on the outer circumferential surface 50.

[0055] The stator carrier 36 also has a conical section K which is directly connected to the first cylinder section Z1 and extends radially from the first cylinder section Z1, i.e. in the radial direction of the wheel hub drive 10, inwards towards the wheel bearing device 20 and thus towards the wheel rotation axis 22, and axially towards the wheel carrier 18, i.e. in the direction of the wheel carrier 18. The stator carrier 36 has a second cylinder section Z2 which is directly connected to the conical section K. The second cylinder section Z2 is arranged axially, i.e. in the axial direction of the wheel hub drive 10, between the wheel carrier 18 and the conical section K. The second cylinder section Z2 is a radially inner cylinder section, since the cylinder section Z2 is arranged radially within the cylinder section Z1, and is therefore arranged radially further inwards than the cylinder section Z1.In the present case, however, it is provided that the cylinder section Z2 is arranged axially without overlap with the cylinder section Z1, and vice versa. It can also be seen from Figs. 1 and 3 that the cylinder section Z1 is arranged axially overlapping the stator 28, and that the second cylinder section Z2 is arranged radially within the first cylinder section and axially offset from the stator 28.

[0056] From Fig. 2 it can be seen that the stator carrier 36 has at least one or in this case several openings 52, also referred to as screw openings. A respective fastening element is arranged, in particular precisely, in the respective opening 52. By means of the respective fastening element, the stator carrier 36 is fastened to the wheel carrier 18 and is thereby connected, in particular permanently, in a rotationally fixed manner to the wheel carrier 18. The respective fastening element is, for example, a respective screw element, in particular a screw, so that, for example, the stator carrier 36 is screwed to the wheel carrier 18 by means of the respective screw element and is thereby connected, in particular permanently, in a rotationally fixed manner to the wheel carrier 18.The channels 38, 42 and 44 and preferably also the openings 52 are spaced apart from one another, in particular fluidically separated from one another, at least within the stator carrier 36, in particular when viewed in pairs, and each run within the stator carrier 36. In Fig. 1, one of the fastening elements can be seen and is designated by 53.

[0057] From Fig. 3, using the example of the one channel 38 shown in Fig. 3, it can be seen that, for example, the respective channel 38, 42, 44, in particular precisely, is assigned a respective further channel 54 running in the wheel carrier 18. The further channel assigned to the one channel 38 shown in Fig. 1 and running in the wheel carrier 18 is designated by 54 in Fig. 3. In this case, for example, the respective high-voltage line 40 or the sensor line 46 is arranged in the respective further channel assigned to the respective channel 38 or 44 and running in the wheel carrier 18. Furthermore, the respective further channel assigned to the respective channel 42 and running in the wheel carrier 18 can be flowed through by the coolant, which flows or can flow through the respective channel 42.Thus, the high-voltage lines 40, the sensor line 46 and the coolant can come from the wheel carrier 18 and thus be introduced from the wheel carrier 18 into the respective channels 38, 42 and 44 and fed via these to the stator 28 and / or vice versa.

[0058] In the wheel hub drive 10, for example, it is provided that the respective first channel 38 has a respective first channel section and the respective second channel 42 has a respective second channel section. The first channel sections and the second channel sections extend, for example, in the axial direction of the wheel hub drive 10 in a wall W of the second cylinder section Z2. In Fig. 1, the first channel section of the one channel 38 visible in Fig. 3 is designated KA1. As will be explained in more detail below, at least a part of the second cylinder section Z2 and the cylinder section Z1 and the conical section K are integrally formed with one another, thus formed from a single piece, so that the cylinder section Z1, the conical section K and at least part of the second cylinder section Z2 are formed by a body KR, which is integral, i.e., formed in one piece and thus formed from a single piece.In other words, the body KR is designed as a monoblock. More specifically, the body KR is manufactured by casting and is thus designed as a cast component, also known as a casting.

[0059] For example, the stator carrier 36 has a third cylinder section Z3, which is arranged, for example, axially, i.e., in the axial direction of the wheel hub drive 10, between the second cylinder section Z2 and the wheel disc 14. In the exemplary embodiment shown in the figures, the third cylinder section Z3 adjoins the cylinder section Z2 in the axial direction and toward the wheel disc 14, i.e., directly, so that no other, further region or section of the stator carrier 36 is arranged between the cylinder section Z2 and the cylinder section Z3 in the axial direction. For example, the cylinder section Z3 is formed by the body KR, so that the cylinder section Z3, at least part of the cylinder section Z2, the conical section K, and the first cylinder section Z1 are preferably formed integrally with one another and are thus connected to one another, in particular permanently, in a rotationally fixed manner.The respective high-voltage line 40 is, for example, a respective busbar or is also referred to as a busbar.

[0060] The rotor carrier 27 and thus the wheel hub drive 10 have a rotor cover 56, which in this case is formed separately from the wheel disc 14 and is connected, in particular permanently, in a rotationally fixed manner to the wheel disc 14. The rotor element 30 is connected, in particular permanently, in a rotationally fixed manner to the rotor cover 56. The wheel disc 14 can be a further part of the rotor carrier 27, since, for example, the rotor element 32 is connected, in particular permanently, in a rotationally fixed manner to the wheel disc 14. The rotor carrier 27 has a rotor carrier section 58, which is cylindrical at least on the outer circumference and, in this case, for example, also on the inner circumference. In particular, the rotor carrier section 58 and the wheel disc 14 are formed integrally with one another, i.e., formed from a single piece.In order to be able to realize a particularly compact design of the wheel hub drive 10, the wheel hub drive 10 has a seal 60, also referred to as a sealing element and made of rubber, for example, by means of which the rotor cover 56 and thus the rotor carrier 27 are sealed against the cylinder section Z2 and thus against the stator carrier 36. For this purpose, an annular gap R arranged radially, i.e. in the radial direction of the wheel hub drive 10, between the rotor cover 56 and the second cylinder section Z2 is sealed by means of the seal 60, which annular gap R is directly delimited in the radial direction of the wheel hub drive 10 outwards by the rotor cover 56, on the inside by an inner circumferential surface M1 of the rotor cover 56, and in the radial direction inwards by the cylinder section Z2, in particular an outer circumferential surface M2 of the cylinder section Z2.In this case, for example, the outer surface M1 and / or the outer surface M2 is cylindrical. The seal 60 rests, for example, directly on the one hand on the outer surface M1 and directly on the outer surface M2, as a result of which the annular gap R is bridged, in particular completely, by the seal 60 and thus sealed. For example, the seal 60 is rotatable with the rotor carrier 27 about the wheel rotation axis 22 relative to the wheel carrier 18 and relative to the cylinder section Z2, so that, for example, the seal 60 is connected, in particular permanently, in a rotationally fixed manner to the rotor carrier 27. Alternatively, it would be conceivable for the seal 60 to be connected, in particular permanently, in a rotationally fixed manner to the cylinder section Z2 and thus to the stator carrier 36, so that the rotor carrier 27 and thus the rotor cover 56 are rotatable about the wheel rotation axis 22 relative to the seal 60.

[0061] For example, the body KR is made of aluminum, i.e. an aluminum alloy.

[0062] By means of the wheel bearing device 20, for example, a separated bearing is realized. For this purpose, the wheel bearing device 20 has a first wheel bearing RL1, also referred to as the first bearing, and a second wheel bearing RL2, also referred to as the second bearing. The second wheel bearing RL2 is arranged on a side S1 of the first wheel bearing RL1, which side faces the wheel carrier 18 in the axial direction and faces away from the wheel disc 14. The first wheel bearing RL1 has first rolling elements 62 and a first raceway device which has a first raceway 64 and a second raceway 66, arranged radially inside the first raceway 64, for the rolling elements 62. The second wheel bearing RL2 has second rolling elements 68 and a second raceway device which has a third raceway 70 and a fourth raceway 72 for the second rolling elements 68.If the wheel disc 14 and thus the vehicle wheel 12 rotate about the wheel rotation axis 22 relative to the wheel carrier 18, the rolling elements 62 roll directly on the raceways 64 and 66, and the rolling elements 68 roll directly on the raceways 70 and 72.

[0063] It can be seen that the seal 60 is arranged axially overlapping and radially surrounding the second cylinder section Z2. Furthermore, the seal 60 is arranged axially between the first wheel bearing RL1 and the wheel carrier 18, in particular between the wheel bearing RL1 and the wheel bearing RL2. The conical section K is arranged axially overlapping the first wheel bearing RL1, with the second cylinder section Z2 being arranged axially between the conical section K and the wheel carrier 18.

[0064] From Fig. 1 to 4 it can be seen that the second cylinder section Z2 has a radially inner, first sleeve H1 and a radially outer, second sleeve H2. The sleeve H1 is also referred to as the inner sleeve and the second sleeve H2 is also referred to as the outer sleeve. The sleeves H1 and H2 are particularly clearly visible in Fig. 1, 3 and 5 and are not shown separately in Fig. 2 and 4. The first sleeve H1 is formed from a first material, which is a metallic material. The sleeve H2 is formed from a second material which is different from the first material and which, in the exemplary embodiment shown in the figures, is or comprises a plastic. The plastic is preferably an electrically non-conductive plastic, so that the plastic is preferably a non-conductor whose electrical conductivity is less than 10 -8 S*cnr 1In the exemplary embodiment shown in the figures, the sleeve H2 is the aforementioned part of the second cylinder section Z2, so that in the exemplary embodiment shown in the figures, the sleeve H2, the conical section K, and the first cylinder section Z1 are formed integrally with one another and are made of the second material, in this case plastic. This therefore also means that the body KR forms the second sleeve H2, the conical section K, and the first cylinder section Z1, with the body KR being made of the second material, and thus in this case plastic. In this case, the first sleeve H1 and thus the first, metallic material form the raceways 64 and 70.

[0065] From Fig. 5 it can be seen that the respective opening 52 is delimited completely in its respective circumferential direction by the sleeve H1 and thus the sleeve H1 is formed such that the respective opening 52 is formed completely in the sleeve H1. The respective channel 38, 44 is delimited along its respective circumferential direction partly by the sleeve H1 and partly by the sleeve H2, i.e. partly by the first material and partly by the second material in each case. From Fig. 5 it can be seen that the respective high-voltage line 40 and the sensor line 46 are each at least partially embedded in the second material and thus in this case in the plastic. For example, the respective high-voltage line 40 or the sensor line 46 is cast in the second material. In particular, the second material is cast and / or injection-molded onto the sleeve H1.

[0066] In the exemplary embodiment shown in the figures, the wheel hub drive 10 also has a wheel hub sleeve 80, which in the present case is, for example, a component of a wheel hub 82. It can be seen that the wheel disc 14 is formed separately from the wheel hub 82 and is connected to the wheel hub 82 in a rotationally fixed manner. In particular, the wheel disc 14 is formed separately from the wheel hub 82 and is connected to the wheel hub 82 in a non-destructively detachable manner such that the wheel disc 14 is connected to the wheel hub 82 in a rotationally fixed manner. For this purpose, for example, the wheel disc 14 is screwed to the wheel hub 82 by means of screws and is connected to the wheel hub 82 in a non-destructive and rotationally fixed manner. One of these screws can be seen in Fig. 1 and is designated 84.

[0067] The wheel hub sleeve 80 forms the raceways 66 and 62 and, in this case, is a radially inner, first bearing shell of the wheel bearing device 20. The sleeve H1 is, in this case, a radially outer, second bearing shell of the wheel bearing device 20, wherein the second bearing shell is arranged axially overlapping and radially surrounding the first bearing shell. The wheel hub 82 and thus the second bearing shell, and thus the wheel hub sleeve 80, are rotatable about the wheel rotation axis 22 relative to the sleeve H1 and thus relative to the second wheel bearing shell of the wheel bearing device 20.

[0068] In the method for manufacturing the wheel hub drive 10, for example, the high-voltage lines 40, which are designed in particular as busbars or also referred to as busbars, are arranged on the already manufactured sleeve H1, whereupon, in a state in which the high-voltage lines 40 are arranged on the sleeve H1, the second material and thus the sleeve H2 are cast and / or injection-molded onto the sleeve H1. As a result, the high-voltage lines 40 are each at least partially cast into the second material and thus into the sleeve H2.

[0069] 10 Wheel hub drive

[0070] 12 vehicle wheel

[0071] 14 Wheel disc

[0072] 16 rim

[0073] 18 wheel carriers

[0074] 20 wheel bearings

[0075] 22 Wheel rotation axis

[0076] 24 electric machine

[0077] 26 Rotor

[0078] 27 rotor carrier

[0079] 28 Stator

[0080] 30 rotor element

[0081] 32 rotor element

[0082] 34 Double arrow

[0083] 36 stator carriers

[0084] 38 first channel

[0085] 40 high-voltage cable

[0086] 42 second channel

[0087] 44 third channel

[0088] 46 Sensor cable

[0089] 48 Arrow

[0090] 50 outer circumferential surface

[0091] 52 Opening

[0092] 53 Fastening element

[0093] 54 additional channels

[0094] 56 rotor cover

[0095] 58 Rotor carrier section

[0096] 60 Seal

[0097] 62 first rolling elements

[0098] 64 first career

[0099] 66 second career

[0100] 68 second rolling elements

[0101] 70 third career 72 fourth career

[0102] M1 inner circumferential surface

[0103] M2 outer peripheral surface

[0104] K Conical section

[0105] KR Body

[0106] H1 first sleeve

[0107] H2 second sleeve

[0108] RL1 first wheel bearing

[0109] RL2 second wheel bearing

[0110] S1 page

[0111] Z1 first cylinder section

[0112] Z2 second cylinder section

[0113] Z3 third cylinder section

[0114] KA1 first canal section

Claims

Mercedes-Benz Group AG Patent claims 1. Wheel drive (10) for a motor vehicle, having a wheel carrier (18), having a wheel bearing device (20) which has at least one first wheel bearing (RL1), having a brake disc (14) which is rotatably mounted on the wheel carrier (18) by means of the wheel bearing (20), having an electric machine (24) which has a stator (28) and a rotor (26), and having a stator carrier (36) by means of which the stator (28) is held non-rotatably on the wheel carrier (18), wherein the stator carrier (36) has a first cylinder section (Z1) arranged axially overlapping the stator (28) and a second cylinder section (Z2) arranged radially inside the first cylinder section (Z1) and axially offset from the stator (28), wherein the second cylinder section (Z2) has a first sleeve (H1) formed from a metallic first material and located radially inward, and a second sleeve (H2) located radially outward, which is made of a material different from the first material,is formed of a second material, characterized in that the stator carrier (36) has a conical section (K) which is arranged axially overlapping the first radial bearing (RL1), the second cylindrical section (Z2) being arranged axially between the conical section (K) and the wheel carrier (18), the conical section (K) being formed of the second material and being formed integrally with the second sleeve (H2), the second material being an electrically non-conductive material, busbars (40) through which the electric machine (24) can be supplied with electrical energy and / or electrical energy can be provided by the electric machine (24) being embedded in the second material, the busbars (40) at least partially running in the conical section (K).

2. The spoke drive according to any one of the preceding claims, characterized in that the first cylinder section (Z1) is formed from the second material and is formed integrally with the radially outer second sleeve (H2).

3. The spoke drive according to claim 2, characterized in that the conical section (K) is formed integrally with the first cylinder section (Z1).

4. The spoke drive (10) according to any one of the preceding claims, characterized in that the busbars (40) are cast into the second material.

5. A motor vehicle having at least one spoke drive (10) according to any one of the preceding claims.

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