Wheel hub drive for a motor vehicle and motor vehicle

Abstract

The invention relates to a wheel hub drive (10) for a motor vehicle, comprising a wheel carrier (18), a wheel bearing device (20) which has a first wheel bearing (RL1) and a second wheel bearing (RL2), a wheel disc (14) which is rotatably mounted on the wheel carrier (18) by means of the wheel bearing device (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 held in a rotationally fixed manner on the wheel carrier (18), wherein the stator carrier (36) has a first cylinder section (Z1) arranged axially at least partially 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) is arranged axially between the first wheel bearing (RL1) and the second wheel bearing (RL2).

Description

[0001] 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.

[0002] WO 2022 / 096504 A1 discloses a wheel system for a vehicle, comprising a stator, a rotor and a pivot bearing.

[0003] 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-saving design of the wheel hub drive can be realized.

[0004] 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 10. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0005] 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, which are arranged one behind the other and thus consecutively in the longitudinal direction of the motor vehicle and are simply also 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, for example, is formed 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 or 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 wheel. Preferably, the first vehicle wheel and the second vehicle wheel are the vehicle wheels of the same vehicle axle. When reference is made above and below to the vehicle wheel, this refers to the first vehicle wheel, unless otherwise stated. The above and following statements regarding the first wheel hub drive and the first vehicle wheel can readily be applied to the second wheel hub drive and the second vehicle wheel, and vice versa.

[0006] The wheel hub drive has a wheel carrier and a wheel bearing device, which has a first wheel bearing and a second wheel bearing. The first wheel bearing is thus, for example, a first partial bearing of the wheel bearing device, and the second wheel bearing is, for example, a second partial bearing of the wheel bearing device. Preferably, the first wheel bearing and the second wheel bearing are each designed as a rolling bearing, so that the wheel bearing device as a whole is preferably 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, with the wheel hub drive comprising the wheel disc. Thus, for example, the vehicle wheel of the motor vehicle is rotatably mounted on the wheel carrier via the wheel bearing device and by means of the wheel bearing device.In particular, if the wheel disc and thus, for example, the first vehicle wheel is mounted on the wheel carrier via the wheel bearing device so as to be rotatable about a wheel rotation axis relative to the wheel carrier. The vehicle wheel has, for example, the wheel disc and a rim which is, in particular permanently and non-rotatably connected to the wheel disc. The rim and the wheel disc can therefore 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 for 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 location of the first vehicle wheel.For example, a tire, particularly of the first vehicle wheel, made of rubber, is attached to a rim, so that the tire is, so to speak, mounted on the rim. In particular, when the vehicle wheel rolls along the ground, the tire rolls, particularly directly, along the ground.

[0007] 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 on the wheel carrier in a rotationally fixed manner. In particular, it is provided that the stator is formed separately from the stator carrier and is, in particular permanently, connected to the stator carrier in a rotationally fixed manner.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 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 can be 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 particular in order to drive the wheel disc or the vehicle wheel.

[0008] 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.

[0009] The stator carrier has a first cylinder section arranged axially at least partially 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 circumference and preferably also on the inner circumference and thus has the shape of a particularly right circular cylinder. In particular, it is provided, for example, 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).

[0010] In order to be able to realize a particularly space- and weight-efficient way of the wheel hub drive, it is provided according to the invention that the second cylinder section is arranged axially, that is to say in the axial direction of the wheel hub drive and thus viewed along the main axis of rotation, at least partially, in particular at least predominantly and thus more than half or completely between the first wheel bearing and the second wheel bearing.

[0011] In order to be able to mount the wheel disc on the wheel carrier in a particularly space-efficient manner, one embodiment of the invention provides 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 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 achieve a particularly advantageous and compact design of the wheel hub drive.

[0012] In the context of the present disclosure, the features “radially overlapping” are to be understood as follows: Two elements, in particular at least substantially rotationally symmetrical, are arranged radially, in particular with respect to one another, in particular with respect to a common axis, for example running 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 is to be understood as the radial direction of the wheel hub drive, unless otherwise stated.

[0013] 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 running in particular 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. 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.

[0014] 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 on 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 when the motor vehicle is traveling straight ahead, 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.

[0015] 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 the wheel carrier in a rotationally fixed manner if it cannot be rotated relative to the wheel carrier.

[0016] The feature that two components are connected or coupled to one another in a torque-transmitting manner means 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 rotationally fixed 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 rotationally fixed 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.

[0017] 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.

[0018] In particular, the feature that two components are permanently connected or coupled to one another in a rotationally fixed manner is to be understood as meaning that a switching element is not provided which can be switched between a coupling state that connects or couples the components to one another in a rotationally fixed manner and a decoupling state in which the components are decoupled from one another and rotatable relative to one another, so that no torque can be transmitted between the components via the switching element. Instead, the components are always, and therefore permanently, connected or coupled to one another in a rotationally fixed manner. Furthermore, the feature that two components can be connected or coupled to one another in a rotationally fixed manner is to be understood as meaning that the components are assigned a switching element which can be switched between at least one coupling state and at least one decoupling state.In the coupled state, the components are connected or coupled to one another in a rotationally fixed manner by means of the switching element. In the uncoupled state, the components are decoupled from one another such that in the uncoupled 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 connected or coupled to one another in a torque-transmitting manner is to be understood as meaning 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 such that torques can be transmitted between the components, in particular via the switching element.In the release state, the components are decoupled from each other, so that in the release state no torque can be transmitted between the components via the switching element.

[0019] 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 side and, for example, also on the inner circumference side and thus has the shape of a particularly right circular cylinder.

[0020] In order to be able to keep the installation space requirement of the wheel hub drive within a particularly small framework, it is provided in a further embodiment of the invention that the first cylinder section is formed from the second material and is formed integrally with the radially outer second sleeve.

[0021] In order to be able to realize a wheel hub drive that is particularly weight- and space-efficient, one embodiment of the invention provides for the stator carrier to have a conical section that is arranged axially between the first cylinder section and the second cylinder section. The conical section is preferably arranged axially overlapping the first wheel bearing. The second cylinder section is preferably 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 second region, second part or second section of the stator carrier, the second region, second part or second section of which is conical at least on the outer circumference and preferably also on the inner circumference and thus 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, immediately, i.e. directly, adjoins the first cylinder section and the second cylinder section, in particular such 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 the 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 an extension direction 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, viewed from the first cylinder section in a radially inward direction towards the wheel bearing device and thus the wheel rotation axis. The conical section thus tapers starting from the first cylinder section towards the wheel carrier. Viewed conversely, the conical section widens from the wheel carrier towards the first cylinder section. This allows for a particularly compact design.

[0022] Since the second cylinder section is arranged radially, i.e., in the radial direction of the wheel hub drive, within the first cylinder section, 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., viewed 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.

[0023] In order to be able to keep the installation space requirement of the wheel hub drive within a particularly small framework, it is provided in a further embodiment of the invention that the conical section is formed from the second material and is formed integrally with the first cylinder section and integrally with the radially outer second sleeve, also referred to as the outer sleeve.

[0024] Thus, it is preferably provided that the first cylinder section, the conical section, and the radially outer second sleeve are formed integrally with one another, thus being formed from a single piece, so that the first cylinder section, the conical section, and the radially outer second sleeve are formed by a single-piece, integrally manufactured body, which is a monoblock. The body is formed from the second material. This allows the number of parts and thus the installation space requirement to be kept to a particularly low level.

[0025] The feature that two elements, such as the conical section and the first cylindrical section, are formed in one piece with one another means that the elements are not formed separately from one another and connected to one another, but rather the elements are formed from a single piece and are thus formed in one piece, that is to say in one part, so that the elements are formed by a body which is formed in one piece, and is therefore formed from a single piece and is thus manufactured integrally or is formed as a monoblock.

[0026] A further embodiment is characterized by a split busbar, which is preferably formed separately from the first cylinder section, the second cylinder section, the conical section and preferably also the wheel carrier. Thus, it is preferably provided that the split busbar is formed separately from the body and also separately from the first sleeve. The feature that the busbar is a split busbar is to be understood in particular that the split busbar has at least or exactly two separately formed busbar parts, namely a first busbar part and a second busbar part. The busbar parts are formed separately from one another and at least electrically connected to one another, i.e. are electrically contacted with one another. Preferably, the busbar parts are also mechanically connected to one another.The electrical machine can be supplied with electrical energy via the split busbar and / or electrical energy can be discharged from the electrical machine via the split busbar.

[0027] 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, in particular permanently, connected to the rotor carrier in a rotationally fixed manner. 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 are held, for example, 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.

[0028] Preferably, the split busbar is formed 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, separately from the cylinder sections, separately from the conical section and thus in particular separately from the sleeves.

[0029] By supplying the electric machine with electrical energy, the electric machine can be operated, for example, in motor mode and thus 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, the electrical energy provided or that can be provided by the electric machine in generator mode can be discharged from the electric machine via the busbar. 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 available by the generator can be supplied to the electrical energy storage device, in particular via the 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 most preferably amounts to several hundred volts.

[0030] It is provided that the first busbar part of the busbar is arranged and thus extends in the conical section. The second busbar part of the busbar, which is formed separately from the first busbar part and is at least electrically and preferably also mechanically connected to the first busbar part, is arranged in the second cylindrical section and thus extends in the second cylindrical section.

[0031] In order to be able to connect the conductor rail parts electrically and mechanically to one another in a particularly simple and space-saving manner, so that the wheel hub drive can be manufactured particularly quickly and cost-effectively, a further embodiment of the invention provides for the wheel hub drive to have a coupling device which is designed to releasably connect the conductor rail parts to one another, in particular non-destructively. In other words, it is preferably provided that the conductor rail parts are non-destructively releasably connected to one another by means of the coupling device, whereby the conductor rail parts are mechanically and electrically connected to one another. The conductor rail parts are preferably screwed to one another by means of the coupling device and are thus releasably connected to one another in a non-destructive manner. For example, the coupling device is arranged between the conductor rail parts.Furthermore, it is conceivable for a first coupling part of the coupling device to be formed by the first busbar. Furthermore, it is conceivable for a second coupling part of the coupling device to be formed by the second busbar. The coupling parts are, for example, formed separately from one another and connected to one another in a non-destructively releasable manner, whereby the busbar parts are connected to one another in a non-destructively releasable manner.

[0032] In a further, particularly advantageous embodiment of the invention, a first coupling half of the coupling device is cast into the conical section. In particular, the first coupling half is the aforementioned first coupling part. This allows the installation space requirement of the wheel hub drive to be kept particularly low.

[0033] In order to realize a particularly compact design of the wheel hub drive, it is provided in a further embodiment of the invention that the first conductor rail part is cast into the conical section.

[0034] It is preferably provided that the second busbar part is cast into the second cylinder section.

[0035] It has proven particularly advantageous if the second material is designed as electrical insulation for the first busbar part and / or the second busbar part. In other words, it is preferably provided that the second material is designed as an electrical non-conductor whose electrical conductivity is less than 10 -8 S*cm -1As a result, the second material for the first busbar part and / or for the second busbar part is an electrical insulator, by means of which the first busbar part and / or the second busbar part is electrically insulated.

[0036] Most preferably, the second material is formed as an electrically non-conductive plastic, which is a non-conductor whose electrical conductivity is less than 10 -8 S*cm -1 is.

[0037] For example, it is conceivable for a second coupling half of the coupling device to be cast into the second cylinder section, thereby allowing a particularly compact design. For example, the second coupling half is the aforementioned second coupling part.

[0038] In particular, it can be provided that the first busbar part and the second busbar part are at least partially, in particular at least predominantly and thus at least more than half or completely, embedded in the second material, in particular in the plastic. It is particularly conceivable that the first busbar part and / or the second busbar part are cast into the second material, in particular in the plastic.

[0039] The second radial bearing is arranged, for example, radially and axially overlapping the wheel carrier and thus arranged in particular radially within the wheel carrier, so that in particular the wheel carrier is arranged radially surrounding the second wheel bearing.

[0040] A second aspect of the invention relates to a motor vehicle, also simply referred to 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.

[0041] In particular, it is provided that the wheel bearings are arranged spaced apart from one another in the axial direction of the wheel hub drive and are thus arranged one behind the other, thereby providing a particularly advantageous separated bearing arrangement. In particular, it is provided that the first wheel bearing is arranged radially within the wheel carrier and axially overlapping the wheel carrier.

[0042] 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. Very particularly, the second wheel bearing is arranged axially within the first wheel bearing.

[0043] In order to be able to realize a particularly advantageous bearing arrangement in a particularly space- and weight-efficient manner, it is preferably provided that the first wheel bearing has first rolling elements and a first raceway device upwards, which has a first raceway and a second raceway arranged radially inside the first raceway for the first rolling elements. The second wheel bearing has second rolling elements which adjoin the first rolling elements 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 of the wheel hub drive 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 on the second raceway, and the second rolling elements roll, in particular directly, on the third raceway and on the fourth raceway.

[0044] 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 section of the rotor carrier also referred to as the rotor carrier section is a cylindrical 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, to the rotor carrier in a rotationally fixed manner 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.

[0045] 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 and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, 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.

[0046] The drawing shows in: Fig. 1 shows a partial schematic longitudinal sectional view of a wheel hub drive for a motor vehicle; Fig. 2 a partial schematic and sectional front view of a stator carrier of the wheel hub drive; Fig. 3 shows a further schematic longitudinal sectional view of the wheel hub drive; Fig. 4 shows a further schematic and sectioned front view of the rotor carrier; Fig. 5 shows a further schematic and sectioned front view of the stator carrier; Fig. 6 a schematic and sectional side view of the stator carrier during assembly of the wheel hub drive; and Fig. 7 another schematic and sectional side view of the stator carrier.

[0047] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0048] Fig. 1 shows a schematic longitudinal section along a section in Fig. 2 shows 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 and made of rubber, for example) can be attached to the rim 16, which tire can thus be mounted, so to speak, on the rim 16. In the Fig. In the embodiment shown in Figure 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.

[0049] The wheel hub drive 10 has a wheel carrier 18 and a wheel bearing device 20, which is also referred to as a wheel bearing device. 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 rotation axis or rotation axis, relative to the wheel carrier 18. Fig. 1, the vehicle wheel 12 is mounted on the wheel carrier 18 by means of the wheel bearing device 20 and via the wheel bearing device 20 so as to be rotatable about the wheel rotation axis 22 relative to the wheel carrier 18.

[0050] 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 thereby 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 thereby 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 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 is 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 is perpendicular to the axial direction of the wheel hub drive 10 and thus perpendicular to the wheel rotation axis 22 and is 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 above and below to the radial direction, unless otherwise stated, this refers to the radial direction of the wheel hub drive 10. When reference is made above and below to the axial direction, unless otherwise stated, this refers to the axial direction of the wheel hub drive 10.

[0051] 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.

[0052] Fig. 2 shows the stator carrier 36 in detail in a schematic front view, wherein in Fig. 2 the stator carrier 36 is shown in particular in a section plane, wherein the section plane is perpendicular to the axial direction. Fig. 2 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 with 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 carrier 36 also has second channels 42 which run within the stator carrier 36.The second channels 42 are cooling channels through which a preferably liquid coolant can flow, in particular such that the coolant, on its way through the respective channel 42, 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. Furthermore, it is conceivable that a respective cooling line, formed separately from the stator support 36 and through which the coolant can flow, is accommodated in the respective channel 42, in particular precisely. 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 that the coolant can 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 that the respective high-voltage line 40 is formed separately from the stator carrier 36.

[0053] In the embodiment shown in the figures, the stator carrier 36 also has at least or exactly one third channel 44 for a sensor line 46.

[0054] In this case, the sensor line 46 is 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, in particular, an electrical signal which characterizes, for example, a measured variable. 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 detected 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.

[0055] In Fig. 1 one of the channels 38 is visible, where in Fig. 3, the high-voltage line 40 accommodated in one channel 38 is illustrated by an arrow 48. In particular, the arrow 48 illustrates that, for example, at least by means of the high-voltage line 40 accommodated in one channel 38, which is illustrated by the arrow 48, the stator 28 can be supplied with the aforementioned electrical energy, which can be provided 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 guide 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 the line guide, for the high-voltage lines 40, the coolant, and the sensor line 46 is integrated into the stator carrier 36, whereby a particularly space- and weight-efficient design of the wheel hub drive 10 can be represented.

[0056] Out of Fig. 1 and Fig. 3, it can be seen that the stator carrier 36 has a radially outer, i.e., radially 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, for example, permanently, connected to the first cylinder section Z1 in a rotationally fixed manner. Fig. 1, 50 denotes an outer circumferential surface of the first cylinder section Z1. The outer circumferential surface 50 faces outward 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.

[0057] The stator carrier 36 also has a conical section K which is directly connected to the first cylinder section Z1 and which 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. Fig. 1 and Fig. 3 it can also be seen that the cylinder section Z1 is arranged axially overlapping the stator 28, and that the second cylinder section Z2 is arranged radially inside the first cylinder section and axially offset from the stator 28.

[0058] Out of Fig. 2 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 at least within the stator carrier 36, in particular when viewed in pairs, in particular fluidically separated from one another and each run within the stator carrier 36. In . Fig. 1 one of the fastening elements is visible and labeled 53.

[0059] Out of Fig. 3 is based on the example of 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 channel 54 shown in Fig. 1, a channel 38 is assigned to the wheel carrier 18, and a further channel is shown in Fig. 3, designated 54. For example, the respective high-voltage line 40 or the sensor line 46 is arranged in the respective additional channel, which is assigned to the respective channel 38 or 44 and runs in the wheel carrier 18. Furthermore, the respective additional channel, which is assigned to the respective channel 42 and runs 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.

[0060] 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. Fig. 1 is the first channel section of the Fig. 3, a channel 38 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 formed integrally with one another, thus consisting of 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. is formed in one piece and thus consists of a single piece. In other words, the body KR is formed as a monoblock. In particular, the body KR is produced by casting and is thus formed as a cast component, also referred to as a casting.

[0061] 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.

[0062] 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, in particular, permanently and non-rotatably connected to the wheel disc 14. The rotor element 30 is, in particular, permanently and non-rotatably connected 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, in particular, permanently and non-rotatably connected 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.

[0063] 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 lateral surface M1 and / or the lateral surface M2 is cylindrical. The seal 60, for example, lies directly on the one hand against the lateral surface M1 and on the other hand directly against the lateral surface M2, whereby 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.

[0064] For example, the body KR is made of aluminum, i.e. an aluminum alloy.

[0065] 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.

[0066] 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.

[0067] Out of 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 well made of Fig. 1, Fig. 3 and Fig. 5 recognizable and in Fig. 2 and Fig. 4 is not shown separately. The first sleeve H1 is formed from a first material, which is a metallic material. The sleeve H2 is formed from a second material different from the first material, 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*cm -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, it is provided that 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.

[0068] Out of Fig. 5 shows that the respective opening 52 is delimited in its respective circumferential direction completely circumferentially 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 directly 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. Fig. 5 shows 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 and the sensor line 46 are cast into the second material. In particular, the second material is cast and / or injection-molded onto the sleeve H1.

[0069] 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 is shown in Fig. 1 and labeled 84.

[0070] 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.

[0071] In the method for manufacturing the wheel hub drive 10, for example, the high-voltage lines 40, which are particularly designed as busbars or also referred to as busbars, are arranged on the already manufactured sleeve H1. After this, 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.

[0072] Fig. 6 shows a partial schematic and sectional side view of the stator carrier 36, wherein in Fig. 6, in particular, the body KR can be seen in a schematic and sectional side view. As already described above, the body KR, which is formed in one piece, forms the first cylinder section Z1, the conical section K, and the radially outer second sleeve H2, so that the radially outer second sleeve H2, the conical section K, and the first cylinder section Z1 are formed in one piece with one another, i.e., are formed in a single piece. Fig. 6 is also one of the channels 38. In Fig. 6 illustrates an assembly, i.e., a method for assembling or manufacturing the wheel hub drive 10.

[0073] Fig. Figure 7 shows the body KR in a schematic and sectional side view, as will be explained in more detail below. Fig. 6 and Fig. 7 is also one of the high-voltage lines 40, whereby at least the Fig. 6 and Fig. 7 is designed as a busbar STS. The previous and following explanations regarding the high-voltage line 40 designed as a busbar STS can easily be applied to the other high-voltage lines 40 and vice versa. For example, the electric machine 24 can be supplied with electrical energy via the busbar STS. Alternatively or additionally, electrical energy can be dissipated from the electric machine 24 via the busbar STS. Very particularly, it is provided that the stator 28 can be supplied with electrical energy via the busbar STS and / or electrical energy can be dissipated from the stator 28 via the busbar STS.

[0074] The busbar STS is designed as a split busbar, which has at least, or in this case exactly, two busbar parts, namely a first busbar part T1 and a second busbar part T2. In the fully manufactured state of the wheel hub drive 10, the respective busbar part T1, T2 runs at least partially in the body KR and thus in the second material, in particular in the plastic, in particular such that at least a respective longitudinal region of the respective busbar part T1, T2 is completely surrounded by the second material, in particular by the plastic, along its respective circumferential direction. The second material is preferably an electrical non-conductor, so that the second material is designed as an electrical insulation for the respective busbar part T1, T2. In other words, the respective busbar part T1, T2 is electrically insulated by means of the second material.

[0075] With respect to the cylinder section Z1, the cone section K, and the sleeve H2, for example, the second busbar part T2 runs exclusively in the sleeve H2. The first busbar part T1 runs at least partially in the cone section K. It is conceivable that the first busbar part T1 runs, in particular also partially, in the cylinder section Z1 and / or in the cylinder section Z2, in particular the sleeve H2. The channel 38 belonging to the busbar STS, in which the busbar STS runs in the fully manufactured state of the wheel hub drive 10, is designed, for example, as a bore in the stator carrier 36, in particular of the body KR. In particular, it is conceivable that the busbar part T1 and / or T2 is each at least partially cast in the second material, in particular in the plastic.Very preferably, the second material, in particular a plastic, is designed as a non-conductor, so that the second material serves as an electrical insulator for the busbar part T1 and / or T2. In other words, the busbar part T1 and / or T2 is electrically insulated by means of the second material.

[0076] In the embodiment shown in the figures, the busbar parts T1 and T2 are formed separately from each other and are connected by means of a coupling device 86 ( Fig. 7) are connected to one another at least electrically and preferably also mechanically. Very preferably, the busbar parts T1 and T2 are mechanically connected to one another by means of the coupling device 86 in such a way that the busbar parts T1 and T2 are connected to one another in a non-destructively detachable manner by means of the coupling device 86. In the present case, for example, the busbar parts T1 and T2 are screwed to one another by means of the coupling device 86 and are thereby connected to one another, in particular in a non-destructively detachable manner.

[0077] The coupling device 86 has a first connecting element 88 provided on the busbar part T1, in particular formed by the busbar part T1, and a second connecting element 90 corresponding to the first connecting element 88, provided on the second busbar part T2, in particular formed by the busbar part T2, wherein the connecting elements 88 and 90 are connected to one another, in particular in a non-destructively releasable manner. As a result, the busbar parts T1 and T2 are connected to one another, in particular in a non-destructively releasable manner. Very particularly, the connecting elements 88 and 90 are screwed to one another, in particular in a non-destructively releasable manner, and are thereby connected to one another, in particular in a non-destructively releasable manner. The first connecting element 88 is also referred to as the first coupling half, and the connecting element 90 is also referred to as the second coupling half.For example, the connecting element 88 is cast into the cylinder section Z2, in particular into the sleeve H2. For example, the connecting element 90 is cast into the cylinder section Z2, in particular into the sleeve H2, or the connecting element 90 is cast into the conical section K.

[0078] For example, the first connecting element 88 has a first thread. For example, the connecting element 90 has a second thread corresponding to the first thread, wherein the threads are screwed together, in particular directly, in particular screwed into one another. As a result, for example, the connecting elements 88 and 90 are screwed together, in particular directly.

[0079] In the aforementioned method for assembling or manufacturing the wheel hub drive 10, for example, the conductor rail part T1 is inserted into the stator carrier 36, in particular into the body KR, in particular such that the conductor rail part T1 is inserted into the associated channel 38. Subsequently, the conductor rail part T2 is inserted in the axial direction of the wheel hub drive 10 into the stator carrier 36, in particular the body KR, in particular such that or by inserting the second conductor rail part T2 into the associated channel 38 in the axial direction of the wheel hub drive 10. In addition, the conductor rail part T2 is screwed to the conductor rail part T1 via the threads. Fig. 6 shows that the conductor rail parts T1 and T2 each have a contact cone 92, 94, via which the conductor rail parts T1 and T2 are electrically connected to one another, such that in the fully manufactured state of the wheel hub drive 10, the contact cones 92 and 94 directly abut one another. This means that the contact cones 92 and 94 serve as an electrical line or connection between the conductor rail parts T1 and T2.

[0080] The respective busbar part T1, T2 has a respective conductor LE1, LE2, which is formed from an electrically conductive, in particular metallic, material. In addition, the respective busbar part T1, T2 has a respective carrier TR1, TR2, wherein the respective conductor LE1, LE2 of the respective busbar part T1, T2 is at least partially embedded in the respective carrier TR1, TR2 of the respective busbar part T1, T2. Preferably, the respective carrier TR1, TR2 is designed as an electrically non-conductor, wherein it is particularly conceivable that the respective carrier TR1, TR2 is formed from a plastic. In this case, for example, the respective connecting element 88, 90 is formed by the respective conductor LE1, LE2. Very particularly, the respective conductor LE1, LE2 is designed as a respective solid body. Fig.1 that, for example, the radially inner, first sleeve H1 is a radially outer bearing ring of the wheel bearing device 20, wherein the radially outer bearing ring of the wheel bearing device 20 is fixed to the wheel carrier, i.e. is connected to the wheel carrier 18 in such a way that relative movements between the radially outer bearing ring and the wheel carrier 18 are prevented. The wheel hub sleeve 80 is, for example, a radially inner bearing ring of the wheel bearing device 20, in particular arranged radially within the radially outer bearing ring, wherein, for example, the raceways 64 and 70 are formed by the radially outer bearing ring and the raceways 66 and 72 are formed by the radially inner bearing ring. In particular, the wheel disc 14 is screwed to the radially inner bearing ring of the wheel bearing device 20.The phrase “in a cylinder section” such as, for example, in the cylinder section Z1 or in the cylinder section Z2 and the phrase “in a cone section” such as, for example, in the cone section K means, in particular, in a respective wall of the cylinder section or cone section in question. List of reference symbols 10 Wheel hub drive 12 vehicle wheel 14 Wheel disc 16 rim 18 wheel carriers 20 Wheel bearing device 22 wheel carrier axle 24 electric machine 26 Rotor 27 rotor carrier 28 Stator 30 rotor element 32 Rotor element 34 Double arrow 36 stator carriers 38 first channel 40 high-voltage line 42 second channel 44 third channel 46 Sensor cable 48 Arrow 50 outer circumferential surface 52 Opening 53 Fastening element 54 additional channels 56 rotor cover 58 Rotor carrier section 60 Seal 62 first rolling element 64 first career 66 second career 68 second rolling element 70 third career 72 fourth career 80 wheel hub sleeve 82 wheel hub 84 screw 86 Coupling device 88 first connecting element 90 second connecting element 92 contact cone 94 Contact cone H1 first sleeve H2 second sleeve K Conical section KA1 first canal section KR Body LE1 Ladder LE2 ladder M1 inner circumferential surface M2 outer circumferential surface RL1 first wheel bearing RL2 second wheel bearing S1 page STS busbar T1 first busbar section T2 second busbar section TR1 carrier TR2 carrier Z1 first cylinder section Z2 second cylinder section Z3 third cylinder section QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2022 / 096504 A1

[0002]

Claims

[1] Wheel hub drive (10) for a motor vehicle, comprising a wheel carrier (18), a wheel bearing device (20) having a first wheel bearing (RL1) and a second wheel bearing (RL2), a wheel disc (14) rotatably mounted on the wheel carrier (18) by means of the wheel bearing device (20), an electric machine (24) having a stator (28) and a rotor (26), and a stator carrier (36) by means of which the stator (28) is held in a rotationally fixed manner on the wheel carrier (18), wherein the stator carrier (36) has a first cylinder section (Z1) arranged axially at least partially overlapping the stator (28) and a second cylinder section (Z2) arranged radially within the first cylinder section (Z1) and axially offset from the stator (28), characterized by that the second cylinder section (Z2) is arranged axially between the first wheel bearing (RL1) and the second wheel bearing (RL2). [2] Wheel hub drive (10) according to claim 1, characterized bythat the second cylinder section (Z2) has a radially inner first sleeve (H1) formed from a metallic first material and a radially outer second sleeve (H2) which is formed from a second material different from the first material. [3] Wheel hub drive (10) according to claim 2, characterized by that the first cylinder section (Z1) is formed from the second material and is formed integrally with the radially outer second sleeve (H2). [4] Wheel hub drive (10) according to one of the preceding claims, characterized by that the rotor carrier (36) has a conical section (K) which is arranged axially between the first cylinder section (Z1) and the second cylinder section (Z2). [5] Wheel hub drive (10) according to claim 4 in its dependent claim 2 or 3, characterized bythat the conical section (K) is formed from the second material and is formed integrally with the first cylinder section (Z1) and integrally with the radially outer second sleeve (H2). [6] Wheel hub drive (10) according to claim 4 or 5, characterized by that a split busbar (STS) is provided, via which the electrical machine (24) can be supplied with electrical energy and / or electrical energy can be discharged from the electrical machine (24), wherein a first busbar part (T1) of the busbar (STS) is arranged in the conical section (K) and a second busbar part (T2) of the busbar (STS), which is formed separately from the first busbar part (T1) and is at least electrically connected to the first busbar part (T1), is arranged in the second cylinder section (Z2). [7] Wheel hub drive (10) according to claim 6, characterized bya coupling device (86) which is designed to releasably connect the busbar parts (T1, T2). [8] Wheel hub drive (10) according to claim 7, characterized by that a first coupling half (88, 90) of the coupling device (86) is cast into the conical section (K). [9] Wheel hub drive (10) according to one of claims 6 to 8 in its reference to claim 4 or 5, characterized by that the first busbar part (T1) is cast into the conical section (K), wherein the second material is designed as electrical insulation at least for the first busbar part (T1). [10] Motor vehicle, with at least one wheel hub drive (10) according to one of the preceding claims.

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