Wheel hub drive for a motor vehicle
Patent Information
- Application Number
- PCT/EP2026/052373
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-24
- Filing Date
- 2026-01-29
- Publication Date
- 2026-10-01
Smart Images
Figure EP2026052373_01102026_PF_FP_ABST
Abstract
Description
[0001] Mercedes-Benz Group AG
[0002] Wheel hub drive device for a motor vehicle
[0003] The invention relates to a wheel hub drive device for a motor vehicle according to the preamble of claim 1.
[0004] EP 3225448 A1 discloses a wheel hub drive unit, with a wheel hub having a wheel hub mounting surface.
[0005] US 2016 / 0121709 A1 discloses a wheel hub drive in which a drum brake is arranged radially within an electric machine designed as a radial flux machine, wherein a brake shoe holder of the drum brake is axially attached to a support element on the inside of a vehicle, the support element simultaneously serving to mount a stator of the electric machine. The electric machine of US 2016 / 0121709 A1 is designed as an internal rotor.
[0006] DE 102022200032 A1 also shows a wheel hub drive with a drum brake arranged radially inside an electric machine. Unlike US 2016 / 0121 709 A1, the electric machine of DE 102022200032 A1 is designed as an external rotor.
[0007] DE 102023111 801 A1 and DE 102025000407 A1 disclose wheel hub drives with externally designed electric machines and with radially arranged braking devices within the electric machines, in particular presenting sealing concepts.
[0008] The object of the present invention is to provide a wheel hub drive device such that a particularly space-saving and weight-efficient design of the wheel hub drive device can be achieved. This object is achieved by a wheel hub drive device with the features of claim 1. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.
[0009] The starting point is a wheel hub drive device, also referred to simply as a vehicle, for a motor vehicle. This means that the motor vehicle, preferably designed as a motor vehicle, particularly a passenger car, in its fully manufactured state, has the wheel hub drive device and can be driven by means of the wheel hub drive device, in particular electrically and, most especially, purely electrically. The motor vehicle has, for example, at least or exactly two axles arranged consecutively in the longitudinal direction of the motor vehicle, namely a first axle and a second axle. The axles are also simply referred to as axles. Each axle has at least or exactly two wheels, also simply referred to as wheels.The wheels of each axle are arranged on opposite sides of the vehicle in the transverse direction. The wheels are ground contact elements, allowing the vehicle to be supported or stabilized against the ground in its vertical direction. When the vehicle is driven along the ground while supported by these ground contact elements, the elements roll along the ground, particularly directly.
[0010] The wheel hub drive device is also referred to as the first wheel hub drive device or wheel hub drive. Where the wheel hub drive or wheel hub drive device is mentioned before and below, it refers, unless otherwise specified, to the first wheel hub drive device. The wheel hub drive is also referred to as the first wheel hub drive. Where the wheel hub drive is mentioned before and below, it refers, unless otherwise specified, to the first wheel hub drive, and thus the first wheel hub drive device. The wheel hub drive comprises, in particular, a first of the vehicle wheels of one of the vehicle axles. Where the vehicle wheel is mentioned before and below, it refers, unless otherwise specified, to the first vehicle wheel, and thus the vehicle wheel of the wheel hub drive.Thus, the first wheel of the vehicle can be driven by means of the first wheel hub drive, particularly purely electrically, and most preferably by bypassing, in particular all, other wheels of the vehicle. For example, the motor vehicle in its fully manufactured state has a second wheel hub drive in addition to the first, by means of which, in particular, a second of the vehicle's wheels can be driven, particularly purely electrically. The second wheel hub drive can include the second wheel of the vehicle. Thus, the first wheel of the vehicle is a component of the first wheel hub drive, and preferably the second wheel of the vehicle is a component of the second wheel hub drive. Preferably, the first and second wheels of the vehicle are the wheels of the same vehicle axle, that is, the first or the second axle.The preceding and following explanations 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. The second wheel hub drive is also referred to as the second wheel hub drive assembly. The wheel hub drive assembly (wheel hub drive) comprises a wheel carrier and a wheel bearing, which includes a first bearing race and a second bearing race. The first bearing race is, in particular, permanently and non-rotatably connected to the wheel carrier. The second bearing race is arranged coaxially with the first bearing race and is rotatable about a principal axis of rotation. This means that the second bearing race is rotatable about the principal axis of rotation, also referred to as the axis of rotation, relative to the first bearing race and relative to the wheel carrier. The principal axis of rotation is a wheel axis of rotation, as will be explained in more detail below.For example, the wheel bearing of the wheel hub drive device, whose axial direction coincides with the main axis of rotation, is a rolling bearing. The wheel bearing has, for example, rolling elements by means of which the second bearing shell is rotatably mounted on the first bearing shell about the main axis of rotation (axis of rotation) relative to the first bearing shell and relative to the wheel carrier; that is, it is in particular mounted in a rolling bearing configuration.
[0011] The wheel hub drive device, whose radial direction is perpendicular to the axial direction of the wheel hub drive device and thus perpendicular to the main axis of rotation, also includes an electric machine. Where the radial direction is mentioned before and below, this refers, unless otherwise specified, to the radial direction of the wheel hub drive device. Where the axial direction is mentioned before and below, this refers, unless otherwise specified, to the axial direction of the wheel hub drive device, whose circumferential direction is around the axial direction and thus around the main axis of rotation, and extends in an imaginary plane that is perpendicular to the axial direction and thus perpendicular to the main axis of rotation.
[0012] The electric machine is designed as a radial flux machine (RFM) and is also referred to as a radial flux motor. The electric machine has a rotor and a stator, by means of which the rotor can be driven and thus rotated about a machine axis of rotation relative to the stator. It is conceivable that the machine axis of rotation coincides with the main axis of rotation. In particular, the electric machine can provide drive torques via its rotor for driving the vehicle wheel, especially purely electrically. The stator is, in particular, permanently and non-rotatably connected to the wheel carrier, so that the rotor can rotate about the machine axis of rotation relative to the wheel carrier. By means of the respective drive torque, and thus by means of the electric machine, the second bearing shell can be driven and thus rotated about the main axis of rotation relative to the first bearing shell, relative to the wheel carrier, and relative to the stator.By driving the second bearing shell, the vehicle wheel can be driven by means of or from the second bearing shell and thus rotated about the main axis of rotation relative to the wheel carrier, so that the main axis of rotation is the aforementioned wheel axis of rotation. When the circumferential direction is mentioned before and below, this refers, unless otherwise specified, to the circumferential direction of the wheel hub drive device.
[0013] Preferably, the rotor is non-rotatably connected to, or already connected to, the second bearing shell. In particular, it can be provided that the rotor is permanently non-rotatably connected to the second bearing shell. The vehicle wheel is also permanently non-rotatably connected to the second bearing shell. Thus, the rotor, and therefore the electric machine, can drive the second bearing shell and, via the second bearing shell, the vehicle wheel, particularly electrically, thereby rotating it about the main axis of rotation relative to the wheel carrier, the first bearing shell, and the stator. In other words, by driving the rotor, the second bearing shell, and thus, via the second bearing shell, the vehicle wheel, can be driven, particularly electrically, and thereby rotated about the main axis of rotation relative to the wheel carrier.In particular, the rotor is coupled or can be coupled to the second bearing shell in a torque-transmitting manner, especially by rotating it, whereby the second bearing shell can be driven by the rotor and is thus rotatable about the main axis of rotation relative to the first bearing shell and relative to the wheel carrier. It is also conceivable that the rotor is permanently connected to the second bearing shell in a torque-transmitting manner, especially by permanently rotating it, whereby the second bearing shell can be driven by the rotor and is thus rotatable about the main axis of rotation relative to the first bearing shell.
[0014] The vehicle wheel, which is permanently and rotationally fixed to the second bearing shell, comprises a wheel disc and a rim. The rim is permanently and rotationally fixed to the wheel disc. In principle, it would be conceivable for the rim and the wheel disc to be formed separately and permanently and rotationally fixed to each other, or for the wheel disc and the rim to be formed as a single unit, i.e., made from a single piece and thereby permanently and rotationally fixed to each other. For example, a tire, particularly of the first vehicle wheel and made of rubber, is mounted on the rim, so that the tire is attached to the rim. When the vehicle wheel rolls on the ground, the tire rolls directly against the ground.In particular, it is conceivable that the wheel disc and thus the vehicle wheel are permanently and rotationally fixedly connected to the second bearing shell, so that the vehicle wheel is permanently and rotationally fixedly connected to the second bearing shell via the wheel disc.
[0015] The wheel hub drive device also has a drum brake, by means of which braking can be effected by actuating the drum brake, in particular hydraulically. During or through braking, the second bearing shell, and thus the vehicle wheel, can be braked with respect to rotation about the main axis of rotation relative to the first bearing shell and relative to the wheel carrier. The drum brake comprises a brake drum and a brake shoe. The brake drum is a first braking element within the tolerance range and is also referred to as the first braking element.The first brake element (brake drum) is, in particular permanently, rotationally fixed to the second bearing race and is therefore rotatable with the second bearing race and the vehicle wheel about the main axis of rotation relative to the wheel carrier and relative to the first bearing race. The brake shoe is a second brake element of the drum brake or is also referred to as the second brake element. The second brake element (brake shoe) is connected to the wheel carrier, in particular in a rotationally fixed manner, such that the first brake element is rotatable about the axis of rotation relative to the second brake element. It is conceivable that the brake shoe is, in particular permanently, rotationally fixed to the wheel carrier, in particular at least such that the first brake element is rotatable about the main axis of rotation relative to the second brake element.In particular, the second brake element is coupled to the wheel carrier, and thus held to the wheel carrier, in such a way and at least indirectly, that relative rotations between the second brake element and the wheel carrier about the main axis of rotation are prevented. The first brake element has, for example, a first friction surface, which is formed, for example, by an inner circumferential surface of the brake drum. The second brake element has, for example, at least one second friction surface, which is formed, for example, by an outer circumferential surface of the second brake element. For example, the first friction surface faces inwards in the radial direction. For example, the second friction surface faces outwards in the radial direction. In particular, the friction surfaces face each other in the radial direction, so that, in particular, the friction surfaces are opposite each other in the radial direction.By actuating the drum brake, particularly hydraulically, the friction surfaces in a friction zone of the drum brake can be brought into mutual, friction-fit, and preferably direct, contact, so that the friction surfaces rub against each other, particularly directly, thereby making the second bearing shell and thus the vehicle wheel brakeable, i.e., capable of being slowed down. The friction zone is thus an area in which the friction surfaces can be brought into mutual, friction-fit, and preferably direct contact, also referred to as frictional contact, by actuating the drum brake, particularly hydraulically, so that friction can be generated in the friction zone between the friction surfaces for braking, i.e., slowing down the second bearing shell and thus the vehicle wheel.It is conceivable that the brake shoe is movable along a direction of movement relative to the wheel carrier, whereby by actuating the drum brake, in particular hydraulically, the brake shoe is movable, for example, along the direction of movement and relative to the wheel carrier in such a way that the second friction surface can be moved towards the first friction surface, whereby the friction surfaces can be brought into the aforementioned friction-fit mutual and in particular direct contact, i.e., are movable.
[0016] To implement braking in a particularly space-saving and therefore advantageous manner, the electric machine can be designed as an external rotor, i.e., an external rotor machine. Alternatively or additionally, the friction area of the drum brake can be arranged to overlap axially with the stator. Furthermore, it is conceivable that the friction area of the drum brake is arranged to surround the stator radially. This means, in particular, that at least an axially extending length of the stator, especially the entire axial length of the stator, is surrounded by the friction area at least partially, and in particular completely, circumferentially, over a full 360 degrees.
[0017] In other words, the friction zone extends, for example, at least partially circumferentially, and in particular completely and thus over 360 degrees, at least around the aforementioned length range, and in particular around the entire axial length, of the stator.
[0018] The wheel hub drive device also has a first support element which, with respect to the axial direction related to the main axis of rotation, is arranged on a side of the brake drum facing away from the wheel disc, in particular in the axial direction, the side of which, for example, points away from the wheel disc in the axial direction and towards the wheel carrier.
[0019] The first support element has a first mounting area in which the support element is connected to the wheel carrier, in particular in a rotationally fixed and, most especially, permanently rotationally fixed manner. It is conceivable that the first support element and the wheel carrier are designed separately from each other. The first support element also has a second mounting area in which a brake shoe holder is attached to the first support element, in particular such that the brake shoe holder and the first support element are connected to each other in a rotationally fixed manner, particularly permanently. It would also be conceivable that the brake shoe holder and the first support element are designed separately from each other and are connected to each other in a rotationally fixed and, most especially, permanently rotationally fixed manner by attaching the brake shoe holder to the first support element in the second mounting area of the first support element.Furthermore, it would be conceivable that the brake shoe holder and the first support element are formed in one piece, i.e., integrally formed and thus made from a single component, so that, for example, the brake shoe holder and the first support element are formed by a single-piece body, i.e., formed from a single component and thus as a monoblock. The body comprises the first support element as a first body part and the brake shoe holder as a second body part, wherein the brake shoe holder is integrally formed with the first support element in the second mounting area and thus, for example, branches off or projects from the first support element in the second mounting area, in particular in a direction parallel or oblique to the axial direction and, for example, pointing away from the wheel carrier and towards the wheel disc and / or rim.
[0020] In particular, it is provided that the brake shoe is designed separately from the brake shoe holder and also separately from the first support element, wherein the brake shoe is held on the brake shoe holder in a manner that is movable, in particular bypassing, in particular completely, the first support element, and in particular movable along the direction of movement, so that the brake shoe is movable, in particular along the direction of movement, relative to the brake shoe holder and relative to the first support element and relative to the wheel carrier, in particular by actuating, in particular hydraulically, the drum brake.The feature that the brake shoe is held on the brake shoe bracket completely bypassing the first support element means that a direct attachment of the brake shoe to the first support element is not provided, so that the brake shoe is held on the first support element, in particular exclusively, by means of the brake shoe bracket. This means, in particular, that forces emanating from the brake shoe, especially always, can be transmitted to the first support element via the brake shoe bracket, bypassing the first support element, so that the forces emanating from the brake shoe cannot be transmitted from the brake shoe to the first support element bypassing the brake shoe bracket. The brake shoe bracket is also referred to as a brake shoe carrier or brake shoe holder.
[0021] In order to achieve a particularly space-saving and weight-efficient design for the wheel hub drive device, it is provided, in a manner known per se, that the first support element has a third mounting area in which a stator carrier is attached to the first support element. In principle, it would be conceivable for the stator carrier and the first support element to be designed separately and connected to each other, in particular in a rotationally fixed and especially permanently rotationally fixed manner, by attaching the stator carrier to the first support element in the third mounting area, or vice versa.Alternatively, it would be conceivable that the stator support and the first support element are formed integrally, that is, as a single piece, and thus formed from a single unit. For example, the aforementioned body, or a second body formed integrally, that is, as a single unit and thus as a monoblock, could form the stator support and the first support element, particularly such that the first support element is a first part of the second body and the stator support is a second part of the second body. If the aforementioned body forms the first support element and the stator support, then, for example, the stator support is a third part of the body. In particular, it is conceivable that the first part is the first part of the body.
[0022] Furthermore, according to the invention, the third fastening area of the first support element is arranged radially outside the second fastening area.
[0023] Since the electric machine is preferably designed as an external rotor and thus preferably as an external radial flux machine, the stator, for example, is connected to the wheel carrier on its radially inner side, and the rotor, in particular a magnetic region of the rotor, in whose magnetic region magnets of the rotor, also referred to as rotor magnets and in particular designed as permanent magnets, are arranged, is arranged radially outside the stator, in particular radially outside a winding region of the stator. The winding region of the stator is understood to mean the following: The stator has, for example, at least one winding, also referred to as the stator winding, wherein at least a partial region of the winding is arranged in the winding region.A magnetic field can be generated by means of the winding, in particular by supplying the winding with electric current, by means of which the rotor can be driven and thus rotated about the axis of rotation relative to the stator, in particular by the interaction of the rotor magnets, also referred to as rotor magnets, with the magnetic field, which is designed or can be provided, in particular as a rotating field. For example, the stator is or comprises, in particular at least or exactly, a laminated core, also referred to as a stator core, to which the stator winding, which is designed separately from the stator core, is attached, so that the stator winding is supported by the stator core.Furthermore, it is conceivable that the rotor, in particular at least or exactly, is or comprises a laminated core, also referred to as a rotor lamination stack, to which the rotor magnets, which are formed separately from the rotor lamination stack, are attached, so that the rotor magnets are supported by the rotor lamination stack. In particular, the rotor magnets are arranged at least partially within the magnetic area of the rotor.
[0024] The stator support is preferably, and in particular permanently, connected to the stator in a rotationally fixed manner, so that the stator is supported by the stator support. For example, the stator and the stator support are designed separately from each other and, in particular, permanently connected to each other in a rotationally fixed manner. Furthermore, it is conceivable that the electric machine has a rotor support, which is, in particular, permanently connected to the rotor in a rotationally fixed manner. In particular, it is conceivable that the rotor and the rotor support are designed separately from each other and, in particular, permanently connected to each other in a rotationally fixed manner. Most importantly, the stator, in particular in contrast to the stator support, is a magnetically active element by means of which, for example, a magnetic flux, in particular of the magnetic field, is to be guided and / or the magnetic field can be generated.Accordingly, it is preferably provided that the rotor, in particular in contrast to the rotor carrier, is a magnetically effective element by means of which the magnetic flux of the magnetic field can be guided. Preferably, the electric machine is a high-voltage component whose electrical voltage, in particular its operating or rated voltage, is preferably greater than 50 volts, particularly greater than 60 volts, and most preferably several hundred volts.
[0025] The first bearing race is, for example, a radially outer and wheel carrier-fixed bearing ring of the wheel bearing. The second bearing race is, for example, a radially inner bearing ring of the wheel bearing. The vehicle wheel is, for example, permanently and rotationally connected to the second bearing race in such a way that the vehicle wheel, in particular the wheel disc, is bolted to the second bearing race.
[0026] For example, the first support element extends at least substantially in the radial direction. In other words, the first support element, considered on its own, is at least substantially planar and / or plate-shaped and / or disc-shaped, such that preferably the first support element, considered on its own, extends at least substantially in an imaginary plane perpendicular to the axial direction. In particular, the first support element can have a plate shape or a plate shape with gaps. The first support element can be directly connected to the wheel carrier, or the first support element can be indirectly connected to the wheel carrier.
[0027] Within the scope of this 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 in a radially overlapping manner, especially with respect to a common axis extending, for example, in the radial direction and / or in the radial direction, particularly with respect to each other, if they are each arranged at least partially in a region of the same radial coordinates, in particular the same angular coordinates, wherein the radial coordinates extend in the radial direction and in particular begin at the axis of rotation and increase, for example, radially outwards. The term "radial" refers to the radial direction. In other words, the term "radial" means the radial direction.
[0028] The feature "axially overlapping" means the following: Two elements, such as the friction area and the stator, are arranged axially overlapping with respect to a common axis, particularly one extending in the axial direction, and / or in the axial direction, particularly with respect to each other, if they are each arranged at least partially in a region of identical axial coordinates, wherein the axial coordinates extend in the axial direction. Within the scope of this disclosure, the term "axial" is to be understood as referring to the axial direction. In other words, the term "axial" means the axial direction. Put another way, "axial" refers to the axial direction, and "radial" refers to the radial direction.
[0029] Within the scope of this disclosure, the feature that a first component, such as the second mounting area, is arranged radially within a second component, such as the third mounting area, is understood to mean that the first component is arranged in a region of smaller radii than the second component, particularly with respect to the axis of rotation. The aforementioned radii extend in the radial direction and begin, for example, at the axis of rotation (main axis of rotation) and increase radially outwards. Within the scope of this disclosure, the feature that a first component, such as the third mounting area, is arranged outside a second component, such as the second mounting area, is understood to mean that the first component is arranged in a region of larger radii than the second component, particularly with respect to the axis of rotation (main axis of rotation).
[0030] The term "stator" refers specifically and at least to the stator winding, i.e., the winding section. The stator and the stator support, for example, form a stator assembly that includes both the stator and the stator support. The term "rotor" thus refers specifically and at least to the rotor magnets of the rotor, particularly the magnetic section of the rotor. For example, the rotor and the rotor support form a rotor assembly that includes both the rotor and the rotor support.
[0031] Within the scope of the present disclosure, the feature that two components are rotationally fixed to one another is understood to mean that the components connected in such a rotationally fixed manner are arranged coaxially to one another and, in particular when the components are driven, rotate together or simultaneously about a common axis of rotation of the components, such as the main axis of rotation, at the same angular velocity, especially relative to a reference element such as the wheel carrier. In other words, two components are rotationally fixed to one another if they are arranged coaxially to one another, especially with respect to their axis of rotation 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 rotationally fixed to the wheel carrier if it cannot be rotated relative to the wheel carrier. Put another way, the term "rotationally fixed" means the following: Two elements, particularly those mounted for rotation, are rotationally fixed to each other if they are arranged coaxially and connected in such a way that they rotate at the same angular velocity, especially about the element's axis of rotation and / or relative to the reference element. Put yet another way, two elements are rotationally fixed to each other if they are arranged coaxially, especially with respect to their element's axis of rotation and / or with respect to a rotational symmetry axis, and if they are connected in such a way that they always rotate at the same angular velocity.
[0032] The characteristic that two components are permanently connected or coupled to each other in a rotationally fixed manner means that a switching element is not provided which can be switched between a coupling state in which the components are connected or coupled in a rotationally fixed manner and a decoupling state in which the components are decoupled from each other and rotatable relative to each other, so that no torques can be transmitted between the components via the switching element, but rather the components are always, i.e., permanently, rotationally fixed to each other.
[0033] In order to keep the installation space requirement of the wheel hub drive particularly low, it is provided according to the invention that the rotor carrier is arranged radially outside the stator and axially overlapping the stator.
[0034] Furthermore, according to the invention, the rotor carrier has a rotor cover which is arranged on a side of the stator facing away from the wheel disc, particularly in the axial direction. This allows for a particularly space-saving design.
[0035] To minimize the installation space required for the wheel hub drive device, one embodiment of the invention provides that the brake drum is arranged radially inside the stator and axially overlapping the stator. Another embodiment is characterized in that the brake shoe holder is attached to the first support element by at least one screw connection, preferably directly or indirectly. Thus, it is preferably provided that the brake shoe holder is designed separately from the first support element and is connected to it in such a way, particularly in a rotationally fixed manner and especially permanently, that the brake shoe holder is screwed to the first support element and thereby attached to it. This ensures a compact design and advantageous assembly or manufacturing of the wheel hub drive.
[0036] An alternative embodiment to the bolted brake shoe holder is characterized by the fact that the brake shoe holder has an axial spacer element, which is also referred to as an axial spacer element and is formed integrally with the first support element. In particular, for example, at least a portion of the brake shoe holder is axially spaced from the first support element by means of the axial spacer element, thereby enabling an advantageous, space-saving design of the wheel hub drive device.
[0037] In a further embodiment of the invention, the rotor carrier cover is detachably connected to a base element of the rotor carrier, particularly in a non-destructive manner. This means that the base element is a first component of the rotor carrier and the rotor cover is a second component of the rotor carrier, wherein the components of the rotor carrier are formed separately from one another and are detachably connected to each other, particularly in a non-destructive manner. In particular, the components of the rotor carrier are, for example, screwed together and thereby detachably connected to each other, particularly non-destructively and thus reversibly. It is particularly conceivable that the rotor is directly connected to the base element and thereby permanently and rotationally fixed to the base element.
[0038] This allows for a particularly compact design of the wheel hub drive. In order to seal at least a portion of the wheel hub drive device in a particularly space-saving manner, a seal is provided in a further embodiment of the invention. This seal is made, for example, of an elastomer, particularly rubber, and is therefore particularly elastic, especially rubber-elastic, and deformable. The seal is arranged, in particular radially and / or axially, between the stator carrier and the rotor carrier cover.
[0039] Another embodiment is characterized by a second support element which is, in particular, permanently and rotationally fixed to the wheel disc and thus to the vehicle wheel. In particular, the second support element is designed separately from the wheel disc and thus separately from the vehicle wheel and is, in particular, permanently and rotationally fixed to the wheel disc and thus to the vehicle wheel. The second support element is arranged axially between the wheel disc and the stator. It is preferably provided that the rotor carrier is permanently and rotationally fixed to the second support element at a radially outer, in particular outermost, edge of the second support element.It is conceivable that at least part of the rotor support, in particular the base element, or the rotor support itself, is formed in one piece, that is, integrally with the second support element, so that, for example, the second support element and at least that part of the rotor support, in particular the base element, or the rotor support, are formed from a single piece. Thus, for example, the second support element and at least that part of the rotor support, in particular the base element, or the rotor support, are formed by a third body that is formed in one piece, that is, integrally and thus formed from a single piece and therefore as a monoblock, which includes the second support element as a fourth body part and at least that part of the rotor support, in particular the base element, or the rotor support itself as a fifth body part.Alternatively, it would be conceivable that the second support element and at least that part of the rotor carrier, in particular the base element, or the rotor carrier itself, are designed separately from one another and are connected to each other in a rotationally fixed manner, particularly by bolting the second support element and at least that part of the rotor carrier, in particular the base element, or the rotor carrier together. This would allow for a particularly space-saving and weight-efficient design of the wheel hub drive device.
[0040] Further advantages, features, and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and combinations of features mentioned above in the description, as well as those mentioned below in the figure description and / or shown in the figures alone, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention.
[0041] The drawing shows in the single Fig. 1 a partial schematic sectional view of a wheel hub drive device of a motor vehicle.
[0042] In the figures, identical or functionally equivalent elements are provided with the same reference symbols.
[0043] Figure 1 shows a partial schematic longitudinal sectional view of a wheel hub drive device 10, also referred to as a wheel hub drive or wheel hub drive assembly, of a motor vehicle, also referred to simply as a vehicle. The wheel hub drive device 10 (wheel hub drive) comprises a wheel carrier 12 and a vehicle wheel 14 of the motor vehicle, wherein the vehicle wheel 14 is also referred to as a wheel and is rotatably mounted and thus held on the wheel carrier 12 about a pivot axis 16, also referred to as the main axis of rotation or wheel axis of rotation, relative to the wheel carrier 12. For this purpose, the wheel hub drive, whose axial direction coincides with the pivot axis 16, has a wheel bearing 18, which has a first bearing shell 20 and a second bearing shell 22. The bearing shell 20 is connected to the wheel carrier 12 in a rotationally fixed manner, in particular permanently, for example by being screwed to the wheel carrier 12.The bearing shell 22 is arranged coaxially and rotatably with respect to the bearing shell 20, such that the bearing shell 22 is rotatably mounted on the bearing shell 20 about the axis of rotation 16 relative to the bearing shell 20 and relative to the wheel carrier 12. For this purpose, the wheel bearing 18 of the wheel hub drive, whose radial direction is perpendicular to the axial direction of the wheel hub drive and thus perpendicular to the axis of rotation 16, has first rolling elements 24 and second rolling elements 26. A first raceway and a second raceway are provided on the bearing shell 20, in particular such that the first raceway and the second raceway are permanently and rotationally fixed to the bearing shell 20. For example, the first raceway and the second raceway are formed integrally with the bearing shell 20, so that preferably the first raceway, the second raceway, and the bearing shell 20 are formed from a single piece.A third raceway and a fourth raceway are provided on the bearing shell 22, for example by or in such a way that the third raceway and the fourth raceway are permanently connected to the second bearing shell 22 in a rotationally fixed manner.
[0044] For example, the third raceway and the fourth raceway are formed in one piece with the bearing shell 22, so that, for example, the third raceway, the fourth raceway and the bearing shell 22 are formed from a single piece.
[0045] The rolling elements 24 form a first rolling element ring in which the rolling elements 24 are arranged successively in the circumferential direction of the wheel hub drive, the circumferential direction of which runs around the axial direction of the wheel hub drive and thus around the axis of rotation 16. The circumferential direction of the wheel hub drive runs around the axis of rotation 16 and thus around the axial direction of the wheel hub drive and extends in an imaginary plane perpendicular to the axis of rotation 16, the circumferential direction of the wheel hub drive being illustrated by a double arrow 28. Where the axial direction is mentioned before and below, this refers, unless otherwise specified, to the axial direction of the wheel hub drive. Where the radial direction is mentioned before and below, this refers, unless otherwise specified, to the radial direction of the wheel hub drive.Whenever the circumferential direction is mentioned before and below, this refers, unless otherwise specified, to the circumferential direction of the wheel hub drive. The rolling elements 26 form a second rolling element ring in which the rolling elements 26 are arranged consecutively in the circumferential direction. The rolling element rings are arranged consecutively in the axial direction and thus one behind the other. When the bearing shell 22 rotates about the axis of rotation 16 and relative to the bearing shell 20 and thus relative to the wheel carrier 12, the rolling elements 24 roll, in particular directly, on the first and third raceways, and the rolling elements 26 roll, in particular directly, on the second and fourth raceways. Thus, the wheel bearing 18 is or forms a rolling bearing by means of which the vehicle wheel 14 is rotatably mounted on the wheel carrier 12 about the axis of rotation 16 relative to the wheel carrier 12."Axial" refers to the axial direction, and "radial" refers to the radial direction.
[0046] The wheel hub drive (wheel hub drive device 10) also includes an electric machine 30, which is designed as an externally running radial flux machine and thus as an external rotor. The electric machine 30 has a stator 32 and a rotor 34, which can be driven by means of the stator 32 and is thereby rotatable about the axis of rotation 16 relative to the stator 32 and relative to the wheel carrier 12. The stator 32 is or comprises at least one winding, also referred to as a stator winding, by means of which a magnetic field, in particular a rotating field, can be generated. The rotor 34 can be driven by means of the magnetic field. The rotor 34 is or comprises magnets, also referred to as rotor magnets, and preferably designed as permanent magnets, which are configured to interact with the magnetic field, thereby driving the rotor 34 and thus making it rotatable about the axis of rotation 16 (main axis of rotation) relative to the stator 32 and relative to the wheel carrier 12.The stator 32 is connected to the wheel carrier 12 in a rotationally fixed manner, particularly permanently. For this purpose, a stator support 36 is provided, which is formed separately from the stator 32 and is connected to the stator 32 in a rotationally fixed manner, particularly permanently. In the embodiment shown in Fig. 1, the stator support 36 is formed separately from the wheel carrier 12 and is connected to the wheel carrier 12 in a rotationally fixed manner, at least indirectly and in particular permanently, particularly by being screwed to the wheel carrier 12 at least indirectly. Furthermore, it is conceivable that the stator 32 is or comprises a first laminated core, also referred to as a stator core, such that the laminated core is formed separately from the winding and connected to the winding, so that the winding of the stator 32 is supported by the stator laminated core.In particular, the winding of the stator 32 and the stator lamination stack are designed separately from the stator support 36 and are connected, in particular directly, in a rotationally fixed manner, in particular permanently rotationally fixed to the stator support 36.
[0047] The electric machine 30 also has a rotor carrier 38, which is formed separately from the rotor 34 and is, in particular, permanently and rotationally fixed to the rotor 34. It can be seen that the stator 32 is connected, in particular, permanently and rotationally fixed to the wheel carrier 12 via the stator carrier 36. The rotor 34 is connected, in particular, permanently and rotationally fixed to the second bearing shell 22. In the present case, the rotor 34 is connected, in particular, permanently and rotationally fixed to the bearing shell 22 via the rotor carrier 38. In the present case, the rotor carrier 38 is formed separately from the bearing shell 22 and is connected, in particular at least indirectly, rotationally fixed, in particular permanently and rotationally fixed, to the bearing shell 22, for example, by means of the rotor carrier 38 being at least indirectly screwed to the bearing shell 22. The rotor 34 is or comprises, for example, a laminated core, also referred to as a rotor lamination stack.For example, the rotor magnets are formed separately from the rotor lamination stack and connected to it, and thus supported by the rotor lamination stack. In particular, the rotor magnets and, for example, the rotor lamination stack are formed separately from the rotor carrier 38 and are, in particular, permanently and rotationally connected to the rotor carrier 38.
[0048] The vehicle wheel 14 has a wheel disc 40 and a rim 42, onto which, for example, a tire is mounted. It can be seen that the wheel disc 40, and thus the vehicle wheel 14 via the wheel disc 40, is connected to the second bearing shell 22, in particular permanently, in a rotationally fixed manner, for example, such that the wheel disc 40, and thus the vehicle wheel 14, is screwed to the bearing shell 22 via the wheel disc 40.
[0049] The wheel hub drive (wheel hub drive device 10) also has a drum brake 44 by means of which braking can be effected, i.e., carried out. During or through braking, the bearing shell 22 and thus the vehicle wheel 14 can be braked, i.e., slowed down, from rotation about the axis of rotation 16 and relative to the wheel carrier 12. The drum brake 44 has a brake drum 46 as the first braking element and a brake shoe 48 as the second braking element. The brake drum is connected to the bearing shell 22 and the vehicle wheel 14 in a rotationally fixed manner, particularly at least indirectly, and in particular permanently rotationally fixed, for example by means of the brake drum 46 being bolted at least indirectly to the bearing shell 22 and the vehicle wheel 14.The brake shoe 48 is connected to the wheel carrier 12 in such a way that relative rotations between the brake shoe 48 and the wheel carrier 12, at least about the axis of rotation 16, are prevented. It is conceivable that the brake shoe 48 is movable, and in particular pivotable, relative to the wheel carrier 12 and relative to the brake drum 46, especially along a direction of movement, particularly in order to bring a first friction surface of the brake drum 46 and a second friction surface of the brake shoe 48 into mutual frictional and direct contact. This enables braking. The wheel hub drive has a first support element 50, which extends at least substantially over a surface and thus in a disc-like or plate-like shape in an imaginary first plane that runs perpendicular to the axis of rotation 16 and thus perpendicular to the axial direction.The first support element 50 is arranged in an axial direction on a side S1 of the brake drum 46 that is axially away from the wheel disc 40.
[0050] The support element 50 has a first fastening area B1 in which the first support element 50 is connected to the wheel carrier 12, in particular in a rotationally fixed and, more importantly, permanently rotationally fixed manner. In the present case, the support element 50 is designed separately from the wheel carrier 12 and is connected to the wheel carrier 12 in the fastening area B1, in particular in a rotationally fixed and, more importantly, permanently rotationally fixed manner, such that the fastening area B1 of the first support element 50 is screwed to the wheel carrier 12.
[0051] The first support element 50 has a second mounting area B2 in which a brake shoe holder 52, also referred to as a brake shoe carrier or brake shoe holder, is attached to the first support element 50, in particular such that the brake shoe holder 52 and the support element 50 are permanently and rotationally fixedly connected to each other. The second mounting area B2 is arranged radially outside the first mounting area B1, with the mounting areas B1 and B2 being radially, in particular completely, spaced apart from each other.
[0052] The brake shoe 48 is, for example, movable, and in particular pivotable, relative to the brake shoe holder 52, the support element 50, and the wheel carrier 12, particularly along the direction of movement, such that the brake shoe 48 is held on the first support element 50 by means of the brake shoe holder 52. In particular, it is provided in this case that the brake shoe 48 is not held on the brake shoe holder 52 via the support element 50; that is, it is prevented and therefore not provided.
[0053] In particular, the brake shoe 48 is formed separately from the brake shoe holder 52 and is held on the brake shoe holder 52 in a manner movable, and in particular pivotable, position, especially along the direction of movement. In the embodiment shown in Fig. 1, the brake shoe holder 52 and the support element 50 are formed separately from one another and are connected to each other, in particular by rotation and, most importantly, by permanent rotation, such that the brake shoe holder 52 is connected to the support element 50 in the mounting area B2. In the embodiment shown in Fig. 1, the brake shoe holder 52 is detachably connected to the support element 50 in the mounting area B2, in particular non-destructively and thus reversibly, in this case such that the support element 50 and the brake shoe holder 52 are screwed together in the mounting area B2. This means that in the embodiment shown in Fig.In the embodiment shown in Figure 1, at least one screw connection with at least or exactly one screw element 54 is arranged in the fastening area B2, wherein the brake shoe holder 52 is screwed to the support element 50 in the fastening area B2 by means of the screw connection and is thereby detachably connected without damage.
[0054] It is also apparent that the brake shoe holder 52 extends from the mounting area B2 of the support element 50, and thus from the support element 50 within the mounting area B2, in a direction of projection that is oblique or, in this case, parallel to the axial direction, whereby, in this case, the direction of projection points away from the wheel carrier 12 and towards the wheel disc 40, starting from the mounting area B2. For this purpose, the brake shoe holder 52 has an axial spacer element 57, which extends from the mounting area B2 essentially in an axial direction towards the wheel disc 40.
[0055] In an alternative embodiment not shown, the brake shoe holder 52, or at least its axial spacer element 57, and the support element 50 may be formed in one piece, i.e., integrally and thus from a single component. In this embodiment, the brake shoe holder 52 is, so to speak, integrally formed with the mounting area B2 of the support element 50, and thus within the mounting area B2, specifically such that, even in this embodiment, the brake shoe holder 52 projects from the mounting area B2, and thus from the support element 50 within the mounting area B2, in the aforementioned projection direction.To achieve a particularly lightweight and space-saving design for the wheel hub drive device 10, the first support element 50 is provided with a third mounting area B3 in which the stator support 36 is attached to the first support element 50, thereby connecting the stator support 36 and the support element 50, in particular in a rotationally fixed and, most importantly, permanently rotationally fixed manner. The third mounting area B3 is arranged radially outside the second mounting area B2 and radially outside the first mounting area B1, with the second mounting area B2 being arranged radially outside the mounting area B1 and radially inside the mounting area B3. In particular, the mounting area B3 is completely radially spaced from the mounting area B2 and completely from the mounting area B1.
[0056] It is evident that, while the support element 50 extends at least substantially in a planar fashion, and thus, for example, at least substantially in a disc- or plate-like form in the aforementioned imaginary first plane, the stator support 36 projects from the support element 50 in an oblique or, in this case, parallel direction to the axial direction. In the embodiment shown in Fig. 1, the direction of extension points away from the wheel carrier 12 and towards the wheel disc 40. In the embodiment shown in Fig. 1, the stator support 36 is a cylindrical section which is cylindrical on its inner and / or outer circumference and thus in the form of a first straight circular cylinder. The first central axis of this cylinder, also referred to as the first cylinder axis, is rotationally symmetrical with respect to the first straight circular cylinder and coincides with the axis of rotation 16.The stator 32 is connected to an outer circumferential, radially outward-pointing surface of the cylinder section, which is also referred to as the first cylinder section.
[0057] In the embodiment shown in Fig. 1, the stator support 36 and the support element 50 are formed in one piece, i.e., integrally formed and thus made from a single component. The stator support 36 is, in effect, integrally formed with the support element 50 at the mounting area B3, such that the stator support 36 projects from the mounting area B3 and thus from the support element 50, particularly in the direction of extension. Alternatively, it would be conceivable for the stator support 36 to be formed separately from the support element 50 and connected to it at the mounting area B3, particularly by rotation and especially by permanent rotation, and in particular by being detachably connected without damage, for example, by screwing the stator support 36 to the support element 50 at the mounting area B3.Even then, the stator support 36 would, so to speak, project from the mounting area B3 and thus from the support element 50 in the aforementioned direction of extension, i.e., branch off. It can be seen that the stator support 36 is arranged radially inside the stator 32 and axially overlapping the stator 32.
[0058] The brake drum 46 is arranged radially inside the stator 32 and radially inside the stator carrier 36 and axially overlapping with the stator 32 and axially overlapping with the stator carrier 36.
[0059] The aforementioned screw connection comprising screw element 54 is designated 56. For example, screw element 54 is a screw which has an external thread.
[0060] The rotor carrier 38 is arranged radially outside the stator 32 and the stator support 36 and axially overlapping the stator 32 and the stator support 36. In the embodiment shown in Fig. 1, the rotor carrier 38 has a base element 58 as the first component and a rotor carrier cover 60 as the second component. It can be seen that the base element 58 is arranged radially outside the stator 32 and the stator support 36 and axially overlapping the stator 32 and the stator support 36. The base element 58 is or forms a second cylindrical section, which is cylindrical on the inner and / or outer circumference and thus in the form of a second right circular cylinder, whose second central axis, also referred to as the second cylinder axis, is rotationally symmetrical with respect to the second right circular cylinder and coincides with the axis of rotation 16.In the present case, the rotor 34 is connected to an inner circumferential and, in particular, cylindrical surface of the base element 58.
[0061] The rotor carrier cover 60 is designed separately from the base element 58 and is, in particular, permanently and rotationally fixed to the base element 58. The rotor carrier cover 60 is arranged on a side S2 of the stator 32 facing away from the wheel disc 40 axially.
[0062] In the embodiment shown in Fig. 1, the rotor cover 60 is detachably connected to the base element 58, in particular in a non-destructive and thus reversible manner, in this case such that the rotor cover 60 is screwed to the base element 58 by means of at least one screw connection 62.
[0063] The wheel hub drive also includes a seal 64, which is arranged, in particular axially and / or radially, between the stator carrier 36 and the rotor carrier cover 60. A radially outward-facing, and in particular cylindrical, outer surface of the stator carrier 36 forms, for example, a running surface for the seal 64. The seal 64 is held, for example, on the rotor carrier cover 60 and is thus rotatable with the rotor 34 and the rotor carrier 38 about the axis of rotation 16 relative to the stator carrier 36, so that when the rotor carrier 38 and thus the seal 64 rotate about the axis of rotation 16 relative to the stator carrier 36, the seal 64 slides, in particular directly, along the running surface, i.e., slides on the running surface.
[0064] The wheel hub drive device 10 has a second support element 66, which extends at least substantially in a planar, and thus plate- or disc-shaped, form in an imaginary second plane perpendicular to the axial direction. The first plane and the second plane are, for example, spaced apart from each other in the axial direction. The second support element 66 is formed separately from the support element 50 and is connected to the support element 50 at least indirectly and, in particular, permanently, in a rotationally fixed manner. The support element 66 is connected, in particular, permanently, or connectable to the wheel disc 40 in a rotationally fixed manner. In the embodiment shown in Fig. 1, the support element 66, which is formed separately from the vehicle wheel 14, is connected, in particular, permanently, in a rotationally fixed manner to the wheel disc 40 and to the vehicle wheel 14. The second support element 66 is arranged axially between the wheel disc 40 and the stator 32.It is evident that the rotor carrier 38, in particular the base element 58, is connected to the second support element 66, in particular permanently, in a rotationally fixed manner at a radially outer, in particular outermost, edge R of the support element 66. The edge R thus forms a fourth mounting area of the support element 66, wherein the rotor carrier 38, in particular the base element 58, is attached to the support element 66 in this fourth mounting area, in particular such that the rotor carrier 38 and the support element 66 are connected to each other, in particular permanently, in a rotationally fixed manner. In the figure shown in Fig.In the embodiment shown in Fig. 1, the base element 58 and the support element 66 are formed in one piece, i.e., integrally formed and thus made from a single piece, so that the base element 58 is, so to speak, integrally formed at the edge R and thus, for example, at the fourth mounting area, at the support element 66, in particular such that the base element 58 projects from the edge R and thus, for example, at the fourth mounting area, from the support element 66 in a direction that runs obliquely or parallel to the axial direction, i.e., branches off from it. In the embodiment shown in Fig. 1, the direction of projection extends from the edge R and thus, for example, from the fourth mounting area, away from the wheel disc 40 and towards the wheel carrier 12.In the present case, the rotor carrier cover 60 is designed separately from the carrier element 66 and also separately from the base element 58 and is, in particular, permanently, as in the present case, detachable without destruction, rotationally fixed to the base element 58 and via this to the carrier element 66.
[0065] In a further embodiment, the base element 58 is formed separately from the support element 66. In this case, for example, the base element 58 is attached to the support element 66 at the edge R, and thus in the fourth attachment area, such that the base element 58 is connected to the support element 66, particularly in a non-destructive manner, and especially in a rotationally fixed manner, and most importantly permanently. Even then, the base element 58 would project from the edge R, and thus from the support element 66 in the fourth attachment area, in the direction of travel. For example, it is conceivable that the base element 58 is screwed to the edge R and thus bolted to the support element 66 in the fourth attachment area, and thereby connected to the support element 66, particularly in a non-destructive manner.
[0066] The wheel hub drive further comprises a third support element 68, which in this case is formed separately from the support elements 50 and 66 and is at least indirectly and rotationally fixed, in particular permanently rotationally fixed, to the respective support element 50, 66. In this case, the third support element 68 extends at least substantially over a surface and thus in a plate- or disc-like manner in an imaginary third plane, which runs perpendicular to the axial direction and is spaced apart from the first plane and from the second plane. In this case, the support element 68 is arranged axially between the support element 66 and the support element 50. The brake drum 46 is, in particular permanently, rotationally fixed to the support element 68. In the case shown in Fig.In the embodiment shown in Figure 1, the brake drum 46 is formed separately from the support element 68 and is connected to the support element 68 in a rotationally fixed manner, particularly permanently, such that the brake drum 46 is screwed to the support element 68. In the present embodiment, the brake drum 46 is screwed to the support element 68 by means of at least one screw connection 70. In a further embodiment, it would be conceivable that the brake drum 46 and the support element 68 are formed integrally, i.e., as a single piece, and thus are connected to each other in a rotationally fixed manner, particularly permanently. It can be seen that the brake drum 46 projects from the support element 68 in a brake drum projection direction that runs obliquely or, in the present case, parallel to the axial direction, wherein the brake drum projection direction points away from the wheel disc 40 and towards the wheel carrier 12, starting from the support element 68. (Reference numeral list.)
[0067] 10 Wheel hub drive device 12 Wheel carrier
[0068] 14 vehicle wheel
[0069] 16 axis of rotation
[0070] 18 wheel bearings
[0071] 20 first bearing shell
[0072] 22 second bearing cup
[0073] 24 rolling elements
[0074] 26 rolling elements
[0075] 28 Double Arrow
[0076] 30 electric machine
[0077] 32 Stator
[0078] 34 Rotor
[0079] 36 stator carriers
[0080] 38 rotor carriers
[0081] 40 wheel disc
[0082] 42 rim
[0083] 44 Drum brake
[0084] 46 Brake drum
[0085] 48 brake shoe
[0086] 50 first support element
[0087] 52 Brake shoe holder
[0088] 54 screw element
[0089] 56 Screw connection
[0090] 57 Axial spacer element 58 Base element
[0091] 60 Rotor carrier covers
[0092] 62 Screw connection
[0093] 64 Seal
[0094] 66 second support element
[0095] 68 third support element
[0096] 70 screw connection
[0097] B1 first mounting area B2 second mounting area B3 third mounting area R edge
Claims
Mercedes-Benz Group AG Patent claims 1. Wheel hub drive device (10) for a motor vehicle, comprising a wheel carrier (12), a wheel bearing (18) which has a first bearing shell (20) rotationally fixed to the wheel carrier (12) and a second bearing shell (22) arranged coaxially and rotatably about a main axis of rotation (16) with respect to the first bearing shell (20), an electric machine (30) designed as a radial flux machine which has a rotor (34) and a stator (32) rotationally fixed to the wheel carrier (12), a vehicle wheel (14) which is rotationally fixed to the second bearing shell (22) and has a wheel disc (40) and a rim (42), a drum brake (44) which has a brake drum (46) and a brake shoe (48), and a first support element (50) which, with respect to an axial direction related to the main axis of rotation (16), is on a side (S1) facing away from the wheel disc (40) the brake drum (46) is arranged, wherein: - the first support element (50) is rotationally fixed to the wheel carrier (12) in a first mounting area (B1) of the first support element (50), - a second mounting area (B2) of the first support element (50), in whose second mounting area (B2) a brake shoe holder (52) is attached to the first support element (50), is arranged radially outside the first mounting area (B1), and - a third mounting area (B3) of the first support element (50), in whose third mounting area (B3) a stator support (36) is attached to the first support element (50), is arranged radially outside the second mounting area (B2), characterized by the fact that a rotor carrier (38) is arranged radially outside the stator (32) and axially overlapping the stator (32), wherein a rotor carrier cover (60) of the rotor carrier (38) is arranged on one side (S2) of the stator (32) facing axially away from the wheel disc (40).
2. Wheel hub drive device (10) according to claim 1, characterized by the fact that the brake drum (46) is arranged radially inside the stator (32) and axially overlapping the stator (32).
3. Wheel hub drive device (10) according to claim 1 or 2, characterized by the fact that the brake shoe holder (52) is attached to the first support element (50) by a screw connection (56).
4. Wheel hub drive device (10) according to claim 1 or 2, characterized by the fact that the brake shoe holder (52) has an axial spacer element (57) which is formed integrally with the first support element (50).
5. Wheel hub drive device (10) according to one of the preceding claims, characterized in that the rotor carrier cover (60) is detachably connected to a base element (58) of the rotor carrier (38).
6. Wheel hub drive device (10) according to one of the preceding claims, characterized by a seal (64) arranged between the stator carrier (36) and the rotor carrier cover (60).
7. Wheel hub drive device (10) according to one of the preceding claims, characterized by a second support element (66) which is connected or connectable to the wheel disc (40) in a rotationally fixed manner and is arranged axially between the wheel disc (40) and the stator (32), wherein the rotor support (38) is connected to the second support element (66) in a rotationally fixed manner at a radially outer edge (R) of the second support element (66).