Wheel hub drive for a motor vehicle

Abstract

The invention relates to a wheel hub drive (1) for a motor vehicle, having - a wheel carrier (2), - a wheel bearing (3) which has a first bearing shell (4) rotationally fixed to the wheel carrier (2) and a second bearing shell (5) arranged coaxially to and rotatably relative to the first bearing shell (4), - an electric machine (7) which has a rotor (8) and a stator (9) rotationally fixed to the wheel carrier (2), - a rotor support (10) which is designed to support the rotor (8), - a brake device (28) which has a friction region (30), - a wheel disc (12) which is rotationally fixed to the second bearing shell (5), - a rim (13), and - a securing ring (14) which is rotationally fixed to the wheel disc (12) and which is designed to rotationally fixedly but releasably connect the rim (13) to the wheel disc (12). The securing ring (14) is arranged, in the axial direction, on the side of the axial stator center (ASM) facing away from the wheel carrier (2).

Description

[0001] Wheel hub drive device for a motor vehicle

[0002] The invention relates to a wheel hub drive device for a motor vehicle according to the features of the preamble of claim 1.

[0003] The prior art, as described in WO 2022 / 096504 A1, describes a wheel system for a vehicle, a vehicle, and a wheel rim. The wheel system comprises a stator, a rotor, a rotary bearing, and an in-wheel motor. The in-wheel motor comprises a motor stator and a motor rotor. The rotor is coupled to the stator via the rotary bearing for rotation about an axis of rotation. The motor stator is connected to the stator. The motor rotor is connected to the rotor for interaction with the motor stator to generate an electromagnetic force for rotating the rotor relative to the stator about the axis of rotation. The motor stator has a center defining a center plane extending through the center and perpendicular to the axis of rotation. The center plane has an inner side and an outer side. In operational use, the inner side points toward the center of the vehicle, and the outer side points away from the center of the vehicle.The rotor has a mounting surface configured for connection to the wheel rim. The mounting surface is located on the inside. The rotor couples the mounting surface to the stator only via the inside.

[0004] DE 103 38659 A1, JP 2008 - 24 148 A, WO 2005 / 000621 A1, and CN 1 05 966228 A each show wheel hub drive devices in which a fastening ring is connected in a rotationally fixed manner to a wheel disc, with a rim being connected in a rotationally fixed and detachable manner to the wheel disc via the fastening ring. DE 102013 202 809 A1 shows a wheel hub drive device in which a disc brake is arranged axially between an electric motor and a wheel disc of a wheel.

[0005] The invention is based on the object of providing a wheel hub drive device for a motor vehicle that is improved compared to the prior art. This object is achieved according to the invention by a wheel hub drive device for a motor vehicle having the features of claim 1.

[0006] Advantageous embodiments of the invention are the subject of the subclaims.

[0007] A wheel hub drive device for a motor vehicle has a wheel carrier and a wheel bearing, which has a first bearing shell connected to the wheel carrier in a rotationally fixed manner and a second bearing shell arranged coaxially and rotatably with the first bearing shell. Furthermore, the wheel hub drive device has an electric machine having a rotor and a stator connected to the wheel carrier in a rotationally fixed manner. In addition, the wheel hub drive device has a rotor carrier designed to support the rotor. The rotor carrier is, in particular, connected to the rotor in a rotationally fixed manner. The wheel hub drive device further has a braking device having a friction region. In addition, the wheel hub drive device has a wheel disc connected to the second bearing shell in a rotationally fixed manner.Furthermore, the wheel hub drive device has a rim and a fastening ring which is connected in a rotationally fixed manner to the wheel disc and is designed to connect the rim in a rotationally fixed but detachable manner to the wheel disc.

[0008] In a manner known per se, the fastening ring is arranged axially on a side of an axial stator center facing away from the wheel carrier. The connection point between the rim and the wheel disc formed by the fastening ring is thus arranged axially outward, in particular, relative to a vehicle's transverse axis.

[0009] According to the invention, the friction area is arranged axially between the stator and the wheel disc.

[0010] Furthermore, according to the invention, the second bearing shell is arranged radially inside the first bearing shell. The first bearing shell is thus in particular a radially outer bearing ring of the wheel bearing, which is fixed to the wheel carrier, and the second bearing shell is in particular a radially inner bearing ring of the wheel bearing. It is provided in particular that the rim is or can be connected to the second bearing shell, in particular in the manner described above via the attachment to the wheel disc and via this to the second bearing shell. Furthermore, according to the invention, the electric machine is designed as an axial flux machine and as an internal rotor, wherein a retaining ring of the stator carrier is designed to receive at least one stator carrier fastening screw of a stator carrier fastening screw connection, by means of which the stator carrier is fastened to the wheel carrier.In particular, it is provided that the retaining ring is arranged axially between the wheel carrier and the first bearing shell.

[0011] In one embodiment, the mounting ring is arranged radially outside a central radius of the stator.

[0012] In one embodiment, the fastening ring is arranged radially outside the friction area.

[0013] In one embodiment, the wheel carrier, an axial stator center, the friction region, and the wheel disc are arranged one after the other in the stated order with respect to an axial direction. The friction region is arranged, in particular, axially on a side of the stator facing away from the wheel carrier.

[0014] In one embodiment, the wheel hub drive device comprises a stator carrier which has a first plate element arranged axially between the wheel carrier and the stator, a cylinder element arranged radially outside the stator and a second plate element arranged axially between the stator and the wheel disc.

[0015] In one embodiment, the wheel hub drive device has a sealing system for the electric machine, which has precisely two sealing points, namely a first sealing point and a second sealing point. It is particularly provided that the first sealing point is integrated into the wheel bearing. It is particularly provided that the second sealing point is arranged radially within the second plate element and is designed to directly or indirectly seal the second plate element from the second bearing shell.

[0016] In one embodiment, the braking device comprises at least one brake shoe, wherein a brake shoe carrier is connected in a rotationally fixed manner to the second plate element and extends, in particular, axially from the second plate element toward the wheel disc. In one embodiment, the second sealing point is arranged radially within the brake shoe and axially overlapping the brake shoe.

[0017] In one embodiment, the wheel hub drive device has a rotor bearing formed separately from the wheel bearing, which has a third bearing shell arranged rotatably relative to the wheel carrier. In particular, the third bearing shell is arranged radially outside the first bearing shell and axially at least partially overlapping the first bearing shell. The third bearing shell is, in particular, connected to the rotor carrier in a rotationally fixed manner. In particular, a coupling is provided, which is arranged axially between the rotor and the wheel disc and which is designed to rotationally fixedly couple the rotor to the wheel disc and to decouple it from the latter.This coupling is arranged in particular between the third bearing shell, which is connected in a rotationally fixed manner to the rotor carrier and thus in a rotationally fixed manner to the rotor, and the second bearing shell, which is connected in a rotationally fixed manner to the wheel disc, and is designed to couple the third bearing shell and thus, via the rotor carrier, the rotor in a rotationally fixed manner to the second bearing shell and thus to the wheel disc, and to decouple it from the latter.

[0018] In one embodiment, the fastening ring has fastening ring bores for receiving rim fastening screws, by means of which the rim can be connected or is connected to the fastening ring in a rotationally fixed manner. In particular, it is provided that the rim fastening screws are received in the fastening ring bores, thus connecting the rim to the fastening ring in a rotationally fixed manner.

[0019] In one embodiment, the braking device is designed as a drum brake. In particular, it is provided that a brake drum is connected to the wheel disc, in particular is fastened to the wheel disc, in particular is screwed to the wheel disc by means of a brake drum fastening screw connection.

[0020] In one embodiment, a cylindrical section of the rotor carrier is arranged radially inside the stator. The cylindrical section is arranged, in particular, axially overlapping the stator.

[0021] In the described solution, a wheel of the motor vehicle, comprising the wheel disc and the rim, is designed as a split wheel. The rim and wheel disc are designed separately and are connected or connected to each other in a rotationally fixed but detachable manner. In this connected state, they can also be separated again, i.e., detached from each other. To change a wheel or tire, only the rim is removed, i.e., from the wheel disc and thus from the motor vehicle. The wheel disc of the wheel remains on the motor vehicle. This makes it possible to change the tire without having to dismantle the entire electrical machine.

[0022] The described solution is particularly advantageous with regard to an axial installation space dimension, ie the described solution enables a particularly small design in the axial direction.

[0023] By arranging the brake drum on the wheel disc, an additional housing is no longer required, thus reducing the weight and the required installation space.

[0024] In the solution described, it is provided in particular that the stator carrier is clamped between the wheel carrier and the wheel bearing, i.e. in particular that the retaining ring of the stator carrier is arranged axially between the wheel carrier and the first bearing shell in the manner described above. The brake shoe or the plurality of brake shoes of the drum brake is / are advantageously attached directly to the stator carrier, in particular to a brake shoe carrier that is connected to the stator carrier in a rotationally fixed manner or in particular formed integrally therewith, in particular in the axial direction on the side of the rim, in particular axially between the wheel disc and stator. As described above, a coupling is also advantageously provided, which is arranged axially between the rotor and the wheel disc and which is designed to couple the rotor to the wheel disc in a rotationally fixed manner and to decouple it from the latter.This provides a possibility for mechanical coupling and decoupling between the rotor, in particular a rotor connection, and the wheel disc.

[0025] In the context of the present application, the term “inner rotor” is used as follows: The stator is connected to the wheel carrier on its radially outer side. In other words, a stator carrier, which is arranged axially overlapping the stator, is arranged radially outside the rotor. At least one rotor carrier section, in particular a cylindrical section of the rotor carrier arranged axially overlapping the stator, is arranged radially inside the stator. In the case of an outer rotor, an outer-running cylindrical section of the rotor carrier arranged axially overlapping the stator would be arranged radially outside the stator. In the context of the present application, the term “wheel” is understood in particular to mean a unit consisting of a wheel disc and rim. The rim is rotationally fixed to the wheel disc, but can be detachably, connected or connected. In the connected state, the “wheel” unit is formed.By removing the rim, this "wheel" unit can be disassembled, leaving the wheel disc in place. For example, the rim can be removed from the vehicle to change a tire and remounted after the tire change.

[0026] In the context of this application, the term "main axis of rotation" is used as follows: the axis of rotation of the rotor and, at the same time, the axis of rotation of the rim. The terms "axial" and "radial" refer to this axis.

[0027] In the context of this application, the term "rotationally fixed" is used as follows: Two elements are rotationally fixed if they are arranged coaxially to each other (relative to their rotational axis or to a rotational symmetry axis) and if they are connected in such a way that they always rotate at the same angular velocity. An element is rotationally fixed to a housing if it cannot be rotated relative to the housing.

[0028] In the context of the present application, the term "radially overlapping" is used as follows: Two (in particular substantially rotationally symmetrical) elements are arranged radially overlapping with respect to a common axis if they are at least partially arranged in a region of the same radial coordinates (and in particular the same angular coordinates).

[0029] In the context of the present application, the term "axially overlapping" is used as follows: Two elements are arranged axially overlapping with respect to a common axis if they are at least partially arranged in a region of the same axial coordinates.

[0030] In the context of the present application, “radially within...” means in particular that something is arranged in a region of smaller radii, relative to the wheel rotation axis, ie in particular the main rotation axis.

[0031] In the context of the present application, "axially within..." means, in particular, that it is arranged axially on the side toward the center of the vehicle, with respect to the assumed installed state in the motor vehicle. The center of the vehicle in the context of this application is, in particular, a center point of the vehicle on a transverse axis of the vehicle, i.e., the center of the vehicle in the transverse direction of the vehicle.

[0032] Embodiments of the invention are explained in more detail below with reference to a drawing.

[0033] It shows:

[0034] Fig. 1 shows a schematic sectional view of a wheel hub drive device for a motor vehicle.

[0035] Figure 1 shows a sectional view of an exemplary embodiment of a wheel hub drive device 1 for a motor vehicle. For reasons of clarity, the wheel hub drive device 1 is shown only up to a main axis of rotation A, i.e., only one, in particular upper, half of the wheel hub drive device 1 is shown.

[0036] The wheel hub drive device 1 comprises a wheel carrier 2 and a wheel bearing 3, which has a first bearing shell 4 connected to the wheel carrier 2 in a rotationally fixed manner and a second bearing shell 5 arranged coaxially and rotatably with the first bearing shell 4. In the illustrated embodiment, the second bearing shell 5 is arranged radially inside the first bearing shell 4. Wheel bearing rolling elements 6 are arranged between the first and second bearing shells 4, 5 as a further component of the wheel bearing 3. In the illustrated example, these rolling elements are designed as balls and can alternatively also be designed as rollers, for example.

[0037] Furthermore, the wheel hub drive device 1 has an electric machine 7, which has a rotor 8 and a stator 9 connected in a rotationally fixed manner to the wheel carrier 2. In the illustrated embodiment, the electric machine 7 is designed as an axial flux machine and as an internal rotor.

[0038] In addition, the wheel hub drive device 1 has a wheel disc 12, which is connected in a rotationally fixed manner to the second bearing shell 5, in the illustrated embodiment by means of at least one wheel disc screw connection 29. Furthermore, the wheel hub drive device 1 has a rim 13 and a fastening ring 14, which is connected in a rotationally fixed manner to the wheel disc 12 and is designed to connect the rim 13 in a rotationally fixed but detachable manner to the wheel disc 12. The fastening ring 14 is, for example, formed integrally with the wheel disc 12.

[0039] In the illustrated embodiment, the fastening ring 14 has fastening ring bores 15 for receiving rim fastening screws 16, by means of which the rim 13 can be or is connected to the fastening ring 14 in a rotationally fixed manner.

[0040] In the example shown, the rim 13 is connected to the wheel disc 12 in a rotationally fixed but detachable manner by means of this fastening ring 14 and the rim fastening screws 16. For this purpose, the rim fastening screws 16 are accommodated in the fastening ring bores 15. The rim 13 is thus connected to the wheel disc 12 in a rotationally fixed manner via the rim fastening screws 16 and the fastening ring 14, and via the latter to the second bearing shell 5.

[0041] In the embodiment illustrated by way of example and described here, a wheel of the motor vehicle, comprising the wheel disc 12 and the rim 13, is thus designed as a split wheel. The rim 13 and the wheel disc 12 are designed separately and are connectable or connected to one another in a rotationally fixed but detachable manner, and in this connected state can thus also be separated again, i.e., detached from one another. To change a wheel or tire, only the rim 13 is removed, i.e., from the wheel disc 12 and thus from the motor vehicle. The wheel disc 12 of the wheel remains on the motor vehicle. A tire change is thus possible without having to dismantle the entire electric machine 7.

[0042] The wheel hub drive device 1 further comprises a stator carrier 11, by means of which the stator 9, in the illustrated embodiment, is connected in a rotationally fixed manner to the wheel carrier 2. In the illustrated embodiment, the stator carrier 11 comprises a first plate element 17 arranged axially between the wheel carrier 2 and the stator 9, a cylinder element 18 arranged radially outside the stator 9, and a second plate element 19 arranged axially between the stator 9 and the wheel disc 12.

[0043] In the illustrated embodiment, lines 20 run into the stator 9, in the example shown through the stator carrier 11, in particular through its cylinder element 18. A retaining ring 21 of the stator carrier 11 is designed in the illustrated embodiment to receive at least one stator carrier fastening screw 22 of a stator carrier fastening screw connection, by means of which the stator carrier 11 is fastened to the wheel carrier 2. In the illustrated embodiment, the retaining ring 21 is arranged axially between the wheel carrier 2 and the first bearing shell 4 and is screwed to the wheel carrier 2 and the first bearing shell 4 in a rotationally fixed manner by means of one or more stator carrier fastening screws 22.

[0044] In addition, the wheel hub drive device 1 has a rotor carrier 10, which is designed to support the rotor 8. The rotor carrier 10 is connected to the rotor 8 in a rotationally fixed manner. In the illustrated embodiment, a cylindrical section 23 of the rotor carrier 10 is arranged radially within the stator 9 and, in the illustrated embodiment, is also arranged axially overlapping the stator 9.

[0045] In the illustrated embodiment, the wheel hub drive device 1 has a rotor bearing 24 which is designed separately from the wheel bearing 3 and has a third bearing shell 25 which is arranged rotatably relative to the wheel carrier 2 and is connected in a rotationally fixed manner to the rotor carrier 10. In the illustrated embodiment, this third bearing shell 25 is arranged radially outside the first bearing shell 4 and axially at least partially overlapping the first bearing shell 4. In the illustrated embodiment, the rotor bearing 24 is formed by the third bearing shell 25, the first bearing shell 4, and rotor bearing rolling elements 26 arranged therebetween, which are designed as balls in the illustrated example and can alternatively also be designed as rollers, for example.

[0046] In the illustrated embodiment, the wheel hub drive device 1 further comprises a clutch 27, which is arranged axially between the rotor 8 and the wheel disc 12 and which is designed to non-rotatably couple the rotor 8 to the wheel disc 12 and to decouple it from the latter. In the illustrated embodiment, this clutch 27 is arranged between the third bearing shell 25, which is non-rotatably connected to the rotor carrier 10 and thus non-rotatably connected to the rotor 8, and the second bearing shell 5, which is non-rotatably connected to the wheel disc 12, and is designed to non-rotatably couple the third bearing shell 25 and thus, via the rotor carrier 10, the rotor 8 to the second bearing shell 5 and thus to the wheel disc 12 and to decouple it from the latter.

[0047] The wheel hub drive device 1 has in the illustrated embodiment of the

[0048] Furthermore, a braking device 28 has a friction region 30. In the illustrated embodiment, the braking device 28 is designed as a drum brake. A brake drum 31 of this drum brake is connected to the wheel disc 12 in the illustrated embodiment, in particular, screwed to the wheel disc 12 by means of a brake drum fastening screw connection 32.

[0049] The braking device 28 further comprises at least one brake shoe 33, wherein a brake shoe carrier 34 is connected in a rotationally fixed manner to the second plate element 19 of the stator carrier 11. For example, it is formed integrally with the second plate element 19. In the illustrated embodiment, this brake shoe carrier 34 extends axially from the second plate element 19 toward the wheel disc 12.

[0050] In the illustrated embodiment, the wheel hub drive device 1 further comprises a sealing system for the electric machine 7, which has precisely two sealing points 35, 36, namely a first sealing point 35 and a second sealing point 36. In the illustrated embodiment, the first sealing point 35 is integrated into the wheel bearing 3. In the illustrated embodiment, the second sealing point 36 is arranged radially within the second plate element 19 and is designed to directly or indirectly seal the second plate element 19 from the second bearing shell 5.In the illustrated embodiment, the second sealing point 36 is arranged between a fastening section of the second bearing shell 5, by means of which the second bearing shell 5 is screwed to the wheel disc 12 via the wheel disc screw connection 29, and a connecting section 37 which, starting from the brake shoe carrier 34 connected to the second plate element 19 or formed integrally therewith, initially extends radially inwards and then angled axially outwards in the direction of the wheel disc 12. The second sealing point 36 is thus arranged radially inside the brake shoe 33 in the illustrated embodiment and axially overlaps the brake shoe 33.

[0051] In the illustrated embodiment, the fastening ring 14 is arranged axially on a side of an axial stator center ASM facing away from the wheel carrier 2. The connection point between the rim 13 and the wheel disc 12 formed by the fastening ring 14 is thus arranged, in particular, axially outward relative to a vehicle transverse axis.

[0052] In the illustrated embodiment, the fastening ring 14 is arranged radially outside a central radius of the stator 9. Furthermore, in the illustrated embodiment, it is arranged radially outside the friction region 30. In the illustrated embodiment, the friction region 30 is arranged axially between the stator 9 and the wheel disc 12.

[0053] In the illustrated embodiment, the wheel carrier 2, the axial stator center ASM, the friction region 30, and the wheel disc 12 are arranged one after the other in the stated order with respect to an axial direction. The friction region 30 is arranged, in particular, axially on a side of the stator 9 facing away from the wheel carrier 2.

[0054] List of reference symbols

[0055] 1 wheel hub drive device

[0056] 2 wheel carriers

[0057] 3 wheel bearings

[0058] 4 first bearing shell

[0059] 5 second bearing shell

[0060] 6 wheel bearing rolling elements

[0061] 7 electric machine

[0062] 8 Rotor

[0063] 9 Stator

[0064] 10 rotor arms

[0065] 11 Stator carrier

[0066] 12 wheel disc

[0067] 13 rim

[0068] 14 Mounting ring

[0069] 15 Mounting ring hole

[0070] 16 rim fastening screw

[0071] 17 first plate element

[0072] 18 cylinder element

[0073] 19 second plate element

[0074] 20 Line

[0075] 21 Retaining ring

[0076] 22 Stator carrier fastening screw

[0077] 23 Cylinder section

[0078] 24 rotor bearings

[0079] 25 third bearing shell

[0080] 26 rotor bearing rolling elements

[0081] 27 Clutch

[0082] 28 Braking device

[0083] 29 Wheel disc screw connection

[0084] 30 friction area

[0085] 31 brake drum

[0086] 32 Brake drum fastening screw connection

[0087] 33 Brake shoe 34 Brake shoe carrier

[0088] 35 first sealing point

[0089] 36 second sealing point

[0090] 37 connecting section

[0091] A main axis of rotation

[0092] ASM axial stator center

Claims

Patent claims 1. Wheel hub drive device (1) for a motor vehicle, comprising - a wheel carrier (2), - a wheel bearing (3) which has a first bearing shell (4) connected to the wheel carrier (2) in a rotationally fixed manner and a second bearing shell (5) arranged coaxially and rotatably with respect to the first bearing shell (4), - an electric machine (7) having a rotor (8) and a stator (9) connected to the wheel carrier (2) in a rotationally fixed manner, - a rotor carrier (10) which is designed to support the rotor (8), - a braking device (28) having a friction area (30), - a wheel disc (12) which is connected in a rotationally fixed manner to the second bearing shell (5), - a rim (13), and - a fastening ring (14) which is connected to the wheel disc (12) in a rotationally fixed manner and is designed to connect the rim (13) to the wheel disc (12) in a rotationally fixed but detachable manner, wherein the fastening ring (14) is arranged axially on a side of an axial stator center (ASM) facing away from the wheel carrier (2), characterized in that the friction region (30) is arranged axially between the stator (9) and the wheel disc (12), wherein the second bearing shell (5) is arranged radially inside the first bearing shell (4), wherein the electrical machine (7) is designed as an axial flux machine and as an internal rotor, wherein a retaining ring (21) of the stator carrier (11) is designed to receive at least one stator carrier fastening screw (22) of a stator carrier fastening screw connection, by means of which the stator carrier (11) is fastened to the wheel carrier (2), wherein the retaining ring (21) is axially between the wheel carrier (2) and the first Bearing shell (4) is arranged.

2. Wheel hub drive device (1) according to claim 1, characterized in that the fastening ring (14) is arranged radially outside a central radius of the stator (9).

3. Wheel hub drive device (1) according to one of the preceding claims, characterized in that the fastening ring (14) is arranged radially outside the friction region (30).

4. Wheel hub drive device (1) according to one of the preceding claims, characterized in that with respect to an axial direction, the wheel carrier (2), an axial stator center (ASM), the friction region (30) and the wheel disc (12) are arranged one after the other in the stated order.

5. Wheel hub drive device (1) according to one of the preceding claims, characterized by a stator carrier (11) which has a first plate element (17) arranged axially between the wheel carrier (2) and the stator (9), a cylinder element (18) arranged radially outside the stator (9) and a second plate element (19) arranged axially between the stator (9) and the wheel disc (12).

6. Wheel hub drive device (1) according to claim 5, characterized by a sealing system for the electric machine (7), which has exactly two sealing points (35, 36), namely a first sealing point (35) and a second sealing point (36), wherein the first sealing point (35) is integrated into the wheel bearing (3) and the second sealing point (36) is arranged radially inside the second plate element (19) and is designed to seal the second plate element (19) directly or indirectly with respect to the second bearing shell (5).

7. Wheel hub drive device (1) according to one of the preceding claims, characterized in that the braking device (28) has at least one brake shoe (33), wherein a brake shoe carrier (34) is connected in a rotationally fixed manner to the second plate element (19) and extends axially from the second plate element (19) extends in the direction of the wheel disc (12).

8. Wheel hub drive device (1) according to claim 7, characterized in that the second sealing point (36) is arranged radially inside the brake shoe (33) and axially overlapping the brake shoe (33).

9. Wheel hub drive device (1) according to one of the preceding claims, characterized by a rotor bearing (24) which is designed separately from the wheel bearing (3) and which has a third bearing shell (25) which is arranged rotatably relative to the wheel carrier (2), wherein the third bearing shell (25) is arranged radially outside the first bearing shell (4) and axially at least partially overlapping the first bearing shell (4), wherein a coupling (27) is included which is arranged axially between the rotor (8) and the wheel disc (12) and which is designed to couple the rotor (8) to the wheel disc (12) in a rotationally fixed manner and to decouple it from the latter.

10. Wheel hub drive device (1) according to one of the preceding claims, characterized in that the fastening ring (14) has fastening ring bores (15) for receiving rim fastening screws (16), by means of which the rim (13) is connected to the fastening ring (14) in a rotationally fixed manner.

11. Wheel hub drive device (1) according to one of the preceding claims, characterized in that the braking device (28) is designed as a drum brake, wherein a brake drum (31) is connected to the wheel disc (12).

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