Wheel hub drive device for a motor vehicle, and motor vehicle
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- MERCEDES BENZ GROUP AG
- Filing Date
- 2026-01-29
- Publication Date
- 2026-08-06
Smart Images
Figure EP2026052347_06082026_PF_FP_ABST
Abstract
Description
[0001] 2024P04030WQ
[0002] 1
[0003] Mercedes-Benz Group AG
[0004] Wheel hub drive device for a motor vehicle and motor vehicle
[0005] The invention relates to a wheel hub drive device for a motor vehicle according to the preamble of claim 1. Furthermore, the invention relates to a motor vehicle with at least one such wheel hub drive.
[0006] German patent DE 102022 116164 A1 discloses a known wheel hub drive for a motor vehicle, comprising a wheel carrier, a wheel hub rotatably mounted on the wheel carrier about a wheel axis of rotation relative to the wheel carrier, and a vehicle wheel that is rotationally fixed to the wheel hub and thus rotatable with the wheel hub about the wheel axis of rotation relative to the wheel carrier. A brake disc is also provided, which can be mechanically actuated by a brake element separately designed from the brake disc for braking the vehicle wheel.
[0007] DE 102008004081 A1 and DE 102006002421 A1 disclose wheel hub drives in which a disc brake is arranged radially within a stator of an electric machine designed as a radial flux machine, wherein the disc brake is also arranged axially overlapping with the stator of the electric machine.
[0008] The object of the present invention is to create a wheel hub drive device for a motor vehicle and a motor vehicle with at least one such wheel hub drive device, so that an advantageous braking system can be implemented in a particularly space-saving manner.
[0009] This task is accomplished by a wheel hub drive device with the features of claim 1 and by a motor vehicle with the features of 2024P04030WQ
[0010] 2
[0011] Claim 8 of the patent has been solved. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.
[0012] A first aspect of the invention relates to a wheel hub drive device, also referred to as a wheel hub drive or wheel hub drive assembly, for a motor vehicle, also simply referred to as a vehicle. This means that the motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, in its fully manufactured state has the wheel hub drive device and can be driven, for example, 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.
[0013] The wheel hub drive device comprises a wheel carrier and a wheel bearing, which includes a first bearing race and a second bearing race. The first bearing race is fixed to the wheel carrier, in particular permanently fixed to rotation. The second bearing race is arranged coaxially and rotatably with respect to the first bearing race. This means that the second bearing race is rotatable about an axis of rotation relative to the first bearing race and relative to the wheel carrier.
[0014] The wheel hub drive comprises, in particular, one of the vehicle wheels, whereby, where the vehicle wheel is mentioned below, unless otherwise appropriate, this refers to the vehicle wheel of the wheel hub drive device (wheel hub drive). The wheel hub drive device is also referred to as the first 2024P04030WQ
[0015] 3
[0016] The term "wheel hub drive" or "first wheel hub drive device" is used. When the wheel hub drive or wheel hub drive device is mentioned before and after, unless otherwise specified, it refers to the first wheel hub drive, that is, the first wheel hub drive device. The vehicle wheel of the wheel hub drive is also referred to as the first vehicle wheel. When the vehicle wheel is mentioned before and after, it refers to the first vehicle wheel of the wheel hub drive, unless otherwise specified. Thus, the first vehicle wheel can be driven by means of the first wheel hub drive, particularly electrically, and thereby rotated around the wheel's axis of rotation relative to the wheel carrier.For example, in its fully manufactured state, the motor vehicle 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, especially purely electrically, and it is conceivable that the second wheel hub drive includes, that is, encompasses, the second vehicle wheel. Preferably, the first and second vehicle wheels are the same axle. The preceding and following descriptions of 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.
[0017] The wheel hub drive device comprises an electric machine designed as an external radial flux machine. 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 relative to the stator and relative to the wheel carrier. The stator is, in particular permanently, non-rotatably connected to the wheel carrier.
[0018] For example, the machine's axis of rotation coincides with the aforementioned axis of rotation. In particular, the electric machine can drive torques via its rotor. By means of the respective drive torque, and thus by means of the electric machine, the second bearing shell can be driven and thereby rotated about the axis of rotation relative to the first bearing shell and relative to the wheel carrier. By driving the second bearing shell, the vehicle wheel can be driven by means of the second bearing shell and thereby rotated about the wheel's axis of rotation relative to the wheel carrier.
[0019] The vehicle wheel is permanently and rotationally fixed to the second bearing race. The vehicle wheel consists of a wheel disc and a rim. The rim is part number 2024P04030WQ.
[0020] 4
[0021] The rim and wheel disc are connected to the wheel disc, particularly permanently, by rotation. In principle, it would be conceivable that the rim and wheel disc are formed separately from each other and connected to each other, particularly permanently, by rotation, or that the wheel disc and rim are formed as a single unit, that is, made from a single piece and thereby connected to each other, particularly permanently, by rotation.
[0022] 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. In particular, when the vehicle wheel rolls on the ground, the tire rolls, in particular directly, on the ground. It is also conceivable that the wheel disc, and thus the vehicle wheel, is permanently and rotationally connected to the second bearing shell, so that the vehicle wheel is permanently and rotationally connected to the second bearing shell via the wheel disc.
[0023] The wheel hub drive device also features a disc brake, by means of which, by actuating the disc brake, in particular hydraulically, the second bearing shell can be braked with respect to rotations occurring about the axis of rotation relative to the first bearing shell and relative to the wheel carrier, i.e., it can be slowed down and thus at least decelerated. This allows the vehicle wheel to be braked with respect to rotations occurring about the wheel axis of rotation and relative to the wheel carrier, i.e., it can be slowed down and thus at least decelerated, thereby braking the vehicle as a whole. This means that by actuating the disc brake, in particular hydraulically, braking can be effected or carried out, whereby the second bearing shell, and thus the vehicle wheel, can be braked with respect to rotations occurring about the axis of rotation and relative to the wheel carrier, i.e., it can be slowed down and thus at least decelerated.
[0024] To implement the braking system in a particularly space-saving and therefore particularly advantageous manner, a friction area of the disc brake is arranged in a known manner, overlapping axially with the stator and radially within the stator. The friction area is understood to mean, in particular, the following: The disc brake has a first brake element, which is designed as a brake disc. The first brake element is, in particular, permanently and rotationally fixed to the second bearing shell and thus connected to the second bearing shell and the vehicle wheel around the axis of rotation relative to the wheel carrier and relative to the 2024P04030WQ
[0025] 5
[0026] The first bearing shell is rotatable. The disc brake also has a second brake element, which is, in particular, permanently and rotationally connected to the wheel carrier. The first brake element has at least one first friction surface, and the second brake element has at least one second friction surface. By actuating the disc brake, in particular hydraulically, the friction surfaces in the friction area can be brought into mutual, friction-fit, in particular direct, contact, so that the friction surfaces rub against each other, in particular directly, and thereby the second bearing shell and only the vehicle wheel can be braked, i.e., slowed down.The friction zone is therefore an area in which the friction surfaces can be brought into mutual, friction-fit and especially direct contact by, in particular hydraulic, actuation of the disc brake, so that friction can be generated in the friction zone between the friction surfaces for braking, i.e., braking of the second bearing shell and thus of the second vehicle wheel.
[0027] In the invention, the friction area and the disc brake are particularly advantageously nested and thus arranged in a particularly space-saving manner, so that the space requirement of the wheel hub drive device can be kept within a particularly small range.
[0028] Since the electric machine is designed as an external radial flux machine, i.e., as an external rotor, the stator, for example, is connected to the wheel carrier on its radially inner side, and the rotor, in particular a magnetic area of the rotor, in whose magnetic area also referred to as rotor magnets and in particular magnets designed as permanent magnets of the rotor are arranged, is arranged radially outside the stator, in particular radially outside of a winding area of the stator.
[0029] The winding area 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, whereby at least part of the winding is arranged in the winding area. A magnetic field can be generated by means of the winding, 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 fact that the magnets of the rotor, also referred to as rotor magnets, interact with the changing magnetic field. For example, the stator has a laminated core, also referred to as the stator core, to which the stator winding is attached, so that 2024P04030WQ
[0030] 6
[0031] The stator winding is supported by the stator's laminated core. Furthermore, it is conceivable that the rotor has a laminated core, also referred to as the rotor core, to which the rotor magnets are attached. The rotor magnets are at least partially located within the rotor's magnetic field.
[0032] It is conceivable that the electric machine has a stator support which is, for example, permanently and non-rotatably connected to the stator, so that the stator is supported by the stator support.
[0033] The stator and the stator support are designed separately from one another and are, in particular, permanently and rotationally fixed to each other. Within the scope of this invention, the term "stator" therefore does not include the stator support. When geometric specifications relating to the stator are made within the scope of this invention, these specifications refer in particular to the winding area of the stator.
[0034] Furthermore, the electric machine has a rotor carrier which is, in particular, permanently and non-rotatably connected to the rotor. It is also conceivable that the rotor and the rotor carrier are designed separately and, in particular, permanently and non-rotatably connected to each other. Most importantly, the stator, in particular in contrast to the stator carrier, 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 contrast to the rotor carrier, is a magnetically active element by means of which the magnetic flux of the magnetic field can be guided.
[0035] Preferably, the electric machine is a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and most preferably several hundred volts.
[0036] 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, such as 2024P04030WQ
[0037] 7
[0038] permanently, connected to the second bearing shell, so that the vehicle wheel, especially the wheel disc, is screwed to the second bearing shell.
[0039] The axis of rotation of the wheel hub drive device, whose axial direction coincides with the axis of rotation, was also referred to as the principal axis of rotation of 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 axis of rotation. Where the axial direction is mentioned before and below, this refers, unless otherwise specified, to the axial direction of the wheel hub drive device. Where the radial direction is mentioned before and below, this refers, unless otherwise specified, to the radial direction of the wheel hub drive device, whose circumferential direction extends around the axis of rotation and lies in an imaginary plane perpendicular to the wheel's axis of rotation and thus perpendicular to the axial direction.When the circumferential direction is mentioned before and below, unless otherwise specified, this refers to the circumferential direction of the wheel hub drive device.
[0040] Within the scope of this disclosure, the feature "radially overlapping" is to be understood as follows: Two elements, in particular at least substantially rotationally symmetrical, are arranged, in particular with respect to a common axis extending, for example, in the radial direction of the wheel hub drive and / or radially overlapping in the radial direction of the wheel hub drive, in particular 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 thereby, for example, extend outwards in the radial direction. The term "radial" refers to the radial direction of the wheel hub drive. In other words, the term "radial" means the radial direction of the wheel hub drive.
[0041] The term "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 of the wheel hub drive, and / or in the axial direction of the wheel hub drive, especially with respect to each other, if they are each at least partially located in an area of the same axial 2024P04030WQ
[0042] 8
[0043] The coordinates are arranged, with the axial coordinates running in the axial direction. Within the context 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.
[0044] Within the scope of the present disclosure, the feature that a first component is arranged radially inside a second component means 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 and increase radially outwards. Within the scope of the present disclosure, the feature that a first component is arranged radially outside a second component means that the first component is arranged in a region of larger radii than the second component, particularly with respect to the axis of rotation.
[0045] The term "stator" thus refers in particular and at least to the winding of the stator. The stator and the stator support, for example, form a stator assembly that includes the stator and the stator support. The term "rotor" thus refers in particular and at least to the rotor magnets of the rotor. For example, the rotor and the rotor support form a rotor assembly that includes the rotor and the rotor support.
[0046] Within the scope of the present disclosure, the feature that two rotatably mounted components are rotationally fixed to one another is understood to mean that the rotationally fixed components 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 axis of rotation, at the same angular velocity. An element that is essentially rotationally symmetrical is rotationally fixed to the wheel carrier if it cannot be rotated relative to, that is, opposite to, the wheel carrier.
[0047] 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. 2024P04030WQ
[0048] 9
[0049] which is switchable between a coupling state that connects or couples the components in a rotating 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 the components are always, or rather always, permanently connected or coupled to each other.
[0050] According to the invention, a rotor carrier cover of the rotor carrier is arranged axially on a side of the rotor facing away from the wheel disc, particularly axially. This allows for a particularly compact design of the wheel hub drive. Furthermore, according to the invention, a seal is arranged radially and / or axially between the rotor cover and the stator carrier, thereby providing a particularly advantageous seal in a particularly cost-effective manner. The seal is, for example, made of an elastomer, particularly rubber, which makes the seal elastically deformable, particularly with a rubber-like elasticity.
[0051] To minimize the installation space required for the wheel hub drive, a first embodiment of the invention provides that a first plate element of a brake disc holder of the disc brake is arranged axially between the wheel disc and the stator. For example, the brake disc holder supports and holds the brake disc, and thus the first brake element. It is conceivable that the brake disc is designed separately from the brake disc holder and is, in particular, permanently and rotationally fixed to the brake disc holder. The brake disc holder is, for example, permanently and rotationally fixed to the second bearing shell, so that, for example, the brake disc is, via the brake disc holder, permanently and rotationally fixed to the second bearing shell.
[0052] The first plate element, for example, extends at least essentially in a plane that is perpendicular to the axial direction.
[0053] Another embodiment is characterized in that a second disc element of the rotor carrier is arranged axially between the wheel disc and the first disc element. For example, the second disc element extends flatly in an imaginary second plane, which runs perpendicular to the axial direction. 2024P04030WQ
[0054] 10
[0055] The space required for the wheel hub drive device can be kept particularly low.
[0056] In order to implement the braking described above in a particularly space-saving and therefore particularly advantageous manner, a further embodiment of the invention provides that a third plate element of the stator carrier is arranged axially on a side of the stator facing away from the wheel disc. For example, the third plate element extends at least substantially over a surface in an imaginary third plane, which runs perpendicular to the axial direction.
[0057] To achieve a particularly space-saving braking system, a further embodiment of the invention provides that a brake caliper bracket of the disc brake is connected to the third disc element, particularly permanently and in a rotationally fixed manner, on a surface of the third disc element that is axially facing the wheel disc. The second brake element is or comprises the brake caliper bracket. Furthermore, it is conceivable that the second brake element and the brake caliper bracket are components of a braking device that is, for example, particularly permanently and in a rotationally fixed manner, connected to the wheel carrier. It is conceivable that, by actuating the disc brake, particularly hydraulically, the second brake element can be displaced axially relative to the brake caliper bracket, thereby bringing the friction surfaces into, in particular direct, mutual frictional contact.Thus, for example, the second brake element is held at least indirectly and axially displaceable on the brake caliper bracket.
[0058] It has proven particularly advantageous when the brake caliper bracket is arranged radially outside the brake disc of the disc brake, which allows the disc brake to be integrated into the wheel hub drive in a particularly space-saving manner.
[0059] Finally, to achieve a particularly compact design of the wheel hub drive, it has proven especially advantageous if the seal, which is arranged axially and / or radially between the rotor carrier cover and the stator carrier, is also arranged axially overlapping with the third plate element.
[0060] A second aspect of the invention relates to a motor vehicle, also simply referred to as a vehicle and preferably designed as a motor vehicle, in particular a passenger car, which has at least one wheel hub drive device according to the first 2024P04030WQ
[0061] 11
[0062] The invention exhibits two aspects. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.
[0063] Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment, as well as from the drawing.
[0064] The drawing shows in the single Fig. 1 a partial schematic longitudinal sectional view of a wheel hub drive device of a motor vehicle.
[0065] In the figures, identical or functionally equivalent elements are provided with the same reference symbols.
[0066] Figure 1 shows a partial schematic longitudinal sectional view of a wheel hub drive device 10, also referred to as a wheel hub drive, 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 rotatably mounted on the wheel carrier 12 about a pivot axis 16, also referred to as the main axis of rotation, and thus held in place. For this purpose, the wheel hub drive 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, particularly 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, in this case 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. The wheel bearing 18 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. A third raceway and a fourth raceway are provided on the bearing shell 22, for example such that the third raceway and the fourth raceway are permanently and rotationally fixed to the bearing shell 20.
[0067] 12
[0068] are connected to the bearing shell 22. For example, the third raceway and the fourth raceway are formed as a single unit with the bearing shell 22.
[0069] 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 axial direction of which coincides with 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 (wheel hub drive device 10) and 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. The rolling elements 26 form a second rolling element ring in which the rolling elements 26 are arranged successively in the circumferential direction of the wheel hub drive. The rolling element rings are arranged successively in the axial direction of the wheel hub drive 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 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.
[0070] The wheel hub drive comprises 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. The stator 32 is or comprises at least one winding, also referred to as a stator winding, with 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 allowing it to rotate about the axis of rotation 16 relative to the stator 32 and relative to the wheel carrier 12. The stator 32 is, in particular permanently, connected to the wheel carrier 12 in a rotationally fixed manner.For this purpose, a stator support 36 is provided, which is designed separately from the stator 32 and is, in particular, permanently and rotationally fixed to the wheel carrier 12. The stator support 36 is, in particular, permanently, 2024P04030WQ.
[0071] 13
[0072] The stator support 36 and the wheel carrier 12 are connected to the wheel carrier 12 in a rotationally fixed manner. In principle, it would be conceivable for the stator support 36 and the wheel carrier 12 to be formed as a single unit, i.e., from a single piece. 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, particularly permanently. The electric machine 30 also has a rotor support 38, which is formed separately from the rotor 34 and is connected to the rotor 34 in a rotationally fixed manner, particularly permanently. It can be seen that the stator 32 is connected to the wheel carrier 12 in a rotationally fixed manner, particularly permanently, via the stator support 36. The rotor 34 is connected to the second bearing shell 22 in a rotationally fixed manner, particularly permanently. In the present case, the rotor 34 is connected to the bearing shell 22 separately, in particular permanently, via the rotor support 38.In the present case, the rotor carrier 38 is designed separately from the bearing shell 22 and is, in particular, permanently and rotationally fixed to the bearing shell 22, for example by means of the rotor carrier 38 being screwed to the bearing shell 22.
[0073] 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 bearing shell 22 in a rotationally fixed manner, particularly permanently, for example, by means of the wheel disc 40, and thus the vehicle wheel 14, being screwed to the bearing shell 22 via the wheel disc 40.
[0074] The wheel hub drive also includes a disc brake 44. The disc brake 44 has a brake disc 46 as its first braking element. Furthermore, the disc brake 44 has at least one second braking element, which is not shown in detail in Fig. 1. The disc brake has a caliper bracket 48, wherein, for example, the second braking element is axially displaceable on the caliper bracket 48, i.e., in the axial direction of the wheel hub drive 10 relative to the caliper bracket 48. The axial direction of the wheel hub drive coincides with the axis of rotation 16 and is illustrated by a double arrow 50. The radial direction of the wheel hub drive is perpendicular to the axial direction and thus perpendicular to the axis of rotation 16 and is illustrated by a double arrow 52.
[0075] The brake disc 46, for example, has at least one first friction surface. The second brake element has at least one second friction surface. By, in particular 2024P04030WQ
[0076] 14
[0077] When the disc brake 44 is hydraulically actuated, the second brake element is axially displaceable, i.e., in the axial direction of the wheel hub drive relative to the brake caliper bracket 48 and also relative to the brake disc 46, such that the second brake element can be moved onto the brake disc 46 and thus the second friction surface onto the first friction surface. This allows the friction surfaces in a friction zone RB of the disc brake 44 to be brought into direct, mutual, frictional contact, thereby generating friction between the friction surfaces in the friction zone RB. This friction allows the brake disc 46, and thus the bearing shell 22 and the vehicle wheel 14, to be slowed down during rotation about the axis of rotation 16 relative to the wheel carrier 12, relative to the second brake element, and relative to the brake caliper bracket 48. In this way, the vehicle as a whole can be braked, i.e., slowed down.The brake disc 46 is permanently and rotationally fixed to the bearing shell 22 and thus to the vehicle wheel 14. The brake caliper bracket 48 and the second brake element are permanently and rotationally fixed to the wheel carrier 12 and are therefore not rotatable about the axis of rotation 16 relative to the wheel carrier 12.
[0078] In order to brake the bearing shell 22 and thus the vehicle wheel 14 in a particularly favorable manner, it is provided that the friction area RB of the disc brake 44 is arranged axially overlapping with the stator 32 and radially inside the stator 32.
[0079] The wheel hub drive, in particular the disc brake 44, has a brake disc holder 54. In the embodiment shown in Fig. 1, the brake disc holder 54 is designed separately from the brake disc 46 and is, in particular, permanently and rotationally fixed to the brake disc 46. In the present case, the brake disc holder 54 is, in particular, permanently and rotationally fixed to the bearing shell 22. For example, the brake disc holder 54 is designed separately from the bearing shell 22 and is, in particular, permanently and rotationally fixed to the bearing shell 22. For example, the brake disc holder 54 is, in particular, permanently and rotationally fixed to the bearing shell 22 such that the brake disc holder 54 is screwed to the bearing shell 22. It can be seen that the brake disc 46 is connected to the bearing shell 22 by means of the brake disc holder 54, in particular permanently. The brake disc 46 is thus supported by the brake disc holder 54.2024P04030WQ.
[0080] 15
[0081] The brake disc holder 54 has a first plate element 56, which is arranged axially between the wheel disc 40 and the stator 32.
[0082] The rotor carrier 38 has a second plate element 58, which is arranged axially between the wheel disc 40 and the first plate element 56. The rotor carrier 38 and the brake disc holder 54, and thus the plate elements 56 and 58, are designed separately from one another and are, in particular, permanently and rotationally fixed to one another, especially by the fact that the plate elements 56 and 58 are screwed together.
[0083] The stator carrier 36 has a third disc element 60, which is arranged axially, i.e. in the axial direction of the wheel hub drive, on a side S1 of the stator 32 which is directed away from the wheel disc 40 in particular axially.
[0084] The brake caliper bracket 48 is permanently and rotationally fixedly connected to the third disc element 60, particularly in the axial direction, at a surface F1 of the third disc element 60 facing the wheel disc 40. Furthermore, the brake caliper bracket 48 is arranged radially outside the brake disc 46. The brake caliper bracket 48 is arranged radially inside the stator 32 and axially overlapping the stator 32. The stator carrier 36 comprises the disc element 60 and a cylindrical section 62, which is cylindrical at least in a partial area on both its outer and inner circumferences, and thus in the form of a right circular cylinder. The central axis of this right circular cylinder, also referred to as its axis, coincides with the axis of rotation 16 and is rotationally symmetrical with respect to the axis of rotation 16. The cylindrical section 62 projects axially from surface F1 towards the wheel disc 40.Since the cylinder section 62 is cylindrical on its outer circumference, it has a cylindrical, and thus cylindrically shaped, mandrel-shaped surface M1 on its outer circumference, projecting outwards in the radial direction of the wheel hub drive, to which the stator 32 is connected, in particular permanently and in a rotationally fixed manner. It can be seen that the brake caliper bracket 48 is arranged radially inside and axially overlapping the cylinder section 62, which is arranged radially inside and axially overlapping the stator 32. Furthermore, the cylinder section 62 is arranged axially overlapping and radially inside the rotor 34. The brake disc 46 is arranged radially inside and axially overlapping the cylinder section 62. 2024P04030WQ.
[0085] 16
[0086] The rotor carrier 38 has a fourth disc element 64, which is arranged axially between the disc element 56 and the wheel disc 40. Furthermore, the rotor carrier 38 has a second cylindrical section 66, which is cylindrical at least in a partial area on both its outer and inner circumferences and thus designed as a second straight circular cylinder, whose second cylinder axis, also referred to as the second central axis, coincides with the first cylinder axis and with the axis of rotation 16. The cylindrical section 66 projects axially from the disc element 64 towards the wheel carrier 12 in the direction of the wheel hub drive. Since the cylindrical section 66 is cylindrical on its inner circumference, it has a cylindrical, inner circumferential surface M2 to which the rotor 34 is permanently and rotationally fixed. The rotor 34 is thus arranged radially inside and axially overlapping the cylindrical section 66.It is also evident that the stator 32, the cylinder section 62, the brake caliper holder 48 or 46 are arranged radially inside and axially overlapping with the cylinder section 66.
[0087] For example, the plate element 64 and the cylinder section 66 are formed in one piece, that is, from a single piece.
[0088] The rotor carrier 38 has a rotor cover 68, which is, for example, formed separately from the cylinder section 66 and is, in particular, permanently and rotationally fixed to the cylinder section 66, especially by being screwed to the cylinder section 66. In this case, the rotor cover 68 rests against an axial end face of the cylinder section 66, which, viewed axially and towards the wheel carrier 12, terminates at its axial end face. The axial end face of the cylinder section 66 runs, for example, in an imaginary plane that is perpendicular to the axis of rotation 16. It can be seen that the rotor 34 and the stator 32 are each arranged at least partially radially overlapping the rotor cover 68.
[0089] The rotor cover 68 is arranged axially, that is in the axial direction of the wheel hub drive, on a side SE2 of the rotor 34 facing away from the wheel disc 40.
[0090] The wheel hub drive further comprises a seal 70, which is made, for example, of an elastomer, in particular a rubber. The seal 70 is located axially and / or radially between the rotor cover 68 and the stator carrier 36, in particular 2024P04030WQ
[0091] 17
[0092] the disc element 60 and / or the cylinder section 62, wherein, for example, the rotor cover 68 is sealed against the stator carrier 36, in particular against the cylinder section 62 and / or against the disc element 60, by means of the seal 70. In this case, the seal 70 is arranged axially overlapping the disc element 60.
[0093] For example, the seal 70 can rotate with the rotor cover 38 and thus with the rotor 34 about the axis of rotation 16 relative to the stator 32 and relative to the stator support 36, whereby during such rotation of the rotor support 38 about the axis of rotation 16 relative to the stator support 36, the seal 70 slides off the stator support 36, in particular directly, especially on the disc element 60. Reference numeral list
[0094] 10 Wheel hub drive device 12 Wheel carrier
[0095] 14 vehicle wheel
[0096] 16 axis of rotation
[0097] 18 wheel bearings
[0098] 20 first bearing shell
[0099] 22 second bearing cup
[0100] 24 first rolling element
[0101] 26 second rolling element
[0102] 28 Double Arrow
[0103] 30 electric machine
[0104] 32 Stator
[0105] 34 Rotor
[0106] 36 stator carriers
[0107] 38 rotor carriers
[0108] 40 wheel disc
[0109] 42 rim
[0110] 44 disc brake
[0111] 46 brake disc
[0112] 48 brake caliper brackets
[0113] 50 Double Arrow
[0114] 52 Double Arrow
[0115] 54 Brake disc bracket
[0116] 56 first plate element
[0117] 58 second plate element
[0118] 60 third plate element
[0119] 62 Cylinder section
[0120] 64 fourth plate element
[0121] 66 Cylinder section
[0122] 68 Rotor covers
[0123] 70 Seal
[0124] F1 surface
[0125] M1 outer circumferential surface; M2 inner circumferential surface; RB friction area
[0126] S1 page
[0127] SE2 page
Claims
2024P04030WQ 20 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) non-rotatably connected to the wheel carrier (12) and a second bearing shell (22) arranged coaxially and rotatably to the first bearing shell (20), an electric machine (30) designed as an external radial flux machine which has a rotor (34) and a stator (32) non-rotatably connected to the wheel carrier (12), a vehicle wheel (14) which is non-rotatably connected to the second bearing shell (22) and has a wheel disc (40) and a rim (42), and a disc brake (44), wherein a friction area (RB) of the disc brake (44) is arranged axially overlapping with the stator (32) and radially inside the stator (32), characterized by the fact that a rotor carrier cover (68) is arranged axially on one side (SE2) of the rotor (34) facing away from the wheel disc (40), wherein a seal (70) is arranged axially and / or radially between the rotor carrier cover (68) and a stator carrier (36).
2. Wheel hub drive device (10) according to claim 1, characterized by the fact that a first plate element (56) of a brake disc holder (54) of the disc brake (44) is arranged axially between the wheel disc (40) and the stator (32).
3. Wheel hub drive device (10) according to claim 2, characterized by the fact that 2024P04030WQ 21 a second plate element (58) of a rotor carrier (38) is arranged axially between the wheel disc (40) and the first plate element (56).
4. Wheel hub drive device (10) according to one of the preceding claims, characterized in that a third plate element (60) of a stator carrier (36) is arranged axially on a side (S1) of the stator (32) facing away from the wheel disc (40).
5. Wheel hub drive device (10) according to claim 4, characterized by the fact that a brake caliper holder (48) of the disc brake (44) is connected to the third plate element (60) in a rotationally fixed manner to a surface (F1) of the third plate element (60) facing the wheel disc (40).
6. Wheel hub drive device (10) according to claim 5, characterized by the fact that the brake caliper holder (48) is arranged radially outside a brake disc (46) of the disc brake (44).
7. Wheel hub drive device (10) according to one of claims 4 to 6, characterized in that the seal (70) is arranged axially overlapping with the third plate element (60).
8. Motor vehicle, comprising at least one wheel hub drive device (10) according to one of the preceding claims.