Axial flux machine and hub drive for a motor vehicle

Abstract

The present invention relates to an axial flux engine (2) comprising: a stator (3), a rotor (4) coaxial with and rotatably arranged relative to the stator (3), a rotor bracket (5), and a stop device (16) having a first stop surface (F1) on the rotor side and a second stop surface (F2) on the stator side, wherein the two stop surfaces (F1, F2) are arranged perpendicular to the rotation axis (A) of the rotor (4). The rotor bracket (5) has a cylindrical portion (5.1) which is axially overlapped relative to the stator (3) and is configured to axially rigidly connect a first rotor half (4.1) to a second rotor half (4.2). The present invention also relates to a hub drive device (1) for a motor vehicle.

Description

Technical Field

[0001] The present invention relates to an axial flux engine with the features of the preamble of claim 1 and a hub drive device for a motor vehicle. Background Technology

[0002] As described in DE 10 2022 111 878 A1, an electric axial flux mechanism is known from the prior art. The axial flux mechanism includes a stator and a rotor rotatable relative to the stator, having a first disc-shaped rotor body arranged anti-torsionally on a rotor shaft and a second disc-shaped rotor body axially spaced from and arranged anti-torsionally on the rotor shaft. The stator is axially disposed between the first rotor body and the second rotor body. A mechanical air gap adjustment device is provided in the torque flow between the first rotor body and the rotor shaft and between the second rotor body and the rotor shaft for axially moving the first rotor body and / or the second rotor body to establish at least one air gap between one of the rotor bodies and the stator. Summary of the Invention

[0003] The purpose of this invention is to provide an improved axial flux engine compared to the prior art and an improved hub drive device for motor vehicles compared to the prior art.

[0004] According to the present invention, this objective is achieved by an axial flux engine having the features of claim 1 and a hub drive device for a motor vehicle having the features of claim 9.

[0005] Advantageous designs of the present invention are the subject of the dependent claims.

[0006] An electric axial flux motor includes a stator, a rotor coaxial with and rotatably arranged relative to the stator, a rotor carrier, and a stop device. The rotor has a first rotor half and a second rotor half, wherein the two rotor halves are advantageously axially spaced apart. The stop device has a first stop surface on the rotor side and a second stop surface on the stator side, wherein these two stop surfaces are arranged perpendicular to the rotor's axis of rotation. In this case, the stop device is arranged radially inward of the stator.

[0007] In this configuration, the rotor bracket has a cylindrical portion that overlaps axially with respect to the stator and is configured to rigidly connect the first rotor half to the second rotor half in an axial manner. The cylindrical portion prevents the two rotor halves from approaching each other axially, at least in the radial region of the cylindrical portion, thus also counteracting the axial approach between the rotor halves and the stator.

[0008] According to the present invention, the cylindrical portion is arranged on the radial exterior of the stator.

[0009] Specifically, the first stop surface on the rotor side faces the second stop surface on the stator side axially, and the second stop surface on the stator side faces the first stop surface on the stator side axially. In particular, the two stop surfaces are arranged to overlap radially.

[0010] The first and second stop surfaces advantageously form a sliding bearing, particularly temporarily. For example, the two stop surfaces can also slide permanently against each other, i.e., the sliding bearing is permanently effective, or, particularly advantageously, the sliding bearing is constructed with an air gap. During normal operation of the axial flux machine, the two stop surfaces are spaced apart, creating an air gap between them. Therefore, the sliding bearing is not engaged. Then, the two stop surfaces advantageously impact each other only temporarily, particularly only under the specific influence acting on the axial flux machine and causing the rotor and stator to approach each other, and slide against each other. Thus, the sliding bearing correspondingly only comes into contact temporarily.

[0011] In one embodiment, the stator is axially arranged between the first rotor half and the second rotor half.

[0012] In one embodiment, the first stop surface is associated with the first rotor half.

[0013] The stop device is advantageously arranged radially inside the cylindrical portion, which is arranged radially outside the stator.

[0014] The stop device is advantageously arranged to overlap axially with the cylindrical portion.

[0015] In the context of this invention, the term "stator" specifically refers to the range of stator windings.

[0016] A stator bracket is a device configured to hold the stator on a wheel bracket of a motor vehicle. Specifically, a stator bracket is a component by which the stator (i.e., the area of ​​the stator windings) can be connected to the wheel bracket.

[0017] In one embodiment, the stopping device has a third stopping surface on the rotor side and a fourth stopping surface on the stator side, wherein the two stopping surfaces are arranged perpendicular to the rotation axis of the rotor.

[0018] Specifically, the third stop surface on the rotor side faces the fourth stop surface on the stator side axially, and the fourth stop surface on the stator side faces the third stop surface on the stator side axially. Specifically, the two stop surfaces are arranged to overlap radially.

[0019] In one embodiment, all four stop surfaces are arranged to overlap radially.

[0020] In one embodiment, the third and fourth stop surfaces form a sliding bearing, particularly temporarily. For example, the two stop surfaces may slide permanently against each other, i.e., the sliding bearing is permanently engaged, or, particularly advantageously, the sliding bearing is constructed with an air gap. During normal operation of the axial flux machine, the two stop surfaces are spaced apart, creating an air gap between them. Therefore, the sliding bearing disengages. Then, the two stop surfaces advantageously impact each other only temporarily, particularly only under the specific influence acting on the axial flux machine and causing the rotor and stator to approach each other, and slide against each other. Thus, the sliding bearing engages accordingly only temporarily.

[0021] In one embodiment, the third stop surface is associated with the second rotor half.

[0022] In one embodiment, the first stop surface and the second stop surface are axially disposed between the first rotor half and the stator, and the third stop surface and the fourth stop surface are axially disposed between the second rotor half and the stator.

[0023] In one embodiment, the axial flux motor is configured as an outer rotor. This means that at least a portion of the rotor carriage, particularly the cylindrical portion, is arranged radially outside the stator and axially overlaps the stator.

[0024] The hub drive device for motor vehicles according to the invention includes an axial flux motor. The hub drive device further includes a wheel carrier, a wheel having a disc and a rim, and a wheel bearing having a first bearing housing anti-torsionally connected to the wheel carrier and a second bearing housing anti-torsionally connected to the rotor. Specifically, a plate portion is provided with a rotor carrier, by means of which the second bearing housing is anti-torsionally connected to the rotor.

[0025] The stator is particularly torsionally connected to the wheel bracket, especially through its stator support. The stator is particularly connected to the stator support on its radially inner side.

[0026] The first bearing housing is specifically the radial outer bearing ring of the wheel bearing, which is fixed to the wheel bracket. The second bearing housing is specifically the radial inner bearing ring of the wheel bearing. The wheel, especially its disc, is screwed onto the second bearing housing.

[0027] In one embodiment, the plate portion is axially arranged between the disk and the stator relative to the rotor's axis of rotation.

[0028] In one embodiment, the hub drive has a braking device having a first braking element, a second braking element, and a friction area, wherein the braking elements can engage frictionally within the friction area.

[0029] In one embodiment of the hub drive, the friction region is axially arranged on the side of the stator facing away from the wheel disk.

[0030] In one embodiment, the first braking element is torsionally connected to the cylindrical portion.

[0031] In one embodiment, the connection point between the first braking element and the cylindrical portion is arranged radially outside the stator.

[0032] In one embodiment, the second braking element is torsionally connected to the wheel bracket.

[0033] In one embodiment, the braking device is configured as a disc brake. The first braking element is a brake ring, also known as a brake disc, and the second braking element is a brake caliper having at least one brake pad.

[0034] In one embodiment, the brake caliper is configured as an inner caliper, meaning the brake caliper is located on the radial inner circumference of the brake ring. In an alternative embodiment, the brake caliper is configured as an outer caliper, meaning it is positioned on the radial outer circumference of the brake ring.

[0035] In another embodiment, the braking device is configured as a drum brake.

[0036] The stop device, especially the cylindrical part combined with the rotor bracket, is particularly used to protect axial flux machines.

[0037] The described axial flux motor and its stopping device are particularly advantageous in the use of the aforementioned axial flux motor in hub drive systems, where, due to various specific influences such as tolerances, wheel bearing stiffness, tilting, and / or external chassis forces, such as when the wheel laterally impacts a curb, the rotor, particularly the corresponding rotor half, may tilt and / or bend. This results in changes in the air gap between the rotor and stator or rotor impact with the stator. This could lead to complete damage to the axial flux motor. The solution described herein prevents this situation, or at least reduces changes in the air gap.

[0038] The stop device ensures that, with the air gap reduced, the first and second stop surfaces, or the third and fourth stop surfaces, abut against each other before the rotor, especially the corresponding rotor half, impacts the stator. In this way, such impact or excessive proximity between the rotor, especially the corresponding rotor half, and the stator is prevented.

[0039] The cylindrical section also contributes to this, because through the cylindrical section, the rotor, especially its two rotor halves, is designed to be axially rigid, at least in the radial region of the cylindrical section, making the rotor, especially the corresponding rotor halves, at least equally difficult to approach, especially excessively close to, the stator in the radial region of the cylindrical section.

[0040] Advantageously, the cylindrical portion is arranged radially outward of the rotor, and the stop is arranged radially inward from the cylindrical portion, particularly in the region radially inward of the rotor. As a result, the rotor, especially the corresponding rotor half, is axially supported relative to the stator in two positions radially offset from each other, which results in particularly effective prevention of impact of the rotor, especially the corresponding rotor half, or even prevention of the rotor, especially the corresponding rotor half, from getting too close to the stator.

[0041] The described solution prevents damage to the axial flux machine.

[0042] Because the stop device is an advantageous design for a sliding bearing—that is, an embodiment in which a first and second stop surface form a sliding bearing, and if present, a third and fourth stop surface also advantageously form a sliding bearing—the contact between the first and second stop surfaces and between the third and fourth stop surfaces can be subjected to more frequent contact than without such a sliding bearing design. In other words, it can withstand more frequent use without excessive wear compared to the absence of such a sliding bearing design. During normal operation of the axial flux machine, the sliding bearing is advantageously not engaged, thus preventing any loss.

[0043] The engagement of the sliding bearing, i.e., the sliding of the first and second stop surfaces against each other and / or (if present) the sliding of the third and fourth stop surfaces against each other, occurs, for example, only when the aforementioned specific effects occur on an axial flux machine. Therefore, the sliding bearing only requires emergency operating characteristics and can thus be implemented simply and economically. Specifically, the first and / or second and / or third and / or fourth stop surfaces are each configured as sliding bearing surfaces, for example, through surface treatments that reduce sliding friction and / or through coatings that reduce sliding friction.

[0044] Sliding bearings also allow for more frequent use of stopping devices, especially in addition to the aforementioned special effects, such as during sporty cornering or emergency braking.

[0045] The described solution allows for a smaller air gap in the axial flux transfer motor, as the aforementioned specific effects need not be covered by the air gap design. A smaller air gap improves the efficiency of the axial flux transfer motor. Furthermore, in the case of the sliding bearing embodiment, the air gap need not be designed for applications different from the aforementioned specific effects, such as dynamic turning or emergency braking.

[0046] For example, stop devices can also be used in radial flux motors. Therefore, the design of the stop device, particularly the design of the first and second stop surfaces, and especially their alignment, is suitable for the design of radial flux motors.

[0047] In the context of this application, the terms "stator" and "rotor" specifically refer to the components that contain coils or magnets in each case. The stator is specifically held on a stator bracket. The rotor is held on a rotor bracket. Therefore, the term "stator" specifically excludes the stator bracket, and the term "rotor" specifically excludes the rotor bracket.

[0048] In the context of this application, the term "wheel" is understood to refer to a unit including both the disc and the rim. Therefore, the rim is simply the radially outer portion of the wheel. The tire is fitted (aufgezogen) onto the rim.

[0049] In the context of this application, the term "outer rotor" is used specifically as follows: the stator is connected to the wheel bracket on its radially inner side. At least one rotor bracket portion is arranged on the radially outer side of the stator.

[0050] The wheel axis of rotation is the axis of rotation of the wheel or rim and disc. In hub drive systems, the wheel axis of rotation is also the axis of rotation of the rotor.

[0051] The terms "axial" and "radial" specifically refer to the axis of rotation of the rotor and / or the axis of rotation of the wheel. When used alone, the term "axial" refers to the axial direction along the axis of rotation. When used alone, the term "radial" refers to the radial direction, that is, the direction perpendicular to the axial direction.

[0052] In the context of this application, the term "torsional" is used as follows: two elements are torsionally connected if they are arranged coaxially with each other (relative to their axis of rotation or axis of rotational symmetry) and are connected to each other such that they always rotate at the same angular velocity. If an element cannot rotate relative to the housing, then the element is torsionally connected to the housing.

[0053] In the context of this application, the term “radial overlap” is used as follows: when two (particularly substantially rotationally symmetric) elements are arranged at least partially in regions having the same radial coordinates (and particularly the same angular coordinates), they are arranged in radial overlap with respect to a common axis.

[0054] In the context of this application, the term "axial overlap" is used as follows: if two elements are arranged in an area at least partially in the same axial coordinate, then the two elements are arranged in an axial overlap with respect to a common axis.

[0055] In the context of this application, "radial interior" specifically refers to something arranged in a region of a smaller radius, particularly relative to the axis of rotation of the wheel and / or the axis of rotation of the rotor.

[0056] In the context of this application, the term "axially inner..." is used specifically as follows: when a first element is axially arranged between a second element and the vehicle center relative to a hypothetical mounting state in the vehicle, the first element is axially arranged within the second element. Relative to a hypothetical mounting state in the vehicle, the axially inner side of the element is the side of the element facing the vehicle center. In the context of this application, the vehicle center specifically refers to the center point of the vehicle on its lateral axis, i.e., the center of the vehicle in the lateral direction.

[0057] In the context of this invention, the expression "two elements are axially rigidly connected" means that the two elements are connected to each other in such a way that they cannot move axially relative to each other, at least in the radial region of their axially rigid connection. Attached Figure Description

[0058] Embodiments of the present invention will now be explained in more detail with reference to the accompanying drawings.

[0059] in:

[0060] Figure 1 A cross-sectional view schematically illustrates an embodiment of a hub drive system for a motor vehicle, and Figure 2 A cross-sectional view of another embodiment of a hub drive system for a motor vehicle is shown schematically.

[0061] Corresponding parts in all the accompanying figures are labeled with the same reference numerals. Detailed Implementation

[0062] Figure 1 and Figure 2 Two embodiments of a hub drive unit 1 for a motor vehicle are shown exemplarily, each in a cross-sectional view. For clarity, the hub drive unit 1 is shown only up to the axis of rotation A, i.e., only half of the hub drive unit 1 is shown, particularly the upper half.

[0063] The hub drive unit 1 has an axial flux motor 2.

[0064] The axial flux transfer motor 2 has a stator 3 and a rotor 4. The rotor 4 is rotatably arranged relative to the stator 3. Furthermore, it is arranged coaxially with the stator 3. In the illustrated embodiment, the rotor 4 has a first rotor half 4.1 and a second rotor half 4.2, wherein the stator 3 is axially arranged between the first rotor half 4.1 and the second rotor half 4.2.

[0065] The axial flux unit 2 also has a rotor bracket 5. The rotor bracket 5 has a cylindrical portion 5.1 arranged to overlap axially with the stator 3 and configured to connect the first rotor half 4.1 to the second rotor half 4.2 in an axially rigid manner.

[0066] In the illustrated embodiment, the cylindrical portion 5.1 is arranged radially outside the stator 3. The cylindrical portion 5.1 has the effect that the rotor halves 4.1 and 4.2 cannot slide axially relative to each other in the radially outer region of the axial flux machine 2, so that the proximity of the rotor halves 4.1 and 4.2 to the stator 3 is also canceled out.

[0067] The hub drive unit 1 also includes a wheel bracket 6, a wheel 7, and a wheel bearing 8.

[0068] In the illustrated embodiment, the stator 3 is torsionally connected to the wheel bracket 6 via the stator bracket 9. In the illustrated embodiment, the stator 3 is connected to the wheel bracket 6 radially inward via the stator bracket 9. Therefore, in the illustrated embodiment, the axial flux motor 2 is configured as an outer rotor.

[0069] The wheel 7 has a disc 7.1 and a rim 7.2.

[0070] The wheel bearing 8 has a first bearing housing 8.1 that is torsionally connected to the wheel bracket 6 and a second bearing housing 8.2 that is torsionally connected to the rotor 4. In the illustrated embodiment, the first bearing housing 8.1 is the radial outer bearing ring of the wheel bearing 8 and is fixed to the wheel bracket, and the second bearing housing 8.2 is the radial inner bearing ring of the wheel bearing 8.

[0071] In the illustrated embodiment, the wheel bracket 6 is torsionally connected to the first bearing housing 8.1 by wheel bracket fastening screws 10. In the illustrated embodiment, these wheel bracket fastening screws 10 pass through the wheel bracket 6 from the axially inner side of the wheel bracket 6 and are screwed into the first bearing housing 8.1 located on the axially outer side of the wheel bracket 6.

[0072] In the illustrated embodiment, the rotor bracket 5 has a plate portion 5.2 through which the rotor 4 is torsionally connected to the second bearing housing 8.2. In the illustrated embodiment, the plate portion 5.2 is axially arranged on the side of the stator 3 facing away from the wheel bracket 6.

[0073] In the illustrated embodiment, the wheel 7, particularly its disc 7.1, is screwed onto the second bearing housing 8.2, specifically by means of wheel bolts 11, which, in the illustrated embodiment, are screwed into the second bearing housing 8.2 from the axially outer side of the disc 7.1 through the disc 7.1 and the plate portion 5.2 of the rotor bracket 5. The plate portion 5.2 of the rotor bracket 5 is axially arranged in the radial region of the second bearing housing 8.2 between the disc 7.1 and the second bearing housing 8.2, particularly against the axially inner side of the disc 7.1 and the axially outer side of the second bearing housing 8.2.

[0074] The plate portion 5.2 is advantageously arranged at the axial end of the cylindrical portion 5.1. Advantageously, the plate portion 5.2 is torsionally and axially fixedly connected to the cylindrical portion 5.1 at the axial end of the cylindrical portion 5.1.

[0075] Advantageously, the cylindrical portion 5.1 has the same outer diameter as the plate portion 5.2.

[0076] Advantageously, the plate portion 5.2 is axially arranged between the rotor 4 and the disk 7.1 relative to the axis of rotation A.

[0077] In the illustrated embodiment, the hub drive device 1 also has a braking device 12, which has a first braking element 12.1 and a second braking element 12.2 and a friction area 13, wherein the braking elements 12.1 and 12.2 can engage frictionally within the friction area.

[0078] In the illustrated embodiment, the friction region 13 is axially arranged between the stator 3 and the wheel bracket 6.

[0079] In the illustrated embodiment, the first braking element 12.1 is torsionally connected to the cylindrical portion 5.1.

[0080] In the illustrated embodiment, the connection point of the first braking element 12.1 is located radially outside the stator 3 on the cylindrical portion 5.1.

[0081] In the example shown, the first braking element 12.1 is torsionally connected to the cylindrical portion 5.1 via the braking element connecting element 14. Thus, the braking element connecting element 14 forms the connection point between the first braking element 12.1 and the cylindrical portion 5.1.

[0082] In the illustrated embodiment, the second braking element 12.2 is torsionally connected to the wheel carrier 6. In the illustrated embodiment, this connection is achieved by a braking element retainer 15.

[0083] In the illustrated embodiment, the braking device 12 is configured as a disc brake. The first braking element 12.1 is a brake ring, also referred to as a brake disc, and the second braking element 12.2 is a brake caliper having at least one brake pad, which has at least one brake lining.

[0084] In the illustrated embodiment, the brake caliper is configured as an inner caliper, meaning the brake caliper is located on the radial inner circumference of the brake ring. In other embodiments, the brake caliper may also be configured as an outer caliper, meaning it is positioned on the radial outer circumference of the brake ring.

[0085] In other embodiments, the braking device 12 may be configured as, for example, a drum brake.

[0086] The axial flux motor 2 also has a stop device 16. The stop device 16 has a first stop surface F1 on the rotor side and a second stop surface F2 on the stator side, and the two stop surfaces F1 and F2 are arranged perpendicular to the rotation axis A of the rotor 4.

[0087] The first stop surface F1 on the rotor side faces the second stop surface F2 on the stator side axially, and the second stop surface F2 on the stator side faces the first stop surface F1 on the rotor side axially. The two stop surfaces F1 and F2 are arranged to overlap radially.

[0088] In the illustrated embodiment, the stop device 16 further has a third stop surface F3 on the rotor side and a fourth stop surface F4 on the stator side, wherein the two stop surfaces F3 and F4 are arranged perpendicular to the rotation axis A of the rotor 4.

[0089] The third stop surface F3 on the rotor side faces the fourth stop surface F4 on the stator side, and the fourth stop surface F4 on the stator side faces the third stop surface F3 on the rotor side. The two stop surfaces F3 and F4 are arranged to overlap radially.

[0090] In the illustrated embodiment, all four stop surfaces F1 to F4 are arranged to overlap radially.

[0091] In the illustrated embodiment, the first stop surface F1 is associated with the first rotor half 4.1, and the third stop surface F3 is associated with the second rotor half 4.2. The corresponding rotor-side stop surfaces F1 and F3 are specifically arranged or formed on the rotor 4, particularly on the corresponding rotor halves 4.1, 4.2 and / or components of the rotor bracket 5.

[0092] The corresponding stator-side stop surfaces F2 and F4 are specifically arranged or formed on the stator 3 and / or stator bracket 9 components.

[0093] The two embodiments differ only in the design of the stop device 16, because Figure 2In the second embodiment shown, the first stop surface F1 and the second stop surface F2 form a sliding bearing G1, and the third stop surface F3 and the fourth stop surface F4 form another sliding bearing G2.

[0094] The corresponding two stop surfaces F1, F2 and F3, F4 can, for example, slide permanently against each other, i.e., the corresponding sliding bearings G1, G2 are then permanently engaged, or, particularly advantageously, the corresponding sliding bearings G1, G2 are constructed as sliding bearings with air gaps. During normal operation of the axial flux unit 2, the corresponding two stop surfaces F1, F2 and F3, F4 are spaced apart from each other, resulting in an air gap between them.

[0095] The corresponding sliding bearings G1 and G2 thus disengage. Then, the corresponding two stop surfaces F1, F2 and F3, F4 advantageously only occasionally impact each other, particularly only under the special influence acting on the axial flux mechanism 2 and causing the rotor 4 and stator 3 to approach each other, and slide against each other. Therefore, the corresponding sliding bearings G1 and G2 are correspondingly only temporarily engaged, or the corresponding sliding bearings G1 and G2 are only temporarily formed by the corresponding two stop surfaces F1, F2 and F3, F4.

[0096] In the illustrated embodiment, the stop device 16 is arranged radially within the cylindrical portion 5.1.

[0097] In the illustrated embodiment, the stop device 16 is arranged to overlap axially with the cylindrical portion 5.1.

[0098] The stop device 16 is arranged radially within the stator 3, for example, radially overlapping the radial inner region of the stator bracket 9, and / or radially overlapping the stator 3.

[0099] The stop device 16 is arranged, for example, radially: - Between the cylindrical portion 5.1 and the stator bracket 9, for example, radially closer to the stator bracket 9, or radially located at the center between the cylindrical portion 5.1 and the stator bracket 9, or radially closer to the cylindrical portion 5.1, and / or - Between the radially outer end of rotor 4 and / or stator 3 and the radially inner end of rotor 4 and / or stator 3.

[0100] The first stop surface F1 and the second stop surface F2 are arranged axially between the first rotor half 4.1 and the stator 3. The third stop surface F3 and the fourth stop surface F4 are arranged axially between the second rotor half 4.2 and the stator 3.

[0101] List of reference numerals 1 hub drive unit 2-axis flux engine 3 stators 4 rotors 4.1, 4.2 Rotor halves 5 rotor brackets 5.1 Cylindrical Part 5.2 Board Section 6 wheel brackets 7 wheels 7.1 Roulette 7.2 Wheel Rim 8 wheel bearings 8.1 First Bearing Housing 8.2 Second Bearing Housing 9 stator brackets 9.1 Stator bracket section 10 Wheel bracket fastening screws 11 wheel bolts 12 Braking devices 12.1 First Braking Element 12.2 Second Braking Element 13 Friction Zones 14 Braking Component Connecting Components 15 Brake Component Retainer 16 Stopping devices A axis of rotation F1, F2, F3, F4 stop surfaces G1 and G2 sliding bearings.

Claims

1. An axial flux engine (2), comprising: -Stator (3) - A rotor (4) coaxial with and rotatably arranged relative to the stator (3), the rotor having a first rotor half (4.1) and a second rotor half (4.2). - Rotor bracket (5), and -A stop device (16), the stop device having a first stop surface (F1) on the rotor side and a second stop surface (F2) on the stator side, wherein, The first stop surface (F1) and the second stop surface (F2) are arranged perpendicular to the rotation axis (A) of the rotor (4), wherein the stop device is arranged radially inside the stator (3). The rotor bracket (5) has a cylindrical portion (5.1) that is axially overlapped with the stator (3) and is configured to connect the first rotor half (4.1) to the second rotor half (4.2) in an axially rigid manner. Its features are, The cylindrical portion (5.1) is arranged radially outside the stator (3).

2. The axial flux engine (2) according to claim 1. Its features are, The stator (3) is axially arranged between the first rotor half (4.1) and the second rotor half (4.2).

3. The axial flux engine (2) according to claim 2. Its features are, The first stop surface (F1) is associated with the first rotor half (4.1).

4. The axial flux engine (2) according to any one of the preceding claims. Its features are, Stator bracket (9), wherein the stator bracket portion (9.1) overlapping with the stator is arranged radially inside the stator and radially inside the stop device (16).

5. The axial flux engine (2) according to any one of the preceding claims. Its features are, The first stop surface (F1) and the second stop surface (F2) are axially disposed between the first rotor half (4.1) and the stator (3), and the third stop surface (F3) and the fourth stop surface (F4) are axially disposed between the second rotor half (4.2) and the stator (3).

6. A hub drive device (1) for a motor vehicle, comprising: -Axial flux machine (2) according to any one of the preceding claims. - Wheel bracket (6). - A wheel (7), which has a disc (7.1) and a rim (7.2), and - Wheel bearing (8), having a first bearing housing (8.1) anti-torsionally connected to the wheel bracket (6) and a second bearing housing (8.2) anti-torsionally connected to the rotor (4), wherein, The plate portion (5.2) provided with the rotor bracket (5) is used to torsionally connect the second bearing housing (8.2) to the rotor (4).

7. The hub drive device (1) according to claim 6. Its features are, The plate portion (5.2) is axially arranged between the disc (7.1) and the stator (3) relative to the rotation axis (A) of the rotor (4).

8. The hub drive device (1) according to claim 6 or 7. Its features are, The braking device (12) has a first braking element (12.1) and a second braking element (12.2) and a friction area (13), wherein the braking elements (12.1, 12.2) are capable of frictional engagement within the friction area, wherein the friction area (13) is axially arranged on the side of the stator (3) facing away from the wheel disc (7.1).

9. The hub drive device (1) according to claim 8. Its features are, The first braking element (12.1) is torsionally connected to the cylindrical portion (5.1).

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