Axial flux machine and wheel hub drive device for a motor vehicle

Abstract

The invention relates to an axial flux machine (2) having - a stator (3), - a rotor (4) which is arranged coaxially with respect to the stator (3) and so as to be rotatable relative to the stator (3), - a rotor carrier (5), and - a stop device (16) which has a rotor-side first stop surface (F1) and a stator-side second stop surface (F2), wherein the two stop surfaces (F1, F2) are arranged perpendicularly to an axis of rotation (A) of the rotor (4). The rotor carrier (5) has a cylinder section (5.1) which is arranged in an axially overlapping manner with respect to the stator (3) and is designed to connect a first rotor half (4.1) to a second rotor half (4.2) in an axially rigid manner. The invention also relates to a wheel hub drive device (1) for a motor vehicle.

Description

[0001] Axial flux machine and wheel hub drive device for a motor vehicle

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

[0003] An electric axial flux machine is known from the prior art, as described in DE 102022 111878 A1. The axial flux machine comprises a stator and a rotor rotatable relative to the stator, having a first rotor body in a disk-shaped configuration arranged fixedly with respect to rotation on a rotor shaft, and a second rotor body in a disk-shaped configuration arranged fixedly with respect to rotation on the rotor shaft at an axial distance therefrom. The stator is arranged axially between the first rotor body and the second rotor body. In the torque flux between the first rotor body and the rotor shaft, as well as between the second rotor body and the rotor shaft, a mechanical air gap adjustment is arranged to displace the first rotor body and / or the second rotor body in the axial direction to adjust at least one air gap between one of the rotor bodies and the stator.

[0004] The invention is based on the object of specifying an axial flux machine that is improved compared to the prior art and a wheel hub drive device for a motor vehicle that is improved compared to the prior art.

[0005] The object is achieved according to the invention by an axial flow machine having the features of claim 1 and a wheel hub drive device for a motor vehicle having the features of claim 9.

[0006] Advantageous embodiments of the invention are the subject of the dependent claims. An electric axial flux machine comprises a stator, a rotor arranged coaxially to the stator and rotatable relative to the stator, a rotor carrier, and a stop device. The rotor comprises a first rotor half and a second rotor half, wherein both said rotor halves are advantageously axially spaced from one another. The stop device comprises a first stop surface on the rotor side and a second stop surface on the stator side, wherein the two stop surfaces are arranged perpendicular to a rotational axis of the rotor. The stop device is arranged radially within the stator.

[0007] The rotor carrier has a cylindrical section that is arranged axially overlapping the stator and is designed to axially rigidly connect the first rotor half to the second rotor half. The cylindrical section prevents the two rotor halves from axially approaching each other, at least in the radial region of the cylindrical section, thereby also counteracting an axial approach of the rotor halves to the stator.

[0008] According to the invention, the cylinder section is arranged radially outside the stator.

[0009] In particular, it is provided that the rotor-side first stop surface faces axially toward the stator-side second stop surface, and the stator-side second stop surface faces axially toward the stator-side first stop surface. The two stop surfaces are arranged, in particular, so as to radially overlap.

[0010] Advantageously, the first stop surface and the second stop surface form a plain bearing, in particular only temporarily. The two stop surfaces can, for example, slide against one another permanently, i.e. the plain bearing is then permanently active, or particularly advantageously the plain bearing is designed as a plain bearing with an air gap. In this case, the two stop surfaces are spaced apart from one another during normal operation of the axial flux machine, so that the air gap is present between them. The plain bearing is then therefore not in contact. The two stop surfaces then advantageously only strike one another and slide against one another temporarily, in particular only when special influences act on the axial flux machine which cause the rotor and stator to come closer together. The plain bearing is then accordingly only in contact temporarily. In one embodiment, the stator is arranged axially between the first rotor half and the second rotor half.

[0011] In one embodiment, the first stop surface is associated with the first rotor half.

[0012] The stop device is advantageously arranged radially inside the cylinder section, wherein the cylinder section is arranged radially outside the stator.

[0013] Advantageously, the stop device is arranged axially overlapping the cylinder section.

[0014] In the context of the present invention, the term "stator" refers in particular to a region of stator windings.

[0015] A stator carrier is understood to be a device designed to hold the stator to a wheel carrier of a motor vehicle. The stator carrier is, in particular, a component by means of which the stator, i.e., the area of ​​stator windings, can be connected to the wheel carrier.

[0016] In one embodiment, the stop device has a rotor-side third stop surface and a stator-side fourth stop surface, wherein the two stop surfaces are arranged perpendicular to the axis of rotation of the rotor.

[0017] In particular, it is provided that the rotor-side third stop surface faces axially toward the stator-side fourth stop surface, and the stator-side fourth stop surface faces axially toward the stator-side third stop surface. The two stop surfaces are arranged, in particular, so as to radially overlap.

[0018] In one embodiment, all four stop surfaces are arranged radially overlapping.

[0019] In one embodiment, the third stop surfaces and the fourth stop surface form a plain bearing, in particular only temporarily. The two stop surfaces can, for example, slide permanently on one another, i.e. the plain bearing is then permanently engaged, or particularly advantageously the plain bearing is designed as a plain bearing with an air gap. In this case, the two stop surfaces are spaced apart from one another during normal operation of the axial flux machine, so that the air gap exists between them. The plain bearing is then therefore disengaged. The two stop surfaces then advantageously only strike one another and slide on one another temporarily, in particular only when special influences act on the axial flux machine that cause the rotor and stator to come closer together. The plain bearing is then accordingly only temporarily engaged.

[0020] In one embodiment, the third stop surface is assigned to the second rotor half.

[0021] In one embodiment, the first stop surface and the second stop surface are arranged axially between the first rotor half and the stator and the third stop surface and the fourth stop surface are arranged axially between the second rotor half and the stator.

[0022] In one embodiment, the axial flux machine is designed as an external rotor. This means that at least one section of the rotor carrier, in particular the cylinder section, is arranged radially outside the stator and axially overlapping the stator.

[0023] A wheel hub drive device according to the invention for a motor vehicle comprises the axial flux machine. The wheel hub drive device further comprises, in particular, the wheel carrier, a wheel having a wheel disc and a rim, and a wheel bearing having a first bearing shell connected in a rotationally fixed manner to the wheel carrier and a second bearing shell connected in a rotationally fixed manner to the rotor. In particular, a plate section of the rotor carrier is provided, by means of which the second bearing shell is connected in a rotationally fixed manner to the rotor.

[0024] The stator is connected to the wheel carrier in a rotationally fixed manner, in particular via its stator carrier. The stator is connected to the stator carrier in particular on its radially inner side.

[0025] The first bearing shell is, in particular, a radially outer bearing ring of the wheel bearing, fixed to the wheel carrier. The second bearing shell is, in particular, a radially inner bearing ring of the wheel bearing. The wheel, in particular its wheel disc, is bolted to the second bearing shell. In one embodiment, the plate section is arranged axially between the wheel disc and the stator with respect to the axis of rotation of the rotor.

[0026] In one embodiment, the wheel hub drive device comprises a braking device having a first braking element and a second braking element as well as a friction region within which the braking elements can be brought into frictional engagement.

[0027] In one embodiment of the wheel hub drive device, the friction region is arranged axially on a side of the stator facing away from the wheel disc.

[0028] In one embodiment, the first brake element is connected to the cylinder section in a rotationally fixed manner.

[0029] In one embodiment, a connection point of the first brake element on the cylinder section is arranged radially outside the stator.

[0030] In one embodiment, the second brake element is connected to the wheel carrier in a rotationally fixed manner.

[0031] In one embodiment, the braking device is designed as a disc brake device. The first braking element is a brake ring, also referred to as a brake disc, and the second braking element is a brake caliper with at least one brake block having at least one brake lining.

[0032] In one embodiment, the brake caliper is designed as an inner caliper, i.e., the brake caliper is positioned on a radial inner circumference of the brake ring. In an alternative embodiment, the brake caliper is designed as an outer caliper, i.e., positioned on a radial outer circumference of the brake ring.

[0033] In another embodiment, the braking device is designed as a drum brake.

[0034] The stop device serves, particularly in conjunction with the cylindrical section of the rotor carrier, to protect the axial flux machine. The described axial flux machine and its stop device are particularly advantageous for the above-described use of the axial flux machine in the wheel hub drive device, because in such a wheel hub drive device, tilting and / or bending of the rotor, in particular of the respective rotor half, can occur due to various special influences, for example due to tolerances, wheel bearing stiffness, tilting, and / or external chassis forces, for example when the wheel strikes a curb from the side. This results in a change in the air gap between the rotor and the stator or in the rotor striking the stator. This can lead to total failure of the axial flux machine.The solution described here prevents this or at least reduces the air gap change.

[0035] The stop device ensures that the first stop surface and the second stop surface, or the third stop surface and the fourth stop surface, abut each other when the air gap is reduced, before the rotor, in particular the respective rotor half, abuts the stator. This prevents this abutment or even an excessive approach of the rotor, in particular the respective rotor half, to the stator.

[0036] The cylinder section also contributes to this, because the cylinder section makes the rotor, in particular its two rotor halves, axially rigid at least in the radial region of the cylinder section, so that in the radial region of the cylinder section, an approach, in particular an excessive approach, of the rotor, in particular of the respective rotor half, to the stator is at least made more difficult.

[0037] Advantageously, the cylinder section is arranged on a radially outer side of the rotor, and the stop device is arranged radially offset inward from the cylinder section, in particular in the region of a radially inner side of the rotor. As a result, the rotor, in particular the respective rotor half, is axially supported relative to the stator at two positions arranged radially offset from one another, thereby particularly effectively preventing the rotor, in particular the respective rotor half, from striking or even the rotor, in particular the respective rotor half, from coming too close to the stator.

[0038] The described solution prevents damage to the axial flux machine. Due to the advantageous design of the stop device as a plain bearing, i.e., due to the embodiment in which the first and second stop surfaces form a plain bearing and, if present, the third and fourth stop surfaces advantageously also form a plain bearing, contact between the first and second stop surfaces or between the third and fourth stop surfaces can be tolerated more frequently, i.e., is possible more frequently without excessive wear, than without this plain bearing design. The plain bearing is advantageously not engaged during normal operation of the axial flux machine and therefore generates no losses.

[0039] The engagement of the plain 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 above-mentioned special influences on the axial flux machine occur. The plain bearing therefore only requires emergency running properties and is therefore simple and cost-effective to implement. In particular, the first stop surface and / or the second stop surface and / or the third stop surface and / or the fourth stop surface are each designed as a plain bearing surface, for example, by means of a sliding friction-reducing surface treatment and / or by means of a sliding friction-reducing coating.

[0040] The plain bearing also enables, for example, more frequent use of the stop device, especially beyond the special influences described above, for example during sporty cornering or emergency braking.

[0041] With the described solution, for example, the air gap of the axial flux machine can be designed smaller, since the special influences mentioned above do not have to be accounted for by the air gap design. A smaller air gap increases the efficiency of the axial flux machine. With the plain bearing design, the air gap also does not need to be designed for the aforementioned usage scenarios that deviate from the special influences, such as high-speed cornering or emergency braking.

[0042] The stop device can also be used, for example, in an electric radial flux machine. For this purpose, a design of the stop device, in particular of the first stop surface and the second stop surface, and in particular their orientation, is adapted to the design of the radial flux machine.

[0043] In the context of the present application, the terms "stator" and "rotor" are understood to refer in particular to the components containing coils or magnets. The stator is held in particular on a stator carrier. The rotor is held in particular on a rotor carrier. The term "stator" therefore does not include the stator carrier, and the term "rotor" does not include the rotor carrier.

[0044] In the context of this application, the term "wheel" refers to a unit consisting of a wheel disc and a rim. The rim is therefore only the radially outer part of the wheel. A tire is mounted on the rim.

[0045] In the context of the present application, the term "external rotor" is used in particular as follows: The stator is connected to the wheel carrier on its radially inner side. At least one rotor carrier section is arranged radially outside the stator.

[0046] A wheel axis of rotation is the axis of rotation of the wheel, or rather, the rim and wheel disc. In the case of a wheel hub drive device, the wheel axis of rotation is also the axis of rotation of the rotor.

[0047] The terms "axial" and "radial" refer specifically to the rotor's rotational axis and / or the wheel's rotational axis. The term "axial," when used alone, means an axial direction along the specified rotational axis. The term "radial," when used alone, indicates a radial direction, i.e., a direction perpendicular to the axial direction.

[0048] In the context of the present application, the term "rotationally fixed" is used as follows: Two elements are rotationally fixed if they are arranged coaxially to one another (relative to their axis of rotation or to an axis of rotational symmetry) and if they are connected to one another in such a way that they always rotate at the same angular velocity. An element is rotationally fixed to a housing if it cannot be rotated relative to the housing. 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 each at least partially arranged in a region of the same radial coordinates (and in particular the same angular coordinates).

[0049] 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.

[0050] In the context of the present application, "radially within..." means in particular that something is arranged in a region of smaller radii, in particular with respect to the wheel rotation axis and / or the rotor rotation axis.

[0051] In the context of the present application, the term "axially within..." is used in particular as follows: A first element is arranged axially within a second element if, with respect to the assumed installed state in the vehicle, it is arranged axially between the second element and a vehicle center. An axial inner side of an element is, with respect to the assumed installed state in the vehicle, a side of the element facing the vehicle center. The vehicle center 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 vehicle center in the transverse direction of the vehicle.

[0052] In the context of the present invention, the expression that two elements are axially rigidly connected means that the two elements are connected to one another in such a way that they cannot move axially relative to one another, at least in the radial region of their axially rigid connection.

[0053] Embodiments of the invention are explained in more detail below with reference to drawings.

[0054] Shown are: Fig. 1 schematically a sectional view of an embodiment of a

[0055] Wheel hub drive device for a motor vehicle, and

[0056] Fig. 2 shows a schematic sectional view of another embodiment of a

[0057] Wheel hub drive device for a motor vehicle.

[0058] Corresponding parts are provided with the same reference numerals in all figures.

[0059] Figures 1 and 2 show, by way of example, two embodiments of a wheel hub drive device 1 for a motor vehicle, each in a sectional view. For reasons of clarity, the wheel hub drive device 1 is shown only up to a rotational axis A, i.e., only one, in particular upper, half of the wheel hub drive device 1 is shown.

[0060] The wheel hub drive device 1 has an axial flux machine 2.

[0061] The axial flux machine 2 has a stator 3 and a rotor 4. The rotor 4 is arranged to be rotatable relative to the stator 3. It is also arranged coaxially to the stator 3. In the illustrated embodiments, the rotor 4 has a first rotor half 4.1 and a second rotor half 4.2, with the stator 3 being arranged axially between the first rotor half 4.1 and the second rotor half 4.2.

[0062] The axial flux machine 2 further comprises a rotor carrier 5. The rotor carrier 5 has a cylinder section 5.1, which is arranged axially overlapping the stator 3 and is designed to axially rigidly connect the first rotor half 4.1 to the second rotor half 4.2.

[0063] In the illustrated embodiments, the cylinder section 5.1 is arranged radially outside the stator 3. Among other things, the cylinder section 5.1 prevents the rotor halves 4.1, 4.2 from axially shifting relative to one another in a radially outer region of the axial flux machine 2, thus also counteracting any approach of the rotor halves 4.1, 4.2 to the stator 3. The wheel hub drive device 1 further comprises a wheel carrier 6, a wheel 7, and a wheel bearing 8.

[0064] In the illustrated embodiments, the stator 3 is connected to the wheel carrier 6 in a rotationally fixed manner via a stator carrier 9. In the illustrated embodiments, the stator 3 is connected to the wheel carrier 6 on its radially inner side via the stator carrier 9. The axial flux machine 2 is thus designed as an external rotor in the illustrated embodiments.

[0065] The wheel 7 has a wheel disc 7.1 and a rim 7.2.

[0066] The wheel bearing 8 has a first bearing shell 8.1 that is non-rotatably connected to the wheel carrier 6 and a second bearing shell 8.2 that is non-rotatably connected to the rotor 4. In the illustrated embodiments, the first bearing shell 8.1 is a radially outer bearing ring of the wheel bearing 8 that is fixed to the wheel carrier, and the second bearing shell 8.2 is a radially inner bearing ring of the wheel bearing 8.

[0067] In the illustrated embodiments, the wheel carrier 6 is connected to the first bearing shell 8.1 in a rotationally fixed manner by means of wheel carrier fastening screws 10. In the illustrated embodiments, these wheel carrier fastening screws 10 are screwed from an axial inner side of the wheel carrier 6 through the wheel carrier 6 into the first bearing shell 8.1 arranged on an axial outer side of the wheel carrier 6.

[0068] In the illustrated embodiments, the rotor carrier 5 has a plate section 5.2, by means of which the rotor 4 is rotationally fixedly connected to the second bearing shell 8.2. In the illustrated embodiments, this plate section 5.2 is arranged axially on a side of the stator 3 facing away from the wheel carrier 6.

[0069] In the illustrated embodiments, the wheel 7, in particular its wheel disc 7.1, is screwed to the second bearing shell 8.2, in particular by means of wheel bolts 11, which in the illustrated embodiments are screwed from an axial outer side of the wheel disc 7.1 through the wheel disc 7.1 and the plate section 5.2 of the rotor carrier 5 into the second bearing shell 8.2. The plate section 5.2 of the rotor carrier 5 is arranged in the radial region of the second bearing shell 8.2 axially between the wheel disc 7.1 and the second bearing shell 8.2, in particular abutting an axial inner side of the wheel disc 7.1 and an axial outer side of the second bearing shell 8.2.

[0070] Advantageously, the plate section 5.2 is arranged at an axial end of the cylinder section 5.1. Advantageously, the plate section 5.2 is connected to the cylinder section 5.1 at the axial end of the cylinder section 5.1 in a rotationally fixed and axially fixed manner.

[0071] Advantageously, the cylinder section 5.1 has the same outer diameter as the plate section 5.2.

[0072] Advantageously, the plate section 5.2 is arranged axially between the rotor 4 and the wheel disc 7.1 with respect to the rotational axis A.

[0073] In the illustrated embodiments, the wheel hub drive device 1 further comprises a braking device 12, which has a first braking element 12.1 and a second braking element 12.2 as well as a friction region 13, within which the braking elements 12.1, 12.2 can be brought into frictional engagement.

[0074] In the illustrated embodiments, the friction region 13 is arranged axially between the stator 3 and the wheel carrier 6.

[0075] In the illustrated embodiments, the first brake element 12.1 is connected in a rotationally fixed manner to the cylinder section 5.1.

[0076] In the illustrated embodiments, a connection point of the first brake element 12.1 on the cylinder section 5.1 is arranged radially outside the stator 3.

[0077] In the illustrated examples, the first brake element 12.1 is connected to the cylinder section 5.1 in a rotationally fixed manner via a brake element connection element 14. This brake element connection element 14 thus forms the connection point of the first brake element 12.1 to the cylinder section 5.1. In the illustrated embodiments, the second brake element 12.2 is connected to the wheel carrier 6 in a rotationally fixed manner. This connection is realized in the illustrated embodiments by a brake element holder 15.

[0078] In the illustrated embodiments, the braking device 12 is designed as a disc brake device. 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 with at least one brake block having at least one brake lining.

[0079] In the illustrated embodiments, the brake caliper is designed as an inner caliper, i.e., the brake caliper is positioned on a radial inner circumference of the brake ring. In other embodiments, the brake caliper can also be designed as an outer caliper, i.e., positioned on a radial outer circumference of the brake ring.

[0080] In other embodiments, the braking device 12 may be designed, for example, as a drum brake.

[0081] The axial flux machine 2 further comprises a stop device 16. The stop device 16 has a rotor-side first stop surface Fl and a stator-side second stop surface F2, wherein the two stop surfaces Fl, F2 are arranged perpendicular to the rotational axis A of the rotor 4.

[0082] The rotor-side first stop surface Fl faces axially toward the stator-side second stop surface F2, and the stator-side second stop surface F2 faces axially toward the stator-side first stop surface Fl. The two stop surfaces Fl, F2 are arranged radially overlapping.

[0083] In the illustrated embodiments, the stop device 16 also has a rotor-side third stop surface F3 and a stator-side fourth stop surface F4, wherein the two stop surfaces F3, F4 are arranged perpendicular to the rotational axis A of the rotor 4.

[0084] The rotor-side third stop surface F3 faces axially toward the stator-side fourth stop surface F4, and the stator-side fourth stop surface F4 faces axially toward the stator-side third stop surface F3. The two stop surfaces F3, F4 are arranged radially overlapping.

[0085] In the illustrated embodiments, all four stop surfaces Fl to F4 are arranged radially overlapping.

[0086] In the illustrated embodiments, the first stop surface F1 is assigned to the first rotor half 4.1, and the third stop surface F3 is assigned to the second rotor half 4.2. The respective rotor-side stop surface F1, F3 is arranged or formed in particular on the rotor 4, in particular on the respective rotor half 4.1, 4.2, and / or on a component of the rotor carrier 5.

[0087] The respective stator-side stop surface F2, F4 is arranged or formed in particular on the stator 3 and / or on a component of the stator carrier 9.

[0088] The two embodiments differ in particular only in the design of the stop device 16, because in the second embodiment shown in Figure 2, the first stop surfaces Fl and the second stop surface F2 form a sliding bearing G1 and the third stop surfaces F3 and the fourth stop surface F4 form a further sliding bearing G2.

[0089] The two respective stop surfaces Fl, F2 and F3, F4 can, for example, slide permanently against each other, i.e., the respective plain bearing Gl, G2 is then permanently engaged, or, particularly advantageously, the respective plain bearing Gl, G2 is designed as a plain bearing with an air gap. In this case, the two respective stop surfaces Fl, F2 and F3, F4 are spaced apart from each other during normal operation of the axial flux machine 2, so that the air gap is present between them.

[0090] The respective plain bearing Gl, G2 is then disengaged. The respective two stop surfaces Fl, F2 and F3, F4 then advantageously only strike each other and slide against each other temporarily, in particular only when special influences act on the axial flux machine 2 that cause the rotor 4 and stator 3 to approach each other. The respective plain bearing Gl, G2 is then accordingly only temporarily engaged, or the respective plain bearing Gl, G2 is only temporarily formed by the respective two stop surfaces Fl, F2 and F3, F4. In the illustrated embodiments, the stop device 16 is arranged radially within the cylinder section 5.1.

[0091] In the illustrated embodiments, the stop device 16 is arranged axially overlapping the cylinder section 5.1.

[0092] The stop device 16 is arranged, for example, radially inside the stator 3, for example radially overlapping a radially inner region of the stator carrier 9, and / or radially overlapping the stator 3.

[0093] The stop device 16 is arranged, for example:

[0094] - radially between the cylinder section 5.1 and the stator carrier 9, for example radially closer to the stator carrier 9 or radially centrally between the cylinder section 5.1 and the stator carrier 9 or radially closer to the cylinder section 5.1, and / or

[0095] - radially between a radially outer end of the rotor 4 and / or the stator 3 and a radially inner end of the rotor 4 and / or the stator 3.

[0096] The first stop surface F1 and the second stop surface F2 are arranged, in particular, 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, in particular, axially between the second rotor half 4.2 and the stator 3.

[0097] List of reference symbols

[0098] 1 wheel hub drive device

[0099] 2 axial flux machine

[0100] 3 Stator

[0101] 4 Rotor

[0102] 4.1, 4.2 Rotor half

[0103] 5 rotor carriers

[0104] 5.1 Cylinder section

[0105] 5.2 Plate section

[0106] 6 wheel carriers

[0107] 7 wheel

[0108] 7.1 Wheel disc

[0109] 7.2 Rim

[0110] 8 wheel bearings

[0111] 8.1 first bearing shell

[0112] 8.2 second bearing shell

[0113] 9 Stator carrier

[0114] 9.1 Stator carrier section

[0115] 10 wheel carrier fastening screw

[0116] 11 Wheel bolt

[0117] 12 Braking device

[0118] 12.1 first brake element

[0119] 12.2 second brake element

[0120] 13 Friction area

[0121] 14 Brake element connection element

[0122] 15 brake element holder

[0123] 16 Stop device

[0124] A axis of rotation

[0125] Fl, F2, F3, F4 stop surface

[0126] Gl, G2 plain bearings

Claims

Patent claims 1. Axial flow machine (2), comprising - a stator (3), - a rotor (4) arranged coaxially to the stator (3) and rotatable relative to the stator (3), which rotor has a first rotor half (4.1) and a second rotor half (4.2), - a rotor carrier (5), and - a stop device (16) which has a rotor-side first stop surface (Fl) and a stator-side second stop surface (F2), wherein the two stop surfaces (Fl, F2) are arranged perpendicular to a rotational axis (A) of the rotor (4), wherein the stop device is arranged radially inside the stator (3), wherein the rotor carrier (5) has a cylinder section (5.1) which is arranged axially overlapping the stator (3) and is designed to connect the first rotor half (4.1) axially rigidly to the second rotor half (4.2), characterized in that the cylinder section (5.1) is arranged radially outside the stator (3).

2. Axial flux machine (2) according to claim 1, characterized in that the stator (3) is arranged axially between the first rotor half (4.1) and the second rotor half (4.2).

3. Axial flux machine (2) according to claim 2, characterized in that the first stop surface (Fl) is assigned to the first rotor half (4.1).

4. Axial flow machine (2) according to one of the preceding claims, characterized by a stator support (9), wherein a stator support section (9.1) overlapping with the stator is arranged radially inside the stator and radially inside the stop device (16).

5. Axial flux machine (2) according to one of the preceding claims, characterized in that the first stop surface (Fl) and the second stop surface (F2) are arranged axially between the first rotor half (4.1) and the stator (3) and a third stop surface (F3) and a fourth stop surface (F4) are arranged axially between the second rotor half (4.2) and the stator (3).

6. Wheel hub drive device (1) for a motor vehicle, comprising - an axial flow machine (2) according to one of the preceding claims, - a wheel carrier (6), - a wheel (7) having a wheel disc (7.1) and a rim (7.2), and - a wheel bearing (8) which has a first bearing shell (8.1) connected in a rotationally fixed manner to the wheel carrier (6) and a second bearing shell (8.2) connected in a rotationally fixed manner to the rotor (4), wherein a plate section (5.2) of the rotor carrier (5) is provided, by means of which the second bearing shell (8.2) is connected in a rotationally fixed manner to the rotor (4).

7. Wheel hub drive device (1) according to claim 6, characterized in that the plate section (5.2) is arranged axially between the wheel disc (7.1) and the stator (3) with respect to the axis of rotation (A) of the rotor (4).

8. Wheel hub drive device (1) according to claim 6 or 7, characterized by a braking device (12) which has a first braking element (12.1) and a second braking element (12.2) as well as a friction region (13) within which the braking elements (12.1, 12.2) can be brought into frictional engagement, wherein the friction region (13) is arranged axially on a side of the stator (3) facing away from the wheel disc (7.1). is arranged.

9. Wheel hub drive device (1) according to claim 8, characterized in that the first brake element (12.1) is connected in a rotationally fixed manner to the cylinder section (5.1).

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