CN117081314B

CN117081314B - Hub motor

Info

Publication number: CN117081314B
Application number: CN202311331256.6A
Authority: CN
Inventors: 鲁查; 吴孔建; 张丹琪; 叶逸祥
Original assignee: Aochuang Power Transmission Shenzhen Co ltd
Current assignee: Aochuang Power Transmission Shenzhen Co ltd
Priority date: 2023-10-16
Filing date: 2023-10-16
Publication date: 2024-01-23
Anticipated expiration: 2043-10-16
Also published as: CN117081314A

Abstract

The invention provides a hub motor, which belongs to the technical field of motors and comprises: a housing; the main shaft is rotationally connected with the shell; a motor stator wound on the main shaft; an armature winding wound around the motor stator; the magnetic steel winding is wound on the inner wall of the shell and fixedly connected with the inner wall of the shell, and the magnetic steel winding and the armature winding are arranged at intervals in the radial direction; the end cover is covered on the opening, wound on the main shaft and rotationally connected with the main shaft; the braking part is alternatively arranged on the inner wall or the outer wall of the shell and the inner wall or the outer wall of the end cover, and forms a braking cavity with the shell or the end cover; and a brake located on the same side as the braking portion; wherein the friction disk is at least partially located in the braking cavity, and the periphery of friction disk has the cooperation portion to realize the braking of shell, magnet steel winding and end cover through the adaptation relation of cooperation portion and braking portion. The whole volume of the hub motor is smaller.

Description

Hub motor

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a hub motor.

Background

The hub motor generally integrates a power system, a transmission system, a brake system and the like, can be applied to running equipment such as vehicles, wheelchairs, intelligent robots and the like, and has the advantages of simplifying the whole structure, realizing complex driving, reducing weight and the like.

In a brake system adopted by a hub motor, the brake system is usually a brake with an inner rotor structure, namely the brake with the inner rotor structure comprises a stator, an armature, a friction disc, a coil, an elastic piece and other parts, the friction disc is provided with a middle hole in the axial direction, the middle hole is matched with a brake shaft, when the electric loss type brake is taken as an example, when the coil is electrified, magnetic force is generated, the armature is attracted by the stator, the friction disc is in a released state and can synchronously rotate along with the brake shaft, when the coil is in the electric loss state, the magnetic force disappears, the armature is reset under the action of the elastic piece, and the friction disc is in a pressed state, so that the friction disc does not synchronously rotate along with the brake shaft any more, and the braking effect on the brake shaft is realized. In such a brake, the middle hole of the friction disc is fitted with the brake shaft through the hub, and is called a brake having an inner rotor structure.

However, such a brake requires a complicated configuration of the transmission mechanism, and thus requires a large installation space, so that the overall volume of the hub motor is large.

Disclosure of Invention

The invention aims to provide a hub motor, which aims to solve the technical problem that a brake adopted by the traditional hub motor needs a larger installation space, so that the whole volume of the hub motor is larger.

In order to achieve the above purpose, the invention adopts the following technical scheme: the present invention provides a hub motor, comprising: the shell is a hollow structure with an opening at one end; the main shaft is rotationally connected with the shell and extends out of the shell; the motor stator is wound on the main shaft and is fixedly connected with the main shaft; the armature winding is wound on the motor stator and is fixedly connected with the motor stator; the magnetic steel winding is wound on the inner wall of the shell, is fixedly connected with the inner wall of the shell, and is radially arranged at intervals with the armature winding; the end cover is covered on the opening, wound on the main shaft and rotationally connected with the main shaft; the braking part is wound on the main shaft and extends in the axial direction, is alternatively arranged on the inner wall or the outer wall of the shell and the inner wall or the outer wall of the end cover, and forms a braking cavity with the shell or the end cover; the brake is positioned on the same side as the braking part and comprises a braking stator, a coil arranged on the braking stator, an elastic piece arranged on the braking stator, an armature arranged adjacent to the braking stator and a friction disc, wherein the friction disc is at least partially positioned in the braking cavity, the periphery of the friction disc is provided with a matching part, the matching part is matched with the braking part, so that the shell, the magnetic steel winding and the end cover are braked, and the radial dimension of the matching part is larger than the outer diameter dimension of the armature; the friction disc is sleeved on the periphery of the braking stator, or the armature is provided with a positioning groove, and the friction disc is positioned on the periphery of the positioning groove.

In some possible implementations, the friction disc is sleeved on the periphery of the braking stator, the periphery of the braking stator is a cylindrical surface parallel to the axial direction, the friction disc is provided with N, N is an integer greater than or equal to 1, the brake further comprises an outer movable plate and (N-1) middle movable plates, and each middle movable plate is positioned between two adjacent friction discs; the brake stator is provided with a first end face and a second end face in the axial direction, the armature is arranged adjacent to the first end face, the periphery of the brake stator is provided with a limit step adjacent to the first end face, and the limit step enables the periphery of the brake stator to form a limit space facing the second end face; the outer movable plate, the middle movable plate and the friction plate are all located in the limiting space, the outer movable plate is adjacent to the second end face, the outer movable plate is fixedly connected with the armature through the assembly part, and the friction plate and the middle movable plate are located between the outer movable plate and the limiting step.

In some possible implementations, the friction discs are located at the periphery of the positioning groove, the friction discs have N, N is an integer greater than or equal to 1, the brake further comprises a tail plate and (N-1) middle movable plates, and each middle movable plate is located between two adjacent friction discs; the braking stator is provided with a first end face and a second end face in the axial direction, the armature is arranged adjacent to the first end face, the tail plate is fixedly connected with the braking stator through an assembly part, and the friction disc and the middle movable plate are positioned between the armature and the tail plate; the armature forms in the terminal surface periphery towards the tailboard the constant head tank, the constant head tank towards the direction of braking stator is sunken to be set up, forms the periphery of constant head tank, the periphery of constant head tank is the face of cylinder that is on a parallel with axial.

In some possible implementations, the detent is located on an inner wall of the housing or an inner wall of the end cap, the motor stator forms a receiving cavity around the spindle, the detent is located at least partially within the receiving cavity, and the detent is located at least partially within the receiving cavity.

In some possible implementations, the motor stator includes: the mounting part is fixed on the main shaft, and the braking stator is sleeved on the mounting part; an extension part connected to the mounting part and located at the periphery of the mounting part and provided with a heat dissipation hole; the support part is connected to the extension part and is positioned at the periphery of the extension part; the size of the mounting part in the axial direction is larger than that of the extending part in the axial direction, the size of the supporting part in the axial direction is larger than that of the extending part in the axial direction, and the mounting part, the extending part and the supporting part form the accommodating cavity.

In some possible implementations, the brake further includes a mount that extends from either side of the brake in an axial direction beyond a locking end of the mount that locks with the extension.

In some possible implementations, the brake further includes a support member, the support member is sleeved on the mounting member, one end of the support member in the axial direction is abutted against the extension portion, and the other end is abutted against the brake stator or the tail plate of the brake, so that the brake and the motor stator are arranged at intervals.

In some possible implementations, the central bore of the braking stator is fixed with the spindle or the motor stator.

In some possible implementations, the braking portion includes a sub-fixing portion and a sub-braking portion connected to each other, the sub-fixing portion extending in an axial direction, the sub-fixing portion being disposed around the main shaft and fixed to the housing or the end cover, the sub-braking portion protruding from the sub-fixing portion and extending in a radial direction, the sub-braking portion being disposed around the main shaft and fitted with the fitting portion.

In some possible implementations, the braking portion includes a plurality of cylinders disposed around the spindle, and a plurality of the cylinders extend in an axial direction and are adapted to the engagement portion to rotate together with the friction disk.

The hub motor provided by the invention has at least the following technical effects: compared with the prior art, in the technical scheme of the invention, the shell, the main shaft, the motor stator, the armature winding, the magnetic steel winding, the end cover, the braking part and the brake are reasonably spatially distributed, the matching part is arranged on the outer periphery outline of the friction disc through the braking part or the end cover, the braking of the shell, the magnetic steel winding and the end cover can be realized through the matching relation between the matching part and the braking part, the friction disc is not matched with the shaft sleeve, the shell, the end cover and the like through the middle hole, the sizes of the braking stator and the armature of the brake can be freely designed, the diameters of the middle holes of the braking stator and the armature can be smaller, the shaft sleeve is not required to be configured, the shapes of the middle holes can be diversified, when the diameters of the middle holes of the braking stator are smaller, the inner diameters and outer diameters of the coils can be smaller, when the inner diameters of the coils are reduced, the coil thicknesses, the coil resistances and the coil currents are unchanged, the coils with more turns can be obtained, the magnetic field is easy to be larger, the number of the coil power is easier to be larger, the coil power is easier to control the volume of the whole motor is larger, and the volume of the brake is smaller, and the volume of the brake is easier to be controlled to be larger.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional view of an in-wheel motor according to an embodiment of the present invention;

FIG. 2 is a perspective cross-sectional schematic view of the in-wheel motor of FIG. 1;

FIG. 3 is a schematic illustration of the engagement of the brake portion and the engagement portion in the in-wheel motor shown in FIG. 1;

FIG. 4 is a schematic structural view of a motor stator of the in-wheel motor of FIG. 1;

FIG. 5 is a schematic cross-sectional view of a hub motor according to another embodiment of the present invention;

FIG. 6 is a perspective cross-sectional schematic view of the in-wheel motor of FIG. 5;

FIG. 7 is a schematic illustration of the engagement of the brake portion with the engagement portion in the in-wheel motor of FIG. 5;

FIG. 8 is a schematic structural view of a motor stator of the in-wheel motor of FIG. 5;

FIG. 9 is a schematic cross-sectional view of a brake according to an embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view of a brake according to another embodiment of the present invention;

FIG. 11 is a schematic cross-sectional view of a brake according to another embodiment of the present invention;

fig. 12 is a schematic view of the structure of the armature in the brake of fig. 10 or 11;

FIG. 13 is a schematic cross-sectional view of a brake according to another embodiment of the present invention;

FIG. 14 is a schematic view of the construction of a brake stator in the brake of FIG. 13;

FIG. 15 is a schematic cross-sectional view of a brake according to another embodiment of the present invention;

fig. 16 is a schematic structural view of a brake stator in the brake of fig. 15.

Reference numerals illustrate:

1. the motor comprises a hub motor, 10, a housing, 20, a main shaft, 30, a motor stator, 31, a mounting part, 32, an extending part, 321, a heat dissipation hole, 33, a supporting part, 34, a containing cavity, 40, an armature winding, 50, a magnetic steel winding, 60, an end cover, 70, a braking part, 71, a sub fixing part, 72, a sub braking part, 73, a braking cavity, 80, a brake, 81, a braking stator 811, a first end surface, 812, a second end surface, 813, a limiting step, 814, a positioning groove, 82, a coil, 83, an elastic piece, 84, an armature, 841, a third end surface, 842, a fourth end surface, 843, a positioning groove, 844, a first corresponding surface, 845, a bending surface, 846, a second corresponding surface, 85, a tail plate, 86, a friction disc, 861, a matching part, 871, an outer movable plate, 872, a middle movable plate, 88, a fitting part 89, a mounting part, 91, a first bearing, 92, a second bearing, 100, and a limiting part.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

When an element is referred to as being "fixed," "secured," "connected," "disposed," "secured" to another element, there may be intervening elements present or absent, both connected and disconnected. Furthermore, when an element is referred to as being "connected" to "another element, it can be construed as being mechanically, electrically, communicatively, etc., as would be conventionally understood by one skilled in the art. Herein, "plurality" refers to two or more numbers; "number" refers to one or more numbers.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Referring to fig. 1 to 16, an in-wheel motor 1 according to an embodiment of the present invention will be described.

Referring to fig. 1 to 9, an embodiment of the present invention provides a hub motor 1, including: a housing 10 having a hollow structure with an opening at one end; a main shaft 20 rotatably connected with the housing 10 and extending from the housing 10; the motor stator 30 is wound on the main shaft 20 and is fixedly connected with the main shaft 20; an armature winding 40 wound around the motor stator 30 and fixedly connected to the motor stator 30; the magnetic steel winding 50 is wound on the inner wall of the shell 10 and fixedly connected with the inner wall of the shell 10, and the magnetic steel winding 50 and the armature winding 40 are arranged at intervals in the radial direction; an end cover 60, which is provided around the main shaft 20 and rotatably connected to the main shaft 20, and covers the opening; a braking portion 70 wound around the main shaft 20 and extending in the axial direction, alternatively arranged on the inner wall or outer wall of the housing 10, the inner wall or outer wall of the end cover 60, and the braking portion 70 and the housing 10 or the end cover 60 form a braking cavity 73; the brake 80, located on the same side as the brake part 70, comprises a brake stator 81, a coil 82 arranged on the brake stator 81, an elastic member 83 arranged on the brake stator 81, an armature 84 arranged adjacent to the brake stator 81, and a friction disk 86, wherein the friction disk 86 is at least partially located in the brake cavity 73, the periphery of the friction disk 86 is provided with a matching part 861, the matching part 861 is matched with the brake part 70, so that the shell 10, the magnetic steel winding 50 and the end cover 60 are braked, and the radial dimension of the matching part 861 is larger than the outer diameter dimension of the armature 84; the friction disk 86 is sleeved on the outer periphery of the brake stator 81, or the armature 84 is provided with a positioning groove 843, and the friction disk 86 is positioned on the outer periphery of the positioning groove 843.

The brake 80 mainly performs a braking function by means of the cooperation of the structures of the braking stator 81, the coil 82, the armature 84, the friction disk 86, the elastic member 83, and the like, wherein when the coil 82 is energized, a magnetic field is generated at the outer periphery of the coil 82, and a magnetic force that attracts each other is generated at the gap between the braking stator 81 and the armature 84.

Specifically, the in-wheel motor 1 includes a stator unit including the main shaft 20, the motor stator 30, and the armature winding 40, and a rotor unit including the housing 10, the magnetic steel winding 50, and the end cover 60. The magnetic steel winding 50 comprises a plurality of magnetic steel sheets, the plurality of magnetic steel sheets are arranged on the inner side wall of the shell 10 at intervals, the inner side wall of the shell 10 is parallel to the axis of the main shaft 20, the magnetic steel winding 50 corresponds to the armature winding 40 in position, and a radial distance is reserved between the magnetic steel winding 50 and the armature winding 40. When the armature winding 40 is energized, the armature winding 40 generates a rotating magnetic field according to the alternating voltage, the magnetic field interacts with the magnetic field generated by the magnetic steel winding 50 and generates tangential electromagnetic traction force to drive the rotor unit to rotate, meanwhile, in a non-braking state, the rotor unit drives the friction disc 86 of the brake 80 to synchronously rotate through the braking part 70, in a braking state, the magnetic force of the brake 80 disappears, the friction disc 86 is directly or indirectly pressed by the armature 84, the friction disc 86 and the rotor unit cannot rotate, and a braking effect on the rotor unit is achieved.

In the embodiment of the present invention, the braking portion 70 may be disposed inside the cavity structure formed by the housing 10 and the end cover 60, specifically may be disposed on the inner wall of the housing 10 facing the end cover 60, or may be disposed on the inner wall of the end cover 60, and in this case, the brake 80 is also disposed inside the cavity structure formed by the housing 10 and the end cover 60. Alternatively, the braking portion 70 may be disposed outside the cavity structure formed by the housing 10 and the end cover 60, specifically, may be disposed on an outer wall of the housing 10 facing away from the end cover 60, or may be disposed on an outer wall of the end cover 60, and in this case, the brake 80 is also disposed outside the cavity structure formed by the housing 10 and the end cover 60. The spindle 20 is rotatably coupled to the housing 10 and the end cap 60 by a first bearing 91 and a second bearing 92, respectively.

When the brake portion 70 is provided on the housing 10, the brake portion 70 and the housing 10 may be integrally formed into a single piece, or the brake portion 70 and the housing 10 may be fixed together by welding, caulking, screwing, clamping, or the like after being formed. Similarly, when the stopper 70 is provided on the end cover 60, the stopper 70 and the end cover 60 may be integrally formed, or the stopper 70 and the end cover 60 may be fixed by welding, caulking, screwing, clamping, or the like after being formed. The shell 10 and the end cover 60 are fixed together by welding, riveting, threaded connection, clamping connection and the like.

In the embodiment of the present invention, the brake 80 may include different combination members according to the overall size of the hub motor 1, which is not limited thereto, so long as the outer circumferential profile of the friction disc 86 of the brake 80 is ensured to have the fitting portion 861, and the rotor unit can be braked by the fitting relationship between the fitting portion 861 and the braking portion 70. The outer circumferential contour of the friction disk 86 can be understood as an outer circumferential surface, which is parallel to the axial direction.

The hub motor 1 provided by the invention has at least the following technical effects: compared with the prior art, in the technical scheme of the invention, the shell 10, the main shaft 20, the motor stator 30, the armature winding 40, the magnetic steel winding 50, the end cover 60, the braking part 70 and the brake 80 are reasonably and spatially distributed, the matching part 861 is arranged on the periphery outline of the friction disc 86 by arranging the braking part 70 on the shell 10 or the end cover 60, the braking of the shell 10, the magnetic steel winding 50 and the end cover 60 can be realized through the matching relation between the matching part 861 and the braking part 70, the friction disc 86 is not matched with the shell 10, the end cover 60 and the like through the middle hole, the middle hole sizes of the braking stator 81 and the armature 84 of the brake 80 can be designed more freely, the middle hole diameters of the braking stator 81 and the armature 84 can be smaller, the shaft sleeve is not required to be arranged, the shape of the middle hole can be more diversified, when the middle hole diameter of the braking stator 81 is smaller, the coil 82 of the brake 80 can be expanded towards the middle hole in the radial direction, the inner diameter and the outer diameter of the coil 82 can be smaller, when the inner diameter and outer diameter of the coil 82 are both reduced, the thickness of the coil 82 and the number of turns of the coil 82 are more easily increased, the magnetic field 82 can be easily controlled, the volume of the coil 82 is more easily is increased, and the volume of the magnetic field is easily can be increased, and the magnetic field is more can be easily controlled, and the whole volume is more has the magnetic field is more increased.

In the embodiment of the present invention, a plurality of adapting modes may be included between the braking portion 70 and the mating portion 861, which is illustrated below, but not limited to the following embodiments.

Referring to fig. 3 and 7, in some embodiments, the braking portion 70 includes a sub-fixing portion 71 and a sub-braking portion 72 connected to each other, the sub-fixing portion 71 extends in an axial direction, is in a ring structure, the sub-fixing portion 71 is disposed around the main shaft 20 and is fixed to the housing 10 or the end cover 60, the sub-fixing portion 71, the sub-braking portion 72 and the housing 10 or the end cover 60 enclose to form a braking cavity 73, the sub-braking portion 72 extends from the sub-fixing portion 71 and extends in a radial direction, and the sub-braking portion 72 is disposed around the main shaft 20 and is adapted to the fitting portion 861.

In this embodiment, the sub-fixing portion 71 may be an annular body surrounding the brake chamber 73, and the annular body is fixed to the housing 10 or the end cover 60 by integral molding, welding, riveting, screwing, fastening, or the like, so that a more sufficient accommodation space in the axial direction can be provided for the brake 80.

The sub-fixing portion 71 may be a plurality of columnar bodies surrounding the brake chamber 73, and the columnar bodies may be regular or irregular, such as prismatic, cylindrical, etc., and may be arranged at intervals and formed in a circle, and may be fixed to the housing 10 or the end cover 60 by means of integral molding, welding, riveting, screwing, clamping, etc., so that a more sufficient accommodation space in the axial direction may be provided for the brake 80, and at the same time, the weight of the brake portion 70 may be reduced, thereby reducing the weight of the entire hub motor 1.

The sub-fixing portion 71 may be a mesh body surrounding the brake cavity 73, and the mesh body may be a regular or irregular shape such as triangle, rectangle, diamond, circle, etc., and the mesh body is disposed around the housing 10 or the end cover 60 by integrally forming, welding, riveting, screwing, clamping, etc., so that a more sufficient accommodation space in the axial direction can be provided for the brake 80, and at the same time, the weight of the brake portion 70 can be reduced, thereby reducing the weight of the whole hub motor 1.

Of course, the sub-fixing part 71 may be of other shapes, and is not limited thereto.

In this embodiment, the sub-braking portion 72 may be a plurality of first concave-convex bodies disposed around the inner ring of the sub-fixing portion 71, and correspondingly, the engaging portion 861 is a plurality of second concave-convex bodies adapted, so that the braking portion 70 and the engaging portion 861 can rotate synchronously around the axis, or the engaging portion 861 can prevent the braking portion 70 from rotating around the axis, and meanwhile, the engaging portion 861 can generate the same or different axial displacement relative to the braking portion 70 according to the number and the position distribution of the friction discs 86.

The cross-sectional shapes of the first concave-convex body and the second concave-convex body are not particularly limited, and may be regular or irregular shapes such as tooth shapes, saw-tooth shapes, rectangular shapes, arc shapes, polygonal shapes, key shapes, and the like. Each first asperity comprises a first groove and a first protrusion connected to each other and extending in a radial direction, and each second asperity comprises a second protrusion and a second groove connected to each other and extending in a radial direction. The shape of the second plurality of asperities is generally identical for each friction disk 86, or may be different or not identical, and correspondingly, the first plurality of asperities also varies adaptively. When the friction plate 86 is provided with a plurality of second concave-convex bodies, the shapes of the second concave-convex bodies of different friction plates 86 are generally identical, or may be all different or not identical, which is not limited.

By providing the first concave-convex body as the first groove and the first projection extending in the radial direction and providing the second concave-convex body as the second projection and the second groove extending in the radial direction, it is possible to ensure that the friction plate 86 has a degree of freedom in the axial direction, thereby more reliably achieving the pressing and releasing of the friction plate 86.

In other embodiments, the braking portion 70 may be a plurality of cylinders disposed about the spindle 20, the plurality of cylinders extending in an axial direction and adapted to engage the engagement portion 861 to rotate the friction disk 86 together. The plurality of columns enclose a braking cavity 73, the columns may be regular or irregular shapes such as prisms, columns, etc., the columns are arranged at intervals and are wound into a circle, and are fixed on the housing 10 or the end cover 60 by means of integral molding, welding, riveting, threaded connection, clamping connection, etc., at this time, the matching portion 861 is also adaptively arranged into a plurality of columnar openings adapted to the columnar bodies, and the columnar openings may be columnar holes or columnar grooves, so that the braking portion 70 and the matching portion 861 may synchronously rotate around the axis through the adapting relationship between the columnar bodies and the columnar openings, or the matching portion 861 may prevent the braking portion 70 from rotating around the axis, and meanwhile, the matching portion 861 may generate the same or different axial displacement relative to the braking portion 70 according to the number and the position distribution condition of the friction discs 86.

Of course, in other embodiments, the braking portion 70 may take other forms, and is not limited thereto.

In order to reduce the overall size of the in-wheel motor 1 and achieve the light weight and miniaturization of the in-wheel motor 1, referring to fig. 1 to 8, in some embodiments, the motor stator 30 is formed with a receiving cavity 34 around the main shaft 20, the braking portion 70 is located on the inner wall of the housing 10 or the inner wall of the end cover 60, the braking portion 70 is located at least partially within the receiving cavity 34, and the brake 80 is located at least partially within the receiving cavity 34.

In this embodiment, the motor stator 30 is configured to have the accommodating cavity 34 disposed around the spindle 20, the brake 80 is disposed around the spindle 20 and partially or entirely located in the accommodating cavity 34, so as to achieve the fit relationship between the fitting portion 861 and the brake portion 70, the brake portion 70 is also partially located in the accommodating cavity 34, that is, the electric transmission mechanism is integrated into the hub motor 1, the electric transmission mechanism is simplified, the axial dimension and the radial dimension of the hub motor 1 are reduced, the overall volume of the hub motor 1 is reduced, the space of the cavity structure formed by the housing 10 and the end cover 60 is more fully utilized, the overall structure and the space distribution are more compact, the power density and the energy transmission efficiency of the hub motor 1 are improved, the output torque, the dynamic response speed and the control precision are improved, the working environment of the brake 80 is not affected by pollutants such as oil stain and dust, the reliability is higher, the failure rate is lower, and the maintenance is more convenient.

In some of these embodiments, the motor stator 30 forms a gap between the inner wall of the receiving cavity 34 and the surface profile of the detent 70. Specifically, the surface profile of the stopper 70 includes an outer wall surface in the axial direction with a radial clearance from the inner axial wall of the accommodation chamber 34, and a radial end surface adjacent to the stopper 80 with an axial clearance from the inner radial wall of the accommodation chamber 34.

That is, there is no contact between the surface profile of the braking portion 70 and the inner wall of the accommodating cavity 34 formed by the motor stator 30, there is no interference between the braking portion 70 and the motor stator 30 during the rotation of the braking portion 70, and the motor stator 30 does not have adverse effects on the rotation of the braking portion 70, so that mechanical damage between the braking portion 70 and the motor stator 30 can be avoided, and a larger safety space is provided for possible shake collision during the rotation.

It will be appreciated that in order to reduce the radial dimension of the motor stator 30, or in order to increase the radial dimension of the brake 70, a first track may be provided on the axially inner wall of the motor stator 30 and a second track may be provided on the axially outer wall of the brake 70, whereby a non-interfering rotational movement of the brake 70 relative to the motor stator 30 is achieved by a non-contact mating relationship of the first track and the second track.

When the brake 70 and the brake 80 are located inside the cavity structure formed by the housing 10 and the end cap 60, referring to fig. 1 to 8, in some embodiments, the motor stator 30 includes: a mounting portion 31 fixed to the main shaft 20, and a brake stator 81 fitted over the mounting portion 31; an extension portion 32 connected to the mounting portion 31, located at the outer periphery of the mounting portion 31, and having a heat dissipation hole 321; and a support portion 33 connected to the extension portion 32 and located at the outer periphery of the extension portion 32; wherein, the armature winding 40 is wound on the supporting portion 33, the dimension of the mounting portion 31 in the axial direction is larger than the dimension of the extending portion 32 in the axial direction, the dimension of the supporting portion 33 in the axial direction is larger than the dimension of the extending portion 32 in the axial direction, and the mounting portion 31, the extending portion 32 and the supporting portion 33 form the accommodating cavity 34.

Specifically, the mounting portion 31 and the main shaft 20 may be in a close fit relationship, for example, an interference fit relationship, or may be in a close fit relationship by a fastener, for example, a screw, a rivet, a pin, a key groove, a spline, or the like, so long as it is ensured that there is no relative rotation relationship between the mounting portion 31 and the main shaft 20.

According to different types of the brake 80, the brake stator 81, the armature 84 and other structures of the brake 80 are directly sleeved on the mounting portion 31, and the friction disc 86 and other structures can be directly or indirectly sleeved on the mounting portion 31, wherein no relative rotation relationship exists between the brake stator 81 and the mounting portion 31, and the middle hole of the armature 84 is not contacted with the brake stator 81, so that normal suction and release of the armature 84 are not affected.

In this embodiment, the contact area between the motor stator 30 and the spindle 20 can be increased by providing the mounting portion 31, so as to ensure the reliability of the fixing action between the motor stator 30 and the spindle 20, and also increase the structural strength of the motor stator 30, and improve the service life of the motor stator 30. By setting the radial dimension of the extension 32, the stopper 80 and the stopper 70 of the preset radial dimension can be adapted. By setting the axial dimension of the support portion 33, the stopper 80 and the stopper portion 70 of a preset axial dimension can be adapted.

In some of these embodiments, the end surface of the detent 80 distal from the detent 70 forms an inner wall of the receiving cavity 34 adjacent the extension 32. In this embodiment, the stopper 80 may include a mounting member 89 mounted to the extension 32 by the mounting member 89, the mounting member 89 protruding from either side of the stopper 80 in the axial direction from a locking end of the mounting member 89, the locking end being locked with the extension 32. The mounting member 89 may be a bolt, a screw, a pin, a rivet, or the like, but the stopper 80 may be attached to the extension 32 by bonding, welding, or clamping, without limitation. By fixing the brake 80 to the inner wall of the extension 32, the sway of the brake 80 during operation can be reduced, the impact and friction generated during operation can be reduced, the mechanical damage of the brake 80 can be reduced, and at the same time, the total thickness of the brake 80 and the motor stator 30 in the axial direction can be reduced, i.e. the brake 80 is entirely accommodated in the accommodating cavity 34 as much as possible, and the overall volume of the hub motor 1 can be reduced.

The brake 80 may further include a supporting member, which is sleeved on the mounting member 89, and one end of the supporting member in the axial direction is abutted against the extension portion 32, and the other end is abutted against the brake stator 81 or the tail plate 85 of the brake 80, so that the brake 80 and the motor stator 30 are disposed at intervals. Specifically, depending on the mounting direction of the brake 80, the support may abut against the first end face 811 or the second end face 812 of the brake stator 81. The mounting position of the brake 80 is adjusted by replacing the supporting pieces of different lengths, which can ensure that the fitting portion 861 is sufficiently contacted with the brake portion 70, and ensure the reliability of the mounting position.

In this embodiment, the brake 80 may be mounted on the extension portion 32 without using the mounting member 89, and may be disposed only in close contact with the inner wall of the extension portion 32, for example, the brake 80 may be disposed in close contact with the inner wall of the extension portion 32 via the brake stator 81, and the brake stator 81 and the extension portion 32 may not have a connection relationship, but may be fixedly connected to the mounting portion 31 via the brake stator 81 to achieve the mounting effect of the brake 80. The brake stator 81 and the mounting portion 31 may be fixed by means of fasteners, bonding, welding, clamping, key-slot, interference fit, or the like.

The above-mentioned laminating mode of the brake 80 can make the axial thickness of the motor stator 30 smaller, so that the brake 80 is entirely accommodated in the accommodating cavity 34 as much as possible, and the overall volume of the hub motor 1 is reduced.

In some of these embodiments, as shown in fig. 8, the extension portion 32 is provided with a plurality of heat dissipation holes 321 in the axial direction. Since some heat is generated during the operation of the rotor unit and during the operation of the brake 80, in order to avoid heat accumulation, the extension portion 32 may be provided with a heat dissipation hole 321 to achieve heat transfer and dissipation. Meanwhile, the mounting portion 31, the extending portion 32 and the supporting portion 33 may be made of a material having good heat dissipation property, so as to improve the heat dissipation effect of the in-wheel motor 1.

Furthermore, in some embodiments, as shown in fig. 4, the mounting portion 31, the extending portion 32, and the supporting portion 33 may form a "" shaped cross-sectional shape, and in other embodiments, as shown in fig. 8, the mounting portion 31, the extending portion 32, and the supporting portion 33 may form a "i" shaped cross-sectional shape, although other similar shapes are possible.

In the embodiment of the present invention, the brake 80 may have various structural forms, and the following illustrates the fitting relation with the motor stator 30 and the brake part 70 when the brake 80 is disposed inside the in-wheel motor 1, but is not limited to the following embodiment.

Referring to fig. 9 to 12, in the first embodiment, the friction disc 86 is located at the periphery of the positioning slot 843, the friction disc 86 has N number, N is an integer greater than or equal to 1, the brake 80 further includes a tail plate 85 and (N-1) intermediate movable plates 872, each intermediate movable plate 872 is located between two adjacent friction discs 86; the braking stator 81 has a first end face 811 and a second end face 812 in the axial direction, the armature 84 is disposed adjacent to the first end face 811, the tail plate 85 is fixedly connected to the braking stator 81 by the fitting 88, and the friction disc 86 and the intermediate movable plate 872 are located between the armature 84 and the tail plate 85; the armature 84 has a positioning groove 843 formed in the outer periphery of the end surface facing the tail plate 85, the positioning groove 843 being recessed toward the brake stator 81, and the outer periphery of the positioning groove 843 being formed as a cylindrical surface parallel to the axial direction. The intermediate flap 872 has a hole or slot that fits the fitting 88, and the intermediate flap 872 slidably fits the fitting 88 to position the intermediate flap 872 such that the intermediate flap 872 cannot rotate with only axial degrees of freedom.

Specifically, the brake stator 81 may also be referred to as a housing, a case, a yoke core, or the like, which are commonly used in the art. The first end surface 811 is provided with a first accommodating groove and a second accommodating groove which are independent of each other, the coil 82 is arranged in the first accommodating groove, the elastic element 83 is arranged in the second accommodating groove, the number of the coil 82 and the first accommodating groove is consistent, one or more of the coils can be arranged, and the number of the elastic element 83 and the second accommodating groove is consistent, one or more of the coils and the second accommodating groove can be arranged. The brake 80 mainly relies on the structural cooperation of a brake stator 81, a coil 82, an armature 84, a friction disk 86, an elastic member 83 and the like to play a role in braking, wherein when the coil 82 is electrified, the periphery of the coil 82 generates a magnetic field, and a gap between the brake stator 81 and the armature 84 generates a magnetic force which is attracted to each other.

In the present embodiment, the armature 84 has a third end face 841 and a fourth end face 842 in the axial direction, the third end face 841 facing the tail plate 85, and the fourth end face 842 facing the braking stator 81; the outer peripheral edge of the third end face 841 is formed with a positioning groove 843 recessed toward the brake stator 81, and a part of the inner peripheral contour of the friction disk 86 is located in the positioning groove 843. By such arrangement, the positioning and limiting actions of the positioning groove 843 can ensure the reliability of the position of the friction disc 86 as much as possible, avoid the friction disc 86 from deviating from the central axis too much, and improve the effectiveness and reliability of braking fit realized through the periphery of the friction disc 86.

Illustratively, as shown in fig. 9, the fourth end surface 842 is a plane, and the first end surface 811 is a plane parallel to the fourth end surface 842, and a portion of the fourth end surface 842 and the first accommodating groove enclose an accommodating space for accommodating the coil 82. The first end surface 811 includes an outer magnetic pole surface and an inner magnetic pole surface disposed about the first receiving groove, and a first air gap and a second air gap are formed between the outer magnetic pole surface and the inner magnetic pole surface and the fourth end surface 842, respectively, the axial thickness of the first air gap being the same or substantially the same as the axial thickness of the second air gap.

Illustratively, as shown in fig. 10 and 12, the fourth end surface 842 is concavely disposed toward a direction away from the braking stator 81, the fourth end surface 842 includes a first corresponding surface 844, a bent surface 845, and a second corresponding surface 846 joined from the edge to the center, the first corresponding surface 844 and the second corresponding surface 846 are disposed offset in the radial direction, and the first end surface 811 includes an outer magnetic pole surface and an inner magnetic pole surface disposed around the first accommodating groove; the first corresponding surface 844 is adjacent to and parallel to the outer magnetic pole surface, the bending surface 845, part of the second corresponding surface 846 and the first accommodating groove enclose to form an accommodating space for accommodating the coil 82, and the other part of the second corresponding surface 846 is adjacent to and parallel to the inner magnetic pole surface. Correspondingly, the outer magnetic pole surface and the inner magnetic pole surface are also arranged in a staggered manner in the radial direction, a first air gap is formed between the first corresponding surface 844 and the outer magnetic pole surface, a second air gap is formed between the second corresponding surface 846 and the inner magnetic pole surface, and the axial thickness of the first air gap is the same as or basically the same as that of the second air gap. The radial width of first counter surface 844 is the same or substantially the same as the radial width of the outer pole surface.

Illustratively, as shown in fig. 11 and 12, the fourth end surface 842 is concavely disposed toward a direction away from the braking stator 81, the fourth end surface 842 includes a first corresponding surface 844, a bent surface 845, and a second corresponding surface 846 joined from the edge to the center, the first corresponding surface 844 and the second corresponding surface 846 are disposed offset in the radial direction, and the first end surface 811 includes an outer magnetic pole surface and an inner magnetic pole surface disposed around the first accommodating groove; the first corresponding surface 844 of part is adjacent to and parallel to the outer magnetic pole surface, the first corresponding surface 844 of the rest, the bending surface 845, the second corresponding surface 846 of part and the first accommodating groove are enclosed to form an accommodating space for accommodating the coil 82, and the second corresponding surface 846 of the rest is adjacent to and parallel to the inner magnetic pole surface. Correspondingly, the outer magnetic pole surface and the inner magnetic pole surface are also arranged in a staggered manner in the radial direction, a first air gap is formed between the first corresponding surface 844 and the outer magnetic pole surface, a second air gap is formed between the second corresponding surface 846 and the inner magnetic pole surface, and the axial thickness of the first air gap is the same as or basically the same as that of the second air gap. The radial width of the first counter surface 844 is greater than the radial width of the outer pole surface.

Because the fourth end surface 842 is concavely arranged towards the direction far away from the braking stator 81, the volume of the accommodating space is increased, and the volume of the coil 82 can be further increased, so that the coil 82 can generate larger magnetic force when being electrified, can overcome larger elastic force and can generate larger braking moment.

Wherein, the included angle between the bending surface 845 and the second corresponding surface 846 is more than or equal to 90 ° and less than 180 °. By adjusting the angle between the bending surface 845 and the second corresponding surface 846, the shape of the accommodating space can be adjusted, and thus the shape of the coil 82 can also be adjusted.

The brake 80 may also include a manual release assembly that acts directly or indirectly on the armature 84 to control the spacing between the brake stator 81 and the armature 84 to effect release and compression of the friction disk 86. The manual release assembly is used in an application scene requiring manual release, so that the release mode of the friction disc 86 is increased, and the convenience and the flexibility of operation are improved. The manual release assembly can specifically be a structure such as a rotary hand wheel, a release screw, a release handle, a wedge block and the like.

In this embodiment, the braking stator 81 has a middle hole, and the second end surface 812 of the braking stator 81 is disposed in close contact with the inner wall of the extension portion 32 by winding the middle hole around the mounting portion 31, and the braking stator 81 may be fastened to the mounting portion 31 by fastening the middle hole, fastening the outer surface of the first end surface 811 or the second end surface 812 or the tail plate 85 to the extension portion 32, or fastening the braking stator 81 to the main shaft 20 or the motor stator 30 by fastening other parts of the braking stator 81 or the tail plate 85 to the main shaft 20, the mounting portion 31, the extension portion 32, or the support portion 33.

For example, the brake stator 81 may be interference fit with the mounting portion 31 through a center hole, or may be keyed with the mounting portion 31 by providing a key groove in the center hole. For another example, the brake stator 81 may be bonded, welded, etc. to the extension 32 via the second end surface 812. For another example, the brake stator 81 may be connected to the extension 32 and the support 33 by a mounting member 89, and the mounting member 89 may be a screw, a bolt, a pin, a rivet, or the like, and the mounting member 89 does not spatially interfere with the coil 82, the elastic member 83, the armature 84, and the friction plate 86, so as to ensure the operational integrity and the undisturbed performance of the respective components.

In addition, the mounting direction of the brake 80 may be changed, and the tail plate 85 and the extension portion 32 may be fixed together by bonding, welding, clamping, or the like.

In this embodiment, by designing the motor stator 30 to have the shape of the accommodating cavity 34, the brake stator 81 is attached to the inner wall of the accommodating cavity 34, and the brake portion 70 is partially located in the accommodating cavity 34, so that the space utilization rate can be greatly increased, the space structure of the motor stator 30 is more fully utilized, and the hub motor 1 is light and thin.

Referring to fig. 13 to 16, in the second embodiment, the friction disc 86 is sleeved on the outer periphery of the brake stator 81, the outer periphery of the brake stator 81 is a cylindrical surface parallel to the axial direction, the friction disc 86 has N number, N is an integer greater than or equal to 1, the brake 80 further includes an outer movable plate 871 and (N-1) middle movable plates 872, each middle movable plate 872 is located between two adjacent friction discs 86; the braking stator 81 has a first end face 811 and a second end face 812 in the axial direction, the armature 84 is provided adjacent to the first end face 811, the outer periphery of the braking stator 81 has a stopper step 813 adjacent to the first end face 811, and the stopper step 813 forms a stopper space toward the second end face 812 on the outer periphery of the braking stator 81; the outer movable plate 871, the middle movable plate 872 and the friction plate 86 are all located in the limiting space, the outer movable plate 871 is adjacent to the second end face 812, the outer movable plate 871 is fixedly connected with the armature 84 through the assembly 88, and the friction plate 86 and the middle movable plate 872 are located between the outer movable plate 871 and the limiting step 813.

When N is 1, as shown in fig. 13, one friction disc 86 is provided, one outer movable plate 871 is provided, the number of intermediate movable plates 872 is zero, one end face of the friction disc 86 is disposed adjacent to the outer movable plate 871, the other end face is disposed adjacent to the limit step 813, and the outer movable plate 871 is fixedly connected to the armature 84 through the fitting 88. When braking is not needed, the coil 82 generates a magnetic field under the condition of electrifying, so that the armature 84 overcomes the elastic force of the elastic piece 83 and moves towards the direction close to the first end face 811, meanwhile, the armature 84 drives the outer movable plate 871 to move towards the direction far away from the first end face 811, further the compression of the outer movable plate 871 on the friction disc 86 is relieved, and the friction disc 86 rotates together through the cooperation of the cooperation part 861 and the braking part 70; when braking is needed, the coil 82 is powered off, under the action of the elastic force of the elastic piece 83, the armature 84 moves in the direction away from the first end face 811, and meanwhile, the outer movable plate 871 is driven to move in the direction close to the first end face 811, so that the outer movable plate 871 compresses the friction plate 86, two end faces of the friction plate 86 are respectively in friction braking with the outer movable plate 871 and the limiting step 813, and the friction plate 86 is matched with the braking part 70 through the matching part 861 to realize braking of the hub motor 1.

When N is greater than 1, as shown in fig. 15, the friction disc 86 is provided with a plurality of outer movable plates 871, one middle movable plate 872 is provided with (N-1), specifically, one or more than one middle movable plates 872, one end surface of the nth friction disc 86 is adjacent to the (N-1) th middle movable plate 872, the other end surface is adjacent to the limit step 813, the outer movable plate 871 is the movable plate farthest from the armature 84, the outer movable plate 871 is fixedly connected with the armature 84 through the fitting 88, no connection relationship exists between the middle movable plate 872 and the armature 84, one middle movable plate 872 is provided between two adjacent friction discs 86, and all the friction discs 86 and all the middle movable plates 872 are arranged between the outer movable plate 871 and the limit step 813.

When braking is not needed, the coil 82 generates a magnetic field under the condition of electrifying, so that the armature 84 moves towards the direction close to the first end face 811 against the elastic force of the elastic piece 83, meanwhile, the armature 84 drives the outer movable plate 871 to move towards the direction far away from the first end face 811, the distance between the outer movable plate 871 and the limiting step 813 is increased, the compression of the outer movable plate 871 and the middle movable plate 872 on the plurality of friction plates 86 is further relieved, and the plurality of friction plates 86 are matched with the braking part 70 to realize rotation together; when braking is needed, the coil 82 is powered off, under the action of the elastic force of the elastic piece 83, the armature 84 moves in the direction away from the first end face 811, and meanwhile, the outer movable plate 871 is driven to move in the direction close to the first end face 811, the distance between the outer movable plate 871 and the limiting step 813 is reduced, the pressing force is transmitted from the outer movable plate 871 to all the friction plates 86 and all the middle movable plates 872, and then the outer movable plate 871 and the middle movable plate 872 press the plurality of friction plates 86, the two end faces of each friction plate 86 are in friction braking with the corresponding outer movable plate 871, middle movable plate 872 and limiting step 813 respectively, and the plurality of friction plates 86 are matched through the plurality of matching parts 861 and the braking parts 70 to realize braking on the hub motor 1.

In order to achieve the positioning effect of the intermediate movable plates 872, as shown in fig. 14 and 16, the inner peripheral profile of each intermediate movable plate 872 has a plurality of positioning projections, and the outer peripheral profile of the brake stator 81 has positioning grooves 814 that are fitted with the positioning projections. The projections of the positioning protrusions of the different middle movable plates 872 on the first end surface 811 may be completely overlapped, may be partially overlapped, or may not be completely overlapped, and the shape and the position of the positioning groove 814 are correspondingly designed according to the shape and the position of the positioning protrusions. The positioning protrusion and the positioning groove 814 are provided such that the intermediate flap 872 cannot rotate, and has only a degree of freedom in the axial direction. The outer movable plate 871 may have a positioning effect by using the fitting 88, and of course, a positioning protrusion may be provided on an inner peripheral contour of the outer movable plate 871, and the fitting 88 may be slidably inserted into the braking stator 81 from the positioning protrusion of the outer movable plate 871 and fixedly connected to the armature 84.

The brake 80 may further include a manual release assembly that acts directly or indirectly on the armature 84 to control the spacing between the armature 84 and the brake stator 81, the spacing between the outboard movable plate 871 and the limit step 813, to effect the distal and proximal movement of the armature 84 relative to the brake stator 81, and the distal and proximal movement of the outboard movable plate 871 relative to the friction disc 86, to effect the release and compression of the friction disc 86. The manual release assembly is used in an application scene requiring manual release, so that the release mode of the friction disc 86 is increased, and the convenience and the flexibility of operation are improved. The manual release assembly can specifically be a structure such as a rotary hand wheel, a release screw, a release handle, a wedge block and the like.

In this embodiment, compared with the conventional technology, N friction discs 86, one outer movable plate 871 and (N-1) middle movable plates 872 are all sleeved on the periphery of the stator, the thickness of the brake 80 is only determined by the thickness of the brake stator 81 and the thickness of the armature 84, compared with the stacked arrangement of the friction discs 86 and the brake stator 81, the outer diameter of the friction region of the friction disc 86 can be increased without increasing the thickness of the brake 80, the braking torque is further increased, the mass of the friction disc 86 can be made smaller, the influence on the total inertia of the hub motor 1 is reduced, the starting and stopping sensitivity of the hub motor 1 is improved, the braking effect is ensured, and because the movable plates have lower production cost than the friction discs 86, the friction discs 86 and the movable plates do not rub with the armatures 84, therefore, only the movable plates need to be replaced during long-term use, dust generated in the friction region contacted by the friction discs 86 and the movable plates does not fall into the brake 80, the faults of the internal components are reduced, the radial dimension of the friction part 861 is larger than the radial dimension of the friction disc 86, the radial dimension of the friction disc 86 is easy to control the radial dimension of the friction disc 86, and the stress is easier to be controlled in the radial dimension of the friction disc 86 and the stress region is easier to be changed, the shape and the stress is easier to be made in the manufacturing plane, and the stress is easier to be compared with the stress region is easier to be changed, and the stress is easier to be compared with the stress to the stress plane.

In this embodiment, the braking stator 81 has a middle hole, and the second end surface 812 of the braking stator 81 is disposed in close contact with the inner wall of the extension portion 32 by winding the middle hole around the mounting portion 31, and the braking stator 81 may be fastened to the mounting portion 31 by the middle hole, or may be fastened to the extension portion 32 by the second end surface 812, or may be fastened to the main shaft 20, the mounting portion 31, the extension portion 32, or the support portion 33 by other portions of the braking stator 81, so as to achieve the fastening relationship between the braking stator 81 and the main shaft 20 or the motor stator 30.

For example, the brake stator 81 may be interference fit with the mounting portion 31 through a center hole, or may be keyed with the mounting portion 31 by providing a key groove in the center hole. For another example, the brake stator 81 may be bonded, welded, etc. to the extension 32 via the second end surface 812. For another example, the brake stator 81 may be connected to the extension 32 and the support 33 by the mounting member 89, and the mounting member 89 may be a screw, a bolt, a pin, a rivet, or the like, and the mounting member 89 does not spatially interfere with the coil 82, the elastic member 83, the armature 84, the friction plate 86, the outer movable plate 871, and the intermediate movable plate 872, thereby ensuring the operational integrity and the undisturbed performance of the respective components.

In addition, the mounting direction of the brake 80 may be changed, that is, the armature 84 is disposed adjacent to the extension portion 32, so that in order to provide a certain axial movement space for the armature 84, the mounting member 89 may protrude from the end of the armature 84 and be locked in the extension portion 32, and a support member is sleeved on the mounting member 89, where the support member is avoided from the armature 84, and locked in the extension portion 32, and two ends of the support member respectively abut against the first end face 811 and the extension portion 32, so that a space is provided between the armature 84 and the extension portion 32.

The plurality of coils 82 in the above embodiment may be provided, and the plurality of coils 82 may be in a series connection relationship or a parallel connection relationship, so that a plurality of power-on modes may be realized, and the magnitude of magnetic force in the brake 80 may be further adjusted, thereby increasing the application scenario of the brake 80.

In the first to second embodiments described above, the braking stator 81 is disposed in contact with the extension portion 32, and in other embodiments, if a sufficient space can be reserved between the extension portion 32 and the brake 80, the friction plate 86 may be disposed on the side close to the extension portion 32, and the braking stator 81 may be disposed on the side away from the extension portion 32.

Of course, in other embodiments, when the brake 80 is disposed outside the in-wheel motor 1, the same structure as the brake 80 in the above embodiments may be adopted, and the main difference is that the brake 80 and the motor stator 30 have no spatial relationship, and the brake 80 may be sleeved on the main shaft 20, or may not be sleeved on the main shaft 20, and the brake 80 may be mounted on other fixing surfaces outside the in-wheel motor 1, so that the structure of the brake 80 itself is not changed and will not be described herein.

It will be appreciated that the portions of the foregoing embodiments may be freely combined or omitted to form different combined embodiments, and the details of the respective combined embodiments are not described herein again, and after this description, it may be considered that the description has already described the respective combined embodiments, and can support the different combined embodiments.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A wheel hub motor, comprising:

the shell is a hollow structure with an opening at one end;

The main shaft is rotationally connected with the shell and extends out of the shell;

the motor stator is wound on the main shaft and is fixedly connected with the main shaft;

the armature winding is wound on the motor stator and is fixedly connected with the motor stator;

the magnetic steel winding is wound on the inner wall of the shell, is fixedly connected with the inner wall of the shell and is radially arranged at intervals with the armature winding;

the end cover is covered on the opening, wound on the main shaft and rotationally connected with the main shaft;

the braking part is wound on the main shaft and extends in the axial direction, is alternatively arranged on the inner wall or the outer wall of the shell and the inner wall or the outer wall of the end cover, and forms a braking cavity with the shell or the end cover; and

the brake is positioned on the same side as the braking part and comprises a braking stator, a coil arranged on the braking stator, an elastic piece arranged on the braking stator, an armature arranged adjacent to the braking stator and a friction disc, wherein the friction disc is at least partially positioned in the braking cavity, the periphery of the friction disc is provided with a matching part, the matching part is matched with the braking part, so that the shell, the magnetic steel winding and the end cover are braked, and the radial dimension of the matching part is larger than the outer diameter dimension of the armature;

The brake comprises a brake stator, a friction disc, an outer movable plate, an inner movable plate, a plurality of middle movable plates, a plurality of brake discs and a plurality of brake discs, wherein the friction disc is sleeved on the outer periphery of the brake stator, the outer periphery of the brake stator is a cylindrical surface parallel to the axial direction, the friction disc is provided with N, N is an integer greater than or equal to 1, the brake further comprises an outer movable plate and N-1 middle movable plates, and each middle movable plate is positioned between two adjacent friction discs;

the brake stator is provided with a first end face and a second end face in the axial direction, the armature is arranged adjacent to the first end face, the periphery of the brake stator is provided with a limit step adjacent to the first end face, and the limit step enables the periphery of the brake stator to form a limit space facing the second end face;

the outer movable plate, the middle movable plate and the friction plate are all positioned in the limiting space, the outer movable plate is arranged adjacent to the second end face, the outer movable plate is fixedly connected with the armature through an assembly part, and the friction plate and the middle movable plate are positioned between the outer movable plate and the limiting step;

or the armature is provided with a positioning groove, the friction discs are positioned at the periphery of the positioning groove, the friction discs are provided with N, N is an integer greater than or equal to 1, the brake also comprises a tail plate and N-1 middle movable plates, and each middle movable plate is positioned between two adjacent friction discs; the braking stator is provided with a first end face and a second end face in the axial direction, the armature is arranged adjacent to the first end face, the tail plate is fixedly connected with the braking stator through an assembly part, and the friction disc and the middle movable plate are positioned between the armature and the tail plate;

The armature forms the positioning groove on the periphery of the end face facing the tail plate, the positioning groove is concavely arranged towards the braking stator to form the periphery of the positioning groove, and the periphery of the positioning groove is a cylindrical surface parallel to the axial direction;

the armature iron is provided with a third end face and a fourth end face in the axial direction, the third end face faces the tail plate and forms the positioning groove, the fourth end face is concavely arranged in the direction away from the braking stator, the fourth end face comprises a first corresponding face, a bending face and a second corresponding face which are connected from the edge to the center, the first corresponding face and the second corresponding face are arranged in a staggered mode in the radial direction, the first end face is provided with a first accommodating groove for accommodating the coil, and the first end face comprises an outer magnetic pole face and an inner magnetic pole face which are arranged around the first accommodating groove; the first corresponding surface is adjacent to and parallel to the outer magnetic pole surface, the bending surface, part of the second corresponding surface and the first containing groove are enclosed to form a containing space for containing the coil, and the rest of the second corresponding surfaces are adjacent to and parallel to the inner magnetic pole surface; or, part of the first corresponding surfaces are adjacent to and parallel to the outer magnetic pole surface, the rest of the first corresponding surfaces, the bending surfaces, part of the second corresponding surfaces and the first accommodating grooves are enclosed to form accommodating spaces for accommodating the coils, and the rest of the second corresponding surfaces are adjacent to and parallel to the inner magnetic pole surface.

2. The in-wheel motor of claim 1, wherein the braking portion is located on an inner wall of the housing or an inner wall of the end cap, the motor stator is formed with a receiving cavity around the main shaft, the braking portion is located at least partially within the receiving cavity, and the brake is located at least partially within the receiving cavity.

3. The in-wheel motor of claim 2, wherein the motor stator includes:

the mounting part is fixed on the main shaft, and the braking stator is sleeved on the mounting part;

an extension part connected to the mounting part and located at the periphery of the mounting part and provided with a heat dissipation hole; and

the support part is connected with the extension part and is positioned at the periphery of the extension part;

the size of the mounting part in the axial direction is larger than that of the extending part in the axial direction, the size of the supporting part in the axial direction is larger than that of the extending part in the axial direction, and the mounting part, the extending part and the supporting part form the accommodating cavity.

4. A hub motor according to claim 3, wherein the brake further comprises a mounting member protruding from either side of the brake in the axial direction from a locking end of the mounting member, the locking end being locked with the extension.

5. The in-wheel motor according to claim 4, wherein the brake further comprises a support member, the support member is sleeved on the mounting member, one end of the support member in the axial direction is abutted against the extension portion, and the other end is abutted against the brake stator or the tail plate of the brake, so that the brake and the motor stator are arranged at intervals.

6. The in-wheel motor of claim 1, wherein the center hole of the brake stator is fixed to the main shaft or the motor stator.

7. The in-wheel motor according to claim 1, wherein the braking portion includes a sub-fixing portion and a sub-braking portion connected to each other, the sub-fixing portion extending in an axial direction, the sub-fixing portion being provided around the main shaft and fixed to the housing or the end cover, the sub-braking portion protruding from the sub-fixing portion and extending in a radial direction, the sub-braking portion being provided around the main shaft and fitted with the fitting portion.

8. The in-wheel motor according to claim 1, wherein the braking portion includes a plurality of columns provided around the main shaft, the plurality of columns extending in an axial direction and adapted to the fitting portion to rotate together with the friction plate.