Electric drive wheel hub and electric drive vehicle having the same

Abstract

The application provides an electric drive wheel hub, wheel hub bearings are arranged between a support main shaft and a wheel hub, a brake unit is arranged close to the wheel hub and at the outer periphery of the wheel hub bearings, an axial magnetic field motor is arranged at the second end of the support main shaft away from the wheel hub, the axial magnetic field motor is formed with a reduction unit mounting cavity by a motor front shell, and the reduction unit is arranged in the mounting cavity at the middle part of the motor front shell. During power output, the axial magnetic field motor works, the motor rotating shaft sleeved on the outer periphery of the support main shaft rotates to output power, the axial magnetic field motor and the brake unit are arranged at the front and back of the motor front shell respectively, and the reduction unit is arranged in the cavity at the middle part of the motor front shell, so that the internal structure of the motor wheel hub is compact, the axial magnetic field motor occupies small axial space, and the whole motor wheel hub obtains compact radial and axial space arrangement. The application also provides an electric drive vehicle.

Description

Technical Field

[0001] This application relates to the field of electric drive hub technology, and more specifically, to an electric drive hub and an electric vehicle having an electric drive hub. Background Technology

[0002] In-wheel motor technology generates power directly within the wheel, simplifying the assembly or conversion process of the entire vehicle. It integrates electronic power modules and digital control functions, enabling direct drive without the need for a transmission device.

[0003] In-wheel motors integrate transmission components such as clutches, gearboxes, drive shafts, differentials, and transfer cases. Some in-wheel motors employ an integrated structure of the motor and reducer, such as a planetary reducer where the motor, sun gear, planetary gears, planet carrier, and reducer ring gear are integrated within the wheel hub. In-wheel motors increase the wheel's mass and rotational inertia, which can affect the vehicle's dynamic performance and handling stability, representing one of the challenges that need to be overcome in the practical application of in-wheel motor integration technology. Summary of the Invention

[0004] In view of this, this application provides an electric drive hub to improve the structural stability of the electric drive hub; this application also provides an electric drive vehicle with an electric drive hub.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An electric drive hub includes a support spindle and a hub that are rotatably supported, and the hub has an axial magnetic field motor, a reduction unit and a braking unit arranged along the axial direction inside.

[0007] The first end of the supporting spindle is connected to the wheel hub through a wheel hub bearing, and the braking unit is arranged on the outer periphery of the wheel hub bearing and on the inner end face of the wheel hub.

[0008] The axial magnetic field motor has a front housing, and a reduction unit mounting cavity is provided in the middle of the front housing, and the reduction unit is arranged in the reduction unit mounting cavity.

[0009] The axial magnetic field motor has a motor shaft, which is fitted onto the outer ring of the supporting main shaft and connected to the reduction unit to output power to the wheel hub.

[0010] The electric drive hub is supported by a main support shaft for rotation. An axial magnetic field motor is used, and power is output through the motor shaft to the reduction unit, and then further output from the reduction unit to the hub. A braking unit is located inside the hub for braking output. A hub bearing is arranged between the main support shaft and the hub, with the braking unit positioned close to the hub and on the outer periphery of the bearing. The axial magnetic field motor is located at the second end of the main support shaft furthest from the hub. The reduction unit is housed within the reduction unit's mounting cavity, formed by the motor's front housing. During power output, the axial magnetic field motor operates, and the motor shaft, fitted around the outer periphery of the main support shaft, rotates to output power. By arranging the axial magnetic field motor and braking unit at the front and rear of the motor's front housing respectively, and placing the reduction unit in the central cavity of the front housing, the internal structure of the motor hub is compact. Furthermore, the small axial space occupied by the axial magnetic field motor allows for a compact radial and axial spatial arrangement of the entire motor hub.

[0011] Optionally, a spindle flange is provided at the second end of the supporting spindle, and the axial magnetic field motor is arranged close to the spindle flange.

[0012] Optionally, the deceleration unit has a front housing, which is fitted into the mounting cavity of the deceleration unit.

[0013] The front housing of the reduction unit is arranged on the inner ring of the front housing of the motor, and the front housing of the reduction unit, the front housing of the motor, and the wheel hub form a brake unit mounting cavity for mounting the brake unit.

[0014] Optionally, the axial magnetic field motor includes a rotor and a stator arranged axially, with the motor shaft arranged in the radial inner ring of the rotor;

[0015] The motor shaft includes a rotor connecting part that connects to the rotor, a rotating support part that is fitted onto the outer periphery of the supporting main shaft, and a radial connecting part that connects the rotor connecting part and the rotating support part.

[0016] The rotor connecting part, the rotating support part, and the radial connecting part form a receiving cavity that accommodates the outer wall surface of the mounting cavity of the deceleration unit.

[0017] Optionally, the axial magnetic field motor further has a rear housing, and the front housing and the rear housing have a first bearing bracket and a second bearing bracket extending to both sides of the radial connection portion, respectively.

[0018] A first bearing is provided between the first bearing bracket and the rotating support portion;

[0019] A second bearing is provided between the second bearing bracket and the rotating support portion.

[0020] Optionally, the rotor includes a first rotor and a second rotor arranged on both sides of the stator axially, and the rotor connection portion is respectively connected to the radial inner rings of the first rotor and the second rotor.

[0021] Optionally, the reduction unit is a planetary gear reduction unit, and the motor shaft is integrally connected to the sun gear of the planetary gear reduction unit;

[0022] The planetary carrier of the planetary gear reduction unit is connected to the hub flange of the hub bearing;

[0023] A third bearing is arranged between the planetary carrier and the front housing of the reduction unit.

[0024] Optionally, the braking unit includes a brake drum press-fitted between the hub flange and the hub, and a brake shoe assembly that engages with the brake drum.

[0025] Optionally, a first oil seal structure is arranged between the axial magnetic field motor and the reduction unit to seal the rotational support position of both.

[0026] A second oil seal structure is arranged between the deceleration unit and the braking unit to seal the rotational support position of both.

[0027] An electric vehicle with an electric drive hub includes a vehicle body and a running wheel for walking, wherein the running wheel is provided with an electric drive hub, and the electric drive hub of the electric vehicle is as described in any of the above-mentioned electric drive hubs.

[0028] The electric vehicle of this embodiment includes the aforementioned electric drive hub, and therefore has the same technical effects as the aforementioned electric drive hub, which will not be repeated here. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the internal layout structure of the electric drive hub provided in this application;

[0031] Figure 2 for Figure 1 Schematic diagram of the internal transmission structure of the electric drive hub;

[0032] Figure 3 for Figure 1 Schematic diagram of the sun gear arrangement structure of the electric drive hub;

[0033] Figure 4 for Figure 1 Schematic diagram of the braking unit layout structure of the electric drive hub;

[0034] Figure 5 for Figure 1 A schematic diagram of the arrangement of the reduction unit mounting cavity in the electric drive hub. Detailed Implementation

[0035] This application discloses an electric drive hub to improve the structural stability of the electric drive hub; this application also provides an electric drive vehicle with an electric drive hub.

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0037] like Figure 1 As shown, Figure 1 A schematic diagram of the internal layout structure of the electric drive hub provided in this application; Figure 2 for Figure 1 Schematic diagram of the internal transmission structure of the electric drive hub; Figure 3 for Figure 1 Schematic diagram of the sun gear arrangement structure of the electric drive hub; Figure 4 for Figure 1 Schematic diagram of the braking unit layout structure of the electric drive hub; Figure 5 for Figure 1 A schematic diagram of the arrangement of the reduction unit mounting cavity in the electric drive hub.

[0038] This application provides an electric drive hub, including a support spindle 1 and a hub 2 that are rotatably supported. The hub 2 contains an axially arranged axial magnetic field motor 3, a reduction unit 4, and a braking unit 5. The axial magnetic field motor 3 has a smaller axial width, resulting in a more compact axial structure for the electric drive hub. The axial magnetic field motor 3 outputs motor power to the reduction unit 4, which further transmits the power to the hub 2. The braking unit 5 is used for braking the hub 2 and cooperates with the braking mechanism of the hub 2.

[0039] The first end of the supporting spindle 1 is connected to the hub 2 via a hub bearing 6. The braking unit 5 is arranged on the outer periphery of the hub bearing 6 and on the inner end face of the hub 2. The supporting spindle 1 and the hub 2 are rotatably connected, with the hub bearing 6 between them. Power is transmitted to the hub flange 61 of the hub bearing 6 via the reduction unit 4. The braking unit 5 is arranged on the outer periphery of the hub bearing 6, specifically on the outer periphery of the hub flange 61. The braking unit 5 brakes the hub via the brake drum 51. In the structural arrangement, the brake drum 51, the hub flange 61, and the hub 2 are assembled and fixed into a single structure. The braking function is achieved by the brake shoe assembly 52 of the braking unit 5 engaging with the brake drum 51.

[0040] The brake shoe assembly 52 contacts and engages with the brake drum 51. When the wheel hub 2 rotates, it separates from the brake drum 51. In terms of structural arrangement, it is installed using the motor housing. Specifically, the axial magnetic field motor 3 has a front motor housing 31, and a reduction unit mounting cavity 311 is provided in the middle of the front motor housing 31. The reduction unit 4 is arranged in the reduction unit mounting cavity 311.

[0041] The axial magnetic field motor 3 has a front housing 31 and a rear housing 32. The front housing 31 is located near the braking unit 5, and the reduction unit mounting cavity 311 is located in the middle of the front housing 31. Thus, the front housing 31 includes an outer annular shell and a central circular cavity structure. By using the annular shell of the front housing 31 to arrange the brake shoe assembly 52 and using the central circular cavity structure as the reduction unit mounting cavity 311, the structural arrangement of the axial magnetic field motor 3, the reduction unit 4, and the braking unit 5 inside the hub 2 is realized.

[0042] During power transmission, the motor shaft 33 and the supporting main shaft 1 adopt a hollow shaft structure. Specifically, the axial magnetic field motor 3 has a motor shaft 33, which is fitted onto the outer ring of the supporting main shaft 1 and connected to the reduction unit 4 to output power to the wheel hub 2. The motor shaft 33 and the supporting main shaft 1 adopt a fitted structure. The motor shaft 33 is a hollow shaft, fitted onto the supporting main shaft 1. The motor main shaft 1 is connected to the reduction unit 4 for power transmission. The reduction unit 4 then transmits the power to the wheel axle flange 61 of the wheel hub bearing 6, thereby driving the wheel hub 2 to rotate, thus realizing power output.

[0043] The electric drive hub is supported by a supporting spindle 1, which rotates the hub 2. An axial magnetic field motor 3 is used, and power is output to the reduction unit 4 through the motor shaft 33, and then further output to the hub 2 from the reduction unit 4. A braking unit 5 is arranged inside the hub 2 for braking output. A hub bearing 6 is arranged between the supporting spindle 1 and the hub 2. The braking unit 5 is arranged close to the hub 2 and on the outer periphery of the hub bearing 6. The axial magnetic field motor 3 is arranged at the second end of the supporting spindle 1 away from the hub 2. The axial magnetic field motor 3 forms a reduction unit mounting cavity 311 in the front housing 31 of the motor, and the reduction unit 4 is arranged in the mounting cavity in the middle of the front housing 31 of the motor. When power is output, the axial magnetic field motor 3 works, and the motor shaft 33, which is mounted on the outer periphery of the supporting main shaft 1, rotates to output power. By arranging the axial magnetic field motor 3 and the braking unit 5 at the front and rear of the motor front housing 31 respectively, and arranging the deceleration unit 4 in the middle cavity of the motor front housing 31, the internal structure of the motor hub is compact. By utilizing the small axial space occupied by the axial magnetic field motor 3, the entire motor hub achieves a compact radial and axial space arrangement.

[0044] Optionally, a main shaft flange 11 is provided at the second end of the supporting main shaft 1, and the axial magnetic field motor 3 is arranged close to the main shaft flange 11. The main shaft flange 11 of the hub motor is a key component for connecting the electric drive hub and the vehicle drive system. By setting the main shaft flange 11 and the supporting main shaft 1 as an integrated structure, the main shaft flange 11 can achieve a firm connection to the hub 2, ensuring that the power of the motor is smoothly transmitted to the wheel and that the supporting structure of the supporting main shaft is stable.

[0045] Optionally, the reduction unit 4 has a reduction unit front housing 41, which is mounted on the reduction unit mounting cavity 311.

[0046] The front housing 41 of the reduction unit is arranged inside the front housing 31 of the motor. The front housing 41 of the reduction unit, the front housing 31 of the motor, and the hub 2 together form a brake unit mounting cavity for mounting the brake unit 5. The reduction unit 4 is arranged in the middle of the front housing 31 of the motor using the reduction unit mounting cavity 311. The front housing 41 of the reduction unit is covered by the reduction unit mounting cavity 311, thus the front housing 31 of the motor and the front housing 41 of the reduction unit form an outer shell structure for mounting the reduction unit 4.

[0047] Meanwhile, the deceleration unit mounting cavity 311 is located in the inner ring of the motor front housing 31, and the outer ring of the motor front housing 31 cooperates with the deceleration unit front housing 41 to form the rear housing of the braking unit 5. The deceleration unit front housing 41 and the motor front housing 31, together with the wheel hub 2, form the braking unit mounting cavity for mounting the braking unit 5.

[0048] Therefore, by utilizing the motor front housing 31 and the reduction unit front housing 41, the axial magnetic field motor 3, the reduction unit 4, and the braking unit 5 form a mutually isolated structure, with all three sharing a single front housing. In this embodiment, the motor front housing 31 and the reduction unit front housing 41 are made of steel to ensure reliable support strength. Specifically, the brake shoe assembly 52 is located at the front of the front housing, the reduction unit 4 is located in the middle cavity of the front housing, and the axial magnetic field motor 3 is located at the rear of the front housing, fixed to the front housing with bolts to improve the stability of the connection structure.

[0049] The front housing structure, consisting of the motor front housing 31 and the reduction unit front housing 41, allows the braking unit 5 to be positioned between the axial magnetic field motor 3 and the wheel hub 2. The brake shoe assembly 52 is integrated into the motor front housing 31 and positioned on the outer ring of the wheel hub bearing 6. The assembly is simply connected by bolts, facilitating maintenance of the braking unit. The wheel hub flange 61 of the wheel hub bearing 6 engages with the reduction unit 4 within the inner ring of the braking unit 5 to output power. The main shaft 1 is interference-fitted with the inner ring of the wheel hub bearing 6, providing overall support for the wheel hub motor system.

[0050] Optionally, the axial magnetic field motor 3 includes a rotor and a stator 34 arranged along the axial direction, and the motor shaft 33 is arranged in the radial inner ring of the rotor; the rotor and stator 34 of the axial magnetic field motor 1 have an annular structure, with the motor shaft 33 in the middle.

[0051] Specifically, the motor shaft 33 includes a rotor connecting part 331 connecting the rotor, a rotating support part 332 fitted around the outer periphery of the supporting main shaft 1, and a radial connecting part 333 connecting the rotor connecting part 331 and the rotating support part 332. The motor shaft 33 drives the rotor to rotate. The rotor connecting part 331 connects to the inner ring of the rotor, and the rotating support part 332 is fitted around the outer periphery of the supporting main shaft 1. The rotating support part 332 has a cylindrical structure and a rotational clearance with the supporting shaft 1. The radial connecting part 333 is provided between the rotating support part 332 and the rotor connecting part 331. Since the motor front housing 31 is recessed into the motor to form the reduction unit mounting cavity 311, the radial connecting part 333 is disc-shaped and has a plate-like structure in the thickness direction, thereby obtaining a smaller axial space occupied.

[0052] In this embodiment, the rotor includes a first rotor 35 and a second rotor 36 arranged on both sides of the stator along the axial direction. The rotor connecting part 331 is connected to the radial inner ring of the first rotor 35 and the second rotor 36 respectively. The axial magnetic field motor 3 has a single stator and dual rotor structure. The stator 34 is fixedly installed inside the motor. The first rotor 35 and the second rotor 36 are distributed on both sides of the stator. The rotor has a ring structure, and the rotor connecting part 331 is connected to the annular inner ring of the rotor.

[0053] Specifically, the rotor connection part 331 is also a ring structure, and it is a closed ring made of a plate with a width greater than the axial width of the stator. The rotor connection part 331 is connected to the inner end faces of the first rotor 35 and the second rotor 36.

[0054] The rotor connecting part 331, the rotating support part 332, and the radial connecting part 333 form a receiving cavity 330 that houses the outer wall surface of the mounting cavity for the reduction unit. The rotor connecting part 331 has an axial length greater than that of the stator 34, and the rotating support part 332 also has an axial length extending to the hub bearing 6. The radial connecting part 333 is an annular vertical plate structure. The rotor connecting part 331, the rotating support part 332, and the radial connecting part 333 form a "C"-shaped motor shaft 33. The motor front housing 31 has a reduction unit mounting cavity 311. The inner wall surface of the motor front housing 31 is recessed inward and serves as the outer wall surface of the reduction unit mounting cavity 311. The motor front housing 31 is recessed and extends into the "C"-shaped receiving cavity of the motor shaft.

[0055] Optionally, the axial magnetic field motor 3 also has a motor rear housing 32, and the motor front housing 31 and the motor rear housing 32 respectively have a first bearing bracket and a second bearing bracket extending to both sides of the radial connection portion 333.

[0056] A first bearing 71 is provided between the first bearing bracket and the rotating support 332;

[0057] A second bearing 72 is provided between the second bearing bracket and the rotating support 332.

[0058] The axial magnetic field motor 3 protects the stator and rotor space through the rear housing 32 and the front housing 31, and also provides external support for the axial magnetic field motor 1. The front housing 31 extends radially outward from the first bearing bracket, and the rear housing 32 extends radially outward from the second bearing bracket. The first and second bearing brackets extend to both sides of the radial connection portion 333 in the thickness direction. Thus, the radial connection portion 333 of the motor shaft 33 is partially located inside the motor housing and partially extends outward from the motor housing.

[0059] The motor shaft 33 has a hollow structure, with a hollowed-out center to accommodate and support the main shaft 1. The rotating support portion 332 of the motor shaft 33 also serves as a bearing bracket. A first bearing 71 is installed between the first bearing bracket and the rotating support portion 332, and a second bearing 72 is installed between the second bearing bracket and the rotating support portion 332. After the axial magnetic field motor 3 is positioned and installed, the rotation of the stator 34 and the rotor drives the motor shaft 33 to rotate. The motor shaft 33 is supported by the first bearing 71 and the second bearing 72, thereby outputting driving force through the motor shaft 33.

[0060] Optionally, the reduction unit 4 is a planetary gear reduction unit, and the motor shaft 33 is integrated with the sun gear 42 of the planetary gear reduction unit;

[0061] The planetary carrier of the planetary gear reduction unit is connected to the hub flange 61 of the hub bearing 6;

[0062] A third bearing 73 is arranged between the planetary carrier and the front housing 41 of the reduction unit 4.

[0063] The reduction unit 4 is a planetary gear reduction unit. The motor outputs power through the motor shaft 33. The power output end of the motor shaft 33 is integrated with the sun gear 42. Thus, the motor power of the axial magnetic field motor 3 is directly output to the sun gear 42. Preferably, the planetary gear reduction unit is a first-stage planetary reduction unit. The sun gear 42 serves as the power output, and the power is output to the hub flange 61 of the rim bearing through the planetary carrier.

[0064] To ensure the rotational stability of the reduction unit 4, the third bearing 73 is supported by the front housing 41 of the reduction unit and the hub flange 61. Specifically, an inner bearing bracket extends from the planetary carrier and is mounted on the outer periphery of the hub flange 61, and an outer bearing bracket is provided on the inner end face of the front housing 41 of the reduction unit. The third bearing 73 is arranged between the inner bearing bracket and the outer bearing bracket.

[0065] Optionally, the braking unit 5 includes a brake drum 51 press-fitted between the hub flange 61 and the hub 2, and a brake shoe assembly 52 that engages with the brake drum 51. The front housing 41 of the reduction unit is fixedly connected to the front housing 31 of the motor. The braking unit 5 is arranged between the axial magnetic field motor 3 and the hub 2. The brake drum 51 of the braking unit 5 is press-fitted between the hub flange 61 and the hub 2, and the two are locked together by bolts. The brake shoe assembly 52 is mounted on the front housing 31 of the motor. This arrangement is simple and facilitates the maintenance of the braking unit 5.

[0066] The electric drive hub provided in this application has a hollowed-out center of the motor shaft 33, through which the supporting main shaft 1 of the hub bearing 6 passes; the outer side of the motor shaft 33 is in a round clearance fit with the inner wall of the stator 34; and the middle of the motor shaft 1 provides space for the motor front housing 31 and the reduction unit 4.

[0067] The motor shaft 33 is supported by two angular contact bearings, which are respectively arranged in the bearing chambers of the front housing 31 and the rear housing 32 of the motor, and are arranged using the internal space of the motor shaft 33.

[0068] The reduction unit 4 is a first-stage planetary reduction assembly. The motor shaft 33 receives power input through the sun gear 42, and the planet carrier outputs power to the outer ring of the hub bearing.

[0069] The braking unit 5, the motor unit, and the reduction unit 4 are isolated from each other by the motor front housing 31; and they share a front housing composed of the motor front housing 31 and the reduction unit front housing 41; the front housing is made of steel to ensure reliable strength; the brake shoe assembly 52 is located at the front of the motor front housing 31; the planetary reduction assembly is located inside the motor front housing 31; the axial magnetic field motor 3 is located at the rear of the front housing and is fixed to the front housing with bolts.

[0070] The braking unit 5 is arranged between the axial magnetic field motor 3 and the wheel hub 2, wherein the brake shoe assembly 52 is integrated on the front housing 31 of the motor; the brake drum 51 is arranged between the wheel hub bearing 61 and the wheel hub 2 and is connected by bolts. This arrangement is simple and facilitates the maintenance of the braking unit.

[0071] The outer ring of the hub bearing 6 is the hub flange 61, which works with the planetary carrier of the reduction unit to output power; the inner ring of the hub bearing 6 is interference-fitted with the support spindle 1, and the support spindle 1 supports the entire hub motor system.

[0072] Optionally, a first oil seal structure is arranged between the axial magnetic field motor 3 and the reduction unit 4 to seal the rotational support position of both.

[0073] A second oil seal structure is arranged between the deceleration unit 4 and the braking unit 5 to seal the rotational support position of both.

[0074] A first bearing 71, a second bearing 72, and a third bearing 73 are respectively installed between the axial magnetic field motor 3 and the reduction unit 4. Therefore, it is necessary to ensure the sealing of the lubricating oil at the bearing positions. The first oil seal structure is for the motor unit seal, and the second oil seal structure is for the reduction unit seal.

[0075] The deceleration unit seal and the motor seal unit consist of a first oil seal 81, a second oil seal 82, a third oil seal 83 and a fourth oil seal 84.

[0076] The first oil seal 81 is arranged between the front housing 41 of the reduction unit and the outer ring of the hub flange 61 to isolate the outside environment; the front housing 41 of the reduction unit is provided with a third bearing 73 to support the front housing 41 of the reduction unit and the hub 2; to ensure that the front housing 41 of the reduction unit and the hub 2 are concentric and can withstand the impact force of both, thus ensuring the sealing reliability of the first oil seal.

[0077] The second oil seal 82 is arranged between the inner ring of the hub bearing 6 and the outer ring of the support spindle 1 to isolate the hub bearing 6.

[0078] The third oil seal 83 is located between the inner ring of the motor shaft 33 and the outer ring of the support shaft 1, and is used to isolate the motor.

[0079] The fourth oil seal 84 is located between the outer ring of the motor shaft 33 and the inner ring of the motor front housing 31 to isolate the inside of the motor.

[0080] Based on the electric drive hub provided in the above embodiments, this application also provides an electric vehicle with an electric drive hub, including a vehicle body and a traveling wheel for walking, wherein the electric drive hub is provided in the traveling wheel, and the electric drive hub provided on the electric vehicle is the electric drive hub provided in the above embodiments.

[0081] Since the electric vehicle with electric drive hub uses the electric drive hub of the above embodiment, please refer to the above embodiment for the beneficial effects brought by the electric drive hub of the electric vehicle with electric drive hub.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric drive wheel hub, characterized in that, It includes a support spindle and a hub that are rotated and supported, wherein the hub has an axially arranged axial magnetic field motor, a reduction unit and a braking unit inside; The first end of the supporting spindle is connected to the wheel hub through a wheel hub bearing, and the braking unit is arranged on the outer periphery of the wheel hub bearing and on the inner end face of the wheel hub. The axial magnetic field motor has a front housing, and a reduction unit mounting cavity is provided in the middle of the front housing, and the reduction unit is arranged in the reduction unit mounting cavity. The axial magnetic field motor has a motor shaft, which is fitted onto the outer ring of the supporting main shaft and connected to the reduction unit to output power to the wheel hub.

2. The electric drive hub according to claim 1, characterized in that, The second end of the supporting spindle is provided with a spindle flange, and the axial magnetic field motor is arranged close to the spindle flange.

3. The electric drive hub according to claim 1, characterized in that, The deceleration unit has a front housing, which is fitted into the mounting cavity of the deceleration unit. The front housing of the reduction unit is arranged on the inner ring of the front housing of the motor, and the front housing of the reduction unit, the front housing of the motor, and the wheel hub form a brake unit mounting cavity for mounting the brake unit.

4. The electric drive hub according to claim 1, characterized in that, The axial magnetic field motor includes a rotor and a stator arranged axially, and the motor shaft is arranged in the radial inner ring of the rotor. The motor shaft includes a rotor connecting part that connects to the rotor, a rotating support part that is fitted onto the outer periphery of the supporting main shaft, and a radial connecting part that connects the rotor connecting part and the rotating support part. The rotor connecting part, the rotating support part, and the radial connecting part form a receiving cavity that accommodates the outer wall surface of the mounting cavity of the deceleration unit.

5. The electric drive hub according to claim 4, characterized in that, The axial magnetic field motor also has a rear housing, and the front housing and the rear housing of the motor respectively have a first bearing bracket and a second bearing bracket extending to both sides of the radial connecting portion; A first bearing is provided between the first bearing bracket and the rotating support portion; A second bearing is provided between the second bearing bracket and the rotating support portion.

6. The electric drive hub according to any one of claims 4 or 5, characterized in that, The rotor includes a first rotor and a second rotor arranged on both sides of the stator axially, and the rotor connection portion is respectively connected to the radial inner rings of the first rotor and the second rotor.

7. The electric drive hub according to claim 1, characterized in that, The reduction unit is a planetary gear reduction unit, and the motor shaft is integrally connected to the sun gear of the planetary gear reduction unit; The planetary carrier of the planetary gear reduction unit is connected to the hub flange of the hub bearing; A third bearing is arranged between the planetary carrier and the front housing of the reduction unit.

8. The electric drive hub according to claim 7, characterized in that, The braking unit includes a brake drum press-fitted between the hub flange and the hub, and a brake shoe assembly that engages with the brake drum.

9. The electric drive hub according to claim 1, characterized in that, A first oil seal structure is arranged between the axial magnetic field motor and the reduction unit to seal the rotational support position of both. A second oil seal structure is arranged between the deceleration unit and the braking unit to seal the rotational support position of both.

10. An electric vehicle with electric drive hubs, characterized in that, The vehicle includes a body and wheels for walking, wherein an electric drive hub is provided in the wheels, and the electric drive hub of the electric vehicle is as described in any one of claims 1-9.

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