A hub-integrated integrated electric wheel set and a vehicle comprising the same

Abstract

The application discloses a kind of integrated electric wheel groups of built-in hub and vehicle comprising the electric wheel group, the electric wheel group includes two-stage reducer, caliper disc brake, motor, wheel group shell, support sleeve, hub assembly and rim, the first-stage reducer of two-stage reducer is fixed axle train reducer, and the second-stage reducer is NGW reducer;The hub assembly includes hub, hub bearing, hub oil seal and fastening sleeve, located between the second-stage NGW reducer and the first-stage fixed axle train reducer.The hub is built-in in the application, arranges the axial distribution of power system, transmission system, braking system, realizes motor power, hub brake braking force, steering power, whole vehicle on rim load capacity, and ground on the rim of reasonable transmission, distribution of force;Brake and hub are connected, reduce brake action time, prolong the service life of brake.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric wheel set, in particular to a wheel hub integrated electric wheel set and a vehicle comprising the same. BACKGROUND

[0002] The electric drive assembly is a very important component of electric vehicles. At present, the driving modes of electric vehicles are divided into central motor driving and electric wheel driving. The power distribution of the central motor driving mode basically depends on the mechanical transmission mechanism. This mode has low efficiency and poor vehicle comfort. The latter electric wheel set designs the power system, transmission system, braking system, steering system interface, suspension system interface, etc. in the wheel set, highly integrates the mechanical part of the electric vehicle, has the advantages of high transmission efficiency and convenient modular arrangement.

[0003] For electric vehicles, especially off-road vehicles with complex working road surfaces such as mud and mountains, the vehicle power demand, unsprung mass, ground clearance, hub axial and radial space have strict limitations. The existing drum brake system has poor thermal stability, the axial size is too long, and it is difficult to disassemble and assemble, which cannot meet the requirements of the compact space height of the electric wheel. Therefore, the electric wheel set scheme using a disc brake and a large transmission reducer is more suitable.

[0004] The patent with publication number CN210234643U discloses an integrated disc type wheel hub motor and reducer drive and brake integrated electric wheel and automobile. The electric wheel adopts a one-stage planetary reducer, and the driving torque and output power are limited, which is not conducive to improving the acceleration and climbing ability of the vehicle. The brake is arranged at the end of the motor shaft, which requires high brake speed and reduces the service life.

[0005] The disclosed technology "A high-speed wheel rim motor drive system speed reduction mechanism based on a composite planetary gear train" (publication number: CN113752821A) discloses a high-speed wheel rim motor drive system speed reduction mechanism based on a composite planetary gear train, including a motor mechanism, a double planetary gear train mechanism, and a wheel mechanism. The output shaft of the device is too long, the center line of the wheel rim is located at the output shaft suspension, the bearing is used in a harsh environment, the service life is shortened, and it is not conducive to large-tonnage load bearing. The patent with publication number CN108128143A discloses an integrated electric wheel and vehicle, which integrates a wheel hub motor and a one-stage planetary reducer. The electric wheel is connected to the steering knuckle end cover and the suspension structure by the outermost wheel hub motor end, which cannot fully apply the axial distance from the electric wheel set to the vehicle center, and the suspension structure design space is limited, which is not conducive to improving the up-and-down movement of the wheel and cannot meet the high-passability obstacle requirements of off-road vehicles. SUMMARY

[0006] In order to overcome the deficiencies of the prior art, the application provides a wheel hub integrated electric wheel set and a vehicle comprising the electric wheel set, which meets the requirements of high climbing gradient while taking into account the highest speed of the wheel set, and increases the ground clearance of the vehicle by eccentrically suspending the motor, thereby improving the passability of the vehicle.

[0007] As a first aspect of the application, a wheel hub integrated electric wheel set is provided, comprising a two-stage reducer, a caliper disc brake, a motor, a wheel set shell, a support sleeve, a wheel hub assembly and a rim, the two-stage reducer comprising a primary reducer and a secondary reducer connected to each other; the caliper disc brake comprising a brake disc and a brake caliper;

[0008] The wheel set shell comprises an end cover, a middle section shell and an input end shell; one end of the input end shell is connected to the motor housing, and the other end is connected to the middle section shell;

[0009] The motor is located outside the rim and is installed in the motor housing;

[0010] The primary reducer is located in the middle section shell and is connected to the motor through an input gear shaft; the secondary reducer is located between the end cover and the wheel hub assembly;

[0011] The wheel hub assembly is located between the secondary reducer and the primary reducer and is fixedly connected to the rim and the brake disc, respectively;

[0012] One end of the support sleeve is fixedly connected to the middle section shell, and the other end penetrates through the wheel hub assembly.

[0013] Preferably, the wheel hub assembly comprises a wheel hub body, a wheel hub bearing and a fastening sleeve; the wheel hub bearing is located inside the wheel hub body and between the wheel hub body and the support sleeve; the fastening sleeve is fixedly connected to the rightmost end of the wheel hub body, and a wheel hub oil seal is arranged between the wheel hub bearing and the fastening sleeve.

[0014] Preferably, a plurality of reinforcing ribs are uniformly arranged on the side of the wheel hub body facing the wheel hub bearing, and the wheel hub reinforcing ribs are fixedly connected to the brake disc.

[0015] Preferably, the primary reducer is a fixed shaft wheel train reducer, and the secondary reducer is an NGW reducer.

[0016] The use of the fixed shaft wheel train reducer for the primary reducer allows the motor to be eccentrically arranged, thereby increasing the ground clearance; the secondary NGW reducer is light in weight, compact in structure and high in transmission ratio, and the secondary reduction meets the requirements of high transmission ratio and high passability of off-road vehicles. The secondary reduction can use other types of planetary reducers.

[0017] The brake disc is connected with the wheel hub, the wheel hub bearing is arranged on the support sleeve, the support sleeve is directly fixedly connected with the shell, the support wheel hub is built-in to avoid cantilever structure of the transmission structure, and reasonable transmission and distribution of wheel hub power, brake force and ground force acting on the rim can be realized.

[0018] Preferably, the input gear shaft is located in the middle shell and is fixedly connected with the motor output shaft, preferably by spline connection.

[0019] Preferably, the primary reducer and the secondary reducer are connected by a low-speed spline shaft, and the low-speed spline shaft is located inside the support sleeve. Specifically, the primary reduction gear and the secondary NGW reduction sun gear are respectively provided with internal splines, and the two are connected and matched by the low-speed spline shaft, so that the secondary NGW reduction sun gear is floating, and can automatically center and find the best balance position when the load is uneven.

[0020] Preferably, the secondary NGW reducer comprises a secondary NGW reducer planetary carrier, a secondary NGW reduction sun gear, a secondary NGW reducer ring gear and a secondary NGW reducer planetary wheel, the secondary NGW reduction sun gear is engaged with the secondary NGW reducer planetary wheel, and the secondary NGW reducer planetary carrier is engaged with the secondary NGW reducer planetary wheel; the secondary NGW reducer ring gear is fixedly connected to the support sleeve, and the support sleeve is fixedly connected to the middle shell, so that power is input to the secondary NGW reduction sun gear through the low-speed spline shaft, and then output through the secondary NGW reducer planetary carrier. The secondary NGW reducer planetary carrier is connected with the wheel hub assembly and the rim, and is used for outputting torque and bearing.

[0021] Preferably, a ring gear connecting frame is arranged between the secondary NGW reducer ring gear and the support sleeve, the secondary NGW reducer ring gear and the ring gear connecting frame are fixedly connected by spline, a clamping groove along the circumference is arranged inside the end of the secondary NGW reducer ring gear facing the motor, and an elastic check ring is arranged in the clamping groove to axially position the ring gear connecting frame, the ring gear connecting frame is spline-connected with the support sleeve, and a lock nut is used to fix the ring gear connecting frame, so that the secondary NGW reducer ring gear and the wheel set shell are relatively static.

[0022] Preferably, the brake caliper is fixedly connected to the middle shell, and the brake disc is provided with a ventilation hole.

[0023] Preferably, threaded holes are arranged on the middle shell, and the middle shell is connected with the suspension structure by screwing. The suspension structure comprises an upper connecting frame and a lower connecting frame which are fixed to the upper and lower parts of the middle shell by screwing, the lower part of the upper connecting frame is vertically fixed to the middle shell, the upper part of the upper connecting frame is inclined at an angle of 8-10 degrees with respect to the lower part of the upper connecting frame, and the upper connecting frame is connected to the vehicle frame through an upper cross arm hinged to the upper part of the upper connecting frame; the lower connecting frame is perpendicular to the middle shell and is connected to the vehicle frame through a lower cross arm hinged to the lower connecting frame.

[0024] In the existing electric wheel set structure, the motor is completely located in the electric wheel, and the hub motor is mostly used, the integration degree is high, but the electric wheel set has a larger radial size, and has a high requirement on the space in the wheel rim; meanwhile, under the large radial size, the connection of the suspension and the electric wheel set is not easy to arrange, and the installation position of the lower suspension is related to the ground clearance of the vehicle. The electric wheel set mechanism provided by the application has the motor located outside the wheel rim, which reserves space for the arrangement of other structures in the wheel rim, is conducive to the arrangement of the suspension, improves the ground clearance, has good passability, and is suitable for off-road vehicles running on complex road surfaces such as sandstone mountain roads.

[0025] Compared with the ordinary reducer, the NGW reducer adopted in the application has larger bearing capacity, stable movement, and strong anti-impact and vibration capacity. In addition, under the same power and transmission conditions, the outer profile size and weight of the planetary reducer are only 1 / 2 to 1 / 6 of those of the ordinary gear transmission.

[0026] In addition, in the prior art, when the brake disc is located on one side of the reducer, additional space is required for the arrangement of the corresponding brake caliper, which greatly increases the overall axial distance from the tire center to the motor output, affects the installation distance of the suspension and the kingpin, and the structure provided by the application has the brake disc located on the support sleeve between the secondary reducer and the primary reducer, and the secondary reducer is arranged outside the wheel rim, which reduces the axial distance of the suspension installation to a certain extent, reduces the kingpin offset distance, prevents brake deviation, and improves the braking stability.

[0027] As a second aspect of the application, a vehicle comprising the integrated electric wheel set with the hub is provided.

[0028] Preferably, the vehicle is an electric off-road vehicle or an electric sport utility vehicle, which can meet the obstacle crossing demand of high passability of off-road vehicles.

[0029] Compared with the prior art, the application has the following advantages:

[0030] 1. The hub is built-in, the axial distribution of the power system, the transmission system and the braking system is reasonably arranged, the motor power, the hub brake braking force, the steering power, the wheel rim load bearing force of the whole vehicle, and the ground force on the wheel rim are reasonably transmitted and distributed, the overall structure is light and compact, the transmission is efficient, the brake is connected with the hub, the brake action time is short, and the service life is reduced.

[0031] 2. The hub is built-in, and the hub assembly is located at the middle segment position of the wheel set, so that the distance from the wheel rim center line to the hub bearing is shortened, the cantilever beam structure is avoided, the torque borne by the hub bearing is reduced, a good service environment is provided for the hub bearing, the overall equipment reliability is improved, and the bearing of large-tonnage load is facilitated.

[0032] 3, The application integrates a first fixed shaft wheel train reducer and a second NGW reducer, reduces and increases the power output by the motor, takes into account the highest speed of the wheel set while meeting the requirement of large climbing degree; the first fixed shaft wheel train is connected to the motor, the motor is eccentrically suspended and is higher than the hub center line, thereby increasing the vehicle motor ground clearance and improving the passability of the vehicle.

[0033] 4, The electric wheel set provided by the application has the brake disc located on the support sleeve between the second reducer and the first reducer, the second reducer is located outside the rim, and the suspension structure is installed on the middle shell of the wheel set, so that the axial distance of the suspension installation can be reduced, the kingpin offset distance can be reduced, the brake deviation can be prevented, and the brake stability is improved.

[0034] 5, The electric wheel set provided by the application cancels the steering knuckle, adopts upper and lower double wishbone structures, reduces the axial length of the electric wheel, increases the frame space, and facilitates the arrangement of other components; the starting ends of the two wishbones are close to the rim position, which avoids interference with the motor on the one hand and helps to increase the wishbone length on the other hand, so that the up-and-down bouncing amount of the wheel can be improved, and the obstacle crossing demand of the off-road vehicle for high passability can be better met. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings accompanying the specification of the application form a part of the application and serve to further understand the application, the illustrative embodiments of the application and the description thereof serve to explain the application and do not constitute an improper limitation of the application.

[0036] Figure 1 is a schematic diagram of the transmission relationship of the electric wheel set of the application;

[0037] Figure 2 is a schematic diagram of the transmission relationship of the electric wheel set of the application;

[0038] Figure 3 is an assembly explosion diagram of the electric wheel set of the application, Figure 3 is an inverted angle;

[0039] Figure 4 is an assembly cross-sectional view of the electric wheel set of the application;

[0040] Figure 5 is a structure diagram of the hub assembly of the electric wheel set of the application;

[0041] Figure 6 is a structure diagram of the gear ring connecting part of the electric wheel set of the application.

[0042] Among them, 1-motor, 2-input end housing, 3-input gear shaft, 4-middle section housing, 5-brake caliper, 6-brake disc, 7-hub assembly, 8-rim, 9-second-stage NGW reducer planetary carrier, 10-end cover, 11-second-stage NGW reducer planetary gear, 12-second-stage NGW reducer sun gear, 13-low-speed spline shaft, 14-locking nut, 15-second-stage NGW reducer gear ring, 16-gear ring connecting bracket, 17-support sleeve, 18-first-stage reduction gear, 19-motor output shaft, 20-suspension structure, 21-upper control arm, 22-lower control arm, 23-upper connecting bracket, 24-lower connecting bracket, 61-ventilation hole, 71-hub, 72-hub reinforcing rib, 73-hub bearing, 74-hub oil seal, 75-fastening sleeve, 151-elastic retaining ring, 152-slot. Detailed Implementation

[0043] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, 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 pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Example 1:

[0046] like Figures 1-4 As shown, the electric wheel set includes a motor 1, an input end housing 2, an input gear shaft 3, a middle section housing 4, a floating caliper disc brake, a hub assembly 7, a rim 8, a two-stage NGW reducer planetary carrier 9, an end cover 10, two-stage NGW reducer planetary gears 11, a two-stage NGW reducer sun gear 12, a low-speed spline shaft 13, a lock nut 14, a two-stage NGW reducer gear ring 15, a gear ring connecting bracket 16, a support sleeve 17, a first-stage reduction gear 18, and a motor output shaft 19. The motor 1 is located outside the rim 8 and installed inside the motor housing; the end cover 10, the middle section housing 4, and the input end housing 2 form the wheel set housing. The floating caliper disc brake includes a brake caliper 5 and a brake disc 6. The brake uses a commonly used disc brake; this embodiment uses a floating caliper disc brake, but those skilled in the art can also use a fixed caliper disc brake.

[0047] The input end housing 2 is connected with the motor housing at one end and connected with the middle section housing 4 at the other end. The middle section housing 4 is fixedly connected with the upper suspension interface 41, the lower suspension interface 42 and the suspension structure 20, and the other end of the middle section housing 4 is fixedly connected with the support sleeve 17 through a screw, and the other end of the support sleeve 17 is connected with the gear ring connecting frame 16, and the hub assembly 7 is sleeved on the periphery of the support sleeve 17.

[0048] A primary fixed shaft wheel system reducer is arranged in the middle section housing 4, which comprises an input gear shaft 3 and a primary reduction gear 18, the input gear shaft 3 is connected with the motor output shaft 19 through a spline, and is engaged with the primary reduction gear 18, so as to realize the transmission of power from the motor to the reducer.

[0049] The low-speed spline shaft 13 is connected with the primary reduction gear 18 and the secondary NGW reducer sun gear 12 through a spline structure respectively, the low-speed spline shaft 13 is located in the support sleeve 17, and the support sleeve 17 is fixed with the low-speed spline shaft 13 through a locking nut 14.

[0050] The secondary NGW reducer planetary carrier 9, the secondary NGW reducer sun gear 12, the secondary NGW reducer gear ring 15 and the secondary NGW reducer planetary gear 11 constitute the secondary NGW reducer, the secondary NGW reducer sun gear 12 is engaged with the secondary NGW reducer planetary gear 11, the secondary NGW reducer planetary carrier 9 is engaged with the secondary NGW reducer planetary gear 11, the secondary NGW reducer gear ring 15 is fixed in the support sleeve 17 through the gear ring connecting frame 16 and the locking nut, the support sleeve 17 is fixedly connected with the middle section housing 4, so as to realize the output of power through the secondary NGW reducer planetary carrier 9 after the input of power through the low-speed spline shaft 13 to the secondary NGW reducer sun gear 12. The secondary NGW reducer planetary carrier 9 is connected with the hub assembly 7 and the rim 8, and is used for outputting torque and bearing.

[0051] As Figure 5As shown, the wheel hub assembly 7 includes a wheel hub body 71, wheel hub reinforcing ribs 72, wheel hub bearings 73, wheel hub oil seals 74, and a fastening sleeve 75, located between the two-stage NGW reducer and the first-stage fixed-axis gear train reducer. The wheel hub reinforcing ribs 72 are evenly distributed on the surface of the wheel hub body 71, and each rib has threaded holes for bolt connection to the brake disc 6. The wheel hub bearings 73 are located inside the wheel hub body 71. The fastening sleeve 75 is located at the rightmost end of the wheel hub body 71 and is bolted to the wheel hub body 71. A wheel hub oil seal 74 is located between the wheel hub bearings 73 and the fastening sleeve 75. Two wheel hub bearings 73 are arranged between the support sleeve 17 and the wheel hub body 71, and the centerline of the wheel rim 8 is located between the two wheel hub bearings 72. A skeleton oil seal is provided between the wheel hub fastening sleeve 75 and the support sleeve 17, and between the input gear shaft 3 and the input end housing 2. This structure connects the brake to the wheel hub, thus shortening the brake application time. The wheel hub assembly is located in the middle of the wheel set, which shortens the distance from the wheel rim centerline to the wheel hub bearing, reduces the torque on the wheel hub bearing, and is beneficial for bearing large tonnage loads.

[0052] The input end housing 2 serves as both the input end cover for the first-stage reducer and the motor.

[0053] The present invention provides a floating caliper disc brake including a brake caliper 5 and a brake disc 6 for vehicle braking. The brake caliper 5 is fixed to the middle housing 4 by screws and cooperates with the brake disc 6 to achieve wheel hub braking.

[0054] The brake disc 6 is provided with ventilation holes 61 to increase the heat dissipation area and reduce heat fade efficiency.

[0055] like Figure 6 As shown, the gear ring connecting frame 16 is disposed between the gear ring 15 of the two-stage NGW reducer and the support sleeve 17. The gear ring 15 of the two-stage NGW reducer is splinedly connected to the gear ring connecting frame 16. The gear ring 15 of the two-stage NGW reducer has a circumferential groove 152 inside the end facing the motor. The elastic retaining ring 151 is installed in the groove 152 to axially position the gear ring connecting frame 16. The gear ring connecting frame 16 is splinedly connected to the support sleeve 17. The locking nut 14 is threadedly connected to the support sleeve 17 to fix the gear ring connecting frame 16, so that the gear ring 15 of the two-stage NGW reducer is relatively stationary with respect to the wheel set housing.

[0056] One end of the support sleeve 17 is fixedly connected to the middle section housing 4, and the other end is provided with a locking nut 14 through a thread to provide axial positioning for the gear ring 15 and hub bearing 73 of the two-stage NGW reducer.

[0057] Specifically, deep groove ball bearings are used between the motor output shaft 19 and the input end housing 2, between the input gear shaft 3 and the middle section housing, and between the first-stage reduction gear 18 and the middle section housing, and a tapered roller bearing is used for the wheel hub bearing 73 of the wheel hub assembly 7. This structure integrates a first-stage fixed shaft wheel train reducer and a second-stage NGW reducer, reliably reduces and increases the power of the motor output on the basis of a short output shaft length, takes into account the highest speed of the wheel set while meeting the requirement of large climbing degree, and can realize both 120km / h of off-road vehicle and 60% of climbing degree, which is a performance that general vehicles cannot simultaneously meet.

[0058] Specifically, in this embodiment, the motor 1 is a permanent magnet synchronous motor.

[0059] When the integrated electric wheel set is running, the output shaft of the motor 1 rotates, is connected with the input gear shaft 3 through the inner spline, and the power is transmitted from the input gear shaft 3 to the first-stage reduction gear 18, which drives the low-speed spline shaft 13 to rotate, and further drives the second-stage NGW reduction sun gear 12 to output the power from the second-stage NGW reducer planetary carrier 9, which drives the wheel hub assembly 7 and the rim 8 to rotate under the connection of the bolts, the wheel set rotates, and finally the power transmission is completed.

[0060] When the wheel set brakes, the hydraulic oil circuit of the brake caliper 5 establishes pressure, pushes the friction plate into contact with the brake disc 6, further prevents the rotation of the brake disc 6, the brake disc 6 drives the wheel hub assembly 7 to stop moving, and further, the wheel hub assembly 7 drives the rim 8 and the wheel to stop rotating.

[0061] When the wheel set brakes, the hydraulic oil circuit of the brake caliper 5 establishes pressure, pushes the friction plate into contact with the brake disc 6, further prevents the rotation of the brake disc 6, the brake disc 6 drives the wheel hub assembly 7 to stop moving, and further, the wheel hub assembly 7 drives the rim 8 and the wheel to stop rotating.

[0062] Embodiment 2: a vehicle comprising the electric wheel set

[0063] The vehicle can be an electric off-road vehicle or an electric sport utility vehicle, such as Figure 1 and Figure 4As shown, the electric wheel set described in embodiment 1 is included, wherein the middle section shell 4 of the electric wheel set is connected to the suspension structure 20 connected to the frame through the upper suspension interface 41 and the lower suspension interface 42, the upper suspension interface 41 and the lower suspension interface 42 are threaded holes, the suspension structure 20 includes an upper connecting frame 23 and a lower connecting frame 24 fixed to the upper side and the lower side of the middle section shell 4 by screwing, the lower part of the upper connecting frame is perpendicular to the middle section shell 4, the upper part of the upper connecting frame is inclined at an angle of 8-10 degrees with the lower part of the upper connecting frame, and the upper connecting frame 23 is connected to the frame through the upper arm 21 hinged to the upper part of the upper connecting frame; the lower connecting frame 24 is perpendicular to the middle section shell 4 and is connected to the frame through the lower arm 22 hinged to the lower connecting frame. This structure omits the steering knuckle and shortens the axial length of the electric wheel; on the basis of avoiding interference with the motor, the upper arm and the lower arm are also closer to the rim, the design length of the upper arm and the lower arm is prolonged, which is beneficial to improve the wheel jump height and improve the obstacle passing performance of the vehicle.

[0064] The integrated electric wheel with built-in hub provided by the application realizes eccentric setting of the motor by using a two-stage reduction structure, which improves the motor height and improves the passing performance of the off-road vehicle, and avoids interference between the motor and the swing arm.

[0065] The above only describes the preferred embodiments of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An integrated electric wheel set for use in an electric off-road vehicle or electric sport utility vehicle, characterized in that, The application relates to a wheel set, which comprises a two-stage speed reducer, a caliper brake, a motor, a wheel set shell, a support sleeve, a wheel hub assembly and a wheel rim, wherein the two-stage speed reducer comprises a primary speed reducer and a secondary speed reducer which are connected with each other; the caliper brake comprises a brake disc and a brake caliper; the wheel set shell comprises an end cover, a middle shell and an input end shell; the input end shell is connected with the motor shell at one end and connected with the middle shell at the other end; the motor is arranged outside the wheel rim and installed in the motor shell; the primary speed reducer is arranged in the middle shell and connected with the motor through an input gear shaft; the secondary speed reducer is arranged between the end cover and the wheel hub assembly; the wheel hub assembly is arranged between the secondary speed reducer and the primary speed reducer and fixedly connected with the wheel rim and the brake disc; one end of the support sleeve is fixedly connected with the middle shell and the other end penetrates through the wheel hub assembly; the wheel hub assembly comprises a wheel hub body, a wheel hub bearing and a fastening sleeve; the wheel hub bearing is arranged inside the wheel hub body and between the wheel hub body and the support sleeve; the fastening sleeve is fixedly connected with the rightmost end of the wheel hub body and a wheel hub oil seal is arranged between the wheel hub bearing and the fastening sleeve; the input gear shaft is arranged in the middle shell and fixedly connected with the motor output shaft; the brake caliper is fixedly connected with the middle shell; the middle shell is connected with a suspension structure; the suspension structure comprises an upper connecting frame arranged above the middle shell and a lower connecting frame arranged below the middle shell; the lower part of the upper connecting frame is fixedly connected with the middle shell vertically; the upper part of the upper connecting frame is inclined at an angle of 8-10 degrees with respect to the lower part of the upper connecting frame; the upper connecting frame is connected with a vehicle frame through an upper transverse arm hinged to the upper part of the upper connecting frame; the lower connecting frame is perpendicular to the middle shell and connected with the vehicle frame through a lower transverse arm hinged to the lower connecting frame; the secondary speed reducer is an NGW speed reducer; the secondary NGW speed reducer comprises a secondary NGW speed reducer planetary carrier, a secondary NGW speed reducer sun gear, a secondary NGW speed reducer gear ring and a secondary NGW speed reducer planet wheel; the secondary NGW speed reducer sun gear is engaged with the secondary NGW speed reducer planet wheel and the secondary NGW speed reducer planetary carrier is engaged with the secondary NGW speed reducer planet wheel; the secondary NGW speed reducer gear ring is fixedly connected with the support sleeve; the secondary NGW speed reducer planetary carrier is connected with the wheel hub assembly and the wheel rim; the secondary speed reducer is arranged outside the wheel rim; the wheel hub body is uniformly provided with a plurality of reinforcing ribs on the side facing the wheel hub bearing and the reinforcing ribs are fixedly connected with the brake disc; the brake disc is provided with ventilation holes; the primary speed reducer is a fixed shaft wheel train speed reducer; the primary speed reducer and the secondary speed reducer are connected through a low-speed spline shaft which is arranged inside the support sleeve; a gear ring connecting frame is arranged between the secondary NGW speed reducer gear ring and the support sleeve; the secondary NGW speed reducer gear ring is fixedly connected with the gear ring connecting frame through splines; a clamping groove is arranged along the circumference on the end of the secondary NGW speed reducer gear ring facing the motor; an elastic retainer is arranged in the clamping groove to axially position the gear ring connecting frame; the gear ring connecting frame is splined with the support sleeve; a lock nut is used to fix the gear ring connecting frame so that the secondary NGW speed reducer gear ring and the wheel set shell are relatively stationary. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The integrated electric wheel set built-in in a wheel hub for an electric off-road vehicle or an electric sport utility vehicle according to claim 1, characterized by, ​ 3. The integrated electric wheel set built-in in a wheel hub for an electric off-road vehicle or an electric sport utility vehicle according to claim 1, characterized by, ​ 4. The integrated electric wheel set built-in to the wheel hub for an electric off-road vehicle or an electric sport utility vehicle according to claim 1, characterized by, ​ 5. The integrated electric wheel set built-in in a wheel hub for an electric off-road vehicle or an electric sport utility vehicle according to claim 4, characterized by, ​ 6. The integrated electric wheel set for use in the hub of an electric off-road vehicle or electric sport utility vehicle according to claim 5, characterized in that, ​ 7. A vehicle characterized by comprising: An integrated electric wheel set for use in a hub of an electric off-road vehicle or electric sport utility vehicle, the vehicle being selected from the group consisting of an electric off-road vehicle or an electric sport utility vehicle, according to any one of claims 1 to 6. An integrated electric wheel set for use in a hub of an electric off-road vehicle or electric sport utility vehicle, the vehicle being selected from the group consisting of an electric off-road vehicle or an electric sport utility vehicle, according to any one of claims 1 to 6.

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