Electric wheel and vehicle

Abstract

The name of the present invention is an electric wheel and vehicle. It belongs to the field of electric drive technology for electric vehicles. It mainly solves the problems of large axial dimension occupied by the reducer, difficult arrangement of the hub brake and heavy weight in the current electric wheel. Its main features are: the parking brake is arranged in the inner hole space of the motor rotor; the steering knuckle is fixed on the inner end cover of the motor and the motor stator housing, and a first concave cavity is arranged in the middle of the outer end cover of the motor; one side of the hub bearing and the planetary reducer located in the inner hole space of the hub bearing extends into the first concave cavity; the service brake is located in the space surrounded by the hub bearing, the outer end cover of the motor, the hub and the rim; the rim is connected to the planetary gear bracket of the planetary reducer; the rotor support spline shaft of the hub motor is connected to the input sun gear of the planetary reducer through a spline shaft. The present invention has the characteristics of compact structure and light weight, and is mainly suitable for various types of electric drive vehicles.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive of electric vehicles, and in particular relates to an electric wheel and a vehicle with the electric wheel. Background Art

[0002] The motor-driven wheel technology is the abbreviation of the motor-driven wheel technology. The motor used in the electric wheel is also called the hub motor. Its biggest feature is that the hub bearing device, power device, transmission device and brake device are all integrated into the hub, which greatly simplifies the transmission mechanical part between the motor and the hub of the electric vehicle. Compared with other drive forms, it has many advantages such as short transmission chain, high transmission efficiency and flexible layout. Electric vehicles using the electric wheel technology have obvious advantages in vehicle overall layout, energy saving, lightweight and generalization.

[0003] Electric vehicles, especially large-tonnage electric drive vehicles, have obvious advantages in adopting wheel hub motor solutions. The multi-stage planetary reduction technology solution adopted in the prior art has a large axial dimension of the reducer and is difficult to arrange the wheel hub brake. The brake is arranged from the motor shaft end, which requires a high brake speed, resulting in a reduced life; the single-stage planetary reduction technology solution has a smaller reduction ratio than the double-stage planetary reducer, and the motor output torque requirement is relatively large, and the volume is also relatively large; in addition, the prior art solutions rarely effectively integrate the inflation and deflation device, which is one of the actuators that must be configured for the vehicle to automatically inflate and deflate the tire. The prior art solutions rarely integrate the ABS ring gear and ABS sensor, which is also one of the data acquisition components that must be configured for the vehicle to achieve active safety. Patent CN103328247A proposes a wheel hub motor drive device, but does not specify the reduction mechanism used and the axial size and volume of the device are relatively large. Patent CN 108128143 A proposes an electric wheel and vehicle, which adopts a single-stage planetary reducer with a relatively small speed ratio and a relatively large motor size. It does not integrate a charging and discharging device, an ABS ring gear and an ABS sensor, and the integration level of the wheel hub bearing is not high. The double-stage reduction scheme of patents CN109823163A and CN108340768A occupies a larger axial space than the single-stage reduction scheme, and does not integrate a charging and discharging device, an ABS ring gear and an ABS sensor. The integration level of the wheel hub bearing is not high and the functions are relatively few. Summary of the invention

[0004] In order to overcome the shortcomings of the aforementioned prior art and solutions, the present invention provides an integrated inner rotor hub motor electric wheel solution with an inflation and deflation device, a two-stage planetary reducer, a hub bearing assembly, a service brake, a parking brake, a steering knuckle, a rim, an ABS ring gear and an ABS sensor.

[0005] The technical solution of the electric wheel of the present invention is: an electric wheel, comprising a wheel hub motor, a wheel hub bearing, a service brake, a parking brake, a steering knuckle, a wheel hub, a wheel rim and a planetary reducer, characterized in that: the parking brake is arranged in the inner hole space of the motor rotor of the wheel hub motor; the outer motor end cover and the inner motor end cover of the wheel hub motor are fixed on the motor stator housing, the steering knuckle is fixed on the inner motor end cover and the motor stator housing, and a first inner concave cavity extending into the inner hole space of the motor rotor is provided in the middle of the outer motor end cover; one side of the wheel hub bearing and the planetary reducer located in the inner hole space of the wheel hub bearing (15) extends into the first inner concave cavity of the outer motor end cover; the service brake is located in the space surrounded by the wheel hub bearing, the outer motor end cover, the wheel hub and the wheel rim; the wheel rim is connected to the planetary gear bracket of the planetary reducer; the rotor support spline shaft of the wheel hub motor is connected to the input sun gear of the planetary reducer through a spline shaft.

[0006] The planetary reducer described in the technical solution of the electric wheel of the present invention is a two-stage planetary reducer; the first-stage planetary reducer of the two-stage planetary reducer is located in the inner hole space of the hub bearing, and the second-stage planetary reducer is located outside the hub bearing; the first-stage ring gear of the first-stage planetary reducer and the second-stage ring gear of the second-stage planetary reducer form an integral ring gear through a stepped half-axle sleeve, and the ring gear is connected to the outer end cover of the motor; the first-stage planetary gear bracket of the first-stage planetary reducer is an integral structure, and the inner side is supported on the inner end cover of the motor through the inner hole of the second bearing, and the outer side is supported in the ring gear hole through the outer ring of the first bearing; the secondary planetary gear bracket of the second-stage planetary reducer is connected to the rim.

[0007] The technical solution for the electric wheel of the present invention provides a second concave cavity in the middle of the inner end cover of the motor extending into the inner hole space of the motor rotor, and a rotary transformer is arranged in the second concave cavity.

[0008] The technical solution of the electric wheel of the present invention also includes an inflation and deflation device; the inflation and deflation device includes an oil and gas seal, an inflation pipe, an air pipe and a wheel valve; the rotor support spline shaft and the spline shaft are hollow spline shafts, the inflation pipe passes through the hollow spline shaft, one end is fixed to the inner end cover of the motor, and the other end is connected to the wheel valve through the air pipe; the oil and gas seal is arranged between the inflation pipe and the planetary gear bracket.

[0009] The technical solution of the electric wheel of the present invention also includes an ABS ring gear and an ABS sensor; the ABS sensor is installed on the outer end cover of the motor, and the ABS ring gear is installed on the wheel hub bearing; the ABS sensor is aligned with the ABS ring gear, and the signal line passes through a through hole processed on the motor stator housing.

[0010] The wheel hub described in the technical solution of the electric wheel of the present invention is provided with a brake disc connecting flange, a rim connecting flange and an ABS gear ring, and is integrated with the wheel hub bearing into an independent and complete component; the inner ring of the wheel hub bearing presses the gear ring, and the wheel hub is rotatably supported on the gear ring; the secondary planetary gear bracket is fixedly connected to the rim connecting flange; the wheel hub bearing contains grease and has a self-sealing structure.

[0011] The parking brake described in the technical solution of the electric wheel of the present invention is a drum brake comprising a brake drum, a brake shoe, a return spring and a hydraulic cylinder; the parking brake is located in a space surrounded by a motor rotor, a motor rotor bracket, a rotor supporting spline shaft and an inner end cover of the motor; the brake drum is connected and fixed to the motor rotor bracket, and the brake shoe is fixed on the inner end cover of the motor.

[0012] The hub bearing described in the technical solution of the electric wheel of the present invention is composed of two bearings, and the center line of the rim is located between the two bearings.

[0013] The hub motor described in the technical solution of the electric wheel of the present invention also includes a motor rotor bracket, a motor rotor supporting spline shaft and a rotary transformer, the rotary transformer includes a rotary transformer rotor and a rotary transformer stator; the service brake includes a brake caliper and a brake disc, the brake caliper is fixedly connected to the outer end cover of the motor, and the brake disc is connected to the wheel hub.

[0014] The technical solution of the vehicle of the present invention is: a vehicle, including a vehicle, characterized in that: the vehicle includes any one of the electric wheels described above; an upper steering pin and a lower steering pin are provided on the steering knuckle of the electric wheel; the upper steering pin and the lower steering pin are connected to the suspension of the vehicle; the steering knuckle is provided with an interface connected to the steering system of the vehicle, and the steering system of the vehicle is connected to the interface.

[0015] The present invention adopts an electric wheel composed of a hub motor, a hub bearing, a service brake, a parking brake, a steering knuckle, a hub, a rim and a planetary reducer, wherein the parking brake is arranged in the inner hole space of the motor rotor of the hub motor, the outer end cover of the motor and the inner end cover of the hub motor are fixed on the housing of the motor stator, the steering knuckle is fixed on the inner end cover of the motor and the motor stator, a first concave cavity extending into the inner hole space of the motor rotor is arranged in the middle of the outer end cover of the motor, the hub bearing and one side of the planetary reducer located in the inner hole space of the hub bearing extend into the first concave cavity of the outer end cover of the motor, the service brake is located around the hub bearing, the outer end cover of the motor, the hub and the rim The wheel rim is connected to the planetary gear bracket of the planetary reducer, and the rotor support spline shaft of the wheel hub motor is connected to the input sun gear of the planetary reducer through the spline shaft, so that the wheel hub motor, wheel hub bearing, service brake, parking brake, steering knuckle, wheel hub, wheel rim and planetary reducer are not only formed into an integral electric wheel, but also the parking brake and part of the wheel hub bearing and the planetary reducer are arranged in the inner hole space of the motor rotor, and the service brake is arranged in the space surrounded by the wheel hub bearing, the motor outer end cover, the wheel hub and the wheel rim, so as to realize a reasonable arrangement in a limited space, reduce the axial size, and have a compact structure, reduce the weight of the electric wheel, and be suitable for various types of electric drive vehicles. Since the present invention can also be integrated with the inflation and deflation device, the ABS sensor and the ABS gear ring, it can realize the automatic inflation and deflation function of the tire and the ABS signal sensing function for the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the electric wheel of the present invention.

[0017] In the figure: 1. Upper steering pin; 2. Steering knuckle; 3. Motor inner end cover; 4. Motor stator; 5. Motor rotor; 6. Motor stator housing; 7. Motor outer end cover; 8. Brake caliper; 9. Brake disc; 10. ABS sensor; 11. ABS ring gear; 12. Wheel valve; 13. Wheel hub oil seal; 14. Ring gear; 15. Wheel hub bearing; 16. Secondary planetary gear bracket; 17. Secondary planetary gear; 18. Air pipe; 19. Oil and gas seal; 20. Secondary sun gear; 21. First planetary gear bracket; 22. First sun gear; 23. First bearing; 24. First planetary gear; 25. Brake disc connecting flange; 26. Wheel rim; 27. Lower steering pin; 28. Motor rotor bracket; 29. ​​Return spring; 30. Motor outer oil seal; 31. Oil seal inside the motor; 32. Input spline shaft; 33. Inflatable tube; 34. Oil seal; 35. Motor rotor supporting spline shaft; 36. Motor rotor supporting bearing; 37. Rotary transformer rotor; 38. Rotary transformer stator; 39. Hydraulic cylinder; 40. Brake shoe; 41. Brake drum; 42. Second bearing. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, in the embodiment of the present invention, the inner and outer directions refer to the side close to the center of the vehicle along the wheel axis as the inner side and the side away from the center of the vehicle as the outer side relative to the vehicle as a whole. The electric wheel is composed of an air charging and discharging device, a wheel hub motor, a wheel hub bearing 15, a service brake, a parking brake, a steering knuckle 2, a wheel hub, a wheel rim 26, a two-stage planetary reducer, an ABS sensor and an ABS ring gear.

[0020] The upper steering pin 1 and the lower steering pin 27 are connected to the steering knuckle 2, and can be connected to the vehicle suspension through the upper steering pin 1 and the lower steering pin 27. The steering knuckle 2 reserves an interface for connecting the steering system of the vehicle, and the steering system of the vehicle is connected to the interface.

[0021] The steering knuckle 2 is connected to the motor inner end cover 3 by bolts, the motor inner end cover 3 and the motor outer end cover 7 are connected to the motor stator housing 6 by bolts, the motor stator 4 is connected to the motor stator housing 6 by interference fit, the motor rotor 5 is supported by the motor rotor bracket 28, the motor rotor bracket 28 is connected to the motor rotor support spline shaft 35 by bolts, the motor rotor support spline shaft 35 is supported on the motor inner end cover 3 and the motor outer end cover 7 on both sides, the outer side of the outer motor rotor support bearing 36 is sealed by the motor outer oil seal 30 to prevent the lubricating oil in the reducer from flowing into the motor, and the inner side of the inner motor rotor support bearing 36 is sealed by the motor outer oil seal 30. The motor rotor support spline shaft 35 is connected to the secondary sun gear 20 through a spline shaft.

[0022] The two-stage planetary reducer includes a first-stage planetary reducer and a second-stage planetary reducer. The service brake includes a brake caliper 8 and a brake disc 9, which are located in a space surrounded by a wheel hub bearing 15, an outer end cover 7 of the motor, a wheel hub and a wheel rim 26. The first-stage ring gear of the first-stage planetary reducer and the second-stage ring gear of the second-stage planetary reducer form an integral ring gear 14 through a stepped half-axle sleeve. The ring gear 14 is fixed to the outer end cover 7 of the motor by bolts. The step of the ring gear 14 axially presses the inner ring of the wheel hub bearing 15 on the end face of the outer end cover 7 of the motor. The outer flange of the wheel hub bearing 15 is connected to the secondary planetary gear bracket 16 by bolts. The brake disc connecting flange 25 of the wheel hub bearing 15 is connected to the brake disc 9 by bolts. The brake caliper 8 is fixed to the outer end cover 7 of the motor by bolts. The wheel hub bearing 15 is integrated with the ABS ring gear 11, and the position corresponds to the position of the ABS sensor 10 fixed to the outer end cover 7 of the motor. The signal line passes through the through hole processed on the motor stator housing 6.

[0023] The second-stage gear ring 14 is larger than the first-stage gear ring. This part is connected to the outer end cover of the motor and also serves to fix the hub bearing assembly. The first-stage planetary reducer and the second-stage planetary reducer of the two-stage planetary reducer have a large speed ratio, which realizes the torque increase of the motor power through large speed ratio deceleration. The first-stage reducer and the hub bearing are in the same axial space, which realizes the reuse of axial space, making the actual axial space occupied by the two-stage reducer the same as that of the single-stage reducer, reducing the volume and weight of the electric wheel. The integral gear ring 14 further saves space. This part also has a load-bearing function. Due to the increase in radial size, the load-bearing capacity is greatly improved.

[0024] A first concave cavity is provided in the middle of the motor outer end cover 7 and extends into the inner hole space of the motor rotor 5 . The hub bearing 15 and one side of the first planetary reducer located in the inner hole space of the hub bearing 15 extend into the first concave cavity of the motor outer end cover 7 .

[0025] The first-stage planetary gear support 21 is an integral structure, the inner side is supported on the inner end cover 3 of the motor through the inner hole of the second bearing 42, and the outer side is supported on the inner hole of the ring gear 14 through the outer ring of the first bearing 23. The first-stage planetary gear 24 is connected to the first-stage planetary gear support 21 through a pin shaft and a bearing. The first-stage planetary reducer includes a first-stage sun gear 22, a first-stage planetary gear 24, a first-stage ring gear part of the ring gear 14 and a first-stage planetary gear support 21, which are located within the axial space inner hole of the hub bearing 15. The second-stage planetary reducer is located outside the hub bearing 15, and the second-stage planetary gear 17 is connected to the second-stage planetary gear support 16 through a pin shaft and a bearing, and the second-stage planetary gear support 16 is connected to the rim 26.

[0026] The wheel hub bearing consists of two bearings, and the center line of the rim is located between the two bearings.

[0027] The outer circle of the hub oil seal 13 is fixed to the inner hole of the secondary planetary gear bracket 16 by interference fit, and the lip of the hub oil seal 13 is in contact with the outer circle surface of the gear ring 14 and can rotate relatively.

[0028] The parking brake is a drum brake including a brake drum 41, a brake shoe 40, a return spring 29 and a hydraulic cylinder 39. The parking brake is located in a space surrounded by the motor rotor 5, the motor rotor bracket 28, the rotor support spline shaft and the motor inner end cover 3. The brake shoe 40 is composed of two brake shoes, one side of which is supported on a fulcrum fixed on the motor inner end cover 3 and can rotate around the fulcrum, and the other side of the brake shoe 40 is tightened by the return spring 29. One end of the hydraulic cylinder 39 is fixed on the motor inner end cover 3, and the other end is fixed on the side of the brake shoe 40 tightened by the return spring 29. The brake drum 41 is connected to the motor rotor bracket 28 by bolts.

[0029] The inflation and deflation device includes an oil and gas seal 19, an inflation tube 33, an air tube 18 and a wheel valve 12. The rotor support spline shaft and the spline shaft are hollow spline shafts, and the inflation tube 33 passes through the hollow spline shaft, one end of which is fixed on the inner end cover 3 of the motor, and the other end is connected to the wheel valve 12 through the air tube 18. The lip of the oil seal 34 cooperates with the inflation tube 33 to seal the lubricating oil in the reducer from leaking. The outer circle of the oil and gas seal 19 is fixed on the secondary planetary gear bracket 16 by interference fit, and the lip of the oil and gas seal 19 cooperates with the outer circle of the inflation tube 33, and its outer lip is used to seal the rotating transformer stator 38 fixed on the inner end cover of the motor, and the rotating transformer rotor 37 is connected to the motor rotor support spline shaft 35 by a key. The inner lip of the oil-gas seal 19 is used to seal the lubricating oil in the reducer to prevent leakage. One end of the air pipe 18 is fixed on the secondary planetary gear bracket 16, and the other end is fixed on the wheel valve 12. The air outlet of the wheel valve 12 is connected to the valve mouth of the tire.

[0030] The rotary transformer includes a rotary transformer rotor 37 and a rotary transformer stator 38. A second concave cavity extending into the inner hole space of the motor rotor 5 is provided in the middle of the motor inner end cover 3, and the rotary transformer is arranged in the second concave cavity. The rotary transformer stator 38 is fixed on the motor inner end cover 3, and the rotary transformer rotor 37 is connected to the motor rotor support spline shaft 35 through a key.

[0031] The hub bearing 15 is fixedly connected to the secondary planetary gear support 16 and the rim 26 .

[0032] The wheel hub is provided with a brake disc connection flange, a rim connection flange and an ABS gear ring, which are integrated with the wheel hub bearing 15 into an independent and complete component. The inner ring of the wheel hub bearing 15 presses the gear ring 14, and the wheel hub is rotatably supported on the gear ring 14. The secondary planetary gear bracket 16 is fixedly connected to the rim connection flange. The use of this integrated independent and complete component solves the problem of small space for the service brake caused by radial superposition of the half-axle sleeve, the wheel hub bearing and the wheel hub in the same axial dimension space, increases the radial contact area of ​​the brake disc, and improves the service brake life.

[0033] More optimally, the steering knuckle 2 and the motor inner end cover 3 can be integrated into one part.

[0034] More optimally, the motor rotor support bearing 36 is a self-lubricating and self-sealing bearing, which contains grease and has a self-sealing structure. The implementation scheme can remove the oil seal 31 inside the motor.

[0035] The invention solves the problem of interface matching and torque speed characteristic matching between the high-speed hub motor, the low-speed wheel rim and the hub brake.

[0036] The electric wheel drive power transmission path is as follows:

[0037] The primary input spline shaft 32 is connected to the internal spline of the motor rotor support spline shaft 35 through the external spline, and the torque of the motor rotor is transmitted to the primary sun gear 22 through the spline. The power of the primary sun gear 22 is decelerated by the primary planetary reducer (composed of the primary sun gear 22, the primary planetary gear 24, the ring gear 14 and the primary planetary gear bracket 21), and then the primary planetary gear bracket 21 transmits the power to the external spline of the secondary sun gear 20 through the internal spline. The power of the secondary sun gear 20 is decelerated by the secondary planetary reducer (composed of the secondary sun gear 20, the secondary planetary gear 17, the ring gear 14 and the secondary planetary gear bracket 16), and finally the secondary planetary gear bracket 16 transmits the power to the rim 26, and the rim is connected to the tire to drive the vehicle.

[0038] The electric wheel braking force transmission path is as follows:

[0039] For electric vehicles, the service braking force is provided by the service brake as mechanical braking force and by the motor as electric braking force. The brake caliper 8 is controlled by the brake system to press the brake disc 9, and the braking force is transmitted to the rim 26 through the brake disc mounting flange 25; the electric braking force is transmitted to the motor rotor support spline shaft 35 through the motor rotor bracket 28, and the motor rotor support spline shaft 35 is transmitted to the input spline shaft 32. The input spline shaft 32 amplifies the braking force through the two-stage planetary reducer and then transmits it to the secondary planetary gear bracket 16 and the rim 26.

[0040] The parking brake force is achieved by releasing the pressure of the hydraulic cylinder 39, causing the return spring 29 to rebound and press the brake shoe 40 against the brake drum 41, and the braking force is transmitted to the motor rotor bracket 28, the motor rotor bracket 28 transmits it to the motor rotor support spline shaft 35, the motor rotor support spline shaft 35 transmits it to the input spline shaft 32, and the input spline shaft 32 amplifies the braking force through the two-stage planetary reducer and transmits it to the secondary planetary gear bracket 16 and the rim 26.

[0041] The load-bearing capacity transmission path of the electric wheel is as follows:

[0042] The force applied to the suspension by the whole vehicle is transmitted to the steering knuckle 2 through the upper steering pin 1 and the lower steering pin 27 connected to the suspension swing arm. The steering knuckle 2 is fixed together with the inner end cover 3 of the motor, the stator housing 6 of the motor, the outer end cover 7 of the motor and the ring gear 14. The force is finally transmitted to the hub bearing 15 through the ring gear. The hub bearing 15 is fixedly connected with the rim 26 and finally transmitted to the tire mounted on the rim 26, thereby realizing the transmission of the bearing capacity of the electric wheel.

Claims

1. An electric wheel, comprising a hub motor, a hub bearing (15), a service brake, a parking brake, a steering knuckle (2), a hub, a rim (26) and a planetary reducer, characterized in that: The parking brake is arranged in the inner hole space of the motor rotor (5) of the wheel hub motor; the motor outer end cover (7) and the motor inner end cover (3) of the wheel hub motor are fixed on the motor stator housing (6), the steering knuckle (2) is fixed on the motor inner end cover (3) and the motor stator housing (6), and a first inner concave cavity is provided in the middle of the motor outer end cover (7) and extends into the inner hole space of the motor rotor (5); the service brake is located in the space surrounded by the wheel hub bearing (15), the motor outer end cover (7), the wheel hub and the wheel rim (26). The wheel rim (26) is connected to the planetary gear support of the planetary reducer; the rotor support spline shaft of the wheel hub motor is connected to the input sun gear of the planetary reducer via a spline shaft; the planetary reducer is a two-stage planetary reducer; the first-stage planetary reducer of the two-stage planetary reducer is located in the inner hole space of the wheel hub bearing (15), and the second-stage planetary reducer is located outside the wheel hub bearing (15); the first-stage ring gear of the first-stage planetary reducer and the second-stage ring gear of the second-stage planetary reducer form an integral ring gear (14) through a stepped half-axle sleeve, and the ring gear (14) is connected to the outer end cover (7) of the motor; the first-stage planetary gear support (21) of the first-stage planetary reducer is an integral structure, the inner side is supported on the inner end cover (3) of the motor through the inner hole of the second bearing (42), and the outer side is supported in the hole of the ring gear (14) through the outer ring of the first bearing (23); the second-stage planetary gear support (16) of the second-stage planetary reducer is connected to the wheel rim (26); the wheel hub bearing (15) and the second-stage planetary gear support (16) located in the inner hole space of the wheel hub bearing (15) One side of the first planetary reducer extends into the first concave cavity of the motor outer end cover (7); the inner ring of the wheel hub bearing (15) presses the ring gear (14), and the wheel hub is rotatably supported on the ring gear (14); the parking brake is located in a space surrounded by the motor rotor (5), the motor rotor bracket (28), the rotor support spline shaft and the motor inner end cover (3); a second concave cavity is provided in the middle of the motor inner end cover (3) and extends into the inner hole space of the motor rotor (5), and a rotary transformer is provided in the second concave cavity.

2. The electric wheel according to claim 1, characterized in that: It also includes an air charging and discharging device; the air charging and discharging device includes an oil-gas seal (19), an air charging pipe (33), an air pipe (18) and a wheel valve (12); the rotor support spline shaft and the spline shaft are hollow spline shafts, the air charging pipe (33) passes through the hollow spline shaft, one end of the air charging pipe (33) is fixed to the inner end cover (3) of the motor, and the other end is connected to the wheel valve (12) through the air pipe (18); the oil-gas seal (19) is arranged between the air charging pipe (33) and the planetary gear bracket.

3. An electric wheel according to claim 1 or 2, characterized in that: It also includes an ABS gear ring (11) and an ABS sensor (10); the ABS sensor (10) is mounted on the motor outer end cover (7), and the ABS gear ring (11) is mounted on the wheel hub bearing (15); the ABS sensor (10) and the ABS gear ring (11) are aligned, and a signal line passes through a through hole processed on the motor stator housing (6).

4. The electric wheel according to claim 1 or 2, characterized in that: The wheel hub is provided with a brake disc connecting flange, a wheel rim connecting flange and an ABS gear ring, and is integrated with the wheel hub bearing (15) into an independent and complete component; the secondary planetary gear bracket (16) is fixedly connected to the wheel rim connecting flange; the wheel hub bearing (15) contains lubricating grease and has a self-sealing structure.

5. The electric wheel according to claim 1 or 2, characterized in that: The parking brake is a drum brake comprising a brake drum (41), a brake shoe (40), a return spring (29) and a hydraulic cylinder (39); the brake drum (41) is connected and fixed to the motor rotor bracket (28), and the brake shoe (40) is fixed to the inner end cover (3) of the motor; the brake shoe (40) is composed of two brake shoes, one side of the brake shoe (40) is supported on a fulcrum fixed to the inner end cover (3) of the motor and can rotate around the fulcrum, and the other side of the brake shoe (40) is tightened by the return spring (29); one end of the hydraulic cylinder (39) is fixed to the inner end cover (3) of the motor, and the other end is fixed to the side of the brake shoe (40) tightened by the return spring (29).

6. The electric wheel according to claim 1 or 2, characterized in that: The wheel hub bearing is composed of two bearings, and the center line of the wheel rim is located between the two bearings.

7. The electric wheel according to claim 1 or 2, characterized in that: The wheel hub motor further comprises a motor rotor support (28), a motor rotor supporting spline shaft and a rotary transformer, wherein the rotary transformer comprises a rotary transformer rotor (37) and a rotary transformer stator (38); the service brake comprises a brake caliper (8) and a brake disc (9), wherein the brake caliper (8) is fixedly connected to the motor outer end cover (7), and the brake disc (9) is connected to the wheel hub.

8. The electric wheel according to claim 1 or 2, characterized in that: The steering knuckle (2) reserves an interface for connecting to a steering system of the vehicle, and the steering system of the vehicle is connected to the interface.

9. The electric wheel according to claim 1 or 2, characterized in that: The second stage gear ring of the gear ring (14) is larger than the first stage gear ring. The gear ring (14) is connected to the motor outer end cover (7) and also serves to fix the wheel hub bearing assembly.

10. A vehicle using the electric wheel according to any one of claims 1 to 9, characterized in that: The steering knuckle (2) is provided with an upper steering pin (1) and a lower steering pin (27); the upper steering pin (1) and the lower steering pin (27) are connected to a suspension of a vehicle; the steering knuckle (2) is provided with an interface for connecting to a steering system of the vehicle, and the steering system of the vehicle is connected to the interface.

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