A wheel hub motor driven wheel

Abstract

The utility model relates to a kind of hub motor drive wheel, the inside of second hub is provided with first hub, the outside of hub formed by the combination of second hub and first hub is provided with tire, the inside of second hub is provided with speed reducer, the inside of first hub is provided with motor;Gear ring is respectively engaged with primary planetary gear and secondary planetary gear and is connected, primary planetary gear is engaged with primary sun gear and is connected, secondary planetary gear is engaged with secondary sun gear and is connected, the inner ring of primary planetary gear is rotatably connected with the rotating shaft of primary planet carrier, the inner ring of secondary planetary gear is rotatably connected with the rotating shaft of secondary planet carrier, the rotating shaft of primary sun gear is fixedly connected with motor as a whole, the inner ring of secondary sun gear is connected with the rotating shaft of primary sun gear, outer ring is fixedly connected with primary planet carrier as a whole.Compared with prior art, the utility model has large reduction ratio while compact structure, improve transmission efficiency and carrying capacity.

Description

Technical Field

[0001] This utility model belongs to the field of hub motor technology and relates to a hub motor drive wheel. Background Technology

[0002] With the development of embodied intelligence technology, omnidirectional chassis are used in a large number of wheeled humanoid robots. Traditional hub motors are prone to problems such as insufficient driving torque, excessive current, high power consumption, and surges when used under heavy loads. Some robot hub motor drive wheels also use planetary gear transmission, but most of them adopt traditional multi-stage planetary gear transmission structures, with relatively small reduction ratios, limited output torque, and relatively high overall actuator height.

[0003] Patent CN109398069A discloses an integrated external rotor electric wheel structure and assembly method, including a hub motor, a reduction mechanism, a brake, a vibration damping mechanism, a cooling mechanism, and a wheel rim. The reduction mechanism includes a primary and a secondary reduction mechanism. The hub motor rotor and the gear ring of the primary reduction mechanism are designed as an integrated structure, and the planetary carrier of the primary reduction mechanism and the sun gear of the secondary reduction mechanism are designed as an integrated structure. Power is input from the hub motor rotor, and output to the wheel through the gear ring of the primary reduction mechanism, the planetary carrier, the sun gear of the secondary reduction mechanism, and the planetary carrier, driving the vehicle to run. At the same time, the brake disc and the planetary carrier of the secondary reduction mechanism are designed as an integrated structure and rotate accordingly. The brake caliper is mounted on the housing. The cooling mechanism adopts a combination of splash cooling and oil channel cooling to achieve comprehensive cooling of the motor, reduction mechanism, and brake. However, in this patent, the output component of the first-stage planetary transmission is connected to the input component of the second-stage planetary transmission. The first-stage planetary transmission is a high-speed basic gear transmission, and the second-stage planetary transmission is a low-speed basic gear transmission. The double-stage planetary gear transmission is just two basic planetary transmissions connected in series, which has limited load-bearing capacity. Moreover, this patent requires cooling and is not suitable for use in humanoid robots.

[0004] Patent CN108340768A discloses an electric wheel assembly with an integrated hub motor. The electric wheel assembly includes a hub, a hub shaft, an inner rotor motor, a planetary gear reducer, a steering knuckle assembly, and a braking system. The hub shaft is connected to the hub, and the inner rotor motor is located inside the hub. The inner rotor motor includes a rotor sleeve fitted on the hub shaft. The input end of the planetary gear reducer is connected to the rotor sleeve, and the output end is connected to the hub. The steering knuckle assembly includes a steering knuckle sleeve fitted on the hub shaft, and the braking system is fitted on the rotor sleeve. The braking system brakes the electric wheel assembly by braking the rotor sleeve. A motor bearing is provided between the rotor sleeve and the motor housing, and a hub bearing is provided between the steering knuckle sleeve and the hub shaft. However, this patent has a relatively small reduction ratio, insufficient output torque, and the gearbox is prone to wear under heavy loads, resulting in a short lifespan. Utility Model Content

[0005] The purpose of this invention is to overcome at least one of the defects of the prior art and provide a hub motor driven wheel. This invention has a large reduction ratio and a more compact structure, improving transmission efficiency and load-bearing capacity.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] One of the technical solutions of this utility model is to provide a hub motor drive wheel, which includes a tire, a second hub, a first hub, a reducer, and a motor.

[0008] The second wheel hub has a first wheel hub located on the inner side of the drive wheel in the axial direction, and the wheel hub formed by the combination of the second wheel hub and the first wheel hub has a tire located on the outer side of the drive wheel in the radial direction.

[0009] The second hub has a speed reducer installed on the inner side of the drive wheel in the radial direction, and the first hub has a motor installed on the inner side of the drive wheel in the radial direction.

[0010] The speed reducer includes a speed reducer body, which includes a gear ring, a first-stage planetary gear, a second-stage planetary gear, a first-stage sun gear, a second-stage sun gear, a first-stage planetary carrier, and a second-stage planetary carrier.

[0011] The gear ring is meshed with and connected to the first-stage planetary gear and the second-stage planetary gear, respectively.

[0012] The first-stage planetary gear meshes with the first-stage sun gear, and the second-stage planetary gear meshes with the second-stage sun gear.

[0013] The inner ring of the first-stage planetary gear is rotatably connected to the shaft of the first-stage planetary carrier, and the inner ring of the second-stage planetary gear is rotatably connected to the shaft of the second-stage planetary carrier.

[0014] The shaft of the first-stage sun gear is fixedly connected to the motor as a whole. The inner ring of the second-stage sun gear is connected to the shaft of the first-stage sun gear, and the outer ring is fixedly connected to the first-stage planetary carrier as a whole.

[0015] As a preferred technical solution, the gear ring is connected to the second hub and the first hub by bolts to form a whole.

[0016] As a preferred technical solution, the secondary sun gear is welded to the primary planetary carrier to form a single unit.

[0017] Furthermore, the shaft of the first-stage planetary carrier is rotatably connected to the first-stage planetary gear via a first bearing. The inner ring of the first bearing is connected to the shaft of the first-stage planetary carrier, and the outer ring is connected to the first-stage planetary gear.

[0018] The rotating shaft of the secondary planetary carrier is rotatably connected to the secondary planetary gear through a second bearing. The inner ring of the second bearing is connected to the rotating shaft of the secondary planetary carrier, and the outer ring is connected to the secondary planetary gear.

[0019] Furthermore, the motor includes a motor body, which includes a motor stator, a motor rotor, a rotor rear cover, and a rotor front cover.

[0020] The motor stator has a motor rotor rotatably mounted on the inner side of the drive wheel in the radial direction. The motor rotor is located on the outer side of the drive wheel in the radial direction, with the rear cover and front cover on the outer side of the drive wheel in the axial direction.

[0021] The rotor front cover is rotatably connected to the secondary planetary carrier.

[0022] As a preferred technical solution, the rotor rear cover is fixedly connected to the rotor front cover by bolts.

[0023] Furthermore, the first-stage planetary gear is positioned axially outside the second-stage planetary gear on the drive wheel, and the first-stage sun gear is positioned axially outside the second-stage sun gear on the drive wheel.

[0024] The first-stage planetary carrier is located inside the first-stage planetary gear on the axial side of the drive wheel, and the second-stage planetary gear is located outside the axial side of the drive wheel. The second-stage planetary carrier is located inside the second-stage planetary gear on the axial side of the drive wheel, and the rotor front cover is located outside the axial side of the drive wheel.

[0025] Furthermore, the rotor front cover is rotatably connected to the secondary planetary carrier via a third bearing, wherein the inner ring of the third bearing is connected to the rotor front cover and the outer ring is connected to the secondary planetary carrier.

[0026] Furthermore, the reducer also includes a reducer housing cover, a reducer housing, and a reducer outer end cover.

[0027] The reducer housing has a reducer housing cover on the inner side of the drive wheel axial direction and a reducer outer end cover on the outer side.

[0028] The reducer body is housed within the reducer cavity formed by the reducer housing cover, the reducer housing, and the reducer outer end cover.

[0029] The gear ring is located on the inner side of the reducer housing in the radial direction of the drive wheel.

[0030] The reducer housing cover and reducer housing are located on the inner side of the second hub and the first hub in the radial direction of the drive wheel.

[0031] As a preferred technical solution, the gear ring and the outer end cover of the reducer are fixedly connected to the reducer housing by bolts, and the reducer housing is fixedly connected to the reducer housing cover by bolts.

[0032] As a preferred technical solution, the outer end cover of the reducer is provided with a sun gear dome, and the first-stage planetary gear is engaged with the sun gear dome.

[0033] Furthermore, the motor also includes a motor housing, a motor rear cover, and a motor tail cover.

[0034] The motor housing has a rear cover on the inner side of the drive wheel axial direction, and the rear cover has a tail cover on the inner side of the drive wheel axial direction.

[0035] The motor body is housed within the motor cavity formed by the motor housing, motor rear cover, and motor tail cover.

[0036] The motor stator, motor rotor, rotor rear cover, and rotor front cover are located on the inner side of the motor housing in the radial direction of the drive wheel, and the rotor rear cover is located on the inner side of the motor rear cover in the radial direction of the drive wheel.

[0037] The motor housing is located on the inner side of the reducer housing cover and the reducer housing radially inside the drive wheel.

[0038] As a preferred technical solution, the outer ring of the motor stator is connected to the motor housing, the inner ring is connected to the outer ring of the motor rotor, and the inner ring of the motor rotor is connected to the rotor rear cover.

[0039] Furthermore, the reducer is rotatably connected to the motor via a fourth bearing. The outer ring of the fourth bearing is connected to the reducer housing cover and the reducer housing, while the inner ring is connected to the secondary planetary carrier and the motor housing.

[0040] As a preferred technical solution, the motor housing is provided with an oil baffle ring on the radial outer side of the drive wheel. The motor housing is connected to the reducer housing cover through the oil baffle ring in a sealed fit to prevent the lubricating oil in the reducer and motor from overflowing out of the wheel hub.

[0041] As a preferred technical solution, the reducer body also includes a motor drive board and an encoder magnet. The encoder magnet is provided on the motor drive board, and the encoder magnet drives the rotor rear cover to rotate. The motor drive board is located on the inner side of the motor rear cover in the radial direction of the drive wheel.

[0042] As a preferred technical solution, the motor housing is fixedly connected to the motor rear cover by bolts, and the motor drive board and the motor tail cover are fixedly connected to the motor rear cover by bolts.

[0043] Furthermore, the rotor rear cover is rotatably connected to the motor rear cover via a fifth bearing, wherein the inner ring of the fifth bearing is connected to the rotor rear cover and the outer ring is connected to the motor rear cover.

[0044] Furthermore, a square hole is provided on the rotor front cover, and a square groove is provided on the shaft of the first-stage sun gear. The shaft of the first-stage sun gear extends into the square hole of the rotor front cover, and the square groove of the shaft is fixedly connected to the square hole as a whole. The first-stage sun gear is fixedly connected to the rotor front cover as a whole.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] (1) In this utility model, the gearbox is composed of a differential gear transmission and a simple quasi-planetary gear transmission. The input power of the first-stage sun gear is transmitted to the differential gear transmission and then the power can be split. On the one hand, the power is directly output to the gear ring through the first-stage planetary gear. At the same time, the differential gear transmission transmits part of the power to the second-stage planetary gear transmission through the gear ring, and the output power after its transformation is transmitted to the first-stage planetary carrier through the second-stage sun gear. The power is combined with the output power of the former and output to the gear ring. The power splitting closed planetary gear transmission design has a large reduction ratio and a more compact structure. The volume is smaller than that of the traditional double-stage planetary gear transmission structure. It has greater torque-increasing performance and a wide transmission ratio range. In particular, the power splitting design improves the transmission efficiency and load-bearing capacity of the gearbox, improves the durability and stability of the gearbox, extends the service life of the gearbox, has low power loss, and strong resistance to impact and vibration.

[0047] (2) In this utility model, the first-stage sun gear and the rotor front cover are connected by a square groove and a square hole to transmit torque. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the hub motor drive wheel in an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the assembly of the first-stage sun gear and the rotor front cover in an embodiment of this utility model.

[0050] Explanation of markings in the diagram:

[0051] 1—Tire, 2—Second hub, 3—Reducer housing cover, 4—Reducer housing, 5—Ring gear, 6—Reducer outer end cover, 7—First bearing, 8—First stage planetary gear, 9—First stage sun gear, 10—Sun gear dome, 11—Second stage sun gear, 12—First stage planetary carrier, 13—Second stage planetary carrier, 14—Second bearing, 15—Third bearing, 16—Second stage planetary gear, 17—Fourth bearing, 18—First hub, 19—Oil retainer ring;

[0052] 20—Motor housing, 21—Motor stator, 22—Motor tail cover, 23—Motor drive board, 24—Encoder magnet, 25—Rotor rear cover, 26—Fifth bearing, 27—Motor rotor, 28—Rotor front cover, 29—Motor rear cover. Detailed Implementation

[0053] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0054] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and are not intended to imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0055] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] Example:

[0057] A hub motor drives the wheel, such as Figure 1 As shown, the drive wheel includes a tire 1, a second hub 2, a first hub 18, a reducer, and a motor.

[0058] The second hub 2 has a first hub 18 disposed on the inner side of the drive wheel axial direction, and the hub formed by the combination of the second hub 2 and the first hub 18 has a tire 1 disposed on the outer side of the drive wheel radially.

[0059] The second hub 2 has a speed reducer installed on the inner side of the drive wheel in the radial direction, and the first hub 18 has a motor installed on the inner side of the drive wheel in the radial direction.

[0060] The speed reducer includes a speed reducer body, which includes a gear ring 5, a first-stage planetary gear 8, a second-stage planetary gear 16, a first-stage sun gear 9, a second-stage sun gear 11, a first-stage planetary carrier 12, and a second-stage planetary carrier 13.

[0061] The gear ring 5 meshes with the first-stage planetary gear 8 and the second-stage planetary gear 16, respectively.

[0062] The first-stage planetary gear 8 meshes with the first-stage sun gear 9, and the second-stage planetary gear 16 meshes with the second-stage sun gear 11.

[0063] The inner ring of the first-stage planetary gear 8 is rotatably connected to the shaft of the first-stage planetary carrier 12, and the inner ring of the second-stage planetary gear 16 is rotatably connected to the shaft of the second-stage planetary carrier 13.

[0064] The shaft of the first-stage sun gear 9 is fixedly connected to the motor as one unit. The inner ring of the second-stage sun gear 11 is connected to the shaft of the first-stage sun gear 9, and the outer ring is fixedly connected to the first-stage planetary carrier 12 as one unit.

[0065] The gear ring 5 is connected to the second hub 2 and the first hub 18 by bolts to form a single unit;

[0066] The second-stage sun gear 11 is welded to the first-stage planetary carrier 12 and fixedly connected as a whole;

[0067] The shaft of the first-stage planetary carrier 12 is rotatably connected to the first-stage planetary gear 8 via the first bearing 7. The inner ring of the first bearing 7 is connected to the shaft of the first-stage planetary carrier 12, and the outer ring is connected to the first-stage planetary gear 8.

[0068] The rotating shaft of the second-stage planetary carrier 13 is rotatably connected to the second-stage planetary gear 16 through the second bearing 14. The inner ring of the second bearing 14 is connected to the rotating shaft of the second-stage planetary carrier 13, and the outer ring is connected to the second-stage planetary gear 16.

[0069] The motor includes a motor body, which includes a motor stator 21, a motor rotor 27, a rotor rear cover 25, and a rotor front cover 28.

[0070] The motor stator 21 is rotatably mounted on the inner side of the drive wheel in the radial direction. The motor rotor 27 is mounted on the outer side of the drive wheel in the radial direction of the rotor rear cover 25 and the rotor front cover 28 is mounted on the outer side of the drive wheel in the axial direction of the drive wheel.

[0071] The rotor front cover 28 is rotatably connected to the secondary planetary carrier 13.

[0072] The rotor rear cover 25 is fixedly connected to the rotor front cover 28 by bolts to form a whole;

[0073] The first-stage planetary gear 8 is positioned on the outer side of the second-stage planetary gear 16 along the drive wheel axis, and the first-stage sun gear 9 is positioned on the outer side of the second-stage sun gear 11 along the drive wheel axis.

[0074] The first-stage planetary carrier 12 is located inside the first-stage planetary gear 8 on the drive wheel axis, and the second-stage planetary gear 16 is located outside the drive wheel axis. The second-stage planetary carrier 13 is located inside the second-stage planetary gear 16 on the drive wheel axis, and the rotor front cover 28 is located outside the drive wheel axis.

[0075] The rotor front cover 28 is rotatably connected to the secondary planetary carrier 13 via the third bearing 15. The inner ring of the third bearing 15 is connected to the rotor front cover 28, and the outer ring is connected to the secondary planetary carrier 13.

[0076] The speed reducer also includes a speed reducer housing cover 3, a speed reducer housing 4, and a speed reducer outer end cover 6.

[0077] The reducer housing 4 has a reducer housing cover 3 on the inner side of the drive wheel axis and a reducer outer end cover 6 on the outer side.

[0078] The reducer body is housed within the reducer cavity formed by the reducer housing cover 3, the reducer housing 4, and the reducer outer end cover 6.

[0079] The gear ring 5 is located on the inner side of the reducer housing 4 in the radial direction of the drive wheel.

[0080] The reducer housing cover 3 and the reducer housing 4 are disposed on the inner side of the second hub 2 and the first hub 18 in the radial direction of the drive wheel;

[0081] The gear ring 5 and the reducer outer end cover 6 are fixedly connected to the reducer housing 4 by bolts, and the reducer housing 4 is fixedly connected to the reducer housing cover 3 by bolts.

[0082] The outer end cover 6 of the reducer is provided with a sun gear dome 10, and the first-stage planetary gear 8 is engaged with the sun gear dome 10;

[0083] The motor also includes a motor housing 20, a motor rear cover 29, and a motor tail cover 22.

[0084] The motor housing 20 has a motor rear cover 29 on the inner side of the drive wheel axial direction, and the motor rear cover 29 has a motor tail cover 22 on the inner side of the drive wheel axial direction.

[0085] The motor body is housed within the motor cavity formed by the motor housing 20, the motor rear cover 29, and the motor tail cover 22.

[0086] The motor stator 21, motor rotor 27, rotor rear cover 25, and rotor front cover 28 are disposed on the inner side of the motor housing 20 in the radial direction of the drive wheel, and the rotor rear cover 25 is disposed on the inner side of the motor rear cover 29 in the radial direction of the drive wheel.

[0087] The motor housing 20 is located on the inner side of the reducer housing cover 3 and the reducer housing 4 in the radial direction of the drive wheel;

[0088] The outer ring of the motor stator 21 is connected to the motor housing 20, and the inner ring is connected to the outer ring of the motor rotor 27. The inner ring of the motor rotor 27 is connected to the rotor rear cover 25.

[0089] The reducer is connected to the motor via the fourth bearing 17. The outer ring of the fourth bearing 17 is connected to the reducer housing cover 3 and the reducer housing 4, and the inner ring is connected to the secondary planetary carrier 13 and the motor housing 20.

[0090] An oil baffle ring 19 is provided on the outer radial side of the drive wheel of the motor housing 20. The motor housing 20 is sealed and connected to the reducer housing cover 3 through the oil baffle ring 19 to prevent the lubricating oil in the reducer and motor from overflowing out of the wheel hub.

[0091] The reducer body also includes a motor drive plate 23 and an encoder magnet 24. The encoder magnet 24 is provided on the motor drive plate 23. The encoder magnet 24 drives the rotor rear cover 25 to rotate. The motor drive plate 23 is located on the inner side of the motor rear cover 29 in the radial direction of the drive wheel.

[0092] The motor housing 20 is fixedly connected to the motor rear cover 29 by bolts, and the motor drive plate 23 and the motor tail cover 22 are fixedly connected to the motor rear cover 29 by bolts.

[0093] The rotor rear cover 25 is rotatably connected to the motor rear cover 29 via the fifth bearing 26. The inner ring of the fifth bearing 26 is connected to the rotor rear cover 25, and the outer ring is connected to the motor rear cover 29.

[0094] like Figure 2 As shown, a square hole is provided on the rotor front cover 28, and a square groove is provided on the shaft of the first-stage sun gear 9. The shaft of the first-stage sun gear 9 extends into the square hole of the rotor front cover 28. The square groove of the shaft and the square hole are fixedly connected as one unit. The first-stage sun gear 9 and the rotor front cover 28 are fixedly connected as one unit.

[0095] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A hub motor driven wheel, characterized in that, The drive wheel includes a tire (1), a second hub (2), a first hub (18), a reducer, and a motor. The second hub (2) has a first hub (18) on the inner side of the drive wheel axial direction, and the hub formed by the combination of the second hub (2) and the first hub (18) has a tire (1) on the outer side of the drive wheel radial direction. The second hub (2) is provided with a speed reducer on the inner side of the drive wheel in the radial direction, and the first hub (18) is provided with a motor on the inner side of the drive wheel in the radial direction; The speed reducer includes a speed reducer body, which includes a gear ring (5), a first-stage planetary gear (8), a second-stage planetary gear (16), a first-stage sun gear (9), a second-stage sun gear (11), a first-stage planetary carrier (12), and a second-stage planetary carrier (13). The gear ring (5) is meshed with the first-stage planetary gear (8) and the second-stage planetary gear (16) respectively. The first-stage planetary gear (8) meshes with the first-stage sun gear (9), and the second-stage planetary gear (16) meshes with the second-stage sun gear (11). The inner ring of the first-stage planetary gear (8) is rotatably connected to the shaft of the first-stage planetary carrier (12), and the inner ring of the second-stage planetary gear (16) is rotatably connected to the shaft of the second-stage planetary carrier (13). The shaft of the first-stage sun gear (9) is fixedly connected to the motor, the inner ring of the second-stage sun gear (11) is connected to the shaft of the first-stage sun gear (9), and the outer ring is fixedly connected to the first-stage planetary carrier (12).

2. The hub motor drive wheel according to claim 1, characterized in that, The rotating shaft of the first-stage planetary carrier (12) is rotatably connected to the first-stage planetary gear (8) via a first bearing (7). The inner ring of the first bearing (7) is connected to the rotating shaft of the first-stage planetary carrier (12), and the outer ring is connected to the first-stage planetary gear (8). The rotating shaft of the secondary planetary carrier (13) is rotatably connected to the secondary planetary gear (16) through the second bearing (14). The inner ring of the second bearing (14) is connected to the rotating shaft of the secondary planetary carrier (13), and the outer ring is connected to the secondary planetary gear (16).

3. A hub motor drive wheel according to claim 1, characterized in that, The motor includes a motor body, which includes a motor stator (21), a motor rotor (27), a rotor rear cover (25), and a rotor front cover (28). The motor stator (21) has a motor rotor (27) rotatably mounted on the inner side of the drive wheel in the radial direction. The motor rotor (27) is mounted on the rear cover (25) and the front cover (28) is mounted on the outer side of the drive wheel in the radial direction. The rear cover (25) has the front cover (28) mounted on the outer side of the drive wheel in the axial direction. The rotor front cover (28) is rotatably connected to the secondary planetary carrier (13).

4. A hub motor drive wheel according to claim 3, characterized in that, The first-stage planetary gear (8) is positioned on the outer side of the second-stage planetary gear (16) along the drive wheel axial direction, and the first-stage sun gear (9) is positioned on the outer side of the second-stage sun gear (11) along the drive wheel axial direction. The first-stage planetary carrier (12) is located inside the first-stage planetary gear (8) on the drive wheel axis, and the second-stage planetary gear (16) is located outside the drive wheel axis. The second-stage planetary carrier (13) is located inside the second-stage planetary gear (16) on the drive wheel axis, and the rotor front cover (28) is located outside the drive wheel axis.

5. A hub motor drive wheel according to claim 3, characterized in that, The rotor front cover (28) is rotatably connected to the secondary planetary carrier (13) via a third bearing (15). The inner ring of the third bearing (15) is connected to the rotor front cover (28), and the outer ring is connected to the secondary planetary carrier (13).

6. A hub motor drive wheel according to claim 3, characterized in that, The speed reducer also includes a speed reducer housing cover (3), a speed reducer housing (4), and a speed reducer outer end cover (6). The reducer housing (4) has a reducer housing cover (3) on the inner side of the drive wheel axial direction and a reducer outer end cover (6) on the outer side. The reducer body is housed within the reducer cavity formed by the reducer housing cover (3), the reducer housing (4), and the reducer outer end cover (6). The gear ring (5) is located on the inner side of the reducer housing (4) in the radial direction of the drive wheel. The reducer housing cover (3) and reducer housing (4) are located on the inner side of the second hub (2) and the first hub (18) in the radial direction of the drive wheel.

7. A hub motor drive wheel according to claim 6, characterized in that, The motor also includes a motor housing (20), a motor rear cover (29), and a motor tail cover (22). The motor housing (20) has a motor rear cover (29) on the inner side of the drive wheel axial direction, and the motor rear cover (29) has a motor tail cover (22) on the inner side of the drive wheel axial direction. The motor body is housed within the motor cavity formed by the motor housing (20), the motor rear cover (29), and the motor tail cover (22). The motor stator (21), motor rotor (27), rotor rear cover (25), and rotor front cover (28) are disposed on the inner side of the motor housing (20) in the radial direction of the drive wheel, and the rotor rear cover (25) is disposed on the inner side of the motor rear cover (29) in the radial direction of the drive wheel. The motor housing (20) is located on the inner side of the reducer housing cover (3) and the reducer housing (4) in the radial direction of the drive wheel.

8. A hub motor drive wheel according to claim 7, characterized in that, The reducer is connected to the motor via a fourth bearing (17). The outer ring of the fourth bearing (17) is connected to the reducer housing cover (3) and the reducer housing (4), and the inner ring is connected to the secondary planetary carrier (13) and the motor housing (20).

9. A hub motor drive wheel according to claim 7, characterized in that, The rotor rear cover (25) is rotatably connected to the motor rear cover (29) via a fifth bearing (26). The inner ring of the fifth bearing (26) is connected to the rotor rear cover (25), and the outer ring is connected to the motor rear cover (29).

10. A hub motor drive wheel according to claim 3, characterized in that, The rotor front cover (28) has a square hole, and the shaft of the first-stage sun gear (9) has a square groove. The shaft of the first-stage sun gear (9) extends into the square hole of the rotor front cover (28). The square groove of the shaft and the square hole are fixedly connected as one unit. The first-stage sun gear (9) and the rotor front cover (28) are fixedly connected as one unit.

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