Hub driving assembly and driving wheel

Abstract

The utility model relates to a hub driving assembly and a driving wheel, the hub driving assembly comprises a motor and a speed reducer arranged at one end of the motor, the speed reducer comprises a connecting piece used for being fixedly connected with a hub, the outer circumference of the hub is coated with a rubber coating body, the connecting piece is of a hollow structure, and a planetary gear mechanism is arranged in the connecting piece; the motor is connected with the planetary gear mechanism, a first inner gear ring is integrally arranged on the inner wall of the connecting piece, the planetary gear mechanism comprises a first planetary gear located in the first inner gear ring, and the first planetary gear is meshed with the first inner gear ring and used for driving the connecting piece to rotate. The first inner gear ring and the connecting piece are of an integrated structure, the integration degree of the speed reducer can be improved, the overall size of the speed reducer is reduced, the integrated transmission efficiency is good, and power transmission is stable and reliable.

Description

Technical Field

[0001] This application relates to the technical field of hub drive, specifically to a hub drive assembly and drive wheel. Background Technology

[0002] The wheel hub is a supporting component on the wheel. In electric vehicles, the wheel hub can be directly driven by a motor mounted on it. Currently, a reducer can be installed between the motor and the wheel hub. The reducer contains a gear transmission mechanism. Power is input from the motor to the gear transmission mechanism in the reducer, and then the gear transmission mechanism outputs power to drive the wheel hub to rotate. However, due to the low integration of components in the reducer, the overall size of the reducer is increased. Utility Model Content

[0003] This application provides a hub drive assembly and a drive wheel, which can solve the problem of the large overall size of the reducer.

[0004] According to one aspect of this application, one embodiment provides a hub drive assembly, including: a motor, and a reducer disposed at one end of the motor. The reducer includes a connector for connecting and fixing to a hub. The outer circumference of the hub is covered with a rubber coating. The connector has a hollow structure and a planetary gear mechanism is disposed inside the connector. The motor is connected to the planetary gear mechanism. A first internal gear ring is integrally disposed on the inner wall of the connector. The planetary gear mechanism includes a first planetary gear located inside the first internal gear ring. The first planetary gear meshes with the first internal gear ring to drive the connector to rotate.

[0005] In one embodiment, the planetary gear mechanism includes a first planetary gear, a first planetary carrier, a first sun gear, and a second planetary gear, a second planetary carrier, a second sun gear, and a second internal gear ring. The second sun gear meshes with the second planetary gear. The second planetary gear is disposed on the second planetary carrier and meshes with the second internal gear ring. The second internal gear ring is fixed relative to the first planetary carrier. The first sun gear meshes with the first planetary gear and is disposed on the first planetary carrier. The shaft of the motor is connected to the second sun gear of the planetary gear mechanism. The first sun gear is fixed relative to the second planetary carrier and is used to drive the first sun gear to rotate through the second planetary carrier.

[0006] In one embodiment, the second internal gear ring is integrally disposed on the first planetary carrier, thereby forming a relative fixation between the second internal gear ring and the first planetary carrier.

[0007] In one embodiment, one end of the first planetary carrier is fixedly connected to the end cover of the motor, and the other end of the first planetary carrier is supported in the connector by a bearing. The first planetary carrier has a central hole, and the first sun gear, the second sun gear, the second planetary carrier, the second planet gear, and the second internal gear ring are all located in the central hole. The first sun gear is relatively fixedly disposed at one end of the second planetary carrier and meshes with the first planet gear on the first planetary carrier. The second planet gear is disposed at the other end of the second planetary carrier and meshes with the second sun gear.

[0008] In one embodiment, the first planetary carrier is supported in the connector by a bearing, the end of the connector away from the motor is inserted into the shaft hole of the hub, and the end of the connector near the motor is provided with a first flange for connecting and fixing to the hub.

[0009] In one embodiment, a second flange is provided at one end of the first planetary carrier, and the second flange is fixedly connected to the end cover of the motor, and the first planetary gear is provided at the other end of the first planetary carrier.

[0010] In one embodiment, the first planetary gear, the first sun gear, and the first internal gear ring are all helical gears; and / or, the second planetary gear, the second sun gear, and the second internal gear ring are all helical gears.

[0011] In one embodiment, an end cap is provided at one end of the motor, and a through hole for the shaft to extend out is provided in the middle of the end cap. The end cap is provided with a first mounting part and a second mounting part. The first mounting part is used to fix the driver, and the second mounting part is used for external mounting of the hub drive assembly.

[0012] In one embodiment, a support surface is provided on one side of the end cap, and a first mounting hole is provided on the support surface, the first mounting hole being the first mounting portion; and / or, extension portions are provided on opposite sides of the end cap, the extension portions extending radially along the rotating shaft and protruding from the side wall of the motor, and a second mounting hole is provided on the extension portions, the second mounting hole being the second mounting portion.

[0013] According to another aspect of this application, one embodiment provides a drive wheel, including a hub, a rubber coating, and a hub drive assembly as described above, wherein the connector is fixedly connected to the hub, and the rubber coating covers the outer circumference of the hub.

[0014] According to the hub drive assembly and drive wheel of the above embodiment, a first internal gear ring is integrally formed on the inner wall of the connector. During operation, the motor shaft drives the planetary gear mechanism to operate. Because the first planetary gear meshes with the first internal gear ring, the first planetary gear can drive the connector to rotate, thereby driving the hub, which is fixed to the connector, to rotate, thus realizing the rolling of the drive wheel. The first internal gear ring and the connector are an integral structure, which can improve the integration of the reducer, reduce the overall size of the reducer, and the integrated design also has good transmission efficiency and stable and reliable power transmission. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a hub drive assembly according to one embodiment;

[0016] Figure 2 This is a schematic diagram of the structure of a speed reducer according to one embodiment;

[0017] Figure 3 This is a schematic diagram of the structure of a second planetary carrier according to one embodiment;

[0018] Figure 4 This is a schematic diagram of the structure of a motor according to one embodiment;

[0019] Figure 5 This is a schematic diagram of the drive wheel in another embodiment;

[0020] Figure 6 A schematic diagram of the exploded structure of the drive wheel in another embodiment;

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Coated body; 2-Hub; 3-Baffle; 4-Connector; 401-First flange; 5-First internal gear ring; 6-First planetary gear; 7-First planetary carrier; 701-Second flange; 8-Second planetary gear; 9-End cap; 901-Support surface; 902-Extension; 903-First mounting part; 904-Second mounting part; 10-Driver; 11-Motor; 12-Second internal gear ring; 13-Second planetary carrier; 14-First sun gear. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0024] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0025] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0026] Please see Figures 1 to 4 This application provides a hub drive assembly, including a motor 11, a reducer, and other functional components as needed, which are described in detail below.

[0027] like Figure 1 , Figure 5 , Figure 6 As shown, in this embodiment, the reducer is located at one end of the motor 11. The reducer includes a connector 4 for connecting and fixing to the hub 2. The outer circumference of the hub 2 is covered with a rubber coating 1. The connector 4 has a hollow structure and a planetary gear mechanism is provided inside the connector 4. The motor 11 is connected to the planetary gear mechanism. A first internal gear ring 5 is integrally provided on the inner wall of the connector 4. The planetary gear mechanism includes a first planetary gear 6 located inside the first internal gear ring 5. The first planetary gear 6 meshes with the first internal gear ring 5 to drive the connector 4 to rotate.

[0028] It is understood that in this embodiment, the connecting member 4 is a power output component rotatably disposed relative to the motor 11. The reduction transmission component of the reducer is located in the hollow structure of the connecting member 4. That is, the connecting member 4 is not only a power output component, but also serves as a protective shell for the reducer. In this embodiment, the connecting member 4 can be, but is not limited to, a metal material. In some embodiments, to achieve rotational balance, the outer contour of the cross-section of the connecting member 4 can be set as a circle, and this cross-section is a section perpendicular to the central axis of rotation of the connecting member 4. The hollow structure in this embodiment can be, but is not limited to, a central shaft hole provided inside the connecting member 4. In some embodiments, the connecting member 4 can be an annular structure with an inner hole. In this embodiment, the inner wall of the connecting member 4 is integrally provided with a first internal gear ring 5, that is, the connecting member 4 and the first internal gear ring 5 are an integral structure, and there is no assembly relationship between the connecting member 4 and the first internal gear ring 5. This can reduce the number of parts of the reducer and simplify the assembly steps. When a central shaft hole is provided inside the connecting member 4, the first internal gear ring 5 can be arranged circumferentially around the hole wall of the central shaft hole. In some embodiments, the integral connector 4 and the first internal gear ring 5 can be formed by casting or by machining. In this embodiment, the first internal gear ring 5 has a plurality of teeth, which are evenly distributed circumferentially on the inner wall of the connector 4 to form the first internal gear ring 5.

[0029] In the hub drive assembly provided in this embodiment, a first internal gear ring 5 is integrally formed on the inner wall of the connector 4. During operation, the shaft of the motor 11 drives the planetary gear mechanism. Because the first planetary gear 6 meshes with the first internal gear ring 5, the first planetary gear 6 can drive the connector 4 to rotate, thereby driving the hub 2, which is fixed to the connector 4, to rotate, thus realizing the rolling of the drive wheel. The first internal gear ring 5 and the connector 4 are an integral structure, which can improve the integration of the reducer, reduce the overall size of the reducer, and the transmission efficiency is better and the power transmission is more stable and reliable.

[0030] In one embodiment, such as Figure 1 , Figure 2 , Figure 6As shown, the planetary gear mechanism can be a double-row planetary gear transmission mechanism, for example, it may include a first planetary gear 6, a first planetary carrier 7, a first sun gear 14, and a second planetary gear 8, a second planetary carrier 13, a second sun gear, and a second internal gear ring 12. The second sun gear (not shown in the figure) meshes with the second planetary gear 8, which is mounted on the second planetary carrier 13 and meshes with the second internal gear ring 12. The second internal gear ring 12 is relatively fixed to the first planetary carrier 7. The first sun gear 14 meshes with the first planetary gear 6, which is mounted on the first planetary carrier 7. The rotating shaft of the motor 11 is connected to the second sun gear of the planetary gear mechanism. The first sun gear 14 is relatively fixed to the second planetary carrier 13 and is used to drive the first sun gear 14 to rotate through the second planetary carrier 13. The double-row planetary gear transmission mechanism has a compact structure and is also beneficial for the reducer to control the rotational speed. In this embodiment, the placement of the first planetary gear 6 on the first planetary carrier 7 and the placement of the second planetary gear 8 on the second planetary carrier 13 are not specifically limited. The planetary gears can be rotatably mounted on the planetary carrier, allowing them to rotate on their own axes and revolve around their corresponding sun gears. To enable the planetary gears to mesh with their corresponding internal gear rings, each planetary gear can protrude from its corresponding planetary carrier, avoiding interference. In this embodiment, both the first sun gear 14 and the second sun gear are on the rotational central axis. Three first planetary gears 6 and three second planetary gears 8 can be provided, with their revolution centers coinciding with the rotational central axis. Alternatively, one or two first planetary gears 6 and two second planetary gears can be provided. In this embodiment, the shaft of the motor 11 is connected to the second sun gear of the planetary gear mechanism. The second sun gear can be keyed to the output end of the shaft, or it can be integrally mounted on the shaft of the motor 11. Alternatively, the second sun gear can have a central shaft, which is fixedly connected to the shaft of the motor 11 to transmit power.

[0031] In some embodiments, the planetary gear mechanism may also be a single-row planetary gear mechanism, which includes a sun gear, a planet carrier, and planet gears. The sun gear is driven by the motor 11 as a power input component. The planet gears are mounted on the planet carrier and mesh with the sun gear and the first internal gear ring 5. The planet carrier is fixed to the end cover 9 of the motor 11. During operation, the sun gear drives the planet gears to rotate, and the planet gears drive the connecting member 4 to rotate through the first internal gear ring 5.

[0032] In one embodiment, such as Figure 2As shown, a second internal gear ring 12 is integrally mounted on the first planetary carrier 7, forming a relatively fixed relationship between the second internal gear ring 12 and the first planetary carrier 7. The first planetary carrier 7 and the second internal gear ring 12 are an integral structure, which can further improve the integration of the reducer and reduce its size. The second internal gear ring 12 and the first planetary carrier 7 can rotate synchronously, resulting in good transmission efficiency and stable and reliable power transmission. The integral second internal gear ring 12 and the first planetary carrier 7 can also be formed by, but not limited to, casting, or can also be manufactured by machining. In some embodiments, the second internal gear ring 12 can also be fixedly connected to the first planetary carrier 7, for example, the second internal gear ring 12 can be embedded in the first planetary carrier 7.

[0033] In one embodiment, such as Figure 1 , Figure 2 As shown, one end of the first planetary carrier 7 is fixedly connected to the end cover 9 of the motor 11, and the other end of the first planetary carrier 7 is supported in the connecting member 4 by a bearing. The first planetary carrier 7 has a central hole in which the first sun gear 14, the second sun gear, the second planetary carrier 13, the second planet gear 8, and the second internal gear ring 12 are all located. The first sun gear 14 is relatively fixedly disposed at one end of the second planetary carrier 13 and meshes with the first planet gear 6 on the first planetary carrier 7. The second planet gear 8 is disposed at the other end of the second planetary carrier 13 and meshes with the second sun gear. One end of the first planetary carrier 7 is fixedly connected to the end cover 9 of the motor 11. The first planetary carrier 7 is a non-rotating component in the transmission mechanism and mainly serves to support the first planet gear 6. The other end of the first planetary carrier 7 is supported in the connecting member 4 by a bearing, and the connecting member 4 can rotate relative to the first planetary carrier 7. The second planetary carrier 13 is located inside the first planetary carrier 7, which can further improve the integration of the reducer and reduce its size. In some embodiments, the second planetary carrier 13 can be mounted in the center hole of the first planetary carrier 7 via bearings, or the outer periphery of a portion of the shaft section of the second planetary carrier 13 can be rotatably fitted with the hole wall of the center hole of the first planetary carrier 7. The first sun gear 14 is relatively fixedly disposed at one end of the second planetary carrier 13. This can be achieved by having a shaft structure at one end of the second planetary carrier 13, with the first sun gear 14 mounted on the shaft structure via a key, or by having the first sun gear 14 integrally disposed on the shaft structure. The other end of the second planetary carrier 13 can be provided with an eccentric shaft structure, with the planet gears rotatably mounted on the corresponding eccentric shaft structure. In some embodiments, the first planetary carrier 7 and the second planetary carrier 13 can also be arranged side by side. For example, the second planetary carrier 13 can be disposed between the first planetary carrier 7 and the end cover 9 of the motor 11. The first planetary carrier 7 can be fixed to other parts and can still be configured as a non-rotating component. The second planetary carrier 13 is supported on the end cover 9 of the motor 11 by bearings.

[0034] In one embodiment, such as Figure 1 , Figure 2As shown, the first planetary carrier 7 is supported within the connecting member 4 by bearings. The end of the connecting member 4 away from the motor 11 is inserted into the shaft hole of the hub 2. The end of the connecting member 4 near the motor 11 is provided with a first flange 401, which is used to connect and fix it to the hub 2. In this embodiment, the first internal gear ring 5 has several teeth, which are evenly distributed circumferentially within the connecting member to form the first internal gear ring 5. The first planetary carrier 7 is supported within the connecting member 4 by bearings, which facilitates the rotatable setting of the connecting member 4. In some embodiments, bearings supporting the first planetary carrier 7 may be provided on both sides of the first internal gear ring 5 within the connecting member 4, which helps to improve the overlap between the central axis of the connecting member 4 and the central axis of the first planetary carrier 7, and improves the rotational balance of the connecting member 4. The connecting member 4 is connected and fixed to the hub 2 by the first flange 401, which allows all shaft segments on the connecting member 4 except for the first flange 401 to fit into the shaft hole of the hub 2, and also helps to improve the integration of the drive wheel. Multiple mounting holes can be provided on the first flange 401, and multiple mounting holes can be correspondingly provided on one end face of the hub 2. During assembly, bolts are passed through the mounting holes on the first flange 401 and the mounting holes on the hub 2 to form a fixed connection between the connector 4 and the hub 2. In some embodiments, when the hollow structure of the connector 4 is a through hole, a baffle 3 can be fixedly provided at the end away from the motor 11 to cover and block the end opening of the connector 4.

[0035] In one embodiment, such as Figure 1 , Figure 2 As shown, a second flange 701 is provided at one end of the first planetary carrier 7, and the second flange 701 is fixedly connected to the end cover 9 of the motor 11. A first planetary gear 6 is provided at the other end of the first planetary carrier 7. The first planetary carrier 7 is fixedly connected to the end cover 9 of the motor 11 through the second flange 701, which facilitates the fixation of the first planetary carrier 7 on the end cover 9 of the motor 11. In some embodiments, multiple through holes can be provided on the second flange 701 and the end cover 9, and the first planetary carrier 7 and the end cover 9 can be fixed together by bolts or screws passing through the through holes on the second flange 701 and the end cover 9. In some application scenarios, multiple through holes can be provided on the second flange 701, the end cover 9, and the motor housing, and the first planetary carrier 7, the end cover 9, and the motor 11 can be fixed together by bolts or screws passing through the through holes on the second flange 701, the end cover 9, and the motor housing. This not only simplifies assembly but also improves the integration of the drive wheels. In some embodiments, the first planetary carrier 7 can also be fixedly connected to the end cover 9 of the motor 11 by other structures, such as by multiple lugs.

[0036] In one embodiment, the first planetary gear 6, the first sun gear 14, and the first internal gear ring 5 are all helical gears; and / or, the second planetary gear 8, the second sun gear, and the second internal gear ring 12 are all helical gears. When helical gears mesh, the tooth surface contact line is spirally progressive, and multiple teeth mesh simultaneously, which can effectively reduce impact vibration, resulting in smoother transmission. Furthermore, helical gears have good load-bearing capacity, a large helical tooth meshing area, and a more uniform load distribution. In some embodiments, the first planetary gear 6, the first sun gear 14, and the first internal gear ring 5 may also be spur gears; the second planetary gear 8, the second sun gear, and the second internal gear ring 12 may also be spur gears.

[0037] In one embodiment, such as Figure 4 , Figure 5 As shown, an end cover 9 is provided at one end of the motor 11. The end cover 9 has a through hole in the middle for the shaft to extend out. The end cover 9 has a first mounting part 903 and a second mounting part 904. The first mounting part 903 is used to fix the driver 10, and the second mounting part 904 is used for external mounting of the hub drive assembly. Fixing the driver 10 through the first mounting part 903 allows the driver 10 to be integrated into the motor 11, improving the integration of the drive wheel. Furthermore, the connecting wires of the motor 11 (such as encoder cables, power lines, and brake lines) can be directly connected to the driver 10, facilitating assembly. The second mounting part 904 is used for external mounting of the hub drive assembly. That is, during use, the assembled hub drive assembly or the assembled drive wheel can be directly mounted on the object using the hub drive assembly or drive wheel through the second mounting part 904. External mounting is achieved through the motor 11 end cover 9, eliminating the need for additional assembly components. Moreover, the motor 11 end cover 9 simultaneously achieves the installation of the driver 10 and external mounting, eliminating the need for two separate mounting components, reducing the number of parts, and simplifying assembly.

[0038] In one embodiment, such as Figure 4As shown, a support surface 901 is provided on one side of the end cover 9. The support surface 901 has a first mounting hole, which is a first mounting portion 903. Alternatively, extension portions 902 are provided on opposite sides of the end cover 9. The extension portions 902 extend radially along the shaft and protrude from the side wall of the motor 11. Second mounting holes are provided on the extension portions 902, which are second mounting portions 904. The first mounting hole is used to fix the driver 10 to the support surface 901 with screws. Fixing the driver 10 via the first mounting hole is simple and quick. With the support of the support surface 901, the driver 10 is stably fixed on the end cover 9. In some embodiments, to provide good support for the driver 10, the width of the support surface 901 can be relatively increased. However, to avoid increasing the volume of the hub drive assembly due to an excessively wide support surface 901, a groove can be provided on the side of the end cover 9 near the hub 2, allowing the second flange 701 of the first planetary carrier 7 to be embedded in the groove. The screws and bolts in this embodiment can be interchanged as needed. The extension 902 has a second mounting hole for screws to pass through, which increases the distance between the second mounting holes on opposite sides, resulting in better fixation during external installation. The extension 902 also protrudes from the side wall of the motor 11, facilitating assembly. In some applications, the first mounting portion 903 and the second mounting portion 904 can also be other structures provided on the end cover 9, such as adhesive surfaces, snap-fit ​​portions, magnetic attachment portions, etc.

[0039] In the hub drive assembly of the above embodiment, a first internal gear ring 5 is integrally formed on the inner wall of the connector 4. During operation, the shaft of the motor 11 drives the planetary gear mechanism. Because the first planetary gear 6 meshes with the first internal gear ring 5, the first planetary gear 6 can drive the connector 4 to rotate, thereby driving the hub 2, which is fixed to the connector 4, to rotate, thus realizing the rolling of the drive wheel. The first internal gear ring 5 and the connector 4 are an integral structure, which can improve the integration of the reducer, reduce the overall size of the reducer, and the transmission efficiency is better and the power transmission is more stable and reliable.

[0040] Please see Figure 5 , Figure 6 This application embodiment also provides a drive wheel, including a hub 2, a rubber coating 1, and a hub drive assembly as described above. The connector 4 is connected and fixed to the hub 2, and the rubber coating 1 covers the outer circumference of the hub 2.

[0041] It is understood that the wheel hub drive assembly in this embodiment is the same as that in the above embodiments, and will not be described again here. The rubber coating 1 in this embodiment can be, but is not limited to, a tire, which is mounted on the outer circumference of the wheel hub 2 and covers the outer circumference of the wheel hub 2. The drive wheel in this embodiment can be applied to, but is not limited to, automobiles, tricycles, balance scooters, wheelchairs, and other devices. In some embodiments, the drive wheel may also include a driver 10, which is fixed by a first mounting portion 903 provided on the end cover 9 of the motor 11.

[0042] In the drive wheel of the above embodiment, a first internal gear ring 5 is integrally formed on the inner wall of the connecting member 4. During operation, the rotating shaft of the motor 11 drives the planetary gear mechanism to operate. Because the first planetary gear 6 meshes with the first internal gear ring 5, the first planetary gear 6 can drive the connecting member 4 to rotate, thereby driving the hub 2, which is fixed to the connecting member 4, to rotate, thus realizing the rolling of the drive wheel. The first internal gear ring 5 and the connecting member 4 are an integral structure, which can improve the integration of the reducer, reduce the overall size of the reducer, and the transmission efficiency is better and the power transmission is more stable and reliable.

[0043] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A wheel hub drive assembly, characterized by The application relates to a wheel hub driving assembly. The planetary gear mechanism comprises a first planetary gear, a first planetary carrier, a first sun gear, a second planetary gear, a second planetary carrier, a second sun gear and a second inner gear ring, the second sun gear is engaged with the second planetary gear, the second planetary gear is arranged on the second planetary carrier and is engaged with the second inner gear ring, the second inner gear ring is fixed relative to the first planetary carrier, the first sun gear is engaged with the first planetary gear, and the first planetary gear is arranged on the first planetary carrier; the rotating shaft of the motor is connected with the second sun gear of the planetary gear mechanism, the first sun gear is fixed relative to the second planetary carrier and is used for driving the first sun gear to rotate through the second planetary carrier.

2. The hub drive assembly of claim 1, wherein, The first planetary carrier is integrally provided with the second inner gear ring, and relative fixation between the second inner gear ring and the first planetary carrier is formed.

3. The hub drive assembly of claim 2, wherein, One end of the first planetary carrier is fixedly connected with the end cover of the motor, and the other end of the first planetary carrier is supported in the connecting piece through a bearing, the first planetary carrier is provided with a center hole, the first sun gear, the second sun gear, the second planetary carrier, the second planetary gear and the second inner gear ring are located in the center hole, the first sun gear is fixedly arranged at one end of the second planetary carrier and is engaged with the first planetary gear on the first planetary carrier, and the second planetary gear is arranged at the other end of the second planetary carrier and is engaged with the second sun gear.

4. The hub drive assembly of claim 2, wherein, The first planetary carrier is supported in the connecting piece through a bearing, one end of the connecting piece away from the motor is inserted into a shaft hole of the wheel hub, and the other end of the connecting piece close to the motor is provided with a first flange, the first flange is used for being fixedly connected with the wheel hub.

5. The hub drive assembly of claim 4, wherein, One end of the first planetary carrier is provided with a second flange, the second flange is fixedly connected with the end cover of the motor, and the other end of the first planetary carrier is provided with the first planetary gear.

6. The hub drive assembly of claim 4, wherein, The first planetary gear, the first sun gear and the first inner gear ring are all helical gears; and / or the second planetary gear, the second sun gear and the second inner gear ring are all helical gears.

7. The hub drive assembly of claim 2, wherein, One end of the motor is provided with an end cover, a through hole is formed in the middle of the end cover and is used for extending a rotating shaft, a first mounting part and a second mounting part are arranged on the end cover, the first mounting part is used for fixing a driver, and the second mounting part is used for external installation of the wheel hub driving assembly.

8. The hub drive assembly of any one of claims 1-7, wherein, ​ 9. The hub drive assembly of claim 8, wherein, One side of the end cover is provided with a supporting surface, the supporting surface is provided with a first mounting hole, the first mounting hole is the first mounting part; and / or, opposite sides of the end cover are respectively provided with an extension part, the extension part extends along the radial direction of the rotating shaft and protrudes from the side wall surface of the motor, a second mounting hole is arranged on the extension part, and the second mounting hole is the second mounting part.

10. A drive wheel, characterized by The wheel hub drive assembly comprises a wheel hub, a rubber coating, and a wheel hub drive assembly according to any one of claims 1-9, the connecting piece is connected and fixed with the wheel hub, and the rubber coating covers the outer circumference of the wheel hub.

Images