CN220401506U - Hub direct-drive motor - Google Patents

Abstract

The utility model relates to the field of motors, and discloses a hub direct-drive motor, which comprises: a stator assembly having a forwardly extending connecting shaft; the rotor assembly comprises a magnetic conduction ring and magnetic sheets, and the magnetic sheets are connected with a plurality of magnetic sheets in a surrounding manner at the inner side of the magnetic conduction ring; the tire is connected to the outer side of the magnetic conducting ring, a front positioning groove is formed in the front end of the tire, and a rear positioning groove is formed in the rear end of the tire; the rear end cover is embedded into the front positioning groove, the front end of the rear end cover is provided with a front convex ring which protrudes forwards and props against the rear end of the magnetic conduction ring, and the rear end of the connecting shaft is rotationally connected to the rear end cover; the front end cover is embedded into the rear positioning groove, the rear end of the front end cover is provided with a rear convex ring which protrudes backwards and props against the front end of the magnetic conduction ring, the front end cover is provided with a through hole, and the connecting shaft is rotationally connected with the through hole.

Description

Hub direct-drive motor

Technical Field

The utility model relates to a motor, in particular to a hub direct-drive motor.

Background

The electric hub needs to be applied in many situations, such as moving structures in mowers. The traditional electric hub drives the motor to rotate by using the driving motor, specifically, the hub is rotationally connected to the mower, the driving motor drives the hub to rotate by the speed reducing motor after transmitting power to the speed reducing motor, the transmission structure is large in size and increases the size and weight of the mower, to this, some direct-drive hubs appear on the market, the direct-drive motor is arranged on the mower, then the tire is sleeved on the rotor of the direct-drive motor, the tire with the structure can be directly driven to rotate during working, but the combination stability of the tire and the direct-drive motor is poor, the tire is easy to break away from the direct-drive motor, the service life and the durability are lower, and therefore, the hub direct-drive motor with a more stable and compact structure is needed.

Disclosure of Invention

The utility model aims to provide a hub direct-drive motor, which solves one or more technical problems in the prior art and at least provides a beneficial choice or creation condition.

The utility model solves the technical problems as follows:

a hub direct drive motor comprising: a stator assembly having a forwardly extending connecting shaft; the rotor assembly comprises a magnetic conduction ring and magnetic sheets, wherein a plurality of magnetic sheets are connected with the inner side of the magnetic conduction ring in a surrounding manner; the tire is connected to the outer side of the magnetic conduction ring, a front positioning groove is formed in the front end of the tire, and a rear positioning groove is formed in the rear end of the tire; the rear end cover is embedded into the rear positioning groove, the front end of the rear end cover is provided with a front convex ring which protrudes forwards and props against the rear end of the magnetic conduction ring, and the rear end of the connecting shaft is rotationally connected to the rear end cover; the front end cover is embedded into the front positioning groove, the rear end of the front end cover is provided with a rear convex ring which protrudes backwards and props against the front end of the magnetic conduction ring, the front end cover is provided with a through hole, and the connecting shaft is rotationally connected with the through hole.

The technical scheme has at least the following beneficial effects: in the structure of connecting shaft fixed connection in the peripheral hardware, for example the casing of lawn mower, in the rotor subassembly, the magnetic conduction ring is as the yoke, can be used to connect a plurality of magnetic sheets and fix a position, and strengthen holistic magnetism, when needs drive the tire and rotate, connect the electricity with stator module, stator module and rotor module make the magnetic conduction ring rotate under the interact, thereby drive the tire in the magnetic conduction ring outside and rotate, in this wheel hub direct drive motor, because the front side of tire is provided with the front positioning groove, the rear side of tire is provided with the rear positioning groove, the front end cover passes through the mutually supporting with the front positioning groove, the rear end cover through the mutually supporting with the rear positioning groove, can realize to be with front end cover and rear end cover fast loading into the tire, and receive the friction when rotating and throw away from the magnetic conduction ring, and front end cover and rear end cover all rotate with the connecting shaft and be connected, both realized the relative position to front end cover and rear end cover, in addition, front end cover and rear end cover offset in the front end and rear end of magnetic conduction ring respectively, can press from each other with the tire clamp the location, guarantee to press from both sides tight location with the tire, guarantee the magnetic conduction ring and tire and the tire and fix a position, the connection stability, need not extend along the axial direction along the magnetic conduction ring with the whole structure, the whole is more compact structure is more with the axial direction is more than the whole is guaranteed to the magnetic conduction ring, and is connected with the whole structure, and is more than the end-shaped to the tire, and is more compact to realize, and is more compact and is connected with the whole, and is more than the whole, and can be connected with the structure.

As a further improvement of the technical scheme, the inner side of the front convex ring is protruded forwards to form a front positioning ring, the inner side of the rear convex ring is protruded backwards to form a rear positioning ring, the front positioning ring and the rear positioning ring extend into the magnetic conduction ring, and the outer side of the front positioning ring and the outer side of the rear positioning ring are propped against the inner side of the magnetic conduction ring. The front positioning ring stretches into the magnetic conduction ring from the front end of the magnetic conduction ring, the front position of the magnetic conduction ring can be further positioned, the rear positioning ring stretches into the magnetic conduction ring from the rear end of the magnetic conduction ring, the rear position of the magnetic conduction ring can be further positioned, so that the front end cover and the rear end cover clamp the front end and the rear end of the magnetic conduction ring, and the front end and the rear end of the magnetic conduction ring are further positioned by utilizing hole shaft matching, so that the integral connection is more compact.

As a further improvement of the technical scheme, sealing grooves are formed in the positions, opposite to the magnetic ring, of the front convex ring and the rear convex ring, and sealing rings are sleeved in the two sealing grooves. The protruding front positioning ring and the protruding rear positioning ring form shielding structures on the front convex ring and the rear convex ring respectively, so that water vapor can be prevented from entering inwards, and the sealing ring in the sealing groove is tightly pressed on the end face of the magnetic conduction ring, so that the water vapor can be further prevented from penetrating inwards, and the tightness of the inside is improved.

As a further improvement of the above technical solution, the outer circumference of the tire is provided with a plurality of teeth. When the tyre is applied to the ground, the convex teeth are contacted with the ground, so that the friction force between the convex teeth and the ground can be reduced, and the rotation efficiency is improved.

As a further improvement of the above technical solution, a plurality of teeth arranged around the tire are used as external teeth groups, and at least two external teeth groups are arranged along the front-rear direction, and in any two adjacent external teeth groups, a plurality of teeth in one external teeth group are staggered with a plurality of teeth in the other external teeth group. In the same external tooth group, a gap is reserved between any two adjacent convex teeth, when one convex tooth rotates to leave the ground, the other convex tooth moves to be close to the ground, so that the sense of frustration generated at the moment is reduced, the convex teeth in the other external tooth group are contacted with the ground, smooth switching between the convex teeth to contact with the ground can be realized, and the stability in use is improved.

As a further improvement of the above technical solution, the tire is injection molded on the outer periphery of the magnetic conductive ring. During production, the tire is directly injection molded on the magnetizer, so that the tire and the magnetizer are directly integrated, the subsequent assembly process is reduced, and the structural stability of the tire is further improved.

As a further improvement of the technical scheme, the tire and the magnetic conduction ring are combined to form an outer hub, a mounting hole extending along the front-rear direction is formed in the outer hub, a mounting groove is formed in the front side of the rear end cover and opposite to the mounting hole, a connecting nut is arranged in the mounting groove, a connecting bolt is inserted in the front end cover, and the connecting bolt penetrates through the mounting hole and is connected with the connecting nut. Before the rear end cover is assembled, a connecting nut is firstly arranged in a mounting groove of the rear end cover, then the rear end cover is embedded into a rear positioning groove, at the moment, the connecting nut cannot be outwards separated due to shielding of a notch of the mounting groove by a tire, then the front end cover is embedded into a front positioning groove, a connecting bolt penetrates through the front end cover and is inserted into a mounting hole, the connecting bolt and the connecting nut are mutually matched and connected, and therefore the front end cover and the rear end cover can be further pressed on the front side and the rear side of an outer hub by the aid of the connecting bolt and the connecting nut, and the stability of the whole structure is further improved.

As a further improvement of the technical scheme, the front end cover is provided with a concave spigot at the front end of the through hole, an oil seal is arranged in the concave spigot, and the oil seal sleeve is arranged on the connecting shaft. The oil seal is arranged on the connecting shaft, so that the tightness of the connecting position of the connecting shaft and the front end cover can be enhanced, the water and gas entering into the connecting position between the connecting shaft and the front end cover can be reduced, the concave spigot can be conveniently used for installing and positioning the oil seal, the oil seal can be quickly moved to the front end cover, and the structural stability of the oil seal can be improved.

As a further improvement of the technical scheme, the connecting shaft is of a hollow structure, the outer side of the connecting shaft is provided with wiring holes communicated with the inner side of the connecting shaft, and the connecting shaft is filled with silicone rubber. The electric wires led out by the internal electric elements, such as the electric wires led out by the stator assembly and the electric wires led out by the external encoder, can enter the connecting shaft from the wiring holes and are led out along the axial direction of the connecting shaft, and the connecting shaft is filled with silicone rubber, so that the sealing and waterproof effects on the hollow structure of the connecting shaft can be achieved, water vapor is prevented from entering from the end part of the connecting shaft, the electric wires can be pressed and positioned by the silicone rubber, and the pulling of the electric wires in the use process is reduced.

As a further improvement of the above technical solution, the stator assembly includes a stator core, a coil wound on the stator core, a fixing hole extending in a front-rear direction is provided in a middle portion of the stator core, and the connecting shaft passes through the fixing hole. The connecting shaft is matched with the fixing hole so as to be fixedly connected with the stator core, and when the magnetic conduction ring belt tire is in operation, the coil wound on the stator core is electrified, the whole stator core forms an alternating magnetic field and interacts with the whole magnetic field formed by the rotor assembly, so that the magnetic conduction ring belt tire rotates.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the utility model, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;

fig. 3 is an exploded schematic view of the overall structure of the present utility model.

In the accompanying drawings: 11-connecting shaft, 12-stator core, 13-fixed orifices, 21-magnetic conduction ring, 22-magnetic sheet, 3-tire, 31-front positioning groove, 32-convex tooth, 4-rear end cover, 41-front convex ring, 42-front positioning ring, 43-mounting groove, 5-front end cover, 51-rear convex ring, 52-rear positioning ring, 53-sealing groove, 54-concave spigot, 55-oil seal, 56-connecting nut and 57-connecting bolt.

Detailed Description

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to a connection structure that may be better formed by adding or subtracting connection aids depending on the particular implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.

Referring to fig. 1, 2 and 3, a hub direct drive motor includes: a stator assembly having a connecting shaft 11 extending forward; the rotor assembly comprises a magnetic conduction ring 21 and magnetic sheets 22, wherein a plurality of magnetic sheets 22 are connected with the inner side of the magnetic conduction ring 21 in a surrounding manner; a tire 3 connected to the outer side of the magnetic conductive ring 21, wherein a front positioning groove 31 is formed at the front end of the tire 3, and a rear positioning groove is formed at the rear end of the tire 3; the rear end cover 4 is embedded in the rear positioning groove, the front end of the rear end cover 4 is provided with a front convex ring 41 which protrudes forwards and props against the rear end of the magnetic conduction ring 21, and the rear end of the connecting shaft 11 is rotationally connected to the rear end cover 4; the front end cover 5 is embedded in the front positioning groove 31, the rear end of the front end cover 5 is provided with a rear convex ring 51 protruding backwards and propped against the front end of the magnetic conduction ring 21, the front end cover 5 is provided with a through hole, and the connecting shaft 11 is rotatably connected with the through hole.

In the hub direct-drive motor, a connecting shaft 11 is fixedly connected to a peripheral structure, such as a shell of a mower, a rotor component is provided with a magnetic conduction ring 21 serving as a magnetic yoke, a plurality of magnetic sheets 22 can be connected and positioned, the overall magnetism is enhanced, when a tire 3 needs to be driven to rotate, a stator component is electrified, the stator component and the rotor component are interacted to enable the magnetic conduction ring 21 to rotate, so that the tire 3 outside the magnetic conduction ring 21 is driven to rotate, in the hub direct-drive motor, as the front side of the tire 3 is provided with a front positioning groove 31, the rear side of the tire 3 is provided with a rear positioning groove, the front end cover 5 and the rear end cover 4 can be rapidly assembled into the tire 3 through the interaction of the front end cover 5 and the rear positioning groove, the tire 3 is prevented from being flung out of the magnetic conduction ring 21 due to friction during rotation, the front end cover 5 and the rear end cover 4 are rotationally connected with the connecting shaft 11, so that the relative position of the front end cover 5 and the rear end cover 4 is fixed, the stress stability of the connecting shaft 11 is improved, in addition, the front end cover 5 and the rear end cover 4 are respectively propped against the front end and the rear end of the magnetic ring 21, the magnetic ring 21 and the tire 3 can be clamped and positioned, the stability of connection between the magnetic ring 21 and the tire 3 is ensured, a surrounding structure extending along the circumferential direction is not needed to protect a rotor assembly and a stator assembly, the tire 3 is directly connected onto the magnetic ring 21, the whole size and the whole quality are reduced, the magnetic ring 21 and the tire 3 are further limited along the axial direction by the front end cover 5 and the rear end cover 4, the whole structure is more compact and stable, the whole service life is prolonged, and efficient power transmission is realized.

The rear part of the mounting hole is provided with a front bearing chamber, the front side of the rear end cover 4 is provided with a rear bearing chamber, bearings are respectively arranged in the front bearing chamber and the rear bearing chamber, the outer sides of the connecting shafts 11 are respectively connected with the inner rings of the two bearings, the rear ends of the connecting shafts 11 are rotationally connected to the rear end cover 4, and the connecting shafts 11 are rotationally connected in the through holes.

In order to strengthen the further fastening and positioning of the magnetic ring 21, besides the front and rear ends of the magnetic ring 21, the front convex ring 51 on the front end cover 5 and the front convex ring 41 on the rear end cover 4 are abutted against each other, in this embodiment, the inner side of the front convex ring 41 is protruded forward and forms a front positioning ring 42, the inner side of the rear convex ring 51 is protruded backward and forms a rear positioning ring 52, the front positioning ring 42 and the rear positioning ring 52 extend into the magnetic ring 21, and the outer sides of the front positioning ring 42 and the rear positioning ring 52 are abutted against the inner side of the magnetic ring 21. The front positioning ring 42 extends into the magnetic conductive ring 21 from the front end of the magnetic conductive ring 21 to further position the front position of the magnetic conductive ring 21, and the rear positioning ring 52 extends into the magnetic conductive ring 21 from the rear end of the magnetic conductive ring 21 to further position the rear position of the magnetic conductive ring 21, so that the front end cover 5 and the rear end cover 4 clamp the front end and the rear end of the magnetic conductive ring 21, and further position the front end and the rear end of the magnetic conductive ring 21 by using hole shaft matching, so that the integral connection is more compact.

In practical application, an annular concave angle is formed between the outer side of the convex front convex ring 41 and the front side of the rear end cover 4, an annular convex corner can be correspondingly arranged on the rear end face of the tire 3 and matched with the annular concave angle, so that the connection between the rear end cover 4 and the tire 3 is enhanced, an annular concave angle is formed between the outer side of the convex rear convex ring 51 and the rear side of the front end cover 5, and an annular convex corner can be correspondingly arranged on the front end face of the tire 3 and matched with the front end cover 5, so that the connection between the front end cover 5 and the tire 3 is enhanced.

In order to further prevent water vapor from penetrating inward between the front end cover 5 and the front end surface of the tire 3 and between the rear end cover 4 and the rear end surface of the tire 3, in this embodiment, sealing grooves 53 are disposed at positions where the front convex ring 41 and the rear convex ring 51 face the magnetic ring 21, and sealing rings are respectively sleeved in the sealing grooves 53. The front positioning ring 42 and the rear positioning ring 52 form shielding structures on the front convex ring 41 and the rear convex ring 51 respectively, so that water vapor can be prevented from entering the inside, and the sealing ring in the sealing groove 53 is tightly pressed on the end surface of the magnetic conducting ring 21, so that the water vapor can be further prevented from penetrating the inside, and the tightness of the inside is improved.

In order to reduce the friction to which the tyre 3 is subjected and to increase the rotation efficiency of the rotor assembly, in this embodiment the tyre 3 is provided circumferentially with a plurality of teeth 32. When the tire 3 is applied to the ground, the convex teeth 32 are used for contacting the ground, so that the friction force between the tire and the ground can be reduced, and the rotation efficiency is improved.

Further, a plurality of teeth 32 arranged around the tire 3 are used as an external tooth group, at least two teeth are arranged in the front-rear direction in the external tooth group, and in any two adjacent external tooth groups, a plurality of teeth 32 in one external tooth group are staggered with a plurality of teeth 32 in the other external tooth group. In the same external tooth group, a gap is reserved between any two adjacent convex teeth 32, and when one convex tooth 32 rotates to leave the ground, the other convex tooth 32 moves close to the ground, so that the convex teeth 32 in the other external tooth group are contacted with the ground in order to reduce the feel of the shock generated at the moment, the convex teeth 32 can be smoothly switched to be contacted with the ground, and the stability in use is improved.

In order to make the connection between the tire 3 and the magnetic conductive ring 21 more compact, in this embodiment, the tire 3 is injection molded on the outer periphery of the magnetic conductive ring 21. During production, the tire 3 is directly injection molded on the magnetizer, so that the tire 3 and the magnetizer are directly integrated, the subsequent assembly process is reduced, and the structural stability of the tire 3 is further improved.

In the above embodiment, the front end cover 5 and the rear end cover 4 are respectively embedded into the front positioning groove 31 and the rear positioning groove, a connecting piece can be driven between the front end cover 5 and the front side of the tire 3 and between the rear end cover 4 and the rear side of the tire 3, so that the front end cover 5 and the rear end cover 4 are further fastened on the tire 3, in this embodiment, the tire 3 and the magnetic conductive ring 21 are combined to form an outer hub, a mounting hole extending along the front-rear direction is formed in the outer hub, the mounting hole can be completely opened in the tire 3 or the magnetic conductive ring 21, or both the tire 3 and the magnetic conductive ring 21 are opened with slotted holes, the slotted holes on the tire 3 and the slotted holes of the magnetic conductive ring 21 enclose each other to form a mounting hole, a mounting groove 43 is formed at a position where the front side of the rear end cover 4 faces the mounting hole, a connecting nut 56 is arranged in the mounting groove 43, and a connecting bolt 57 penetrates through the mounting hole and is connected to the connecting nut 56. Before the rear end cover 4 is assembled, the connecting nut 56 is firstly arranged in the mounting groove 43 of the rear end cover 4, then the rear end cover 4 is embedded into the rear positioning groove, at the moment, the connecting nut 56 cannot be outwards separated due to the shielding of the tire 3 on the notch of the mounting groove 43, then the front end cover 5 is embedded into the front positioning groove 31, the connecting bolt 57 penetrates through the front end cover 5 and is inserted into the mounting hole, the connecting bolt 57 and the connecting nut 56 are mutually matched and connected, and the front end cover 5 and the rear end cover 4 can be further pressed on the front side and the rear side of the outer hub by utilizing the connecting bolt 57 and the connecting nut 56, so that the stability of the whole structure is further improved. In practical applications, the connection nuts 56 and the connection bolts 57 are used as a set of reinforcing structures, a plurality of sets of reinforcing structures are arranged around the connection shaft 11, and a plurality of corresponding mounting holes and mounting grooves 43 are also arranged.

In order to enhance the connection tightness between the connecting shaft 11 and the front end cover 5, in this embodiment, a concave spigot 54 is disposed at the front end position of the front end cover 5 located at the through hole, an oil seal 55 is disposed in the concave spigot 54, and the oil seal 55 is sleeved on the connecting shaft 11. The oil seal 55 is sleeved on the connecting shaft 11, so that the tightness of the joint of the connecting shaft 11 and the front end cover 5 can be enhanced, water and gas are reduced from entering the interior from the joint between the connecting shaft and the front end cover 5, the concave spigot 54 can conveniently mount and position the oil seal 55, the oil seal 55 can rapidly move to the front end cover 5, and the structural stability of the oil seal 55 is improved.

In order to facilitate internal routing, in this embodiment, the connection shaft 11 is of a hollow structure, routing holes communicating with the inside of the connection shaft 11 are provided on the outer side of the connection shaft 11, and silicone rubber is filled in the connection shaft 11. The electric wires led out by the internal electric elements, such as the electric wires led out by the stator assembly and the electric wires led out by the external encoder, can enter the connecting shaft 11 from the wiring holes and are led out along the axial direction of the connecting shaft 11, and the connecting shaft 11 is also filled with silicone rubber, so that the sealing and waterproof effects on the hollow structure of the connecting shaft 11 can be achieved, the water vapor is prevented from entering from the end part of the connecting shaft 11, the electric wires can be pressed and positioned by the silicone rubber, and the pulling of the electric wires in the use process is reduced.

In order to facilitate the connection of the connection shaft 11 to the structure of the external device, external threads may be provided on the front outer side of the connection shaft 11 so that the connection shaft 11 may be screwed to the structure of the external device.

As a further structural embodiment of the stator assembly, the stator assembly includes a stator core 12, a coil wound around the stator core 12, a fixing hole 13 extending in the front-rear direction is provided at a central portion of the stator core 12, and the connection shaft 11 passes through the fixing hole 13. The connecting shaft 11 is fixedly connected with the stator core 12 through the cooperation of the fixing hole 13, and is electrified to the coil wound on the stator core 12 when in operation, the whole stator core 12 forms an alternating magnetic field and interacts with the whole magnetic field formed by the rotor assembly, so that the magnetic conduction ring 21 drives the tire 3 to rotate.

While the preferred embodiments of the present utility model have been illustrated and described, the present utility model is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a wheel hub directly drives motor which characterized in that: comprising the following steps:

a stator assembly having a forwardly extending connecting shaft (11);

the rotor assembly comprises a magnetic conduction ring (21) and magnetic sheets (22), wherein the magnetic sheets (22) are connected with a plurality of magnetic conduction rings (21) in a surrounding mode;

the tyre (3) is connected to the outer side of the magnetic conduction ring (21), a front positioning groove (31) is formed in the front end of the tyre (3), and a rear positioning groove is formed in the rear end of the tyre (3);

the rear end cover (4) is embedded into the rear positioning groove, the front end of the rear end cover (4) is provided with a front convex ring (41) which protrudes forwards and props against the rear end of the magnetic conduction ring (21), and the rear end of the connecting shaft (11) is rotationally connected to the rear end cover (4);

the front end cover (5) is embedded into the front positioning groove (31), the rear end of the front end cover (5) is provided with a rear convex ring (51) protruding backwards and propping against the front end of the magnetic conducting ring (21), the front end cover (5) is provided with a through hole, and the connecting shaft (11) is rotationally connected to the through hole.

2. A hub direct drive motor as defined in claim 1, wherein: the inner side of the front convex ring (41) protrudes forwards to form a front positioning ring (42), the inner side of the rear convex ring (51) protrudes backwards to form a rear positioning ring (52), the front positioning ring (42) and the rear positioning ring (52) extend into the magnetic conducting ring (21), and the outer side of the front positioning ring (42) and the outer side of the rear positioning ring (52) are propped against the inner side of the magnetic conducting ring (21).

3. A hub direct drive motor as defined in claim 2, wherein: the front convex ring (41) and the rear convex ring (51) are provided with sealing grooves (53) at positions opposite to the magnetic conducting rings (21), and sealing rings are sleeved in the two sealing grooves (53).

4. A hub direct drive motor as defined in claim 1, wherein: a plurality of convex teeth (32) are arranged around the periphery of the tire (3).

5. The hub direct drive motor as set forth in claim 4, wherein: the tire is characterized in that a plurality of convex teeth (32) which are arranged around the tire (3) are used as an external tooth group, at least two external tooth groups are arranged along the front-back direction, and in any two adjacent external tooth groups, the convex teeth (32) in one external tooth group are staggered with the convex teeth (32) in the other external tooth group.

6. A hub direct drive motor as defined in claim 1, wherein: the tyre (3) is injection molded on the periphery of the magnetic conducting ring (21).

7. The hub direct drive motor of claim 6, wherein: the tyre (3) and the magnetic ring (21) are combined to form an outer hub, a mounting hole extending along the front-rear direction is formed in the outer hub, a mounting groove (43) is formed in the position, opposite to the mounting hole, of the front side of the rear end cover (4), a connecting nut (56) is arranged in the mounting groove (43), a connecting bolt (57) is inserted in the front end cover (5), and the connecting bolt (57) penetrates through the mounting hole and is connected to the connecting nut (56).

8. A hub direct drive motor as defined in claim 1, wherein: the front end cover (5) is located at the front end of the through hole and is provided with a concave spigot (54), an oil seal (55) is arranged in the concave spigot (54), and the oil seal (55) is sleeved on the connecting shaft (11).

9. A hub direct drive motor as defined in claim 1, wherein: the connecting shaft (11) is of a hollow structure, wiring holes which are mutually communicated with the inside of the connecting shaft (11) are formed in the outer side of the connecting shaft (11), and silicon rubber is filled in the connecting shaft (11).

10. A hub direct drive motor as defined in claim 1, wherein: the stator assembly comprises a stator core (12) and a coil wound on the stator core (12), wherein a fixing hole (13) extending along the front-back direction is formed in the middle of the stator core (12), and the connecting shaft (11) penetrates through the fixing hole (13).