Wheel hub motor and electric bicycle

Abstract

The utility model discloses a kind of hub motor and electric bicycle.The hub motor includes motor shell, stator assembly, rotor assembly, and power supply lead wire;The front end of motor shell is equipped with first via hole;Stator assembly includes stator shell, stator winding structure and stator circuit board, and second via hole is equipped on stator shell;Rotor assembly includes first bearing, shaft body structure and rotor structure;In the radial direction along shaft body structure, the inner ring side of first bearing and shaft body structure are interval arrangement;First via hole and second via hole are all surrounded in the outer circumferential side of shaft body structure, and all located in the interval between first bearing and shaft body structure;One end of power supply lead wire is from first via hole and second via hole into stator shell, and is electrically connected with stator circuit board.The hub motor provided by the utility model can ensure the integrity of shaft body structure, so that the strength is better, the whole hub motor is more stable, and the working life of hub motor can be effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of motors, specifically to a hub motor and an electric bicycle. Background Technology

[0002] A hub motor is a drive system that integrates core power components such as a drive motor, reduction gear, and braking system inside the wheel hub. When operating, a hub motor requires power to supply energy to the stator assembly via a power supply device (such as a battery pack). This creates magnetic flux between the stator and rotor assemblies, driving the rotor assembly to rotate and thus the wheel. Traditional hub motors, where the power cable is led out from inside the motor, often lack sufficient space for routing. This necessitates creating through holes in the shaft for the cable to pass through, but this design compromises the shaft's strength and carries the risk of breakage. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the main purpose of this utility model is to provide a hub motor and an electric bicycle, which aims to solve the problem that the traditional hub motor setting method will affect the strength of the axle and pose a risk of axle breakage.

[0004] To achieve the above objectives, this utility model proposes a hub motor, comprising:

[0005] The motor housing has a first through hole at its front end;

[0006] The stator assembly includes a stator housing disposed within the motor housing, a stator winding structure disposed within the stator housing, and a stator circuit board electrically connected to the stator winding structure. The stator housing is provided with a second through hole that communicates with the first through hole.

[0007] The rotor assembly includes a first bearing, a shaft structure, and a rotor structure disposed on the shaft structure. The first bearing is rotatably connected to the motor housing and the stator housing. The shaft structure passes through the stator housing and is coaxially arranged with the first bearing. The stator winding structure surrounds the outer periphery of the rotor structure.

[0008] Along the radial direction of the shaft structure, the inner ring side of the first bearing and the shaft structure are spaced apart; the first through hole and the second through hole are both circumferentially disposed on the outer periphery of the shaft structure and are both located within the gap between the first bearing and the shaft structure;

[0009] The power supply wire passes through the first and second through holes into the stator housing and is electrically connected to the stator circuit board.

[0010] Optionally, the diameter of the first via is larger than the diameter of the second via, and the power supply wire is inserted into and connected to the second via.

[0011] Optionally, the front end of the stator housing has a protruding flange, which is inserted into the first through hole, and the second through hole is provided to penetrate the flange;

[0012] The power supply conductor includes a power line and a connector plug located at the end of the power line; the stator circuit board includes a circuit board body and a connector socket located on the circuit board body, wherein at least one of the connector plug and the connector socket is located within the second through hole, such that the connector plug and the connector socket are plugged into each other.

[0013] Optionally, the circuit board body is disposed in the gap between the stator winding structure and the front sidewall of the stator housing, and the circuit board body extends radially along the shaft structure; the connector plug and the connector socket are both at least partially inserted into the second through hole.

[0014] Optionally, a first protruding ring is provided on the outer side of the front sidewall of the stator housing, and a second protruding ring is provided on the inner side of the front sidewall of the motor housing. The first bearing is sleeved between the first protruding ring and the second protruding ring to rotatably connect the motor housing and the stator housing.

[0015] Optionally, a first mounting portion is provided on the front sidewall of the motor housing, the first mounting portion being adapted to connect with the brake pads of the vehicle, wherein, in the orthogonal projection along the axial direction of the shaft structure, the projection of the first mounting portion is located within the projection area of ​​the inner ring side of the first bearing.

[0016] Optionally, the shaft structure includes a first shaft, and a first fixed shaft and a second fixed shaft located at both ends of the first shaft in the axial direction, the first fixed shaft being disposed on the front side wall of the stator housing, and the second fixed shaft being disposed on the rear side of the motor housing;

[0017] The rotor structure is mounted on the first shaft. The rotation of the rotor structure can drive the first shaft to rotate. Both the first fixed shaft and the second fixed shaft are non-rotating.

[0018] Optionally, the hub motor further includes a one-way clutch, wherein the inner ring of the one-way clutch is sleeved on the outer side of the first shaft, and the outer ring of the one-way clutch is sleeved on the inner side of the rotor structure; and / or,

[0019] The connector includes a plug body and a plug portion protruding from one side of the plug body. The plug body is arranged in a ring shape to be fitted onto the outside of the first fixed shaft. The shape of the plug portion matches the shape of the second through hole.

[0020] Optionally, the rotor assembly further includes a second bearing and a third bearing sleeved on the first shaft, the second bearing being mounted on the stator housing, and the third bearing being sleeved on the inner side of the rotor structure;

[0021] The third bearing and the one-way clutch are arranged side by side along the axial direction of the first shaft; or, the third bearing and the one-way clutch are integrated into one piece.

[0022] This utility model also provides an electric bicycle, including the aforementioned hub motor.

[0023] The technical solution provided by this utility model has the following beneficial effects:

[0024] The hub motor provided by this utility model includes a motor housing, a stator assembly, a rotor assembly, and a power supply conductor. The stator winding structure surrounds the outer periphery of the rotor structure, forming a radial air gap between them. Electrical energy from a power supply device (such as a battery pack) can be transmitted to the stator circuit board via the power supply conductor. After conversion by the stator circuit board, the energy is introduced into the stator winding. When current flows through the stator winding structure, a magnetic flux is formed between the magnets of the stator winding structure and the rotor structure. Alternating current drives the rotor structure to rotate, which in turn drives the wheel to rotate, thus propelling the vehicle. The inner diameter of the first bearing, which rotatably connects the motor housing and the stator housing, is set to be relatively large, creating a radial gap between the inner side of the first bearing and the shaft structure. This gap provides sufficient space for the first and second through holes for the power supply conductor, eliminating the need for through holes in the shaft structure. This ensures the integrity of the shaft structure, resulting in better strength, improved stability of the entire hub motor operation, and extended service life. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A schematic diagram of an embodiment of a hub motor provided by this utility model;

[0027] Figure 2 for Figure 1 A cross-sectional structural diagram of the hub motor described in the figure;

[0028] Figure 3 for Figure 1 An exploded view of the hub motor described above;

[0029] Figure 4 for Figure 1 A partial exploded view of the hub motor described in the figure.

[0030] Explanation of icon numbers:

[0031] 100-Hub motor; 1-Motor housing; 11-Main motor housing; 111-First through hole; 112-First mounting part; 12-Motor rear cover; 2-Stator assembly; 21-Stator housing; 211-Main stator housing; 2111-Second through hole; 212-Stator rear cover; 22-Stator winding structure; 23-Stator circuit board; 231-Circuit board body; 232-Conductor socket; 3-Rotor assembly; 31-Shaft structure; 311 - First shaft; 312 - First fixed shaft; 313 - Second fixed shaft; 32 - Rotor structure; 321 - Rotor disc; 322 - Rotor bushing; 4 - Reduction gear; 41 - Sun gear; 42 - Internal gear ring; 5 - One-way clutch; 61 - First bearing; 62 - Second bearing; 63 - Third bearing; 64 - Fourth bearing; 7 - Power supply wire; 71 - Power cord; 72 - Connector plug; 721 - Plug body; 722 - Plug part.

[0032] The realization of the purpose, functional characteristics and excellent effects of this utility model will be further explained below in conjunction with specific embodiments and accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model provides a hub motor 100. For details, please refer to [link / reference needed]. Figures 1 to 2 In this embodiment, the hub motor 100 includes a motor housing 1, a stator assembly 2, a rotor assembly 3, and a power supply conductor 7. The front end of the motor housing 1 has a first through-hole 111. The stator assembly 2 includes a stator housing 21 disposed within the motor housing 1, a stator winding structure 22 disposed within the stator housing 21, and a stator circuit board 23 electrically connected to the stator winding structure 22. The stator housing 21 has a second through-hole 2111 communicating with the first through-hole 111. The rotor assembly 3 includes a first bearing 61, a shaft structure 31, and a rotor structure 32 disposed on the shaft structure 31. The first bearing 61 is rotatably connected to the motor housing 1 and the stator housing 21. The shaft structure 31 passes through the stator housing 21 and is coaxially arranged with the first bearing 61. The stator winding structure 22 surrounds the outer periphery of the rotor structure 32. Along the radial direction of the shaft structure 31, the inner ring side of the first bearing 61 and the shaft structure 31 are spaced apart; the first through hole 111 and the second through hole 2111 are both arranged around the outer periphery of the shaft structure 31 and are both located within the interval between the first bearing 61 and the shaft structure 31. One end of the power supply wire 7 passes through the first through hole 111 and the second through hole 2111 into the stator housing 21 and is electrically connected to the stator circuit board 23.

[0037] In this embodiment, the other end of the power supply wire 7 is adapted to be connected to a power supply device (such as a battery pack). The stator winding structure 22 may include a stator core and a stator winding wound around the outer periphery of the stator core. The power supply wire 7 can transmit electrical energy from the power supply device to the stator circuit board 23, and after conversion by the stator circuit board 23, it is introduced into the stator winding, so that a magnetic flux is formed between the stator core and the magnets of the rotor structure 32. Through alternating current, the rotor structure 32 can be driven to rotate, which in turn can drive the wheels to rotate, thereby driving the vehicle to move. In this design, the inner diameter of the first bearing 61, which rotatably connects the motor housing 1 and the stator housing 21, is set to be relatively large. This creates a radial gap between the inner side of the first bearing 61 and the shaft structure 31, providing sufficient space within this gap for the first through hole 111 and the second through hole 2111 to pass through, without the need to open through holes in the shaft structure 31. This ensures the integrity of the shaft structure 31, resulting in better strength and improved stability of the entire hub motor 100, thus extending its service life.

[0038] In one embodiment, combined with Figure 2 and Figure 3 As shown, the hub motor 100 also includes a reduction gear 4. The input end of the reduction gear 4 is connected to the shaft structure 31, and the output end of the reduction gear 4 is connected to the motor housing 1. The rotation of the rotor structure 32 drives at least a portion of the shaft structure 31 to rotate, thereby driving the reduction gear 4 to rotate, which in turn allows the motor housing 1 to rotate. The motor housing 1 is adapted to be connected to the wheel, so that the wheel can be driven to rotate through the motor housing 1, thus enabling the electric bicycle to move.

[0039] like Figure 2 As shown, the shaft structure 31 includes a first shaft 311, and a first fixed shaft 312 and a second fixed shaft 313 located at opposite ends of the first shaft 311 along its axial direction. The first fixed shaft 312 is mounted on the front sidewall of the stator housing 21, and the second fixed shaft 313 is mounted on the rear side of the motor housing 1. Preferably, the first shaft 311, the first fixed shaft 312, and the second fixed shaft 313 are coaxially arranged. The rotor structure 32 is mounted on the first shaft 311, and rotation of the rotor structure 32 can drive the first shaft 311 to rotate.

[0040] Both the first fixed shaft 312 and the second fixed shaft 313 are non-rotatable. The first fixed shaft 312 and the second fixed shaft 313 are respectively used to connect to the front fork and rear fork of the electric bicycle to fix the entire hub motor 100 to the electric bicycle. Furthermore, a cassette base assembly is provided on one side of the second fixed shaft 313. One end of the cassette base assembly is adapted to connect to the flywheel, and the other end is connected to the motor rear cover 12 via a ratchet. When the pedal is manually pressed to rotate the flywheel, the cassette base assembly can transmit the rotational power of the flywheel to the hub motor 100, thereby driving the motor housing 1 to rotate around the main shaft, driving the wheel to rotate.

[0041] The reduction gear 4 is located outside the stator housing 21 and inside the motor housing 1. Specifically, the reduction gear 4 is configured as a double planetary gear structure. The sun gear 41 of the reduction gear 4 is coaxially connected to the first shaft 311, and the internal gear ring 42 of the reduction gear 4 is connected to the motor rear cover 12.

[0042] The motor housing 1 is roughly cylindrical in shape to cover the stator housing 21 and the outside of the reduction gear 4. The motor housing 1 also forms the housing of the reduction gear 4, eliminating the need for a separate reduction housing. This results in a more compact structure and a smaller overall size of the hub motor 100.

[0043] Preferably, combined with Figure 2 and Figure 3 As shown, the motor housing 1 includes a main motor housing 11 and a rear motor cover 12 connected to the main motor housing 11. The main motor housing 11 is box-shaped and has a first opening axially along the first shaft 311 and facing rearward. The rear motor cover 12 is placed over the first opening. The rear motor cover 12 is connected to the main motor housing 11 by screws or bolts. This allows the rear motor cover 12 to be easily removed from the main motor housing 11, facilitating the assembly of the stator assembly 2, rotor assembly 3, and reduction gear 4 into the motor housing 1.

[0044] The motor main housing 11 has a front sidewall and a peripheral sidewall surrounding one side of its front sidewall. The front sidewall of the motor main housing 11 is generally flat, and the peripheral sidewall of the motor main housing 11 is annular and protrudes from the rear side of its front sidewall. When the hub motor 100 is operating normally, the first shaft 311 is arranged horizontally, and the front sidewall of the motor main housing 11 and the rear cover 12 of the motor are arranged opposite each other in the front-rear direction, with the front sidewall of the motor main housing 11 located in front of the rear cover 12. Unless otherwise specified, all descriptions of orientations in this invention shall be based on the above orientations.

[0045] The shape of the stator housing 21 matches the shape of the motor main housing 11. The stator housing 21 is also roughly cylindrical. Along the radial direction of the first shaft 311, the stator housing 21 and the motor housing 1 are spaced apart, so that the motor housing 1 is less likely to interfere with the stator housing 21 when it rotates.

[0046] Specifically, in combination Figure 2 and Figure 3 As shown, the stator housing 21 includes a stator main housing 211 and a stator rear cover 212 connected to the stator main housing 211. The stator main housing 211 is box-shaped and has a second opening axially and rearwardly disposed along the first shaft 311, with the stator rear cover 212 covering the second opening. The stator rear cover 212 can also be connected to the stator main housing 211 by screws or bolts. This makes the stator rear cover 212 easy to install and remove, thereby facilitating the installation of the stator assembly 2 and the rotor assembly 3 inside the stator main housing 211.

[0047] The stator main housing 211 also has a front sidewall and a peripheral sidewall surrounding one side of its front sidewall. The front sidewall of the stator main housing 211 is generally flat, and the peripheral sidewall of the stator main housing 211 is annular and protrudes from the rear side of its front sidewall. The front sidewall of the stator main housing 211 and the front sidewall of the motor main housing 11 are spaced apart relative to each other in the front-rear direction, and the stator rear cover 212 and the motor rear cover 12 are spaced apart relative to each other in the front-rear direction. The reduction gear 4 is disposed in the gap between the stator rear cover 212 and the motor rear cover 12.

[0048] The first bearing 61 is sleeved between the front sidewall of the motor main housing 11 and the front sidewall of the stator main housing 211. A first protruding ring is provided on the outer side of the front sidewall of the stator main housing 211, and the first bearing 61 is sleeved on the inner side of the first protruding ring. A second protruding ring is provided on the inner side of the front sidewall of the motor main housing 11, and the second protruding ring is sleeved on the inner side of the first bearing 61, so that the motor housing 1 can rotate relative to the stator housing 21.

[0049] Moreover, such as Figure 2 As shown, the rotor assembly 3 also includes a second bearing 62 and a third bearing 63 sleeved on the first shaft 311, with the second bearing 62 located in front of the third bearing 63. A third protruding ring is provided on the inner side of the front sidewall of the stator main housing 211, and the second bearing 62 is sleeved on the inner side of the third protruding ring to rotatably mount the first shaft 311 onto the stator housing 21. The reduction gear 4 is disposed near the third bearing 63 and located outside the stator housing 21. At least a portion of the first shaft 311 extends out of the stator rear cover 212 to connect with the sun gear of the reduction gear 4. Alternatively, the reduction gear 4 is provided with an input shaft, which is coaxially connected to the first shaft 311 and then connected to the sun gear.

[0050] The rotor assembly 3 also includes a fourth bearing 64 disposed on the stator housing 21. The fourth bearing 64 is sleeved on the outer side of the rotor structure 32, and the third bearing 63 is sleeved on the inner side of the rotor structure 32. Specifically, the fourth bearing 64 is disposed on the stator rear cover 212, and the third bearing 63 is located inside the fourth bearing 64 and is concentrically arranged with the fourth bearing 64, so that the other end of the first shaft 311 is rotatably disposed on the stator rear cover 212, and the rotor structure 32 is rotatably disposed on the stator rear cover 212.

[0051] Since the motor housing 1 is rotating during normal operation of the hub motor 100, the power supply wire 7 can be fitted against the shaft structure 31 so that the power supply wire 7 does not rotate along with the motor housing 1. In one embodiment, the diameter of the first through hole 111 is larger than the diameter of the second through hole 2111, and the power supply wire 7 is inserted into the second through hole 2111. Preferably, the power supply wire 7 and the second through hole 2111 are in an interference fit. The power supply wire 7 can be snapped into the second through hole 2111, while a gap is formed between it and the first through hole 111. When the motor housing 1 rotates, the power supply wire 7 will not rotate under the action of the first through hole 111, thus better ensuring the position of the power supply wire 7.

[0052] Preferably, combined with Figure 2 and Figure 3 As shown, a flange protrudes from the front end of the stator housing 21. The flange is inserted into the first through hole 111, and the second through hole 2111 extends through the flange. This allows the motor housing 1 to rotate relative to the flange, while the flange remains stationary, thus keeping the power supply wire 7 stationary as well.

[0053] The power supply cable 7 includes a power cord 71 and a connector 72 located at the end of the power cord 71. The stator circuit board 23 includes a circuit board body 231 and a connector 232 located on the circuit board body 231. At least one of the connector 72 and the connector 232 is located within a second through hole 2111, allowing the connector 72 and the connector 232 to be inserted and mated. The second through hole 2111 guides and aligns the connector 72 and the connector 232 during insertion, making the alignment smoother and enabling quick connection between the power supply cable 7 and the stator circuit board 23. This also makes inserting and removing the power supply cable 7 easier.

[0054] Furthermore, such as Figure 2As shown, the circuit board body 231 is disposed in the gap between the stator winding structure 22 and the front sidewall of the stator housing 21. The circuit board body 231 extends radially along the shaft structure 31, and both the connector 72 and the connector socket 232 are at least partially inserted into the second through hole 2111. The position of the connector socket 232 can be defined by the second through hole 2111. Therefore, when the connector 72 is inserted, on the one hand, the position of the connector 72 can be quickly defined by the second through hole 2111, and on the other hand, the alignment is more accurate when the connector 72 is inserted into the connector socket 232, avoiding misalignment and damage to the connector 72 or the connector socket 232.

[0055] Among them, combined Figure 3 and Figure 4 As shown, the connector 72 includes a connector body 721 and a plug portion 722 protruding from one side of the connector body 721. The connector body 721 is annularly arranged to fit over the outer side of the first fixed shaft 312, making the connection of the power conductor 7 more stable. Furthermore, the shape of the plug portion 722 matches the shape of the second through hole 2111, allowing the second through hole 2111 to better guide the power conductor when the plug portion 722 extends into it. The second through hole 2111 is an arc shape concentric with the first fixed shaft 312, and the plug portion 722 and the connector socket 232 are also correspondingly arc-shaped. Further, the connector body 721 is connected to the flange via screws or bolts to ensure the connection stability of the power conductor 7 and prevent it from easily detaching from the stator housing 21.

[0056] Furthermore, a first mounting portion 112 is provided on the front sidewall of the motor housing 1, which is adapted to connect with the vehicle's brake pads. The first mounting portion 112 can be configured as a first mounting hole, and there can be multiple first mounting holes. The multiple first mounting holes are distributed circumferentially along the first fixed shaft 312 to better connect and fix the brake pads.

[0057] On the orthographic projection along the axial direction of the shaft structure 31, the projection of the first mounting portion 112 is located within the projection area of ​​the inner ring side of the first bearing 61. The area of ​​the motor housing 1 located on the inner ring side of the first bearing 61 is large enough to accommodate not only the first through hole 111 but also the first mounting portion 112, thus providing sufficient connection strength for the housing inside the first bearing 61.

[0058] In one embodiment, such as Figure 2As shown, the hub motor 100 also includes a one-way clutch 5. The inner ring of the one-way clutch 5 is fitted onto the outer side of the first shaft 311, and the outer ring of the one-way clutch 5 is fitted onto the inner side of the rotor structure 32. When the stator assembly 2 is energized, it drives the rotor structure 32 to rotate, and the one-way clutch 5 is locked, allowing the rotor structure 32 to drive the first shaft 311 to rotate as well. When the stator assembly 2 is de-energized, the motor housing 1 rotates under external force (such as a user riding a pedal), which drives the internal gear ring 42 to rotate. This causes the sun gear 41 and the first shaft 311 to rotate together, triggering the one-way clutch 5 to switch to the released state. This separates the first shaft 311 from the rotor structure 32, and the rotor structure 32 remains stationary. This prevents the rotor structure 32 from rotating and causing current to form in the coils of the stator assembly 2, which could lead to the electronic components on the stator circuit board 23 becoming energized and damaged. This better protects the stator assembly 2 and the entire hub motor 100.

[0059] Specifically, when the hub motor 100 is operating normally, current flows through the windings of the stator assembly 2, forming a radial magnetic flux between the stator assembly 2 and the rotor assembly 3. This drives the stator assembly 2 to rotate at high speed, thereby rotating the first shaft 311 and the entire reduction gear 4, allowing the motor housing 1 to rotate and drive the wheel to rotate. When the hub motor 100 is de-energized, there is no current in the windings of the stator assembly 2, and no magnetic flux can be formed between the stator assembly 2 and the rotor assembly 3. At this time, the rotor assembly 3 is stationary. When the hub motor 100 is used in an electric bicycle, the user can ride by pedaling. In this case, the wheel is driven by the user, and the rotation of the wheel drives the internal gear ring 42 of the reduction gear 4 to rotate, which in turn causes the sun gear 41 to rotate, and thus the first shaft 311 connected to the sun gear 41 to rotate. At this time, since the user's riding speed is much lower than the speed when the hub motor 100 is driving, the rotation speed of the first shaft 311 is also much lower than the rotation speed of the first shaft 311 when the hub motor 100 is working normally. This allows the one-way clutch 5 to switch to the released state, so that when the first shaft 311 rotates, the rotor structure 32 is in a free state and will not rotate with the first shaft 311, so as to keep it in a stationary state and avoid reverse power generation, thus better protecting the stator assembly 2 and the entire hub motor 100.

[0060] In one embodiment, the one-way clutch 5 and the third bearing 63 are arranged side by side along the axial direction of the first shaft 311. The one-way clutch 5 and the third bearing 63 are arranged adjacent to each other, or the one-way clutch 5 and the third bearing 63 may be arranged at intervals along the axial direction of the first shaft 311.

[0061] In another embodiment, the one-way clutch 5 and the third bearing 63 are integrally formed. Integrating the one-way clutch 5 and the third bearing 63 together, sharing an inner and outer ring, effectively reduces the overall weight. Furthermore, it makes the structure of the one-way clutch 5 and the third bearing 63 more compact, occupying less space, thereby effectively reducing the axial dimension of the hub motor 100 and making the overall size of the hub motor 100 smaller.

[0062] The rotor structure 32 includes a rotor disk 321 and a rotor bushing 322 sleeved between the rotor disk 321 and the first shaft 311. A third bearing 63 and a one-way clutch 5 are both sleeved between the first shaft 311 and the rotor bushing 322. Rotation of the rotor disk 321 drives the rotor bushing 322 to rotate, and under the action of the third bearing 63 and the one-way clutch 5, the first shaft 311 can rotate as well. After long-term use, if the rotor bushing 322 wears out, it can be disassembled separately for maintenance and replacement without replacing the entire rotor structure 32, thus reducing maintenance costs. Furthermore, the rotor bushing 322 is easier to manufacture individually to better fit the one-way clutch 5 and the mounting connections of the various bearings.

[0063] Furthermore, the rotor bushing 322 has a first rotating section and a second rotating section axially connected to each other along the first shaft 311. The first rotating section is sleeved between the first shaft 311 and the rotor disk 321, the inner ring side of the second rotating section is sleeved on the outside of the third bearing 63 and the one-way clutch 5, and the outer ring side of the second rotating section is sleeved inside the third bearing 63. Both the first and second rotating sections are generally cylindrical, and the inner diameter of the first rotating section is smaller than the inner diameter of the second rotating section, so that a stepped portion is formed at the transition connection between the first and second rotating sections. The stepped portion abuts against the rear end face of the rotor disk 321, and a groove is provided on the inner side of the first rotating section, the groove being located at the front end of the first rotating section. The rotor assembly 3 also includes a locking sleeve, which is sleeved on the first shaft 311 and located within the groove. The locking sleeve and the stepped portion together restrict the axial movement of the rotor structure 32.

[0064] When the one-way clutch 5 and the third bearing 63 are integrally arranged, they can form an integrated assembly. On the radial projection along the first shaft 311, the projection of the fourth bearing 64 lies within the projection of the integrated assembly, meaning the axial thickness of the fourth bearing 64 is less than or equal to the axial thickness of the integrated assembly. Furthermore, the axial outer end face of the integrated assembly is flush with the axial outer end face of the stator housing 21, making the fourth bearing 64, the third bearing 63, and the one-way clutch 5 more compact in the axial direction, and reducing the overall axial space required.

[0065] This utility model also provides an electric bicycle, including the above-mentioned hub motor 100. The power supply wire 7 of the hub motor 100 is easier to connect, and the hub motor 100 has better strength and more stable operation, making the electric bicycle ride more stably.

[0066] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structure made using the contents of the present utility model specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A hub motor, characterized in that, include: The motor housing has a first through hole at its front end; The stator assembly includes a stator housing disposed within the motor housing, a stator winding structure disposed within the stator housing, and a stator circuit board electrically connected to the stator winding structure. The stator housing is provided with a second through hole that communicates with the first through hole. The rotor assembly includes a first bearing, a shaft structure, and a rotor structure disposed on the shaft structure. The first bearing is rotatably connected to the motor housing and the stator housing. The shaft structure passes through the stator housing and is coaxially arranged with the first bearing. The stator winding structure surrounds the outer periphery of the rotor structure. Along the radial direction of the shaft structure, the inner ring side of the first bearing and the shaft structure are spaced apart; the first through hole and the second through hole are both circumferentially disposed on the outer periphery of the shaft structure and are both located within the gap between the first bearing and the shaft structure; The power supply wire passes through the first and second through holes into the stator housing and is electrically connected to the stator circuit board.

2. The hub motor as described in claim 1, characterized in that, The diameter of the first via is larger than the diameter of the second via, and the power supply wire is inserted into and connected to the second via.

3. The hub motor as described in claim 1, characterized in that, The stator housing has a flange protruding from its front end, the flange being inserted into the first through hole, and the second through hole being provided to penetrate the flange; The power supply conductor includes a power line and a connector plug located at the end of the power line; the stator circuit board includes a circuit board body and a connector socket located on the circuit board body, wherein at least one of the connector plug and the connector socket is located within the second through hole, such that the connector plug and the connector socket are plugged into each other.

4. The hub motor as described in claim 3, characterized in that, The circuit board body is disposed in the gap between the stator winding structure and the front sidewall of the stator housing, and the circuit board body extends radially along the shaft structure; the conductive plug and the conductive socket are both at least partially inserted into the second through hole.

5. The hub motor as described in claim 1, characterized in that, A first protruding ring protrudes from the outer side of the front sidewall of the stator housing, and a second protruding ring protrudes from the inner side of the front sidewall of the motor housing. The first bearing is sleeved between the first protruding ring and the second protruding ring to rotatably connect the motor housing and the stator housing.

6. The hub motor as described in claim 1, characterized in that, The front sidewall of the motor housing is provided with a first mounting part, which is adapted to be connected to the brake pad of the vehicle. In the orthogonal projection along the axial direction of the shaft structure, the projection of the first mounting part is located in the projection area of ​​the inner ring side of the first bearing.

7. The hub motor as described in claim 3, characterized in that, The shaft structure includes a first shaft, and a first fixed shaft and a second fixed shaft located at both ends of the first shaft along its axial direction. The first fixed shaft is located on the front side wall of the stator housing, and the second fixed shaft is located on the rear side of the motor housing. The rotor structure is mounted on the first shaft. The rotation of the rotor structure can drive the first shaft to rotate. Both the first fixed shaft and the second fixed shaft are non-rotating.

8. The hub motor as described in claim 7, characterized in that, The hub motor further includes a one-way clutch, wherein the inner ring of the one-way clutch is sleeved on the outer side of the first shaft, and the outer ring of the one-way clutch is sleeved on the inner side of the rotor structure; and / or, The connector includes a plug body and a plug portion protruding from one side of the plug body. The plug body is arranged in a ring shape to be fitted onto the outside of the first fixed shaft. The shape of the plug portion matches the shape of the second through hole.

9. The hub motor as described in claim 8, characterized in that, The rotor assembly further includes a second bearing and a third bearing sleeved on the first shaft, the second bearing being mounted on the stator housing, and the third bearing being sleeved on the inner side of the rotor structure; The third bearing and the one-way clutch are arranged side by side along the axial direction of the first shaft; or, the third bearing and the one-way clutch are integrated into one piece.

10. An electric bicycle, characterized in that, Including the hub motor as described in any one of claims 1 to 9.

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