A hub motor and a power-assisted bicycle applying the same

Abstract

The application discloses a hub motor and a power-assisted bicycle applying the same, and belongs to the technical field of motors, and solves the problems of large volume and heavy weight of the existing hub motor. The hub motor is used for a power-assisted bicycle, and comprises a shell body, a motor assembly arranged in the shell body, a speed reducer and a one-way clutch. The motor assembly is connected with the speed reducer, the speed reducer is connected with the one-way clutch, and the shell body is connected with the hub of the power-assisted bicycle. In use, the motor assembly sequentially transmits power to the speed reducer and the one-way clutch, the one-way clutch transmits the power to the shell body, and the shell body drives the hub of the power-assisted bicycle to rotate. The hub motor has the advantages that the motor assembly, the speed reducer and the one-way clutch are sequentially assembled in the hub motor, the volume of the hub motor is reduced, the weight of the hub motor is reduced, the hub motor is more portable under the condition that the power of the power-assisted bicycle is unchanged, and the whole machine is more portable.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a hub motor and an electric bicycle using the same. Background Technology

[0002] With the rapid development of new energy transportation tools such as electric-assist bicycles, there are higher requirements for drive motors that are efficient, compact, and adaptable to the needs of different vehicles. Traditional hub motors not only have disadvantages such as large size, heavy weight, and low transmission efficiency, but also make it difficult to meet the demands of high-end road bike users for products that are "small in size," "lightweight," and "intelligent." Summary of the Invention

[0003] The purpose of this invention is to provide a hub motor and an electric bicycle using the same, which solves the problems of large size and heavy weight of existing hub motors.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A hub motor for power-assisted bicycles includes a housing and a motor assembly, a reducer, and a one-way clutch disposed within the housing. The motor assembly is connected to the reducer, the reducer is connected to the one-way clutch, and the housing is connected to the hub of the power-assisted bicycle. In use, the motor assembly transmits power sequentially to the reducer and the one-way clutch, and the one-way clutch transmits power to the housing, causing the housing to rotate the hub of the power-assisted bicycle.

[0006] In some embodiments, the hub motor further includes a freehub, one end of which is connected to the one-way clutch and the other end of which is connected to the flywheel of the electric bicycle.

[0007] In some embodiments, the other end of the base is connected to the pedals of the electric bicycle via the flywheel of the electric bicycle.

[0008] In some embodiments, the motor assembly is cantilevered to the reducer, and the motor assembly transmits torque to the reducer for speed change.

[0009] In some embodiments, the reducer is movably connected to the one-way clutch.

[0010] In some embodiments, the one-way clutch is used to transmit and disconnect power between the reducer and the tower base.

[0011] In some embodiments, the motor assembly includes a housing body, a stator unit, and a rotor unit, wherein the stator unit and the rotor unit are both disposed inside the housing body, the stator unit is sleeved on the outer periphery of the rotor unit, and the rotor unit is connected to the reducer.

[0012] In some embodiments, the reducer includes a first planetary gear train, a second planetary gear train, and a frame. One end of the first planetary gear train is connected to the motor assembly, the other end of the first planetary gear train is connected to one side of the frame, the other side of the frame is connected to the second planetary gear train, and the second planetary gear train is connected to the one-way clutch.

[0013] In some embodiments, the one-way clutch includes an outer ring and a cage, the outer ring being disposed on the cage and rotating in one direction relative to the cage, the outer ring being connected to the reducer, and the end of the cage away from the outer ring being connected to the base.

[0014] Another technical solution of the present invention is implemented as follows:

[0015] An electric bicycle includes a hub motor, a hub, a flywheel, pedals, and a frame body. The hub motor is connected to the hub and the hub motor is connected to the pedals via the flywheel. The hub motor, the hub, the flywheel, and the pedals are all mounted on the frame body.

[0016] Compared with the prior art, the hub motor in this invention has a smaller size and lighter weight due to the sequential assembly of the internal motor components, reducer and one-way clutch. This makes the hub motor more portable while maintaining the same power of the electric bicycle, thus making the whole machine more portable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a hub motor provided in Embodiment 1 of the present invention;

[0018] Figure 2 This is another structural schematic diagram of a hub motor provided in Embodiment 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of a motor assembly in a hub motor according to Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of a reducer in a hub motor according to Embodiment 1 of the present invention;

[0021] Figure 5 This is another structural schematic diagram of a reducer in a hub motor provided in Embodiment 1 of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of a one-way clutch in a hub motor provided in Embodiment 1 of the present invention.

[0023] In the figure, 1. Motor assembly, 11. Housing body, 12. Stator unit, 13. Rotor unit, 2. Reducer, 21. First planetary gear train, 22. Second planetary gear train, 23. Frame, 3. One-way clutch, 31. Outer ring, 32. Cage, 4. Housing body, 5. Tower base. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] In the description of this invention, it should be clarified that the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," and "horizontal," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are merely for the convenience of describing this invention. They do not imply that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example 1

[0027] Embodiment 1 of the present invention provides a hub motor, such as Figure 1 and Figure 2 As shown, the bicycle includes an outer casing and a motor assembly 1, a reducer 2, and a one-way clutch 3 disposed within the outer casing. The motor assembly 1 is connected to the reducer 2, and the reducer 2 is connected to the one-way clutch 3. The outer casing 4 is connected to the wheel hub of the electric bicycle. In use, the motor assembly 1 transmits power sequentially to the reducer 2 and the one-way clutch 3, and the one-way clutch 3 transmits power to the outer casing 4, which in turn drives the wheel hub of the electric bicycle to rotate.

[0028] With the above solution, when the hub motor is used in a power-assisted bicycle, the motor assembly 1, reducer 2, and one-way clutch 3 are assembled sequentially. The torque transmission path of the motor assembly 1 is sequentially from the motor assembly 1 to the reducer 2 and then to the one-way clutch 3. The one-way clutch 3 transmits power to the outer casing 4, which then transmits the power to the wheel hub. Because the internal motor assembly 1, reducer 2, and one-way clutch 3 are assembled sequentially, the hub motor's size and weight are reduced, making it more portable while maintaining the same power output of the power-assisted bicycle, thus making the entire machine more portable.

[0029] Furthermore, the outer shell 4 adopts a straight-pull hub shell, which is connected to the straight-pull spokes. The straight-pull spokes are connected to the hub of the electric bicycle to transmit power.

[0030] Furthermore, carbon steel rims can be used for the wheels.

[0031] In the specific implementation process of this embodiment 1, such as Figure 1 and Figure 2 As shown, the hub motor also includes a freewheel base 5, one end of which is connected to the one-way clutch 3, and the other end of which is connected to the flywheel of the electric bicycle.

[0032] More specifically, the freehub base 5 is used to transmit torque from the flywheel. During riding, when the motor assembly 1 stops running, the user inevitably needs to pedal. During pedaling, the power between the motor assembly 1 and the freehub base 5 needs to be disconnected, so a one-way clutch 3 is required to rotate in one direction.

[0033] In the specific implementation of this embodiment 1, the other end of the tower base 5 is connected to the pedals of the electric bicycle via the flywheel of the electric bicycle.

[0034] More specifically, during the ride, when the motor assembly 1 stops running, the user inevitably needs to pedal. When the user pedals, the pedal transmits power to the flywheel and then to the freehub base 5. The freehub base 5 further transmits power to the outer casing 4, and the outer casing 4 drives the wheel hub to rotate.

[0035] Furthermore, a torque sensor is installed on the freehub base 5 to transmit signals when the user pedals, resulting in faster signal transmission. Conventional freehub bases without torque sensors usually require power meters and cadence meters to measure the user's output power and cadence. By installing a torque sensor, power meters and cadence meters can be replaced, which not only saves components but also allows for faster signal transmission.

[0036] In the specific implementation process of this embodiment 1, such as Figure 2As shown, the motor assembly 1 is cantilevered to the reducer 2, and the motor assembly 1 transmits torque to the reducer 2 for speed change.

[0037] More specifically, the motor assembly 1 is cantilevered with the reducer 2, and the rotor unit 13 of the motor assembly 1 is cantilevered with the first planetary gear train 21 of the reducer 2. It can be connected by a stop, snap-fit, slot or other connection method, which can not only play the role of connection but also play the role of torque transmission. This design makes the hub motor mechanism more compact and lightweight.

[0038] In the specific implementation process of this embodiment 1, such as Figure 2 As shown, the reducer 2 is movably connected to the one-way clutch 3.

[0039] More specifically, the reducer 2 is movably connected to the one-way clutch 3, using a stop, snap-fit, slot or other connection method, which not only serves as a connection but also transmits torque. This design makes the hub motor mechanism more compact and lightweight.

[0040] In the specific implementation process of this embodiment 1, the one-way clutch 3 is used to transmit and disconnect the power between the reducer 2 and the tower base 5.

[0041] More specifically, when the user needs the motor assembly 1 to assist, the motor assembly 1 sequentially transmits power to the reducer 2, and the one-way clutch 3 rotates in one direction to transmit power to the outer casing 4, which in turn drives the wheel hub to rotate. During the ride, when the motor assembly 1 stops running, the user inevitably needs to pedal. During pedaling, the one-way clutch 3 does not rotate, disconnecting the power between the motor assembly 1 and the freehub base 5. At this time, the power of the user's pedaling is transmitted to the freehub base 5 and then to the wheel hub.

[0042] In the specific implementation process of this embodiment 1, such as Figure 3 As shown, the motor assembly 1 includes a housing body 11, a stator unit 12 and a rotor unit 13. The stator unit 12 and the rotor unit 13 are both located inside the housing body 11. The stator unit 12 is sleeved on the outer periphery of the rotor unit 13. The rotor unit 13 is connected to the reducer 2.

[0043] More specifically, the motor assembly 1 is applied to a hub motor, and the housing body 11 is cantilevered to the reducer 2. In use, the housing body 11 is cantilevered to the reducer 2, which is convenient to assemble and has a small size. The stator unit 12 drives the rotor unit 13 to rotate, and the rotor unit 13 drives the reducer 2 to rotate, thereby driving the hub motor to rotate. The hub motor transmits power to the hub.

[0044] In the specific implementation process of this embodiment 1, such as Figure 4 and Figure 5 As shown, the reducer 2 includes a first planetary gear train 21, a second planetary gear train 22, and a frame 23. One end of the first planetary gear train 21 is connected to the motor assembly 1, and the other end of the first planetary gear train 21 is connected to one side of the frame 23. The other side of the frame 23 is connected to the second planetary gear train 22, and the second planetary gear train 22 is connected to the one-way clutch 3.

[0045] More specifically, the reducer 2 is placed in the hub motor. The motor assembly 1 transmits power to the first planetary gear train 21 for first-stage reduction, and the frame 23 transmits the power after first-stage reduction to the second planetary gear train 22 for second-stage reduction. The reducer improves the reduction ratio through two-stage reduction, which increases the adaptability of the reducer 2 when it is applied to the hub motor.

[0046] Furthermore, traditional multi-stage transmission reduction often uses multiple planetary carriers, while this reducer achieves two-stage reduction by setting a carrier 23 and placing the first planetary gear train 21 and the second planetary gear train 22 on both sides of the carrier 23, which simplifies the mechanism and makes the reducer 2 smaller and the transmission structure more compact.

[0047] In the specific implementation process of this embodiment 1, such as Figure 6 As shown, the one-way clutch 3 includes an outer ring 31 and a retainer 32. The outer ring 31 is disposed on the retainer 32 and rotates in one direction relative to the retainer 32. The outer ring 31 is connected to the reducer 2, and the end of the retainer 32 away from the outer ring 31 is connected to the tower base 5.

[0048] More specifically, the one-way clutch 3 is used in a hub motor. When in use, the motor assembly 1 transmits power to the outer ring 31, which rotates in one direction relative to the cage 32, and transmits power to the outer casing 4. When a person pedals, the freehub 5 drives the cage 32 to rotate, while the outer ring 31 does not rotate, thus disconnecting the torque between the freehub 5 and the motor assembly 1. The outer ring 31 does not rotate, making it easier for the user to pedal.

[0049] The workflow provided in Embodiment 1 of this invention is as follows: The motor assembly 1 is cantilevered with the reducer 2. The reducer 2, by setting a first planetary gear train 21 and a second planetary gear train 22, can achieve a larger transmission ratio and optimal transmission noise. The reducer 2 transmits the torque after reduction and torque increase to the one-way clutch 3. The one-way clutch 3 transmits power to the outer casing 4. The outer casing 4 drives the wheel hub to rotate. When the motor stops running, the user pedals. During the pedaling process, it is necessary to disconnect the power between the motor assembly 1 and the base 5. Therefore, a one-way clutch 3 is required to rotate in one direction. This application, through the cooperation of the internal parts of the wheel hub motor, transmits torque to the outer casing 4. The outer casing 4 transmits power to the wheel hub, which has the advantages of simple installation, simple structure, and light weight.

[0050] Example 2

[0051] The present invention provides an electric bicycle in embodiment 2, comprising a hub motor, a hub, a flywheel, pedals and a frame body as described in embodiment 1. The hub motor is connected to the hub and the hub motor is connected to the pedals through the flywheel. The hub motor, the hub, the flywheel and the pedals are all disposed on the frame body.

[0052] With the above solution, the hub motor is used in the power-assisted bicycle, which is more labor-saving and lighter to ride.

[0053] In summary, when this hub motor is used in a power-assisted bicycle, the motor assembly 1, reducer 2, and one-way clutch 3 are assembled sequentially. The torque transmission path of the motor assembly 1 is sequentially from the motor assembly 1 to the reducer 2 and then to the one-way clutch 3. The one-way clutch 3 transmits power to the outer casing 4, which then transmits the power to the wheel hub. Because the internal motor assembly 1, reducer 2, and one-way clutch 3 are assembled sequentially, the hub motor's size and weight are reduced, making it more portable while maintaining the same power output of the power-assisted bicycle, thus making the entire device more portable.

[0054] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hub motor for use in a power-assisted bicycle, characterized in that, The device includes an outer casing (4) and a motor assembly (1), a reducer (2), and a one-way clutch (3) disposed within the outer casing (4). The motor assembly (1) is connected to the reducer (2), the reducer (2) is connected to the one-way clutch (3), and the outer casing (4) is connected to the wheel hub of the electric bicycle. In use, the motor assembly (1) transmits power sequentially to the reducer (2) and the one-way clutch (3), and the one-way clutch (3) transmits power to the outer casing (4). The outer casing (4) drives the wheel hub of the electric bicycle to rotate.

2. The hub motor according to claim 1, characterized in that, The hub motor also includes a freewheel base (5), one end of which is connected to the one-way clutch (3), and the other end of which is connected to the flywheel of the electric bicycle.

3. The hub motor according to claim 2, characterized in that, The other end of the tower base (5) is connected to the pedals of the electric bicycle via the flywheel of the electric bicycle.

4. The hub motor according to any one of claims 1-3, characterized in that, The motor assembly (1) is cantilevered to the reducer (2), and the motor assembly (1) transmits torque to the reducer (2) for speed change.

5. The hub motor according to claim 4, characterized in that, The reducer (2) is movably connected to the one-way clutch (3).

6. The hub motor according to claim 3, characterized in that, The one-way clutch (3) is used to transmit and disconnect the power between the reducer (2) and the tower base (5).

7. The hub motor according to any one of claims 1-3, characterized in that, The motor assembly (1) includes a housing body (11), a stator unit (12) and a rotor unit (13). The stator unit (12) and the rotor unit (13) are both located inside the housing body (11). The stator unit (12) is sleeved on the outer periphery of the rotor unit (13). The rotor unit (13) is connected to the reducer (2).

8. The hub motor according to any one of claims 1-3, characterized in that, The reducer (2) includes a first planetary gear train (21), a second planetary gear train (22), and a frame (23). One end of the first planetary gear train (21) is connected to the motor assembly (1), and the other end of the first planetary gear train (21) is connected to one side of the frame (23). The other side of the frame (23) is connected to the second planetary gear train (22), and the second planetary gear train (22) is connected to the one-way clutch (3).

9. The hub motor according to claim 2 or 3, characterized in that, The one-way clutch (3) includes an outer ring (31) and a retainer (32). The outer ring (31) is disposed on the retainer (32) and rotates in one direction relative to the retainer (32). The outer ring (31) is connected to the reducer (2). The end of the retainer (32) away from the outer ring (31) is connected to the tower base (5).

10. A power-assisted bicycle, characterized in that, The vehicle includes a hub motor, a hub, a flywheel, a pedal, and a frame body as described in any one of claims 1-9, wherein the hub motor is connected to the hub, the hub motor is connected to the pedal via the flywheel, and the hub motor, the hub, the flywheel, and the pedal are all mounted on the frame body.

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