A hub motor of an electric moped and the electric moped

Abstract

This utility model belongs to the field of electric-assisted bicycle technology, and discloses a hub motor for an electric-assisted bicycle and the bicycle itself. The hub motor includes an outer hub, a motor side cover, a motor shaft, a stator assembly, a rotor assembly, a heat-conducting sleeve, and a heat sink. The outer hub and the motor side cover are connected to define a motor cavity. The motor shaft passes through the motor cavity, the stator assembly is installed in the motor cavity and sleeved on the motor shaft, and the rotor assembly is rotatably sleeved on the motor shaft. One end of the heat-conducting sleeve abuts against and is connected to the stator assembly; the other end of the heat-conducting sleeve is flush with the end face of the motor side cover facing away from the outer hub. The heat sink is sleeved on the motor shaft, and one end of the heat sink is connected to the other end of the heat-conducting sleeve. This hub motor achieves efficient heat dissipation from the inside to the outside, effectively reducing the temperature rise of the hub motor, improving its reliability and service life, and contributing to improved operational reliability and extended range of the electric-assisted bicycle.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, and in particular to a hub motor for an electric bicycle and an electric bicycle. Background Technology

[0002] The heat dissipation capacity of the hub motor in an electric bicycle is a crucial indicator affecting its normal operation. In actual operation, if the heat generated by the hub motor cannot be dissipated in time, it will cause a series of serious problems, such as decreased motor efficiency, demagnetization of permanent magnets, degradation of material properties and shortened lifespan. Poor thermal management directly threatens the performance, reliability and lifespan of the motor, thereby affecting the reliability and range of the electric bicycle.

[0003] Therefore, there is an urgent need to develop a hub motor for electric bicycles with better heat dissipation capabilities and higher heat dissipation efficiency to improve the operational reliability of electric bicycles and ensure their driving range. Utility Model Content

[0004] One aspect of this utility model provides a hub motor for an electric-assisted bicycle. This hub motor has good heat dissipation capacity and high heat dissipation efficiency, which is beneficial to improving the working reliability of the electric-assisted bicycle and ensuring its driving range.

[0005] Another aspect of this utility model provides an electric-assisted bicycle with good working reliability, long driving range, and high user satisfaction.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model discloses a hub motor for an electric-assisted bicycle, comprising: an outer hub and a motor side cover, the outer hub and the motor side cover being connected to define a motor cavity; a motor shaft passing through the motor cavity; a stator assembly mounted in the motor cavity and sleeved on the motor shaft; a rotor assembly rotatably sleeved on the motor shaft; a heat-conducting sleeve sleeved on the motor shaft, one end of the heat-conducting sleeve abutting against and connected to the stator assembly; the other end of the heat-conducting sleeve being flush with the end face of the motor side cover opposite to the outer hub; and a heat sink sleeved on the motor shaft, one end of the heat sink being connected to the other end of the heat-conducting sleeve.

[0008] In some embodiments, thermal grease is applied to one end of the thermally conductive sleeve facing the stator assembly.

[0009] In some embodiments, the stator assembly is provided with a first fixing hole, the heat-conducting sleeve is provided with a second fixing hole, and a first fixing member passes through the first fixing hole and is connected to the second fixing hole to fix the heat-conducting sleeve on the stator assembly.

[0010] In some embodiments, the central hole of the heat-conducting sleeve is a stepped hole, the stepped hole has a first stepped surface, the motor shaft has a second stepped surface, and a sealing element is provided on the motor shaft, with the two opposite sides of the sealing element abutting against the first stepped surface and the second stepped surface, respectively.

[0011] In some embodiments, the hub motor of the electric-assisted bicycle further includes a connecting sleeve, which is fitted onto the heat-conducting sleeve, and a bearing is provided between the connecting sleeve and the motor side cover.

[0012] In some specific embodiments, an oil seal is also provided between the motor side cover and the connecting sleeve, and the oil seal is located on the side of the bearing opposite to the stator assembly.

[0013] In some embodiments, the heat-conducting sleeve includes a sleeve portion and a connecting plate connected to one end of the sleeve portion. The connecting plate is used to connect to the stator assembly, and the end face of the sleeve portion opposite to the connecting plate abuts against the heat sink.

[0014] In some embodiments, the heat sink is provided with a third fixing hole, the heat-conducting sleeve is provided with a fourth fixing hole, and the second fixing member passes through the third fixing hole and is connected to the fourth fixing hole to fix the heat sink on the heat-conducting sleeve.

[0015] In some embodiments, the heat sink has a plurality of spaced heat dissipation fins on the side opposite to the heat-conducting sleeve.

[0016] This utility model discloses an electric-assisted bicycle, including a body, wheels, and a hub motor of the electric-assisted bicycle as described above, wherein the hub motor of the electric-assisted bicycle is mounted on the wheels.

[0017] The beneficial effects of the hub motor of this electric-assisted bicycle are as follows: A heat-conducting sleeve is fitted onto the motor shaft, with one end of the heat-conducting sleeve abutting against and connected to the stator assembly. A heat sink is fitted onto the motor shaft, with one end of the heat sink connected to the other end of the heat-conducting sleeve. In actual operation, the heat inside the hub motor is transferred to the heat-conducting sleeve through the stator assembly, and then transferred to the heat sink by the heat-conducting sleeve, and finally dissipated into the external environment. This achieves efficient heat dissipation from the inside of the hub motor to the outside of the hub motor, effectively reducing the temperature rise of the hub motor, improving the reliability of the hub motor, extending the service life of the hub motor, and contributing to improving the working reliability of the electric-assisted bicycle and ensuring the range of the electric-assisted bicycle.

[0018] The beneficial effects of this electric-assisted bicycle are as follows: due to the presence of the hub motor described above, the electric-assisted bicycle has good working reliability, a long driving range, and high user satisfaction.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the hub motor of the electric-assisted bicycle according to an embodiment of the present invention;

[0021] Figure 2 This is an exploded view of the hub motor of the electric-assisted bicycle according to an embodiment of the present invention.

[0022] Figure label:

[0023] 1. Outer hub; 101. Sixth fixing hole; 2. Motor side cover; 201. Fifth fixing hole; 3. Motor shaft; 4. Stator assembly; 401. First fixing hole; 5. Rotor assembly; 6. Heat-conducting sleeve; 601. Connecting plate; 6011. Second fixing hole; 602. Sleeve part; 6021. Fourth fixing hole; 7. Heat sink; 701. Third fixing hole; 702. Heat sink fins; 8. Seal; 9. Connecting sleeve; 10. Oil seal; 11. First fixing component; 12. Second fixing component; 13. Third fixing component; 14. Bearing. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] This utility model discloses a hub motor for an electric bicycle (hereinafter referred to as hub motor for ease of description), see reference. Figures 1-2 As shown, the hub motor includes an outer hub 1, a motor side cover 2, a motor shaft 3, a stator assembly 4, a rotor assembly 5, a heat-conducting sleeve 6, and a heat sink 7. The outer hub 1 and the motor side cover 2 are connected to define the motor cavity. The motor shaft 3 passes through the motor cavity. The stator assembly 4 is installed in the motor cavity and sleeved on the motor shaft 3. The rotor assembly 5 is rotatably sleeved on the motor shaft 3. The heat-conducting sleeve 6 is sleeved on the motor shaft 3. One end of the heat-conducting sleeve 6 abuts against the stator assembly 4 and is connected to the stator assembly 4. The other end of the heat-conducting sleeve 6 is flush with the end face of the motor side cover 2 away from the outer hub 1. The heat sink 7 is sleeved on the motor shaft 3. One end of the heat sink 7 is connected to the other end of the heat-conducting sleeve 6. Understandably, when the heat-conducting sleeve 6 is fitted onto the motor shaft 3, with one end of the heat-conducting sleeve 6 abutting against and connected to the stator assembly 4, and the heat sink 7 is fitted onto the motor shaft 3, with one end of the heat sink 7 connected to the other end of the heat-conducting sleeve 6, in actual operation, the heat inside the hub motor is transferred to the heat-conducting sleeve 6 through the stator assembly 4, and then transferred from the heat-conducting sleeve 6 to the heat sink 7, and finally dissipated into the external environment. This achieves efficient heat dissipation from the hub motor to the outside of the hub motor, effectively reducing the temperature rise of the hub motor, improving the reliability of the hub motor, extending the service life of the hub motor, and is conducive to improving the working reliability of the electric-assisted bicycle and ensuring the range of the electric-assisted bicycle.

[0028] Optionally, the end of the heat-conducting sleeve 6 facing the stator assembly 4 is coated with thermally conductive silicone grease. It is understood that the application of thermally conductive silicone grease between the heat-conducting sleeve 6 and the stator assembly 4 allows the heat generated by the stator assembly 4 during operation to be quickly transferred to the heat-conducting sleeve 6, and then from the heat-conducting sleeve 6 to the heat sink 7, ultimately dissipating into the external environment. The added thermally conductive silicone grease helps improve heat transfer efficiency, thereby enhancing the heat dissipation capacity of the contour motor. Of course, it should be noted that in other embodiments of this invention, other thermally conductive coatings may be applied between the heat-conducting sleeve 6 and the stator assembly 4, and are not limited to thermally conductive silicone grease.

[0029] Optionally, the heat-conducting sleeve 6 is made of aluminum, and the heat sink 7 is made of aluminum, which helps to improve the heat dissipation capacity of the contour motor. Of course, in other embodiments of this utility model, the materials of the heat-conducting sleeve 6 and the heat sink 7 can be selected from other materials according to actual needs, and are not limited to the above limitations.

[0030] Optionally, the heat-conducting sleeve 6 and the motor shaft 3 can be fitted with a small clearance of H7 / g6 to ensure the concentricity requirement of the assembly between the two.

[0031] Optional, see reference Figure 1 As shown, the stator assembly 4 has a first fixing hole 401, and the heat-conducting sleeve 6 has a second fixing hole 6011. The first fixing member 11 passes through the first fixing hole 401 and connects to the second fixing hole 6011 to fix the heat-conducting sleeve 6 to the stator assembly 4. It can be understood that in the actual assembly process, it is only necessary to attach the heat-conducting sleeve 6 to the end face of the stator assembly 4, aligning the first fixing hole 401 and the second fixing hole 6011, and connecting the first fixing member 11 through the first fixing hole 401 and the second fixing hole 6011 to complete the fixation of the heat-conducting sleeve 6 to the stator assembly 4. This connection method can conveniently ensure the connection stability of the heat-conducting sleeve 6 and facilitate its installation and removal. Optionally, there may be multiple first fixing holes 401, second fixing holes 6011, and first fixing members 11, thereby further ensuring the connection stability of the heat-conducting sleeve 6. In embodiments of this utility model, the first fixing member 11 can be selected from structures such as screws, pins, and rivets according to actual needs, and the specific type of the first fixing member 11 is not limited here. In addition, during the actual connection process, the stator assembly 4 and the heat-conducting sleeve 6 can also be fixed by other methods such as welding, bonding, or snap-fit ​​connection.

[0032] Optionally, the central hole of the heat-conducting sleeve 6 is a stepped hole with a first stepped surface, and the motor shaft 3 has a second stepped surface. A sealing element 8 is installed on the motor shaft 3, with its opposite sides abutting against the first and second stepped surfaces, respectively. Understandably, during actual installation, the sealing element 8 is fitted onto the motor shaft 3 and abuts against the second stepped surface. Then, the heat-conducting sleeve 6 tightly presses the sealing element 8 between the first and second stepped surfaces, ensuring a reliable seal between them. This reduces the entry of external contaminants into the hub motor through the gap between the heat-conducting sleeve 6 and the motor shaft 3.

[0033] Alternatively, before the heat-conducting sleeve 6 is installed into the motor shaft 3, sealing silicone can be applied to the inner circle side of the heat-conducting sleeve 6 to achieve a double seal with the seal 8, so as to achieve a tight fit and efficient sealing between the two.

[0034] refer to Figures 1-2As shown, the hub motor of the electric-assisted bicycle also includes a connecting sleeve 9, which is fitted onto the heat-conducting sleeve 6, and a bearing 14 is provided between the connecting sleeve 9 and the motor side cover 2. It can be understood that by providing the connecting sleeve 9 to support the bearing 14, the heat-conducting sleeve 6 does not directly contact the motor side cover 2. When the motor side cover 2 rotates together with the outer hub 1, the heat-conducting sleeve 6 will not be subjected to friction, which helps to improve the service life of the heat-conducting sleeve 6, thereby ensuring the heat dissipation capacity of the entire hub motor.

[0035] Optionally, the connecting sleeve 9 and the heat-conducting sleeve 6 can be press-fitted together, or they can be integrally die-cast.

[0036] Optionally, the surface roughness accuracy of the outer edge of the connecting sleeve 9 shall not be lower than Ra0.8.

[0037] Optionally, an oil seal 10 is also provided between the motor side cover 2 and the connecting sleeve 9. The oil seal 10 is located on the side of the bearing 14 opposite to the stator assembly 4. It is understood that the added oil seal 10 can seal the mating gap between the motor side cover 2 and the connecting sleeve 9, reducing the probability of external contaminants entering the hub motor, thereby improving the reliability of the hub motor.

[0038] Optional, see reference Figure 2 As shown, the heat-conducting sleeve 6 includes a sleeve portion 602 and a connecting plate 601 connected to one end of the sleeve portion 602. The connecting plate 601 is used to connect to the stator assembly 4, and the end face of the sleeve portion 602 facing away from the connecting plate 601 abuts against the heat dissipation plate 7. It can be understood that by connecting to the stator assembly 4 through the larger connecting plate 601, the contact area between the heat-conducting sleeve 6 and the stator assembly 4 can be increased, thereby facilitating the transfer of heat from the stator assembly 4 to the heat-conducting sleeve 6 and ensuring the heat dissipation capacity of the entire hub motor.

[0039] Optionally, the heat sink 7 has a third fixing hole 701, and the heat-conducting sleeve 6 has a fourth fixing hole 6021. The second fixing member 12 passes through the third fixing hole 701 and connects to the fourth fixing hole 6021 to fix the heat sink 7 to the heat-conducting sleeve 6. Understandably, in the actual assembly process, it is only necessary to place the heat sink 7 against the end face of the heat-conducting sleeve 6, aligning the third fixing hole 701 and the fourth fixing hole 6021, and connect the second fixing member 12 through the third fixing hole 701 and the fourth fixing hole 6021 to complete the fixation of the heat sink 7 to the heat-conducting sleeve 6. This connection method can conveniently ensure the connection stability of the heat sink 7 and facilitate the installation and removal of the heat sink 7. Further optionally, there are multiple third fixing holes 701, fourth fixing holes 6021, and second fixing members 12, thereby further ensuring the connection stability of the heat sink 7. In embodiments of this utility model, the second fixing member 12 can be selected from structures such as screws, pins, and rivets according to actual needs, and the specific type of the second fixing member 12 is not limited here. In addition, during the actual connection process, the heat sink 7 and the heat-conducting sleeve 6 can also be fixed by other methods such as welding, bonding, or snap-fit ​​connection.

[0040] Optionally, the motor side cover 2 is provided with a fifth fixing hole 201, and the outer hub 1 is provided with a sixth fixing hole 101. The third fixing member 13 passes through the fifth fixing hole 201 and connects with the sixth fixing hole 101 to fix the motor side cover 2 to the outer hub 1. Understandably, in the actual assembly process, it is only necessary to attach the motor side cover 2 to the end face of the outer hub 1, aligning the fifth fixing hole 201 and the sixth fixing hole 101, and connecting the third fixing member 13 through the fifth fixing hole 201 to the sixth fixing hole 101 to complete the fixing of the motor side cover 2 to the outer hub 1. This connection method can conveniently ensure the connection stability of the motor side cover 2 and facilitate the installation and removal of the motor side cover 2. Further optionally, there are multiple fifth fixing holes 201, sixth fixing holes 101, and third fixing members 13, thereby further ensuring the connection stability of the motor side cover 2. In embodiments of this utility model, the third fixing member 13 can be selected from structures such as screws, pins, and rivets according to actual needs, and the specific type of the third fixing member 13 is not limited here. In addition, during the actual connection process, the motor side cover 2 and the outer hub 1 can also be fixed by other methods such as snap-fit ​​connection.

[0041] refer to Figures 1-2As shown, the heat sink 7 has multiple spaced-apart heat dissipation fins 702 on the side opposite to the heat-conducting sleeve 6. It can be understood that the evenly distributed strip-shaped heat dissipation fins 702 on the surface of the heat sink 7 can increase the heat dissipation area and volume of the heat sink 7, achieving efficient heat dissipation. It should be noted that the structure of the heat dissipation fins 702 can be selected according to actual needs, and the structure of the heat dissipation fins 702 is not limited here. The structure of the heat sink 7 can be circular or U-shaped, and other structural forms can be selected according to actual needs.

[0042] This utility model discloses an electric-assisted bicycle, including a body, wheels, and a hub motor mounted on the wheels. Due to the presence of the hub motor, this electric-assisted bicycle has good operational reliability, a long driving range, and high user satisfaction.

[0043] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A hub motor for an electric-assisted bicycle, characterized in that, include: An outer hub (1) and a motor side cover (2) are connected to define a motor cavity; Motor shaft (3), the motor shaft (3) passes through the motor cavity; Stator assembly (4), which is installed in the motor cavity and sleeved on the motor shaft (3); Rotor assembly (5), which is rotatably sleeved on the motor shaft (3); A heat-conducting sleeve (6) is fitted onto the motor shaft (3). One end of the heat-conducting sleeve (6) abuts against the stator assembly (4) and is connected to the stator assembly (4). The other end of the heat-conducting sleeve (6) is flush with the end face of the motor side cover (2) away from the outer hub (1). A heat sink (7) is sleeved on the motor shaft (3), and one end of the heat sink (7) is connected to the other end of the heat-conducting sleeve (6).

2. The hub motor of the electric-assisted bicycle according to claim 1, characterized in that, The thermally conductive sleeve (6) is coated with thermally conductive silicone grease on one end facing the stator assembly (4).

3. The hub motor of the electric-assisted bicycle according to claim 1, characterized in that, The stator assembly (4) is provided with a first fixing hole (401), and the heat-conducting sleeve (6) is provided with a second fixing hole (6011). The first fixing member (11) passes through the first fixing hole (401) and connects with the second fixing hole (6011) to fix the heat-conducting sleeve (6) on the stator assembly (4).

4. The hub motor of the electric-assisted bicycle according to claim 1, characterized in that, The central hole of the heat-conducting sleeve (6) is a stepped hole with a first stepped surface. The motor shaft (3) has a second stepped surface. A sealing element (8) is provided on the motor shaft (3). The two opposite sides of the sealing element (8) abut against the first stepped surface and the second stepped surface, respectively.

5. The hub motor of the electric-assisted bicycle according to claim 1, characterized in that, It also includes a connecting sleeve (9), which is fitted onto the heat-conducting sleeve (6), and a bearing (14) is provided between the connecting sleeve (9) and the motor side cover (2).

6. The hub motor of the electric-assisted bicycle according to claim 5, characterized in that, An oil seal (10) is also provided between the motor side cover (2) and the connecting sleeve (9), and the oil seal (10) is located on the side of the bearing (14) away from the stator assembly (4).

7. The hub motor of the electric-assisted bicycle according to claim 1, characterized in that, The heat-conducting sleeve (6) includes a sleeve portion (602) and a connecting plate (601) connected to one end of the sleeve portion (602). The connecting plate (601) is used to connect to the stator assembly (4). The end face of the sleeve portion (602) away from the connecting plate (601) abuts against the heat sink (7).

8. The hub motor of the electric-assisted bicycle according to claim 1, characterized in that, The heat sink (7) is provided with a third fixing hole (701), and the heat-conducting sleeve (6) is provided with a fourth fixing hole (6021). The second fixing member (12) passes through the third fixing hole (701) and connects with the fourth fixing hole (6021) to fix the heat sink (7) on the heat-conducting sleeve (6).

9. The hub motor of the electric-assisted bicycle according to claim 1, characterized in that, The heat sink (7) has a plurality of spaced heat dissipation fins (702) on the side opposite to the heat-conducting sleeve (6).

10. An electric-assisted bicycle, characterized in that, The electric-assisted bicycle includes a body, wheels, and a hub motor as described in any one of claims 1-9, wherein the hub motor is mounted on the wheels.

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