A type of air-cooled hub motor for electric bicycles

Abstract

This utility model discloses a wind-cooled hub motor for power-assisted bicycles, mainly composed of a first outer shell, a second outer shell, a drive assembly, and a transmission assembly. The annular portion of the first outer shell has equidistantly distributed annular heat sinks and second heat dissipation holes, while the end portion is equipped with annularly distributed end-face heat sinks and first heat dissipation holes, effectively enhancing heat dissipation. In the drive assembly, the inner rotor is rotatably connected to the main shaft via a rotating bearing, while the outer stator is fixed to the main shaft. The transmission assembly includes a sun gear, planetary gears, etc., to achieve power transmission and speed change. During operation, the outer stator is energized, causing the inner rotor to rotate, which drives the wheel via gear transmission. Simultaneously, the heat dissipation structure on the first outer shell removes the heat generated by the motor's operation through airflow. This motor, through optimized structural design, significantly improves heat dissipation performance, thereby extending the motor's service life and operating efficiency, providing a new approach for the development of hub motor technology for power-assisted bicycles.

Description

Technical Field

[0001] This utility model relates to the field of power-assisted bicycle technology, specifically to a wind-cooled power-assisted bicycle hub motor. Background Technology

[0002] With increasing environmental awareness and a pursuit of convenient travel, electric bicycles have become widely used. As the core component of electric bicycles, the hub motor's performance has a crucial impact on the overall performance of the bicycle. Currently, traditional bicycle hub motors generate a large amount of heat during operation, and existing heat dissipation methods are often ineffective, leading to excessively high motor temperatures, which affects the motor's lifespan and operating efficiency.

[0003] Therefore, it is of great significance to provide a wind-cooled hub motor for power-assisted bicycles that can solve the problems existing in the current technology. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an air-cooled hub motor for power-assisted bicycles to solve the problem.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A wind-cooled power-assisted bicycle hub motor includes a first housing and a second housing. The first housing includes an annular portion and an end portion. A first and a second spoke mounting ring are respectively installed on both sides of the surface of the annular portion. Multiple annular heat sinks are installed on the surface of the annular portion, and the multiple annular heat sinks are evenly distributed and have multiple second heat dissipation holes on their surfaces. The surface of the end portion is equipped with annularly distributed end portion heat sinks, and the surface of the end portion heat sinks has first heat dissipation holes. The first heat dissipation holes are fixedly connected to the first housing by fastening bolts.

[0007] Furthermore, the hub motor also includes a drive assembly and a transmission assembly. The drive assembly includes a rotary bearing, a main shaft, an inner rotor, and an outer stator. The inner rotor is rotatably connected to the main shaft via the rotary bearing, and the outer stator is fixedly connected to the main shaft. The transmission assembly includes a sun gear, planetary gears, a gear carrier, and a gear ring. The sun gear is mounted at the output end of the inner rotor. The gear carrier is fixedly connected to the main shaft. The planetary gears are rotatably connected to the gear carrier. The gear ring is fixedly connected to the outer casing. The planetary gears mesh with the sun gear and with the gear ring.

[0008] In addition, both outer casing 2 and outer casing 1 are provided with sealing rings and bearings on their end faces. Both outer casing 2 and outer casing 1 are rotatably connected to the main shaft through bearings, and the sealing rings are installed on the end faces of the bearings.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. High-efficiency heat dissipation: The annular part of the outer casing is equipped with multiple annular heat sinks, and the annular heat sinks are provided with heat dissipation holes. The end face is equipped with end face heat sinks and heat dissipation holes. This multi-directional heat dissipation structure increases the heat dissipation area and improves the heat dissipation efficiency. It can dissipate the heat generated by the motor in a timely manner, effectively prevent the motor from degrading due to overheating, and extend the service life of the motor.

[0011] 2. Reliable transmission: The transmission components adopt a structure of sun gear, planetary gear and gear carrier. Through the meshing connection of planetary gear with sun gear and gear ring, the power is transmitted efficiently, which improves the stability and reliability of the transmission.

[0012] 3. Good sealing performance: The sealing rings and bearings set on the end faces of the second and first outer shells ensure the sealing performance of the motor, preventing external dust, moisture and other substances from entering the motor and affecting its normal operation, thus improving the motor's environmental adaptability and reliability.

[0013] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0014] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a side view of the present invention.

[0019] In the diagram: 1. Outer shell 1; 2. Rotary bearing; 3. Main shaft; 4. Inner rotor; 5. Outer stator; 6. Planetary gear; 7. Gear carrier; 8. Annular heat sink; 9. Gear ring; 10. Sun gear; 11. Outer shell 2; 12. End face heat sink; 13. Heat dissipation hole 1; 14. Heat dissipation hole 2; 15. Banner mounting ring 1; 16. Banner mounting ring 2. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0021] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0022] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0023] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0024] Please see Figure 1-3 This utility model provides a technical solution for an air-cooled power-assisted bicycle hub motor: an air-cooled power-assisted bicycle hub motor, mainly including a housing 1, a housing 2 11, a drive assembly and a transmission assembly.

[0025] The outer casing 1 is an important component of the motor, comprising an annular portion and an end portion. A first-type spoke mounting ring 15 and a second-type spoke mounting ring 16 are respectively installed on both sides of the annular portion surface for mounting bicycle spokes. Multiple annular heat sinks 8 are installed on the surface of the annular portion, equidistantly distributed to effectively increase the heat dissipation area and improve heat dissipation efficiency. Multiple second-type heat dissipation holes 14 are formed on the surface of the annular heat sinks 8 to further enhance heat dissipation. Annularly distributed end portion heat sinks 12 are installed on the surface of the end portion, with first-type heat dissipation holes 13 formed on their surface. The first-type heat dissipation holes 13 are fixedly connected to the outer casing 1 by fastening bolts, ensuring the stable installation of the end portion heat sinks 12.

[0026] The drive assembly includes a rotary bearing 2, a main shaft 3, an inner rotor 4, and an outer stator 5. The inner rotor 4 is rotatably connected to the main shaft 3 via the rotary bearing 2, ensuring that the inner rotor 4 can rotate flexibly relative to the main shaft 3; the outer stator 5 is fixedly connected to the main shaft 3, providing a stable magnetic field for the operation of the motor.

[0027] The transmission assembly includes a sun gear 10, planetary gears 6, a gear carrier 7, and a gear ring 9. The sun gear 10 is mounted on the output end of the inner rotor 4 and is used to transmit the power of the inner rotor 4. The gear carrier 7 is fixedly connected to the main shaft 3 and provides support for the planetary gears 6. The planetary gears 6 are rotatably connected to the gear carrier 7 and can rotate freely on the gear carrier 7. The gear ring 9 is fixedly connected to the outer casing 11. The planetary gears 6 mesh with the sun gear 10 and also mesh with the gear ring 9. Through this gear transmission structure, efficient power transmission and speed change functions are achieved.

[0028] Both outer casing 2 (11) and outer casing 1 (1) are equipped with sealing rings and bearings on their end faces. Both outer casing 2 (11) and outer casing 1 (1) are rotatably connected to the main shaft 3 via bearings. The sealing rings are installed on the end faces of the bearings, serving to seal and prevent dust, protecting the internal structure of the motor, and improving the reliability and service life of the motor.

[0029] In practical use, when the air-cooled power-assisted bicycle hub motor is working, the outer stator 5 is energized to generate a magnetic field. Under the influence of this magnetic field, the inner rotor 4 rotates around the main shaft 3 via the rotating bearing 2. The rotation of the inner rotor 4 drives the sun gear 10, which is mounted on its output end, to rotate. The sun gear 10 meshes with the planetary gear 6, thereby driving the planetary gear 6 to rotate on the gear carrier 7. At the same time, the planetary gear 6 meshes with the ring gear 9. Since the ring gear 9 is fixed to the outer casing 11, the rotation of the planetary gear 6 drives the gear carrier 7 to rotate, which in turn transmits power to the bicycle wheels through the main shaft 3, thus enabling the bicycle to move with power.

[0030] During motor operation, a large amount of heat is generated. At this time, the annular heat sink 8 and the end-face heat sink 12 on the outer casing 1 play a crucial role. The annular heat sink 8 is distributed in the annular portion, and its surface features heat dissipation holes 14 and an equidistant distribution structure, increasing the contact area with air. Airflow allows the heat on the annular heat sink 8 to be quickly carried away. The end-face heat sink 12 is distributed in a ring on the end portion, and its surface features heat dissipation holes 13, further increasing the heat dissipation area. Airflow effectively reduces the temperature of the end portion. This air-cooling method effectively dissipates the heat generated by the motor, ensuring stable operation at a suitable temperature and improving motor performance and lifespan.

[0031] The above description is merely a preferred embodiment of this utility model and does not limit the scope of protection of this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations made to these embodiments within the spirit and principles of this utility model, through conventional substitutions or methods that achieve the same function without departing from the principles and spirit of this utility model, fall within the scope of protection of this utility model.

Claims

1. A wind-cooled hub motor for power-assisted bicycles, characterized in that, include: Outer shell 1 (1) and outer shell 2 (11); the outer shell 1 (1) includes an annular part and an end part. A first strip mounting ring (15) and a second strip mounting ring (16) are respectively installed on both sides of the surface of the annular part. A ring-shaped heat sink (8) is installed on the surface of the annular part. There are multiple ring-shaped heat sinks (8). The multiple ring-shaped heat sinks (8) are distributed at equal intervals. A multiple second heat dissipation hole (14) is opened on the surface of the ring-shaped heat sink (8). An end-shaped heat sink (12) is installed on the surface of the end part. The end-shaped heat sink (12) is distributed in an annular shape. A first heat dissipation hole (13) is opened on the surface of the end-shaped heat sink (12). The first heat dissipation hole (13) is fixedly connected to the outer shell 1 (1) by fastening bolts.

2. The air-cooled hub motor for a power-assisted bicycle according to claim 1, characterized in that, It also includes drive components and transmission components; The drive assembly includes a rotating bearing (2), a main shaft (3), an inner rotor (4), and an outer stator (5). The inner rotor (4) is rotatably connected to the main shaft (3) through the rotating bearing (2), and the outer stator (5) is fixedly connected to the main shaft (3).

3. The air-cooled power-assisted bicycle hub motor according to claim 2, characterized in that, The transmission assembly includes a sun gear (10), a planetary gear (6), a gear carrier (7), and a gear ring (9). The sun gear (10) is installed at the output end of the inner rotor (4). The gear carrier (7) is fixedly connected to the main shaft (3). The planetary gear (6) is rotatably connected to the gear carrier (7). The gear ring (9) is fixedly connected to the outer casing (11). The planetary gear (6) is meshed with the sun gear (10). The planetary gear (6) is meshed with the gear ring (9).

4. The air-cooled power-assisted bicycle hub motor according to claim 1, characterized in that, Both the second outer shell (11) and the first outer shell (1) are provided with sealing rings and bearings on their end faces. Both the second outer shell (11) and the first outer shell (1) are rotatably connected to the main shaft (3) through the bearings. The sealing rings are installed on the end faces of the bearings.

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