Shaft-fixed hub motor

Abstract

The invention relates to the technical field of power motors, in particular to a shaft-fixed hub motor, which comprises a shell, a fixed base, a speed reduction module, a motor base, a driving motor, a connecting end cover and a fixed main shaft, and is characterized in that the shell is provided with a placement cavity, and the connecting end cover is arranged at one end of the shell and covers the placement cavity; the driving motor, the motor base, the fixed base and the fixed spindle are sequentially arranged in the containing cavity from inside to outside, the speed reduction module is arranged in the fixed base, the fixed base is provided with a rotary connecting element and arranged in the containing cavity through the rotary connecting element, the driving motor is provided with an output shaft, one end of the output shaft extends to the fixed base, and the other end of the output shaft extends to the fixed spindle. The driving module is in driving connection with the speed reduction module; the placement cavity is provided with a transmission connecting part, and the transmission connecting part is in driving connection with the speed reduction module so as to drive the shell to rotate under the action of the driving motor. The hub driving device is reasonable in structure, high in bearing capacity and particularly suitable for hub driving scenarios with high requirements for space, efficiency and reliability.

Description

Technical Field

[0001] This invention relates to the field of power motor technology, and in particular to a hub motor with a fixed shaft. Background Technology

[0002] In the field of hub motor technology, traditional hub drive devices typically employ a configuration where the external rotor of the motor is directly driven or indirectly driven through external transmission components. This configuration suffers from problems such as large size, loose structure, low transmission efficiency, and insufficient environmental adaptability. On the one hand, conventional motors and reduction mechanisms are often arranged separately, resulting in excessively large axial dimensions, making it difficult to meet the compact requirements of modern electric vehicles for hub space. On the other hand, the long transmission path and numerous components not only increase energy loss but also reduce system response speed and transmission accuracy. Furthermore, open or semi-open transmission structures are susceptible to the intrusion of external contaminants such as dust and moisture, affecting gear meshing accuracy and motor lifespan, making it difficult to guarantee reliability.

[0003] While existing technologies attempt to integrate motors and reducers, they are mostly limited to radial layouts, failing to effectively achieve axial thinning and modularization, and lacking comprehensive optimization of overall sealing and vibration resistance. Therefore, there is an urgent need for a highly integrated, efficient, and well-sealed shaft-fixed hub motor structure to resolve the contradiction between space constraints, environmental protection, and transmission efficiency. Summary of the Invention

[0004] To solve the above problems, the present invention has a reasonable structure and strong load-bearing capacity, and is particularly suitable for fixed-axis hub motors in hub drive scenarios with high requirements for space, efficiency and reliability.

[0005] The technical solution adopted in this invention is as follows: a fixed-shaft hub motor, comprising a housing, a fixed base, a reduction module, a motor base, a drive motor, a connecting end cover, and a fixed main shaft. The housing has a mounting cavity, and the connecting end cover is disposed at one end of the housing and covers the mounting cavity. The drive motor, motor base, fixed base, and fixed main shaft are arranged sequentially from the inside to the outside of the mounting cavity. The reduction module is disposed within the fixed base. The fixed base is provided with a rotary connecting element and is disposed in the mounting cavity through the rotary connecting element. The drive motor is provided with an output shaft, one end of which extends to the fixed base and is drivenly connected to the reduction module. The mounting cavity is provided with a transmission connecting part, which is drivenly connected to the reduction module to drive the housing to rotate under the action of the drive motor.

[0006] A further improvement to the above solution is that the outer periphery of the outer shell is provided with a plurality of assembly ribs, which are evenly distributed in a circumferential direction on the outer periphery of the outer shell. One end of each assembly rib is provided with an assembly hole, and the connecting end cap is fixed to the assembly hole by a fixing element to cover the mounting cavity.

[0007] A further improvement to the above solution is that a connecting surface is provided at the port of the outer shell, a sealing mating surface is provided at the connecting end cover, a positioning inner ring and a sealing ring are provided at the sealing mating surface, the sealing ring is located outside the positioning inner ring, the positioning inner ring is used to fit at the port of the mounting cavity, the sealing mating surface is in contact with the connecting surface, and is sealed by the sealing ring.

[0008] A further improvement to the above solution is that the outer shell is provided with a weight-reducing groove on the outside of the mounting cavity. There are multiple weight-reducing grooves, which are evenly distributed in a circumferential direction on the outer shell and located on the outside of the mounting cavity. Reinforcing ribs are provided between two adjacent weight-reducing grooves.

[0009] A further improvement to the above scheme is that an upper connecting part and a lower connecting part are respectively provided on both sides of the fixed base, the fixed base is provided with a wiring channel, the wiring channel is used to connect the upper connecting part and the lower connecting part, the motor base is provided in the lower connecting part, and the fixed spindle is provided in the upper connecting part.

[0010] A further improvement to the above solution is that the wiring channel includes an upper groove, a lower groove, and a wiring hole. The upper groove is located at the upper connecting part, the lower groove is located at the lower connecting part, and the wiring hole is located on the fixed base and is used to connect the upper groove and the lower groove. The fixed spindle is provided with a wiring through hole, one end of which is connected to the upper groove.

[0011] A further improvement to the above solution is that the motor base is provided with a control board, the control board is provided with a connector, and the insertion end of the connector faces the lower groove.

[0012] A further improvement to the above solution is that the fixed base is provided with a lower connecting part, the lower connecting part is provided with a connecting inner ring and a connecting outer ring, the motor base is provided with a connecting boss, a connecting groove is formed between the connecting inner ring and the connecting outer ring, and the connecting boss is disposed in the connecting groove; the connecting outer ring is composed of multiple connecting ribs, the connecting ribs are provided with connecting fixing holes, and the side of the connecting boss is provided with a connecting threaded hole opposite to the connecting fixing hole, the connecting fixing hole is used to install screws and fix them to the connecting threaded hole.

[0013] A further improvement to the above scheme is that the drive motor includes a stator winding, a rotor housing, and a rotor assembly. The output shaft is mounted in the motor base via bearings. The stator winding is disposed on the outer periphery of the motor base. One end of the output shaft is connected to the rotor housing. The rotor housing is provided with a rotor assembly including multiple rotor magnets. The multiple rotor magnets are arranged in a circumferential manner on the inner periphery of the rotor housing and are opposite to the stator winding. The reduction module includes a sun gear and multiple planetary gears. The sun gear is disposed at one end of the output shaft. The multiple planetary gears are evenly distributed in a circumferential manner on the outer periphery of the sun gear and mesh with the sun gear. The transmission connection part is provided with a transmission gear ring, which meshes with the planetary gears.

[0014] A further improvement to the above solution is that the connecting end cover is provided with a rotating fixing cavity, the rotating fixing cavity is provided with a rotating bearing, and the rotating bearing is used to connect to the fixing base; the connecting end cover is provided with a sealing groove on the upper side of the rotating fixing cavity, and a sealing element is provided in the sealing groove, the sealing element is used to seal between the connecting end cover and the fixing spindle; the outer periphery of the sealing element is provided with a sealing lip, the sealing lip is used to seal against the wall of the sealing groove, and the inner periphery of the sealing element is provided with a sealing inner ring, the sealing inner ring is S-shaped and is used to abut against the outer wall of the fixing spindle.

[0015] The beneficial effects of this invention are: Compared to existing hub motors, this invention employs an axially stacked structure consisting of a drive motor, motor base, fixed base, and fixed spindle arranged sequentially from the inside out. This structure perfectly matches the mounting cavity within the outer casing, optimizing internal space utilization and shortening the radial dimension. This facilitates ultra-thin and lightweight design of the hub motor, enhancing the flexibility of vehicle space layout. The reduction module is integrated within the fixed base, forming a closed transmission unit. This allows the output shaft of the drive motor to directly drive the reduction module, resulting in a short transmission path, compact structure, effectively reducing energy loss, and improving transmission efficiency and response speed. Simultaneously, the closed structure prevents the intrusion of external dust, moisture, and other contaminants, significantly enhancing the durability and environmental adaptability of the transmission system. The fixed base is mounted within the mounting cavity via a rotating connecting element and is driven to the transmission connection part of the outer casing. When the motor is running, the fixed base and internal components remain stationary, while the drive torque is efficiently output to the transmission connection part through the reduction module, ultimately driving the outer casing to rotate, achieving a "fixed shaft, rotating casing" mode. This effectively distributes the load, reduces the inertia of moving parts, results in smoother operation, and significantly reduces vibration and noise. The connecting end cap covers the cavity opening, further enhancing overall sealing and protecting internal electromechanical components. The modular design not only facilitates assembly and maintenance but also improves production consistency, contributing to cost reduction. This invention features a rational structure and strong load-bearing capacity, making it particularly suitable for hub-driven applications with high requirements for space, efficiency, and reliability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the shaft-fixed hub motor of the present invention; Figure 2 for Figure 1 A three-dimensional schematic diagram of a centrally mounted hub motor from another perspective; Figure 3 for Figure 1 Exploded view of a hub motor with a fixed center shaft; Figure 4 for Figure 1 Front view of the hub motor with central axis fixed position; Figure 5 for Figure 4 Sectional view of AA; Figure 6 for Figure 1 A partial structural diagram of a hub motor with a fixed central shaft.

[0017] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Housing cavity; 111. Transmission connection part; 112. Transmission gear ring; 12. Rotary connecting element; 13. Assembly rib; 131. Assembly hole; 14. Weight reduction groove; 141. Reinforcing rib; 2. Fixing base; 21. Upper end connection part; 22. Lower end connection part; 22. Inner connecting ring; 221. Outer connecting ring; 222. Connecting rib; 223. Connecting fixing hole; 224. Wiring channel; 23. Upper groove; 231. Lower groove; 232. Wiring hole; 233. Reduction module; 3. Sun gear. Wheel 31, planetary gear 32, motor base 4, control board 41, connector 411, connecting boss 42, drive motor 5, output shaft 51, stator winding 52, rotor housing 53, rotor assembly 54, rotor magnet 541, connecting end cover 6, sealing mating surface 61, positioning inner ring 62, sealing ring 63, rotating fixed cavity 64, rotating bearing 641, sealing groove 65, sealing element 66, sealing outer lip 661, sealing inner ring 662, fixed spindle 7, wiring through hole 71. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0019] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Figures 1-6 As shown, in one embodiment of the present invention, a fixed-shaft hub motor is disclosed, comprising a housing 1, a fixed base 2, a reduction module 3, a motor base 4, a drive motor 5, a connecting end cover 6, and a fixed main shaft 7. The housing 1 is provided with a mounting cavity 11, and the connecting end cover 6 is disposed at one end of the housing 1 and covers the mounting cavity 11. The drive motor 5, the motor base 4, the fixed base 2, and the fixed main shaft 7 are arranged sequentially from the inside to the outside of the mounting cavity 11. The reduction module 3 is disposed within the fixed base 2. The fixed base 2 is provided with a rotating connecting element 12 and is disposed in the mounting cavity 11 through the rotating connecting element 12. The drive motor 5 is provided with an output shaft 51, one end of which extends to the fixed base 2 and is drivenly connected to the reduction module 3. The mounting cavity 11 is provided with a transmission connecting part 111, which is drivenly connected to the reduction module 3 to drive the housing 1 to rotate under the action of the drive motor 5. This embodiment employs an axially stacked structure consisting of a drive motor 5, a motor base 4, a fixed base 2, and a fixed spindle 7, arranged sequentially from the inside out. This structure closely matches the mounting cavity 11 within the outer casing 1, optimizing internal space utilization and shortening the radial dimension. This facilitates the ultra-thin and lightweight design of the hub motor, enhancing the flexibility of vehicle space layout. The reduction module 3 is integrated within the fixed base 2, forming a closed transmission unit. This allows the output shaft 51 of the drive motor 5 to directly drive the reduction module 3, resulting in a short transmission path and compact structure. This effectively reduces energy loss and improves transmission efficiency and response speed. Simultaneously, the closed structure prevents the intrusion of external dust, moisture, and other contaminants, enhancing the durability and environmental adaptability of the transmission system. The fixed base 2 is positioned within the mounting cavity 11 via a rotating connecting element 12 and is driven to connect to the transmission connection part 111 of the outer casing 1. When the motor is running, the fixed base 2 and its internal components remain stationary, while the driving torque is efficiently output to the transmission connection part 111 through the reduction module 3, ultimately driving the outer casing 1 to rotate, achieving a "fixed shaft, rotating casing" mode. The load is effectively distributed, reducing the inertia of moving parts, resulting in smoother operation and significantly reduced vibration and noise. The connecting end cap 6 covers the opening of the mounting cavity 11, further enhancing the overall sealing and protecting the internal electromechanical components. The overall modular design not only facilitates assembly and maintenance but also improves production consistency, which helps reduce costs. This embodiment has a reasonable structure and strong load-bearing capacity, making it particularly suitable for hub drive scenarios with high requirements for space, efficiency, and reliability.

[0021] Multiple assembly ribs 13 are provided on the outer periphery of the outer shell 1. These ribs 13 are evenly distributed circumferentially around the outer periphery of the outer shell 1. One end of each assembly rib 13 has an assembly hole 131. The connecting end cap 6 is fixed to the assembly hole 131 by a fixing element to cover the mounting cavity 11. In this embodiment, by evenly distributing multiple assembly ribs 13 circumferentially around the outer periphery of the outer shell 1 and providing assembly holes 131 at the ends of the ribs, the connecting end cap 6 can be securely fixed to the assembly hole 131 by fixing elements (such as screws), thereby achieving a reliable connection with the outer shell 1 and tightly covering the mounting cavity 11. This improves the connection rigidity and sealing performance of the end cap, effectively resists vibration and impact, prevents the end cap from loosening or shifting, and ensures the long-term stable operation of the internal components. The evenly distributed rib structure not only optimizes stress distribution and avoids local stress concentration but also enhances the overall rigidity of the outer shell 1.

[0022] A connecting surface is provided at the port of the outer shell 1, and a sealing mating surface 61 is provided on the connecting end cover 6. The sealing mating surface 61 is provided with a positioning inner ring 62 and a sealing ring 63. The sealing ring 63 is located outside the positioning inner ring 62. The positioning inner ring 62 is used to fit into the port of the mounting cavity 11. The sealing mating surface 61 fits against the connecting surface and is sealed by the sealing ring 63. In this embodiment, by providing a connecting surface at the port of the outer shell 1 and correspondingly providing a sealing mating surface 61 with a positioning inner ring 62 and a sealing ring 63 on the connecting end cover 6, a double sealing protection mechanism is formed. The precise fit between the positioning inner ring 62 and the port of the mounting cavity 11 enables rapid and accurate positioning and radial limiting of the end cover, effectively preventing assembly deviations and improving assembly efficiency and consistency. The sealing ring 63 is located outside the positioning inner ring 62. When the sealing mating surface 61 is pressed against the connecting surface, the sealing ring 63 is compressed and undergoes elastic deformation, forming a reliable full-circumference sealing barrier. This enhances the sealing performance at the interface between the end cover and the outer shell 1, effectively preventing external moisture, dust and impurities from entering the housing cavity 11. It protects core components such as the drive motor 5 and the reduction module 3 from contamination and corrosion, greatly improving the environmental adaptability, operational reliability and service life of the hub motor under complex working conditions.

[0023] The outer shell 1 has multiple weight-reducing grooves 14 located on the outer side of the mounting cavity 11. These grooves are evenly distributed circumferentially on the outer shell 1 and located on the outer side of the mounting cavity 11. Reinforcing ribs 141 are provided between adjacent weight-reducing grooves 14. In this embodiment, by evenly distributing multiple weight-reducing grooves 14 circumferentially on the outer side of the mounting cavity 11 of the outer shell 1 and providing reinforcing ribs 141 between adjacent weight-reducing grooves 14, an optimized balance between lightweighting and structural strength is achieved. The circumferentially distributed design of the weight-reducing grooves 14 effectively reduces the overall mass of the outer shell 1, reduces the rotational inertia of the motor, and is beneficial to improving the dynamic response performance and energy efficiency of the motor. At the same time, the reinforcing ribs 141 between adjacent weight-reducing grooves 14 form a reinforced structure, significantly enhancing the radial rigidity and torsional resistance of the outer shell 1, ensuring structural stability when subjected to internal electromagnetic forces, external loads, and vibration impacts, and preventing shell deformation.

[0024] The fixed base 2 has an upper connecting part 21 and a lower connecting part 22 on both sides. The fixed base 2 has a wiring channel 23 that connects the upper connecting part 21 and the lower connecting part 22. The motor base 4 is located on the lower connecting part 22, and the fixed spindle 7 is located on the upper connecting part 21. In this embodiment, by providing an upper connecting part 21 and a lower connecting part 22 on both sides of the fixed base 2, and internally providing a wiring channel 23 connecting the two, integrated optimization of the motor structure and wiring is achieved. The upper connecting part 21 is used to fix the spindle 7, providing a stable rotational support reference. The lower connecting part 22 fixes the motor base 4, ensuring accurate positioning of the drive unit. The design of the wiring channel 23 allows power lines, signal lines, etc., to pass through the inside of the fixed base 2, avoiding the problems of external wiring being susceptible to wear, interference, or environmental corrosion, and improving the reliability and neatness of cable arrangement.

[0025] The wiring channel 23 includes an upper groove 231, a lower groove 232, and a wiring hole 233. The upper groove 231 is located at the upper connecting part 21, the lower groove 232 is located at the lower connecting part 22, and the wiring hole 233 is located on the fixed base 2 and is used to connect the upper groove 231 and the lower groove 232. The fixed spindle 7 is provided with a wiring through hole 71, one end of which is connected to the upper groove 231. Specifically, the motor base 4 is provided with a control board 41, and the control board 41 is provided with a connector 411, the insertion end of which faces the lower groove 232. In this embodiment, by specifying the wiring channel 23 as an upper groove 231, a lower groove 232, and a wiring hole 233 connecting the two, and cooperating with the wiring through hole 71 inside the fixed spindle 7, a systematic and concealed integrated wiring solution is formed. The upper slot 231 aligns with the spindle wiring through-hole 71, enabling a safe transition of the cable from the rotating axis to the fixed base 2. The lower slot 232 directly faces the connector 411 insertion end on the control board 41 of the motor base 4, allowing the cable to be directly inserted into the connector 411 through the wiring hole 233 from the lower slot 232. This greatly simplifies the assembly process and avoids repeated wire threading operations. It effectively protects the cable from mechanical wear and external interference, shortens the wire length, reduces signal attenuation and electromagnetic compatibility risks, and improves sealing and space utilization.

[0026] The fixed base 2 is provided with a lower connecting part 22, which is provided with an inner connecting ring 221 and an outer connecting ring 222. The motor base 4 is provided with a connecting boss 42. A connecting groove is formed between the inner connecting ring 221 and the outer connecting ring 222, and the connecting boss 42 is disposed in the connecting groove. The outer connecting ring 222 is composed of multiple connecting ribs 223, and each connecting rib 223 is provided with a connecting fixing hole 224. The side of the connecting boss 42 is provided with a connecting threaded hole opposite to the connecting fixing hole 224. The connecting fixing hole 224 is used to install screws and fix them to the connecting threaded hole. In this embodiment, by providing a connecting groove composed of the inner connecting ring 221 and the outer connecting ring 222 in the lower connecting part 22, and embedding the connecting boss 42 of the motor base 4 into the groove, high-precision positioning and modular assembly are achieved. The outer ring 222 is composed of multiple connecting ribs 223, which effectively reduces the structural weight and enhances the heat dissipation capacity. The connecting fixing holes 224 on the ribs and the connecting threaded holes on the side of the connecting boss 42 are fastened with screws, forming a multi-point and multi-directional locking force distribution, which significantly improves the connection rigidity and vibration resistance, and prevents fretting wear or loosening during motor operation.

[0027] The drive motor 5 includes a stator winding 52, a rotor housing 53, and a rotor assembly 54. The output shaft 51 is mounted within the motor base 4 via bearings. The stator winding 52 is disposed on the outer periphery of the motor base 4. One end of the output shaft 51 is connected to the rotor housing 53. The rotor housing 53 is equipped with the rotor assembly 54, which includes multiple rotor magnets 541 arranged circumferentially on the inner periphery of the rotor housing 53, opposite to the stator winding 52. In this embodiment, by fixing the stator winding 52 to the outer periphery of the motor base 4 and circumferentially arranging multiple rotor magnets 541 on the inner periphery of the rotor housing 53, an external rotor magnetic circuit layout is achieved, effectively increasing torque output density and heat dissipation area. The output shaft 51 is supported within the motor base 4 by bearings and directly connected to the rotor housing 53, shortening the power transmission path, reducing intermediate transmission losses, and improving energy efficiency. The rotor magnets 541 and stator winding 52 are arranged radially opposite each other, forming a uniform air gap magnetic field, enhancing electromagnetic coupling efficiency, and reducing torque fluctuations and operating noise. With its compact structure, it makes full use of the hub space. At the same time, the external rotor design can directly drive the wheel rim, eliminating the need for an additional reduction mechanism, which improves the system response speed and reliability. It is suitable for electric vehicle scenarios with high load and high dynamic requirements.

[0028] The reduction module 3 includes a sun gear 31 and multiple planetary gears 32. The sun gear 31 is located at one end of the output shaft 51, and the multiple planetary gears 32 are evenly distributed circumferentially around the sun gear 31 and mesh with it. The transmission connection part 111 is provided with a transmission gear ring 112, which meshes with the planetary gears 32. In this embodiment, by using a planetary gear 32 reduction mechanism, the sun gear 31 is directly located at the end of the motor output shaft 51, achieving efficient integration and compact layout of power output. The multiple planetary gears 32 are evenly distributed circumferentially around the sun gear 31 and mesh with the transmission gear ring 112 in the transmission connection part 111, effectively distributing the load, improving transmission smoothness and load-bearing capacity, and reducing single-tooth stress and wear. The reduction structure features a high reduction ratio and high torque output, while reducing the radial dimension, which is beneficial for optimizing the internal space of the hub. The symmetrical layout of the planetary gears 32 improves the dynamic balance of the system, reduces vibration and noise, and enhances operational reliability.

[0029] The connecting end cap 6 is provided with a rotating fixing cavity 64, and the rotating fixing cavity 64 is provided with a rotating bearing 641, which is used to connect to the fixed base 2. A sealing groove 65 is provided on the upper side of the connecting end cap 6 located in the rotating fixing cavity 64. A sealing element 66 is provided within the sealing groove 65, and the sealing element 66 is used to seal between the connecting end cap 6 and the fixed spindle 7. A sealing lip 661 is provided on the outer periphery of the sealing element 66, which is used to seal against the wall of the sealing groove 65. A sealing inner ring 662 is provided on the inner periphery of the sealing element 66. The sealing inner ring 662 is S-shaped and is used to abut against the outer wall of the fixed spindle 7. In this embodiment, the rotating fixing cavity 64 and the rotating bearing 641 provided in the connecting end cap 6 achieve reliable rotational support with the fixed base 2, effectively sharing the radial load and ensuring smooth relative rotation. The sealing element 66, located within the sealing groove 65, tightly abuts against the groove wall via its outer sealing lip 661, forming a static sealing barrier to prevent the intrusion of external contaminants. Its inner circumference employs a unique S-shaped sealing inner ring 662 structure, utilizing elastic deformation to tightly fit and fix the outer wall of the main shaft 7, maintaining stable contact pressure even under dynamic rotation conditions, thus improving sealing reliability. This dual-seal design effectively isolates water, dust, and other impurities from entering the motor, extending the service life of bearings and transmission components, while reducing operating friction resistance. It balances sealing performance with energy efficiency, making it suitable for long-term sealing requirements in harsh environments.

[0030] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A hub motor with a fixed shaft, characterized in that: The device includes a housing, a fixed base, a reduction module, a motor base, a drive motor, a connecting end cover, and a fixed spindle. The housing has a mounting cavity, and the connecting end cover is located at one end of the housing and covers the mounting cavity. The drive motor, motor base, fixed base, and fixed spindle are arranged sequentially from the inside to the outside of the mounting cavity. The reduction module is located inside the fixed base, and the fixed base has a rotating connecting element, which is used to mount the device in the mounting cavity. The drive motor has an output shaft, one end of which extends to the fixed base and is driven to connect with the reduction module. The mounting cavity has a transmission connection part, which is driven to connect with the reduction module to drive the housing to rotate under the action of the drive motor.

2. The shaft-fixed hub motor according to claim 1, characterized in that: The outer periphery of the outer shell is provided with a plurality of assembly ribs, which are evenly distributed in a circumferential direction on the outer periphery of the outer shell. One end of each assembly rib is provided with an assembly hole, and the connecting end cap is fixed to the assembly hole by a fixing element to cover the mounting cavity.

3. The shaft-fixed hub motor according to claim 1, characterized in that: The outer shell has a connecting surface at its port, and the connecting end cover has a sealing mating surface. The sealing mating surface has a positioning inner ring and a sealing ring. The sealing ring is located outside the positioning inner ring. The positioning inner ring is used to fit into the port of the mounting cavity. The sealing mating surface fits into the connecting surface and is sealed by the sealing ring.

4. The shaft-fixed hub motor according to claim 1, characterized in that: The outer shell is provided with weight-reducing grooves on the outside of the mounting cavity. There are multiple weight-reducing grooves, which are evenly distributed in a circumferential direction on the outer shell and located on the outside of the mounting cavity. Reinforcing ribs are provided between two adjacent weight-reducing grooves.

5. The shaft-fixed hub motor according to claim 1, characterized in that: The fixed base has an upper connecting part and a lower connecting part on both sides, and the fixed base has a wiring channel for connecting the upper connecting part and the lower connecting part. The motor base is located in the lower connecting part, and the fixed spindle is located in the upper connecting part.

6. The shaft-fixed hub motor according to claim 5, characterized in that: The wiring channel includes an upper groove, a lower groove, and a wiring hole. The upper groove is located at the upper connecting part, the lower groove is located at the lower connecting part, and the wiring hole is located on the fixed base and is used to connect the upper groove and the lower groove. The fixed spindle is provided with a wiring through hole, one end of which is connected to the upper groove.

7. The shaft-fixed hub motor according to claim 6, characterized in that: The motor base is equipped with a control board, and the control board is equipped with a connector, with the insertion end of the connector facing the lower groove.

8. The shaft-fixed hub motor according to claim 1, characterized in that: The fixed base is provided with a lower end connecting part, which is provided with an inner connecting ring and a outer connecting ring. The motor base is provided with a connecting boss. A connecting groove is formed between the inner connecting ring and the outer connecting ring, and the connecting boss is disposed in the connecting groove. The outer connecting ring is composed of multiple connecting ribs, and the connecting ribs are provided with connecting fixing holes. The side of the connecting boss is provided with a connecting threaded hole opposite to the connecting fixing hole. The connecting fixing hole is used to install screws and fix them to the connecting threaded hole.

9. The shaft-fixed hub motor according to claim 1, characterized in that: The drive motor includes a stator winding, a rotor housing, and a rotor assembly. The output shaft is mounted in the motor base via bearings. The stator winding is located on the outer periphery of the motor base. One end of the output shaft is connected to the rotor housing. The rotor housing is provided with a rotor assembly including multiple rotor magnets arranged circumferentially on the inner periphery of the rotor housing and opposite to the stator winding. The reduction module includes a sun gear and multiple planetary gears. The sun gear is located at one end of the output shaft. The multiple planetary gears are evenly distributed circumferentially on the outer periphery of the sun gear and mesh with the sun gear. The transmission connection part is provided with a transmission gear ring, which meshes with the planetary gears.

10. The shaft-fixed hub motor according to claim 1, characterized in that: The connecting end cap is provided with a rotating fixing cavity, and the rotating fixing cavity is provided with a rotating bearing for connecting to the fixing base; the connecting end cap is provided with a sealing groove on the upper side of the rotating fixing cavity, and a sealing element is provided in the sealing groove for sealing between the connecting end cap and the fixing spindle; the outer periphery of the sealing element is provided with a sealing lip for sealing against the wall of the sealing groove, and the inner periphery of the sealing element is provided with a sealing inner ring, which is S-shaped and abuts against the outer wall of the fixing spindle.

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