Hub motor fixing structure

Abstract

The utility model relates to power motor technical field, especially a wheel hub motor fixed structure, including fixed main shaft, output shell, output motor and connecting end cover, output shell is provided with the accommodation chamber, output motor sets up in the accommodation chamber, connecting end cover sets up at one end of the accommodation chamber, and is connected with output shell, fixed main shaft is along the axial setting of shell, and output motor includes stator subassembly, rotor shell and rotor magnetic tile, stator subassembly sets up on fixed main shaft, rotor shell is provided with rotor bearing and fixed main shaft connection, rotor shell is connected with output shell to drive output shell rotation, rotor magnetic tile sets up in the inner periphery of rotor shell, and opposite stator subassembly, the utility model discloses through compact design, high-precision positioning, excellent bearing capacity and simple maintenance characteristics, has promoted the performance and reliability of motor, is applicable to the mobile device of the higher volume, efficiency and durability requirement.

Description

Technical Field

[0001] This utility model relates to the field of power motor technology, and in particular to a hub motor fixing structure. Background Technology

[0002] With the rapid development of electric vehicles, in-wheel motors, as an innovative drive solution, have attracted much attention due to their compactness and high efficiency. In-wheel motors integrate the electric motor directly inside the wheel, achieving a tight connection between the motor and the wheel hub, offering significant advantages in saving space and improving power transmission efficiency. However, existing in-wheel motors still face some challenges regarding the stability of internally integrated motors and their space requirements.

[0003] The integrated motor inside the wheel hub needs to withstand various external forces and vibrations generated during vehicle operation. This challenges the stability of the motor's installation within the wheel hub. Existing mounting methods are susceptible to uneven distribution of dynamic loads, leading to motor displacement or loosening during operation, thus reducing motor efficiency and lifespan. Therefore, a new design is needed for the existing internal drive structure of the wheel hub motor. Utility Model Content

[0004] To address the aforementioned issues, this invention significantly improves the performance and reliability of the motor through its compact design, high-precision positioning, excellent load-bearing capacity, and easy maintenance. It is suitable for the hub motor fixing structure of mobile devices with high requirements for size, efficiency, and durability.

[0005] The technical solution adopted by this utility model is: a hub motor fixing structure, including a fixed main shaft, an output housing, an output motor, and a connecting end cover. The output housing is provided with a mounting cavity, and the output motor is installed in the mounting cavity. The connecting end cover is installed at one end of the mounting cavity and connected to the output housing. The fixed main shaft is arranged along the axial direction of the housing. The output motor includes a stator assembly, a rotor housing, and rotor magnets. The stator assembly is installed on the fixed main shaft. The rotor housing is provided with a rotor bearing and connected to the fixed main shaft. The rotor housing is connected to the output housing to drive the output housing to rotate. The rotor magnets are installed on the inner circumference of the rotor housing and are opposite to the stator assembly.

[0006] A further improvement to the above scheme is that an output component is provided inside the mounting cavity. The input end of the output component is connected to the rotor housing, and the output end is connected to the output housing. The rotor housing is driven to rotate by the output component.

[0007] A further improvement to the above scheme is that the output component includes a sun gear, planetary gears, and a gear ring. The sun gear is connected to the rotor housing, the planetary gears mesh with the sun gear, and the gear ring is disposed in the mounting cavity of the output housing and meshes with the planetary gears.

[0008] A further improvement to the above scheme is that the fixed spindle includes a stator fixing part, an end cover fixing part, and a fixing end, which are arranged in sequence. The stator fixing part is used to install the stator assembly. One end of the output housing is provided with an output end cover. A first bearing connection is provided between the output end cover and the end cover fixing part.

[0009] A further improvement to the above scheme is that the output end cover is provided with an inner step and an outer step, the inner step is used to install a first bearing, the outer step is used to install a second bearing, and the outer periphery of the second bearing is connected to the connecting end cover.

[0010] A further improvement to the above solution is that the end cap fixing part is provided with a first sealing groove, the first sealing groove is provided with a first sealing ring, and the first sealing ring is used for sealing the first bearing and the inner step.

[0011] A further improvement to the above solution is that the outer step is provided with a second sealing groove, the second sealing groove is provided with a second sealing ring, and the second sealing ring is used to seal between the outer step and the second bearing.

[0012] A further improvement to the above solution is that a bracket is provided on the side of the stator assembly facing the connecting end cover, a circuit board is provided on the bracket, a wiring hole is provided on the fixed spindle, a connecting wire is provided in the wiring hole, and the connecting wire is used to connect the circuit board.

[0013] A further improvement to the above solution is that the connecting end cover is provided with a plurality of connecting screws, and the end of the output housing is provided with a connecting hole, which is used to engage the connecting screws to fix the connecting end cover to the output housing.

[0014] A further improvement to the above solution is that a hub rubber sheet is provided on the outside of the output housing, the hub rubber sheet covers the output housing, and its end abuts against the connecting end cover.

[0015] The beneficial effects of this utility model are: Compared to existing hub motors, this invention integrates the output motor within the mounting cavity of the output housing, effectively saving space. This allows the hub motor to be better embedded inside the vehicle's tires, lowering the vehicle's center of gravity and improving handling and stability. The fixed spindle ensures the stability of the motor stator assembly, and the rotor housing is connected to the fixed spindle via rotor bearings, ensuring coaxiality between the stator and rotor. This high-precision coaxial design significantly reduces vibration and noise during operation, improving the motor's smoothness. The rotor housing design effectively bears radial and part of the axial forces from the output housing, optimizing load distribution and reducing local stress concentration. This enhances the motor's load-bearing capacity and extends component lifespan. The tight connection between the connecting end cap and the output housing simplifies the motor assembly process. The modular design allows for easy disassembly and assembly of the stator, rotor, and bearings, reducing maintenance and replacement difficulties and greatly improving production efficiency and ease of maintenance. The mounting cavity provides a good heat dissipation environment for the motor, helping to effectively dissipate heat and prevent overheating from affecting motor performance. The connection between the rotor housing and the output housing directly drives the motor output, reducing transmission losses that may exist in traditional motor structures. This improves the overall efficiency of the motor, enabling it to output greater torque at the same power. Through its compact design, high-precision positioning, excellent load-bearing capacity, and easy maintenance, this invention significantly enhances the performance and reliability of the motor, making it suitable for mobile devices with high requirements for size, efficiency, and durability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the hub motor fixing structure of this utility model; Figure 2 for Figure 1 Exploded view of the fixing structure of the hub motor; Figure 3 for Figure 1 Front view of the weight reduction structure of the motor housing; Figure 4 for Figure 4 Sectional view of AA; Figure 5 for Figure 1 A schematic diagram of the output motor of the fixed structure of the hub motor.

[0017] Explanation of reference numerals in the attached drawings: 1. Fixed spindle; 11. Stator fixing part; 12. End cover fixing part; 121. First sealing groove; 13. Fixed end; 14. Wiring hole; 15. Connecting wire; 2. Output housing; 21. Housing cavity; 22. Output assembly; 221. Sun gear; 222. Planetary gear; 223. Gear ring; 23. Second bearing; 24. Output end cover; 241. First bearing; 242. Inner step; 243. Outer step; 244. Second sealing groove; 25. Hub rubber; 3. Output motor; 31. Stator assembly; 311. Bracket; 312. Circuit board; 32. Rotor housing; 321. Rotor bearing; 33. Rotor magnet; 4. Connecting end cover; 41. Connecting screw. Detailed Implementation

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

[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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Figures 1-5As shown, in one embodiment of this utility model, a hub motor fixing structure is provided, including a fixed main shaft 1, an output housing 2, an output motor 3, and a connecting end cover 4. The output housing 2 is provided with a mounting cavity 21, and the output motor 3 is disposed in the mounting cavity 21. The connecting end cover 4 is disposed at one end of the mounting cavity 21 and connected to the output housing 2. The fixed main shaft 1 is arranged along the axial direction of the housing. The output motor 3 includes a stator assembly 31, a rotor housing 32, and rotor magnets 33. The stator assembly 31 is disposed on the fixed main shaft 1. The rotor housing 32 is provided with a rotor bearing 321 and connected to the fixed main shaft 1. The rotor housing 32 is connected to the output housing 2 to drive the output housing 2 to rotate. The rotor magnets 33 are disposed on the inner circumference of the rotor housing 32 and are opposite to the stator assembly 31. This embodiment integrates the output motor 3 into the mounting cavity 21 of the output housing 2, effectively saving space. This allows the hub motor to be better embedded inside the vehicle's tire, lowering the vehicle's center of gravity and improving handling and stability. The fixed spindle 1 ensures the stability of the motor stator assembly 31. The rotor housing 32 is connected to the fixed spindle 1 via rotor bearings 321, ensuring coaxiality between the stator and rotor. This high-precision coaxial design significantly reduces vibration and noise during operation, improving the motor's smoothness. The rotor housing 32's design effectively bears radial and partial axial forces from the output housing 2, optimizing load distribution and reducing local stress concentration. This enhances the motor's load-bearing capacity and extends component lifespan. The tight connection between the connecting end cover 4 and the output housing 2 simplifies the motor assembly process. The modular design allows for easy disassembly and assembly of the stator, rotor, and bearings, reducing maintenance and replacement difficulties and greatly improving production efficiency and ease of maintenance. The mounting cavity 21 provides a good heat dissipation environment for the motor, facilitating effective heat dissipation and preventing overheating from affecting motor performance. The connection between the rotor housing 32 and the output housing 2 directly drives the motor's output, reducing transmission losses that may exist in traditional motor structures. This improves the overall efficiency of the motor, enabling it to output greater torque at the same power output. This embodiment significantly improves the performance and reliability of the motor through its compact design, high-precision positioning, excellent load-bearing capacity, and easy maintenance features, making it suitable for mobile devices with high requirements for size, efficiency, and durability.

[0021] An output component 22 is disposed within the mounting cavity 21. The input end of the output component 22 is connected to the rotor housing 32, and the output end is connected to the output housing 2. The rotor housing 32 drives the output housing 2 to rotate via the output component 22. Specifically, the output component 22 includes a sun gear 221, a planetary gear 222, and a gear ring 223. The sun gear 221 is connected to the rotor housing 32, the planetary gear 222 meshes with the sun gear 221, and the gear ring 223 is disposed in the mounting cavity 21 of the output housing 2 and meshes with the planetary gear 222. In this embodiment, the design of the output component 22 allows the rotor housing 32 to directly drive the planetary gear 222 via the sun gear 221, and the planetary gear 222 then meshes with the gear ring 223, thereby effectively transferring the rotational kinetic energy of the rotor to the output housing 2. This gear combination not only reduces energy loss but also achieves efficient torque output, ensuring that the motor maintains excellent performance under high load conditions. The use of the planetary gear 222 mechanism allows for a more compact transmission system design, achieving a larger gear ratio within a smaller space compared to traditional spur gear drives. This reduces the overall system weight and provides greater design flexibility for hub motor integration, facilitating optimized layout within limited tire space. The planetary gear 222 layout evenly distributes the load, reducing contact stress between gears, lowering the risk of wear and failure, and thus extending the motor's lifespan. Simultaneously, the characteristics of gear transmission reduce vibration and noise during operation, improving driving comfort.

[0022] The fixed spindle 1 includes a stator fixing part 11, an end cap fixing part 12, and a fixed end part 13 arranged sequentially. The stator fixing part 11 is used to install the stator assembly 31. One end of the output housing 2 is provided with an output end cap 24, and a first bearing 241 is provided between the output end cap 24 and the end cap fixing part 12. Specifically, the output end cap 24 is provided with an inner step 242 and an outer step 243. The inner step 242 is used to install the first bearing 241, and the outer step 243 is used to install a second bearing 23. The outer periphery of the second bearing 23 is connected to the connecting end cap 4. In this embodiment, the design of the fixed spindle 1, including the stator fixing part 11, the end cap fixing part 12, and the fixed end part 13, ensures the stable installation of the stator assembly 31. By firmly fixing the stator assembly to the stator fixing part, vibration and displacement during operation are effectively reduced, thereby improving the working stability and lifespan of the motor. The inner step 242 of the output end cover 24 provides a precise mounting position for the first bearing 241, while the outer step 243 provides support for the second bearing 23. This ensures proper bearing alignment, reduces friction and wear, effectively distributes the load, and improves the bearing's load-bearing capacity and service life. The synergistic effect of the two bearings makes the motor rotation smoother, reducing noise and energy consumption. The outer periphery of the second bearing 23 connects to the connecting end cover 4, forming a good seal to prevent lubricant leakage and ensure the effectiveness of the internal lubrication system. This protects the internal components of the motor, prevents the intrusion of external contaminants, reduces maintenance frequency, and improves ease of use.

[0023] The end cover fixing part 12 is provided with a first sealing groove 121, and the first sealing groove 121 is provided with a first sealing ring. The first sealing ring is used to seal the first bearing 241 and the inner step 242. Specifically, the outer step 243 is provided with a second sealing groove 244, and the second sealing groove 244 is provided with a second sealing ring. The second sealing ring is used to seal the outer step 243 and the second bearing 23. In this embodiment, the presence of the stator fixing part 11 ensures that the stator assembly 31 maintains good positioning during operation, reduces displacement and wear caused by vibration or impact, enhances the working stability of the motor, and extends its service life. The output end cover 24 is designed with an inner step 242 and an outer step 243. The inner step 242 is used to install the first bearing 241, and the outer step 243 is used to install the second bearing 23. This not only provides double support to ensure the reliability of the output end cover 24, but also effectively distributes the load during operation, reduces the working pressure of a single bearing, and lowers the failure rate. The outer periphery of the second bearing 23 is connected to the connecting end cover 4, allowing for good fit in different operating environments and ensuring stable operation of the motor under various working conditions. This design makes the overall structure more compact, facilitates later maintenance and replacement, and improves the maintainability of the system.

[0024] A bracket 311 is provided on the side of the stator assembly 31 facing the connecting end cover 4. A circuit board 312 is mounted on the bracket 311. The fixed spindle 1 has a wiring hole 14 with a connecting wire 15 for connecting the circuit board 312. In this embodiment, the circuit board 312 on the bracket 311 provides a centralized electrical connection point for motor control and monitoring. By directly integrating the circuit board 312 onto the bracket 311, the length of the cable can be effectively reduced, signal transmission delay and loss can be decreased, and the motor's response speed and control accuracy can be improved. The wiring hole 14 on the fixed spindle 1 provides a reasonable channel for the connecting wire 15, making the circuit connection neater, avoiding cable exposure and tangling, and improving the overall aesthetics. Through the design of the wiring hole 14, maintenance personnel can easily inspect and replace the circuit without disassembling the entire motor assembly, saving maintenance time and costs.

[0025] The connecting end cover 4 is provided with multiple connecting screws 41, and the end of the output housing 2 is provided with connecting holes. These connecting holes are used to engage the connecting screws 41 to fix the connecting end cover 4 to the output housing 2. In this embodiment, the design of multiple connecting screws 41 ensures a strong fixation between the connecting end cover 4 and the output housing 2, effectively resisting vibrations and impacts generated during operation. This multi-point connection method distributes the load, reduces the stress borne by a single screw, thereby reducing the risk of screw loosening or breakage and ensuring the safe operation of the motor. The design of the connecting holes allows for more accurate positioning of the connecting screws 41, ensuring a smooth installation process. Maintenance personnel can quickly disassemble and reassemble the components, facilitating inspection and replacement, helping to shorten maintenance cycles and improve overall work efficiency.

[0026] A hub rubber sheet 25 is provided on the exterior of the output housing 2. The hub rubber sheet 25 covers the output housing 2 and its end abuts against the connecting end cover 4. In this embodiment, the flexible material properties of the hub rubber sheet 25 can absorb and buffer vibrations and impacts during operation, reducing damage to the internal structure of the motor. This buffering effect is particularly important when the motor is running under high load or on uneven roads, helping to maintain the stability and reliability of the motor. The end of the hub rubber sheet 25 abuts against the connecting end cover 4, forming a good sealing effect, preventing internal lubricating oil leakage, and keeping the internal environment of the motor clean and lubricated. This sealing design not only helps to improve the working efficiency of the motor, but also reduces the maintenance frequency and improves the overall ease of use.

[0027] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A hub motor fixing structure, characterized in that: The device includes a fixed spindle, an output housing, an output motor, and a connecting end cover. The output housing has a mounting cavity, and the output motor is mounted inside the mounting cavity. The connecting end cover is located at one end of the mounting cavity and connected to the output housing. The fixed spindle is arranged along the axial direction of the housing. The output motor includes a stator assembly, a rotor housing, and rotor magnets. The stator assembly is mounted on the fixed spindle. The rotor housing is provided with rotor bearings and connected to the fixed spindle. The rotor housing is connected to the output housing to drive the output housing to rotate. The rotor magnets are located on the inner circumference of the rotor housing and are opposite to the stator assembly.

2. The hub motor fixing structure according to claim 1, characterized in that: An output component is provided inside the mounting cavity. The input end of the output component is connected to the rotor housing, and the output end is connected to the output housing. The rotor housing is driven to rotate by the output component.

3. The hub motor fixing structure according to claim 2, characterized in that: The output assembly includes a sun gear, planetary gears, and a ring gear. The sun gear is connected to the rotor housing, the planetary gears mesh with the sun gear, and the ring gear is disposed in the mounting cavity of the output housing and meshes with the planetary gears.

4. The hub motor fixing structure according to claim 1, characterized in that: The fixed spindle includes a stator fixing part, an end cover fixing part, and a fixing end, which are arranged in sequence. The stator fixing part is used to install the stator assembly. One end of the output housing is provided with an output end cover. A first bearing is provided between the output end cover and the end cover fixing part.

5. The hub motor fixing structure according to claim 4, characterized in that: The output end cover is provided with an inner step and an outer step. The inner step is used to install a first bearing, and the outer step is used to install a second bearing. The outer periphery of the second bearing is connected to the connecting end cover.

6. The hub motor fixing structure according to claim 5, characterized in that: The end cap fixing part is provided with a first sealing groove, and the first sealing groove is provided with a first sealing ring. The first sealing ring is used for sealing the first bearing and the inner step.

7. The hub motor fixing structure according to claim 5, characterized in that: The outer step is provided with a second sealing groove, and the second sealing groove is provided with a second sealing ring. The second sealing ring is used to seal between the outer step and the second bearing.

8. The hub motor fixing structure according to claim 4, characterized in that: The stator assembly has a bracket on the side facing the connecting end cover, and a circuit board is mounted on the bracket. The fixed spindle has a wiring hole with a connecting wire for connecting the circuit board.

9. The hub motor fixing structure according to claim 1, characterized in that: The connecting end cover is provided with a plurality of connecting screws, and the end of the output housing is provided with a connecting hole, which is used to engage the connecting screws to fix the connecting end cover to the output housing.

10. The hub motor fixing structure according to claim 1, characterized in that: The output housing is provided with a hub rubber cover on the outside, the hub rubber cover is wrapped around the output housing, and the end of the hub rubber cover abuts against the connecting end cover.

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