wheel hub motor

Abstract

The utility model relates to power motor technical field, especially a wheel hub motor, including fixed main shaft, output motor, transmission assembly, output box and wheel hub rubber, be provided with the accommodation cavity in the output box, the output motor sets up in the accommodation cavity, transmission assembly sets up in the accommodation cavity and is connected with the output end of output motor, be provided with transmission connecting ring in the accommodation cavity, transmission connecting ring is connected with transmission assembly, the output motor is used for driving transmission assembly transmission to drive output box rotation, fixed main shaft sets up at the axle center department of output box, and passes through output motor and transmission assembly in proper order, wheel hub rubber sets up at the outside of output box, the utility model has obvious technical advantage in reliable transmission, high degree of integration, environmental protection, maintenance convenient and production controllability etc.

Description

Technical Field

[0001] This utility model relates to the field of power motor technology, and in particular to a hub motor. 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 space saving and improved power transmission efficiency. However, existing in-wheel motors still face some challenges in terms of the stability of the internally integrated motor and its space requirements. The motor integrated inside the in-wheel motor needs to withstand various external forces and vibrations generated during vehicle operation, thus testing the installation stability of the motor within the wheel hub. Existing fixing methods are susceptible to uneven distribution of dynamic loads, leading to motor displacement or loosening during operation, thereby reducing the motor's efficiency and lifespan.

[0003] While integrated motor designs offer advantages in space utilization, the size of the motor and the layout of its internal components often complicate the overall structure of the hub motor, resulting in a larger footprint and impacting transmission stability. Therefore, new designs are necessary for existing hub motors. Utility Model Content

[0004] To address the aforementioned issues, this invention offers significant technical advantages in terms of reliable transmission, high integration, environmental protection, convenient maintenance, and production controllability, making it suitable for hub motors requiring high reliability and high integration.

[0005] The technical solution adopted by this utility model is as follows: a hub motor, including a fixed main shaft, an output motor, a transmission assembly, an output housing, and a hub rubber sheet. The output housing has a mounting cavity, the output motor is mounted within the mounting cavity, the transmission assembly is mounted within the mounting cavity and connected to the output end of the output motor, and a transmission connecting ring is provided within the mounting cavity, which is connected to the transmission assembly. The output motor drives the transmission assembly to rotate the output housing. The fixed main shaft is located at the axis of the output housing and passes sequentially through the output motor and the transmission assembly. The hub rubber sheet is located outside the output housing.

[0006] A further improvement to the above solution is that the output housing includes an output outer shell, a first end cover, and a second end cover. The first end cover and the second end cover are respectively disposed at both ends of the output outer shell. The mounting cavity is disposed inside the output outer shell. The two ends of the fixed spindle are respectively provided with a first connecting part and a second connecting part. The first connecting part is provided with a first bearing, and the second connecting part is provided with a second bearing. The first bearing is connected to the first end cover, and the second bearing is connected to the connecting end cover of the output motor.

[0007] A further improvement to the above solution is that a first sealing groove is provided on the outer periphery of the first connecting part, and a first sealing ring is provided on the first sealing groove. The first sealing ring is used to seal the outer diameter of the first connecting part with the inner periphery of the first bearing. A second sealing groove is provided on the outer periphery of the second connecting part, and a second sealing ring is provided on the second sealing groove. The second sealing ring is used to seal the outer diameter of the second connecting part with the inner periphery of the second bearing.

[0008] A further improvement to the above scheme is that a bushing is provided at one end of the fixed spindle, the bushing is provided with a first connecting step, the second connecting part is provided with a second connecting step, the first bearing is provided on the first connecting step, and the second connecting step is provided on the second connecting part.

[0009] A further improvement to the above scheme is that the connecting end cover of the output motor is provided with a third connecting step, a third bearing is provided on the third connecting step, and the inner circumference of the second end cover is connected to the third bearing; a third sealing groove is provided on the outer circumference of the third connecting step, and a third sealing ring is provided in the third sealing groove.

[0010] A further improvement to the above scheme is that the output motor includes a stator assembly, a rotor housing, and rotor magnets. The stator assembly is mounted on a fixed main shaft. The rotor housing is provided with a rotor bearing and connected to the fixed main shaft. The rotor magnets are mounted on the rotor housing and are opposite to the stator assembly. The connecting end cover is located at one end of the rotor housing.

[0011] A further improvement to the above solution is that the stator assembly is provided with a bracket, the bracket is provided with a circuit board, the fixed spindle is provided with a wiring hole, one end of the wiring hole extends into the rotor housing and is used to connect the wiring to the circuit board.

[0012] A further improvement to the above solution is that the two ends of the output housing are respectively provided with a first mounting hole and a second mounting hole, the first end cover is fixed to the first mounting hole by screws, and the first end cover is fixed to the second mounting hole by screws.

[0013] A further improvement to the above solution is that the first end cap is provided with a first connecting outer ring and a first abutting surface, the first connecting outer ring is connected to one end of the output housing, and the first abutting surface is used to abut one end of the wheel hub rubber; the second end cap is provided with a second connecting outer ring and a second abutting surface, the second connecting outer ring is connected to the other end of the output housing, and the second abutting surface is used to abut the other end of the wheel hub rubber.

[0014] A further improvement to the above solution is that the two ends of the wheel hub rubber are respectively provided with a first bonding surface and a second bonding surface, the first bonding surface sealingly abutting against the first end cap, and the second bonding surface sealingly abutting against the second end cap.

[0015] The beneficial effects of this utility model are: Compared to existing hub motors, this invention integrates the output motor and transmission components within the output housing cavity, using a fixed main shaft as the central support. A transmission connecting ring ensures a reliable connection between the transmission components and the output housing. This co-location of the output motor and transmission components fully utilizes the radial space within the housing, shortens the axial dimension, and reduces the space occupied by external transmission components and assembly. This facilitates vehicle layout and miniaturization, enabling platform-based production and modular replacement. The transmission connecting ring, acting as a force-bearing and transmission intermediary, disperses transmission stress, reduces stress concentration, and ensures concentricity and stability of torque transmission, thereby improving fatigue life and load-bearing capacity. The fixed main shaft, as a static support, avoids complex axial force variations caused by wheel rotation, enhancing overall rigidity and impact resistance. The output motor and transmission components are enclosed within the output housing cavity, with the external hub rubber further protecting against external media, facilitating high-level protection, extending the lifespan of critical components, and improving reliable operation under harsh conditions. The coupling design between the output housing and the external wheel hub rubber effectively isolates vibration and buffers impacts and vibrations from the road surface. The transmission connecting ring and precise fit reduce transmission backlash and gear noise, thereby reducing overall operating noise and vibration transmission, and improving driving comfort and quietness. This invention has significant technical advantages in terms of reliable transmission, high integration, environmental protection, convenient maintenance, and production controllability, making it suitable for high reliability and high integration requirements. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the hub motor of this utility model; Figure 2 for Figure 1 An exploded diagram of a hub motor; Figure 3 for Figure 1 An exploded view of the in-wheel motor from another perspective; Figure 4 for Figure 1Front view of the in-wheel hub motor; Figure 5 for Figure 4 Sectional view of AA; Figure 6 for Figure 1 A schematic diagram of the output motor of the in-wheel hub motor.

[0017] Explanation of reference numerals in the attached drawings: Fixed spindle 1, First connecting part 11, First sealing groove 111, Second connecting part 12, Second sealing groove 121, Second connecting step 122, First bearing 13, Second bearing 14, Bushing 15, First connecting step 151, Wiring hole 16, Output motor 2, Connecting end cover 21, Third connecting step 211, Third bearing 212, Third sealing groove 213, Stator assembly 22, Bracket 221, Circuit board 222, Rotor housing 23, Rotor magnet 24, Transmission assembly 3, Sun gear 31, Planetary gear 32, Output housing 4, Housing cavity 41, Transmission connecting ring 411, Output housing 42, First mounting hole 421, Second mounting hole 422, First end cover 43, First connecting outer ring 431, First abutting surface 432, Second end cover 44, Second connecting outer ring 441, Second abutting surface 442, Hub rubber 5, First contact surface 51, Second contact surface 52. 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 1-6As shown, in one embodiment of this utility model, a hub motor is disclosed, including a fixed main shaft 1, an output motor 2, a transmission assembly 3, an output housing 4, and a hub rubber 5. The output housing 4 has a mounting cavity 41, the output motor 2 is mounted within the mounting cavity 41, and the transmission assembly 3 is mounted within the mounting cavity 41 and connected to the output end of the output motor 2. A transmission connecting ring 411 is provided within the mounting cavity 41 and is connected to the transmission assembly 3. The output motor 2 drives the transmission assembly 3 to rotate the output housing 4. The fixed main shaft 1 is located at the axis of the output housing 4 and passes sequentially through the output motor 2 and the transmission assembly 3. The hub rubber 5 is located outside the output housing 4. This embodiment achieves a reliable connection between the transmission components and the output housing 4 by mounting the output motor 2 and the transmission assembly 3 together within the mounting cavity 41 of the output housing 4, with the fixed main shaft 1 serving as the central through-support, and by using the transmission connecting ring 411. The output motor 2 and transmission assembly 3 are housed in the same compartment, making full use of the radial space within the housing, shortening the axial dimension, and reducing the space occupied by external transmission components and assembly. This is beneficial for overall vehicle layout and miniaturization design, facilitating platform-based production and modular replacement. The transmission connecting ring 411, acting as an intermediary for load bearing and transmission, disperses transmission stress, reduces stress concentration, and ensures the concentricity and stability of torque transmission, thereby improving fatigue life and load-bearing capacity. The fixed main shaft 1, as a static support, avoids complex axial force variations caused by the rotation of the transmission shaft with the wheels, enhancing overall rigidity and impact resistance. The output motor 2 and transmission assembly 3 are enclosed within the housing cavity 41 of the output housing 4, and the external wheel hub rubber 5 further protects against external media, facilitating high-level protection, extending the life of critical components, and improving reliable operation under harsh conditions. The coupling design between the output housing 4 and the external wheel hub rubber 5 effectively isolates vibration and buffers impacts and vibrations from the road surface. The precise fit of the transmission connecting ring 411 reduces transmission clearance and backlash noise, resulting in overall reduced operating noise and vibration transmission, improving driving comfort and quietness. This implementation has significant technical advantages in terms of reliable transmission, high integration, environmental protection, convenient maintenance, and production controllability, making it suitable for requirements of high reliability and high integration.

[0021] The output housing 4 includes an output outer shell 42, a first end cover 43, and a second end cover 44. The first end cover 43 and the second end cover 44 are respectively disposed at both ends of the output outer shell 42. The mounting cavity 41 is disposed inside the output outer shell 42. The two ends of the fixed spindle 1 are respectively provided with a first connecting part 11 and a second connecting part 12. The first connecting part 11 is provided with a first bearing 13, and the second connecting part 12 is provided with a second bearing 14. The first bearing 13 is connected to the first end cover 43, and the second bearing 14 is connected to the connecting end cover 21 of the output motor 2. In this embodiment, the output outer shell 42 and the two end covers are fitted together to form a closed mounting cavity 41, and the two ends of the fixed spindle 1 are supported and fixed by the first and second bearings 14 respectively. The two ends are positioned and supported by the end covers through the first and second bearings 14, which improves the radial and axial stiffness of the spindle, reduces shaft bending and eccentricity, and ensures the concentricity of the transmission assembly 3 and the motor, thereby improving the smoothness of torque transmission and extending the life of the transmission components. The end cap and housing form a closed cavity, facilitating sealing measures and the injection of lubricating media to prevent the intrusion of external water, dust, and contaminants, thereby improving the system's protection level and reliability under harsh operating conditions. The enclosed mounting cavity 41 allows for the centralized arrangement of heat dissipation paths or cooling interfaces, and the rigid structure of the end cap and housing helps suppress the transmission of vibrations in the drive and motor. The end cap structure facilitates bearing preloading, concentricity adjustment, and sealing checks on the assembly line; the standardized arrangement of the end cap and bearings also facilitates subsequent maintenance and replacement, shortening maintenance time and reducing costs.

[0022] A first sealing groove 111 is provided on the outer periphery of the first connecting part 11, and a first sealing ring is provided on the first sealing groove 111. The first sealing ring is used to seal the outer diameter of the first connecting part 11 with the inner periphery of the first bearing 13. A second sealing groove 121 is provided on the outer periphery of the second connecting part 12, and a second sealing ring is provided on the second sealing groove 121. The second sealing ring is used to seal the outer diameter of the second connecting part 12 with the inner periphery of the second bearing 14. In this embodiment, the first sealing ring and the second sealing ring are located on the outer periphery of the first connecting part 11 and the second connecting part 12, respectively, forming a good sealing barrier. This design can prevent dust, moisture and other contaminants from entering the bearing, thereby reducing bearing wear and corrosion, significantly extending the bearing's service life and improving the reliability of the hub motor. The presence of the sealing ring effectively prevents grease leakage, ensuring that the lubricant can be evenly distributed in the bearing, maintaining the bearing's good lubrication condition. It reduces friction and heat generation, also reduces energy consumption, and improves the overall working efficiency of the motor. The design of the sealing groove provides reliable positioning for the sealing ring, making it less likely to shift or fall off during assembly.

[0023] A bushing 15 is provided at one end of the fixed spindle 1. The bushing 15 has a first connecting step 151, and the second connecting part 12 has a second connecting step 122. The first bearing 13 is disposed on the first connecting step 151, and the second connecting step 122 is disposed on the second connecting part 12. In this embodiment, the first connecting step 151 of the bushing 15 provides a robust and stable support surface for the first bearing 13, ensuring that the bearing can effectively withstand radial and axial loads during operation. This reduces bearing deformation caused by loads, thereby improving the transmission accuracy and stability of the entire machine. The second connecting step 122 on the second connecting part 12 provides a positioning surface for the second bearing 14, facilitating accurate alignment and positioning during assembly. During assembly, the mechanical fit of the steps allows for quick determination of the bearing's installation position, reducing assembly errors.

[0024] The connecting end cover 21 of the output motor 2 is provided with a third connecting step 211, on which a third bearing 212 is provided. The inner circumference of the second end cover 44 is connected to the third bearing 212. The outer circumference of the third connecting step 211 is provided with a third sealing groove 213, on which a third sealing ring is provided. In this embodiment, the third connecting step 211 provides a robust support surface for the third bearing 212, ensuring the stability of the bearing during operation. It can effectively withstand radial and axial forces from the load, reducing bearing deformation and wear, thereby improving the transmission accuracy and reliability of the motor. The combination of the third sealing groove 213 on the outer circumference of the third connecting step 211 and the third sealing ring forms an effective sealing structure, preventing lubricant leakage and the intrusion of external contaminants.

[0025] The output motor 2 includes a stator assembly 22, a rotor housing 23, and rotor magnets 24. The stator assembly 22 is mounted on a fixed spindle 1. The rotor housing 23 is provided with a rotor bearing and connected to the fixed spindle 1. The rotor magnets 24 are mounted on the rotor housing 23 and opposite to the stator assembly 22. A connecting end cap 21 is provided at one end of the rotor housing 23. Specifically, the stator assembly 22 is provided with a bracket 221, on which a circuit board 222 is mounted. The fixed spindle 1 is provided with a wiring hole 16, one end of which extends into the rotor housing 23 and is used to connect wires to the circuit board 222. In this embodiment, the stator assembly 22 is fixed to the spindle by the bracket 221, and the rotor housing 23 is connected to the rotor bearing and surrounds the rotor magnets 24. The compact structural design effectively saves space and reduces the overall system volume. It can better adapt to limited installation space and improve the design flexibility of the vehicle. The circuit board 222 on the stator assembly 22 is connected to the fixed spindle 1 through a wiring hole 16. One end of the wiring hole 16 extends into the rotor housing 23, forming a direct electrical connection. This design not only simplifies the layout of the electrical connections and reduces the number of connecting wires, thus reducing the potential risk of contact failure, but also effectively reduces electrical interference, ensuring stable operation of the motor under high load and high speed.

[0026] The output housing 42 has a first mounting hole 421 and a second mounting hole 422 at both ends. The first end cover 43 is fixed to the first mounting hole 421 and the second end cover 44 is fixed to the second mounting hole 422 with screws. In this embodiment, by providing mounting holes at both ends of the output housing 42 and fixing the first end cover 43 and the second end cover 44 with screws, this structure ensures a firm connection of the overall assembly. A stable connection can effectively resist vibration and impact generated during operation, reduce relative displacement between components, thereby reducing the risk of failure caused by improper installation and improving the reliability of the motor. The screw fixing design makes the installation process simpler and more efficient. Workers only need to align the mounting holes and fix them with screws during assembly, avoiding complex connection methods and improving assembly efficiency. At the same time, if maintenance or replacement of parts is required, the disassembly process is also relatively simple, reducing maintenance time and costs and improving the maintainability of the equipment.

[0027] The first end cap 43 is provided with a first connecting outer ring 431 and a first abutting surface 432. The first connecting outer ring 431 is connected to one end of the output housing 42, and the first abutting surface 432 is used to abut one end of the wheel hub rubber 5. The second end cap 44 is provided with a second connecting outer ring 441 and a second abutting surface 442. The second connecting outer ring 441 is connected to the other end of the output housing 42, and the second abutting surface 442 is used to abut the other end of the wheel hub rubber 5. In this embodiment, the first connecting outer ring 431 is connected to one end of the output housing 42, and the second connecting outer ring 441 is connected to the other end of the output housing 42, ensuring a stable connection between the end cap and the output housing 42. The connection of the outer rings can effectively disperse the impact and vibration from the operation process, reduce the risk of failure due to poor connection, and thus improve the overall reliability of the motor. The first abutting surface 432 and the second abutting surface 442 are respectively used to abut the two ends of the wheel hub rubber 5, ensuring good contact between the rubber sleeve and the end cap, and enhancing the efficiency of power transmission. Good contact performance can reduce energy loss, improve the output efficiency of the motor, and ensure better power response of the vehicle during operation.

[0028] The wheel hub rubber 5 has a first contact surface 51 and a second contact surface 52 at both ends. The first contact surface 51 is in sealed contact with the first end cap 43, and the second contact surface 52 is in sealed contact with the second end cap 44. In this embodiment, by sealing the first contact surface 51 with the first end cap 43 and the second contact surface 52 with the second end cap 44, the good sealing contact between the first contact surface 51 and the second contact surface 52 can optimize the power transmission between the rubber and the end cap. The contact design reduces energy loss, allowing the motor to transmit power to the wheel hub more quickly during operation, improving the vehicle's acceleration performance and response speed, and enhancing the overall driving experience. As a component of the flexible connection, the wheel hub rubber 5 can effectively absorb and buffer vibrations and impacts from the road surface. Through the sealed contact with the end cap, the rubber can better utilize its elastic properties, reducing vibration transmission to the motor, thereby protecting the motor components and extending their service life.

[0029] The transmission connecting ring 411 is an internal gear ring. The transmission assembly 3 includes a sun gear 31 and a planetary gear 32. The sun gear 31 is connected to the rotor housing 23. The planetary gear 32 meshes with the sun gear 31. The outer diameter of the planetary gear 32 meshes with the transmission connecting ring 411.

[0030] 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, characterized in that: The device includes a fixed spindle, an output motor, a transmission assembly, an output housing, and a hub rubber cover. The output housing has a mounting cavity, the output motor is housed within this cavity, and the transmission assembly is also housed within the cavity and connected to the output end of the output motor. A transmission connecting ring is located within the mounting cavity and connected to the transmission assembly. The output motor drives the transmission assembly to rotate the output housing. The fixed spindle is positioned at the center of the output housing and passes sequentially through the output motor and the transmission assembly. The hub rubber cover is located on the outside of the output housing.

2. The hub motor according to claim 1, characterized in that: The output housing includes an output outer shell, a first end cover, and a second end cover. The first end cover and the second end cover are respectively disposed at both ends of the output outer shell. The mounting cavity is disposed inside the output outer shell. The two ends of the fixed spindle are respectively provided with a first connecting part and a second connecting part. The first connecting part is provided with a first bearing, and the second connecting part is provided with a second bearing. The first bearing is connected to the first end cover, and the second bearing is connected to the connecting end cover of the output motor.

3. The hub motor according to claim 2, characterized in that: The outer periphery of the first connecting part is provided with a first sealing groove, and a first sealing ring is provided on the first sealing groove. The first sealing ring is used to seal the outer diameter of the first connecting part with the inner periphery of the first bearing. The outer periphery of the second connecting part is provided with a second sealing groove, and a second sealing ring is provided on the second sealing groove. The second sealing ring is used to seal the outer diameter of the second connecting part with the inner periphery of the second bearing.

4. The hub motor according to claim 3, characterized in that: A bushing is provided at one end of the fixed spindle, the bushing is provided with a first connecting step, the second connecting part is provided with a second connecting step, the first bearing is provided on the first connecting step, and the second connecting step is provided on the second connecting part.

5. The hub motor according to claim 2, characterized in that: The output motor's connecting end cover is provided with a third connecting step, and a third bearing is provided on the third connecting step. The inner circumference of the second end cover is connected to the third bearing. The outer circumference of the third connecting step is provided with a third sealing groove, and a third sealing ring is provided in the third sealing groove.

6. The hub motor according to claim 5, characterized in that: The output motor includes a stator assembly, a rotor housing, and rotor magnets. The stator assembly is mounted on a fixed main shaft. The rotor housing is provided with a rotor bearing and connected to the fixed main shaft. The rotor magnets are mounted on the rotor housing and are opposite to the stator assembly. The connecting end cover is located at one end of the rotor housing.

7. The hub motor according to claim 6, characterized in that: The stator assembly is provided with a bracket, and a circuit board is provided on the bracket. The fixed spindle is provided with a wiring hole, one end of which extends into the rotor housing and is used to connect the wiring to the circuit board.

8. The hub motor according to claim 2, characterized in that: The output housing is provided with a first mounting hole and a second mounting hole at both ends, and the first end cover is fixed to the first mounting hole by screws and the second mounting hole by screws.

9. The hub motor according to claim 2, characterized in that: The first end cap is provided with a first connecting outer ring and a first abutting surface. The first connecting outer ring is connected to one end of the output housing, and the first abutting surface is used to abut one end of the wheel hub rubber. The second end cap is provided with a second connecting outer ring and a second abutting surface. The second connecting outer ring is connected to the other end of the output housing, and the second abutting surface is used to abut the other end of the wheel hub rubber.

10. The hub motor according to claim 2, characterized in that: The wheel hub rubber is provided with a first bonding surface and a second bonding surface at both ends. The first bonding surface is sealed and abuts against the first end cap, and the second bonding surface is sealed and abuts against the second end cap.

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