In-wheel motor rubber fixing structure

Abstract

The utility model relates to power motor technical field, especially a wheel hub motor rubber skin fixed structure, including motor spindle, output motor, output shell, first end cover, second end cover and wheel hub rubber cover, the output motor sets up on motor spindle and is used for driving output shell rotation, the both ends of motor spindle respectively pass through first end cover and second end cover, the wheel hub rubber cover sets up in the outside of output shell, first end cover and second end cover are set up in the both ends of output shell respectively, and the both ends of wheel hub rubber cover are respectively abutted and fixed. The utility model through first end cover and second end cover respectively abutted and fixed wheel hub rubber cover both ends, realized the reliable positioning of rubber cover in axial and radial, prevented the displacement, warping or falling off due to centrifugal force or impact in operation, thereby guaranteed the stability of drive transmission and the security of power output.

Description

Technical Field

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

[0002] With the rapid development of electric vehicles, in-wheel motors, as a new type of drive technology, have attracted increasing attention due to their high efficiency, compactness, and direct drive characteristics. In-wheel motors integrate the electric motor directly inside the wheel, effectively saving space and improving power transmission efficiency. Their application is becoming increasingly widespread in electric vehicles, scooters, and other electric vehicles, making them an important component of modern electric drive systems.

[0003] However, existing hub motors have shortcomings in securing the hub rubber bushings to the outer hub shell. The hub rubber bushings, as a crucial component connecting the motor and the hub, perform multiple functions, including power transmission, vibration damping, and sealing protection. Current designs often use simple mechanical connections to secure the hub rubber bushings to the hub shell, which are prone to loosening or detachment under high loads, severe vibrations, and temperature changes. Therefore, a new design is needed to address the existing hub motor bushing fixing structure. Utility Model Content

[0004] To solve the above problems, this utility model uses a first end cap and a second end cap to abut and fix the two ends of the hub rubber sleeve, respectively, to achieve reliable positioning of the rubber sleeve in the axial and radial directions. This prevents displacement, warping, or detachment caused by centrifugal force or impact during operation, thereby ensuring the stability of drive transmission and the safety of power output.

[0005] The technical solution adopted by this utility model is: a hub motor rubber fixing structure, including a motor main shaft, an output motor, an output housing, a first end cover, a second end cover, and a hub rubber sleeve. The output motor is mounted on the motor main shaft and is used to drive the output housing to rotate. The two ends of the motor main shaft pass through the first end cover and the second end cover respectively. The hub rubber sleeve is disposed outside the output housing. The first end cover and the second end cover are respectively disposed at both ends of the output housing and respectively abut and fix the two ends of the hub rubber sleeve.

[0006] A further improvement to the above scheme is that a first connecting part and a second connecting part are respectively provided at both ends of the motor spindle. 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 motor 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 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.

[0011] 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 bushing; 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 bushing.

[0012] A further improvement to the above solution is that a first sealing abutment is provided on the outer periphery of the first connecting outer ring, the first sealing abutment is used to abut against the inner periphery of the output housing, and a first guide slope is provided at the end of the first sealing abutment for guiding when the output housing is installed.

[0013] A further improvement to the above solution is that a second sealing abutment is provided on the outer periphery of the second connecting outer ring, the second sealing abutment is used to abut against the inner periphery of the output housing, and a second guide slope is provided at the end of the second sealing abutment for guiding when the output housing is installed.

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

[0015] The beneficial effects of this utility model are: Compared to existing hub motors, this invention uses a first end cap and a second end cap to abut and fix the two ends of the hub bushing, achieving reliable axial and radial positioning of the bushing. This prevents displacement, warping, or detachment caused by centrifugal force or impact during operation, thus ensuring the stability of drive transmission and the safety of power output. The mechanical fixing at both ends replaces simple adhesive bonding, facilitating assembly and disassembly, simplifying maintenance and replacement, and benefiting mass production and subsequent maintenance. The tight fit between the hub bushing and the output housing, along with the sealing structure of the end caps, effectively prevents water, dust, and particles from entering the housing, improving protection levels and corrosion resistance, and extending the service life of the motor and bearings. Simultaneously, the bushing material itself has good elasticity, helping to absorb road vibrations and impacts, reducing operating noise and vibration transmission, improving ride comfort, and reducing component fatigue. This invention balances reliability, maintainability, protection, and vibration and noise control, making it suitable for hub motor applications operating at high speeds and under complex conditions. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the weight reduction structure of the motor housing of this utility model; Figure 2 for Figure 1 Exploded view of the weight reduction structure of the motor casing; Figure 3 for Figure 1 An exploded view of the weight reduction structure of the motor housing from another perspective; Figure 4 for Figure 1 Front view of the weight reduction structure of the motor housing; Figure 5 for Figure 4 Sectional view of AA.

[0017] Explanation of reference numerals in the attached drawings: 1. Motor spindle; 11. First connecting part; 111. First sealing groove; 12. Second connecting part; 121. Second sealing groove; 122. Second connecting step; 13. First bearing; 14. Second bearing; 15. Bushing; 151. First connecting step; 2. Output motor; 2. Connecting end cover; 21. Third connecting step; 211. Third bearing; 212. Third sealing groove; 213. Output housing; 3. First mounting hole; 31. Second mounting hole; 32. First end cover; 4. First connecting outer ring; 411. First sealing abutment; 412. First guide slope; 42. First abutment surface; 5. Second end cover; 51. Second connecting outer ring; 511. Second sealing abutment; 512. Second guide slope; 52. Second abutment surface; 6. Hub rubber sleeve; 61. First contact surface; 62. 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 1-5 As shown, in one embodiment of this utility model, a hub motor rubber sleeve fixing structure is provided, including a motor spindle 1, an output motor 2, an output housing 3, a first end cover 4, a second end cover 5, and a hub rubber sleeve 6. The output motor 2 is mounted on the motor spindle 1 and is used to drive the output housing 3 to rotate. The two ends of the motor spindle 1 pass through the first end cover 4 and the second end cover 5 respectively. The hub rubber sleeve 6 is disposed outside the output housing 3. The first end cover 4 and the second end cover 5 are respectively disposed at both ends of the output housing 3 and respectively abut and fix the two ends of the hub rubber sleeve 6. In this embodiment, by abutting and fixing the two ends of the hub rubber sleeve 6 with the first end cover 4 and the second end cover 5 respectively, reliable positioning of the rubber sleeve in the axial and radial directions is achieved, preventing displacement, warping, or detachment caused by centrifugal force or impact during operation, thereby ensuring the stability of drive transmission and the safety of power output. The mechanical fixing method at both ends replaces the single adhesive bonding, which facilitates assembly and disassembly, simplifies maintenance and replacement, and is beneficial for mass production and later maintenance. The tight fit between the hub bushing 6 and the output housing 3, along with the end cap sealing structure, effectively prevents water, dust, and particles from entering the housing, improving the protection level and corrosion resistance, and extending the service life of the motor and bearings. Simultaneously, the bushing material itself has good elasticity, which helps absorb road vibrations and impacts, reducing operating noise and vibration transmission, improving ride comfort, and reducing component fatigue. This embodiment balances reliability, maintainability, protection, and vibration and noise control, making it suitable for hub motor applications operating at high speeds and under complex conditions.

[0021] The motor spindle 1 has a first connecting part 11 and a second connecting part 12 at both ends. The first connecting part 11 is equipped with a first bearing 13, and the second connecting part 12 is equipped with a second bearing 14. The first bearing 13 is connected to the first end cover 4, and the second bearing 14 is connected to the connecting end cover 21 of the output motor 2. In this embodiment, the first connecting part 11 and the second connecting part 12 at both ends of the motor spindle 1, and the installation of the first bearing 13 and the second bearing 14, respectively, and the connection of the first bearing 13 to the first end cover 4 and the second bearing 14 to the connecting end cover 21 of the output motor 2, enhance the radial and axial support capacity of the spindle, ensure the coaxiality and positioning accuracy of the spindle relative to the output housing 3 and the end cover, reduce sway and vibration, thereby reducing the periodic stress and local wear on the hub bushing 6, and extending the service life of the bushing and bearings. The support of the bearings at both ends reasonably distributes external loads, such as road impact, lateral force and torque, to the end cover and motor end structure, reducing the load on the bushing and preventing the bushing from shearing or dislodging. The rigid connection between the bearing and the end cover also facilitates axial pre-tightening or self-aligning of the spindle, improving the rotor's dynamic stability and high-speed operation reliability.

[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 sealing grooves and sealing rings on the outer periphery of the first connecting part 11 and the second connecting part 12 can form a reliable static / dynamic seal between the outer diameter of the connecting part and the inner periphery of the bearing, significantly preventing external contaminants such as water, dust, mud, and chemical media from entering the bearing cavity or the interior of the output housing 3, while effectively retaining grease and preventing lubricant leakage. This can reduce wear and premature failure caused by bearing contamination and insufficient lubrication, extend the service life of the bearing and hub bushing 6, and reduce maintenance frequency and repair costs. The sealing ring is positioned within the sealing groove, making it difficult for it to move or fall off. It is easy to assemble and can compensate for poor contact caused by manufacturing tolerances and minor vibrations, maintaining long-term stable sealing performance.

[0023] A bushing 15 is provided at one end of the motor 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 located on the first connecting step 151, and the second connecting step 122 is located on the second connecting part 12. In this embodiment, the bushing 15 at one end of the motor spindle 1 forms the first connecting step 151, and the second connecting part 12 has the second connecting step 122. The first bearing 13 is mounted on the first connecting step 151, which enables precise radial and axial positioning of the bearing. The step, as a rigid positioning shoulder, provides stable end face support for the bearing, avoiding axial displacement and clearance changes, thereby improving rotor coaxiality and rotational stability, reducing runout and vibration, and extending the service life of the bearing, hub bushing 6, and related seals. The bushing 15, as a replaceable load-bearing and positioning component, can be reliably assembled through transition fit or interference fit, reducing machining requirements and damage to the spindle body, facilitating later maintenance and replacement, and reducing maintenance costs. The stepped structure also facilitates the control of axial preload or axial clearance, optimizes bearing load and lubrication conditions, reduces stress concentration in rolling elements, and improves reliability under high-speed conditions.

[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 5 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 and the third bearing 212 are arranged on the connecting end cover 21 of the output motor 2, so that the third bearing 212 is reliably connected to the inner circumference of the second end cover 5. This forms another rigid and precise axial and radial support point between the motor end and the hub structure, thereby significantly improving the coaxiality and positioning accuracy of the main shaft and the machine housing, evenly distributing torque, radial load and impact load, reducing the periodic shear and local stress concentration borne by the hub rubber, reducing the risk of rubber fatigue, tearing or dislocation, and extending the life of the rubber and bearing. The step positioning on the third connecting step 211 is beneficial for controlling axial clearance and achieving axial preload, improving the bearing stress state and lubrication conditions, and improving the rotor dynamic balance and high-speed operation reliability. The third sealing ring in the third sealing groove 213 can establish a reliable seal between the outer periphery of the step and the bearing, preventing external pollutants such as water, mud, and salt spray from entering the bearing cavity. At the same time, it effectively retains grease and inhibits lubricant leakage, thereby reducing wear, corrosion and noise, and improving the overall protection level and durability of the machine.

[0025] The output housing 3 has a first mounting hole 31 and a second mounting hole 32 at both ends. The first end cover 4 is fixed to the first mounting hole 31 and the second mounting hole 32 by screws. In this embodiment, the screw connection ensures the precise positioning and rigid fit between the end cover and the housing, maintains the relative position stability of the bearing, step, and rubber fixing parts, avoids axial clearance and radial eccentricity, thereby improving rotor coaxiality and reducing vibration and uneven wear. Controllable screw preload allows for uniform compression of the rubber and seals, preventing loosening, warping, or dislocation of the rubber, improving sealing performance, and suppressing grease leakage, significantly improving the overall waterproof and dustproof rating and long-term reliability of the machine. The screw connection offers good disassembly and maintainability, facilitating the inspection and replacement of the end cover, bearing, or rubber, reducing maintenance time and costs; at the same time, standardized fasteners facilitate batch assembly, controllable torque, and improved production consistency.

[0026] The first end cap 4 is provided with a first connecting outer ring 41 and a first abutting surface 42. The first connecting outer ring 41 is connected to one end of the output housing 3, and the first abutting surface 42 is used to abut one end of the hub bushing 6. The second end cap 5 is provided with a second connecting outer ring 51 and a second abutting surface 52. The second connecting outer ring 51 is connected to the other end of the output housing 3, and the second abutting surface 52 is used to abut the other end of the hub bushing 6. In this embodiment, the first end cap 4 and the second end cap 5 are respectively provided with connecting outer rings and abutting surfaces, and are rigidly connected to both ends of the output housing 3 through the connecting outer rings, so that both ends of the hub bushing 6 can reliably abut against the abutting surfaces of the end caps, thereby achieving precise axial positioning and stable support in the rubber fixing structure. The abutting surface directly bears the end of the bushing, which can evenly distribute the axial clamping force, prevent the rubber from slipping, warping, or axially displacing during operation, and reduce the risk of local stress concentration and fatigue cracking; at the same time, the controllable clamping state improves the sealing performance, inhibits grease leakage and external contaminant intrusion, and helps to extend the life of the rubber and bearing. The rigid connection between the outer ring and the outer shell improves the fitting accuracy between the end cover and the shell, which helps maintain rotor coaxiality, reduce vibration and noise, and improve running smoothness.

[0027] A first sealing abutment portion 411 is provided on the outer periphery of the first connecting outer ring 41. The first sealing abutment portion 411 is used to abut against the inner periphery of the output housing 3. A first guide slope 412 is provided at the end of the first sealing abutment portion 411 for guiding when the output housing 3 is installed. In this embodiment, the fit between the sealing abutment portion and the inner periphery of the housing forms a first mechanical sealing surface, which can establish a reliable radial and axial seal between the end cover and the housing, preventing water, dust, sand and corrosive media from entering the cavity, while preventing grease leakage, thereby improving the protection level of the whole machine and the service life of bearings and rubber sleeves. The guide slope at the end plays a self-positioning and guiding role during the assembly process, reducing the difficulty of centering and the risk of jamming during insertion, making it easier and smoother for the end cover to be installed into the housing, reducing assembly force and the possibility of misinstallation.

[0028] A second sealing abutment portion 511 is provided on the outer periphery of the second connecting outer ring 51. The second sealing abutment portion 511 is used to abut against the inner periphery of the output housing 3. A second guide slope 512 is provided at the end of the second sealing abutment portion 511 for guiding when the output housing 3 is inserted. In this embodiment, the fit between the second sealing abutment portion 511 and the inner periphery of the output housing 3 forms a reliable sealing contact surface, which, together with the sealing at the first end, achieves a double seal at the end, effectively preventing external pollutants such as water, dust, and mud from entering. The second guide slope 512 provides a smooth self-guiding function during assembly, reducing the difficulty of centering and the risk of jamming during insertion, reducing assembly force and the probability of misinstallation, which is conducive to assembly automation and improving production efficiency. The second sealing abutment portion 511 can compensate for the relative displacement caused by manufacturing tolerances and thermal expansion, maintain a long-term stable compression and sealing state, reduce stress concentration and the risk of seal extrusion, and enhance vibration and impact resistance.

[0029] The hub bushing 6 has a first contact surface 61 and a second contact surface 62 at both ends. The first contact surface 61 is in sealing contact with the first end cap 4, and the second contact surface 62 is in sealing contact with the second end cap 5. In this embodiment, the bushing is precisely axially positioned and reliably supported, preventing axial displacement or slippage of the rubber during operation, ensuring the coaxiality of the hub and motor output, and reducing uneven bearing load and vibration. The sealing contact at both ends forms a double sealing structure, improving sealing performance and lubrication retention, and extending the service life of the bearing and bushing. The contact surfaces can evenly distribute axial load, reduce local stress concentration and rubber edge warping, reduce the risk of fatigue cracking, and enhance impact and vibration resistance.

[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 rubber fixing structure, characterized in that: The device includes a motor spindle, an output motor, an output housing, a first end cover, a second end cover, and a hub bushing. The output motor is mounted on the motor spindle and is used to drive the output housing to rotate. The two ends of the motor spindle pass through the first end cover and the second end cover, respectively. The hub bushing is located outside the output housing. The first end cover and the second end cover are located at the two ends of the output housing, respectively, and abut and fix the two ends of the hub bushing.

2. The hub motor rubber fixing structure according to claim 1, characterized in that: The motor spindle is provided with a first connecting part and a second connecting part at both ends. 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 rubber fixing structure 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 rubber fixing structure according to claim 2, characterized in that: A bushing is provided at one end of the motor 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 rubber fixing structure according to claim 1, 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 rubber fixing structure according to claim 1, 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.

7. The hub motor rubber fixing structure according to claim 1, 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 bushing. 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 bushing.

8. The hub motor rubber fixing structure according to claim 7, characterized in that: The outer periphery of the first connecting outer ring is provided with a first sealing abutment portion, which is used to abut against the inner periphery of the output housing. The end of the first sealing abutment portion is provided with a first guide slope for guiding when the output housing is installed.

9. The hub motor rubber fixing structure according to claim 7, characterized in that: The outer periphery of the second connecting outer ring is provided with a second sealing abutment part, which is used to abut against the inner periphery of the output housing. The end of the second sealing abutment part is provided with a second guide slope for guiding when the output housing is installed.

10. The hub motor rubber fixing structure according to claim 1, characterized in that: The wheel hub bushing has a first contact surface and a second contact surface at both ends. The first contact surface is in sealing contact with the first end cap, and the second contact surface is in sealing contact with the second end cap.

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