Hub motor based on a non-stripped shell

Abstract

The utility model relates to power motor technical field, especially a kind of hub motor based on no rib shell, including shell body and the drive motor, fixed base and transmission assembly being set in shell body, the outer periphery of shell body is annular surface, drive motor is set in fixed base and is used to transmission assembly, to drive shell body rotation;Shell body is provided with placement cavity, and placement cavity includes drive cavity and transmission connecting cavity;Thickening portion is arranged on the outside of drive cavity of shell body, and thickening portion is provided with multiple lightening grooves, multiple lightening grooves are evenly distributed with drive cavity as axis, reinforcing rib is set between adjacent two lightening grooves, and mounting hole is set on reinforcing rib.The utility model is arranged on the outside of drive cavity of shell body with thickening portion that multiple lightening grooves are evenly distributed, under the premise of guaranteeing the overall structural strength and rigidity of shell, effectively reduce the overall weight of motor.

Description

Technical Field

[0001] This utility model relates to the field of power motor technology, and in particular to a hub motor based on a ribless housing. Background Technology

[0002] In recent years, with the rapid development of electric vehicles such as electric cars, electric bicycles, and electric scooters, hub motors, as the core component that directly drives the wheels, have been widely used due to their advantages such as compact structure, high transmission efficiency, and flexible layout. However, the housing of traditional hub motors is usually manufactured by casting or welding, with reinforcing ribs on the inside of the housing to improve structural strength. While this design ensures a certain degree of rigidity, it also brings problems such as large overall weight, high rotational inertia, and limited heat dissipation performance, affecting the motor's power density, dynamic response capability, and energy efficiency.

[0003] Especially with the increasingly stringent industry trend towards lightweighting, effectively reducing the weight of the motor housing while ensuring sufficient strength and stability has become a key challenge in the structural design of hub motors. Furthermore, traditional ribbed structures are prone to vibration and noise due to stress concentration at high speeds, and their low internal space utilization hinders the efficient integration of the motor drive unit, transmission unit, and control unit.

[0004] On the other hand, hub motors typically need to accommodate the drive motor, reduction gear mechanism, and circuit control module within a limited space. Therefore, rationally dividing the internal cavity, optimizing the power transmission path, and improving heat dissipation efficiency are crucial issues for enhancing overall performance and reliability. Current technologies often employ uniform wall thickness or simple thickening to handle loads, lacking targeted lightweighting and localized reinforcement designs, making it difficult to balance weight, strength, and functional expandability. Therefore, a novel hub motor housing structure is urgently needed that can achieve lightweighting while ensuring overall rigidity, installation stability, and environmental adaptability, meeting the application requirements of high-performance electric vehicles. Utility Model Content

[0005] To solve the above problems, this utility model provides a hub motor based on a ribless housing by setting a thickened part with multiple weight-reducing grooves evenly distributed in a circumferential direction on the outside of the housing body located on the drive cavity. This effectively reduces the overall weight of the motor while ensuring the overall structural strength and rigidity of the housing.

[0006] The technical solution adopted by this utility model is as follows: a hub motor based on a ribless shell, including a shell body and a drive motor, a fixed base, and a transmission assembly disposed within the shell body. The outer periphery of the shell body is an annular surface. The transmission assembly is disposed on the fixed base, and the drive motor is disposed on the fixed base and used by the transmission assembly to drive the shell body to rotate. The shell body is provided with a mounting cavity, which includes a drive cavity and a transmission connection cavity. The drive motor is disposed within the drive cavity, and the transmission connection cavity is provided with a rotary connecting element and connected to the fixed base through the rotary connecting element. The shell body is provided with a thickened portion outside the drive cavity. The thickened portion is provided with multiple weight-reducing grooves, which are evenly distributed circumferentially around the drive cavity as the axis. A reinforcing rib is provided between two adjacent weight-reducing grooves, and the reinforcing rib is provided with mounting holes.

[0007] A further improvement to the above solution is that a sealing flange is provided at the port of the mounting cavity of the outer shell body, the inner wall of the sealing flange is flush with the inner wall of the mounting cavity, a sealing groove is formed between the inner wall of the sealing flange and the outer periphery of the fixing base, and a sealing element is provided in the sealing groove for sealing between the sealing flange and the fixing base.

[0008] A further improvement to the above scheme is that the sealing flange has an inner chamfer and an outer chamfer on both sides of its end.

[0009] A further improvement to the above scheme is that a retaining ring groove is provided on the side of the mounting cavity near the sealing flange, and a retaining ring is installed on the retaining ring groove. The upper surface of the retaining ring forms a right angle with the inner circumference of the sealing flange, and the upper surface of the retaining ring is used to support the sealing element.

[0010] A further improvement to the above solution is that the sealing element includes an outer sealing lip and an inner sealing lip. The outer sealing lip is used to seal against the inner wall of the sealing flange, and the inner sealing lip has an S-shaped cross section and is used to abut against the outer periphery of the fixed base.

[0011] A further improvement to the above solution is that the rotary connecting element includes an upper bearing and a lower bearing, the outer periphery of the fixed base is provided with an upper step and a lower step, the upper bearing is disposed on the upper step and connected to the outer shell body, and the lower bearing is disposed on the lower step and connected to the outer shell body.

[0012] A further improvement to the above scheme is that the transmission connection cavity is provided with an upper connecting step and a lower connecting step, the upper connecting step being used to connect the outer periphery of the upper bearing, and the lower connecting step being used to connect the outer periphery of the lower bearing.

[0013] A further improvement to the above solution is that an assembly sleeve is provided in the mounting hole, and the assembly sleeve is fixed in the mounting hole by interference fit.

[0014] A further improvement to the above scheme is that the fixed base is provided with a transmission mounting cavity, and the transmission assembly is disposed in the transmission mounting cavity.

[0015] A further improvement to the above solution is that the transmission component is a reduction module, the drive motor is provided with an output shaft, and the output shaft is drivenly connected to the reduction module; the transmission connection cavity is provided with a gear ring, and the gear ring is drivenly engaged with the reduction module.

[0016] The beneficial effects of this utility model are: Compared to existing hub motor housings, this invention effectively reduces the overall weight of the motor by incorporating a thickened section with multiple circumferentially distributed weight-reduction grooves on the outer side of the housing body outside the drive cavity, while maintaining the overall structural strength and rigidity of the housing. The arrangement of the weight-reduction grooves not only reduces rotational inertia and improves the motor's dynamic response performance but also provides more space for heat dissipation, helping to reduce operating temperature rise. The reinforcing ribs between adjacent weight-reduction grooves cleverly divide the thickened section into multiple load-bearing units, significantly enhancing the housing's local deformation resistance and structural stability, effectively suppressing vibrations and noise that may occur during high-speed rotation. The housing cavity is clearly divided into a drive cavity and a transmission connection cavity, achieving spatial separation and functional integration of the motor drive unit and the transmission connection unit, resulting in a compact and rational structural layout. The drive motor is built into the drive cavity, and the transmission components are connected to the fixed base through a rotating connecting element in the transmission connection cavity, providing a clear transmission path and high torque transmission efficiency. The design reduces the number of parts, simplifies assembly processes, and improves product reliability and maintenance convenience. The mounting holes on the reinforcing ribs provide convenient and reliable connection points for the installation of external accessories, enhancing the motor's functional expandability and overall adaptability to meet the assembly needs of different application scenarios. This utility model optimizes the shell design and internal space layout, successfully achieving a balance between lightweight, high strength, low vibration, and high integration. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the hub motor based on the ribless shell of this utility model; Figure 2 for Figure 1 A three-dimensional schematic diagram of a hub motor based on a ribless shell from another perspective; Figure 3 for Figure 1 Front view of a hub motor based on a ribless housing; Figure 4 for Figure 3 Sectional view of AA.

[0018] Explanation of reference numerals in the attached drawings: 1. Outer shell body; 11. Drive cavity; 12. Transmission connection cavity; 121. Upper connecting step; 122. Lower connecting step; 123. Gear ring; 13. Rotary connecting element; 14. Thickened part; 141. Weight reduction groove; 142. Reinforcing rib; 143. Mounting hole; 144. Assembly sleeve; 15. Sealing flange; 151. Inner chamfer; 152. Outer chamfer; 153. Snap ring groove; 154. Fixing snap ring; 16. Seal; 161. Sealing outer lip; 162. Sealing inner lip; 2. Drive motor; 21. Output shaft; 3. Fixed base; 31. Upper step; 32. Lower step; 33. Transmission mounting cavity; 4. Transmission assembly. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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 1-4As shown, in one embodiment of this utility model, a hub motor based on a ribless shell is disclosed, including a shell body 1 and a drive motor 2, a fixed base 3, and a transmission assembly 4 disposed within the shell body 1. The outer periphery of the shell body 1 is annular. The transmission assembly 4 is disposed on the fixed base 3. The drive motor 2 is disposed on the fixed base 3 and is used to drive the transmission assembly 4 to drive the shell body 1 to rotate. The shell body 1 is provided with a mounting cavity, which includes a drive cavity 11 and a transmission connection cavity 12. The drive motor 2 is disposed within the drive cavity 11. The transmission connection cavity 12 is provided with a rotating connecting element 13 and is connected to the fixed base 3 through the rotating connecting element 13. The shell body 1 is provided with a thickened portion 14 on the outside of the drive cavity 11. The thickened portion 14 is provided with multiple weight-reducing grooves 141, which are evenly distributed circumferentially around the drive cavity 11. A reinforcing rib 142 is provided between two adjacent weight-reducing grooves 141, and the reinforcing rib 142 is provided with mounting holes 143. This embodiment effectively reduces the overall weight of the motor by setting a thickened portion 14 with multiple circumferentially distributed weight-reducing grooves 141 on the outer side of the outer shell 1 outside the drive cavity 11, while ensuring the overall structural strength and rigidity of the outer shell. The arrangement of the weight-reducing grooves 141 not only reduces the rotational inertia and improves the dynamic response performance of the motor, but also provides more space for heat dissipation, which helps to reduce the operating temperature rise. The reinforcing ribs 142 set between adjacent weight-reducing grooves 141 cleverly divide the thickened portion 14 into multiple load-bearing units, significantly enhancing the local deformation resistance and structural stability of the outer shell, and effectively suppressing the vibration and noise that may be generated during high-speed rotation. The mounting cavity is clearly divided into the drive cavity 11 and the transmission connection cavity 12, realizing the spatial separation and functional integration of the motor drive unit and the transmission connection unit, and the structural layout is compact and reasonable. The drive motor 2 is built into the drive cavity 11, and the transmission component 4 is connected to the fixed base 3 through the rotating connecting element 13 in the transmission connection cavity 12, with a clear transmission path and high torque transmission efficiency. The design reduces the number of parts, simplifies the assembly process, and improves the reliability and maintenance convenience of the product. The mounting holes 143 on the reinforcing ribs 142 provide convenient and reliable connection points for the installation of external accessories, enhancing the functional expandability of the motor and the overall adaptability of the machine, and meeting the assembly requirements of different application scenarios. This embodiment optimizes the shell design and internal space layout, successfully achieving a balance between lightweight, high strength, low vibration, and high integration.

[0022] A sealing flange 15 is provided at the port of the mounting cavity of the outer casing 1. The inner wall of the sealing flange 15 is flush with the inner wall of the mounting cavity. A sealing groove is formed between the inner wall of the sealing flange 15 and the outer periphery of the fixed base 3. A sealing element 16 is provided in the sealing groove, which is used to seal the connection between the sealing flange 15 and the fixed base 3. In this embodiment, by providing a sealing flange 15 flush with the inner wall at the port of the mounting cavity of the outer casing 1, and configuring a sealing element 16 in the sealing groove formed between the flange 15 and the outer periphery of the fixed base 3, the sealing performance and operational reliability of the hub motor are improved. The sealing surface is flush with the inner wall of the mounting cavity, effectively avoiding sealing dead angles caused by steps or gaps, ensuring uniform force on the sealing element 16, and improving the stability of dynamic sealing. The sealing groove provides reliable limiting and protection for the sealing element 16, effectively preventing displacement or damage during assembly or high-speed rotation. It can reliably block external dust, mud and water and other pollutants from entering the motor, while preventing internal lubricant leakage, thus enhancing the motor's protection level and durability in harsh environments and ensuring the long-term stable operation of the drive motor 2 and transmission components 4.

[0023] The sealing flange 15 has an inner chamfer 151 and an outer chamfer 152 on both sides of its end. In this embodiment, the inner chamfer 151 provides good guidance for the seal 16 during assembly, effectively preventing the seal 16 from being bitten, rolled, or sheared during the pressing process into the sealing groove, ensuring the integrity of the seal 16, and improving assembly efficiency and first-time success rate. The outer chamfer 152 eliminates the sharp edges at the end of the sealing flange 15, which not only improves operational safety and prevents assembly personnel from being scratched, but also facilitates the alignment and introduction of the motor during vehicle installation, reducing the risk of interference with other components. The coordinated design of the two chamfers further optimizes the structural strength of the sealing flange 15, helps to disperse stress, reduces the risk of fatigue cracks caused by stress concentration, and thus improves the long-term reliability and service life of the entire sealing structure.

[0024] A retaining ring groove 153 is provided on the side of the mounting cavity near the sealing flange 15. A retaining ring 154 is installed on the retaining ring groove 153. The upper surface of the retaining ring 154 forms a right angle with the inner circumference of the sealing flange 15, and the upper surface of the retaining ring 154 is used to support the seal 16. In this embodiment, a retaining ring groove 153 is provided on the side of the mounting cavity near the sealing flange 15, and a retaining ring 154 is installed. The upper surface of the retaining ring 154 forms a right angle with the inner circumference of the sealing flange 15, providing a stable and reliable axial support plane for the seal 16. This effectively prevents the seal 16 from axial displacement or compression relaxation during long-term operation or under internal pressure, ensuring continuous tight contact of the sealing interface. This results in uniform stress on the seal 16, avoiding premature aging or wear caused by local stress concentration, and improving the stability and durability of the seal. Meanwhile, the design of the retaining ring groove 153 enables precise positioning and secure installation of the retaining ring 154. The structure is simple and easy to assemble, further enhancing the protection of the internal drive unit and transmission components 4, and ensuring the long-term sealing reliability of the hub motor under complex working conditions.

[0025] The seal 16 includes an outer sealing lip 161 and an inner sealing lip 162. The outer sealing lip 161 seals against the inner wall of the sealing flange 15, and the inner sealing lip 162 has an S-shaped cross-section and abuts against the outer periphery of the fixed base 3. In this embodiment, by employing a composite seal 16 structure with an outer sealing lip 161 and an S-shaped inner sealing lip 162, the dual technical effects of multiple sealing and dynamic compensation are achieved. The outer sealing lip 161 and the inner wall of the sealing flange 15 form a stable and reliable static sealing interface, effectively isolating external contaminants from intrusion. The elastic curved surface structure of the S-shaped inner sealing lip 162 generates multi-directional contact pressure when abutting against the outer periphery of the fixed base 3, providing not only excellent radial sealing effect but also good following and self-adaptability. When the fixed base 3 experiences slight radial runout or eccentricity due to temperature rise or load, the S-shaped lip can actively compensate for gap changes through its own elastic deformation, always maintaining a tight fit and effectively preventing lubricant leakage. It improves the dynamic sealing reliability of the hub motor under high-speed rotation and vibration conditions, extends the service life of the seal 16, and ensures the long-term cleanliness and stable operation of the motor's internal environment.

[0026] The rotating connecting element 13 includes an upper bearing 131 and a lower bearing 132. The outer periphery of the fixed base 3 is provided with an upper step 31 and a lower step 32. The upper bearing 131 is disposed on the upper step 31 and connected to the outer casing 1, and the lower bearing 132 is disposed on the lower step 32 and connected to the outer casing 1. Specifically, the transmission connecting cavity 12 is provided with an upper connecting step 121 and a lower connecting step 122. The upper connecting step 121 is used to connect to the outer periphery of the upper bearing 131, and the lower connecting step 122 is used to connect to the outer periphery of the lower bearing 132. In this embodiment, by setting an upper connecting step 121 and a lower connecting step 122 in the transmission connecting cavity 12 of the outer shell body 1, and correspondingly setting an upper step 31 and a lower step 32 on the outer periphery of the fixed base 3, a split double bearing support structure is formed, which realizes the axial precise positioning of the rotating connecting element 13 and the reasonable distribution of load. The upper and lower steps 32 respectively bear the upper bearing 131 and the lower bearing 132, which can effectively share the radial and axial loads, improve the rigidity and stability of the bearing system, and suppress the vibration and sway during motor operation. The double-step structure facilitates the assembly and positioning of the bearings, ensures the coaxiality of the bearing installation, reduces the assembly difficulty, and improves the production efficiency. It enhances the structural integrity of the transmission connecting cavity 12, which is conducive to heat dissipation and force flow transmission, and improves the running stability and service life of the hub motor under high-speed and heavy-load conditions.

[0027] An assembly sleeve 144 is provided within the mounting hole 143, and the assembly sleeve 144 is fixed within the mounting hole 143 by an interference fit. In this embodiment, by providing the assembly sleeve 144 fixed within the mounting hole 143 by an interference fit, the local strength and wear resistance of the wall of the mounting hole 143 are effectively improved. This avoids the problem of wear or stripping of the housing material caused by stress concentration during repeated disassembly and assembly. The interference fit ensures a firm and gapless connection between the sleeve and the mounting hole 143, which not only improves the reliability of the structural connection but also enhances the resistance to vibration and loosening, ensuring the stability of the fasteners of the hub motor under complex working conditions. It also facilitates the use of high-strength materials to manufacture the sleeve, optimizes material utilization, reduces overall manufacturing costs, and provides convenience for subsequent maintenance and replacement. Simply replacing the sleeve restores the performance of the mounting hole 143, greatly improving the maintainability and economy of the product.

[0028] The fixed base 3 is provided with a transmission mounting cavity 33, and the transmission assembly 4 is disposed in the transmission mounting cavity 33. Specifically, the transmission assembly 4 is a reduction module, the drive motor 2 is provided with an output shaft 21, and the output shaft 21 is drivenly connected to the reduction module; the transmission connection cavity 12 is provided with a gear ring 123, and the gear ring 123 is drivenly meshed with the reduction module. In this embodiment, by setting the transmission assembly 4 as a reduction module and drivingly connecting it to the output shaft 21 of the drive motor 2, while simultaneously enabling the gear ring 123 in the transmission connection cavity 12 to drively mesh with the reduction module, the integration and efficiency of the power transmission path are achieved. The reduction module converts the high-speed, low-torque output of the motor into a low-speed, high-torque output suitable for wheel drive, improving the output efficiency and torque performance of the hub motor. The meshing transmission between the gear ring 123 and the reduction module ensures the smoothness and reliability of power transmission and reduces vibration and noise.

[0029] 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 based on a ribless housing, characterized in that: The device includes a housing body, a drive motor, a fixed base, and a transmission assembly disposed within the housing body. The outer periphery of the housing body is annular. The transmission assembly is disposed on the fixed base, and the drive motor is disposed on the fixed base and serves to drive the transmission assembly to rotate the housing body. The housing body has a mounting cavity, which includes a drive cavity and a transmission connection cavity. The drive motor is disposed within the drive cavity, and the transmission connection cavity has a rotary connecting element and is connected to the fixed base through the rotary connecting element. The housing body has a thickened portion located outside the drive cavity. The thickened portion has multiple weight-reducing grooves, which are evenly distributed circumferentially around the drive cavity as the axis. A reinforcing rib is disposed between two adjacent weight-reducing grooves, and the reinforcing rib has mounting holes.

2. The hub motor based on a ribless housing according to claim 1, characterized in that: The outer shell body is provided with a sealing flange at the port of the mounting cavity. The inner wall of the sealing flange is flush with the inner wall of the mounting cavity. A sealing groove is formed between the inner wall of the sealing flange and the outer periphery of the fixing base. A sealing element is provided in the sealing groove. The sealing element is used to seal the sealing flange and the fixing base.

3. The hub motor based on a ribless housing according to claim 2, characterized in that: The sealing flange has an inner chamfer and an outer chamfer on both sides of its end.

4. The hub motor based on a ribless housing according to claim 2, characterized in that: A retaining ring groove is provided on the side of the mounting cavity near the sealing flange. A retaining ring is installed on the retaining ring groove. The upper surface of the retaining ring forms a right angle with the inner circumference of the sealing flange. The upper surface of the retaining ring is used to support the sealing element.

5. The hub motor based on a ribless housing according to claim 2, characterized in that: The sealing element includes an outer sealing lip and an inner sealing lip. The outer sealing lip is used to seal against the inner wall of the sealing flange, and the inner sealing lip has an S-shaped cross section and is used to abut against the outer periphery of the fixed base.

6. The hub motor based on a ribless housing according to claim 1, characterized in that: The rotating connecting element includes an upper bearing and a lower bearing. The outer periphery of the fixed base is provided with an upper step and a lower step. The upper bearing is located on the upper step and connected to the outer shell body, and the lower bearing is located on the lower step and connected to the outer shell body.

7. The hub motor based on a ribless housing according to claim 6, characterized in that: The transmission connection cavity is provided with an upper connecting step and a lower connecting step. The upper connecting step is used to connect to the outer periphery of the upper bearing, and the lower connecting step is used to connect to the outer periphery of the lower bearing.

8. The hub motor based on a ribless housing according to claim 1, characterized in that: An assembly sleeve is provided in the mounting hole, and the assembly sleeve is fixed in the mounting hole by interference fit.

9. The hub motor based on a ribless housing according to claim 1, characterized in that: The fixed base is provided with a transmission mounting cavity, and the transmission assembly is located in the transmission mounting cavity.

10. The hub motor based on a ribless housing according to claim 9, characterized in that: The transmission component is a reduction module, the drive motor is provided with an output shaft, and the output shaft is drivenly connected to the reduction module; the transmission connection cavity is provided with a gear ring, and the gear ring is drivenly engaged with the reduction module.

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