Wheel hub motor capable of improving smoothness
By using a full-contact boss and a specific drainage groove design, combined with the fact that the number of poles of the stator assembly are mutually prime, the problem of smoothness and drainage of the hub motor when wading is solved, achieving high smoothness and high drainage under different working conditions, and reducing costs.
Patent Information
- Application Number
- CN202520494770.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-03-20
AI Technical Summary
Existing hub motors cause a decrease in tire roundness due to drainage channels when wading, affecting smoothness. Furthermore, increasing the number of drainage channels reduces grip and sewage discharge. Current improvement methods are costly and have limited effectiveness.
The design employs a full-contact boss, a first-contact boss, and a second-contact boss, combined with a specific number of bosses and drainage grooves, to ensure drainage and sewage discharge. At the same time, by designing that the number of poles of the bosses and stator components are prime numbers, vibration superposition is avoided, thereby improving the roundness and friction of the tire.
Improve the smoothness of hub motors under different operating conditions, reduce costs, enhance tire drainage and sewage discharge performance, reduce vibration and bumps, and adapt to various operating conditions.
Smart Images
Figure CN223750574U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to wheel hub motor technical field especially is related to a wheel hub motor that improves smoothness. BACKGROUND
[0002] Wheel hub motor usually refers to the driving system that integrates motor in the wheel hub, so that the traditional transmission mechanism is saved, and the wheel is directly driven. Wheel hub motor is often used in intelligent household appliances such as sweeping robot, in order to improve the adhesion of wheel hub motor when wading, it is often necessary to set up drainage groove on the tire tread, however, the existence of drainage groove will destroy the roundness of the tire to a certain extent, so when the tire rotates, periodic vibration will be caused, and the smoothness is reduced. In the prior art, the number of drainage grooves is usually increased to improve the roundness of the tire, but this leads to the decrease of the cross section of the drainage groove, and the drainage capacity is reduced, so that the adhesion is weakened, and the drainage groove not only has the effect of drainage, but also plays a role in removing sundries and dust, when the cross section of the drainage groove is small, the pollution resistance will also be reduced. In addition, holes are opened in the tire or a soft tire is used to improve the elasticity of the tire to increase the cushioning to reduce vibration and improve smoothness, but the elasticity and wear limit the improvement of smoothness, and the requirement for the material of the tire is high, so it is necessary to improve. SUMMARY
[0003] In view of the defects in the prior art, the utility model aims at providing a wheel hub motor that improves smoothness, reduces cost, improves smoothness, and has high smoothness under different working conditions.
[0004] In order to achieve the above purpose, the utility model adopts the technical scheme of: a wheel hub motor that improves smoothness, comprising a motor body, a tire, a rotor assembly and a stator assembly, the rotor assembly and the stator assembly are arranged in the motor body respectively, the tire is sleeved outside the motor body, the outer periphery of the tire is provided with a spacing ring, a plurality of first ground contact bosses, a plurality of second ground contact bosses and a plurality of full ground contact bosses, the spacing ring is arranged at the middle part of the outer periphery of the tire, each first ground contact boss and each second ground contact boss are arranged at equal intervals along the circumferential direction, each first ground contact boss is located at the first side of the spacing ring, each second ground contact boss is located at the second side of the spacing ring, a first drainage groove is arranged between the two adjacent first ground contact bosses, a second drainage groove is arranged between the two adjacent second ground contact bosses, each full ground contact boss is arranged between each first ground contact boss and each second ground contact boss, the full ground contact boss penetrates the tire along the axial direction, the number of the first drainage groove and the second drainage groove is the same, and the number of the first drainage groove and the second drainage groove is a prime number with the number of poles of the stator assembly respectively.
[0005] In the further technical scheme, the first drainage groove and the second drainage groove are arranged with 17 respectively, and the number of poles of the stator assembly is 24 poles.
[0006] Further technical solutions, the number of the first drain groove and the second drain groove is a prime number with the pole number of the rotor assembly.
[0007] Further technical solutions, the pole number of the rotor assembly is 28 poles.
[0008] Further technical solutions, each first ground contact boss and each second ground contact boss is provided with a third drain groove in the shape of "V" between the adjacent full ground contact boss.
[0009] Further technical solutions, the maximum width L of the third drain groove is 0.005-0.1mm.
[0010] Further technical solutions, the first drain groove and the second drain groove are provided with a diffusion part and a flow part from inside to outside, the outer end width of the diffusion part is greater than the width of the inner end of the diffusion part, and the inner end of the diffusion part communicates with the flow part to form a first drain groove and a second drain groove with a horn-shaped cross section.
[0011] Further technical solutions, the outer side surface of the full ground contact boss is provided with a center drain groove and a plurality of fourth drain grooves, the center drain groove is arranged at the middle of the full ground contact boss and above the spacer ring, each fourth drain groove is arranged on both sides of the center drain groove along the axial direction, and the width of the center drain groove is greater than the width of the fourth drain groove.
[0012] Further technical solutions, the outer side surface of the first ground contact boss and the second ground contact boss is provided with a plurality of fifth drain grooves, each fifth drain groove is arranged along the axial direction, and each fifth drain groove is aligned with each fourth drain groove.
[0013] Further technical solutions, the inside of the full ground contact boss is provided with two first buffer cavities with openings, the openings of the two first buffer cavities are arranged on the outer side surface of the full ground contact boss, and the two first buffer cavities are opposite and separated,
[0014] The inside of the first ground contact boss and the second ground contact boss is respectively provided with a second buffer cavity with an opening, the opening of each second buffer cavity is arranged on the outer side surface of the first ground contact boss and the second ground contact boss, and the structure and size of the first buffer cavity and the second buffer cavity are the same.
[0015] Compared with the prior art, the utility model has the advantages that: the full ground contact boss, the first ground contact boss and the second ground contact boss are arranged to improve the density of the protrusions, so that the roundness of the tire is improved, and the bump and vibration of the tire when fully contacting the ground are reduced, and the smoothness is improved; the first drainage groove and the second drainage groove are arranged to improve the drainage and pollution resistance of the tire, and the friction of the tire is improved, and the number of the first drainage groove and the second drainage groove is a prime number with the number of poles of the stator assembly, so that the periodic vibration frequencies of the two are not easy to be synchronized and superimposed in the rotating process, so that the vibration energy is dispersed, the resonance peak is avoided, and the smoothness is improved, so that the tire can avoid the vibration and bump caused by the first drainage groove and the second drainage groove when any side of the tire contacts the ground, the smoothness is improved, and the in-wheel motor has high smoothness under different operating conditions. BRIEF DESCRIPTION OF DRAWINGS
[0016] The utility model is further described below in combination with the drawings and examples.
[0017] Figure 1 It is the first side perspective view of the utility model;
[0018] Figure 2 It is the first side of the utility model Figure 1 A part enlarged view thereof;
[0019] Figure 3 It is the first side of the utility model
[0020] Figure 4 It is the first side of the utility model Figure 3 B part enlarged view thereof;
[0021] Figure 5 It is the second side perspective view of the utility model;
[0022] Figure 6 It is the state diagram of the tire one side part contacting the ground of the utility model.
[0023] In the drawing:
[0024] 1 tire, 11 interval ring, 12a first ground contact boss, 12b second ground contact boss, 121 fifth drainage groove, 122 second buffer cavity, 13a first drainage groove, 13b second drainage groove, 131 diffusion part, 132 flow part, 14 full ground contact boss, 141 center drainage groove, 142 fourth drainage groove, 143 first buffer cavity, 15 third drainage groove;
[0025] 2 motor body, 21 rotor assembly, 22 stator assembly. DETAILED DESCRIPTION
[0026] The following is only the preferred embodiment of the utility model, and does not limit the protection scope of the utility model.
[0027] A hub motor for improved ride smoothness, such as Figures 1 to 6 As shown, the device includes a motor body 2, a tire 1, a rotor assembly 21, and a stator assembly 22. The rotor assembly 21 and stator assembly 22 are respectively disposed inside the motor body 2. The tire 1 is fitted onto the outside of the motor body 2. A spacer ring 11 is provided on the outer periphery of the tire 1. Multiple first contact bosses 12a, multiple second contact bosses 12b, and multiple full contact bosses 14 are also provided. The spacer ring 11 is located at the center of the outer peripheral surface of the tire 1. Each first contact boss 12a and each second contact boss 12b is equally spaced along the circumferential direction. Each first contact boss 12a is located on the first side of the spacer ring 11. Each second ground contact boss 12b is located on the second side of the spacer ring 11. A first drainage groove 13a is provided between two adjacent first ground contact bosses 12a, and a second drainage groove 13b is provided between two adjacent second ground contact bosses 12b. Each full ground contact boss 14 is respectively provided between each first ground contact boss 12a and each second ground contact boss 12b. The full ground contact boss 14 penetrates the tire 1 in the axial direction. The number of first drainage grooves 13a and second drainage grooves 13b is the same. The number of first drainage grooves 13a and second drainage grooves 13b is a prime number relative to the number of poles of the stator assembly 22.
[0028] Traditional hub motors improve drainage and sewage discharge by increasing the size of the drainage grooves on the tire. However, as the size of the drainage grooves increases, the roundness of the tire 1 decreases. Furthermore, due to the working principle of hub motors, when the rotor assembly 21 rotates relative to the stator assembly 22, a large amount of periodic vibration superposition occurs between the drainage grooves and the stator assembly 22. This is especially true for low-speed, high-torque hub motors, where the number of synchronous superpositions is even greater, leading to vibration and bumps, resulting in poor ride smoothness. While reducing the size of the drainage grooves can improve the roundness of the tire 1, it worsens drainage and sewage discharge, reducing tire friction. This invention addresses this issue by using a full-contact boss 14, a first contact boss 12a, and a second contact boss... The ground contact boss 12b increases the density of the protrusions, thereby improving the roundness of the tire 1 and reducing bumps and vibrations when the tire 1 is in full contact with the ground, thus improving smoothness. The first drainage groove 13a and the second drainage groove 13b increase the tire 1's drainage and waste removal capabilities, improving its friction. Simultaneously, the number of the first drainage groove 13a and the second drainage groove 13b are respectively prime numbers relative to the number of poles of the stator assembly 22, ensuring that their phase difference is evenly distributed per revolution. This reduces the coherence of periodic vibrations, making it less likely for their periodic vibration frequencies to overlap synchronously during rotation, thus dispersing vibration energy and avoiding resonance peaks. This ensures that regardless of which side of the tire 1 contacts the ground, as... Figure 6 As shown, both can avoid the vibration and bumps caused by the first drainage trough 13a and the second drainage trough 13b, improve the smoothness, and enable the hub motor to have high smoothness under different operating conditions.
[0029] Specifically, the first drain grooves 13a and the second drain grooves 13b are respectively provided with 17, and the pole number of the stator assembly 22 is 24 poles. The first drain grooves 13a and the second drain grooves 13b add up to a total of 34 drain grooves for axial drainage and sewage, improving the drainage and sewage performance of the wheel motor. At the same time, the pole number of the stator assembly 22 is 24 poles, which meets the condition that the number of the first drain grooves 13a and the second drain grooves 13b is relatively prime with the pole number of the stator assembly 22, and the pole number of the stator assembly 22 is increased to reduce the speed of the wheel motor and improve the torque of the wheel motor, so as to better adapt to household appliances such as floor cleaning robots.
[0030] Specifically, the number of the first drain grooves 13a and the second drain grooves 13b is relatively prime with the pole number of the rotor assembly 21. The number of the first drain grooves 13a and the second drain grooves 13b is relatively prime with the pole number of the stator assembly 22 and the pole number of the rotor assembly 21 at the same time, thereby further reducing the coupling superposition of mechanical and electromagnetic vibrations to further reduce vibration and jolt and improve smoothness.
[0031] Specifically, the pole number of the rotor assembly 21 is 28 poles.
[0032] Specifically, each first ground contact boss 12a and each second ground contact boss 12b is provided with a third drain groove 15 in the shape of a "V" between the adjacent full ground contact boss 14.
[0033] When the tire 1 is completely in contact with the ground, drainage is performed through the third drain groove 15, and the ground contact boss 14, the first ground contact boss 12a and the second ground contact boss 12b are sequentially in contact with the ground, thereby improving the roundness of the tire when it is in contact with the ground to reduce vibration and jolt and improve smoothness.
[0034] Specifically, as shown in Figure 4 The maximum width L of the third drain groove 15 is 0.005-0.1 mm. Preferably, the maximum width L of the third drain groove 15 is 0.01-0.03 mm to reduce the size of the third drain groove 15 and improve the roundness of the tire. To prevent the drainage and sewage performance from being reduced, the first drain groove 13a and the second drain groove 13b are used to improve the drainage and sewage performance.
[0035] Specifically, the first drain groove 13a and the second drain groove 13b are provided with a diffusion part 131 and a flow part 132 from inside to outside, the outer end part width of the diffusion part 131 is greater than the width of the inner end part of the diffusion part 131, and the inner end part of the diffusion part 131 is in communication with the flow part 132 to form the first drain groove 13a and the second drain groove 13b with a horn-shaped cross section. The first drain groove 13a and the second drain groove 13b guide water to be discharged in the axial direction through the flow part 132 and in the radial direction through the diffusion part 131, so as to improve the water drainage efficiency.
[0036] Specifically, the outer side surface of the full-contact protrusion 14 is provided with a central drain groove 141 and a plurality of fourth drain grooves 142, the central drain groove 141 is arranged at the middle of the full-contact protrusion 14 and above the spacing ring 11, each fourth drain groove 142 is arranged on both sides of the central drain groove 141 in the axial direction, and the width of the central drain groove 141 is greater than that of the fourth drain groove 142. The central drain groove 141 and each fourth drain groove 142 are used to drain water in the radial direction when the full-contact protrusion 14 touches the ground, and the central drain groove 141 has a wider width to improve the water drainage performance.
[0037] Specifically, the outer side surface of the first contact protrusion 12a and the second contact protrusion 12b is provided with a plurality of fifth drain grooves 121, each fifth drain groove 121 is arranged in the axial direction, and each fifth drain groove 121 is aligned with each fourth drain groove 142. Each fifth drain groove 121 is used to drain water in the radial direction when the first contact protrusion 12a and the second contact protrusion 12b touch the ground, and is aligned with the fourth drain groove 142 to avoid turbulence during water drainage, thereby improving the water drainage efficiency.
[0038] Specifically, the inside of the full-contact protrusion 14 is provided with two first buffer cavities 143 with openings, the openings of the two first buffer cavities 143 are arranged on the outer side surface of the full-contact protrusion 14, the two first buffer cavities 143 are opposite and separated, the inside of the first contact protrusion 12a and the second contact protrusion 12b is provided with a second buffer cavity 122 with an opening, the opening of each second buffer cavity 122 is arranged on the outer side surface of the first contact protrusion 12a and the second contact protrusion 12b, and the first buffer cavity 143 and the second buffer cavity 122 have the same structure and size. The first buffer cavity 143 and the second buffer cavity 122 increase the elasticity of the tire 1 to improve the shock absorption performance, the two first buffer cavities 143 are opposite and separated, so that the spacing ring 11 has a solid structure, thereby improving the supportability of the tire 1, and facilitating the drainage of water or sundries in the first buffer cavity 143 and the second buffer cavity 122 to both sides when the tire 1 touches and is pressed.
[0039] The above merely describes preferred embodiments of the present application, and for those skilled in the art, according to the idea of the present application, changes can be made in the specific implementation manner and application range, and the content of the specification should not be understood as a limitation of the present application.
Claims
1. A ride comfort improving in-wheel motor, comprising a motor body (2), a tire (1), a rotor assembly (21) and a stator assembly (22), the rotor assembly (21) and the stator assembly (22) are respectively arranged in the motor body (2), the tire (1) is sleeved outside the motor body (2), characterized in that: A spacer ring (11) is provided on the outer periphery of the tire (1), along with multiple first contact protrusions (12a), multiple second contact protrusions (12b), and multiple full contact protrusions (14). The spacer ring (11) is located at the center of the outer periphery of the tire (1). Each first contact protrusion (12a) and each second contact protrusion (12b) is equally spaced along the circumferential direction. Each first contact protrusion (12a) is located on the first side of the spacer ring (11), and each second contact protrusion (12b) is located on the second side of the spacer ring (11). Two adjacent first contact protrusions (12a, 12b, and 14 are connected at equal intervals. A first drainage groove (13a) is provided between 2a), and a second drainage groove (13b) is provided between two adjacent second ground contact bosses (12b). Each full ground contact boss (14) is provided between each first ground contact boss (12a) and each second ground contact boss (12b). The full ground contact boss (14) passes through the tire (1) in the axial direction. The number of first drainage grooves (13a) and second drainage grooves (13b) is the same. The number of first drainage grooves (13a) and second drainage grooves (13b) is respectively prime to the number of poles of the stator assembly (22).
2. The wheel hub motor for improving ride comfort according to claim 1, characterized in that: The first drainage trough (13a) and the second drainage trough (13b) are each provided with 17, and the stator assembly (22) has 24 poles.
3. The smoothness-improving in-wheel motor according to claim 2, characterized by: The number of the first drainage groove (13a) and the second drainage groove (13b) are respectively prime numbers to the number of poles of the rotor assembly (21).
4. The wheel hub motor for improving ride comfort according to claim 3, characterized in that: The rotor assembly (21) has 28 poles.
5. The smoothness-improved in-wheel motor according to any one of claims 1 to 4, characterized by: Each of the first ground contact protrusions (12a) and each of the second ground contact protrusions (12b) is provided with a "V"-shaped third drainage channel (15) between each of the adjacent full ground contact protrusions (14).
6. A hub motor for improving ride smoothness according to claim 5, characterized in that: The maximum width L of the third drainage channel (15) is 0.005 to 0.1 mm.
7. A hub motor for improving ride smoothness according to claim 5, characterized in that: The first drainage trough (13a) and the second drainage trough (13b) are provided with a diffuser (131) and a flow trough (132) from the inside to the outside. The width of the outer end of the diffuser (131) is greater than the width of the inner end of the diffuser. The inner end of the diffuser (131) is connected to the flow trough (132) to form a first drainage trough (13a) and a second drainage trough (13b) with a trumpet-shaped cross section.
8. A hub motor for improving ride smoothness according to claim 5, characterized in that: The outer side of the full-contact boss (14) is provided with a central drainage groove (141) and a plurality of fourth drainage grooves (142). The central drainage groove (141) is located in the middle of the full-contact boss (14) and above the spacer ring (11). Each fourth drainage groove (142) is arranged at intervals on both sides of the central drainage groove (141) along the axial direction. The width of the central drainage groove (141) is greater than the width of the fourth drainage groove (142).
9. A hub motor for improving ride smoothness according to claim 8, characterized in that: The outer surfaces of the first ground contact protrusion (12a) and the second ground contact protrusion (12b) are provided with a plurality of fifth drainage grooves (121), each fifth drainage groove (121) is spaced apart along the axial direction, and each fifth drainage groove (121) is aligned with each of the fourth drainage grooves (142).
10. A hub motor for improving ride smoothness according to claim 5, characterized in that: The full-contact boss (14) has two first buffer cavities (143) with openings inside. The openings of the two first buffer cavities (143) are both located on the outer side of the full-contact boss (14), and the two first buffer cavities (143) are separated from each other. The first ground contact protrusion (12a) and the second ground contact protrusion (12b) are respectively provided with a second buffer cavity (122) with an opening. The opening of each second buffer cavity (122) is provided on the outer side of the first ground contact protrusion (12a) and the second ground contact protrusion (12b). The first buffer cavity (143) and the second buffer cavity (122) have the same structure and size.