Hub motor capable of improving waterproofness

By improving the waterproof sealing components of the hub motor and adopting the design of annular elastic groove and elastic sealing frame, the problem of reduced waterproof performance caused by deformation of rubber sealing ring has been solved, achieving higher sealing and waterproof performance, reducing friction, and improving reliability and stability.

CN223957374UActive Publication Date: 2026-02-27DONGGUAN WEICHUANG POWER TECH CO LTD
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Patent Information

Application Number
CN202520494814.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-20
Publication Date
2026-02-27
Estimated Expiration
2035-03-20

AI Technical Summary

Technical Problem

The rubber seals of traditional hub motors are prone to deformation when foreign objects get caught in them, which leads to a decrease in waterproof performance.

Method used

A waterproof sealing assembly including a rubber sealing ring and an elastic sealing frame is adopted. The rigidity and elasticity of the rubber sealing ring are improved by the annular elastic groove, the clamping angle is increased, the elastic potential energy of the support and elastic parts is used to increase the pressure resistance, and the friction is reduced by the inclined elastic pressure resistance part. The combination of the snap ring between the rotor end cover and the rotor housing and the sealant fills the gap to enhance the sealing performance.

Benefits of technology

It improves the waterproof performance and sealing of the hub motor, reduces friction, increases reliability and stability, prevents water and foreign objects from entering, and extends the service life of the rubber seals.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN223957374U_ABST
    Figure CN223957374U_ABST
Patent Text Reader

Abstract

A waterproof sealing assembly is arranged between a rotor end cover and a stator support, the waterproof sealing assembly comprises a rubber sealing ring and an elastic sealing frame, the rubber sealing ring is provided with an annular elastic groove with an outward opening, the rubber sealing ring is internally provided with a support installation cavity, and the support installation cavity is internally provided with an annular elastic groove with an outward opening. The elastic sealing frame is arranged in the support installation cavity and comprises a supporting part and an elastic part, the elastic part is formed on the lower portion of the supporting part, the supporting part is located on the first side of the annular elastic groove, and the elastic part extends to the second side of the elastic groove or below the elastic groove. The rigidity of the rubber sealing ring is increased through the elastic sealing frame, the water leakage phenomenon caused by deformation of the rubber sealing ring is prevented, and the waterproof performance is improved; the elasticity of the rubber sealing ring is improved through the annular elastic groove, and the sealing performance of the rubber sealing ring is improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to wheel hub motor technical field especially is related to a wheel hub motor that improves waterproofness. BACKGROUND

[0002] Wheel hub motor is a kind of outer rotor motor, in the field of household, wheel hub motor is as the power device of miniaturization product such as floor cleaning robot, with small volume, the advantage of big torque, but inevitably involves water in the operation process, thus wheel hub motor needs to have higher waterproof performance. The traditional wheel hub motor is sealed between rotor and mover by rubber sealing ring, and the rubber sealing ring is fixed by the clamping groove between rotor and stator, when foreign matter is involved, the rubber sealing ring is prone to deformation, thereby reducing waterproof performance, thus 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 waterproofness, improves the sealing property of wheel hub motor and improves waterproof performance.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme of: a wheel hub motor that improves waterproofness, including rotor shell, rotor end cover, rotor assembly, stator support and stator assembly, rotor end cover covers in rotor shell, rotor assembly is fixedly installed in rotor shell, stator support is rotatably installed in rotor shell, stator assembly is fixedly installed in stator support, waterproof sealing assembly is arranged between rotor end cover and stator support, waterproof sealing assembly includes rubber sealing ring and elastic sealing frame, rubber sealing ring is provided with annular elastic groove with opening outward, the inside of rubber sealing is provided with support installation cavity, elastic sealing frame is arranged in support installation cavity, elastic sealing frame includes support part and elastic part, elastic part is formed in the lower part of support part, support part is located at the first side of annular elastic groove, and elastic part extends to the second side of elastic groove or below the elastic groove.

[0005] In further technical solutions, the rubber sealing ring includes a fixed portion, a connecting portion, and an elastic pressing portion. The connecting portion is formed on the lower part of the fixed portion and the elastic pressing portion, respectively, forming a rubber sealing ring with a "U" shaped cross section. The support portion is located in the fixed portion, and the elastic portion extends into the connecting portion or the elastic pressing portion.

[0006] In further technical solutions, a rotating installation hole is formed in the middle of the rotor end cover. A sealing boss is arranged on the side of the stator support facing the rotor end cover. The sealing boss is inserted into the rotating installation hole. The waterproof sealing assembly is arranged between the rotating installation hole and the sealing boss. The outer edge of the rotating installation hole extends inwardly to form a fixed step. The upper part of the fixed portion abuts against the fixed step. The outer side of the fixed portion abuts against the inner wall of the rotating installation hole. The outer side of the elastic pressing portion abuts against the outer side of the sealing boss.

[0007] Further technical solutions, the inner side of the fixed part protrudes inwardly from the inner side of the sealing boss, the lower part of the connecting part and the stator support are provided with an operating gap, and the elastic sealing frame is made of metal or plastic.

[0008] Further technical solutions, the upper part of the elastic pressing part is inclinedly arranged towards the sealing boss, and the included angle between the elastic pressing part and the sealing boss is 1-89°.

[0009] Further technical solutions, the lower part of the outer side of the elastic pressing part is provided with an inwardly protruding lower sealing convex ring, and the upper edge of the elastic pressing part and the lower sealing convex ring abut against the sealing boss respectively.

[0010] Further technical solutions, the lower part of the connecting part is provided with at least one opening downward elastic force strengthening groove, and the elastic force strengthening groove is located below the annular elastic groove and close to one side of the fixed part.

[0011] Further technical solutions, the outer side of the fixed part is provided with a plurality of sealing pressure rings from top to bottom, each sealing pressure ring protrudes from the outer side of the fixed part and abuts against the inner wall of the rotating mounting hole.

[0012] Further technical solutions, the side of the fixed part towards the annular elastic groove is provided with a plurality of assembly clamping grooves in the circumferential direction.

[0013] Further technical solutions, the lower part of the rotor end cover is arranged on the upper part of the rotor shell, the upper part of the inner wall of the rotor shell is provided with an annular clamping groove, the lower part of the rotor end cover is provided with an inwardly protruding clamping ring, one side of the clamping ring towards the clamping groove is provided with a clamping part, the clamping part is clamped in the clamping groove, the upper edge of the inner wall of the rotor shell is provided with a guide inclined surface, the guide inclined surface is outwardly inclinedly arranged from bottom to top, a sealing cavity is formed between the guide inclined surface and the clamping ring, and the sealing cavity is filled with sealing glue.

[0014] Compared with the prior art, the utility model has the advantages that: the rigidity of the rubber sealing ring is increased by the elastic sealing frame, the water leakage caused by the deformation of the rubber sealing ring is prevented, and the waterproof performance is improved; the elasticity of the rubber sealing ring is improved by the annular elastic groove, the sealing property of the rubber sealing ring is improved, the annular elastic groove is arranged outward, the clamping angle between the rubber sealing ring and the rotor end cover and the stator support is improved, the inclined angle between the rubber sealing ring and the rotor end cover and the stator support is avoided, water is prevented from entering along the inclined angle, and the waterproof performance is further improved; the pressing force of the rubber sealing ring to the rotor end cover and the stator support is improved by the elastic potential energy between the supporting part and the elastic part, and the sealing property of the rubber sealing ring is further improved; the elastic pressing part is arranged obliquely to reduce the contact area between the elastic pressing part and the stator support, and the running friction is reduced; the rotor end cover is buckled and connected with the rotor shell by the clamping ring and forms a sealed cavity, the gap between the rotor end cover and the rotor shell is filled by filling the sealing glue in the sealed cavity, and the sealing property is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model is further explained in connection with the drawings and examples.

[0016] Figure 1 It is the structure schematic diagram of the utility model;

[0017] Figure 2 It is the exploded view of the utility model;

[0018] Figure 3 It is the sectional view of the utility model;

[0019] Figure 4 It is the Figure 3 A part enlarged view of the utility model;

[0020] Figure 5 It is the Figure 3 B part enlarged view of the utility model;

[0021] Figure 6 It is the sectional view of the rubber sealing ring of the utility model.

[0022] In the drawing:

[0023] 1 rotor shell, 11 clamping groove, 12 guide inclined surface;

[0024] 2 rotor end cover, 21 rotation installation hole, 22 fixed step, 23 clamping ring, 24 buckle part;

[0025] 3 rotor assembly;

[0026] 4 stator support, 41 sealing boss;

[0027] 5 stator assembly;

[0028] 6 Waterproof sealing component, 61 Rubber sealing ring, 611 Fixing part, 612 Connecting part, 613 Elastic pressing part, 614 Annular elastic groove, 615 Lower sealing convex ring, 616 Elastic reinforcing groove, 617 Sealing pressure ring, 618 Assembly slot, 619 Bracket mounting cavity, 62 Elastic sealing frame, 621 Support part, 622 Elastic part;

[0029] 7. Sealed cavity;

[0030] 8. Operating intervals. Detailed Implementation

[0031] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0032] A hub motor with improved waterproofing, such as Figures 1 to 6 As shown, the device includes a rotor housing 1, a rotor end cover 2, a rotor assembly 3, a stator support 4, and a stator assembly 5. The rotor end cover 2 is fitted onto the rotor housing 1. The rotor assembly 3 is fixedly installed inside the rotor housing 1. The stator support 4 is rotatably installed inside the rotor housing 1. The stator assembly 5 is fixedly installed on the stator support 4. A waterproof sealing assembly 6 is provided between the rotor end cover 2 and the stator support 4. The waterproof sealing assembly 6 includes a rubber sealing ring 61 and an elastic sealing frame 62. The rubber sealing ring 61 is provided with an annular elastic groove 614 with an outward opening. A support mounting cavity 619 is provided inside the rubber sealing ring. The elastic sealing frame 62 is provided inside the support mounting cavity 619. The elastic sealing frame 62 includes a support portion 621 and an elastic portion 622. The elastic portion 622 is formed on the lower part of the support portion 621. The support portion 621 is located on the first side of the annular elastic groove 614. The elastic portion 622 extends to the second side of the elastic groove or below the elastic groove. Traditional hub motors use ordinary sealing gaskets to seal the rotor end cover 2 and stator support 4. To improve the elasticity of the gasket, it is often hollow, and the annular elastic groove 614 faces inward to prevent foreign objects from being trapped. This makes the gasket prone to deformation, leading to a decrease in waterproofing. This invention increases the rigidity of the rubber sealing ring 61 by using an elastic sealing frame 62, preventing deformation and leakage, and improving waterproofing performance. The annular elastic groove 614 further enhances the rigidity of the rubber sealing ring. The elasticity of the sealing ring 61 increases the sealing performance of the rubber sealing ring 61. The annular elastic groove 614 is set outward, which increases the clamping angle between the rubber sealing ring 61 and the rotor end cover 2 and the stator support 4, avoiding the formation of an oblique angle between the rubber sealing ring 61 and the rotor end cover 2 and the stator support 4, thus preventing water from entering along the oblique angle and further improving the waterproof performance. The elastic potential energy between the support part 621 and the elastic part 622 increases the pressure of the rubber sealing ring 61 against the rotor end cover 2 and the stator support 4, further improving the sealing performance of the rubber sealing ring 61.

[0033] Specifically, the rubber seal ring 61 comprises a fixed part 611, a connecting part 612 and an elastic pressing part 613, the two sides of the connecting part 612 are respectively formed on the fixed part 611 and the lower part of the elastic pressing part 613, forming a rubber seal ring 61 with a "U" shaped cross section, the supporting part 621 is located in the fixed part 611, and the elastic part 622 extends into the connecting part 612 or the elastic pressing part 613. The "U" shaped rubber seal ring 61 can improve the radial elastic force of the rubber seal ring 61 to improve the sealing performance and prevent falling off.

[0034] Specifically, the middle part of the rotor end cover 2 is provided with a rotating mounting hole 21, the side of the stator support 4 facing the rotor end cover 2 is provided with a sealing boss 41, the sealing boss 41 is inserted into the rotating mounting hole 21, the waterproof sealing assembly 6 is arranged between the rotating mounting hole 21 and the sealing boss 41, the outer edge of the rotating mounting hole 21 extends inwardly to form a fixed step 22, the upper part of the fixed part 611 abuts against the fixed step 22, the outer side of the fixed part 611 abuts against the inner wall of the rotating mounting hole 21, and the outer side of the elastic pressing part 613 abuts against the outer side of the sealing boss 41. The rubber seal ring 61 is limited by the fixed step 22 to prevent falling off, thereby improving reliability and stability; the fixed part 611 of the rubber seal ring 61 abuts against the rotor end cover 2 and rotates together with the rotor end cover 2, and the elastic pressing part 613 abuts against the sealing boss 41 under the elastic potential energy of the elastic part 622 to ensure that the sealing boss 41 is always sealed during rotation, thereby preventing water and foreign matters from entering.

[0035] Specifically, the inner side of the fixed part 611 protrudes inwardly from the inner side of the sealing boss 41, the lower part of the connecting part 612 and the stator support 4 are provided with a running gap 8, and the elastic sealing bracket 62 is made of metal or plastic. The running gap 8 prevents friction between the connecting part 612 and the stator support 4 during operation to prevent the rubber seal ring 61 from generating a non-sealing contact surface with the stator support 4, thereby reducing friction, improving the rotation speed and torque of the hub motor, reducing power consumption, and reducing the wear of the rubber seal ring 61.

[0036] Specifically, the upper part of the elastic pressing part 613 is inclinedly arranged towards the sealing boss 41, and the included angle between the elastic pressing part 613 and the sealing boss 41 is 1-89°. The inclinedly arranged elastic pressing part 613 reduces the contact area between the elastic pressing part 613 and the stator support 4 to further reduce the running friction, and the inclinedly arranged elastic pressing part 613 also plays a role of water guide to guide the water flowing into the annular elastic groove 614 outwards to prevent the water from accumulating in the annular elastic groove 614. Preferably, the included angle between the elastic pressing part 613 and the sealing boss 41 is 15-30°.

[0037] Specifically, the lower part of the outer side surface of the elastic pressing part 613 is provided with an inwardly protruding lower sealing convex ring 615, and the upper edge of the elastic pressing part 613 and the lower sealing convex ring 615 abut against the sealing convex platform 41 respectively. A secondary sealing surface is formed by the lower sealing convex ring 615, and even if the upper edge of the elastic pressing part 613 is damaged, the lower sealing convex ring 615 can still seal, thereby further improving the sealing performance and waterproof performance, and the reliability is high.

[0038] Specifically, the lower part of the connecting part 612 is provided with at least one opening downward elastic force strengthening groove 616, and the elastic force strengthening groove 616 is located below the annular elastic groove 614 and close to one side of the fixed part 611. The lower part wall thickness of the bracket mounting cavity 619 is reduced by the elastic force strengthening groove 616, and the upper part wall thickness of the bracket mounting cavity 619 is relatively thick towards the annular elastic groove 614, so that the elastic pressing part 613 is in an inclined state in a natural state, the pressing force of the elastic pressing part 613 on the sealing convex platform 41 is improved, and the sealing performance is improved.

[0039] Specifically, the outer side surface of the fixed part 611 is provided with a plurality of sealing press rings 617 from top to bottom, and each sealing press ring 617 protrudes from the outer side surface of the fixed part 611 and abuts against the inner wall of the rotary mounting hole 21. The pressing force and the contact area between the fixed part 611 and the rotor end cover 2 are increased by the plurality of sealing press rings 617, the friction force is improved, and the rubber sealing ring 61 is further prevented from falling off.

[0040] Specifically, the fixed part 611 is provided with a plurality of assembly clamping grooves 618 in the circumferential direction towards one side of the annular elastic groove 614. The rubber sealing ring 61 can be easily grabbed by a mechanical hand through the assembly clamping grooves 618, and the automatic production is facilitated.

[0041] Specifically, the lower part of the rotor end cover 2 is arranged on the upper part of the rotor shell 1, the inner wall of the rotor shell 1 is provided with an annular clamping groove 11 in the upper part, the lower part of the rotor end cover 2 is provided with an inwardly protruding clamping ring 23, one side of the clamping ring 23 towards the clamping groove 11 is provided with a buckle part 24, the buckle part 24 is clamped in the clamping groove 11, and the upper edge of the inner wall of the rotor shell 1 is provided with a guide inclined surface 12, which is arranged outwardly inclined from bottom to top, and a sealing cavity 7 is formed between the guide inclined surface 12 and the clamping ring 23, and the sealing cavity 7 is filled with sealing glue. The rotor end cover 2 is buckled and connected with the rotor shell 1 through the clamping ring 23 and forms the sealing cavity 7, the gap between the rotor end cover 2 and the rotor shell 1 is filled by filling the sealing glue in the sealing cavity 7, and the sealing performance is improved.

[0042] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A kind of wheel hub motor for improving waterproofness, including rotor shell (1), rotor end cover (2), rotor assembly (3), stator support (4) and stator assembly (5), rotor end cover (2) covers rotor shell (1), rotor assembly (3) is fixedly installed in rotor shell (1), stator support (4) is rotatably installed in rotor shell (1), stator assembly (5) is fixedly installed in stator support (4), it is characterized by: A waterproof sealing assembly (6) is arranged between the rotor end cover (2) and the stator support (4), and the waterproof sealing assembly (6) comprises a rubber sealing ring (61) and an elastic sealing frame (62), the rubber sealing ring (61) is provided with an annular elastic groove (614) with an opening facing outward, the inside of the rubber sealing ring is provided with a support mounting cavity (619), the elastic sealing frame (62) is arranged in the support mounting cavity (619), the elastic sealing frame (62) comprises a supporting part (621) and an elastic part (622), the elastic part (622) is formed at the lower part of the supporting part (621), the supporting part (621) is located at the first side of the annular elastic groove (614), and the elastic part (622) extends to the second side of the elastic groove or below the elastic groove.

2. The water resistance-improved in-wheel motor according to claim 1, characterized by: The rubber sealing ring (61) comprises a fixed part (611), a connecting part (612) and an elastic pressing part (613), the two sides of the connecting part (612) are respectively formed at the lower part of the fixed part (611) and the elastic pressing part, forming a rubber sealing ring (61) with a "U" shaped cross section, the supporting part (621) is located in the fixed part (611), and the elastic part (622) extends into the connecting part (612) or the elastic pressing part (613).

3. The water resistance-improved wheel hub motor according to claim 2, characterized in that: The middle part of the rotor end cover (2) is provided with a rotating mounting hole (21), one side of the stator support (4) towards the rotor end cover (2) is provided with a sealing boss (41), the sealing boss (41) is inserted into the rotating mounting hole (21), the waterproof sealing assembly (6) is arranged between the rotating mounting hole (21) and the sealing boss (41), the outer edge of the rotating mounting hole (21) extends inwardly to form a fixed step (22), the upper part of the fixed part (611) abuts against the fixed step (22), the outer side of the fixed part (611) abuts against the inner wall of the rotating mounting hole (21), and the outer side of the elastic pressing part (613) abuts against the outer side of the sealing boss (41).

4. The water resistance-improved wheel hub motor according to claim 3, characterized in that: The inner side of the fixed part (611) protrudes inwardly from the inner side of the sealing boss (41), an operating gap (8) is arranged between the lower part of the connecting part (612) and the stator support (4), and the elastic sealing frame (62) is made of metal or plastic.

5. The water resistance-improved wheel hub motor according to claim 3, characterized in that: The upper part of the elastic pressing part (613) is arranged obliquely towards the sealing boss (41), and the included angle between the elastic pressing part (613) and the sealing boss (41) is 1-89°.

6. The water resistance-improved wheel hub motor according to claim 5, characterized in that: The lower part of the outer side of the elastic pressing part (613) is provided with an inwardly protruding lower sealing convex ring (615), and the upper edge of the elastic pressing part (613) and the lower sealing convex ring (615) abut against the sealing boss (41) respectively.

7. The water resistance-improved wheel hub motor according to claim 3, characterized in that: The lower part of the connecting part (612) is provided with at least one elastic force strengthening groove (616) with an opening facing downward, and the elastic force strengthening groove (616) is located below the annular elastic groove (614) and close to one side of the fixed part (611).

8. The water resistance-improved wheel hub motor according to claim 3, characterized in that: The outer side surface of the fixed part (611) is provided with a plurality of sealing compression rings (617) at intervals from top to bottom, each sealing compression ring (617) protrudes from the outer side surface of the fixed part (611) and abuts against the inner wall of the rotating mounting hole (21).

9. The water resistance-improved wheel hub motor according to claim 3, characterized in that: The fixed part (611) is provided with a plurality of assembly clamping grooves (618) at intervals in the circumferential direction on one side thereof facing the annular elastic groove (614).

10. The water resistance-improved wheel hub motor according to any one of claims 3 to 9, characterized in that: The lower cover of the rotor end cover (2) is arranged on the upper portion of the rotor shell (1), the inner wall of the rotor shell (1) is provided with an annular clamping groove (11) on the upper portion, the lower portion of the rotor end cover (2) is provided with an inwardly protruding clamping ring (23), the side of the clamping ring (23) facing the clamping groove (11) is provided with a buckle portion (24), the buckle portion (24) is clamped in the clamping groove (11), the upper portion of the inner wall of the rotor shell (1) is provided with a guide inclined surface (12), the guide inclined surface (12) is outwardly inclined from bottom to top, a sealing cavity (7) is formed between the guide inclined surface (12) and the clamping ring (23), and the sealing cavity (7) is filled with sealing glue.