Hub motor with anti-winding function

Abstract

The utility model discloses a wheel hub motor with an anti-winding function, which comprises a rotor assembly and a stator assembly, the rotor assembly and the stator assembly are in coaxial rotation fit, the inner side of the rotor assembly is provided with a sealing cover, the outer side of the stator assembly is fixedly provided with an end cover, and a labyrinth channel is formed between the edge part of the sealing cover and the end cover and is used for preventing winding, a first baffle ring and a second baffle ring are arranged on the edge part of the sealing cover at an interval from outside to inside, and an annular groove is formed between the first baffle ring and the second baffle ring; the edge of the sealing cover is provided with a cover brim protruding inwards, a labyrinth ring is formed on the edge of the cover brim, the labyrinth ring is matched with the annular groove, the labyrinth ring is movably embedded into the annular groove and is in transition fit with the inner wall of the annular groove with the radial gap ranging from 0.1 mm to 0.3 mm, the labyrinth ring and the inner wall of the annular groove form a nonlinear channel, and the labyrinth ring comprises a two-stage right-angle steering structure. Compared with the prior art, the anti-winding capability of the end cover is improved, and the risk of invasion of external foreign matters is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and in particular to a hub motor with an anti-winding function. Background Technology

[0002] Hub motors are widely used in the drive modules of robotic vacuum cleaners. Existing hub motors include a stator end cover and a rotor inner cover. The stator end cover has an anti-tangling function, and a planar gap seal (gap width ≥ 1mm) is formed between the stator end cover's lip and the rotor inner cover. However, foreign objects can still directly enter the motor cavity along a straight path. Experimental data shows that cables with a diameter of 0.3mm or more have a greater than 65% probability of being sucked in when the motor is running.

[0003] In addition, existing technologies also employ a single-layer retaining ring design for anti-winding on the rotor components. This involves setting a protruding retaining ring on the inner edge of the rotor housing, with the retaining ring located outside the rim of the stator end cover. However, this single-layer retaining ring design cannot create a multi-stage, labyrinthine channel. When flexible foreign objects such as hair come into contact with the retaining ring, they may still wind and accumulate tangentially, eventually causing blockage in the bearing area. Therefore, improvements are necessary. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hub motor with anti-entanglement function. Through the labyrinth channel of two-stage steering, the anti-entanglement ability of the hub motor is improved and the probability of foreign objects intruding is reduced.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hub motor with anti-winding function, including a rotor assembly and a stator assembly, which are coaxially rotatably coupled. The inner side of the rotor assembly is provided with a cover, and the outer side of the stator assembly is fixedly installed with an end cover. A labyrinth channel is formed between the edge of the cover and the end cover for anti-winding. The edge of the cover is provided with a first retaining ring and a second retaining ring spaced apart from the outside to the inside, and an annular groove is formed between the first retaining ring and the second retaining ring. The edge of the cover is provided with an inwardly protruding cover rim, and the edge of the cover rim is formed with a labyrinth ring. The labyrinth ring matches the annular groove and is movably embedded in the annular groove, forming a transition fit with the inner wall of the annular groove with a radial clearance of 0.1-0.3mm. The labyrinth ring and the inner wall of the annular groove form a non-linear channel, including a two-stage right-angle steering structure.

[0006] In a further technical solution, the depth of the annular groove is 2mm-5mm and the width is 3mm-8mm.

[0007] In a further technical solution, the transition gap between the labyrinth ring and the inner wall of the annular groove is set in a gradient, with the gap near the entrances on both sides being smaller than the gap at the bottom.

[0008] In a further technical solution, the inner and outer edges of the annular groove are chamfered, and the edge caps are assembled.

[0009] In a further technical solution, the protrusion height of the first retaining ring is smaller than the protrusion height of the second retaining ring.

[0010] In a further technical solution, the inner edge of the cover is provided with a first inverted buckle ring, the bottom of the first inverted buckle ring is convex outward and forms an outward-facing snap-fit ​​part with the bottom surface of the cover; the opening of the rotor housing is provided with a second inverted buckle ring, the top of the second inverted buckle ring is convex inward and forms an inverted buckle part, the inverted buckle part is snapped into the snap-fit ​​part to realize the fast connection assembly between the cover and the rotor housing.

[0011] In a further technical solution, the stator assembly includes a stator base, and a through-hole assembly cavity is provided at the center of the stator base for assembling a rotating shaft. A bearing is fixed to the upper and lower parts of the assembly cavity, and the rotating shaft is inserted into the inner ring of the two bearings.

[0012] In a further technical solution, the upper part of the rotating shaft is provided with a retaining ring, an elastic seal ring and a washer in sequence from top to bottom. The elastic seal ring and the washer are clamped on the upper side of the bearing by the retaining ring, and the circumference of the elastic seal ring is fitted with the inner wall of the assembly cavity to prevent the intrusion of external dust.

[0013] In a further technical solution, a clearance hole is provided in the middle of the end cap. The clearance hole and the assembly cavity are coaxially arranged. One end of the rotating shaft passes through the clearance hole and extends to the outside of the end cap.

[0014] The advantages of this invention compared to the prior art after adopting the above structure are:

[0015] 1. The maze structure requires foreign objects to undergo multiple directional changes before they can penetrate, achieving dynamic barrier (measured barrier efficiency > 92%).

[0016] 2. The non-contact design between the end cap and the cover reduces frictional torque by approximately 37%, improving the energy efficiency of the hub motor.

[0017] 3. The chamfered annular groove design reduces the assembly difficulty of the end cap, further enhances the applicability of this anti-winding structure, and improves the assembly efficiency of the equipment.

[0018] 4. The hub motor structure with dual bearing design can further improve the concentricity between the shaft and the stator assembly, thereby achieving a smaller transition fit gap between the labyrinth ring and the annular groove, which plays a key role in improving anti-winding performance. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a cross-sectional view of the present invention.

[0022] Figure 3 yes Figure 2 Enlarged view of point A in the image.

[0023] Figure 4 yes Figure 2 Enlarged view of point B in the image. Detailed Implementation

[0024] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0025] To address the problem of poor anti-winding performance of existing hub motors, the inventors proposed a hub motor with a labyrinth structure.

[0026] like Figures 1 to 4 As shown, a hub motor with anti-winding function includes a rotor assembly and a stator assembly, which are coaxially rotatably coupled. The inner side of the rotor assembly is provided with a cover 5, and the outer side of the stator assembly is fixedly installed with an end cover 2. The edge of the cover 5 is provided with a first retaining ring 51 and a second retaining ring 52 spaced apart from the outside to the inside, and an annular groove 53 is formed between the first retaining ring 51 and the second retaining ring 52. The edge of the cover 5 is provided with an inwardly protruding cover rim, and the edge of the cover rim is formed with a labyrinth ring 21. The labyrinth ring 21 matches the annular groove 53 and is movably embedded in the annular groove 53, forming a transition fit with the inner wall of the annular groove 53 with a radial clearance of 0.1-0.3mm. The labyrinth ring 21 and the inner wall of the annular groove 53 form a non-linear channel, which includes a two-stage right-angle steering structure.

[0027] The maze structure requires foreign objects to undergo multiple directional changes before they can penetrate, achieving dynamic barrier with a measured barrier efficiency of >92%.

[0028] In addition, this non-contact design between the end cap 2 and the cover 5 can reduce frictional torque by about 37% and improve the energy efficiency of the hub motor.

[0029] Specifically, in this embodiment, the annular groove 53 has a groove depth of 3mm and a groove width of 2mm.

[0030] Specifically, the transition gap between the labyrinth ring 21 and the inner wall of the annular groove 53 is set in a gradient manner, with the gap near the entrances on both sides being smaller than the gap at the bottom.

[0031] Specifically, the inner and outer edges of the annular groove 53 are chamfered, and the edge cap 5 is assembled.

[0032] The chamfered annular groove 53 design reduces the assembly difficulty of the end cap 2, further enhances the applicability of this anti-winding structure, and improves the assembly efficiency of the equipment.

[0033] Specifically, the protrusion height of the first retaining ring 51 is less than the protrusion height of the second retaining ring 52.

[0034] Specifically, the inner edge of the cover 5 is provided with a first inverted buckle 54, the bottom of the first inverted buckle 54 is convex outward and forms an outward-facing snap-fit ​​part with the bottom surface of the cover 5; the rotor assembly also includes a rotor housing 11, the outer wall of the rotor housing 11 is injection molded with a tire part, the opening of the rotor housing 11 is provided with a second inverted buckle 111, the top of the second inverted buckle 111 is convex inward and forms an inverted buckle part, the inverted buckle part is snapped into the snap-fit ​​part to realize the fast connection assembly between the cover 5 and the rotor housing 11.

[0035] Specifically, the stator assembly includes a stator base 4, and a through-hole assembly cavity 40 is provided at the center of the stator base 4 for assembling a rotating shaft. A bearing 41 is fixed to the upper and lower parts of the assembly cavity 40 respectively, and the rotating shaft is inserted into the inner ring of the two bearings 41.

[0036] The hub motor structure with dual bearings can further improve the concentricity between the shaft 3 and the stator assembly, thereby enabling a smaller transition fit gap between the labyrinth ring and the annular groove, which plays a key role in improving anti-winding performance.

[0037] Specifically, the upper part of the rotating shaft is provided with a retaining ring 31, an elastic sealing ring 32 and a washer 33 from top to bottom. The elastic sealing ring 32 and the washer 33 are clamped on the upper side of the bearing 41 by the retaining ring 31, and the circumference of the elastic sealing ring 32 is fitted with the inner wall of the assembly cavity 40 to prevent the intrusion of external dust.

[0038] Specifically, an clearance hole 20 is provided in the middle of the end cover 2. The clearance hole 20 is coaxially arranged with the assembly cavity 40. One end of the rotating shaft passes through the clearance hole 20 and extends to the outside of the end cover 2.

[0039] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A wheel hub motor with anti-winding function, comprising a rotor assembly and a stator assembly, which are coaxially rotatably connected, the inner side of the rotor assembly is provided with a cover (5), and the outer side of the stator assembly is fixedly provided with an end cover (2), characterized in that: The edge portion of the cover (5) is provided with a first blocking ring (51) and a second blocking ring (52) from outside to inside, and an annular groove (53) is formed between the first blocking ring (51) and the second blocking ring (52); the edge portion of the cover (5) is provided with a cover eave protruding inward, and a labyrinth ring (21) is formed on the edge portion of the cover eave, the labyrinth ring (21) matches the annular groove (53), the labyrinth ring (21) is movably embedded in the annular groove (53), and a transition fit with a radial gap of 0.1-0.3mm is formed between the labyrinth ring (21) and the inner wall of the annular groove (53), the labyrinth ring (21) and the inner wall of the annular groove (53) form a non-linear channel containing two-stage right-angle turning structures.

2. The wheel hub motor with anti-winding function according to claim 1, characterized in that: The groove depth of the annular groove (53) is 2mm-5mm, and the groove width is 3mm-8mm.

3. The wheel hub motor with anti-winding function according to claim 2, characterized in that: The transition fit gap between the labyrinth ring (21) and the inner wall of the annular groove (53) is set in a gradient change manner, and the gap near the entrances of the two sides is smaller than the gap at the bottom.

4. The wheel hub motor with anti-winding function according to claim 3, characterized in that: The inner side edge and the outer side edge of the annular groove (53) are respectively provided with chamfers, and the edge cover (5) is assembled.

5. The wheel hub motor with anti-winding function according to claim 4, characterized in that: The protrusion height of the first blocking ring (51) is smaller than the protrusion height of the second blocking ring (52).

6. The wheel hub motor with anti-winding function according to claim 1, characterized in that: The edge of the inner side surface of the cover (5) is provided with a first reverse buckle ring (54), the bottom of the first reverse buckle ring (54) is outwardly protruding, and forms a buckle part with an opening outward with the bottom surface of the cover (5); the rotor assembly further includes a rotor shell (11), the outer wall of the rotor shell (11) is injection molded to form a tire part, the opening of the rotor shell (11) is provided with a second reverse buckle ring (111), the top of the second reverse buckle ring (111) is inwardly protruding, and forms a reverse buckle part, the reverse buckle part is connected to the buckle part, so as to realize the fastening connection assembly between the cover (5) and the rotor shell (11).

7. The wheel hub motor with anti-winding function according to claim 1, characterized in that: The stator assembly includes a stator seat (4), a through assembly cavity (40) is formed in the center position of the stator seat (4) for assembling a rotating shaft, and one bearing (41) is fixed to the upper part and the lower part of the assembly cavity (40) respectively, and the rotating shaft is inserted into the inner ring of the two bearings (41).

8. The wheel hub motor with anti-winding function according to claim 7, characterized in that: The upper part of the rotating shaft is sequentially provided with a circlip (31), an elastic seal ring (32) and a gasket (33) from top to bottom, the elastic seal ring (32) and the gasket (33) are clamped on the upper side of the bearing (41) by the circlip (31), and the circumferential part of the elastic seal ring (32) is gap-fitted with the inner wall of the assembly cavity (40) to block the invasion of external dust.

9. The wheel hub motor with anti-winding function according to claim 7, characterized in that: The middle position of the end cover (2) is provided with a relief hole (20), and the relief hole (20) and the assembly cavity (40) are coaxially arranged, one end of the rotating shaft passes through the relief hole (20) and extends to the outside of the end cover (2).

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