A dustproof sealing assembly structure of a bicycle hub motor

Abstract

The application relates to the technical field of hub motor assembly, and discloses a dustproof sealing assembly structure of a bicycle drum shaft rear wheel hub motor, which comprises a wheel rim, a hub motor body arranged in the middle of the wheel rim, the hub motor body is composed of a hub shell, a stator shaft sleeve and a planetary gear set, a drum shaft is fixedly installed on the inner wall of the stator shaft sleeve, and an end cover is installed on the left end of the hub shell through bolts. The dustproof sealing assembly structure of the bicycle drum shaft rear wheel hub motor can effectively solve two prominent problems of the dustproof sealing structure of the hub motor in the prior art, that is, first, the sealing lip is subjected to long-term friction under the mud and sand dust environment, and fine sand particles are embedded in the sealing lip, accelerating wear, hardening and deformation; second, slight radial and axial movements are generated between the end cover and the stator shaft sleeve, a single radial seal is difficult to compensate for the dynamic displacement, and a small amount of mud and water invades the motor, leading to bearing rust, coil damp short circuit and magnetic steel corrosion.

Description

Technical Field

[0001] This invention relates to the field of hub motor assembly technology, specifically to a dustproof and sealed assembly structure for a bicycle thru-axle rear wheel hub motor. Background Technology

[0002] Hub motors are drive devices that integrate the motor body into the wheel hub. In rear wheel applications, the rotor housing also serves as the hub housing and connects to the wheel rim. The stator shaft or central bushing connects to the rear fork of the frame. When energized, the rotor housing rotates relative to the stator, directly driving the rear wheel. They feature a compact structure, short transmission chain, and easy maintenance. In slack-shaft rear wheel hub motors, the slack shaft passes through the inner hole of the stator shaft or central bushing of the hub motor to lock the rear wheel. The motor end cover is supported on the stator bushing by bearings and rotates with the wheel. Therefore, a dustproof sealing assembly structure must be installed in the mating area between the end cover's central hole and the stator bushing / slack shaft to prevent external mud, dust, and sand from entering the motor and protecting precision components such as windings, permanent magnets, bearings, and sensors. However, most dustproof sealing structures use a single skeleton oil seal, O-ring, or dust ring at the end cover's central hole, utilizing the sealing lip to form a radial seal with the outer circle of the stator bushing or slack shaft.

[0003] To address this, this application designs a dustproof sealing assembly structure for a bicycle thru-axle rear wheel hub motor. Existing dustproof sealing structures for hub motors have two prominent problems in actual riding and mass assembly: First, in muddy and dusty environments, the central area of ​​the end cap is directly exposed to the mud, water, and sand kicked up by the tires, causing the sealing lip to be subjected to long-term friction and embedding fine sand particles, accelerating wear, hardening, and deformation. Second, when the vehicle passes through bumpy, sharp bends, or under heavy loads, the rear fork and thru-axle of the frame undergo elastic deformation, resulting in slight radial and axial movement between the end cap and the stator bushing. A single radial seal is insufficient to compensate for this dynamic displacement, allowing trace amounts of mud and water to infiltrate the motor, leading to bearing corrosion, coil dampness and short circuits, and magnet corrosion. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a dustproof sealing assembly structure for a bicycle drum axle rear wheel hub motor. This structure effectively solves two prominent problems in existing dustproof sealing structures for hub motors: first, in muddy, dusty environments, the sealing lip is subjected to long-term friction, which can embed fine sand particles, accelerating wear, hardening, and deformation; second, minute radial and axial movement occurs between the end cover and the stator bushing, which a single radial seal cannot compensate for, allowing trace amounts of mud and water to infiltrate the motor, leading to bearing corrosion, coil dampness causing short circuits, and magnet corrosion.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor, comprising: The wheel rim has a hub motor body in the middle. The hub motor body consists of a hub housing, a stator bushing, a planetary gear set, and an internal gear ring. A cylindrical shaft is fixedly installed on the inner wall of the stator bushing. An end cover is installed on the left end of the hub housing by bolts. A flywheel seat is integrally installed on the left end of the end cover. A sealing and protective part is provided on both the hub housing and the flywheel seat. The hub housing is a barrel-shaped structure with an opening at the left end, and the hub housing has a round hole in the middle of the right end. The sealing and protection part includes an assembly groove at the right end of the hub housing and an assembly groove at the left end of the flywheel seat. The inner wall of the assembly groove has a threaded structure, and a T-shaped cover is threadedly connected to the inner wall of the assembly groove. The T-shaped cover is composed of a threaded cylinder and an annular plate. Several centrifugal grooves are evenly distributed in a circle at the opposite ends of the two T-shaped covers.

[0006] Furthermore, the inner wall of the hub housing is rotatably sleeved on the outer wall of the stator bushing via a bearing, the planetary gear set is disposed on the right side of the outer wall of the stator bushing via an annular cavity, the outer wall of the inner gear ring is fixedly connected to the right side of the inner wall of the hub housing, and the planetary gear set meshes with the inner gear ring.

[0007] Furthermore, the sealing and protection part also includes arc-shaped magnets embedded at the opposite ends of the annular plates on the left and right T-shaped covers, and arc-shaped magnets are also embedded at the right end of the hub housing and the left end of the flywheel seat. Several arc-shaped magnets are embedded, and the several arc-shaped magnets are evenly distributed in a circle. A composite sealing group is set on the left and right T-shaped covers respectively.

[0008] Furthermore, several arc-shaped magnets located on the left T-shaped cover are magnetically connected to the corresponding arc-shaped magnets on the flywheel seat, and several arc-shaped magnets located on the right T-shaped cover are magnetically connected to the corresponding arc-shaped magnets on the wheel hub housing.

[0009] Furthermore, the composite sealing assembly includes a dustproof ring detachably installed on the side of the inner wall of the T-shaped cover away from the wheel hub housing, a water-retaining ring detachably installed on the side of the inner wall of the T-shaped cover closer to the wheel hub housing, and a sealing ring detachably installed on the inner wall of the T-shaped cover between the dustproof ring and the water-retaining ring.

[0010] Furthermore, both the dustproof ring and the water-blocking ring have annular cavities on their inner walls.

[0011] Furthermore, the composite sealing assembly also includes a corresponding dustproof ring located on the inner wall of the T-shaped cover, and an installation cavity. Several installation cavities are provided, and the several installation cavities are evenly distributed around the circumference. A round-headed push rod is slidably installed on the inner wall of the installation cavity by a compression spring, and one round end of the round-headed push rod elastically abuts against the outer wall of the dustproof ring.

[0012] Furthermore, a tire is fixedly fitted on the outer wall of the wheel rim, and several spokes evenly distributed in a circle are fixedly connected to the outer wall of the wheel hub housing. The end of the spokes away from the wheel hub housing is fixedly connected to the inner wall of the wheel rim.

[0013] The technical solution provided by this invention has the following advantages compared with the prior art: This invention provides a dustproof sealing assembly structure for a bicycle drum axle rear wheel hub motor. During the mud, water, and sand removal stage, when the wheel rotates, the centrifugal groove at the outer end of the T-shaped cover rotates at high speed. Mud, water, and sand particles entering the centrifugal groove are thrown outward along the inner wall of the centrifugal groove under the action of centrifugal force, and will not stay near the T-shaped cover for a long time. Through the active removal action of the centrifugal groove, most of the mud, water, and sand are thrown away before they come into contact with the dustproof ring, reducing the friction of the seal and the risk of sand particles getting embedded, and extending the service life of the dustproof ring and the sealing ring.

[0014] During the dynamic displacement compensation phase, when the vehicle goes over potholes, makes sharp turns, or carries a heavy load, the rear fork and thru-axle of the frame will deform slightly. The end cap and flywheel seat, along with the T-shaped cap, will experience very small radial and axial displacement relative to the stator bushing. At this time, the round-head push rod and compression spring will push the dust seal to continue to press tightly against the axle surface. The annular cavity of the sealing ring and water-retaining ring will undergo elastic deformation to absorb the displacement. Through the synergistic effect of elastic pre-tightening and cavity deformation compensation, the sealing structure can adapt to dynamic displacement, preventing mud and water from entering the motor and avoiding bearing rust, coil moisture short circuits, and magnet corrosion. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure in an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the hub motor body and sealing protection part in a bicycle actual application scenario according to the embodiment of the present invention. Figure 3 This is a schematic diagram of a partial three-dimensional cross-section of the hub motor body and the sealing protection part in an embodiment of the present invention; Figure 4 For the present invention Figure 3 A magnified structural diagram of section X in the middle; Figure 5 This is a schematic diagram of the three-dimensional separation of the hub motor body, cylinder shaft, end cover, and flywheel seat in an embodiment of the present invention; Figure 6 This is a right-side structural schematic diagram of a partial cross-section of the hub motor body in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram showing the separation of the end cap, flywheel seat, and sealing protection part in an embodiment of the present invention; Figure 8 For the present invention Figure 7 A magnified structural diagram of the area at point Y in the middle; Figure 9 This is a three-dimensional structural diagram of the separation of the hub housing and the sealing protection part in an embodiment of the present invention; Figure 10 For the present invention Figure 9 A magnified structural diagram of the area at point Z in the middle; Figure 11 This is a schematic diagram of a partial three-dimensional cross-section of the T-shaped cover and the composite sealing assembly in an embodiment of the present invention.

[0017] The labels in the diagram represent: 1. Wheel rim; 2. Tire; 3. Hub motor body; 31. Hub housing; 32. Stator bushing; 33. Planetary gear set; 34. Internal gear ring; 4. Spokes; 5. Cylindrical shaft; 6. End cover; 7. Flywheel seat; 8. Sealing and protection part; 81. T-shaped cover; 82. Centrifugal groove; 83. Arc magnet; 84. Composite sealing assembly; 841. Dustproof ring; 842. Sealing ring; 843. Water baffle ring; 844. Mounting cavity; 845. Round-headed top rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments. Example

[0020] Please see Figures 1-11 This invention provides a technical solution: a dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor, comprising: The wheel rim 1 has a hub motor body 3 in the middle. The hub motor body 3 is composed of a hub housing 31, a stator bushing 32, a planetary gear set 33, and an internal gear ring 34. A cylindrical shaft 5 is fixedly installed on the inner wall of the stator bushing 32. An end cover 6 is installed on the left end of the hub housing 31 by bolts. A flywheel seat 7 is integrally installed on the left end of the end cover 6. A sealing and protective part 8 is provided on both the hub housing 31 and the flywheel seat 7. Among them, the hub housing 31 is a barrel-shaped structure with an opening at the left end, and the hub housing 31 has a round hole in the middle of the right end; The sealing and protection part 8 includes an assembly groove at the right end of the hub housing 31 and an assembly groove at the left end of the flywheel seat 7. The inner wall of the assembly groove has a threaded structure, and a T-shaped cover 81 is threadedly connected to the inner wall of the assembly groove. The T-shaped cover 81 is composed of a threaded cylinder and an annular plate. Several centrifugal grooves 82 are evenly distributed in a circle at the opposite ends of the two T-shaped covers 81.

[0021] The inner wall of the hub housing 31 is rotatably sleeved on the outer wall of the stator bushing 32 via a bearing. The planetary gear set 33 is disposed on the right side of the outer wall of the stator bushing 32 through an annular cavity. The outer wall of the internal gear ring 34 is fixedly connected to the right side of the inner wall of the hub housing 31. The planetary gear set 33 meshes with the internal gear ring 34.

[0022] The sealing and protection part 8 also includes arc-shaped magnets 83 embedded at the opposite ends of the annular plates on the left and right T-shaped covers 81. Arc-shaped magnets 83 are also embedded at the right end of the hub housing 31 and the left end of the flywheel seat 7. Several arc-shaped magnets 83 are embedded, and the several arc-shaped magnets 83 are evenly distributed in a circle. Composite sealing groups 84 are respectively provided on the left and right T-shaped covers 81.

[0023] Several arc-shaped magnets 83 located on the left T-shaped cover 81 are magnetically connected to the corresponding arc-shaped magnets 83 on the flywheel seat 7, and several arc-shaped magnets 83 located on the right T-shaped cover 81 are magnetically connected to the corresponding arc-shaped magnets 83 on the hub housing 31.

[0024] The composite sealing assembly 84 includes a dustproof ring 841 detachably installed on the side of the inner wall of the T-shaped cover 81 away from the hub housing 31, a water-retaining ring 843 detachably installed on the side of the inner wall of the T-shaped cover 81 close to the hub housing 31, and a sealing ring 842 detachably installed on the inner wall of the T-shaped cover 81 between the dustproof ring 841 and the water-retaining ring 843.

[0025] Both the dustproof ring 841 and the water-retaining ring 843 have annular cavities on their inner walls.

[0026] The composite sealing assembly 84 also includes a mounting cavity 844 located on the inner wall of the T-shaped cover 81 corresponding to the dustproof ring 841. Several mounting cavities 844 are evenly distributed around the circumference, and a round-headed push rod 845 is slidably mounted on the inner wall of the mounting cavity 844 by a compression spring. One end of the round head of the round-headed push rod 845 elastically abuts against the outer wall of the dustproof ring 841.

[0027] A tire 2 is fixedly fitted on the outer wall of the wheel rim 1, and several spokes 4 are fixedly connected to the outer wall of the wheel hub housing 31 in a circumferentially evenly distributed manner. The end of the spoke 4 away from the wheel hub housing 31 is fixedly connected to the inner wall of the wheel rim 1.

[0028] In practice: Firstly, this application provides a convenient and reliable dustproof sealing assembly structure for the rear wheel hub motor of a bicycle thru-axle 5. Through the cooperation of a T-shaped cover 81, an arc-shaped magnet 83, a composite sealing assembly 84, and a round-headed push rod 845, combined with the centrifugal force of the centrifugal groove 82, the sealing failure problem of traditional single-channel radial seals under muddy, dusty, and dynamic conditions is avoided. Specifically, the arc-shaped magnet 83 is used for anti-loosening positioning of the T-shaped cover 81; the composite sealing assembly 84 forms multiple barriers for dustproofing, sealing, and water blocking, jointly preventing external impurities from entering the hub motor body 3; and the round-headed push rod 845 provides continuous radial preload. Whenever the wheel rotates, the centrifugal groove 82 throws away mud, water, and dust, thereby achieving reliable sealing under all operating conditions.

[0029] During the assembly of the bicycle rear wheel assembly, the operator first fixes the tire 2 onto the outer wall of the rim 1 and checks whether the tire bead is evenly inserted into the groove. Then, several spokes 4 are taken, one end is locked to the inner wall of the rim 1 with a spoke 4 nut, and the other end is connected to the spoke 4 opening on the outer wall of the hub housing 31. They are evenly distributed in the circumferential direction and gradually tightened to keep the rim 1 and the hub housing 31 concentric. Since the hub housing 31 is a barrel-shaped part with an opening on the left and a round hole in the middle on the right, the entire wheel assembly can rotate smoothly, forming a stable rear wheel assembly base. This gives the hub motor body 3 a reliable mounting carrier and avoids the sealing interface from shifting due to loose wheel assembly connections.

[0030] During the assembly stage of the hub motor body 3, the operator inserts the stator bushing 32 through the left end opening of the hub housing 31. Both ends are supported by bearings on the inner wall of the hub housing 31, allowing the stator bushing 32 to rotate flexibly relative to the hub housing 31. Next, the planetary gear set 33 is installed on the right side of the outer wall of the stator bushing 32. Then, the internal gear ring 34 is pressed into the right side of the inner wall of the hub housing 31, allowing the gears of the planetary gear set 33 to mesh normally with the internal gear ring 34. Finally, the cylindrical shaft 5 is inserted into the inner hole of the stator bushing 32 from the left end and locked in place, making the cylindrical shaft 5 and the stator bushing 32 a single unit. This ensures that the internal transmission chain of the hub motor body 3 is installed in place, the cylindrical shaft 5 and the stator bushing 32 form a stable support shaft, and the end cover 6 and flywheel seat 7 can rotate smoothly around it in the future. The working shaft surface of the seal is accurately and reliably positioned.

[0031] During the assembly of end cover 6 and flywheel seat 7, the operator continues to fasten end cover 6 from the left end of hub housing 31. During this process, the bolt holes must be aligned and the bolts tightened one by one to fix end cover 6 and hub housing 31 together. Flywheel seat 7 will be installed in place along with end cover 6 without the need for separate alignment. Flywheel seat 7 can rotate around stator bushing 32 together with end cover 6 and hub housing 31. By using end cover 6, flywheel seat 7 and hub housing 31 as a whole and rotating synchronously, the sealing surface will not jump due to assembly gaps, providing a stable installation reference for sealing protection part 8 and avoiding misalignment of sealing surface due to assembly gaps.

[0032] It should be noted that the round-headed push rods 845 are pre-installed in several mounting cavities 844 on the T-shaped cover 81 by compression springs.

[0033] During the assembly stage of the sealing and protection section 8, the operator first inspects the threads inside the right round hole of the hub housing 31 and the left hole of the flywheel seat 7, cleaning off oil stains and burrs. Then, the operator removes the right T-shaped cover 81 with the composite sealing assembly 84 already installed, aligns the threaded cylinder with the threaded hole at the right end of the hub housing 31, screws it in by hand a few turns, and then tightens it with a special wrench. Similarly, this operation needs to be repeated to screw the left T-shaped cover 81 into the threaded hole at the left end of the flywheel seat 7. Both T-shaped covers 81 have centrifugal grooves 82 on their outward-facing rings. At this time, the centrifugal grooves 82 face outwards, and the composite sealing assembly 84 on the inner wall of the left and right T-shaped covers 81 is respectively fitted onto the outer wall of the stator bushing 32 or the cylinder shaft 5. The T-shaped covers 81 are reliably pressed onto the hub housing 31 and the flywheel seat 7 by the threads, with the centrifugal grooves 82 facing outwards. Whenever the wheel rotates, it can actively shake off mud, water, and sand, reducing the risk of the seals being directly exposed to the harsh environment.

[0034] During the magnetic positioning stage, since the opposite surfaces of the annular plates of the two T-shaped covers 81 on the left and right sides are already embedded with arc magnets 83, and the corresponding positions of the right end of the hub housing 31 and the left end of the flywheel seat 7 are also embedded with arc magnets 83, when the T-shaped covers 81 are screwed in place, the arc magnets 83 on the opposite surfaces automatically align and attract each other. Several arc magnets 83 are evenly distributed along the circumference, and the arc magnets 83 provide continuous circumferential positioning and anti-loosening force for the T-shaped covers 81. When the vehicle vibrates for a long time, the T-shaped covers 81 will not slowly come loose, thus avoiding the overall loosening of the sealing structure.

[0035] During the wheel rotation operation, when the rider pedals, the flywheel seat 7 will drive the end cover 6, hub housing 31, wheel rim 1 and tire 2 to rotate together around the stator bushing 32 and the cylinder shaft 5. The internal gear ring 34 will rotate synchronously with the hub housing 31 and transmit power through the planetary gear set 33. The two T-shaped covers 81 on the left and right will also rotate synchronously. The composite sealing group 84 forms a rotational dynamic seal relative to the stator bushing 32 or the cylinder shaft 5. By adopting the method of the entire sealing structure rotating synchronously with the wheel, the bearings, windings, permanent magnets and sensors inside the hub motor body 3 are always isolated from the external mud and water, and the motor runs stably.

[0036] During the mud, water, sand, and dust removal stage, when the wheel rotates, the centrifugal groove 82 at the outer end of the T-shaped cover 81 will rotate at high speed with the movement. The mud, water, and sand particles that enter the centrifugal groove 82 will be thrown outward along the inner wall of the centrifugal groove 82 under the action of centrifugal force, and will not stay near the T-shaped cover 81 for a long time. Most of the mud, water, sand, and dust will be thrown away before they even come into contact with the dustproof ring 841, reducing the friction of the seal and the risk of sand particles getting embedded, and extending the service life of the dustproof ring 841 and the sealing ring 842.

[0037] During the dynamic displacement compensation phase, when the vehicle goes over potholes, sharp bends, or is heavily loaded, the rear fork and thru-axle 5 of the frame will deform slightly, and the end cap 6 and flywheel seat 7, along with the T-shaped cap 81, will experience very small radial and axial displacement relative to the stator bushing 32. At this time, the round-head push rod 845 and the compression spring will push the dustproof ring 841 to continue to press against the shaft surface, and the annular cavity of the sealing ring 842 and the water-blocking ring 843 will undergo elastic deformation to absorb the displacement. The sealing structure in this application can adapt to dynamic displacement, and mud and water will not enter the motor through the gap, thus avoiding bearing rust, coil moisture short circuit, and magnet corrosion.

[0038] During the maintenance and replacement phase, when it is necessary to replace the seals, the operator first unscrews the two T-shaped covers 81 on the left and right sides to separate the arc-shaped magnet 83. Then, the old dustproof ring 841, sealing ring 842, and water-retaining ring 843 are removed from the inner wall of the T-shaped cover 81 in sequence. The new dustproof ring 841, sealing ring 842, and water-retaining ring 843 are then installed. Finally, the T-shaped cover 81 is screwed back into the corresponding threaded hole, and the arc-shaped magnet 83 automatically engages and positions itself. When maintaining the wheel sealing structure, it is not necessary to disassemble the wheel hub motor body 3 and end cover 6. All seals can be replaced by removing only the T-shaped cover 81. The operation is simple, time-saving, and labor-saving.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor, characterized in that, include: The wheel rim (1) has a hub motor body (3) in the middle. The hub motor body (3) consists of a hub housing (31), a stator bushing (32), a planetary gear set (33), and an internal gear ring (34). A cylindrical shaft (5) is fixedly installed on the inner wall of the stator bushing (32). An end cover (6) is installed on the left end of the hub housing (31) by bolts. A flywheel seat (7) is integrally installed on the left end of the end cover (6). A sealing and protective part (8) is provided on both the hub housing (31) and the flywheel seat (7). The hub housing (31) is a barrel-shaped structure with an opening at the left end, and the hub housing (31) has a round hole at the middle of the right end; The sealing and protective part (8) includes an assembly groove at the right end of the hub housing (31) and an assembly groove at the left end of the flywheel seat (7). The inner wall of the assembly groove has a threaded structure, and a T-shaped cover (81) is threadedly connected to the inner wall of the assembly groove. The T-shaped cover (81) is composed of a threaded cylinder and an annular plate. Several centrifugal grooves (82) are evenly distributed in a circle at the opposite ends of the two T-shaped covers (81).

2. The dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor according to claim 1, characterized in that: The inner wall of the hub housing (31) is rotatably sleeved on the outer wall of the stator bushing (32) through a bearing. The planetary gear set (33) is set on the right side of the outer wall of the stator bushing (32) through an annular cavity. The outer wall of the internal gear ring (34) is fixedly connected to the right side of the inner wall of the hub housing (31). The planetary gear set (33) meshes with the internal gear ring (34).

3. The dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor according to claim 1, characterized in that: The sealing and protective part (8) also includes arc magnets (83) embedded at the opposite ends of the annular plates on the left and right T-shaped covers (81), and arc magnets (83) are also embedded at the right end of the hub housing (31) and the left end of the flywheel seat (7). Several arc magnets (83) are embedded, and the several arc magnets (83) are evenly distributed in a circle. Composite sealing groups (84) are respectively provided on the left and right T-shaped covers (81).

4. The dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor according to claim 3, characterized in that: Several arc-shaped magnets (83) on the left-side T-shaped cover (81) are magnetically connected to the corresponding arc-shaped magnets (83) on the flywheel seat (7), and several arc-shaped magnets (83) on the right-side T-shaped cover (81) are magnetically connected to the corresponding arc-shaped magnets (83) on the hub housing (31).

5. The dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor according to claim 3, characterized in that: The composite sealing assembly (84) includes a dustproof ring (841) detachably installed on the side of the inner wall of the T-shaped cover (81) away from the hub housing (31), a water baffle ring (843) detachably installed on the side of the inner wall of the T-shaped cover (81) close to the hub housing (31), and a sealing ring (842) detachably installed on the inner wall of the T-shaped cover (81) between the dustproof ring (841) and the water baffle ring (843).

6. The dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor according to claim 5, characterized in that: Both the dustproof ring (841) and the water-blocking ring (843) have annular cavities on their inner walls.

7. The dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor according to claim 6, characterized in that: The composite sealing assembly (84) also includes a corresponding dustproof ring (841) on the inner wall of the T-shaped cover (81), and an installation cavity (844) is opened. The installation cavity (844) has several openings, and the several installation cavities (844) are evenly distributed around the circumference. A round-headed top rod (845) is slidably installed on the inner wall of the installation cavity (844) by a compression spring. One end of the round head of the round-headed top rod (845) elastically abuts against the outer wall of the dustproof ring (841).

8. The dustproof and sealing assembly structure for a bicycle thru-axle rear wheel hub motor according to claim 1, characterized in that: The wheel rim (1) is fixedly fitted with a tire (2), and a number of spokes (4) evenly distributed in a circle are fixedly connected to the outer wall of the hub housing (31). The end of the spoke (4) away from the hub housing (31) is fixedly connected to the inner wall of the wheel rim (1).

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