Transmission assembly and shared bicycle

Abstract

The utility model relates to a transmission assembly and a shared bicycle. The transmission assembly comprises a hub, a tower footing, a first sealing piece and a flywheel tooth piece. The first end of the hub is provided with a containing groove. The hub is used for being connected with a wheel. The tower footing comprises a main body structure and a ratchet mechanism, the ratchet mechanism is arranged at the first end of the main body structure and fixed in the containing groove, the tower footing and the hub are connected into an integrated structure, and the second end of the main body structure is located outside the containing groove; the first sealing piece is arranged on the main body structure and located at the notch of the containing groove, so that the ratchet mechanism is sealed in the containing groove; the flywheel tooth piece is arranged at the second end of the main body structure and can drive the tower footing to rotate, so that the tower footing can drive the hub to rotate through the ratchet mechanism. The transmission structure provided by the utility model has a better protection effect on the ratchet mechanism, and the transmission reliability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transportation vehicles, and more specifically, to a transmission assembly and a shared bicycle. Background Art

[0002] As a single component, the flywheel assembly is usually fixed to the rear hub through a threaded connection. The flywheel assembly operates independently and needs to independently face the harsh external operating environment (water / dust / impact, etc.). Therefore, it often rusts and gets stuck due to the harsh environment, causing abnormal riding noises or even inability to ride, seriously affecting the reliability and service life of the shared bicycle.

[0003] In view of this, there is an urgent need to design a transmission component with better protection effect. Utility Model Content

[0004] One purpose of the present utility model is to provide a transmission assembly and a shared bicycle.

[0005] According to a first aspect of the present invention, a transmission assembly is provided, which is applied to a vehicle and includes:

[0006] A hub, wherein a first end of the hub is provided with a receiving groove, and the hub is used to connect to a wheel;

[0007] a freewheel base, the freewheel base comprising a main structure and a ratchet mechanism, the ratchet mechanism being disposed at a first end of the main structure and fixed within the receiving groove, connecting the freewheel base and the hub as an integral structure, and a second end of the main structure being located outside the receiving groove;

[0008] a first sealing member, the first sealing member being provided on the main structure and being located at a notch of the receiving groove so as to seal the ratchet mechanism in the receiving groove;

[0009] The flywheel gear plate is arranged at the second end of the main structure and can drive the freewheel base to rotate, so that the freewheel base can drive the hub to rotate through the ratchet mechanism.

[0010] Optionally, it further includes: a retaining spring, the second end of the main body structure is provided with an assembly groove, and the flywheel gear is fixed to the assembly groove by the retaining spring.

[0011] Optionally, a plurality of arc-shaped grooves are provided in the assembly slot, and arc-shaped protrusions are respectively provided at positions of the flywheel gear pieces corresponding to the arc-shaped grooves, so that the flywheel gear pieces can drive the main structure to rotate.

[0012] Optionally, the main body structure is provided with a protruding structure at a notch of the accommodating groove, and the first sealing member is sandwiched between the ratchet mechanism and the protruding structure.

[0013] Optionally, it further includes: a fixed shaft and a plurality of bearings, the hub and the main structure are rotatably disposed on the fixed shaft through the bearings respectively, and both ends of the fixed shaft are respectively used to connect to the frame.

[0014] Optionally, it further includes: a second seal and a third seal, wherein the second seal and the third seal are respectively arranged on the outer side of the second end of the hub and the outer side of the second end of the main structure to seal the plurality of bearings.

[0015] Optionally, it also includes: a first baffle and a second baffle, the first baffle and the second baffle are respectively fixed on both sides of the flywheel gear plate, the flywheel gear plate is used to set up the vehicle's transmission chain, and the first baffle and the second baffle are used to prevent the transmission chain from falling off from both sides of the flywheel gear plate.

[0016] Optionally, it further includes: a plurality of fasteners, wherein the plurality of fasteners pass through the first baffle, the flywheel gear plate and the second baffle plate in sequence, so that the first baffle plate and the second baffle plate are detachably fixed to the flywheel gear plate.

[0017] Optionally, the shapes of the first baffle and the second baffle are consistent with the shape of the flywheel gear, and the outer diameters of the first baffle and the second baffle are both larger than the outer diameter of the flywheel gear;

[0018] A first gap and a second gap are respectively formed between the first blocking piece and the second blocking piece and the flywheel gear piece, and sizes of the first gap and the second gap are both smaller than the width of the transmission chain.

[0019] According to a second aspect of the present invention, a shared bicycle is provided, comprising the transmission assembly described in the first aspect.

[0020] One of the technical effects of the present invention is:

[0021] This utility model provides a receiving groove at the first end of the hub, wherein a ratchet mechanism mounted on the first end of the main structure is mounted within the receiving groove, forming a connection with the hub, and a flywheel sprocket is mounted on the second end of the main structure, thereby arranging a transmission chain to realize the transmission function of the transmission assembly as a whole. The ratchet mechanism is arranged within the receiving groove, thereby integrating the hub and the freewheel base into an integrated structure. A first sealing member is provided at the notch, effectively shielding and protecting the ratchet mechanism, enhancing the waterproof effect of the ratchet mechanism while maintaining the connection between the flywheel and the transmission chain, thereby ensuring the reliability of the transmission function of the transmission assembly.

[0022] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0024] Figure 1 It is a structural schematic diagram of a transmission component provided by the utility model.

[0025] Figure 2 yes Figure 1 Exploded diagram.

[0026] Figure 3 yes Figure 1 sectional view of .

[0027] Figure 4 yes Figure 1 main view.

[0028] Figure 5 yes Figure 1 side view.

[0029] Figure 6 It is an assembly diagram of the ratchet mechanism and the main structure.

[0030] Figure 7 yes Figure 6 main view.

[0031] Figure 8 It is a schematic diagram of the assembly of the flywheel gears and the main structure.

[0032] Figure 9 It is a structural diagram of the flywheel gear.

[0033] Description of reference numerals:

[0034] 1. Hub; 2. Freewheel body; 3. Circlip; 4. Freewheel sprocket; 5. First seal; 6. Fixed shaft; 7. Main structure; 8. Ratchet mechanism; 81. Ratchet structure; 82. Pawl; 83. Thread; 9. Third seal; 10. First baffle; 11. Second baffle; 12. Fastener; 13. Receiving groove; 14. Assembly groove; 15. Arc-shaped groove; 16. Protrusion structure; 17. Arc-shaped protrusion; 18. First bearing; 19. Second bearing; 20. Third bearing; 21. Fourth bearing; 22. Second seal. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0037] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0039] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] like Figures 1 to 9 As shown, according to the first aspect of the present invention, a transmission assembly is provided, which is applied to a vehicle, including: a hub 1, a tower base 2, a first seal 5, and a flywheel sprocket 4. The first end of the hub 1 is provided with a receiving groove 13, and the hub 1 is used to connect the wheel; the tower base 2 includes a main structure 7 and a ratchet mechanism 8, the ratchet mechanism 8 is provided at the first end of the main structure 7, and is fixed in the receiving groove 13, so that the tower base 2 and the hub 1 are connected as an integral structure, and the second end of the main structure 7 is located outside the receiving groove 13; the first seal 5 is provided on the main structure 7 and is located at the notch of the receiving groove 13, so that the ratchet mechanism 8 is sealed in the receiving groove 13; the flywheel sprocket 4 is provided at the second end of the main structure 7, and can drive the tower base 2 to rotate, so that the tower base 2 can drive the hub 1 to rotate through the ratchet mechanism 8.

[0041] Specifically, in practical applications, the hub 1 is used to connect to a bicycle wheel. When it serves as a transmission assembly, it is typically referred to as a rear hub, connected to the bicycle's rear wheel. The flywheel sprockets 4 are used to support a transmission chain. The flywheel sprockets 4 are connected to the hub 1 via a freehub base. When the transmission chain drives the flywheel sprockets 4 to rotate, the ratchet mechanism 8 on the freehub base 2 drives the hub 1 to rotate unidirectionally, thereby rotating the wheel.

[0042] In this embodiment, the main structure 7 is fixed in the receiving groove 13 by the ratchet mechanism 8, so that the tower base 2 and the hub 1 form an integrated structure, and the first seal 5 is arranged at the notch of the receiving groove 13. On the one hand, the outer wall of the receiving groove 13 can protect the ratchet mechanism 8 from external impact; on the other hand, the sealing of the first seal 5 prevents external rainwater, dust, etc. from entering the receiving groove 13, thereby preventing the ratchet mechanism from rusting, getting stuck, and other defects, thereby improving the reliability of the transmission; in addition, the flywheel tooth piece 4 is separately arranged at the second end of the main structure 7, and the second end is exposed outside the receiving groove 13 of the hub 1, which does not affect the assembly and transmission with the transmission chain, thereby achieving the purpose of preventing the ratchet mechanism 8, which is mainly used for rotational transmission, from being affected by the adverse external environment, and ensuring the long-lasting smoothness of the transmission component. Among them, the size and shape of the receiving groove 13 can be matched with the parameters of the ratchet mechanism 8, and the connection between the ratchet mechanism 8 and the hub 1 can be adopted. Figure 6 The thread 83 shown in the figure may also adopt other fixed connection forms, and the present invention is not limited to this.

[0043] In one embodiment, the structure of the ratchet mechanism 8 is as follows: Figure 6 As shown, it includes a ratchet structure 81 and multiple pawls 82. The multiple pawls can be movably assembled on the first end of the main structure 7 through structures such as torsion springs. The ratchet structure 81 is sleeved and assembled on the outside of the multiple clamps, and each pawl 82 can be plugged into the ratchet on the inside of the ratchet structure. The outer side of the ratchet structure 81 is fastened to the accommodating groove 13 by a thread 83.

[0044] The ratchet mechanism 8 operates based on the interaction between the pawl 82 and the ratchet teeth. When the main structure 7 rotates in one direction under the action of the flywheel sprocket 4, the pawl 82 is driven to engage the tooth groove of the ratchet structure 81, pushing the ratchet structure 81 to rotate in the same direction. This, in turn, causes the hub 1 connected to the ratchet structure 81 to rotate in the same direction, achieving wheel rotation. When the main structure 7 rotates in the opposite direction under the action of the flywheel sprocket 4, the pawl 82 slides over the backs of the ratchet teeth, causing the ratchet structure 81 to remain stationary. The hub 1 does not rotate the entire wheel, and further, when the wheel rotates in the opposite direction, it does not reverse the rotation of the flywheel sprocket 4.

[0045] In the above embodiment, by arranging the ratchet mechanism 8 in the receiving groove 13 of the hub 1, on the one hand, the tower base 2 and the hub 1 can be connected as one body, thereby achieving the purpose of the flywheel sprocket 4 driving the hub 1 to rotate. On the other hand, the hub 1 can shield the entire ratchet mechanism 8. At the same time, the first seal 5 can seal the receiving groove, which greatly avoids the risk of external rainwater, dust, etc. entering the ratchet mechanism 8, improves the protection effect of the ratchet mechanism 8 of the tower base 2, and reduces the problems of rust, jamming, etc. of the ratchet mechanism 8. The flywheel sprocket 4 is exposed to the hub 1, which simplifies the overall structure of the flywheel assembly in the prior art without affecting the transmission, thereby ensuring the reliability and service life of the vehicle riding.

[0046] Alternatively, as Figures 2 to 3 As shown, it also includes: a retaining spring 3 , a second end of the main structure 7 is provided with an assembly groove 14 , and the flywheel gear 4 is fixed in the assembly groove 14 through the retaining spring 3 .

[0047] Specifically, the retaining ring 3, also known as a retaining ring or a snap ring, is a mechanical part that uses its own elastic deformation to achieve the function of fixing, connecting or adjusting the position, and is a type of fastener 12. In this embodiment, the flywheel gear 4 is assembled in the assembly groove 14 of the main structure 7. The retaining ring 3 is arranged on one side of the flywheel gear 4 and uses its own elasticity to press the flywheel gear 4 tightly into the assembly groove 14, which not only simplifies the assembly of the flywheel gear 4, but also improves the reliability of the assembly of the flywheel gear 4 and the main structure 7. Among them, reference Figure 3 and Figure 7 The bottom of the annular assembly groove 14 on the main structure 7 can be set to a stepped shape (that is, the aperture of the flywheel gear 4 is larger than the aperture of the card exchange), the flywheel gear 4 is mounted on the higher step, and the retaining spring 3 is mounted on the lower step, so as to quickly locate the position of the flywheel gear 4 and the retaining spring 3 and improve the assembly efficiency.

[0048] Alternatively, as Figures 5 to 9 As shown, a plurality of arcuate grooves 15 are provided in the assembly groove 14 , and arcuate protrusions 17 are respectively provided at positions of the flywheel gear pieces 4 corresponding to the arcuate grooves 15 , so that the flywheel gear pieces 4 can drive the main structure 7 to rotate.

[0049] Specifically, in this embodiment, radial positioning of the flywheel sprocket 4 and the main structure 7 is achieved through the assembly of an arcuate groove 15 and an arcuate protrusion 17, improving assembly efficiency and simplifying assembly parts. The arcuate structure can reduce concentrated stress at the contact point between the flywheel sprocket 4 and the main structure 7, thereby increasing the service life of the flywheel sprocket 4. Alternatively, the arcuate protrusion 17 can be positioned within the assembly groove 14, and the arcuate groove 15 can be positioned on the flywheel sprocket 4. The number of arcuate grooves 15 and arcuate protrusions 17 can be designed and evenly distributed according to actual needs, for example, three or six, and this is not limited by the present invention.

[0050] Alternatively, as Figure 3 As shown, the main structure 7 is provided with a protruding structure 16 at the notch of the accommodating groove 13 , and the first sealing member 5 is sandwiched between the ratchet mechanism 8 and the protruding structure 16 .

[0051] Specifically, in this embodiment, the main structure 7 clamps the first sealing member 5 at the notch of the receiving groove 13 via the protruding structure 16, thereby sealing the receiving groove 13 and further improving the waterproof and dustproof properties of the ratchet mechanism 8 in the receiving groove 13. The provision of the protruding structure 16 can simplify the process, and the first sealing member 5 can be an elastic sealing ring.

[0052] Alternatively, as Figure 3 As shown, it also includes: a fixed shaft 6 and multiple bearings. The hub 1 and the main structure 7 are respectively rotatably sleeved on the fixed shaft 6 through the bearings. The two ends of the fixed shaft 6 are respectively used to connect to the frame.

[0053] Specifically, in this embodiment, both ends of the fixed shaft 6 are mounted on the frame to support the transmission assembly. Bearings replace the traditional bead groove structure, simplifying assembly while improving the stability and reliability of the transmission between the sprocket 4, freehub 2, and hub 1. In practice, the number of bearings can be designed based on actual needs.

[0054] In one embodiment, reference Figure 3 The two ends of the hub 1 can be rotatably connected to the fixed shaft 6 via a first bearing 18 and a second bearing 19, respectively. The first bearing 18 is provided at the end of the hub 1 away from the receiving groove 13, and the second bearing 19 is provided at a position of the hub 1 adjacent to the receiving groove 13 and close to the first bearing 18. The main structure 7 can be rotatably connected to the fixed shaft 6 via a third bearing 20 and a fourth bearing 21. The third bearing 20 can be provided on the side of the ratchet mechanism 8 close to the flywheel sprocket 4, and the fourth bearing 21 is provided at the end of the main structure 7 corresponding to the flywheel sprocket 4, so as to improve the compactness and rationality of the assembly.

[0055] Alternatively, as Figure 3 As shown, it also includes: a second seal 22 and a third seal 9, which are respectively arranged on the outside of the second end of the hub 1 and the outside of the second end of the main structure 7 to seal multiple bearings.

[0056] Specifically, in this embodiment, the second seal 22 and the third seal 9 are respectively provided at both ends of the fixed shaft 6 and sealed at the second end of the hub 1 and the second end of the main structure 7, so that each bearing is sealed inside the transmission assembly, thereby improving the protection performance of the transmission assembly. Figure 3 The second sealing member 22 and the third sealing member 9 are respectively arranged on the outside of the first bearing 18 and the outside of the fourth bearing 21. The second sealing member 22 and the third sealing member 9 can be elastic sealing rings or the like.

[0057] Alternatively, as Figures 1 to 5 As shown, it also includes: a first baffle 10 and a second baffle 11, the first baffle 10 and the second baffle 11 are respectively fixed on both sides of the flywheel gear plate 4, the flywheel gear plate 4 is used to set up the vehicle's transmission chain, and the first baffle 10 and the second baffle 11 are used to prevent the transmission chain from falling off from both sides of the flywheel gear plate 4.

[0058] Specifically, in practical applications, the transmission chain is prone to malfunctions such as chain drop during riding, compromising riding safety. In this embodiment, by providing a first stopper 10 and a second stopper 11 on either side of the flywheel sprocket 4, the chain is prevented from falling off the flywheel sprocket 4 in the event of chain loosening or deviation during operation, further improving transmission reliability and riding safety. Furthermore, the flywheel sprocket 4 is located separately on the outside of the hub 1, facilitating the installation of the first stopper 10 and the second stopper 11.

[0059] Alternatively, as Figure 3 and Figure 5 As shown, it also includes: a plurality of fasteners 12, which pass through the first baffle 10, the flywheel gear plate 4 and the second baffle 11 in sequence, so that the first baffle 10 and the second baffle 11 are detachably fixed to the flywheel gear plate 4.

[0060] Specifically, in this embodiment, the first and second baffles 10, 11 are detachably secured to the flywheel sprocket 4 via a plurality of fasteners 12. This allows the first and second baffles 10, 11 to rotate with the rotation of the flywheel sprocket 4, maintaining relative stillness. This prevents interference between the first and second baffles 10, 11 and the transmission chain, improving the reliability of the transmission assembly. Furthermore, if the first and second baffles 10, 11 are damaged, they can be readily replaced. The number of fasteners 12 can be three, four, or other suitable number, depending on actual needs.

[0061] Alternatively, as Figures 1 to 3 As shown, the shapes of the first baffle 10 and the second baffle 11 are consistent with the shape of the flywheel gear plate 4, and the outer diameters of the first baffle 10 and the second baffle 11 are both larger than the outer diameter of the flywheel gear plate 4; the first baffle 10 and the second baffle 11 have a first gap and a second gap respectively with the flywheel gear plate 4, and the sizes of the first gap and the second gap are both smaller than the width of the transmission chain.

[0062] Specifically, in this embodiment, the first baffle 10 and the second baffle 11 are both disc-shaped, consistent with the flywheel sprocket 4, and have an outer diameter greater than that of the flywheel sprocket 4. This prevents the transmission chain from falling toward the sides of the flywheel sprocket 4 when the chain is loose or deviates, allowing the transmission chain to remain mounted on the flywheel sprocket 4. Furthermore, the first gap and the second gap are designed to be smaller than the width of the transmission chain. This not only prevents the first baffle 10 and the second baffle 11 from interfering with the transmission of the transmission chain, but also prevents the transmission chain from falling into the first gap and the second gap. When the transmission chain is not severely deviated, it can be blocked by the first baffle 10 or the second baffle 11 back onto the flywheel sprocket 4, effectively preventing the chain from falling.

[0063] In the above embodiment, the size difference between the outer diameter of the first baffle 10 and the second baffle 11 and the flywheel gear plate 4 can be designed to be no greater than the height of the chain, which ensures that both can prevent the transmission chain from falling off and avoids the size of the first baffle 10 and the second baffle 11 being too large.

[0064] According to a second aspect of the present invention, a shared bicycle is provided, comprising the transmission assembly of the first aspect.

[0065] Specifically, the shared bicycle provided in this embodiment can use the transmission structure provided in the first aspect to drive the wheels. The transmission assembly provided in the first aspect provides better protection for the ratchet mechanism 8, thereby improving the reliability and safety of the vehicle and its service life. Furthermore, the transmission assembly can also be used on ordinary bicycles, and this is not a limitation of the present invention.

[0066] In one embodiment, the transmission assembly provided in the first aspect of the present application is used for transmission between the rear wheel and pedals of a bicycle, and the bicycle also includes a frame, a front wheel, a rear wheel, a pedal assembly, etc. After the hub 1 and the freehub 2 are connected as a whole through a ratchet mechanism 8, they are rotatably mounted on a fixed shaft 6 through multiple bearings, and the frame is fixed to both ends of the fixed shaft 6. The rear wheel is directly connected to the hub 1, and one end of the transmission chain is mounted on a sprocket connected to the crank (pedal assembly), and the other end is mounted on a flywheel sprocket 4. When the user steps on the pedal assembly, power can be transmitted to the flywheel sprocket 4 through the chain, and then the freehub 2 is driven to rotate through the flywheel sprocket 4, so that the ratchet mechanism 8 can drive the hub 1 to rotate, thereby realizing the rotation of the rear wheel and finally realizing the movement of the entire bicycle.

[0067] In the above structure, since the ratchet mechanism 8 is arranged in the accommodating groove 13, and the groove is provided with a first seal 5 to seal the accommodating groove, the ratchet mechanism 8 is not easily corroded by external rainwater, dust, etc., and the second end of the hub 1 and the outer side of the second end of the main structure are respectively provided with a second seal 22 and a third seal 9, so that the bearings where the hub 1 and the tower base 2 are connected to the fixed shaft 6 are also sealed inside the transmission assembly, avoiding the erosion of external adverse environments such as rainwater and dust, and improving the transmission reliability and driving safety of the bicycle as a whole.

[0068] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0069] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A transmission assembly, applied to a vehicle, characterized in that: include: A hub, wherein a first end of the hub is provided with a receiving groove, and the hub is used to connect to a wheel; a freewheel base, the freewheel base comprising a main structure and a ratchet mechanism, the ratchet mechanism being disposed at a first end of the main structure and fixed within the receiving groove, connecting the freewheel base and the hub as an integral structure, and a second end of the main structure being located outside the receiving groove; a first sealing member, the first sealing member being provided on the main structure and being located at a notch of the receiving groove so as to seal the ratchet mechanism in the receiving groove; The flywheel gear plate is arranged at the second end of the main structure and can drive the freewheel base to rotate, so that the freewheel base can drive the hub to rotate through the ratchet mechanism.

2. The transmission assembly according to claim 1, characterized in that: It also includes: a retaining spring, the second end of the main body structure is provided with an assembly groove, and the flywheel gear is fixed to the assembly groove through the retaining spring.

3. The transmission assembly according to claim 2, characterized in that: A plurality of arc-shaped grooves are provided in the assembly slot, and arc-shaped protrusions are respectively provided at positions of the flywheel gear pieces corresponding to the arc-shaped grooves, so that the flywheel gear pieces can drive the main structure to rotate.

4. The transmission assembly according to claim 1, characterized in that: The main body structure is provided with a protruding structure at the notch of the accommodating groove, and the first sealing member is sandwiched between the ratchet mechanism and the protruding structure.

5. The transmission assembly according to claim 1, characterized in that: It also includes: a fixed shaft and a plurality of bearings, the hub and the main structure are respectively rotatably sleeved on the fixed shaft through the bearings, and both ends of the fixed shaft are respectively used to connect to the frame.

6. The transmission assembly according to claim 5, characterized in that: It also includes: a second seal and a third seal, wherein the second seal and the third seal are respectively arranged on the outer side of the second end of the hub and the outer side of the second end of the main structure to seal the plurality of bearings.

7. The transmission assembly according to claim 1, characterized in that: It also includes: a first baffle and a second baffle, the first baffle and the second baffle are respectively fixed on both sides of the flywheel gear plate, the flywheel gear plate is used to set up the vehicle's transmission chain, and the first baffle and the second baffle are used to prevent the transmission chain from falling off from both sides of the flywheel gear plate.

8. The transmission assembly according to claim 7, characterized in that: It also includes: a plurality of fasteners, which pass through the first baffle, the flywheel gear and the second baffle in sequence, so that the first baffle and the second baffle are detachably fixed to the flywheel gear.

9. The transmission assembly according to claim 7, characterized in that: The shapes of the first baffle and the second baffle are consistent with the shape of the flywheel gear, and the outer diameters of the first baffle and the second baffle are both larger than the outer diameter of the flywheel gear; A first gap and a second gap are respectively formed between the first blocking piece and the second blocking piece and the flywheel gear piece, and sizes of the first gap and the second gap are both smaller than the width of the transmission chain.

10. A shared bicycle, characterized in that: The invention comprises the transmission assembly according to any one of claims 1 to 9.

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