Driving structure and hub-free bicycle

Abstract

The utility model relates to the technical field of bicycles, in particular to a driving structure and a hub-free bicycle. The driving structure comprises a first wheel frame, a driving wheel, at least two first bearings, an inner gear ring and a driving mechanism, the first bearings are axially arranged on the inner ring wall of the driving wheel at intervals, the inner rings of the first bearings are connected with the first wheel frame, and the outer rings of the first bearings are connected with the driving wheel; an annular groove allowing the inner gear ring to be embedded is formed between every two adjacent first bearings, the driving mechanism comprises a gear disc, and the gear disc is rotationally installed on the first wheel frame and meshed with the inner gear ring to drive the driving wheel to rotate. Relative rotation of the first wheel frame and the driving wheel can be achieved through the two first bearings arranged at intervals in the axial direction, meanwhile, axial movement of the inner gear ring can be prevented, the gear disc and the inner gear ring can be stably meshed, then the driving wheel is made to rotate stably, the number of the bearings used in the structural design is small, and the structure is simple. And the assembly efficiency can be improved to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycles, in particular to a driving structure and a hubless bicycle. Background Art

[0002] Bicycles are an environmentally friendly means of transportation for commuting and traveling. Hubless bicycles are lightweight bicycles developed by combining modern engineering with conventional bicycles, eliminating the hub structure. Currently available hubless bicycles consist of a frame, a drive structure, and a driven structure mounted on the frame. The drive structure includes a drive wheel and a drive mechanism. The drive wheel utilizes multiple first bearings whose rotation direction aligns with the friction force and multiple second bearings whose rotation direction is perpendicular to the friction force to ensure smooth wheel rotation. However, the arrangement of these first and second bearings results in a complex drive structure with multiple components, making installation more complex. Utility Model Content

[0003] To solve the above problems, the present invention provides a rear drive wheel and a hubless bicycle, which adopt large bearings to promote stable rotation of the wheel, and can effectively reduce the number of bearings, thereby improving assembly efficiency to a certain extent.

[0004] In the first aspect, the utility model provides a driving structure, including a first wheel frame, a driving wheel, a first bearing, an inner gear ring and a driving mechanism, at least two first bearings are axially spaced apart on the inner ring wall of the driving wheel, the inner ring of the first bearing is connected to the first wheel frame, the outer ring of the first bearing is connected to the driving wheel, and an annular groove for the inner gear ring to be embedded is formed between every two adjacent first bearings, and the driving mechanism includes a gear plate, which is rotatably mounted on the first wheel frame and meshes with the inner gear ring to drive the driving wheel to rotate.

[0005] Optionally, the first wheel frame includes a first front side frame and a first rear side frame that are docked with each other, and a first installation cavity is formed after the first front side frame and the first rear side frame are docked, and the inner ring of the drive wheel and the first bearing are both located in the first installation cavity.

[0006] Optionally, the first wheel frame further includes a first sealing strip, and the first sealing strip is sealingly clamped in a gap formed by the first front side frame and the first rear side frame.

[0007] Optionally, the driving wheel includes a first wheel frame, a first base and a first carcass, the outer annular wall of the first wheel frame is provided with a first slot for the first base to be inserted into, the first carcass is connected to the side of the first base away from the first wheel frame, and the inner ring gear and the first bearing are both installed on the inner annular wall of the first wheel frame.

[0008] Optionally, the driving mechanism also includes a driving shaft, a driven shaft, planetary gears, a chainring, a flywheel and a transmission belt, the driving shaft and the driven shaft are installed on the first wheel frame at intervals, the planetary gears and the chainring are fixedly mounted on the driving shaft, the flywheel and the gear plate are fixedly mounted on the driven shaft, and the transmission belt is connected between the chainring and the flywheel.

[0009] In a second aspect, the present invention provides a hubless bicycle comprising a frame, the driving structure and the driven structure as described above.

[0010] Optionally, a battery, a control panel and a motor are provided on the vehicle frame, the battery is connected to the control panel and the motor respectively, and the motor is located on one side of the driving structure and is drivingly connected to the driving mechanism.

[0011] Optionally, the driven structure includes a second wheel carrier, a driven wheel and a second bearing, the inner ring of the second bearing is connected to the second wheel carrier, and the outer ring of the second bearing is connected to the driven wheel.

[0012] Optionally, the second wheel frame includes a second front side frame and a second rear side frame that are docked with each other, and a second installation cavity is formed after the second front side frame and the second rear side frame are docked, and the inner ring of the driven wheel and the second bearing are both located in the second installation cavity.

[0013] Optionally, the second wheel frame further includes a second sealing strip, and the second sealing strip is sealingly clamped in a gap formed by the second front side frame and the second rear side frame.

[0014] The cup cover with a suction nozzle and the cup cover of the utility model have the following beneficial effects:

[0015] 1. In the drive structure of the present invention, the relative rotation between the first wheel carrier and the drive wheel can be achieved by two first bearings spaced apart along the axial direction, and the axial movement of the inner gear ring can be prevented, so that the gear plate and the inner gear ring can be stably engaged, thereby promoting the smooth rotation of the drive wheel. The above structural design uses a small number of bearings, which can improve assembly efficiency to a certain extent.

[0016] 2. In the drive structure of the present invention, the first wheel frame helps to further improve the assembly efficiency of the first bearing through the arrangement of the first front side frame and the second front side frame. Combined with the first sealing strip, the sealing effect of the first wheel frame is ensured, and foreign matter is reduced from entering the first wheel frame to ensure the effective rotation of the first bearing.

[0017] 3. The hubless bicycle of the present invention combines a battery, a control panel and a motor on the basis of the above-mentioned driving structure, thereby reducing the riding burden of the user.

[0018] 4. In the hubless bicycle of the present invention, the driven structure also adopts a large bearing to realize the relative rotation between the second wheel carrier and the driven wheel. Its structure is simple and can effectively reduce the number of bearing components, which helps to further improve the production efficiency of the hubless bicycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the driving structure in the first embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the explosion structure of the driving structure in the first embodiment of the present invention. Figure 1 .

[0021] Figure 3 This is a schematic diagram of the explosion structure of the driving structure in the first embodiment of the present invention. Figure 2 , whose viewing direction is Figure 2 The reverse of .

[0022] Figure 4 It is a cross-sectional view of one side of the driving structure in the first embodiment of the present invention parallel to the axial direction.

[0023] Figure 5 It is a structural schematic diagram of a hubless bicycle in the second embodiment of the present utility model.

[0024] Figure 6 This is a schematic diagram of the explosion structure of the hubless bicycle in the second embodiment of the present invention. Figure 1 .

[0025] Figure 7 This is a schematic diagram of the explosion structure of the hubless bicycle in the second embodiment of the present invention. Figure 2 , whose viewing direction is Figure 6 The reverse of .

[0026] Figure 8 This is a schematic diagram of the explosion structure of the driven structure in the second embodiment of the present invention. Figure 1 .

[0027] Figure 9 This is a schematic diagram of the explosion structure of the driven structure in the second embodiment of the present invention. Figure 2 , whose viewing direction is Figure 8 The reverse of .

[0028] Figure 10 It is a cross-sectional view of one side of the driven structure in the second embodiment of the present invention parallel to the axial direction.

[0029] Description of reference numerals:

[0030] 1. Drive structure; 11. First wheel frame; 111. First front side frame; 112. First rear side frame; 113. First sealing strip; 12. Drive wheel; 121. First wheel frame; 1211. First ring plate; 1212. First connecting plate; 1213. First slot; 122. First base; 123. First carcass; 13. First bearing; 14. Internal gear ring; 15. Drive mechanism; 151. Gear plate; 152. Driving shaft; 153. Driven shaft; 154. Planetary gear; 155. Tooth plate; 156. Flywheel; 157. Transmission Drive belt; 16. Annular groove; 17. First mounting cavity; 2. Vehicle frame; 21. Skeleton; 22. Front frame body; 23. Rear frame body; 3. Driven structure; 31. Second wheel frame; 311. Second front side frame; 312. Second rear side frame; 313. Second sealing strip; 32. Driven wheel; 321. Second wheel frame; 3211. Second annular plate; 3212. Second connecting plate; 3213. Second slot; 322. Second base; 323. Second carcass; 33. Second bearing; 34. Second mounting cavity; 4. Battery; 5. Control panel; 6. Motor. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings herein may be arranged and designed in a variety of different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. The drawings of the embodiments of the present invention are provided with a coordinate system XYZ, wherein the positive direction of the X-axis represents the left, the negative direction of the X-axis represents the right, the positive direction of the Y-axis represents the front, the negative direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom.

[0036] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0037] Example 1

[0038] The first embodiment of the present invention provides a driving structure, combined with Figure 1 、 Figure 2 and Figure 3 , including a first wheel carrier 11, a driving wheel 12, a first bearing 13, an inner ring gear 14 and a driving mechanism 15.

[0039] At least two first bearings 13 are axially spaced apart on the inner annular wall of the drive wheel 12. The number of first bearings 13 can be two, three, or four, depending on the needs. This embodiment uses two first bearings 13 as an example. The inner rings of the two first bearings 13 are fixedly connected to the first wheel carrier 11, and the outer rings of the two first bearings 13 are fixedly connected to the drive wheel 12. An annular groove 16 is formed between two adjacent first bearings 13, into which the inner ring gear 14 is inserted. The inner ring gear 14 is fixedly mounted on the inner annular wall of the drive wheel 12 and clamped between the two first bearings 13. This prevents axial movement of the inner ring gear 14 and increases its installation stability. The drive mechanism 15 includes a gear plate 151, which is rotatably mounted on the first wheel carrier 11 and meshes with the inner ring gear 14 to drive the drive wheel 12. Since the inner gear ring 14 is embedded in the annular groove 16, the engagement between the gear plate 151 and the inner gear ring 14 is carried out in the annular groove 16. At this time, the first bearing 13 can also axially limit the gear plate 151 to a certain extent, thereby improving the engagement stability between the gear plate 151 and the inner gear ring 14, thereby promoting the smooth rotation of the drive wheel 12.

[0040] The design of the two first bearings 13 in this embodiment not only enables the relative rotation of the first wheel frame 11 and the drive wheel 12, but is also sufficient to effectively limit the inner ring gear 14 and the gear plate 151, while also achieving the purpose of being light and reducing the assembly workload. The small number of bearings used can improve the assembly efficiency of the drive structure 1 to a certain extent.

[0041] Optionally, combined Figure 2, Figure 3 and Figure 4 , in this embodiment, the first wheel carrier 11 includes a first front side carrier 111 and a first rear side carrier 112 that are butted against each other. The "butt joint" means that the edges where the first front side carrier 111 and the first rear side carrier 112 are abutted against each other are completely fitted. Specifically, it can be connected by snap connection, or by fasteners, etc., or the two can be combined to finally form a complete wheel carrier. After the first front side carrier 111 and the first rear side carrier 112 are butted, a ring-shaped first installation cavity 17 is formed. The inner ring of the driving wheel 12 and the first bearing 13 are both located in the first installation cavity 17. Thus, not only is it convenient for the installation of the driving wheel 12 and the first bearing 13 and the subsequent maintenance and replacement, but it can also protect the driving wheel 12 and the first bearing 13 from damage by the external environment, improve the service life, and in addition, it can also increase the structural stability among the three.

[0042] Optionally, the first wheel carrier 11 further includes a first sealing strip 113. The first sealing strip 113 is hermetically snap-connected in the gap formed by the first front side carrier 111 and the first rear side carrier 112 to improve the sealing performance of the first wheel carrier 11 and provide a good use environment for the first bearing 13. The cross-sectional shape of the first sealing strip 113 can be diversified. In this embodiment, it is specifically shown as a sealing strip with a T-shaped cross-section. The "-" of the T is simultaneously snap-connected to the inner side walls of the first front side carrier 111 and the second front side carrier 311, and the "|" of the T passes through the above gap and extends outside the first installation cavity 17. Thus, the first sealing strip 113 not only has a good sealing effect but can also be used as a decorative strip to increase the aesthetic degree.

[0043] Optionally, the driving wheel 12 in this embodiment is a rear wheel, and specifically includes a first wheel rim 121, a first base 122, and a first tread 123. Among them, the first wheel rim 121 includes two axially spaced first ring plates 1211 and a first connecting plate 1212 connecting the two first ring plates 1211, so that its cross-section in the radial direction is in the shape of "I", providing a stable basic support for the driving wheel 12. Thus, a first card slot 1213 for the first base 122 to be snapped into is formed on the outer ring wall of the first wheel rim 121. In order to further increase the connection stability between the first wheel rim 121 and the first base 122, the two can be connected and consolidated with fasteners such as bolts. The first tread 123 is connected to the side of the first base 122 away from the first wheel rim 121 and extends outside the first card slot 1213 for contacting the ground. The internal gear ring 14 and the first bearing 13 are both installed on the inner ring wall of the first wheel rim 121. Among them, the two first ring plates 1211 clamp the two first bearings 13, thereby realizing the axial limit of the two first bearings 13 and further increasing the stability of the first bearing 13.

[0044] Optionally, combining Figure 2 and Figure 3The drive mechanism 15 also includes a driving shaft 152, a driven shaft 153, planetary gears 154, a chainring 155, a flywheel 156, and a transmission belt 157. The driving shaft 152 and the driven shaft 153 are installed on the first wheel frame 11 at intervals, with their axes parallel to each other and passing through the first front side frame 111 and the first rear side frame 112 at the same time. Among them, the driving shaft 152 is located on the outer ring side of the driving wheel 12, and the driven shaft 153 is located on the inner ring side of the driving wheel 12. This not only better realizes the drive, but also improves the space utilization and reduces the volume of the drive structure 1. The planetary gears 154 and the chainring 155 are fixedly mounted on the driving shaft 152, so that the planetary gears 154 drive the chainring 155 to rotate synchronously, which can improve the rotational stability of the chainring 155. The flywheel 156 and the gear plate 151 are fixedly mounted on the driven shaft 153. A transmission belt 157 is connected between the chainring 155 and the flywheel 156. The transmission belt 157 can be a chain or a synchronous belt. The chainring 155 can synchronously drive the flywheel 156 to rotate through the transmission belt 157. The flywheel 156 then drives the gear plate 151 to rotate, thereby realizing gear transmission between the gear plate 151 and the inner ring gear 14. The above-mentioned drive mechanism 15 has high transmission efficiency and simple structure, further improving the assembly efficiency of the drive structure 1 while maintaining effective transmission.

[0045] In the driving structure 1 of this embodiment, two large bearings are used to replace the design of "conventionally using multiple bearings whose rotation direction is consistent with the direction of friction force and multiple bearings whose rotation direction is perpendicular to the direction of friction force", so as to reduce the total number of bearings set, while ensuring the smooth rotation of the driving wheel 12. During assembly, the two first bearings 13 can be installed on the driving wheel 12 in one step. It is best to dock and fix the first front side frame 111 and the first rear side frame 112 in the first wheel frame 11, which has high assembly efficiency.

[0046] Example 2

[0047] The second embodiment of the present invention provides a hubless bicycle, Figure 5 、 Figure 6 and Figure 7 , comprising a bicycle frame 2, a driving structure 1 as described in the first embodiment, and a driven structure 3. The driving structure 1 can be rear-wheel drive or front-wheel drive, that is, the driving wheel 12 in the driving structure 1 can be a rear wheel or a front wheel, which can be adjusted according to the design requirements of the bicycle. This embodiment specifically takes rear-wheel drive as an example.

[0048] In this embodiment, based on the drive structure 1 of the first embodiment, a battery 4, a control panel 5, and a motor 6 are further provided on the frame 2. The battery 4 is connected to the control panel 5 and the motor 6, respectively. The motor 6 is located on one side of the drive structure 1 and is drivingly connected to the drive mechanism 15. As a result, the bicycle of this embodiment can be electrically driven, effectively reducing the riding burden of the user.

[0049] The frame 2 of this embodiment further preferably includes a skeleton 21, a front frame body 22, and a rear frame body 23. The front frame body 22 and the rear frame body 23 are mutually engaged, and the skeleton 21 is installed in the cavity formed after the front frame body 22 and the rear frame body 23 are connected. This allows the frame 2 to be disassembled and assembled, and at the same time facilitates the installation of the battery 4, the control panel 5, and the motor 6. The battery 4 is installed on the front side of the skeleton 21, and is then protected by the front side frame to prevent the battery 4 from being damaged by the external environment. The control panel 5 is installed on the top of the skeleton 21 to facilitate the user to operate it in time. The motor 6 is installed on the front frame body 22 and is located in front of the drive mechanism 15. The output shaft of the motor 6 is connected to the driving shaft 152 of the drive mechanism 15. The operation of the motor 6 drives the driving shaft 152 to rotate, thereby realizing electric drive.

[0050] Similarly, in order to improve the assembly efficiency of the driven structure 3, Figure 8 、 Figure 9 and Figure 10 The driven structure 3 of this embodiment specifically includes a second wheel carrier 31, a driven wheel 32, and a second bearing 33. The inner ring of the second bearing 33 is connected to the second wheel carrier 31, and the outer ring of the second bearing 33 is connected to the driven wheel 32. Because the driven structure 3 does not require a drive, it only requires a single large gear to achieve relative rotation between the second wheel carrier 31 and the driven wheel 32.

[0051] Optionally, the second wheel frame 31 includes a second front side frame 311 and a second rear side frame 312 that are docked with each other, and the docking method is the same as that of the first wheel frame 11. After the second front side frame 311 and the second rear side frame 312 are docked, a second installation cavity 34 is formed. The inner ring of the driven wheel 32 and the second bearing 33 are both located in the second installation cavity 34, which not only facilitates the installation of the driven wheel 32 and the second bearing 33 and the subsequent maintenance and replacement, but also helps to further improve the structural stability of the driven wheel 32, the second bearing 33 and the second wheel frame 31 after assembly.

[0052] Optionally, the second wheel frame 31 further includes a second sealing strip 313, which is sealingly engaged in the gap formed between the second front side frame 311 and the second rear side frame 312. The cross-sectional structure of the second sealing strip 313 is identical to that of the first sealing strip 113 and will not be further elaborated upon here. The difference is that in this embodiment, the second sealing strip 313 is a complete annular structure. This is because no other drive mechanism 15 is connected to the driven structure 3, so its annular structure can be retained, providing a better sealing effect. It can also be used as a decorative strip to enhance the aesthetics.

[0053] Optionally, the driven wheel 32 in this embodiment is a front wheel, specifically comprising a second wheel frame 321, a second base 322, and a second carcass 323. The second wheel frame 321 includes two axially spaced second ring plates 3211 and a second connecting plate 3212 connected to the two second ring plates 3211, so that its radial cross-section is also in the shape of an "I" character, providing a stable foundation support for the driven wheel 32. Thus, the second wheel frame 321 is formed with a second retaining groove 3213 on its outer annular wall for the second base 322 to snap into. To further increase the stability of the connection between the second wheel frame 321 and the second base 322, the two can also be connected and reinforced using fasteners such as bolts. The second carcass 323 is connected to the side of the second base 322 away from the second wheel frame 321 and extends out of the second retaining groove 3213 for contact with the ground. The second bearing 33 is mounted on the inner ring wall of the second wheel frame 321 , and the two second ring plates 3211 respectively abut against the outer ring of the second bearing 33 to limit the axial position of the second bearing 33 .

[0054] In addition to the beneficial effects of the first embodiment, the hubless bicycle of this embodiment is designed with an electric drive and a driven structure 3 with a single large bearing design, which is more optimized from the perspective of users and production assembly. It not only helps to increase the production capacity of hubless bicycles, but also opens up more market applications.

[0055] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A driving structure, characterized in that: The invention comprises a first wheel frame (11), a driving wheel (12), a first bearing (13), an inner gear ring (14) and a driving mechanism (15), wherein at least two first bearings (13) are axially spaced apart on the inner ring wall of the driving wheel (12), the inner ring of the first bearing (13) is connected to the first wheel frame (11), the outer ring of the first bearing (13) is connected to the driving wheel (12), and an annular groove (16) for embedding the inner gear ring (14) is formed between every two adjacent first bearings (13), and the driving mechanism (15) comprises a gear plate (151), the gear plate (151) is rotatably mounted on the first wheel frame (11) and meshes with the inner gear ring (14) to drive the driving wheel (12) to rotate.

2. The driving structure according to claim 1, characterized in that: The first wheel frame (11) includes a first front side frame (111) and a first rear side frame (112) that are connected to each other. After the first front side frame (111) and the first rear side frame (112) are connected to each other, a first installation cavity (17) is formed. The inner ring of the driving wheel (12) and the first bearing (13) are both located in the first installation cavity (17).

3. The driving structure according to claim 2, characterized in that: The first wheel frame (11) further comprises a first sealing strip (113), wherein the first sealing strip (113) is sealingly clamped in a gap formed by the first front side frame (111) and the first rear side frame (112).

4. The driving structure according to claim 1, characterized in that: The driving wheel (12) comprises a first wheel frame (121), a first base (122) and a first carcass (123); a first slot (1213) for the first base (122) to be inserted into the outer ring wall of the first wheel frame (121); the first carcass (123) is connected to a side of the first base (122) away from the first wheel frame (121); and the inner gear ring (14) and the first bearing (13) are both mounted on the inner ring wall of the first wheel frame (121).

5. The driving structure according to claim 1, characterized in that: The driving mechanism (15) further comprises a driving shaft (152), a driven shaft (153), a planetary gear (154), a toothed disc (155), a flywheel (156) and a transmission belt (157); the driving shaft (152) and the driven shaft (153) are installed on the first wheel frame (11) at intervals; the planetary gear (154) and the toothed disc (155) are fixedly sleeved on the driving shaft (152); the flywheel (156) and the gear disc (151) are fixedly sleeved on the driven shaft (153); and the transmission belt (157) is transmission-connected between the toothed disc (155) and the flywheel (156).

6. A hubless bicycle, characterized in that: It comprises a vehicle frame (2), a driving structure (1) as claimed in any one of claims 1 to 5, and a driven structure (3).

7. The hubless bicycle according to claim 6, characterized in that: The vehicle frame (2) is provided with a battery (4), a control panel (5) and a motor (6); the battery (4) is connected to the control panel (5) and the motor (6) respectively; the motor (6) is located on one side of the driving structure (1) and is drivingly connected to the driving mechanism (15).

8. The hubless bicycle according to claim 6, wherein: The driven structure (3) comprises a second wheel frame (31), a driven wheel (32) and a second bearing (33), wherein the inner ring of the second bearing (33) is connected to the second wheel frame (31), and the outer ring of the second bearing (33) is connected to the driven wheel (32).

9. The hubless bicycle according to claim 8, characterized in that: The second wheel frame (31) includes a second front side frame (311) and a second rear side frame (312) that are docked with each other. After the second front side frame (311) and the second rear side frame (312) are docked, a second installation cavity (34) is formed. The inner ring of the driven wheel (32) and the second bearing (33) are both located in the second installation cavity (34).

10. The hubless bicycle according to claim 9, wherein: The second wheel frame (31) further includes a second sealing strip (313), and the second sealing strip (313) is sealed and clamped in a gap formed by the second front side frame (311) and the second rear side frame (312).

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