Lithium electric vehicle

Abstract

The lithium electric vehicle comprises a vehicle frame, a saddle assembly is arranged at the top end of the vehicle frame, a middle shaft is arranged on the vehicle frame in a penetrating mode, cranks are arranged on the two sides of the middle shaft, the two cranks are sleeved with rotating sleeve rods correspondingly, the two rotating sleeve rods are connected with a rear wheel assembly, one end of the vehicle frame is connected with a front wheel assembly, and the front wheel assembly is foldable. The front wheel assembly is connected with the handle assembly, the handle assembly is foldable, and the transmission assembly is arranged between the crank and the rear wheel assembly, so that a rotary folding mode is adopted, a folding point is concentric and coaxial with the center of the five-way joint, the chain center distance is always kept constant in the folding process, and the problems of chain loosening and falling caused by change of the chain center distance in a conventional design are effectively solved; a chain tensioner does not need to be additionally arranged, so that the manufacturing cost is reduced, and the conciseness of the whole vehicle structure is kept; in addition, in the inflection link, automatic fixing can be achieved through cooperation of the positioning assembly and the locking assembly, and the operation is more convenient and faster.

Description

Technical Field

[0001] This application relates to the technical field of electric vehicles, and more particularly to a lithium-ion electric vehicle. Background Technology

[0002] Lithium-ion electric vehicles are portable folding vehicles powered by lithium-ion batteries. They include pure electric vehicles and lithium-ion electric bicycles. Lithium-ion electric bicycles are two-wheeled vehicles that are based on traditional bicycles and equipped with an electric motor system powered by lithium batteries. Their core feature is the combination of human power and electric assistance.

[0003] Currently, most lithium-ion electric bicycles on the market use a folding structure design where the folding point is located behind the battery tube. In this design, the axis of the folding point is not concentric with the axis of the bottom bracket center. This structural defect directly causes irregular fluctuations in the chain center distance during folding operations, which can easily lead to chain loosening, detachment, and other malfunctions. Therefore, existing products must be equipped with an additional chain tensioner to alleviate this problem, which increases manufacturing costs and also affects the simplicity of the overall bicycle structure.

[0004] In addition, existing lithium-ion electric vehicles are not very convenient to operate when switching to riding mode: most products require users to manually tighten bolts (some require tools) to fix the folding frame, which is cumbersome and time-consuming. Application content

[0005] This application aims to at least partially address one of the technical problems in the related art.

[0006] Therefore, the purpose of this application is to propose a lithium-ion electric vehicle that adopts a rotational folding method, with the folding point and the center of the bottom bracket being concentric and coaxial. This ensures that the chain center distance remains constant during the folding process, effectively avoiding the chain loosening and falling off problems caused by changes in the chain center distance in conventional designs. It eliminates the need for additional chain tensioners, reduces manufacturing costs, and maintains the simplicity of the overall vehicle structure. Furthermore, the folding process can be automatically fixed through the cooperation of positioning and locking components, making it more convenient.

[0007] To achieve the above objectives, this application proposes a lithium-ion electric vehicle, including a frame, a seat assembly at the top of the frame, a central axle passing through the frame, cranks on both sides of the central axle, rotating sleeves sleeved on the two cranks, a rear wheel assembly connected to the two rotating sleeves, a front wheel assembly connected to one end of the frame, the front wheel assembly being foldable, a handlebar assembly connected to the front wheel assembly being foldable, a transmission assembly between the cranks and the rear wheel assembly, a positioning assembly on one side of the rear wheel assembly, and a locking assembly on one side of the frame, the positioning assembly being inserted into the locking assembly.

[0008] This application discloses a lithium-ion electric vehicle that employs a rotary folding mechanism. The folding point is concentric and coaxial with the center of the bottom bracket, ensuring that the chain center distance remains constant during folding. This effectively avoids the chain loosening and detachment problems caused by changes in the chain center distance in conventional designs. It eliminates the need for an additional chain tensioner, reducing manufacturing costs and maintaining the simplicity of the overall vehicle structure. Furthermore, the folding process can be automatically fixed through the cooperation of positioning and locking components, making it more convenient.

[0009] In addition, the application may also include the following additional technical features: Specifically, the rear wheel assembly includes a folding frame, a rear wheel, two first rollers and two second rollers. The folding frame is connected to the two rotating sleeves respectively, the rear wheel is rotatably connected to the folding frame, and the two first rollers and the two second rollers are rotatably connected to the folding frame respectively.

[0010] Specifically, the front wheel assembly includes a front fork, a front wheel, and a first folding device, wherein the axle of the front wheel is rotatably connected to the front fork, and the first folding device is disposed between the front fork and the frame.

[0011] Specifically, the handlebar assembly includes a seat tube, a second folding mechanism, and a handlebar, wherein the second folding mechanism is disposed between the bottom end of the fork and the seat tube, and the handlebar is connected to the top end of the seat tube.

[0012] Specifically, the transmission assembly includes a chainring, a freewheel, a chain, and a derailleur. The chainring is mounted on the crank, the freewheel is mounted on the outside of the rear wheel axle, the chainring and the freewheel are connected by the chain drive, and the derailleur is mounted on the folding frame and cooperates with the chain.

[0013] Specifically, the positioning assembly includes a shock absorber, a top seat, and two positioning posts. The shock absorber is connected to the folding frame, the top seat is located on one side of the shock absorber, and the two positioning posts are respectively connected to the top seat.

[0014] Specifically, the locking assembly includes a locking groove, a ball pin, a rotating plate, a ramp, and a wire controller. The locking groove is connected to the frame, the top seat is inserted into the locking groove, the ball pin passes through the top wall of the locking groove and is inserted into the top seat, the rotating plate is sleeved on the ball pin, the ramp is connected to the rotating plate and abuts against the top end of the ball pin, and the wire controller is connected to the rotating plate.

[0015] Specifically, the seat assembly includes a seat tube, a seat, and a seat tube clamp. The frame is fitted over the outside of the seat tube, the seat is connected to the seat tube, and the seat tube clamp is disposed on the outside of the frame and the seat tube.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a first three-dimensional structural schematic diagram of the present application; Figure 2 This is a schematic diagram of the second three-dimensional structure of this application; Figure 3 This is a schematic diagram of the first folded state of this application; Figure 4 This is a side view of the folded state of this application; Figure 5 This is an enlarged schematic diagram of area A in this application; Figure 6 This is a schematic diagram of the second folded state of this application; Figure 7 This is an enlarged schematic diagram of area B in this application.

[0018] As shown in the figure: 10. Frame; 11. Seat assembly; 111. Seatpost; 112. Seat; 113. Seatpost clamp; 21. Bottom bracket; 22. Crank; 23. Rotary lever; 30. Rear wheel assembly; 31. Folding frame; 32. Rear wheel; 33. First roller; 34. Second roller; 40. Front wheel assembly; 41. Front fork; 42. Front wheel; 43. First folding mechanism; 50. Handlebar assembly; 51. Stem tube; 52. Second folding mechanism; 53. Handlebar; 60. Drivetrain assembly; 61. Crankset; 62. Freewheel; 63. Chain; 64. Derailleur; 70. Positioning assembly; 71. Shock absorber; 72. Top mount; 73. Positioning post; 80. Locking assembly; 81. Locking slot; 82. Ball pin; 83. Rotary plate; 84. Slope; 85. Remote control; 90. Disc brake. Detailed Implementation

[0019] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation structure and operation. Therefore, they should not be construed as limitations on this application.

[0020] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "provided with," "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] The present application will now be described in further detail with reference to the accompanying drawings.

[0022] like Figures 1-7 As shown in the figure, a lithium-ion electric vehicle according to an embodiment of this application includes a frame 10, a seat assembly 11 is provided at the top of the frame 10, a central shaft 21 is provided through the frame 10, cranks 22 are provided on both sides of the central shaft 21, rotating sleeves 23 are respectively sleeved on the two cranks 22, and the two rotating sleeves 23 are connected to a rear wheel assembly 30. A front wheel assembly 40 is connected to one end of the frame 10. The front wheel assembly 40 is foldable and a handlebar assembly 50 is connected to the front wheel assembly 40. The handlebar assembly 50 is foldable. A transmission assembly 60 is provided between the cranks 20 and the rear wheel assembly 30. A positioning assembly 70 is provided on one side of the rear wheel assembly 30, and a locking assembly 80 is provided on one side of the frame 10. The positioning assembly 70 and the locking assembly 80 are inserted into each other.

[0023] It should be noted that the frame 10 has a through hole for the central axle 21 to pass through. A bearing is installed between the central axle 21 and the through hole of the frame 10 to reduce friction and improve rotational stability. The central axle 21 is a bottom bracket center, and the end of the rotating sleeve 23 has a sleeve hole, with the crank 22 abutting against the sleeve hole of the rotating sleeve 23. The seat assembly 11 has a reserved mounting chamber for a built-in lithium battery to provide power.

[0024] Both cranks 22 are connected to pedals on their outer sides. The pedals have anti-slip textures to increase the friction between the foot and the pedals and prevent slipping while riding.

[0025] Specifically, in actual operation, the user sits on the seat assembly 11 and pedals on both sides. The crank 22 rotates around the central shaft 21, and the power is transmitted to the transmission assembly 60. The transmission assembly 60 converts the rotational power of the crank 22 into the driving power of the rear wheel assembly 30, which drives the rear wheel 32 to rotate. With the assistance of the lithium battery, the lithium electric vehicle moves forward. Steering is achieved through the handlebar assembly 50. When the user turns the handlebar assembly 50, its power is transmitted to the front fork 41 of the front wheel assembly 40. The front fork 41 drives the front wheel 42 to rotate synchronously, thereby changing the direction of travel of the lithium electric vehicle.

[0026] When folding for storage, first fold the front wheel assembly 40 close to the frame 10, then fold the handlebar assembly 50 close to the front wheel assembly 40 to reduce space occupation. Then, the user lifts the vehicle upwards using the seat assembly 11, operates the locking assembly 80 to disengage it from the positioning assembly 70, and releases the position lock on the rear wheel assembly 30. Then, rotate the rotating lever 23 to fold the rear wheel assembly 30 to the front. This lithium-ion electric vehicle uses a rotating folding method, with the folding point concentric and coaxial with the bottom bracket center. The chain center distance remains unchanged during folding, effectively avoiding the chain loosening and falling off problems caused by changes in the chain center distance in conventional designs. No additional chain tensioner is required, and the chain will not fall off during folding.

[0027] When switching to riding mode, the user lifts the vehicle upwards using the seat assembly 11, then reverses the rotation lever 23 and the rear wheel assembly 30 to their initial positions, allowing the positioning component 70 on the rear wheel assembly 30 to engage with the locking component 80 on one side of the frame 10, thus securing the rear wheel assembly 30 in riding mode. The user then folds the handlebar assembly 50 back to release its fold and restore it to its original state, and then folds the front wheel assembly 40 back to release its fold and restore the entire vehicle to its original state, making it convenient for the user to ride.

[0028] In one embodiment of this application, such as Figure 1 and Figure 3 As shown, the rear wheel assembly 30 includes a folding frame 31, a rear wheel 32, two first rollers 33 and two second rollers 34. The folding frame 31 is connected to two rotating sleeves 23 respectively. The rear wheel 32 is rotatably connected to the folding frame 31. The two first rollers 33 and the two second rollers 34 are rotatably connected to the folding frame 31 respectively.

[0029] It should be noted that the two first rollers 33 and the two second rollers 34 are respectively mounted on the front and rear ends of the folding frame 31 via bearings. During daily riding, the folding frame 31 can be used as a rear seat. In the folded state, the folding frame 31 provides support for the first rollers 33 and the second rollers 34. The first rollers 33 and the second rollers 34 are in contact with the ground, making it easy for the user to push the folded lithium-ion electric vehicle to move.

[0030] In one embodiment of this application, such as Figure 1 and Figure 4 As shown, the front wheel assembly 40 includes a front fork 41, a front wheel 42, and a first folding device 43. The axle of the front wheel 42 is rotatably connected to the front fork 41, and the first folding device 43 is disposed between the front fork 41 and the frame 10.

[0031] It should be noted that the first folding device 43 described in this embodiment is a quick-release folding device. The first folding device 43 is provided with a positioning pin and a locking wrench. When unlocking, the wrench is pulled to disengage the positioning pin from the positioning hole, and the front fork 41 can be folded around the connection point, so that the front wheel 42 is close to the frame 10, reducing the space occupied. When it is necessary to switch to riding mode, the user folds the front fork 41 back to its original state and then locks it through the first folding device 43. The positioning pin of the first folding device 43 is inserted into the positioning hole, and after the wrench is rotated to lock, a rigid connection is formed to ensure the structural stability when turning.

[0032] Both the front wheel 42 and the rear wheel 32 are equipped with disc brakes 90. When riding, the user operates the brake lever on the handlebar assembly 50. The friction between the brake pads of the disc brake 90 and the brake disc (fixed on the wheel axle and rotating synchronously with the wheel) generates braking force, which quickly reduces the wheel speed and achieves smooth braking of the lithium electric vehicle.

[0033] In one embodiment of this application, such as Figure 2 and Figure 4 As shown, the handlebar assembly 50 includes a seat tube 51, a second folding mechanism 52, and a handlebar 53. The second folding mechanism 52 is disposed between the bottom end of the fork 41 and the seat tube 51, and the handlebar 53 is connected to the top end of the seat tube 51.

[0034] It should be noted that the second folding device 52 described in this embodiment is a quick-release folding device. After the front fork 41 is folded, the second folding device 52 is unlocked, and the user can pull the lever to fold the seat tube 51 around the connection point, bringing it closer to the front wheel 42 to further reduce the space occupied. When it is necessary to switch to riding mode, the user folds the seat tube 51 back to its original shape and then locks it using the second folding device 52. The handlebars 53 adopt a T-shaped structure, with brake levers and throttles at both ends for braking and speed adjustment. A riding instrument panel is installed in the middle of the handlebars 53, using a backlit display screen that can display information such as battery level, speed, and mileage in real time.

[0035] Specifically, a tube clamp is provided between the bottom end of the handlebar 53 and the seat tube 51. The tube clamp can fix the position of the handlebar 53, prevent the bottom end of the handlebar 53 from sliding inside the seat tube 51, ensure riding safety, and support the adjustment of the height of the handlebar 53 to adapt to different user needs.

[0036] In one embodiment of this application, such as Figure 2 As shown, the transmission assembly 60 includes a chainring 61, a freewheel 62, a chain 63, and a derailleur 64. The chainring 61 is mounted on the crank 22, the freewheel 62 is mounted on the outside of the axle of the rear wheel 32, and the chainring 61 and the freewheel 62 are connected by the chain 63. The derailleur 64 is mounted on the folding frame 31 and cooperates with the chain 63.

[0037] It should be noted that the 62 freewheel has multiple sprockets with different numbers of teeth. The user controls the rear derailleur to move the chain by shifting the chain from one sprocket to another, thereby changing the gear ratio and adjusting the speed.

[0038] When the user rides, they pedal, and the power is transmitted to the crank 22, then to the chainring 61, and then to the freewheel 62 via the chain 63. The freewheel 62 then transmits the power to the rear wheel 32, which, with the help of the lithium battery, enables forward movement. The user controls the derailleur 64 via the shift lever on the handlebar assembly 50, which allows the chain 63 to be switched to different numbers of teeth on the freewheel sprockets, changing the gear ratio to adjust the speed.

[0039] In one embodiment of this application, such as Figure 5 and Figure 6 As shown, the positioning assembly 70 includes a shock absorber 71, a top seat 72, and two positioning posts 73. The shock absorber 71 is connected to the folding frame 31, the top seat 72 is located on one side of the shock absorber 71, and the two positioning posts 73 are respectively connected to the top seat 72.

[0040] It should be noted that during daily riding, the shock absorber 71 can absorb the bumps and vibrations transmitted by the rear wheel 32, and reduce the vibration transmission to the frame 10 through hydraulic damping. When the user changes the lithium electric vehicle from the folded state to the riding state, the folding frame 31 is folded back to its original position, and then the top seat 72 is inserted into the locking slot 81.

[0041] In one embodiment of this application, such as Figure 5 and Figure 7 As shown, the locking assembly 80 includes a locking groove 81, a ball pin 82, a rotating plate 83, a ramp 84, and a remote controller 85. The locking groove 81 is connected to the frame 10, the top seat 72 is inserted into the locking groove 81, the ball pin 82 passes through the top wall of the locking groove 81 and is inserted into the top seat 72, the rotating plate 83 is sleeved on the ball pin 82, the ramp 84 is connected to the rotating plate 83 and abuts against the top of the ball pin 82, and the remote controller 85 is connected to the rotating plate 83.

[0042] It should be noted that the ball pin 82 is slidably connected to the through hole on the top wall of the locking groove 81. The top seat 72 has an insertion hole that matches the ball pin 82. Both sides of the locking groove 81 have receiving holes. When the top seat 72 is inserted into the locking groove 81, the positioning pin 73 is simultaneously embedded in the receiving hole to achieve initial positioning, providing precise guidance for subsequent locking.

[0043] The wire-controlled controller 85 has a similar structure to the gearbox and adopts a hidden design. It is integrated into the internal cavity of the frame 10. There is an adjustment switch (such as a lever or button) on the handlebar 53. The adjustment switch can operate the wire-controlled controller 85. The wire-controlled controller 85 will pull the rotating plate 83 and the ramp 84 to rotate. Due to the height difference of the ramp surface 84, during its rotation, it will push the ball pin 82 to slide up and down along the top wall of the locking groove 81 through the contact relationship between the ramp surface and the top of the ball pin 82.

[0044] When folding is required, the user operates the adjustment switch and pulls the rotating plate 83 and the ramp 84 to rotate via the wire controller 85, so that the high end of the ramp 84 contacts the top of the ball pin 82. The ball pin 82 moves upward and disengages from the socket. Then, the vehicle is lifted upward via the seat assembly 11. Subsequently, the folding frame 31 is rotated to fold the rear wheel 32 to the front, so that the two first rollers 33 and the two second rollers 34 respectively touch the ground, making it easier for the user to push the lithium-ion electric vehicle.

[0045] When switching to riding mode, the user lifts the vehicle upwards using the handlebar assembly 50, then rotates the folding frame 31 in the opposite direction to the initial position, causing the top mount 72 to insert into the locking slot 81. Simultaneously, the positioning pins 73 on both sides are inserted into the receiving holes. By operating the adjustment switch and pulling the rotating plate 83 and the ramp 84 through the remote controller 85, the lower end of the ramp 84 contacts the top of the ball pin 82, causing the ball pin 82 to fall down and the top mount 72 to be inserted into the socket, thus completing the fixation.

[0046] In one embodiment of this application, such as Figure 2 As shown, the seat assembly 11 includes a seat tube 111, a seat 112, and a seat tube clamp 113. The frame 10 is sleeved on the outside of the seat tube 111, the seat 112 is connected to the seat tube 111, and the seat tube clamp 113 is disposed on the outside of the frame 10 and the seat tube 111.

[0047] It should be noted that the seat post 111 and the vertical tube of the frame 10 form a sliding fit. The lithium battery is located inside the seat post 111. The seat post clamp 113 can fix the position of the seat post 111 to prevent the seat post 111 from sliding or rotating inside the vertical tube of the frame 10, thus ensuring riding safety. At the same time, it supports adjusting the height of the seat post 111 to adapt to different riding postures or height requirements.

[0048] In summary, the lithium-ion electric vehicle of this application adopts a rotational folding method, with the folding point and the center of the bottom bracket being concentric and coaxial. This ensures that the chain center distance remains constant during the folding process, effectively avoiding the chain loosening and falling off problems caused by changes in the chain center distance in conventional designs. It eliminates the need for additional chain tensioners, reducing manufacturing costs and maintaining the simplicity of the overall vehicle structure. Furthermore, the folding process can be automatically fixed through the cooperation of positioning and locking components, making it more convenient.

[0049] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The present application and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present application. The actual structure is not limited to this. In conclusion, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of the present application, such design should fall within the protection scope of the present application.

Claims

1. A lithium electric vehicle comprising a vehicle frame (10) characterised in that: The top end of the frame (10) is provided with a seat assembly (11), the frame (10) is provided with a middle shaft (21), the both sides of the middle shaft (21) are provided with a crank (22), the both sides of the crank (22) are respectively provided with a rotating sleeve rod (23), the both sides of the rotating sleeve rod (23) are connected with a rear wheel assembly (30), one end of the frame (10) is connected with a front wheel assembly (40), the front wheel assembly (40) is foldable, the front wheel assembly (40) is connected with a handle assembly (50), the handle assembly (50) is foldable, the crank (20) and the rear wheel assembly (30) are provided with a transmission assembly (60), one side of the rear wheel assembly (30) is provided with a positioning assembly (70), one side of the frame (10) is provided with a locking assembly (80), the positioning assembly (70) and the locking assembly (80) are inserted.

2. A lithium electric vehicle as claimed in claim 1 wherein: The rear wheel assembly (30) comprises a folding frame (31), a rear wheel (32), two first rollers (33) and two second rollers (34), the folding frame (31) is connected with the rotating sleeve rod (23), the rear wheel (32) is rotatably connected with the folding frame (31), the both sides of the folding frame (31) are rotatably connected with the first roller (33) and the second roller (34).

3. A lithium electric vehicle as claimed in claim 1 wherein: The front wheel assembly (40) comprises a front fork (41), a front wheel (42) and a first folder (43), the axle of the front wheel (42) is rotatably connected with the front fork (41), the first folder (43) is arranged between the front fork (41) and the frame (10).

4. A lithium electric vehicle as claimed in claim 3 wherein: The handle assembly (50) comprises a vertical pipe (51), a second folder (52) and a handle (53), the second folder (52) is arranged between the front fork (41) and the bottom end of the vertical pipe (51), the handle (53) is connected with the top end of the vertical pipe (51).

5. A lithium electric vehicle as claimed in claim 2, wherein: The transmission assembly (60) comprises a sprocket (61), a freewheel (62), a chain (63) and a transmission (64), the sprocket (61) is arranged on the crank (22), the freewheel (62) is arranged on the outside of the axle of the rear wheel (32), the sprocket (61) and the freewheel (62) are drivingly connected through the chain (63), the transmission (64) is arranged on the folding frame (31) and matched with the chain (63).

6. A lithium electric vehicle as claimed in claim 2, wherein: The positioning assembly (70) comprises a shock absorber (71), a top seat (72) and two positioning columns (73), the shock absorber (71) is connected with the folding frame (31), the top seat (72) is arranged on one side of the shock absorber (71), the both sides of the top seat (72) are respectively connected with the positioning column (73).

7. A lithium electric vehicle as claimed in claim 6 wherein: The locking assembly (80) comprises a locking groove (81), a spherical bolt (82), a rotating plate (83), a slope plate (84) and a wire controller (85), the locking groove (81) is connected with the frame (10), the top base (72) is inserted with the locking groove (81), the spherical bolt (82) passes through the top wall of the locking groove (81) and is inserted with the top base (72), the rotating plate (83) is sleeved on the spherical bolt (82), the slope plate (84) is connected with the rotating plate (83), and the slope plate (84) abuts against the top end of the spherical bolt (82), and the wire controller (85) is connected with the rotating plate (83).

8. The lithium electric vehicle of claim 1, wherein: The seat assembly (11) comprises a seat tube (111), a seat (112) and a seat tube clamp (113), the frame (10) is sleeved outside the seat tube (111), the seat (112) is connected with the seat tube (111), and the seat tube clamp (113) is arranged outside the frame (10) and the seat tube (111).

Images