CN109733516B

CN109733516B - Bicycle with wheel

Info

Publication number: CN109733516B
Application number: CN201910066612.3A
Authority: CN
Inventors: 战华锋
Original assignee: Goodbaby Child Products Co Ltd
Current assignee: Goodbaby Child Products Co Ltd
Priority date: 2019-01-24
Filing date: 2019-01-24
Publication date: 2024-04-05
Anticipated expiration: 2039-01-24
Also published as: CN109733516A

Abstract

The invention discloses a bicycle, which comprises a front frame, a main frame, a seat, a rear wheel and a transmission device, wherein the front frame is provided with a front wheel at the bottom, the front part of the main frame is connected to the front frame in a relatively rotating way, the seat is arranged on the main frame, the rear wheel is rotationally arranged at the rear part of the main frame around a rear wheel shaft, the transmission device is detachably arranged on the main frame and comprises a pedal, and a transmission assembly capable of driving the rear wheel to rotate through the pedal, the transmission device is detachably connected with the main frame and the rear wheel shaft respectively, and at least one of the transmission device and the main frame and the transmission device and the rear wheel shaft is detachably connected through a locking device of the transmission device. The whole disassembly or assembly process of the transmission device is very simple and convenient, so that the bicycle can be conveniently converted between a bicycle state and a loading assisting state.

Description

Bicycle with wheel

Technical Field

The invention relates to a bicycle, in particular to a bicycle with a detachable transmission device.

Background

In order to expand the use functions of bicycles, the prior art also has a precedent of removing pedals of the bicycle, thereby using the bicycle as a walker or a child product converted into other functions. For example, chinese patent CN201380041749.4 discloses a bicycle which can be converted into a toy horse, and the bicycle is further converted into a toy horse by removing the transmission system on the bicycle. However, in the disassembled state, the dental tray and the connecting members in the transmission mechanism are disassembled, and the rear driving wheel of the dental tray is still connected with the frame, so that the complete disassembly of the whole transmission system cannot be realized. In the prior art, the transmission system of some bicycles needs to be installed on the bicycle by means of external connecting fittings such as screws, and the transmission system is easy to lose after being disassembled, so that the transmission system is inconvenient to store after being disassembled and reinstall for the next use.

Disclosure of Invention

The invention aims to provide a bicycle, a transmission device of which can be conveniently and integrally detached.

In order to achieve the above purpose, the invention adopts the following technical scheme: the bicycle comprises a front frame, a main frame, a seat, a rear wheel and a transmission device, wherein the front frame is provided with a front wheel at the bottom, the front part of the front frame is connected with the front frame in a relatively rotating manner, the seat is arranged on the main frame, the rear wheel is rotationally arranged at the rear part of the main frame around a rear wheel shaft, the transmission device is detachably arranged on the main frame and comprises a pedal, a transmission assembly capable of driving the rear wheel to rotate through the pedal, the transmission device is respectively connected with the main frame and the rear wheel shaft in a detachable manner, and at least one of the transmission device and the rear wheel shaft is connected with the main frame in a detachable manner through a locking device of the transmission device.

Preferably, the transmission device comprises a mounting seat detachably mounted on the main frame, a driving shaft rotatably arranged at the front part of the mounting seat around a self axis, a driven shaft rotatably arranged at the rear part of the mounting seat around the self axis, and the transmission assembly is arranged between the driving shaft and the driven shaft and used for transmitting power.

Further, the driven shaft is detachably connected with the rear wheel shaft, and the locking device is a self-locking structure arranged on the driven shaft and used for locking the driven shaft relative to the rear wheel shaft so as to enable the driven shaft and the rear wheel shaft to synchronously rotate.

Still further, the rear axle is provided with a mounting hole into which the driven axle can be inserted in the axial direction, the driven axle comprises a shaft body capable of being inserted into the mounting hole in a matched mode, the self-locking structure comprises a locking piece arranged on the shaft body, the locking piece can be arranged in a position adjustable mode along the radial direction of the shaft body, the locking piece has a locking state and an unlocking state, and when the locking piece is in the locking state, the locking piece protrudes out of the outer peripheral wall of the shaft body; when the locking member is in the unlocked state, the locking member is retracted in the shaft body.

Further, the driven shaft comprises a shaft body, the self-locking structure comprises a locking piece arranged on the shaft body, the locking piece can be adjustably arranged along the radial direction of the shaft body, the locking piece has a locking state and an unlocking state, and when the locking piece is in the locking state, the locking piece protrudes out of the outer peripheral wall of the shaft body; when the locking member is in the unlocked state, the locking member is retracted in the shaft body.

Still further, still be provided with on the rear axle and provide the spacing face of locking piece axial spacing, when the axle body inserts and establishes in the mounting hole and the locking piece is in the locking state, the locking piece is supported and is leaned on the spacing face.

Furthermore, the shaft body is provided with a shaft hole penetrating along the axial direction, the driven shaft further comprises a locking shaft which can penetrate through the shaft hole in a relatively sliding manner along the axial direction, and the locking member can be driven to switch between the locking state and the unlocking state when the locking shaft slides along the axial direction.

Further, the locking shaft is provided with a locking part and an unlocking part which are distributed in sequence along the axial direction, the outer diameter of the locking part is larger than that of the unlocking part, and when the locking part abuts against the locking piece, the locking piece is switched to the locking state; when the locking part is separated from the locking part, the locking part can retract inwards into the shaft body along the radial direction of the shaft body, and the driven shaft is further provided with an elastic part for providing elastic force required by the locking shaft to slide along the axial direction so as to keep the locking part and the locking part matched.

As a specific embodiment, the locking member is a plurality of elastic pins arranged on the shaft body, a plurality of pin grooves for installing the elastic pins are arranged on the shaft body, the pin grooves are distributed at intervals along the radial direction of the shaft body, and the pin grooves are communicated with the shaft hole.

Further, a positioning seat is relatively fixedly arranged on the rear axle, a positioning structure is arranged between the mounting seat and the positioning seat, the positioning structure comprises a plurality of groups of mutually matched positioning grooves and positioning columns, one of the positioning columns and the positioning grooves is arranged on the positioning seat, and the other positioning column is arranged on the mounting seat.

As a specific embodiment, the positioning grooves are disposed on the positioning seat, and all the positioning grooves are distributed on the positioning seat at intervals on a circumference taking the axial line of the rear axle as a rotation center.

Preferably, the front part of the mounting seat is provided with a mounting shaft sleeve which can be penetrated by the driving shaft in an axial fit way, the mounting shaft sleeve is detachably connected to the main frame through a connecting assembly, and the locking device is the connecting assembly.

Further, the coupling assembling includes a plurality of slidingly setting up the connecting piece on the installation axle sleeve, the connecting piece includes the connecting rod section and is located spacing end on the connecting rod section tip, the diameter of spacing end is greater than the diameter of connecting rod section, offer a plurality of with connecting piece matched with connecting hole on the main frame, the connecting hole including supply spacing end male insertion hole, can with connecting rod section sliding fit's locking hole, the insertion hole with the locking hole communicates each other, the coupling assembling still includes and is used for driving the connecting piece slides and makes it can the switching position's retaining member between the insertion hole with the locking hole.

Further, the main frame is provided with a cross beam extending along the front-rear direction at least, the mounting shaft sleeve is provided with a connecting block which can be matched with the cross beam, the connecting pieces are provided with two groups and are arranged on the connecting block, and the connecting block is detachably mounted at the bottom of the cross beam through the connecting pieces.

Furthermore, the pedals are respectively and fixedly connected to the two shaft ends of the driving shaft, and the pedals are respectively arranged on the left side and the right side of the cross beam.

Preferably, the transmission assembly comprises a driving sprocket arranged on the driving shaft, a driven sprocket arranged on the driven shaft, and a transmission chain tensioned between the driving sprocket and the driven sprocket, the mounting seat is at least provided with an outer cover, and the driving sprocket, the driven sprocket and the transmission chain are all accommodated in the outer cover.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the bicycle can be used as a bicycle by integrally mounting the transmission device on the main frame, and can be used as a carrier by integrally dismounting the transmission device from the main frame, and at least one of the connection between the transmission device and the main frame and the connection between the transmission device and the rear wheel axle is a detachable connection realized by utilizing the locking device of the transmission device, so that an installation accessory is not required to be additionally arranged, and the whole dismounting or installation process is very simple and convenient.

Drawings

FIG. 1 is a schematic view of the overall structure of a bicycle (with a transmission) in accordance with the present invention;

FIG. 2 is an exploded view of the bicycle of FIG. 1;

FIG. 3 is a schematic view of the overall structure of the bicycle (with the transmission removed) in accordance with the present invention;

FIG. 4 is a schematic view of the overall structure of the bicycle of FIG. 1 (with the transmission cover removed);

FIG. 5 is an exploded view of the bicycle of FIG. 4;

fig. 6 to 8 are schematic views of the overall structure of the transmission device;

FIG. 9 is a side elevational view of the bicycle of FIG. 1;

FIG. 10 is a schematic view of the cross-sectional structure taken along line A-A of FIG. 9;

FIG. 11 is an enlarged schematic view of portion B of FIG. 10;

FIG. 12 is a schematic view of the internal structure of the driven shaft in the transmission;

FIG. 13 is a schematic longitudinal cross-sectional view of the bicycle of FIG. 1, with the attachment assembly attached to the cross beam and the locking member locked;

FIG. 14 is a schematic view of the bicycle of FIG. 13 after the locking member is unlocked;

FIGS. 15 to 17 are schematic views illustrating the steps of the operation when the transmission is detached from the bicycle;

wherein: 100. a front frame; 101. a front wheel;

200. a main frame; 201. a rear wheel; 202. a seat; 203. a cross beam; 204. a rear axle; 204a, mounting holes; 204b, a limiting surface; 205. a positioning seat; 205a, positioning grooves; 206. a connection hole; 206a, an insertion hole; 206b, locking holes;

300. a transmission device; 1. a mounting base; 11. positioning columns; 12. installing a shaft sleeve; 13. a connecting block; 13a, a chute; 14. an outer cover; 2. a drive shaft; 3. a driven shaft; 31. a shaft body; 31a, shaft holes; 31b, pin slots; 32. a locking shaft; 32a, a locking part; 32b, an unlocking part; 33. a locking element (spring pin); 34. an elastic member (spring); 4. A drive sprocket; 5. a driven sprocket; 6. a drive chain; 7. a connecting piece; 7a, a connecting rod section; 7b, limiting ends; 8. a locking member; 9. and (5) pedaling.

Detailed Description

The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments.

Referring to fig. 1 to 17, a bicycle includes a front frame 100 having a front wheel 101 at a bottom thereof, a main frame 200 having a front portion rotatably coupled to the front frame 100, a seat 202 provided on the main frame 200, and a rear wheel 201 rotatably provided at a rear portion of the main frame 200 about a rear wheel axle 204.

The bicycle further comprises a transmission 300 detachably mounted on the main frame 200, the transmission 300 comprising a pedal 9 and a transmission assembly capable of driving the rear wheel 201 to rotate by means of the pedal 9. The transmission 300 is detachably connected to the main frame 200 and the rear wheel shaft 204, respectively. The bicycle can be used as a bicycle after the transmission device 300 is installed, as shown in fig. 1, or the transmission device 300 can be detached as a whole to be used as a carrier vehicle, as shown in fig. 3. At least one of the connection between the transmission 300 and the main frame 200 and the connection between the transmission 300 and the rear axle 204 are detachable connections by the locking device of the transmission 300 itself, and in this embodiment, both of the connection are detachable connections by the locking device of the transmission 300 itself.

The transmission device 300 comprises a mounting seat 1 detachably mounted on the main frame 200, a driving shaft 2 rotatably arranged at the front part of the mounting seat 1 around the axis of the driving shaft, a driven shaft 3 rotatably arranged at the rear part of the mounting seat 1 around the axis of the driving shaft, and a transmission assembly arranged between the driving shaft 2 and the driven shaft 3 for transmitting power. Referring to fig. 4 and 5, in the present embodiment, the transmission assembly of the transmission device 300 includes a driving sprocket 4 disposed on the driving shaft 2, a driven sprocket 5 disposed on the driven shaft 3, and a transmission chain 6 stretched between the driving sprocket 4 and the driven sprocket 5, the mounting base 1 has at least a housing 14, and the driving sprocket 4, the driven sprocket 5, and the transmission chain 6 are all accommodated in the housing 14.

Referring to the drawings, in this bicycle, the connection between the transmission 300 and the rear axle 204 is a detachable connection by means of the locking device of the transmission 300 itself. Specifically, the driven shaft 3 is detachably connected with the rear axle 204, and the driven shaft 3 is provided with a self-locking structure for locking the driven shaft 3 relative to the rear axle 204 so as to enable the driven shaft to synchronously rotate with the rear axle 204, and the self-locking structure forms a locking device between the transmission device 300 and the rear axle 204.

Referring to the drawings, the rear axle 204 has a mounting hole 204a into which the driven shaft 3 can be inserted in the axial direction, and a self-locking structure on the driven shaft 3 is used to lock it in the mounting hole 204 a. Referring to fig. 4 to 12, the driven shaft 3 includes a shaft body 31, the self-locking structure includes a locking member 33 provided on the shaft body 31, the locking member 33 being capable of being provided on the shaft body 31 in a position-adjustable manner in a radial direction of the shaft body 31, the locking member 33 having a locked state and an unlocked state, the locking member 33 protruding from an outer peripheral wall of the shaft body 31 when the locking member 33 is in the locked state so that the driven shaft 3 cannot be pulled out from the mounting hole 204a when inserted in the mounting hole 204 a; when the lock member 33 is in the unlocked state, the lock member 33 is retracted in the shaft body 31 so that the driven shaft 3 as a whole can be pulled out from the mounting hole 204 a. The rear axle 204 is further provided with a limiting surface 204b for axially limiting the locking member 33, and when the axle body 31 is inserted into the mounting hole 204a and the locking member 33 is in a locked state, the locking member 33 abuts against the limiting surface 204b, so that the locking member cannot be removed from the mounting hole 204 a.

Referring to fig. 11 and 12, the shaft body 31 is provided with a shaft hole 31a penetrating in the axial direction, and the driven shaft 3 further includes a locking shaft 32 penetrating in the shaft hole 31a in a relatively sliding manner in the axial direction, and the locking member 33 can be driven to switch between a locked state and an unlocked state when the locking shaft 32 slides in the axial direction. Specifically, the locking shaft 32 has a locking portion 32a and an unlocking portion 32b sequentially distributed in the axial direction, the outer diameter of the locking portion 32a is larger than that of the unlocking portion 32b, and when the locking portion 32a abuts against the locking piece 33, the locking piece 33 is pushed out in the radial direction to be converted into a locking state; when the locking portion 32a is disengaged from the locking piece 33, the position of the unlocking portion 32b corresponds to the locking piece 33, and the locking piece 33 can be retracted inward into the shaft body 31 in the radial direction of the shaft body 31. The driven shaft 3 is further provided with an elastic member 34, and the elastic member 34 is used to provide an elastic force required for the locking shaft 32 to slide in the axial direction so that the locking portion 32a is kept engaged with the locking member 33, and here, the elastic member 34 is a spring.

Referring to fig. 11 and 12, in the present embodiment, the locking member 33 is a plurality of pins 33 provided on the shaft body 31, a plurality of pin grooves 32b for mounting the pins 33 are provided on the shaft body 31, the plurality of pin grooves 32b are spaced apart in the radial direction of the shaft body 31, and the pin grooves 32b are communicated with the shaft hole 32 a. Here, the number of the spring pins 33 is two, and the spring pins are arranged at intervals of 180 °.

Referring to fig. 5, 6 and 8, a positioning seat 205 is fixedly arranged on the rear axle 204, a positioning structure is arranged between the mounting seat 1 and the positioning seat 205, the positioning structure comprises a plurality of groups of positioning grooves 205a arranged on the positioning seat 205 and a plurality of positioning columns 11 arranged on the mounting seat 1, all the positioning grooves 205a are distributed on the positioning seat 205 at intervals on the circumference of the axis of the rear axle 204 serving as a rotation center line, and correspondingly, the positioning columns 11 are also distributed at intervals along the circumferential direction. Of course, in some other modes, the positioning groove 205a may be formed in the mounting base 1 and the positioning post 11 may be provided on the positioning base 205.

In this way, the driven shaft 3 and the rear wheel shaft 204 can be attached and detached as follows: during installation, the locking shaft 32 is pushed inwards firstly, the locking part 32a is separated from the spring pin 33, then the driven shaft 3 is integrally inserted into the rear axle 204 along the axial direction, the positioning columns 11 and the positioning grooves 205a are aligned one by one until the spring pin 33 reaches the limiting surface 204b, then the locking shaft 32 is released, the locking shaft 32 slides under the acting force of the spring 34, so that the locking part 32a is abutted against the spring pin 33, the spring pin 33 is kept in a locking state, the installation of the driven shaft 3 and the rear axle 204 is realized, and the driven shaft 3 can drive the rear axle 204 to synchronously rotate. When the driven shaft 3 is disassembled, the operator only needs to push the locking shaft 32 inwards to overcome the acting force of the spring 34 so that the locking part 32a is separated from the spring pin 33, and then the driven shaft 3 is pulled out, and the spring pin 33 automatically retracts into the shaft body 31 under the extrusion action of the inner wall of the mounting hole 204a to realize unlocking, so that the driven shaft 3 can be integrally separated from the mounting hole 204 a.

Referring to the drawings, in the bicycle, the connection between the transmission 300 and the main frame 200 is also a detachable connection by means of the locking device of the transmission 300 itself. Referring to fig. 6 to 8, and 13 to 17, the front portion of the mount 1 has a mount boss 12 through which the drive shaft 2 is axially fitted, and the mount boss 12 is detachably connected to the main frame 200 by a connection assembly. The connection assembly constitutes a locking means between the transmission 300 and the main frame 200.

Specifically, the main frame 200 is provided with a cross beam 203, the installation shaft sleeve 12 is detachably connected to the bottom of the cross beam 203 through the connection assembly, the installation shaft sleeve 12 is further provided with a connection block 13 which can be matched with the cross beam 203, and the connection block 13 and the cross beam 203 can be closely attached and installed. Pedals 9 are fixedly connected to the two shaft ends of the driving shaft 2, and the pedals 9 are respectively arranged on the left side and the right side of the cross beam 203.

Referring to fig. 6, 8 and 13 to 17, the connection assembly includes a plurality of connection members 7 slidably disposed on a connection block 13, and a slide groove 13a for slidably guiding the connection members 7 is provided on the connection block 13, and the connection members 7 include a connection rod section 7a and a limit tip 7b disposed on an end of the connection rod section 7a, and the diameter of the limit tip 7b is larger than that of the connection rod section 7 a. The cross member 203 of the main frame 200 is provided with a plurality of connecting holes 206 matched with the connecting pieces 7, the connecting holes 206 comprise mutually communicated insertion holes 206a and locking holes 206b, wherein the insertion holes 206a can be correspondingly matched for insertion of the limiting ends 7b, and the locking holes 206b can be matched for sliding insertion of the connecting rod sections 7 a. In this way, during connection, the connecting piece 7 is inserted from the insertion hole 206a, and then the connecting piece 7 is driven to slide so as to reach the locking hole 206b, so that the limiting end 7b is limited, and the connection between the connecting piece 7 and the connecting block 13 is realized.

The connecting assembly further comprises a locking member 8 for driving the connecting member 7 to slide so as to enable the connecting member 7 to switch positions between the insertion hole 206a and the locking hole 206b, wherein the locking member 8 is rotatably arranged on the connecting block 13 and is connected with the connecting member 7 in a matched manner by adopting a cam surface, so that the connecting member 7 can be driven to slide along the sliding groove 13a when the locking member 8 is rotated, and quick-dismantling connection with the cross beam 203 is realized. In this embodiment, the two sets of connecting members 7 are provided, and when the two sets of connecting members 7 are connected or detached, the sliding directions of the two sets of connecting members are opposite, so that the two sets of connecting members are in tight fit connection with the cross beam 203.

In this way, the front portion of the mount 1 and the main frame 200 can be attached and detached as follows: referring to fig. 13 and 14, during installation, the connecting block 13 is placed under the cross beam 203, two connecting pieces 7 are correspondingly inserted into two connecting holes 206 of the cross beam 203, and then the two locking pieces 8 are rotated, so that the connecting pieces 7 gradually slide from the inserting holes 206a to the locking holes 206b, and the axial limit of the limit end 7b is realized, so that the installation between the front part of the installation seat 1 and the main frame 200 is completed; when the connector 7 is detached, the locking member 8 is rotated, and after the connector 7 slides into the insertion hole 206a from the locking hole 206b, the front whole of the mounting base 2 is pulled out downward relative to the cross member 203, so that the connector 7 is completely detached from the connection hole 206.

Thus, when the transmission device 300 is required to be mounted on the main frame 200 and used as a bicycle, the driven shaft 3 is only required to be inserted into the mounting hole 204a of the rear wheel axle 204, then the connecting block 13 in front of the mounting seat 1 is arranged below the cross beam 203 and the connecting piece 7 is correspondingly inserted into the connecting hole 206, and then the two locking pieces 8 are rotated, so that the fixed connection between the transmission device 300 and the main frame 200 can be realized, and the driven shaft 3 can be driven to drive the rear wheel axle 204 to synchronously rotate when a user steps on the pedal 9. When the transmission 300 needs to be disassembled for use as a carrier vehicle, the front locking member 8 is operated to disconnect the connecting assembly from the cross beam 203 and the mounting seat 1, and then the locking shaft 32 is pushed inwards to pull out the driven shaft 3 integrally, so that the integral disassembly of the transmission 300 can be completed. The above-mentioned installation process and the above-mentioned dismantlement process are all realized without the help of the installation connecting component outside the transmission 300, and the operation is very simple and convenient, has expanded the function of using of bicycle effectively.

The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims

1. The utility model provides a bicycle, includes that the bottom is equipped with the front frame of front wheel, front portion relatively rotationally connect main frame on the front frame, set up seat on the main frame, and locate around the rear axle rotationally the rear wheel at main frame rear portion, its characterized in that: the bicycle also comprises a transmission device which is detachably arranged on the main frame, the transmission device comprises a pedal and a transmission component which can drive the rear wheel to rotate through the pedal, the transmission device is respectively detachably connected with the main frame and the rear wheel shaft, wherein the transmission device comprises a mounting seat which is detachably arranged on the main frame, a driving shaft which can be rotatably arranged in front of the mounting seat around a self axis, a driven shaft which can be rotatably arranged at the rear of the mounting seat around the self axis, the transmission component is arranged between the driving shaft and the driven shaft and is used for transmitting power,

the front part of the mounting seat is provided with a mounting shaft sleeve which can be used for the driving shaft to pass through in an axial fit manner, the mounting shaft sleeve is detachably connected to the main frame through a connecting component, so that the transmission device is detachably connected with the main frame, the connecting component comprises a plurality of connecting pieces which are slidably arranged on the mounting shaft sleeve, the connecting pieces comprise connecting rod sections and limiting ends positioned on the end parts of the connecting rod sections, the diameter of the limiting ends is larger than that of the connecting rod sections, the main frame is provided with a plurality of connecting holes matched with the connecting pieces, the connecting holes comprise insertion holes for the insertion of the limiting ends and locking holes which can be in sliding fit with the connecting rod sections, the insertion holes are mutually communicated with the locking holes, and the connecting component further comprises locking pieces which are used for driving the connecting pieces to slide so that the connecting pieces can switch positions between the insertion holes and the locking holes;

the transmission device is detachably connected with the rear wheel axle through a self-locking structure which is arranged on the driven shaft and used for locking the driven shaft relative to the rear wheel axle so as to synchronously rotate with the rear wheel axle,

the main frame has at least along the crossbeam that the fore-and-aft direction extends, install have on the axle sleeve can with crossbeam matched with connecting block, the connecting piece has two sets of and all sets up on the connecting block, the connecting block passes through connecting piece detachably installs the bottom of crossbeam, the retaining member rotationally set up on the connecting block and with adopt cam surface cooperation ground to be connected between the connecting piece, make when rotating the retaining member alright realize with the quick detach connection of crossbeam.

2. The bicycle of claim 1, wherein: the rear axle is provided with a mounting hole for the driven axle to be inserted in the axial direction, the driven axle comprises a shaft body capable of being inserted in the mounting hole in a matched mode, the self-locking structure comprises a locking piece arranged on the shaft body, the locking piece can be arranged in a position-adjustable mode along the radial direction of the shaft body, the locking piece is provided with a locking state and an unlocking state, and when the locking piece is in the locking state, the locking piece protrudes out of the outer peripheral wall of the shaft body; when the locking member is in the unlocked state, the locking member is retracted in the shaft body.

3. The bicycle of claim 2, wherein: the rear axle is also provided with a limiting surface for axially limiting the locking piece, and when the axle body is inserted into the mounting hole and the locking piece is in a locking state, the locking piece is abutted against the limiting surface.

4. The bicycle of claim 2, wherein: the driven shaft further comprises a locking shaft which can be penetrated in the shaft hole in a relatively sliding mode along the axial direction, and the locking piece can be driven to be switched between the locking state and the unlocking state when the locking shaft slides along the axial direction.

5. The bicycle of claim 4, wherein: the locking shaft is provided with a locking part and an unlocking part which are distributed in sequence along the axial direction, the outer diameter of the locking part is larger than that of the unlocking part, and when the locking part abuts against the locking piece, the locking piece is switched to the locking state; when the locking part is separated from the locking part, the locking part can retract inwards into the shaft body along the radial direction of the shaft body, and the driven shaft is further provided with an elastic part for providing elastic force required by the locking shaft to slide along the axial direction so as to keep the locking part and the locking part matched.

6. The bicycle of claim 5, wherein: the locking piece is a plurality of bullet round pins that set up on the axle body, be provided with on the axle body and be used for installing a plurality of cotter grooves of bullet round pin, a plurality of the cotter groove is followed the radial interval distribution of axle body, just the cotter groove with communicate each other between the shaft hole.

7. The bicycle of any one of claims 1 to 6, wherein: the rear wheel axle is relatively fixedly provided with a positioning seat, a positioning structure is arranged between the mounting seat and the positioning seat, the positioning structure comprises a plurality of groups of positioning grooves and positioning columns which are matched with each other, one of the positioning columns and the positioning grooves is arranged on the positioning seat, and the other positioning column is arranged on the mounting seat.

8. The bicycle of claim 7, wherein: the locating grooves are arranged on the locating seat, and all the locating grooves are distributed on the locating seat at intervals on the circumference taking the axial lead of the rear wheel axle as the rotation center.

9. The bicycle of claim 1, wherein: the pedals are respectively and fixedly connected to the two shaft ends of the driving shaft, and are respectively arranged on the left side and the right side of the cross beam.

10. The bicycle of claim 1, wherein: the transmission assembly comprises a driving sprocket arranged on the driving shaft, a driven sprocket arranged on the driven shaft and a transmission chain tensioned between the driving sprocket and the driven sprocket, the mounting seat is at least provided with an outer cover, and the driving sprocket, the driven sprocket and the transmission chain are all accommodated in the outer cover.