CN112519945A

CN112519945A - Foldable bicycle

Info

Publication number: CN112519945A
Application number: CN202011437667.XA
Authority: CN
Inventors: 毛海荣; 蔡英长
Original assignee: Zhejiang Goccia Electric Technology Co ltd
Current assignee: Zhejiang Goccia Electric Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-03-19

Abstract

The invention provides a foldable bicycle, and belongs to the technical field of bicycles. It has solved how to solve among the prior art that the bicycle after folding stands on the not enough and drags or push the problem of labouring of ground stability. The utility model provides a foldable bicycle, is used for connecting the front truck frame of front fork and the back vent that the rear end is used for installing the rear wheel including the front end, the front truck frame lower part is articulated through the articulated shaft with the back vent front end, when the back vent is relative front truck frame and rotates, can make the back end of back vent be located one side of front vent, the left and right sides of back vent all is equipped with the gyro wheel, and when the back end of back vent was located one side of front vent, two gyro wheels were located the downside of back vent, and one of them gyro wheel can be removed to the opposite side direction of front vent. This collapsible bicycle makes the bicycle after folding stand on ground more stable, and the bicycle after folding can directly roll through two gyro wheels and drag or carry out, makes the bicycle after folding drag or carry out convenient and laborsaving.

Description

Foldable bicycle

Technical Field

The invention belongs to the technical field of bicycles, and relates to a foldable bicycle.

Background

The bicycle sport not only can build up the body, but also is a green trip mode, and is loved by more and more people.

In order to make the bicycle conveniently carry and store, folding bicycle has appeared, and current common folding bicycle, bicycle overall structure are similar with ordinary bicycle, add the frame department in the middle of preceding, the rear wheel and establish folding structure and realize the front and back folding of frame.

Chinese patent literature discloses a foldable bicycle [ application No. 201120278734.8, publication No. CN202163557U ], comprising: a front frame unit including a front frame, a front wheel and a front fork, the front fork being disposed at a front end portion of the front frame, the front wheel being rotatably disposed at the front fork; the rear frame unit comprises a rear frame and a rear wheel, the rear frame unit is arranged behind the front frame unit, and the rear wheel is rotatably arranged at the rear end part of the rear frame; the frame pivot is connected with the front frame and the rear frame, so that the front frame and the rear frame are in a folding state with an inclined axis, and when the foldable bicycle is in the folding state with the inclined axis, the front wheel and the rear wheel form an outer splayed shape.

In the foldable bicycle of the above application, when the foldable bicycle is folded in a deviated axis, the front wheel and the rear wheel form an outer splayed shape, so that the front wheel and the rear wheel cannot be dragged to roll, the bicycle cover is required to wrap the periphery of the folded bicycle, then the folded bicycle is inclined by a predetermined angle, so that the projection lines of the front wheel and the rear wheel and the ground are parallel, the front wheel and the rear wheel of the folded bicycle can be dragged on the ground in a rolling manner, the front wheel and the rear wheel can be dragged smoothly only by holding the predetermined angle during dragging, but the folded bicycle cannot be always dragged or pushed smoothly during dragging after the folded bicycle is actually folded, therefore, the folded bicycle is pulled or pushed to be labored, and is erected on the ground through the front wheel, the rear wheel and the foot rest, but the support of the foot rest is only formed by one point at the bottom end, so that the support force of the point cannot be guaranteed, and the folded bicycle is stably supported on the uneven ground possibly due to insufficient support force of the point, so that the folded bicycle is easily turned on the side.

Disclosure of Invention

The invention provides a foldable bicycle aiming at the problems in the prior art, and the foldable bicycle aims to solve the technical problems that: how to solve the problem that the folded bicycle stands on the ground and has insufficient stability and is difficult to drag or push.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a foldable bicycle, is used for connecting the front truck frame of front fork and the back vent that the rear end is used for installing the rear wheel including the front end, the front truck frame lower part is articulated through the articulated shaft with the back vent front end, when the back vent is relative front truck frame and rotates, can make the back end of back vent be located one side of front vent, the left and right sides of back vent all is equipped with the gyro wheel, and when the back end of back vent was located one side of front vent, two gyro wheels were located the downside of back vent, and one of them gyro wheel can be removed to the opposite side direction of front vent.

When the bicycle is folded, the rear fork rotates around the hinge shaft, so that the rear end of the rear fork is positioned on one side of the front fork, the two rollers are positioned on the lower side of the rear fork and positioned on the left side and the right side of the rear fork, after the bicycle is folded, because the two rollers are arranged on the rear fork, the two rollers are more deviated to the position of the rear fork between the rear end of the rear fork and the front fork, in order to balance the support points of the four positions of the wheel arranged on the rear end of the rear fork and the wheel arranged on the front fork, one of the rollers moves towards the direction of the other side of the front fork, so that the roller is more deviated to the wheel arranged on the rear end of the rear fork, so that the support points of the four positions of the wheel arranged on the rear end of the rear fork and the wheel arranged on the front fork are balanced, and the support points of the four positions of the wheel arranged on the two rollers, the rear end of the rear fork and the wheel arranged on the front, the folded bicycle can be directly dragged or pushed by rolling through the two idler wheels, so that the folded bicycle is convenient and labor-saving to drag or push.

In the foldable bicycle, the rear fork is provided with the connecting sleeve, the connecting sleeve is internally inserted with the telescopic sleeve in a sliding and inserting manner, a positioning structure capable of locking the telescopic sleeve and the connecting sleeve is arranged between the telescopic sleeve and the connecting sleeve, and the two rollers are respectively connected to one end of the connecting sleeve and one end of the telescopic sleeve in a rotating manner. The telescopic sleeve is matched with the connecting sleeve to realize that one roller moves towards the other side direction of the front fork, and the positioning structure is used for locking the telescopic sleeve after the telescopic sleeve is in sliding fit with the connecting sleeve.

In the above foldable bicycle, the rear fork includes a connection fork and a rear fork integrally formed with the connection fork, the rear fork is detachably connected to the rear end of the front frame, the connection fork is rotatably connected to the hinge shaft, and the connection sleeve is connected to the rear fork. The connection fork is used for realizing that the cooperation with the articulated shaft makes the back fork rotate around the articulated shaft, can realize that the bicycle is folding, and the back end of connecting in the front frame can be dismantled to the back stay, and when making the bicycle not folding, the back stay keeps fixed connection state with preceding frame, and when the bicycle was folding, the back stay realized the bicycle is folding after breaking away from the connection with the rear end of preceding frame.

In the foldable bicycle, one inner side wall of the fork opening of the connecting fork is provided with the inner concave wall, the other inner side wall of the fork opening of the connecting fork is provided with the inner convex wall, the inner concave wall and the inner convex wall are arranged in parallel, the inner concave wall and the inner convex wall are arranged in an inclined mode towards one side direction of the front frame, the lower portion of the front frame is provided with the shaft sleeve which is arranged in an inclined mode, the shaft sleeve is arranged between the inner concave wall and the inner convex wall, the hinge shaft penetrates through the shaft sleeve, two ends of the hinge shaft are respectively connected with two sides of the connecting fork, and the connecting fork can rotate around the hinge shaft. The inner concave wall and the inner convex wall are obliquely arranged towards one side direction of the front frame, so that the shaft sleeve can be obliquely arranged between the inner concave wall and the inner convex wall, the hinged shaft is arranged in the shaft sleeve in an oblique state in a penetrating mode, and the condition that the bicycle is folded to enable the rear fork to be offset to one side of the front frame is guaranteed.

In foretell foldable bicycle, the both sides of clevis all are equipped with the screw mounting hole, and two screw mounting holes correspond with the articulated shaft both ends respectively, all have the step in two screw mounting holes, are equipped with the screw in two screw mounting holes respectively and are connected with the articulated shaft both ends, still have the connecting hole that is used for the footboard installation on the clevis. The two screw mounting holes respectively enable screws to penetrate through two ends of the hinged shaft to be respectively connected with the screws, so that the hinged shaft is hinged with the connecting fork, and the connecting holes are used for mounting the pedal.

In foretell foldable bicycle, the front truck frame includes the crossbeam, the one end of crossbeam is connected with saddle seat pipe, and the other end is connected with the head tube that is used for installing the front fork, still be connected with the pipe strap between crossbeam and the saddle seat pipe, the axle sleeve sets up the one end at the pipe strap and is located the below of crossbeam, the other end of pipe strap has the connecting seat, the connecting seat is located the rear end of front truck frame, the back is drawn the fork and can be dismantled with the connecting seat and be connected, the last mounting bracket that has of adapter sleeve, mounting bracket fixed connection is on the back is drawn the fork, when the back is drawn the fork and is linked to each other with the connecting seat, adapter sleeve is close to the junction of back and draw. When bicycle frame is not folding, back stay and connecting seat fixed connection, when bicycle frame needs to be folding, back stay breaks away from with the connecting seat and is connected, make the back stay rotate around the articulated shaft and realize folding operation, the last mounting bracket that has of connecting tube, connecting tube is close to the junction of back stay and connecting seat, makes the bicycle folding back, guarantees that connecting tube and telescopic tube are located the below of the back stay after the bicycle folding, guarantees that two gyro wheels of connection on connecting tube and telescopic tube roll on ground.

In the foldable bicycle, the mounting frame is provided with an L-shaped support, the support is connected with the connecting sleeve through two connecting plates, and the support is provided with a first screw mounting hole. Make mounting bracket integral erection on the bicycle through screw mounting hole one, it is more convenient to make adapter sleeve installation dismantle.

In the foldable bicycle, the positioning structure comprises a v-shaped elastic sheet, the v-shaped elastic sheet is arranged in the telescopic sleeve, at least one end of the v-shaped elastic sheet is provided with a first protruding column, the telescopic sleeve is provided with a through hole for the first protruding column to penetrate out, and the connecting sleeve is provided with at least two positioning holes which can enable the first protruding column to be clamped in along the length direction. The V-shaped elastic sheet can enable the first convex column to stretch and retract, and the first convex column is clamped into or separated from the positioning hole.

In foretell foldable bicycle, location structure includes cylindrical spring, cylindrical spring sets up in telescopic tube, one of cylindrical spring serves and is equipped with projection two, telescopic tube is last to be equipped with the through-hole that supplies projection two to wear out, be equipped with two at least locating holes that can make two cards of projection go into along length direction on the adapter sleeve. The at least two positioning holes are used for clamping the second protruding column to achieve positioning after telescopic adjustment of the telescopic sleeve and the connecting sleeve, and the cylindrical spring can enable the second protruding column to achieve telescopic movement to achieve clamping or separation of the second protruding column from the positioning holes.

In foretell foldable bicycle, be equipped with the guide block that is the bar along length direction in the adapter sleeve, the telescopic tube surface is equipped with the guide way with guide block matched with, the guide block is two, and two guide block centrosymmetries set up in adapter sleeve's inside, the guide way is also two, and two guide way centrosymmetries set up on telescopic tube's surface. The guide block and the guide groove are matched to enable the telescopic sleeve to stably slide along the connecting sleeve, and the guide block and the guide groove are two to enable the telescopic sleeve to slide along the connecting sleeve more stably.

Compared with the prior art, the invention has the following advantages:

the supporting points of the four positions of the wheels arranged on the rear ends of the two idler wheels and the rear fork and the four positions of the wheels arranged on the front fork make the folded bicycle stand on the ground more stably, and the folded bicycle can be directly dragged or pushed by rolling through the two idler wheels, so that the folded bicycle is convenient and labor-saving to drag or push.

Drawings

FIG. 1 is a schematic view showing an extended structure of a wheel of the foldable bicycle.

FIG. 2 is a schematic view showing a folded state of the foldable bicycle according to the present invention.

Fig. 3 is a schematic structural view of the foldable bicycle.

FIG. 4 is a cross-sectional view of two rollers, telescoping tubes, connecting tubes and locating structure.

Fig. 5 is a schematic view of the structure in which one of the two rollers is stretched.

Fig. 6 is a schematic structural view of two rollers, a telescopic tube, a connecting tube, a mounting frame and a positioning structure.

FIG. 7 is a schematic view of a roller, adapter sleeve, mounting bracket and positioning structure.

Figure 8 is a schematic view of a roller, telescoping tube and positioning structure.

Fig. 9 is a sectional view of two rollers, a telescopic tube, a coupling tube and a positioning structure in the second embodiment.

Fig. 10 is an enlarged view of a portion a of fig. 3.

Fig. 11 is a connection structure view of the front frame and the rear fork.

Fig. 12 is an enlarged view of a portion B of fig. 11.

In the drawings, 1, a front frame; 1a, a shaft sleeve; 1b, a seat tube of a vehicle seat; 1c, a front tube; 1bc, a cross beam; 1d, pipe clamp; 1d1, connecting seat; 1d11, bolt hole; 11. a front fork; 2. a rear fork; 2a, a connecting fork; 2a1, inner concave wall; 2a2, inner convex wall; 2a3, screw mounting holes; 2a4, connecting hole; 2b, a rear pull fork; 2b1, fork blades; 3. hinging a shaft; 4. connecting a sleeve; 4a, a mounting rack; 4a1, scaffold; 4a11, a first screw mounting hole; 4b, a connecting plate; 4c, positioning holes; 4d, a guide block; 5. a telescopic sleeve; 5a, a through hole; 5b, a guide groove; 6. a roller; 7. a v-shaped spring; 7a, a first convex column; 8. a cylindrical spring; 8a and a second convex column.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 to 8 and 10 to 12, the foldable bicycle includes a front frame 1 having a front end for connecting a front fork 11 and a rear fork 2 having a rear end for mounting a rear wheel, the rear fork 2 includes a yoke 2a and a rear fork 2b integrally formed with the yoke 2a, one inner sidewall of a fork opening of the yoke 2a has an inner concave wall 2a1, the other inner sidewall of the fork opening of the yoke 2a has an inner convex wall 2a2, the inner concave wall 2a1 and the inner convex wall 2a2 are obliquely arranged toward one side of the front frame 1, a lower portion of the front frame 1 has an obliquely arranged boss 1a, the boss 1a is arranged between the inner concave wall 2a1 and the inner convex wall 2a2, a hinge shaft 3 is inserted into the boss 1a, both ends of the hinge shaft 3 are respectively connected to both sides of the yoke 2a and the yoke 2a is rotatable around the hinge shaft 3, both sides of the yoke 2a are provided with screw mounting holes 2a3, two screw mounting holes 2a3 correspond with articulated shaft 3 both ends respectively, all have the step in two screw mounting holes 2a3, be equipped with the screw in two screw mounting holes 2a3 respectively and be connected with articulated shaft 3 both ends, two screw mounting holes 2a3 make the screw pass respectively and make articulated shaft 3 both ends respectively with screwed connection, thereby just realized articulated shaft 3 with clevis 2 a's articulated, still have connecting hole 2a4 that is used for the footboard installation on clevis 2a, connecting hole 2a4 is used for the running-board installation, the back end of pull fork 2b has two fork pieces 2b1 that are used for wheel installation that set up relatively, fork piece 2b1 makes the wheel installation dismantle more convenient.

Be equipped with adapter sleeve 4 on the back fork 2, it has telescopic tube 5 to slide in adapter sleeve 4 to peg graft, 4 one ends of adapter sleeve and 5 one ends of telescopic tube all rotate and are connected with gyro wheel 6, two gyro wheels 6 are located the left and right sides of back fork 2, one of them gyro wheel 6 rotates with 4 one ends of adapter sleeve to be connected, another gyro wheel 6 rotates with telescopic tube 5's outer end to be connected for conventional means, can be that one of them gyro wheel 6 rotates through the round pin axle and connects on 4 one ends of adapter sleeve, another gyro wheel 6 rotates through the round pin axle and connects in 5 outer ends of telescopic tube, or 4 one ends of adapter sleeve and bolt spiro union, one of them gyro wheel 6 wears to establish on the bolt and bolt outer end coupling nut, 5 outer ends of telescopic tube and bolt spiro union, another gyro wheel 6.

The connecting sleeve 4 is provided with a mounting frame 4a, the mounting frame 4a is provided with an L-shaped bracket 4a1, the bracket 4a1 is connected with the connecting sleeve 4 through two connecting plates 4b, the bracket 4a1 is provided with a screw mounting hole 4a11, the mounting frame 4a is integrally mounted on the bicycle through the screw mounting hole 4a11, so that the connecting sleeve 4 is more convenient to mount and dismount, when the rear fork 2b is connected with the connecting seat 1d1, the connecting sleeve 4 is close to the joint of the rear fork 2b and the connecting seat 1d1, after the bicycle is folded, the connecting sleeve 4 is ensured to be positioned below the rear fork 2b after the bicycle is folded, the connecting sleeve 4 is internally provided with a strip-shaped guide block 4d along the length direction, the outer surface of the telescopic sleeve 5 is provided with a guide groove 5b matched with the guide block 4d, the guide blocks 4d are two, and the centers of the two guide blocks 4d are symmetrically arranged inside the connecting sleeve 4, guide way 5b also is two, and two guide way 5b centrosymmetric settings are on telescopic tube 5's surface, and guide block 4d and the cooperation of guide way 5b make telescopic tube 5 can stably slide along adapter sleeve 4, and guide block 4d and guide way 5b are two and make telescopic tube 5 slide more stably along adapter sleeve 4.

The positioning structure capable of locking the telescopic sleeve 5 and the connecting sleeve 4 is arranged between the telescopic sleeve 5 and the connecting sleeve 4 and comprises a v-shaped elastic sheet 7, the v-shaped elastic sheet 7 is arranged in the telescopic sleeve 5, at least one end of the v-shaped elastic sheet 7 is provided with a first convex column 7a, the upper end of the first convex column 7a is provided with a chamfer facilitating the first convex column 7a to be clamped into the positioning hole 4c, the telescopic sleeve 5 is provided with a through hole 5a allowing the first convex column 7a to penetrate out, the connecting sleeve 4 is provided with at least two positioning holes 4c capable of enabling the first convex column 7a to be clamped into the connecting sleeve 4 in the length direction, the at least two positioning holes 4c are used for clamping the first convex column 7a, positioning after telescopic adjustment of the telescopic sleeve 5 and the connecting sleeve 4 is achieved, the v-shaped elastic sheet 7 can enable the first convex column 7a to stretch, and.

Be equipped with the guide block 4d that is the bar along length direction in the

adapter sleeve

4, 5 surfaces of telescopic tube are equipped with guide block 4d matched with guide way 5b, guide block 4d is two, two guide block 4d centrosymmetric settings are in adapter sleeve 4's inside, guide way 5b also is two, two guide way 5b centrosymmetric settings are on telescopic tube 5's surface, guide block 4d and guide way 5b cooperation make telescopic tube 5 can stably slide along adapter sleeve 4, be equipped with the recess on adapter sleeve 4, locating hole 4c is located on the diapire of recess, thereby recess be convenient for operate projection one 7a makes projection one 7a compression v-shaped shell fragment 7 make projection one 7a break away from locating hole 4c, be convenient for telescopic tube 5 flexible location operation.

The front frame 1 comprises a cross beam 1bc, one end of the cross beam 1bc is connected with a seat tube 1b, the other end of the cross beam 1bc is connected with a front tube 1c for installing a front fork 11, a pipe clamp 1d is further connected between the cross beam 1bc and the seat tube 1b, a shaft sleeve 1a is arranged at one end of the pipe clamp 1d and is positioned below the cross beam 1bc, the other end of the pipe clamp 1d is provided with a connecting seat 1d1, a connecting seat 1d1 is positioned at the rear end of the front frame 1, a bolt hole 1d11 is formed in a connecting seat 1d1, a rear pull fork 2b can be inserted into a bolt, a connecting column is arranged on the rear pull fork 2b, a positioning pin is arranged on the connecting column, the bolt is provided with a positioning groove matched with the positioning pin, the bolt can be inserted into the bolt hole 1d11 to enable the bolt to be inserted into the positioning pin and also enable the bolt to be separated from the bolt hole 1d11 to enable the positioning pin to be separated, when the bicycle frame needs to be folded, the rear fork 2b is separated from the connected screw for locking, so that the rear fork 2b is separated from the connecting seat 1d1 for fixed connection, and the rear fork 2 can rotate around the hinge shaft 3 for realizing the folding operation.

Folding the bicycle, the connecting fork 2a rotates around the hinge shaft 3, the hinge shaft 3 is obliquely arranged, the connecting fork 2a drives the rear pull fork 2b, the rear end of the rear fork 2 is positioned at one side of the front fork 11, the first convex column 7a is pressed to enable the first convex column 7a to compress the v-shaped elastic sheet 7 so as to enable the first convex column 7a to be separated from the positioning hole 4c, the roller 6 connected with the telescopic sleeve 5 is pulled, the telescopic sleeve 5 slides along the connecting sleeve 4 and penetrates out from the other end of the connecting sleeve 4 until the corresponding positioning hole 4c is reached, the v-shaped elastic sheet 7 is reset to enable the first convex column 7a to be clamped into the corresponding positioning hole 4c, the telescopic sleeve 5 and the connecting sleeve 4 are repositioned, the roller 6 on the telescopic sleeve 5 moves towards the other side of the front fork 11, and the supporting points of the four positions of the two rollers 6, the wheel installed on the rear end of the rear fork 2 and the wheel installed on the front fork 11 enable the folded bicycle to stand, the folded bicycle can be directly dragged or pushed by rolling through the two idler wheels 6, so that the folded bicycle is convenient and labor-saving to drag or push.

Example two

As shown in fig. 9, the present embodiment is substantially the same as the first embodiment, except that the positioning structure includes a cylindrical spring 8, the cylindrical spring 8 is disposed in the telescopic tube 5, one end of the cylindrical spring 8 is provided with a second protruding column 8a, the telescopic tube 5 is provided with a through hole 5a for the second protruding column 8a to penetrate through, the connection tube 4 is provided with at least two positioning holes 4c arranged along the length direction of the connection tube 4, and the upper end of the second protruding column 8a is provided with a chamfer facilitating the second protruding column 8a to be inserted into the positioning holes 4 c.

Folding the bicycle, the connecting fork 2a rotates around the hinge shaft 3, the hinge shaft 3 is obliquely arranged, the connecting fork 2a drives the rear pull fork 2b, the rear end of the rear fork 2 is positioned at one side of the front fork 11, the second convex column 8a is pressed to enable the second convex column 8a to compress the cylindrical spring 8 so as to enable the second convex column 8a to be separated from the positioning hole 4c, the roller 6 connected with the telescopic sleeve 5 is pulled, the telescopic sleeve 5 slides along the connecting sleeve 4 and penetrates out from the other end of the connecting sleeve 4 until the corresponding positioning hole 4c is reached, the cylindrical spring 8 is reset to enable the second convex column 8a to be clamped into the corresponding positioning hole 4c, the telescopic sleeve 5 and the connecting sleeve 4 are repositioned, the roller 6 on the telescopic sleeve 5 moves towards the other side of the front fork 11, the two rollers 6, wheels arranged at the rear end of the rear fork 2 and supporting points at four positions arranged on the front fork 11 enable the folded bicycle to stand on the ground more stably, the folded bicycle can be directly dragged or pushed by rolling through the two idler wheels 6, so that the folded bicycle is convenient and labor-saving to drag or push.

EXAMPLE III

The present embodiment has substantially the same structure as the embodiment, except that the rear fork 2b can be directly fixed to the connecting seat 1d1 by screws.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The utility model provides a foldable bicycle, includes that the front end is used for connecting front fork (11) front frame (1) and rear end are used for installing rear wheel's back fork (2), front frame (1) lower part is articulated through articulated shaft (3) with back fork (2) front end, when back fork (2) rotate relative front frame (1), can make the rear end of back fork (2) be located one side of front fork (11), its characterized in that, the left and right sides of back fork (2) all is equipped with gyro wheel (6), and when the rear end of back fork (2) was located one side of front fork (11), two gyro wheels (6) were located the downside of back fork (2), and one of them gyro wheel (6) can move to the opposite side direction of front fork (11).

2. The foldable bicycle according to claim 1, wherein the rear fork (2) is provided with a connecting sleeve (4), a telescopic sleeve (5) is inserted in the connecting sleeve (4) in a sliding manner, a positioning structure capable of locking the telescopic sleeve (5) and the connecting sleeve (4) is arranged between the telescopic sleeve (5) and the connecting sleeve (4), and the two rollers (6) are respectively connected to one end of the connecting sleeve (4) and one end of the telescopic sleeve (5) in a rotating manner.

3. The foldable bicycle according to claim 2, characterized in that the rear fork (2) comprises a clevis (2a) and a rear fork (2b) integrally formed with the clevis (2a), the rear fork (2b) being detachably connected to the rear end of the front frame (1), the clevis (2a) being rotatably connected to the hinge shaft (3), and the connecting bushing (4) being connected to the rear fork (2 b).

4. The foldable bicycle of claim 3, wherein one inner sidewall of the fork opening of the yoke (2a) has an inner concave wall (2a1), the other inner sidewall of the fork opening of the yoke (2a) has an inner convex wall (2a2), the inner concave wall (2a1) and the inner convex wall (2a2) are obliquely arranged toward one side of the front frame (1), the lower portion of the front frame (1) has an obliquely arranged bushing (1a), the bushing (1a) is arranged between the inner concave wall (2a1) and the inner convex wall (2a2), the hinge shaft (3) is inserted into the bushing (1a), both ends of the hinge shaft (3) are respectively connected to both sides of the fork opening (2a) and the yoke (2a) can rotate around the hinge shaft (3).

5. The foldable bicycle of claim 3 or 4, wherein the clevis (2a) is provided at both sides thereof with screw mounting holes (2a3), two screw mounting holes (2a3) are respectively formed at both ends of the hinge shaft (3), two screw mounting holes (2a3) are respectively formed with steps therein, two screw mounting holes (2a3) are respectively formed with screws therein to be coupled to both ends of the hinge shaft (3), and the clevis (2a) is further provided with coupling holes (2a4) for pedal mounting.

6. The foldable bicycle according to claim 4, wherein the front frame (1) comprises a cross beam (1bc), one end of the cross beam (1bc) is connected with a seat tube (1b), the other end of the cross beam is connected with a front tube (1c) for installing a front fork (11), a tube clamp (1d) is further connected between the cross beam (1bc) and the seat tube (1b), the shaft sleeve (1a) is arranged at one end of the tube clamp (1d) and is located below the cross beam (1bc), the other end of the tube clamp (1d) is provided with a connecting seat (1d1), the connecting seat (1d1) is located at the rear end of the front frame (1), the rear pull fork (2b) is detachably connected with the connecting seat (1d1), the connecting sleeve (4) is provided with a mounting rack (4a), and the mounting rack (4a) is fixedly connected to the rear pull fork (2b), when the rear pull fork (2b) is connected with the connecting seat (1d1), the connecting sleeve (4) is close to the connecting part of the rear pull fork (2b) and the connecting seat (1d 1).

7. The foldable bicycle of claim 6, characterized in that the mounting bracket (4a) has an L-shaped bracket (4a1), the bracket (4a1) is connected with the connecting sleeve (4) through two connecting plates (4b), and the bracket (4a1) is provided with a first screw mounting hole (4a 11).

8. The foldable bicycle according to claim 2, 3 or 4, wherein the positioning structure comprises a v-shaped spring (7), the v-shaped spring (7) is arranged in the telescopic tube (5), at least one end of the v-shaped spring (7) is provided with a first protruding column (7a), the telescopic tube (5) is provided with a through hole (5a) through which the first protruding column (7a) penetrates, and the connecting tube (4) is provided with at least two positioning holes (4c) along the length direction, wherein the first protruding column (7a) can be clamped into the positioning holes.

9. The foldable bicycle according to claim 2, 3 or 4, wherein the positioning structure comprises a cylindrical spring (8), the cylindrical spring (8) is arranged in a telescopic sleeve (5), one end of the cylindrical spring (8) is provided with a second convex column (8a), the telescopic sleeve (5) is provided with a through hole (5a) for the second convex column (8a) to penetrate out, and the connecting sleeve (4) is provided with at least two positioning holes (4c) along the length direction, so that the second convex column (8a) can be clamped into the positioning holes.

10. The foldable bicycle as claimed in claim 2, 3 or 4, wherein the connecting sleeve (4) is internally provided with a strip-shaped guide block (4d) along the length direction, the outer surface of the telescopic sleeve (5) is provided with a guide groove (5b) matched with the guide block (4d), the number of the guide blocks (4d) is two, the two guide blocks (4d) are arranged inside the connecting sleeve (4) in a central symmetry manner, the number of the guide grooves (5b) is also two, and the two guide grooves (5b) are arranged on the outer surface of the telescopic sleeve (5) in a central symmetry manner.