Folding bicycle

Abstract

The embodiment of the application discloses a folding bicycle, which comprises two front wheels, a transmission structure, a left handle, a right handle, a telescopic head tube, a frame and a rear wheel structure; the transmission structure, the left handle, the right handle, the head tube, the frame and the rear wheel structure are foldable; when folding, the left handle and the right handle are folded to be parallel to the head tube, the head tube is folded on the front side of the two front wheels after being contracted, the frame is folded on the rear side of the two front wheels and is located between the two front wheels, the rear wheel is parallel to the two front wheels, the left crank is located on the left side of the two front wheels and is parallel to the two front wheels as a whole, and the right crank is located on the right side of the two front wheels and is parallel to the two front wheels as a whole; the bicycle is small in size after being folded, and is convenient to carry and store through the foldable transmission structure, the left handle, the right handle, the head tube, the frame and the rear wheel structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bicycles, in particular to a folding bicycle. BACKGROUND

[0002] Traditional bicycles are large in size and heavy in weight, and are inconvenient to carry and store. Public buses and subways prohibit carrying such bicycles, so various types of folding bicycles have appeared on the market. These folding bicycles use folding principles to achieve the requirements of light weight, small size and convenient operation to a certain extent.

[0003] The folding bicycles on the market usually fold the frame part, handlebar vertical pipe and handlebar to achieve the purpose of reducing the occupied space. However, this folding method is still relatively large in size after folding the bicycle, which is inconvenient to store and carry. Therefore, a folding bicycle with smaller size after folding is needed. SUMMARY

[0004] Therefore, the present application provides a folding bicycle, which is smaller in size after folding and convenient to store and carry.

[0005] To achieve one or part or all of the above purposes or other purposes, the present application provides a folding bicycle, which comprises two front wheels, a transmission structure, a left handlebar, a right handlebar, a telescopic head pipe, a frame and a rear wheel structure.

[0006] The transmission structure is provided with an output shaft, foldable left and right cranks; one front wheel is connected to one end of the output shaft, and the other front wheel is connected to the other end of the output shaft.

[0007] The bottom end of the head pipe is hinged to the transmission structure, and the top end of the head pipe is provided with a connecting joint. The left handlebar is foldably connected to one end of the connecting joint, and the right handlebar is foldably connected to the other end of the connecting joint.

[0008] The rear wheel structure comprises a suspension frame provided with a foldable rear wheel. One end of the frame is foldably connected to the transmission structure through a quick release switch. The suspension frame is movably connected to the other end of the frame.

[0009] When folding, the left handlebar and the right handlebar are folded to be parallel to the head pipe, the head pipe is folded on the front side of the two front wheels after being retracted, the frame is folded on the rear side of the two front wheels and located between the two front wheels, the rear wheel is parallel to the two front wheels, the left crank is located on the left side of the two front wheels and is parallel to the two front wheels as a whole, and the right crank is located on the right side of the two front wheels and is parallel to the two front wheels as a whole.

[0010] Further, the transmission structure is provided with the quick release switch.

[0011] One end of the frame is connected to the transmission structure through a connecting shaft, and a U-shaped opening is further arranged on the end of the frame;

[0012] Limiting protrusions are arranged on both sides of the U-shaped opening, and limiting nuts are arranged at both ends of the quick release switch, and inner grooves matched with the limiting protrusions are arranged on the inner sides of the limiting nuts;

[0013] The quick release switch has two states of opening and closing, and when in the closed state, the inner grooves are clamped with the limiting protrusions to limit the quick release switch in the U-shaped opening; when in the open state, the inner grooves are separated from the limiting protrusions, and the quick release switch can be separated from the U-shaped opening, and the frame can rotate around the connecting shaft.

[0014] Further, first and second lower limiting parts are further arranged on the transmission structure, one end of the first lower limiting part is connected to the connecting shaft, and the other end of the second lower limiting part is connected to the connecting shaft;

[0015] The end of the first lower limiting part is provided with a first elastic block for limiting the left crank, and the end of the second lower limiting part is provided with a second elastic block for limiting the right crank.

[0016] Further, an input shaft is arranged on the transmission structure, one end of the left crank is provided with a first joint pipe, a first ratchet wheel is arranged in the first joint pipe, the left crank is connected to one end of the input shaft through the first ratchet wheel, one end of the right crank is provided with a second joint pipe, a second ratchet wheel is arranged in the second joint pipe, and the right crank is connected to the other end of the input shaft through the second ratchet wheel.

[0017] Further, first and second upper limiting parts are further arranged on the transmission structure, the first upper limiting part is arranged on one side of the first joint pipe, the second upper limiting part is arranged on one side of the second joint pipe, a first limiting block is arranged on the outer wall of the first joint pipe, and a second limiting block is arranged on the outer wall of the second joint pipe;

[0018] The first upper limiting part comprises a first torsional spring and a first limiting claw, the first limiting claw has a protruding first claw end, the first limiting claw is rotatably sleeved on the transmission structure, one end of the first torsional spring is clamped with the first limiting claw, and the other end is clamped on the transmission structure, so as to limit the first claw end to a limiting position of the first limiting block, and rotating the first limiting claw can make the first claw end deviate from the limiting position of the first limiting block;

[0019] The second upper limit part comprises a second torsion spring and a second limit claw, the second limit claw has a protruding second claw end, the second limit claw is rotatably sleeved to the transmission structure, one end of the second torsion spring is clamped with the second limit claw, the other end is clamped on the transmission structure, the second claw end is limited to the limiting position of the second limit block, and rotating the second limit claw can make the second claw end escape from the limiting position of the second limit block.

[0020] Further, the input shaft is further connected with a third torsion spring and a fourth torsion spring, one end of the third torsion spring is connected with the transmission structure, the other end of the third torsion spring is connected with the left crank, one end of the fourth torsion spring is connected with the transmission structure, and the other end of the fourth torsion spring is connected with the right crank.

[0021] Further, the rear wheel structure further comprises a left wheel arm and a right wheel arm, the rear wheel comprises a left rear wheel and a right rear wheel, and the suspension frame has a left connecting port and a right connecting port.

[0022] One end of the left wheel arm is connected with the left rear wheel, the other end is connected with the left connecting port, and the left wheel arm can be folded by rotating around the axis line of the left connecting port as a center axis; one end of the right wheel arm is connected with the right rear wheel, the other end is connected with the right connecting port, and the right wheel arm can be folded by rotating around the axis line of the right connecting port as a center axis.

[0023] Further, one end of the left crank is connected with a left pedal, and one end of the right crank is connected with a right pedal.

[0024] The left pedal comprises a first anti-rotation assembly, a first connecting pipe and a first pedal, and the right pedal comprises a second anti-rotation assembly, a second connecting pipe and a second pedal.

[0025] The first connecting pipe has a first interface and a second interface arranged perpendicularly to each other, the first anti-rotation assembly is detachably clamped with the left crank, the first anti-rotation assembly penetrates into the first connecting pipe from the first interface and limits the first connecting pipe, and the first pedal is movably connected with the first connecting pipe through the second interface.

[0026] The second connecting pipe has a third interface and a fourth interface arranged perpendicularly to each other, the second anti-rotation assembly is detachably clamped with the right crank, the second anti-rotation assembly penetrates into the second connecting pipe from the third interface and limits the second connecting pipe, and the second pedal is movably connected with the second connecting pipe through the fourth interface.

[0027] Further, the head pipe comprises an upper head pipe and a lower head pipe, the upper head pipe and the lower head pipe are movably sleeved through quick release buckles, and the connecting joint is connected to the top end of the upper head pipe.

[0028] Further, the left handle is provided with a first joint, the right handle is provided with a second joint, the connecting joint is provided with a first connecting port and a second connecting port; the first connecting port is provided with a first clamping position and a second clamping position, the second connecting port is provided with a third clamping position and a fourth clamping position;

[0029] When unfolded, the first joint is connected to the first connecting port and clamped in the first clamping position, and the second joint is connected to the second connecting port and clamped in the third clamping position; when folded, the first joint is connected to the first connecting port and clamped in the second clamping position, and the second joint is connected to the second connecting port and clamped in the fourth clamping position.

[0030] The embodiment of the present application has the following beneficial effects:

[0031] After the above-mentioned folding bicycle is used, by folding the left handle and the right handle to be parallel to the head tube, folding the head tube to be folded on the front side of the front wheels, folding the frame to be folded on the rear side of the front wheels and between the front wheels, folding the rear wheel to be parallel to the front wheels, folding the left crank to the left side of the front wheels, and folding the right crank to the right side of the front wheels, the bicycle is folded, and each structure is close to the front wheels, so that the volume is small, and the bicycle is convenient to carry and store. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Among them:

[0034] Figure 1 It is an exploded view of the folding bicycle in the use state according to the present application;

[0035] Figure 2 It is Figure 1 It is an enlarged view of A in FIG. 1;

[0036] Figure 3 It is a structural schematic view of the folding bicycle in the use state according to the present application;

[0037] Figure 4 It is a structural schematic view of the folding bicycle in the folded state according to the present application;

[0038] Figure 5 It is an exploded view of the quick release lock catch of the folding bicycle according to the present application;

[0039] Figure 6 The exploded view of the second limiting claw of the folding bicycle proposed in the present application;

[0040] Figure 7 The exploded view of the handlebar of the folding bicycle proposed in the present application;

[0041] Figure 8 The schematic view of the connecting joint of the folding bicycle proposed in the present application;

[0042] Figure 9 The exploded view of the second ratchet wheel of the folding bicycle proposed in the present application;

[0043] Figure 10 The exploded view of the rear wheel structure of the folding bicycle proposed in the present application;

[0044] Figure 11 The schematic view of the frame of the folding bicycle proposed in the present application;

[0045] Figure 12 The side view of the folding bicycle proposed in the present application in use;

[0046] Figure 13 The schematic view of the left wheel arm of the folding bicycle proposed in the present application;

[0047] Figure 14 The schematic view of the first anti-rotation assembly and the left crank of the folding bicycle proposed in the present application;

[0048] Figure 15 The schematic view of the first anti-rotation stopper of the folding bicycle proposed in the present application.

[0049] Reference signs:

[0050] 10 - front wheel; 11 - left fender; 12 - right fender;

[0051] 20 - transmission structure; 21 - connecting shaft; 22 - quick release switch; 221 - limiting nut; 222 - inner groove; 23 - first lower limiting part; 231 - first elastic block; 24 - second lower limiting part; 241 - second elastic block; 25 - first upper limiting part; 251 - first torsional spring; 252 - first limiting claw; 2521 - first claw end; 26 - second upper limiting part; 261 - second torsional spring; 262 - second limiting claw; 2621 - second claw end; 27 - input shaft; 271 - third torsional spring; 272 - fourth torsional spring; 28 - output shaft;

[0052] 31 - left crank; 311 - first joint pipe; 3111 - first limiting block; 312 - first ratchet wheel; 3121 - first tooth seat; 3122 - first elastic sheet; 3123 - first ratchet tooth; 3124 - first tooth sleeve; 32 - right crank; 322 - second joint pipe; 3221 - second limiting block; 323 - second ratchet wheel; 3231 - second tooth seat; 3232 - second elastic sheet; 3233 - second ratchet tooth; 3234 - second tooth sleeve; 33 - left pedal; 331 - first anti-rotation assembly; 3311 - third elastic sheet; 3312 - first anti-rotation stopper; 3313 - screw; 332 - first connecting pipe; 3321 - first interface; 3322 - second interface; 333 - first pedal; 34 - right pedal; 341 - second anti-rotation assembly; 342 - second connecting pipe; 3421 - third interface; 3422 - fourth interface; 343 - second pedal;

[0053] 41 - left handle; 411 - first joint; 4111 - first opening; 412 - first limiting ring; 413 - first limiting screw; 414 - first spring; 415 - first main rod; 416 - first connecting rod; 42 - right handle; 421 - second joint; 4211 - second opening; 422 - second limiting ring; 423 - second limiting screw; 424 - second spring; 425 - second main rod; 426 - second connecting rod; 43 - connecting joint; 431 - first connecting interface; 4311 - first limiting notch; 4312 - second limiting notch; 432 - second connecting interface; 4321 - third limiting notch; 4322 - fourth limiting notch; 44 - head pipe; 441 - upper head pipe; 4411 - limiting groove; 442 - lower head pipe; 4421 - lower pipe connecting joint; 4422 - inclined structure; 443 - quick release lock; 4431 - quick release locking ring; 4432 - quick release compression screw; 4433 - first rotation-stopping screw; 4434 - wear-resistant gasket; 4435 - quick release pull rod; 4436 - pull rod connecting shaft; 4437 - quick release handle; 4438 - second rotation-stopping screw;

[0054] 50 - frame; 52 - U-shaped opening; 521 - limiting protrusion;

[0055] 60 - rear wheel structure; 61 - left rear wheel; 62 - right rear wheel; 63 - suspension frame; 631 - left connecting interface; 632 - right connecting interface; 633 - connecting rod; 64 - left wheel arm; 641 - third joint; 6411 - first notch; 6412 - second notch; 642 - first positioning member; 65 - right wheel arm; 651 - fourth joint; 6511 - third notch; 6512 - fourth notch; 652 - second positioning member. DETAILED DESCRIPTION

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise" and "comprising", or "have" and "having", or "include" and "including" and any variations thereof, is intended to cover a non-exclusive inclusion; the use herein of terms such as "first", "second" and the like is intended to distinguish between similar objects only and is not intended to designate a particular order or sequence unless otherwise defined.

[0057] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment.

[0058] For those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings.

[0059] With reference to Figures 1 to 15 The application provides a folding bicycle, comprising two front wheels 10, a transmission structure 20, a left handle 41, a right handle 42, a telescopic head tube 44, a frame 50 and a rear wheel structure 60;

[0060] The transmission structure 20 is provided with an output shaft 28, foldable left and right cranks 31 and 32; one front wheel 10 is connected to one end of the output shaft 28, and the other front wheel 10 is connected to the other end of the output shaft 28;

[0061] The bottom end of the head tube 44 is hinged to the transmission structure 20, and the top end of the head tube 44 is provided with a connecting joint 43; the left handle 41 is foldably connected to one end of the connecting joint 43, and the right handle 42 is foldably connected to the other end of the connecting joint 43;

[0062] The rear wheel structure 60 comprises a suspension frame 63 provided with foldable rear wheels, and one end of the frame 50 is foldably connected to the transmission structure 20 through a quick release switch 22; the suspension frame 63 is movably connected to the other end of the frame 50;

[0063] When folded, the left handle 41 and the right handle 42 are folded to be parallel to the head tube 44, the head tube 44 is folded to the front side of the two front wheels 10 after being retracted, the frame 50 is folded to the rear side of the two front wheels 10 and located between the two front wheels 10, the rear wheel is parallel to the two front wheels 10, the left crank 31 is located on the left side of the two front wheels 10 and is parallel to the two front wheels 10 as a whole, and the right crank 32 is located on the right side of the two front wheels 10 and is parallel to the two front wheels 10 as a whole.

[0064] In this embodiment, since the above-mentioned folding bicycle can be without a seat structure, the cranks and the pedals connected to the cranks are the main load-bearing mechanisms, so the materials used for these structures need to have higher strength or be stronger than the common cranks and pedals, for example, high-strength alloys, steel materials, etc. Different from the traditional bicycle, the above-mentioned folding bicycle is driven by the transmission structure 20 to move the front wheels 10 actively, and the rear wheel structure 60 follows the movement. The user drives the left crank 31 and the right crank 32 to rotate up and down by alternately pedaling the left pedal 33 and the right pedal 34, and transmits power to the transmission structure 20. The two front wheels 10 are arranged in parallel and spaced apart by a certain distance. Compared with the traditional bicycle which sets the transmission chain on one side of the wheel, the transmission structure 20 in this embodiment is located between the two front wheels 10, so that the overall structure of the bicycle is compact and the space occupation is reduced. Moreover, such arrangement can make the transmission of power more balanced and not biased to the left or right, and the loss caused in the process of force transmission is smaller, so that the bicycle is more labor-saving and efficient to ride. In addition, the inner side of one front wheel 10 is provided with a left windshield 11, and the inner side of the other front wheel 10 is provided with a right windshield 12, which can block the water or mud encountered during riding to prevent clothes from getting dirty. When riding the bicycle, the user can hold the left handle 41 and the right handle 42 for support. In addition, a length adjusting component can be provided on the head tube 44, for example, a plurality of limiting buckles are arranged on the telescopic head tube 44. The user can adjust the height of the handle according to his own height, and when the bicycle is unfolded, the left handle 41, the right handle 42 and the head tube 44 form a "Y" shape as a whole. When riding, the user's hands need to stretch forward for a distance to better exert force and control the handlebar. Referring to Figure 12 , the two handles are slightly stretched forward, which can be suitable for riding in the case of a smaller overall structure of the bicycle, and the design conforms to ergonomics. The transmission structure 20 has an outer protective shell which can support the frame 50 and play a connecting role. The rear wheel structure 60 functions as a balancing wheel and a supporting wheel. The rear wheel includes a left rear wheel 61 and a right rear wheel 62. Compared with the front wheel 10, the distance between the left rear wheel 61 and the right rear wheel 62 is larger, which can assist the user to maintain balance and stabilize the center of gravity during riding, making the bicycle easier to ride.

[0065] The transmission structure 20, the left handle 41, the right handle 42, the frame 50 and the rear wheel structure 60 of the bicycle all have a use state and a folding state, as shown in Figure 4 The frame 50 is rotated to between the two front wheels 10, the rear wheel is rotated to a position parallel to the two front wheels 10 through the connecting rod 633 connected with the suspension frame 63, the left crank 31 is rotated to the left side of the front wheel 10, the right crank 32 is rotated to the right side of the front wheel 10, the handle tube 44 is compressed, the left handle 41 and the right handle 42 are rotated to a position parallel to the handle tube 44, the handle tube 44 is rotated around the bottom to the front side of the front wheel 10, and the bicycle is in the folding state. At this time, the whole vehicle is close to the front wheel 10, and the volume of the whole vehicle is small, which is convenient for storage and carrying.

[0066] In an embodiment, the transmission structure 20 is provided with a quick release switch 22.

[0067] One end of the frame 50 is connected to the transmission structure 20 through a connecting shaft 21, and the end of the frame 50 is also provided with a U-shaped opening 52.

[0068] The two sides of the U-shaped opening 52 are respectively provided with limiting protrusions 521, and the two ends of the quick release switch 22 are respectively provided with limiting nuts 221, and the inner side of the limiting nut 221 is provided with an inner groove 222 matched with the limiting protrusion 521.

[0069] The quick release switch 22 has two states of opening and closing. In the closed state, the inner groove 222 is clamped with the limiting protrusion 521, so that the quick release switch 22 is limited in the U-shaped opening 52. In the open state, the inner groove 222 is separated from the limiting protrusion 521, so that the quick release switch 22 is separated from the U-shaped opening 52, and the frame 50 can rotate around the connecting shaft 21.

[0070] In the embodiment, the housing of the transmission structure 20 is rotationally connected with the frame 50 through the connecting shaft 21, the quick release switch 22 is arranged on the housing of the transmission structure 20, the U-shaped opening 52 on the frame 50 can be clamped on the quick release switch 22 for fixation, the quick release switch 22 functions like a fixing pin, and can change the rotational connection between the transmission structure 20 and the frame 50 into a fixed connection. Of course, separating the U-shaped opening 52 from the quick release switch 22 can make the rotational connection state reappear. When the above-mentioned folding bicycle needs to be folded, the limit nuts 221 at both ends of the quick release switch 22 are loosened by pulling the lever of the quick release switch 22. At this time, the inner recess 222 on the inner side of the limit nut 221 is separated from the U-shaped limit protrusion 521 on the outer side of the U-shaped opening 52, the U-shaped opening 52 is no longer limited by the inner recess 222, and the U-shaped opening 52 can be separated from the rod of the quick release switch 22, so that only the connecting shaft 21 is left to connect the transmission structure 20 and the frame 50, to realize rotational folding. Correspondingly, when in use, the quick release switch 22 is tightened, the inner recess 222 of the limit nut 221 is clamped with the limit protrusion 521 of the U-shaped opening 52, the U-shaped opening 52 is clamped on the quick release switch 22 to realize the fixing function.

[0071] In one embodiment, the transmission structure 20 is further provided with a first lower limit portion 23 and a second lower limit portion 24, the first lower limit portion 23 is connected with one end of the connecting shaft 21, and the second lower limit portion 24 is connected with the other end of the connecting shaft 21.

[0072] The end of the first lower limit portion 23 is provided with a first elastic block 231 for limiting the left crank 31, and the end of the second lower limit portion 24 is provided with a second elastic block 241 for limiting the right crank 32.

[0073] In the embodiment, unlike the traditional pedal bicycle, the pedals of the above-mentioned folding bicycle are alternately reciprocated in a curve, i.e., only move up and down in a range of about 100 degrees during use, so that in the process of downward movement of the crank, the lower limit portion is needed to limit the crank to reduce the idle stroke. When the user needs to rest, the lower limit portion can also support the crank. Specifically, referring to Figure 1 and Figure 3The left crank 31 is connected to the left side of the upper end of the transmission structure 20, and the right crank 32 is symmetrically arranged with the left crank 31. The connecting shaft 21 is located at the position close to the lower part of the upper end of the transmission structure 20. Taking the left crank 31 and the first lower limiting part 23 as an example, the right crank 32 and the second lower limiting part 24 are similar. When the left crank 31 abuts against the first lower limiting part 23, the left crank 31 is located at the lower limit position of rotation. At this time, the first lower limiting part 23 is close to the middle part of the left crank 31 as much as possible, so as to avoid that the force arm is too long when the left crank 31 is under stress, and the pressure of the first lower limiting part 23 or the connection between the left crank 31 and the transmission structure 20 is too large. If the material strength of the left crank 31 or the transmission structure 20 is not enough, the rupture danger is easy to occur. In addition, the first elastic block 231 is arranged at the end of the first lower limiting part 23, which can form a buffering effect when the left crank 31 abuts against the first lower limiting part 23. The first elastic block 231 can protect the left crank 31, and because the person is standing and riding, the first elastic block 231 has elasticity and can play a certain shock-absorbing effect.

[0074] In one embodiment, the transmission structure 20 is provided with an input shaft 27, one end of the left crank 31 is provided with a first joint pipe 311, the first joint pipe 311 is provided with a first ratchet wheel 312, the left crank 31 is connected with one end of the input shaft 27 through the first ratchet wheel 312, one end of the right crank 32 is provided with a second joint pipe 322, the second joint pipe 322 is provided with a second ratchet wheel 323, and the right crank 32 is connected with the other end of the input shaft 27 through the second ratchet wheel 323.

[0075] In the embodiment, the two ends of the input shaft 27 are connected with the left crank 31 and the right crank 32 respectively, the power of the two cranks is transmitted to the transmission structure 20, and the front wheel 10 is driven to rotate. Taking the first ratchet wheel 312 as an example, the second ratchet wheel 323 is similar. The first ratchet wheel 312 includes a first tooth seat 3121, a first elastic piece 3122, a first ratchet tooth 3123 and a first tooth sleeve 3124, as shown in Figure 9As shown, the second ratchet wheel 323 comprises a second tooth seat 3231, a second elastic sheet 3232, a second ratchet tooth 3233 and a second tooth sleeve 3234. The first ratchet wheel 312 is connected to the first tooth seat 3121 at the left end of the input shaft 27 through the first tooth sleeve 3124 arranged inside the front end of the left crank 31, so as to realize the one-way rotation of the input shaft 27 relative to the left crank 31. That is, the first ratchet tooth 3123 is clamped on the first tooth seat 3121 through the first elastic sheet 3122 abutting against one end of the first ratchet tooth 3123 and the other end of the first tooth seat 3121, so as to realize the one-way locking by engaging the first ratchet tooth 3123 with the first tooth sleeve 3124. In specific use, when the left crank 31 moves downward, the left crank 31 and the input shaft 27 are in the locking state, the left crank 31 drives the input shaft 27 to rotate, the input shaft 27 does work, and the power input is realized. When the left crank 31 moves upward, the left crank 31 and the input shaft 27 are in the non-locking state, the left crank 31 is returned upward and the input shaft 27 does not rotate, that is, the upward movement is the idle stroke of the left crank 31. It is worth mentioning that the number of the first elastic sheet 3122 and the first ratchet tooth 3123 can be set according to needs, which can be one, two, three or the like.

[0076] In one embodiment, the transmission structure 20 is further provided with a first upper limit portion 25 and a second upper limit portion 26. The first upper limit portion 25 is arranged on one side of the first joint pipe 311, and the second upper limit portion 26 is arranged on one side of the second joint pipe 322. The outer wall of the first joint pipe 311 is provided with a first limiting block 3111, and the outer wall of the second joint pipe 322 is provided with a second limiting block 3221.

[0077] The first upper limit portion 25 comprises a first torsional spring 251 and a first limiting claw 252. The first limiting claw 252 has a protruding first claw end 2521. The first limiting claw 252 is rotatably sleeved on the transmission structure 20. One end of the first torsional spring 251 is clamped with the first limiting claw 252, and the other end is clamped on the transmission structure 20. The first claw end 2521 is limited to the limiting position of the first limiting block 3111. Rotating the first limiting claw 252 can make the first claw end 2521 deviate from the limiting position of the first limiting block 3111.

[0078] The second upper limit portion 26 comprises a second torsional spring 261 and a second limiting claw 262. The second limiting claw 262 has a protruding second claw end 2621. The second limiting claw 262 is rotatably sleeved on the transmission structure 20. One end of the second torsional spring 261 is clamped with the second limiting claw 262, and the other end is clamped on the transmission structure 20. The second claw end 2621 is limited to the limiting position of the second limiting block 3221. Rotating the second limiting claw 262 can make the second claw end 2621 deviate from the limiting position of the second limiting block 3221.

[0079] In the embodiment, specifically, taking the left crank 31 side as an example, the right crank 32 side is similar, the front end of the left crank 31, that is, the end of the left crank 31 connected with the input shaft 27, the first joint pipe 311 is a hollow tubular, sleeved on the first ratchet 312, the inner wall of the first joint pipe 311 is provided with a toothed structure, which can cooperate with the first tooth sleeve 3124, with the upward rotation of the first joint pipe 311, the first limiting block 3111 will abut against the first claw end 2521 of the first limiting claw 252, and the first limiting claw 252 forms a limit to the first limiting block 3111, as shown in Figure 6 The first limiting claw 252 includes a first torsional spring 251, one end of the first torsional spring 251 is clamped on the first limiting claw 252, and the other end is clamped on the shell of the transmission structure 20, when it is necessary to fold the folding bicycle, the first limiting claw 252 can be rotated upward, so that the first claw end 2521 is away from the rotation path of the first limiting block 3111, and the first limiting block 3111 can no longer be blocked, then the left crank 31 can be rotated upward and forward without obstruction to fold to the side of the front wheel 10, when the left crank 31 is folded to the position as shown in Figure 4 The first limiting claw 252 is loosened, the first torsional spring 251 drives the first limiting claw 252 to rotate back, clamps the first limiting block 3111, so that the left crank 31 is fixed in the folded state.

[0080] When the bicycle is in use, taking the coordinate origin located on the input shaft 27 and the X axis facing the front of the bicycle as an example, by setting the first upper limiting part 25, the second upper limiting part 26, the first lower limiting part 23 and the second lower limiting part 24, the lower limit positions of the left crank 31 and the right crank 32 can be set at an angle of 180 degrees to 240 degrees with the X axis, when riding, the user pedals in a range of about 100 degrees, for example, pedals in a range of 135 degrees to 225 degrees, which can always pedal in the most efficient angle interval, and the up and down reset also saves a lot of idle stroke compared with 360 degree circular motion. In this case, the crank can be longer than the crank of the ordinary bicycle, according to the principle of lever, the longer the force arm, the more labor-saving, and the crank of the ordinary bicycle cannot reach the ground, which limits its length. In addition, this up and down pedaling is more suitable for standing riding, so the human body gravity is also fully utilized, so it is easier to ride. Standing riding can also fully utilize the body gravity to ride, and the above three points make the pedaling system more than 50% more efficient than the ordinary bicycle.

[0081] In one embodiment, the input shaft 27 is also connected with a third torsional spring 271 and a fourth torsional spring 272, one end of the third torsional spring 271 is connected with the transmission structure 20, the other end of the third torsional spring 271 is connected with the left crank 31, one end of the fourth torsional spring 272 is connected with the transmission structure 20, and the other end of the fourth torsional spring 272 is connected with the right crank 32.

[0082] In this embodiment, in order for the left crank 31 and the right crank 32 to automatically rebound upward after the downward working process is completed, the two ends of the input shaft 27 are respectively provided with a third torsion spring 271 and a fourth torsion spring 272 that cooperate with them. Taking the left crank 31 side as an example, when the left crank 31 is stepped on and rotated downward, it drives the third torsion spring 271 to rotate and tighten. At this time, the third torsion spring 271 continuously accumulates elastic potential energy. When the user shifts the center of gravity and applies force to the right crank 32, the left crank 31 is not subjected to downward force. At this time, the elastic potential energy of the third torsion spring 271 is released, driving the left crank 31 to rotate upward, which makes it convenient for the user to pedal back and forth for riding.

[0083] In one embodiment, the rear wheel structure 60 further includes a left wheel arm 64 and a right wheel arm 65, the rear wheel includes a left rear wheel 61 and a right rear wheel 62, and the suspension frame 63 has a left connection port 631 and a right connection port 632.

[0084] The left wheel arm 64 is connected to the left rear wheel 61 at one end and to the left connector 631 at the other end. The left wheel arm 64 can rotate and fold with the axis of the left connector 631 as the central axis. The right wheel arm 65 is connected to the right rear wheel 62 at one end and to the right connector 632 at the other end. The right wheel arm 65 can rotate and fold with the axis of the right connector 632 as the central axis.

[0085] In this embodiment, for the rear wheel structure 60, the aforementioned suspension bracket 63 can be a one-piece molded part, or it can be formed by welding and splicing several parts. It can be a V-shaped part or a T-shaped part. It is worth mentioning that when the suspension bracket 63 is connected to the lower rear end of the vehicle body, the left connection port 631 and the right connection port 632 are slightly tilted upwards, while the corresponding end of the left wheel arm 64 connected to the left rear wheel 61 is slightly tilted downwards to adapt to the left connection port 631. The specific structure of the right wheel arm 65 is similar to that of the left wheel arm 64. Thus, after connection, when both the left rear wheel 61 and the right rear wheel 62 are in the use position, the left rear wheel 61 and the right rear wheel 62 are generally in an outward "V" shape. Figure 10 and Figure 13 For example, the left wheel arm 64 is provided with a third connector 641, which has a first notch 6411 and a second notch 6412. At this time, the third connector 641 and the first positioning member 642 are engaged through the first notch 6411. Similar to the left wheel arm 64, the right wheel arm 65 is provided with a fourth connector 651, which has a third notch 6511 and a fourth notch 6512. At this time, the fourth connector 651 and the second positioning member 652 are engaged through the third notch 6511. When the left rear wheel 61 and the right rear wheel 62 are in the folded position, the first positioning member 642 can be disengaged from the first notch 6411 by external force and rotated to engage with the second notch 6412, so that the second positioning member 652 disengages from the third notch 6511 and rotates to engage with the fourth notch 6512, thereby realizing the folding and fixing of the left rear wheel 61 and the right rear wheel 62.

[0086] In one embodiment, the left crank 31 is connected with a left pedal 33 at one end, and the right crank 32 is connected with a right pedal 34 at one end;

[0087] The left pedal 33 comprises a first anti-rotation assembly 331, a first connecting pipe 332 and a first pedal 333; the right pedal 34 comprises a second anti-rotation assembly 341, a second connecting pipe 342 and a second pedal 343;

[0088] The first connecting pipe 332 has a first interface 3321 and a second interface 3322 arranged perpendicularly to each other, the first anti-rotation assembly 331 is detachably connected with the left crank 31, the first anti-rotation assembly 331 penetrates into the first connecting pipe 332 from the first interface 3321 and limits the first connecting pipe 332, and the first pedal 333 is movably connected with the first connecting pipe 332 through the second interface 3322;

[0089] The second connecting pipe 342 has a third interface 3421 and a fourth interface 3422 arranged perpendicularly to each other, the second anti-rotation assembly 341 is detachably connected with the right crank 32, the second anti-rotation assembly 341 penetrates into the second connecting pipe 342 from the third interface 3421 and limits the second connecting pipe 342, and the second pedal 343 is movably connected with the second connecting pipe 342 through the fourth interface 3422.

[0090] In the embodiment, in addition to the above folding steps, the left pedal 33 can be rotated 90 degrees around the left crank 31 to be attached to the left side of the front wheel 10, and the right pedal 34 can be rotated 90 degrees around the right crank 32 to be attached to the right side of the front wheel 10, so that the size of the folded bicycle is further reduced. In addition, as shown in the figure, the first connecting pipe 332 is similar to the second connecting pipe 342, which is a "T" type or "L" type connecting pipe, the two end pipe orifices of the second connecting pipe 342 are arranged perpendicularly to each other, one end of the second connecting pipe 342 is sleeved on the rear end of the right crank 32, and the second connecting pipe 342 can rotate around the axis of the rear end of the right crank 32. Similarly, the other end of the second connecting pipe 342 is connected to one end of the right pedal 34, and the right pedal 34 as a whole can rotate around the axis of the rear end of the right crank 32 and be attached to the right side of the front wheel 10. Figure 2 In addition, in order to form support for the user's foot when using the left pedal 33, a mechanism for preventing the first connecting pipe 332 from rotating is arranged on the first connecting pipe 332, the first anti-rotation assembly 331 is one part or a combination of several parts with a circumferential limiting structure, for example, the first anti-rotation assembly 331 is composed of a third elastic sheet 3311, a first anti-rotation stop sheet 3312 and a screw 3313, as shown in the figure, the third elastic sheet 3311 is arranged on the first connecting pipe 332, the first anti-rotation stop sheet 3312 is arranged on the third elastic sheet 3311, and the screw 3313 is arranged on the first anti-rotation stop sheet 3312 and penetrates into the first connecting pipe 332.

[0091] Figure 14 Figure 15 ​​As shown, the inner side of the first anti-rotation stopper 3312 is provided with an inwardly protruding quadrangular protrusion, and the end face of the end of the left crank 31 is provided with a quadrangular recess, the quadrangular protrusion and the quadrangular recess are engaged, and the first anti-rotation stopper 3312 is fixed to the end of the left crank 31 by the screw 3313, so that the first anti-rotation stopper 3312 cannot rotate circumferentially, at this time, the third elastic sheet 3311 is clamped between the first anti-rotation stopper 3312 and the first connecting pipe 332, so as to increase the rotation friction of the first connecting pipe 332, that is, only when the first pedal 333 is pulled very hard, the first pedal 333 can rotate. In different embodiments, some clamping blocks can also be provided on the first connecting pipe 332 and the end of the left crank 31, that is, the inner side wall of the first connecting pipe 332 and the outer side wall of the end of the left crank 31 are provided with clamping blocks matched with each other, so as to fix the left pedal 33 in the folded position when the first pedal 333 is folded outward to be parallel to the horizontal plane; the second connecting pipe 342 is similar to the first connecting pipe 332, and details are not described herein.

[0092] In an embodiment, the head pipe 44 comprises an upper head pipe 441 and a lower head pipe 442, the upper head pipe 441 and the lower head pipe 442 are movably sleeved by quick release buckles 443, and the connecting joint 43 is connected to the top end of the upper head pipe 441.

[0093] In the embodiment, the head pipe 44 is provided in two sections, that is, the upper head pipe 441 and the lower head pipe 442, and the upper head pipe 441 and the lower head pipe 442 are movably sleeved, so that the length after folding can be reduced, and the volume after folding can be reduced. Figure 5As shown, the quick-release lock buckle 443 includes a quick-release locking ring 4431, a quick-release compression screw 4432, a first anti-rotation screw 4433, a wear-resistant gasket 4434, a quick-release pull rod 4435, a pull rod connecting shaft 4436, a quick-release wrench 4437, and a second anti-rotation screw 4438. The upper handle tube 441 is provided with a limiting groove 4411 arranged along the length direction thereof. The top end of the lower handle tube 442 is provided with a limiting hole and a tension groove. The upper handle tube 441 is inserted into the lower handle tube 442. The quick-release locking ring 4431 is sleeved at the top end of the lower handle tube 442. The first anti-rotation screw 4433 abuts against the limiting groove 4411 by penetrating through the quick-release locking ring 4431. One end of the quick-release pull rod 4435 is connected with the quick-release compression screw 4432. The other end of the quick-release pull rod 4435 penetrates through two directional holes of the quick-release locking ring 4431 in sequence, penetrates through the wear-resistant gasket 4434, and is connected with the pull rod connecting shaft 4436. The pull rod connecting shaft 4436 is arranged at one end of the quick-release wrench 4437 through the second anti-rotation screw 4438. The tightness of the quick-release locking ring 4431 can be controlled by controlling the quick-release pull rod 4435. The connection between the upper handle tube 441 and the lower handle tube 442 can be clamped and fixed or loosened, so as to realize the storage of the upper handle tube 441 and the lower handle tube 442. After the handle tube 44 is stored, the overall length is basically the same as the length of the left handle 41, that is, the length of the right handle 42.

[0094] The lower handle tube 442 is further screwed with a lower tube connecting head 4421. The lower tube connecting head 4421 is provided with an inclined structure 4422 at the bottom. The inclined structure 4422 is provided with a connecting block. The connecting block is provided with an axle hole. The axle hole is used to movably connect the bicycle body. After the limiting sleeve of the lower fixed handle tube 44 is disassembled, the handlebar can be rotated to a position close to the front wheel 10 through the inclined structure 4422.

[0095] In one embodiment, one end of the left handle 41 is provided with a first connector 411. One end of the right handle 42 is provided with a second connector 421. The connecting connector 43 is provided with a first connecting port 431 and a second connecting port 432. The first connecting port 431 is provided with a first clamping position and a second clamping position. The second connecting port 432 is provided with a third clamping position and a fourth clamping position.

[0096] When unfolded, the first connector 411 is connected with the first connecting port 431 and clamped in the first clamping position. The second connector 421 is connected with the second connecting port 432 and clamped in the third clamping position. When folded, the first connector 411 is connected with the first connecting port 431 and clamped in the second clamping position. The second connector 421 is connected with the second connecting port 432 and clamped in the fourth clamping position.

[0097] In the embodiment, the left handle 41 is movably connected to the first connecting port 431, and the left handle 41 can rotate around the first connecting port 431 with the axis of the first connecting port 431 as the central axis; the right handle 42 is movably connected to the second connecting port 432, and the right handle 42 can rotate around the second connecting port 432 with the axis of the second connecting port 432 as the central axis.

[0098] The left handle 41 further comprises a first main rod 415 and a first connecting rod 416; the right handle 42 further comprises a second main rod 425 and a second connecting rod 426, one end of the first connecting rod 416 is connected to the first main rod 415, and the other end is connected to the first joint 411; one end of the second connecting rod 426 is connected to the second main rod 425, and the other end is connected to the second joint 421, the supplementary angle of the included angle between the first main rod 415 and the first connecting rod 416 is α1, the included angle between the first connecting rod 416 and the first joint 411 is β1, and the included angle between the axis of the first connecting port 431 and the head pipe 44 is γ1; the relationship among α1, β1 and γ1 satisfies: α1+β1+γ1=180°.

[0099] The supplementary angle of the included angle between the second main rod 425 and the second connecting rod 426 is α2, the included angle between the second connecting rod 426 and the second joint 421 is β2, and the included angle between the axis of the second connecting port 432 and the head pipe 44 is γ2; the relationship among α2, β2 and γ2 satisfies: α2+β2+γ2=180°, and on the side of the left handle 41, such arrangement can realize that the first main rod 415 is parallel to the head pipe 44 after folding, and on the side of the right handle 42, such arrangement can realize that the second main rod 425 is parallel to the head pipe 44 after folding.

[0100] The left handle 41 further comprises a first limiting ring 412, a first limiting screw 413 and a first spring 414; the right handle 42 further comprises a second limiting ring 422, a second limiting screw 423 and a second spring 424.

[0101] The side wall of the first joint 411 is provided with a pair of first openings 4111 passing through from one side to the opposite side, and the side wall of the second joint 421 is provided with a pair of second openings 4211 passing through from one side to the opposite side; the first clamping position is a pair of first limiting notches 4311 on the side wall of the first connecting port 431, the second clamping position is a pair of second limiting notches 4312 on the side wall of the first connecting port 431, the third clamping position is a pair of third limiting notches 4321 on the side wall of the second connecting port 432, and the fourth clamping position is a pair of fourth limiting notches 4322 on the side wall of the second connecting port 432.

[0102] The first limiting screw 413 is inserted from one side of the first limiting ring 412, passes through the first opening 4111 and is fixed to the other side of the first limiting ring 412, and the first limiting ring 412 is sleeved on the first joint 411. The first joint 411 is provided with a first limiting hook near the opening, and the first opening 4111 is provided away from the opening of the first joint 411. One end of the first spring 414 is connected to the first limiting hook, and the other end is connected to the first limiting screw 413. When the bicycle is unfolded, the first joint 411 is inserted into the first connecting port 431 for connection. When connected, the first limiting hook is located inside the first limiting gap 4311, that is, a pulling force is always generated to clamp the first limiting screw 413 on the first limiting gap 4311, preventing the first limiting screw 413 from being separated from the first limiting gap 4311. The first spring 414 always provides a spring force to the first limiting screw 413 to pull the first limiting screw 413 in the direction of the first limiting hook. The right handle 42 is similar, and will not be repeated here.

[0103] When the bicycle is unfolded, the first opening 4111 corresponds to the first limiting gap 4311, the first limiting ring 412 is clamped on the outside of the first connecting port 431, and the first limiting screw 413 is clamped on the first limiting gap 4311. The second opening 4211 corresponds to the third limiting gap 4321, the second limiting ring 422 is clamped on the outside of the second connecting port 432, and the second limiting screw 423 is clamped on the third limiting gap 4321. When the bicycle is folded, the first opening 4111 corresponds to the second limiting gap 4312, the first limiting ring 412 is clamped on the outside of the first connecting port 431, and the first limiting screw 413 is clamped on the second limiting gap 4312. The second opening 4211 corresponds to the fourth limiting gap 4322, the second limiting ring 422 is clamped on the outside of the second connecting port 432, and the second limiting screw 423 is clamped on the fourth limiting gap 4322.

[0104] Taking the left handle 41 as an example, the first opening 4111 is a pair of openings with the axis of the third joint 641 as the axis of symmetry, and the first limiting screw 413 can slide left and right in the first opening 4111. The first opening 4111 forms a sliding groove for the first limiting screw 413. By external force, for example, the user can pull the first limiting screw 413 left and right in the first opening 4111, so that the first limiting screw 413 can slide left and right in the first opening 4111. When it is necessary to fix the left handle 41 in the use state position, only need to insert the third joint 641 of the left handle 41 into the first connecting port 431 in the use state position, at this time, the side of the first opening 4111 close to the first limiting gap 4311 is aligned with the first limiting gap 4311, then pull the first limiting screw 413 to the first limiting gap 4311 for clamping, in this way, the left handle 41 is fixed, and the first limiting screw 413 can be connected with the first limiting gap 4311 through interference fit. When disassembling, only need to pull out the first limiting screw 413 from the first limiting gap 4311, the left handle 41 can be rotated and stored. The fixing of the right handle 42 in the folding state position is similar to the above principle, and will not be described again. Similarly, the fixing and dismounting principles of the right handle 42 in the use state position and the folding state position are similar to those of the left handle 41, and will not be described again. In addition, the first limiting gap 4311 and the second limiting gap 4312 can be arranged adjacent to each other, that is, the second limiting gap 4312 is beside the first limiting gap 4311. Specifically, as shown in Figure 8 , in combination with Figure 12 , in this case, when the left handle 41 is clamped in the use state position, the end held by the left handle 41 is slightly inclined to the front of the vehicle. When the overall vehicle is relatively small, the user naturally stretches his hand to the position of controlling the handlebar, which is beneficial to hand control and power generation, and the riding conforms to ergonomics.

[0105] Obviously, the above-described embodiments are only some embodiments of the present application, not all embodiments. The preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be implemented in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent replacements to some technical features. Any equivalent structure made by using the contents of the specification and drawings, directly or indirectly applied to other related technical fields, is also within the scope of the patent protection of the present application.

Claims

1. A folding bicycle, characterized in that, The utility model provides a folding bicycle, which comprises two front wheels, a transmission structure, a left handle, a right handle, a telescopic head tube, a frame and a rear wheel structure. The transmission structure is provided with an output shaft, a foldable left crank and a foldable right crank. The bottom end of the head tube is hingedly connected to the transmission structure, and the top end of the head tube is provided with a connecting joint. The left handle is foldably connected to one end of the connecting joint, and the right handle is foldably connected to the other end of the connecting joint. The rear wheel structure comprises a suspension frame provided with a foldable rear wheel.

2. The folding bicycle of claim 1, wherein When folded, the left handle and the right handle are folded to be parallel to the head tube, the head tube is retracted and folded in front of the two front wheels, the frame is folded behind the two front wheels and between the two front wheels, the rear wheel is parallel to the two front wheels, the left crank is located on the left side of the two front wheels and is parallel to the two front wheels as a whole, and the right crank is located on the right side of the two front wheels and is parallel to the two front wheels as a whole. The transmission structure is provided with the quick release switch. One end of the frame is connected to the transmission structure through a connecting shaft, and the end of the frame is further provided with a U-shaped opening. The two sides of the U-shaped opening are respectively provided with limiting protrusions, the two ends of the quick release switch are respectively provided with limiting nuts, and the inner side of the limiting nut is provided with an inner groove matched with the limiting protrusion.

3. The folding bicycle of claim 2, wherein, The quick release switch has two states of opening and closing. When the quick release switch is in the closed state, the inner groove is clamped with the limiting protrusion to limit the quick release switch in the U-shaped opening.

4. The folding bicycle of claim 1, wherein When the quick release switch is in the open state, the inner groove is separated from the limiting protrusion to separate the quick release switch from the U-shaped opening, and the frame can rotate around the connecting shaft.

5. The folding bicycle of claim 4, wherein, The transmission structure is further provided with a first lower limiting part and a second lower limiting part. The end of the first lower limiting part is provided with a first elastic block for limiting the left crank, and the end of the second lower limiting part is provided with a second elastic block for limiting the right crank. The transmission structure is provided with an input shaft, one end of the left crank is provided with a first joint pipe, the first joint pipe is provided with a first ratchet wheel, the left crank is connected to one end of the input shaft through the first ratchet wheel, one end of the right crank is provided with a second joint pipe, the second joint pipe is provided with a second ratchet wheel, and the right crank is connected to the other end of the input shaft through the second ratchet wheel. The transmission structure is further provided with a first upper limiting part and a second upper limiting part. The outer wall of the first joint pipe is provided with a first limiting block, and the outer wall of the second joint pipe is provided with a second limiting block. The first upper limiting part comprises a first torsion spring and a first limiting claw, the first limiting claw has a protruding first claw end, the first limiting claw is rotatably sleeved to the transmission structure, one end of the first torsion spring is clamped to the first limiting claw, the other end is clamped to the transmission structure, the first claw end is limited to the limiting position of the first limiting block, and rotating the first limiting claw can make the first claw end escape from the limiting position of the first limiting block; The second upper limiting part comprises a second torsion spring and a second limiting claw, the second limiting claw has a protruding second claw end, the second limiting claw is rotatably sleeved to the transmission structure, one end of the second torsion spring is clamped to the second limiting claw, the other end is clamped to the transmission structure, the second claw end is limited to the limiting position of the second limiting block, and rotating the second limiting claw can make the second claw end escape from the limiting position of the second limiting block.

6. The folding bicycle of claim 4, wherein, The input shaft is further connected with a third torsion spring and a fourth torsion spring, one end of the third torsion spring is connected with the transmission structure, the other end of the third torsion spring is connected with the left crank, one end of the fourth torsion spring is connected with the transmission structure, and the other end of the fourth torsion spring is connected with the right crank.

7. The folding bicycle of claim 1, wherein, The rear wheel structure further comprises a left wheel arm and a right wheel arm, the rear wheel comprises a left rear wheel and a right rear wheel, and the suspension frame has a left connecting port and a right connecting port; One end of the left wheel arm is connected with the left rear wheel, the other end is connected with the left connecting port, and the left wheel arm can be folded by rotating around the axis line of the left connecting port as a center axis; One end of the right wheel arm is connected with the right rear wheel, the other end is connected with the right connecting port, and the right wheel arm can be folded by rotating around the axis line of the right connecting port as a center axis.

8. The folding bicycle of claim 1, wherein, One end of the left crank is connected with a left pedal, and one end of the right crank is connected with a right pedal; The left pedal comprises a first anti-rotation assembly, a first connecting pipe and a first pedal, and the right pedal comprises a second anti-rotation assembly, a second connecting pipe and a second pedal; The first connecting pipe has a first interface and a second interface arranged perpendicularly, the first anti-rotation assembly is detachably clamped with the left crank, the first anti-rotation assembly penetrates into the first connecting pipe from the first interface and limits the first connecting pipe, and the first pedal is movably connected with the first connecting pipe through the second interface; The second connecting pipe has a third interface and a fourth interface arranged perpendicularly, the second anti-rotation assembly is detachably clamped with the right crank, the second anti-rotation assembly penetrates into the second connecting pipe from the third interface and limits the second connecting pipe, and the second pedal is movably connected with the second connecting pipe through the fourth interface.

9. The folding bicycle of claim 1, wherein, The handle tube comprises an upper handle tube and a lower handle tube, the upper handle tube and the lower handle tube are movably sleeved through quick release buckles, and the connecting joint is connected to the top end of the upper handle tube.

10. The folding bicycle of claim 9, wherein, One end of the left handle is provided with a first joint, one end of the right handle is provided with a second joint, the connecting joint has a first connecting port and a second connecting port, the first connecting port has a first clamping position and a second clamping position, the second connecting port has a third clamping position and a fourth clamping position. In the unfolded state, the first joint connects the first connecting port and is clamped in the first clamping position, and the second joint connects the second connecting port and is clamped in the third clamping position; in the folded state, the first joint connects the first connecting port and is clamped in the second clamping position, and the second joint connects the second connecting port and is clamped in the fourth clamping position.

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