A folding bicycle

Abstract

The application relates to the technical field of bicycles, in particular to a folding bicycle which comprises a driving mechanism, a left crank, a right crank, a left front wheel, a right front wheel, a left pedal, a right pedal, a frame, a damping mechanism, a quick-release switch and a rear wheel structure; one end of the driving mechanism is provided with a driving shaft, the other end is provided with a driven shaft, one end of the left crank and one end of the right crank are both installed on the two sides of the driving mechanism through the driving shaft, the left pedal is connected to the other end of the left crank, the right pedal is connected to the other end of the right crank, and the left front wheel and the right front wheel are installed on the two sides of the driving mechanism through the driven shaft; the driving mechanism is movably connected with the damping mechanism, one end of the damping mechanism is foldably connected with the frame through the quick-release switch, and the other end of the frame is connected with the rear wheel structure; and the bicycle can be conveniently folded through the quick-release switch, and is convenient to carry and store.

Description

TECHNICAL FIELD

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

[0002] The folding bicycle belongs to a category of bicycles, which can reduce the length of the bicycle by about 45%, and the whole vehicle can be placed in a folding bag or the trunk of a car after folding. At the same time, no external tools are needed during folding, and the bicycle can be folded and unfolded manually.

[0003] The folding bicycle on the market is mainly folded by folding the frame folding joint and the stand pipe folding joint of the folding bicycle, and the front and rear wheels are folded together. The folded bicycle is still thick and occupies a large space, which is not easy to store and carry, resulting in poor user experience. SUMMARY

[0004] The purpose of the present application is to provide a folding bicycle, which can be folded and stored conveniently by rotating the frame towards the driving mechanism and rotating the pedals towards the crank through the quick release switch, thereby further reducing the folding volume of the bicycle.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A folding bicycle comprises a driving mechanism, left and right cranks, left and right front wheels, left and right pedals, a frame, a damping mechanism, a quick release switch and a rear wheel structure.

[0007] One end of the driving mechanism is provided with a driving shaft, and the other end is provided with a driven shaft. One end of the left crank and one end of the right crank are both installed on both sides of the driving mechanism through the driving shaft. The left pedal is connected to the other end of the left crank, and the right pedal is connected to the other end of the right crank. The left and right front wheels are installed on both sides of the driving mechanism through the driven shaft.

[0008] The driving mechanism is movably connected with the damping mechanism, and one end of the damping mechanism is foldably connected with the frame through the quick release switch. The other end of the frame is connected with the rear wheel structure.

[0009] The rear wheel structure comprises left and right rear wheels.

[0010] The frame, left and right cranks, left and right rear wheels all have a folding state. In the folding state, the frame is located between the left and right front wheels, the left crank, left pedal and left rear wheel are respectively parallel to the left side of the left front wheel, and the right crank, right pedal and right rear wheel are respectively parallel to the right side of the right front wheel.

[0011] Preferably, the damping mechanism comprises a damper, a damper support and a first damping connecting rod;

[0012] The damper is arranged in the damper support, and has a movable end, and a first shaft hole is arranged on the top of the movable end. The first damping connecting rod is movably connected to the damper support through a bearing, and one end of the first damping connecting rod is movably connected to the first shaft hole, and the other end of the first damping connecting rod is movably connected to the driving mechanism through a bearing.

[0013] Preferably, the damping mechanism further comprises a second damping connecting rod;

[0014] One end of the second damping connecting rod is movably connected to the damper support through a bearing, and the other end of the second damping connecting rod is movably connected to the driving mechanism through a bearing.

[0015] Preferably, the first damping connecting rod comprises a first left damping connecting rod and a first right damping connecting rod, and the first left damping connecting rod and the first right damping connecting rod are arranged oppositely;

[0016] The damper support comprises a damper left support arm and a damper right support arm, and the damper left support arm and the damper right support arm are arranged oppositely. One end of the damper left support arm and one end of the damper right support arm are movably connected to the first left damping connecting rod and the first right damping connecting rod through bearings at symmetrical positions.

[0017] One end of the damper opposite to the movable end is provided with a second shaft hole, and a connecting shaft passes through the other end of the damper left support arm, the second shaft hole and the other end of the damper right support arm in sequence to movably connect the damper.

[0018] Preferably, the second damping connecting rod comprises a second left damping connecting rod and a second right damping connecting rod;

[0019] One end of the second left damping connecting rod is movably connected to the damper left support arm through a bearing, and the other end of the second left damping connecting rod is movably connected to the driving mechanism through a bearing;

[0020] One end of the second right damping connecting rod is movably connected to the damper right support arm through a bearing, and the other end of the second right damping connecting rod is movably connected to the driving mechanism through a bearing.

[0021] Preferably, the front end of the frame is provided with a U-shaped opening and a connecting hole, and the damping mechanism is respectively provided with a quick release switch detachably connected with the U-shaped opening and a connecting shaft rotatably connected with the connecting hole. When the quick release switch is released, the frame can rotate around the connecting shaft.

[0022] Both sides of the U-shaped opening are respectively provided with limiting protrusions, and the quick release switch comprises a screw rod, and both ends of the screw rod are respectively provided with limiting nuts. The inner side of the limiting nut is provided with an inner groove matched with the limiting protrusion.

[0023] The quick release switch has two states of opening and closing, and when in the closed state, the inner groove is clamped with the limiting protrusion, so that the quick release switch is limited in the U-shaped opening; when in the opened state, the inner groove is separated from the limiting protrusion, so that the screw rod is separated from the U-shaped opening.

[0024] Preferably, the quick release switch further comprises a locking rod and a return spring.

[0025] The locking rod is arranged at one end of the screw rod.

[0026] Both the return springs are sleeved on the screw rod, and one end of one of the return springs abuts against the left supporting arm of the shock absorber, and the other end abuts against the left limiting nut, and one end of the other return spring abuts against the right supporting arm of the shock absorber, and the other end abuts against the right limiting nut.

[0027] Preferably, the input end of the driving mechanism is a driving shaft arranged on the driving mechanism, the front end of the left crank is provided with a first ratchet wheel, the left crank is connected with the left end of the driving shaft through the first ratchet wheel, the front end of the right crank is provided with a second ratchet wheel, and the right crank is connected with the right end of the driving shaft through the second ratchet wheel.

[0028] The left side surface of the driving mechanism is provided with a first upper limiting portion, the first upper limiting portion is close to the left end of the driving shaft, and is used for limiting the upper limit position of rotation of the left crank.

[0029] The right side surface of the driving mechanism is provided with a second upper limiting portion, the second upper limiting portion is close to the right end of the driving shaft, and is used for limiting the upper limit position of rotation of the right crank.

[0030] The front end of the left crank is provided with a first connecting sleeve, the first connecting sleeve is sleeved on the first ratchet wheel, and the outer wall of the first connecting sleeve is provided with a first limiting block.

[0031] The first upper limiting portion 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 on the driving mechanism, one end of the first torsion spring is clamped with the first limiting claw, and the other end is clamped on the driving mechanism, so as to limit the first claw end to the 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.

[0032] The front end of the right crank is provided with a second connecting sleeve, the second connecting sleeve is sleeved on the second ratchet wheel, and the outer wall of the second connecting sleeve is provided with a second limiting block.

[0033] The second upper limit part comprises a second torsion spring and a second limit claw with a protruding second claw end, the second limit claw is rotatably sleeved on the driving mechanism, one end of the second torsion spring is clamped with the second limit claw, and the other end is clamped on the driving mechanism, 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 deviate from the limiting position of the second limit block;

[0034] The left end of the driving shaft is sleeved with a third torsion spring, one end of the third torsion spring is clamped with the first connecting sleeve, and the other end is clamped with the driving mechanism;

[0035] The right end of the driving shaft is sleeved with a fourth torsion spring, one end of the fourth torsion spring is clamped with the second connecting sleeve, and the other end is clamped with the driving mechanism.

[0036] Preferably, the rear end of the left crank is provided with a first connecting pipe, the first connecting pipe has a first interface and a second interface with axes perpendicular to each other, the first interface is sleeved with the left crank, and the second interface is connected with the left pedal, the left pedal can be folded around the rear end of the left crank;

[0037] The rear end of the right crank is provided with a second connecting pipe, the second connecting pipe has a third interface and a fourth interface with axes perpendicular to each other, the third interface is sleeved with the right crank, and the fourth interface is connected with the right pedal, the right pedal can be folded around the rear end of the right crank;

[0038] The first connecting pipe further comprises a first anti-rotation interface, the left crank further comprises a first anti-rotation assembly, the first anti-rotation assembly is detachably clamped with the left crank through the first anti-rotation interface, and the first connecting pipe is limited;

[0039] The second connecting pipe further comprises a second anti-rotation interface, the right crank further comprises a second anti-rotation assembly, the second anti-rotation assembly is detachably clamped with the right crank through the second anti-rotation interface, and the second connecting pipe is limited.

[0040] Preferably, the rear wheel structure further comprises a suspension frame, the middle part of the suspension frame is connected with the frame, one end of the suspension frame is connected with the left rear wheel, and the other end is connected with the right rear wheel;

[0041] The middle part of the suspension frame is provided with a connecting rod, and the connecting rod is rotatably connected to the rear end of the frame;

[0042] The left wheel arm is connected between the suspension frame and the left rear wheel, and the left wheel arm can rotate around the axis of the left end of the suspension frame;

[0043] The right wheel arm is connected between the suspension frame and the right rear wheel, and the right wheel arm can rotate around the axis of the right end of the suspension frame.

[0044] Compared with the prior art, the beneficial effects of the present application are:

[0045] The damping mechanism connected between the driving mechanism and the frame can reduce the impact of the road surface on the bicycle during driving, and improve comfort; the quick release switch connected between the damping mechanism and the frame can facilitate the rotation and folding of the frame towards the driving mechanism, and facilitate carrying and storage; the connecting pipe connected between the crank and the pedal can facilitate the rotation of the pedal towards the crank in the direction of approaching the crank, and further reduce the folding volume of the bicycle. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0047] Among them:

[0048] Figure 1 It is a structural schematic diagram of the folding bicycle in the embodiment;

[0049] Figure 2 It is an exploded structural schematic diagram of the folding bicycle in the embodiment;

[0050] Figure 3 It is a structural schematic diagram of the folding bicycle in the folded state in the embodiment;

[0051] Figure 4 It is an exploded structural schematic diagram of the folding bicycle in the folded state in the embodiment;

[0052] Figure 5 It is an exploded structural schematic diagram of the left crank and the left pedal of the folding bicycle in the embodiment;

[0053] Figure 6 It is a structural schematic diagram of the rear wheel of the folding bicycle in the embodiment;

[0054] Figure 7 It is an exploded structural schematic diagram of the first right damping connecting rod and bearing of the folding bicycle in the embodiment;

[0055] Figure 8 It is an exploded structural schematic diagram of the first upper limiting part of the folding bicycle in the embodiment.

[0056] In the drawings:

[0057] 10, drive mechanism; 11, left front wheel; 12, right front wheel; 13, drive shaft; 1310, first torsion spring; 1320, second torsion spring; 14, first upper limit portion; 1410, third torsion spring; 1420, first limit claw; 1430, first claw end; 15, second upper limit portion; 1510, fourth torsion spring; 1520, second limit claw; 1530, second claw end; 16, driven shaft;

[0058] 20, damping mechanism; 21, damper; 2110, first shaft hole; 2120, second shaft hole; 22, damper support; 2210, damper left support arm; 2220, damper right support arm; 2310, first damping connecting rod; 2311, first left damping connecting rod; 2312, first right damping connecting rod; 2320, second damping connecting rod; 2321, second left damping connecting rod; 2322, second right damping connecting rod; 24, quick release switch; 2410, screw rod; 2420, limit nut; 2421, inner groove; 2430, locking rod; 2440, return spring; 25, connecting shaft; 26, bearing; 2610, first insert sleeve; 2620, second insert sleeve; 2710, first lower limit portion; 2711, first elastic block; 2720, second lower limit portion; 2721, second elastic block;

[0059] 30, frame; 31, U-shaped opening; 32, connecting hole; 3110, limit protrusion; 31, U-shaped opening;

[0060] 41, left crank; 4110, first ratchet wheel; 4111, first tooth seat; 4112, first elastic piece; 4113, first ratchet tooth; 4114, first tooth sleeve; 4120, first connecting sleeve; 4130, first limit block; 4140, first connecting pipe; 4141, first interface; 4142, second interface; 4143, first anti-rotation interface; 4150, first anti-rotation assembly; 4151, elastic piece; 4152, first anti-rotation stopper; 4153, screw; 42, right crank; 4210, second ratchet wheel; 4211, second tooth seat; 4212, second elastic piece; 4213, second ratchet tooth; 4214, second tooth sleeve; 4220, second connecting sleeve; 4230, second limit block; 4240, second connecting pipe; 4241, third interface; 4242, fourth interface; 4243, second anti-rotation interface; 4250, second anti-rotation assembly;

[0061] 51, left pedal; 52, right pedal;

[0062] 60, rear wheel structure; 61, left rear wheel; 6110, left wheel arm; 6111, first wheel fork; 62, right rear wheel; 6210, right wheel arm; 6211, second wheel fork; 63, suspension bracket; 6310, connecting rod. DETAILED DESCRIPTION

[0063] 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 upon the application; the use herein of terms such as "comprise" and "comprising", and any variations such as "comprises" or "comprising", "including" and "including", and "include" and "including" and any variations thereof, is intended to cover the nature of the features, integers, components, and / or elements mentioned in connection with the embodiments described herein but does not preclude the addition of one or more other features, integers, components, elements, and / or any combinations thereof.

[0064] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from a whole class of comparable embodiments which those skilled in the art will readily appreciate. It is further understood that the descriptions and specific examples, while indicating preferred embodiments, are intended to be merely exemplary and are not intended to be exhaustive or limiting of the application.

[0065] 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 below in conjunction with the drawings.

[0066] As shown in the drawings, an embodiment provided by the present application is shown. Figures 1-8

[0067] The embodiment of the present application provides a folding bicycle, which comprises a driving mechanism 10, a left crank 41, a right crank 42, a left front wheel 11, a right front wheel 12, a left pedal 51, a right pedal 52, a frame 30, a damping mechanism 20, a quick release switch 24 and a rear wheel structure 60.

[0068] The driving mechanism 10 is provided with a driving shaft 13 at one end and a driven shaft 16 at the other end, one end of the left crank 41 and one end of the right crank 42 are both installed on the two sides of the driving mechanism 10 through the driving shaft 13, the left pedal 51 is connected to the other end of the left crank 41, the right pedal 52 is connected to the other end of the right crank 42, and the left front wheel 11 and the right front wheel 12 are installed on the two sides of the driving mechanism 10 through the driven shaft 16.

[0069] The driving mechanism 10 is movably connected with the damping mechanism 20, the damping mechanism 20 is foldably connected with one end of the frame 30 through the quick release switch 24, and the other end of the frame 30 is connected with the rear wheel structure 60.

[0070] The rear wheel structure 60 comprises a left rear wheel 61 and a right rear wheel 62.

[0071] ​The frame 30 and the left crank 41, the right crank 42, the left rear wheel 61 and the right rear wheel 62 have a folding state, in which the frame 30 is located between the left front wheel 11 and the right front wheel 12, and the left crank 41, the left pedal 51 and the left rear wheel 61 are parallel to the left side of the left front wheel 11, and the right crank 42, the right pedal 52 and the right rear wheel 62 are parallel to the right side of the right front wheel 12.

[0072] In the embodiment, the driving mechanism 10 is provided with a driving shaft 13 and a driven shaft 16, and the driving shaft 13 transmits power to the driven shaft 16. One end of the left crank 41 and one end of the right crank 42 are both installed on both sides of the driving mechanism 10 through the driving shaft 13, and the left front wheel 11 and the right front wheel 12 are installed on both sides of the driving mechanism 10 through the driven shaft 16, that is, the power obtained from the left crank 41 and the right crank 42 is transmitted to the driven shaft 16 through the driving shaft 13 to provide power for the left front wheel 11 and the right front wheel 12. The driving mechanism 10 and the damping mechanism 20 are movably installed, and when the left front wheel 11 or the right front wheel 12 vibrates, the vibration can be alleviated through the damping mechanism 20 to improve the riding comfort of the bicycle. One end of the damping mechanism 20 and the frame 30 are foldably connected through the quick release switch 24, and the other end of the frame 30 is connected with the rear wheel structure 60, so that the frame 30 can be quickly folded along the damping mechanism 20 to approach between the driving mechanism 10 and the left front wheel 11 and the right front wheel 12. Referring to FIG. 2, the frame 30 is connected with the damping mechanism 20 through the quick release switch 24, and the other end of the frame 30 is connected with the rear wheel structure 60, so that the frame 30 can be quickly folded along the damping mechanism 20 to approach between the driving mechanism 10 and the left front wheel 11 and the right front wheel 12. Figure 2 In the folding state, the frame 30 is located between the left front wheel 11 and the right front wheel 12, and the left crank 41, the left pedal 51 and the left rear wheel 61 are parallel to the left side of the left front wheel 11, and the right crank 42, the right pedal 52 and the right rear wheel 62 are parallel to the right side of the right front wheel 12, so that the folding state occupies a small space and is easy to store.

[0073] In one embodiment, the damping mechanism 20 includes a damper 21, a damper bracket 22 and a first damping connecting rod 2310.

[0074] The damper 21 is arranged in the damper bracket 22, and the damper 21 has a movable end, and the top of the movable end is provided with a first shaft hole 2110. The first damping connecting rod 2310 is movably connected to the damper bracket 22 through the bearing 26, one end of the first damping connecting rod 2310 is movably connected to the first shaft hole 2110, and the other end of the first damping connecting rod 2310 is movably connected to the driving mechanism 10 through the bearing 26.

[0075] In the embodiment, the shock absorber 21 is installed inside the shock absorber support 22, the movable end top of the shock absorber 21 is provided with a first shaft hole 2110, a first shock absorbing connecting rod 2310 is movably connected to the shock absorber support 22 through a bearing 26, one end of the first shock absorbing connecting rod 2310 is movably connected to the first shaft hole 2110, and the other end of the first shock absorbing connecting rod 2310 is movably connected to the driving mechanism 10 through the bearing 26, that is, the driving mechanism 10 can be connected to form a shock absorbing structure through the shock absorber support 22, the first shock absorbing connecting rod 2310 and the movable end of the shock absorber 21, the vibration on the driving mechanism 10 is relieved, and the comfort of the bicycle is improved. The above-mentioned bearing 26 includes a first bushing 2610 and a second bushing 2620, as shown in the attached Figure 6 The second bushing 2620 is sleeved in the first bushing 2610, and the first bushing 2610 and the second bushing 2620 can slide relative to each other, which reduces the wear of the first shock absorbing connecting rod 2310 during the shock absorbing process, and facilitates the maintenance of the shock absorbing effect by regularly replacing the first bushing 2610 or the second bushing 2620.

[0076] In one embodiment, the shock absorbing mechanism 20 further comprises a second shock absorbing connecting rod 2320.

[0077] One end of the second shock absorbing connecting rod 2320 is movably connected to the shock absorber support 22 through the bearing 26, and the other end of the second shock absorbing connecting rod 2320 is movably connected to the driving mechanism 10 through the bearing 26.

[0078] In the embodiment, one end of the second shock absorbing connecting rod 2320 is movably connected to the shock absorber support 22 through the bearing 26, and the other end of the second shock absorbing connecting rod 2320 is movably connected to the driving mechanism 10 through the bearing 26, as shown in the attached Figure 1 That is, the driving mechanism 10 is connected to form a shock absorbing structure composed of the first shock absorbing connecting rod 2310 and the second shock absorbing connecting rod 2320 with an included angle through the shock absorber support 22, the first shock absorbing connecting rod 2310, the second shock absorbing connecting rod 2320 and the shock absorber 21, which further enhances the shock absorbing effect on the driving mechanism 10.

[0079] In one embodiment, the first shock absorbing connecting rod 2310 includes a first left shock absorbing connecting rod 2311 and a first right shock absorbing connecting rod 2312, and the first left shock absorbing connecting rod 2311 and the first right shock absorbing connecting rod 2312 are oppositely arranged.

[0080] The shock absorber support 22 includes a shock absorber left support arm 2210 and a shock absorber right support arm 2220, and the shock absorber left support arm 2210 and the shock absorber right support arm 2220 are oppositely arranged, one end of the shock absorber left support arm 2210 and one end of the shock absorber right support arm 2220 are symmetrically connected to the first left shock absorbing connecting rod 2311 and the first right shock absorbing connecting rod 2312 at symmetrical positions through the bearing 26.

[0081] The second shaft hole 2120 is arranged at one end of the movable end of the shock absorber 21, and the shock absorber left arm 2210, the second shaft hole 2120 and the shock absorber right arm 2220 are movably connected by the connecting shaft 25.

[0082] In the embodiment, the first shock absorbing connecting rod 2310 is divided into a first left shock absorbing connecting rod 2311 and a first right shock absorbing connecting rod 2312, and the two are arranged oppositely; the shock absorber support 22 includes a shock absorber left arm 2210 and a shock absorber right arm 2220, and the two are arranged oppositely; one end of the shock absorber left arm 2210 and one end of the shock absorber right arm 2220 symmetrically arranged are connected to the first left shock absorbing connecting rod 2311 and the first right shock absorbing connecting rod 2312 at symmetric positions by the bearing 26, and the shock absorber left arm 2210 and the shock absorber right arm 2220 are movably connected to the first left shock absorbing connecting rod 2311 and the first right shock absorbing connecting rod 2312 at symmetric positions by the bearing 26. Figure 1 That is, one end of the shock absorber left arm 2210 is connected to the middle position of the first left shock absorbing connecting rod 2311 by the bearing 26, and symmetrically, one end of the shock absorber right arm 2220 is connected to the middle position of the first right shock absorbing connecting rod 2312 by the bearing 26. The first left shock absorbing connecting rod 2311 and the first right shock absorbing connecting rod 2312 are connected to the shock absorber 21 and the driving mechanism 10 on both sides respectively, so that the shock absorber 21 and the driving mechanism 10 can move up and down like a seesaw at the middle positions of the first left shock absorbing connecting rod 2311 and the first right shock absorbing connecting rod 2312, interact with each other, and make the vibration of the driving mechanism 10 be properly resolved by the shock absorber 21, so that the bicycle obtains certain comfort during driving. The second shaft hole 2120 is arranged at one end of the movable end of the shock absorber 21, and the shock absorber left arm 2210, the second shaft hole 2120 and the shock absorber right arm 2220 are movably connected by the connecting shaft 25. Figure 3 The connecting shaft 25 movably connects the shock absorber left arm 2210, the shock absorber right arm 2220, the shock absorber 21 and the frame 30 through the second shaft hole 2120 on the shock absorber 21 and the connecting hole 32, and connects the frame 30, the shock absorbing mechanism 20 and the driving mechanism 10.

[0083] In one embodiment, the second shock absorbing connecting rod 2320 includes a second left shock absorbing connecting rod 2321 and a second right shock absorbing connecting rod 2322.

[0084] One end of the second left shock absorbing connecting rod 2321 is connected to the shock absorber left arm 2210 by the bearing 26, and the other end is connected to the driving mechanism 10 by the bearing 26.

[0085] One end of the second right shock absorbing connecting rod 2322 is connected to the shock absorber right arm 2220 by the bearing 26, and the other end is connected to the driving mechanism 10 by the bearing 26.

[0086] In the embodiment, the second shock-absorbing connecting rod 2320 is divided into a second left shock-absorbing connecting rod 2321 and a second right shock-absorbing connecting rod 2322, one end of the second left shock-absorbing connecting rod 2321 is connected with the shock-absorber left support arm 2210 through a bearing 26, and the other end of the second left shock-absorbing connecting rod 2321 is connected with the driving mechanism 10 through a bearing 26; symmetrically, one end of the second right shock-absorbing connecting rod 2322 is connected with the shock-absorber right support arm 2220 through a bearing 26, and the other end of the second right shock-absorbing connecting rod 2322 is connected with the driving mechanism 10 through a bearing 26, forming a double-arm support structure of the second left shock-absorbing connecting rod 2321 and the second right shock-absorbing connecting rod 2322, so that the stress is more uniform during the vibration process, and the shock-absorbing stability is improved.

[0087] In one embodiment, the front end of the frame 30 is provided with a U-shaped opening 31 and a connecting hole 32, and the shock-absorbing mechanism 20 is respectively provided with a quick release switch 24 detachably connected with the U-shaped opening 31 and a connecting shaft 25 rotationally connected with the connecting hole 32, and the frame 30 can rotate around the connecting shaft 25 by releasing the quick release switch 24;

[0088] The two sides of the U-shaped opening 31 are respectively provided with limiting protrusions 3110, and the quick release switch 24 includes a screw rod 2410, the two ends of the screw rod 2410 are respectively provided with limiting nuts 2420, and the inner side of the limiting nut 2420 is provided with an inner recess 2421 matched with the limiting protrusion 3110;

[0089] The quick release switch 24 has two states of opening and closing, in the closed state, the inner recess 2421 is clamped with the limiting protrusion 3110, so that the quick release switch 24 is limited in the U-shaped opening 31; in the open state, the inner recess 2421 is separated from the limiting protrusion 3110, so that the screw rod 2410 is separated from the U-shaped opening 31.

[0090] In the embodiment, reference is made to the accompanying Figure 3, the outer shell of the damping mechanism 20 and the connecting hole 32 of the frame 30 are rotationally connected through the connecting shaft 25, the quick release switch 24 is arranged on the outer shell of the damping mechanism 20, the U-shaped opening 31 on the frame 30 can be clamped on the screw rod 2410 for fixing, the screw rod 2410 has a function similar to that of a fixing pin, and the rotation connection between the damping mechanism 20 and the frame 30 can be changed into fixed connection. Conversely, the U-shaped opening 31 is separated from the screw rod 2410, so that the rotation connection is changed into a rotation connection state again. When the folding bicycle needs to be folded, the limiting nuts 2420 at the two ends of the screw rod 2410 on the quick release switch 24 are loosened, at this time, the inner recess 2421 on the inner side of the limiting nut 2420 is separated from the limiting protrusion 3110 in the U-shaped opening 31 on the outer side of the U-shaped opening 31, the U-shaped opening 31 is no longer limited by the inner recess 2421, and the U-shaped opening 31 can be separated from the screw rod 2410, so that only the connecting shaft 25 is connected between the damping mechanism 20 and the frame 30, to realize rotation folding. Correspondingly, when in use, the limiting nuts 2420 at the two ends of the screw rod 2410 on the quick release switch 24 are locked, so that the inner recess 2421 of the limiting nut 2420 is clamped with the limiting protrusion 3110 of the U-shaped opening 31, and the U-shaped opening 31 is clamped on the screw rod 2410 to realize the fixing function.

[0091] In one embodiment, the left end of the connecting shaft 25 is connected with a first lower limiting portion 2710 for limiting the lower limit position of rotation of the left crank 41, and the end of the first lower limiting portion 2710 is provided with a first elastic block 2711, which abuts against the left crank 41 when the left crank 41 is located at the lower limit position of rotation.

[0092] The right end of the connecting shaft 25 is connected with a second lower limiting portion 2720 for limiting the lower limit position of rotation of the right crank 42, and the end of the second lower limiting portion 2720 is provided with a second elastic block 2721, which abuts against the right crank 42 when the right crank 42 is located at the lower limit position of rotation.

[0093] In the embodiment, unlike the traditional pedal type bicycle, the left and right cranks continuously complete a circular motion during use, but the left crank 41 and the right crank 42 of the folding bicycle described above make a curve motion alternately up and down, so that during the downward movement of the crank of the bicycle, in order to prevent the crank from continuously making a circular motion, the movement amplitude is too large to make the user difficult to grasp the balance, and therefore it is necessary to set a lower limiting portion to limit it. When the user needs to rest, the lower limiting portion can also support the crank. Specifically, the front ends of the left crank 41 and the right crank 42 are respectively connected to the two sides of the driving mechanism 10 and located at positions close to the upper end of the driving mechanism 10, and the connecting shaft 25 is located at a position close to the lower end of the driving mechanism 10. Figure 3 and Figure 4For example, the left crank 41 and the first lower limit portion 2710, the right crank 42 and the second lower limit portion 2720 are similar, when the left crank 41 abuts against the first lower limit portion 2710, the left crank 41 is at its lower limit position of rotation, at this time, the first lower limit portion 2710 is as close as possible to the middle part of the left crank 41, avoiding that the force arm is too long when the left crank 41 is under stress, causing the pressure at the connection between the first lower limit portion 2710 or the left crank 41 and the driving mechanism 10 to be too large, if the material strength of the left crank 41 or the driving mechanism 10 is not enough, the risk of breakage is easy to occur. In addition, the first elastic block 2711 is arranged at the end of the first lower limit portion 2710, which can form a buffering effect when the left crank 41 abuts against the first lower limit portion 2710, which can not only protect the left crank 41, but also facilitate standing riding, and the first elastic block 2711 with elasticity can play a certain shock-absorbing effect.

[0094] In one embodiment, the quick release switch 24 further comprises a locking rod 2430 and a return spring 2440;

[0095] The locking rod 2430 is arranged at one end of the screw rod 2410;

[0096] The two return springs 2440 are sleeved on the screw rod 2410, and one end of one of the return springs 2440 abuts against the shock absorber left arm 2210, and the other end abuts against the left limiting nut 2420, and one end of the other return spring 2440 abuts against the shock absorber right arm 2220, and the other end abuts against the right limiting nut 2420.

[0097] In this embodiment, one end of the screw rod 2410 on the quick release switch 24 is provided with the locking rod 2430, the quick release of the screw rod 2410 and the U-shaped opening 31 can be realized by pulling the locking rod 2430, for one of the limiting nuts 2420 close to the locking rod 2430, an arc part can be arranged, so that the locking rod 2430 is not easy to loosen in the locked state due to vibration. On both sides of the screw rod 2410 between the limiting nut 2420 and the shock absorber bracket 22, a return spring 2440 is sleeved, which facilitates the quick opening of the limiting nut 2420 when the locking rod 2430 is released, releases the limiting state of the inner groove 2421 and the limiting protrusion 3110, and realizes the quick folding.

[0098] In one embodiment, the input end of the driving mechanism 10 is the driving shaft 13 arranged on the driving mechanism 10, the front end of the left crank 41 is provided with the first ratchet 4110, the left crank 41 is connected to the left end of the driving shaft 13 through the first ratchet 4110, the front end of the right crank 42 is provided with the second ratchet 4210, and the right crank 42 is connected to the right end of the driving shaft 13 through the second ratchet 4210;

[0099] The left side of the driving mechanism 10 is provided with a first upper limit portion 14, which is close to the left end of the driving shaft 13, and is used for limiting the upper limit position of the rotation of the left crank 41;

[0100] The right side of the driving mechanism 10 is provided with a second upper limit portion 15, which is close to the right end of the driving shaft 13, and is used for limiting the upper limit position of the rotation of the right crank 42;

[0101] The front end of the left crank 41 is provided with a first connecting sleeve 4120, which is sleeved on the first ratchet wheel 4110, and the outer wall of the first connecting sleeve 4120 is provided with a first limiting block 4130;

[0102] The first upper limit portion 14 includes a third torsion spring 1410 and a first limiting claw 1420, which has a protruding first claw end 1430, and the first limiting claw 1420 is rotatably sleeved on the driving mechanism 10, one end of the third torsion spring 1410 is clamped with the first limiting claw 1420, and the other end is clamped on the driving mechanism 10, limiting the first claw end 1430 to the limiting position of the first limiting block 4130, and rotating the first limiting claw 1420 can make the first claw end 1430 away from the limiting position of the first limiting block 4130;

[0103] The front end of the right crank 42 is provided with a second connecting sleeve 4220, which is sleeved on the second ratchet wheel 4210, and the outer wall of the second connecting sleeve 4220 is provided with a second limiting block 4230;

[0104] The second upper limit portion 15 includes a fourth torsion spring 1510 and a second limiting claw 1520, which has a protruding second claw end 1530, and the second limiting claw 1520 is rotatably sleeved on the driving mechanism 10, one end of the fourth torsion spring 1510 is clamped with the second limiting claw 1520, and the other end is clamped on the driving mechanism 10, limiting the second claw end 1530 to the limiting position of the second limiting block 4230, and rotating the second limiting claw 1520 can make the second claw end 1530 away from the limiting position of the second limiting block 4230;

[0105] The left end of the driving shaft 13 is sleeved with a first torsion spring 1310, one end of the first torsion spring 1310 is clamped with the first connecting sleeve 4120, and the other end is clamped with the driving mechanism 10;

[0106] The right end of the driving shaft 13 is sleeved with a second torsion spring 1320, one end of the second torsion spring 1320 is clamped with the second connecting sleeve 4220, and the other end is clamped with the driving mechanism 10.

[0107] In this embodiment, the two ends of the drive shaft 13 are connected to the left crank 41 and the right crank 42, respectively, transmitting the power from the two cranks to the drive mechanism 10 connected in the middle, which then drives the left front wheel 11 and the right front wheel 12 to rotate. The first ratchet 4110 and the second ratchet 4210 can only rotate in one direction. (Refer to the attached diagram.) Figure 4 Taking the first ratchet 4110 as an example, the second ratchet 4210 is similar. The first ratchet 4110 includes a first tooth seat 4111, a first spring 4112, a first ratchet 4113, and a first tooth sleeve 4114. The second ratchet 4210 includes a second tooth seat 4211, a second spring 4212, a second ratchet 4213, and a second tooth sleeve 4214. The first ratchet 4110 achieves unidirectional rotation of the left crank 41 by the first tooth sleeve 4114 configured inside the front end of the left crank 41 and engaging with the first tooth seat 4111 at the left end of the drive shaft 13. That is, the first ratchet 4113 is engaged with the first tooth seat 4111, and one end of the first spring 4112 abuts against the first ratchet 4113 and the other end abuts against the first tooth seat 4111, so that the first ratchet 4113 meshes with the first tooth sleeve 4114 to achieve unidirectional locking. In practical use, when the left crank 41 moves from top to bottom, the left crank 41 and the drive shaft 13 are locked. The left crank 41 drives the drive shaft 13 to rotate, and the drive shaft 13 drives the driven shaft 16 to achieve power input. When the left crank 41 moves from bottom to top, the left crank 41 and the drive shaft 13 are unlocked. The left crank 41 returns to its original position while the drive shaft 13 does not rotate. That is, the movement from bottom to top is the idle stroke of the left crank 41. It is worth mentioning that the number of the first spring plate 4112 and the first ratchet 4113 can be set as needed, and can be one, two, three, etc.

[0108] Furthermore, taking an example where the origin of the coordinate system is located on the drive shaft 13 and the X-axis points towards the front of the folding bicycle, the lower limit positions of the left crank 41 and the right crank 42 can be set at an angle of 180 degrees to 240 degrees with the horizontal plane. When riding, the user pedals within a range of approximately 100 degrees, such as between 135 degrees and 225 degrees, ensuring that the pedaling is always within the most efficient angle range. The up-and-down reset also saves a lot of idle travel compared to a 360-degree circular motion. In this case, the cranks of this folding bicycle can be made longer than those of a regular bicycle. According to the lever principle, the longer the lever arm, the less effort is required. However, the length of a regular bicycle is limited because the crank works in a circular motion and the crank must not hit the ground. In addition, this up-and-down pedaling is more suitable for standing riding, thus making full use of the rider's own weight, making riding easier. Standing riding is also more ergonomic. Combining these three points, this pedaling system is more than 50% more efficient than a regular bicycle.

[0109] Taking the left crank 41 as an example, the right crank 42 is similar, the front end of the left crank 41, i.e. the end of the left crank 41 connected with the driving shaft 13, is a hollow tubular first connecting sleeve 4120 sleeved on the first ratchet 4110, the inner wall of the first connecting sleeve 4120 is provided with a toothed structure capable of cooperating with the first toothed sleeve 4114, the first claw end 1430 of the first limiting claw 1420 abuts against the outer surface of the first connecting sleeve 4120, and the first limiting block 4130 abuts against the first claw end 1430 of the first limiting claw 1420 as the first connecting sleeve 4120 rotates upward, the first limiting claw 1430 limits the first limiting block 4130, and the first limiting claw 1430 is provided with a first claw end 1430 abutting against the first limiting block 4130. Figure 7 The first upper limiting part 14 includes a third torsional spring 1410, one end of the third torsional spring 1410 is clamped on the first limiting claw 1420, and the other end is clamped on the shell of the driving mechanism 10, when the first limiting claw 1420 is rotated, the third torsional spring 1410 is twisted to generate elastic potential energy, and after the first limiting claw 1420 is released, the third torsional spring 1410 drives the first limiting claw 1420 to return to the original position. When it is necessary to fold the folding bicycle, the first limiting claw 1420 can be rotated upward to make the first claw end 1430 away from the rotating path of the first limiting block 4130, so that the first limiting claw 1420 can no longer block the first limiting block 4130, and then the left crank 41 can be rotated upward and forward to the side of the front left wheel 11 without obstruction.

[0110] In order to make the left crank 41 and the right crank 42 automatically reset upward after the downward work is completed, the two ends of the driving shaft 13 are respectively provided with a first torsional spring 1310 and a second torsional spring 1320 corresponding to the driving shaft 13, and taking one side of the left crank 41 as an example, when the left crank 41 is pedaled downward, the first torsional spring 1310 is rotated and twisted, at this time, the first torsional spring 1310 continuously accumulates elastic potential energy, when the user changes the center of gravity and pedals the right crank 42, the left crank 41 is not subjected to downward force, at this time, the elastic potential energy of the first torsional spring 1310 is released, the left crank 41 is rotated upward to return to the original position, and the user can conveniently pedal back and forth for riding.

[0111] In one embodiment, the rear end of the left crank 41 is provided with a first connecting pipe 4140, the first connecting pipe 4140 has a first interface 4141 and a second interface 4142 with axes perpendicular to each other, the first interface 4141 is sleeved on the left crank 41, and the second interface 4142 is connected with the left pedal 51, the left pedal 51 can be folded around the rear end of the left crank 41;

[0112] The rear end of the right crank 42 is provided with a second connecting pipe 4240, the second connecting pipe 4240 has a third interface 4241 and a fourth interface 4242 with axes perpendicular to each other, the third interface 4241 is sleeved on the right crank 42, and the fourth interface 4242 is connected with the right pedal 52, the right pedal 52 can be folded around the rear end of the right crank 42;

[0113] The first connecting pipe 4140 further comprises a first anti-rotation interface 4143, and the left crank 41 further comprises a first anti-rotation assembly 4150 which is detachably connected with the left crank 41 through the first anti-rotation interface 4143 and limits the first connecting pipe 4140;

[0114] The second connecting pipe 4240 further comprises a second anti-rotation interface 4243, and the right crank 42 further comprises a second anti-rotation assembly 4250 which is detachably connected with the right crank 42 through the second anti-rotation interface 4243 and limits the second connecting pipe 4240.

[0115] In the embodiment, reference is made to the accompanying drawings Figure 4 Taking the first connecting pipe 4140 as an example, the second connecting pipe 4240 is similar, the first connecting pipe 4140 is a T-shaped or L-shaped connecting pipe, the two end pipe orifices of the first connecting pipe 4140 are perpendicular to each other, one end of the first connecting pipe 4140 is sleeved on the rear end of the left crank 41, and the first connecting pipe 4140 can rotate about the axis of the rear end of the left crank 41, and the other end of the first connecting pipe 4140 is connected to one end of the left pedal 51, and the left pedal 51 as a whole can rotate about the axis of the rear end of the left crank 41. When the folding bicycle is folded, rotating the first connecting pipe 4140 upward by 90° can make the left pedal 51 parallelly abut against the left side of the front wheel 11. In addition, in order to form support for the feet of the user when the left pedal 51 is used, a mechanism for preventing the first connecting pipe 4140 from rotating is further arranged on the first connecting pipe 4140. The first anti-rotation assembly 4150 is a component with a circumferential limiting structure or a combination of several components, which is composed of a spring piece 4151, a first anti-rotation stopper 4152 and a screw 4153, wherein the inner side of the first anti-rotation stopper 4152 is provided with an inwardly protruding quadrangular protrusion, and the end face of the end of the left crank 41 is provided with a quadrangular groove, the first anti-rotation stopper 4152 is fixed to the end of the left crank 41 by the screw 4153 through the circumferential clamping of the quadrangular protrusion and the quadrangular groove, so that the first anti-rotation stopper 4152 cannot rotate circumferentially, and at this time, the spring piece 4151 is clamped between the first anti-rotation stopper 4152 and the first connecting pipe 4140 to increase the rotating friction of the first connecting pipe 4140, that is, only when the left pedal 51 is pulled very hard, can the left pedal 51 rotate. The end of the first connecting pipe 4140 and the left crank 41 can also be provided with clamping blocks matched with each other, that is, the inner side wall of the first connecting pipe 4140 and the outer side wall of the end of the left crank 41 are provided with clamping blocks matched with each other, so as to limit the left pedal 51 when it is folded outward to a position parallel to the horizontal plane. The side of the second connecting pipe 4240 is similar to the first connecting pipe 4140, and will not be repeated here.

[0116] In one embodiment, the rear wheel structure 60 further comprises a suspension frame 63, the middle of the suspension frame 63 is connected to the frame 30, one end of the suspension frame 63 is connected to the left rear wheel 61, and the other end is connected to the right rear wheel 62;

[0117] The middle of the suspension frame 63 is provided with a connecting rod 6310, which is rotatably connected to the rear end of the frame 30;

[0118] The suspension frame 63 is connected to the left rear wheel 61 through a left wheel arm 6110, which can rotate around the axis of the left end of the suspension frame 63;

[0119] The suspension frame 63 is connected to the right rear wheel 62 through a right wheel arm 6210, which can rotate around the axis of the right end of the suspension frame 63.

[0120] In this embodiment, reference is made to the accompanying drawings Figure 5 The suspension frame 63 can be a one-piece part or formed by welding and splicing several parts, and can be a "V" shape or a "T" shape. The connecting rod 6310 is connected to the frame 30 through a rotating shaft, and at this time the connecting rod 6310 has the function of guiding the steering of the left and right rear wheels. It is worth mentioning that the left and right ends of the suspension frame 63 are slightly inclined upward, and the end of the left wheel arm 6110 connected to the left rear wheel 61 is slightly inclined downward. The right wheel arm 6210 has a similar structure to the left wheel arm 6110. After connection, when the left and right rear wheels 61 and 62 are in the use state position, the left and right rear wheels 61 and 62 are in the shape of an outer "eight", and at this time the left and right rear wheels 61 and 62 are below the suspension frame 63. When the left and right rear wheels 61 and 62 are in the folded state position, the left and right rear wheels 61 and 62 are in parallel, and at this time the left and right rear wheels 61 and 62 are in front of the suspension frame 63. The above-mentioned use state position and folded state position refer to two different fixed positions of the left and right rear wheels 61 and 62. After folding, the two wheels are in parallel, the overall structure is tightened, the occupied space is reduced, and they can be used as support wheels. In addition, the end of the left wheel arm 6110 connected to the left rear wheel 61 is provided with a first wheel fork 6111, and the left rear wheel 61 is connected to the first wheel fork 6111 through a wheel shaft and a screw. The end of the right wheel arm 6210 connected to the right rear wheel 62 is provided with a second wheel fork 6211, and the right rear wheel 62 is connected to the second wheel fork 6211 through a wheel shaft and a screw.

[0121] Obviously, the above-described embodiments are only some embodiments but not all the embodiments of the present application, 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 therein. Any equivalent structure made by using the content of the specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A folding bicycle, characterized in that, Includes drive mechanism, left crank, right crank, left front wheel, right front wheel, left pedal, right pedal, frame, shock absorption mechanism, quick-release switch and rear wheel structure; The drive mechanism has a drive shaft at one end and a driven shaft at the other end. One end of the left crank and one end of the right crank are both mounted on both sides of the drive mechanism via the drive shaft. The left pedal is connected to the other end of the left crank, and the right pedal is connected to the other end of the right crank. The left front wheel and the right front wheel are mounted on both sides of the drive mechanism via the driven shaft. The drive mechanism is movably connected to the shock absorption mechanism. The shock absorption mechanism is foldably connected to one end of the frame via a quick-release switch, and the other end of the frame is connected to the rear wheel structure. The rear wheel structure includes a left rear wheel and a right rear wheel; The frame, left crank, right crank, left rear wheel, and right rear wheel are all in a folded state. In the folded state, the frame is located between the left front wheel and the right front wheel. The left crank, left pedal, and left rear wheel are parallel to the left side of the left front wheel, and the right crank, right pedal, and right rear wheel are parallel to the right side of the right front wheel.

2. A folding bicycle according to claim 1, characterized in that, The damping mechanism includes a damper, a damper bracket, and a first damping linkage; The shock absorber is installed inside the shock absorber bracket. The shock absorber has a movable end, and the top of the movable end is provided with a first shaft hole. The first shock absorber connecting rod is movably connected to the shock absorber bracket through a bearing. One end of the first shock absorber connecting rod is movably connected to the first shaft hole, and the other end is movably connected to the drive mechanism through a bearing.

3. A folding bicycle according to claim 2, characterized in that, The damping mechanism also includes a second damping linkage; One end of the second damping link is movably connected to the damper bracket via a bearing, and the other end of the second damping link is movably connected to the drive mechanism via a bearing.

4. A folding bicycle according to claim 2, characterized in that, The first damping link includes a first left damping link and a first right damping link, which are arranged opposite to each other; The shock absorber bracket includes a left shock absorber arm and a right shock absorber arm, which are arranged opposite to each other. One end of the left shock absorber arm and the symmetrical end of the right shock absorber arm are connected to the first left shock absorber link and the first right shock absorber link at symmetrical positions via bearings. The shock absorber has a second shaft hole at one end relative to the movable end, and is movably connected by a connecting shaft that passes through the other end of the left support arm of the shock absorber, the second shaft hole, and the other end of the right support arm of the shock absorber in sequence.

5. A folding bicycle according to claim 3, characterized in that, The second damping link includes a second left damping link and a second right damping link; One end of the second left shock absorber linkage is connected to the left support arm of the shock absorber via a bearing, and the other end is connected to the drive mechanism via a bearing. One end of the second right shock absorber linkage is connected to the right support arm of the shock absorber via a bearing, and the other end is connected to the drive mechanism via a bearing.

6. A folding bicycle according to claim 1, characterized in that, The front end of the frame is provided with a U-shaped opening and a connecting hole. The shock absorption mechanism is provided with a quick-release switch that is detachably connected to the U-shaped opening and a connecting shaft that is rotatably connected to the connecting hole. Releasing the quick-release switch allows the frame to rotate around the connecting shaft. The U-shaped opening has limiting protrusions on both sides. The quick-release switch includes a screw with limiting nuts at both ends. The inner side of the limiting nuts has an inner groove that matches the limiting protrusions. The quick-release switch has two states: open and closed. In the closed state, the inner groove engages with the limiting protrusion, which can confine the quick-release switch within the U-shaped opening. In the open state, the inner groove separates from the limiting protrusion, which can separate the screw from the U-shaped opening.

7. A folding bicycle according to claim 6, characterized in that, The quick-release switch also includes a locking lever and a return spring; The locking rod is located at one end of the screw; Both return springs are sleeved on the screw, with one end of one return spring abutting the left support arm of the shock absorber and the other end abutting the left limiting nut, and one end of the other return spring abutting the right support arm of the shock absorber and the other end abutting the right limiting nut.

8. A folding bicycle according to claim 1, characterized in that, The input end of the drive mechanism is a drive shaft. A first ratchet is provided at the front end of the left crank, and the left crank is connected to the left end of the drive shaft through the first ratchet. A second ratchet is provided at the front end of the right crank, and the right crank is connected to the right end of the drive shaft through the second ratchet. The left side of the drive mechanism is provided with a first upper limit part, which is close to the left end of the drive shaft and is used to limit the upper limit position of the rotation of the left crank. The right side of the drive mechanism is provided with a second upper limit stop, which is close to the right end of the drive shaft and is used to limit the upper limit position of the rotation of the right crank. The front end of the left crank is provided with a first connecting sleeve, which is sleeved on the first ratchet, and a first limiting block is provided on the outer wall of the first connecting sleeve; The first upper limit part includes 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 on the drive mechanism. One end of the first torsion spring is engaged with the first limiting claw, and the other end is engaged with the drive mechanism, limiting the first claw end to the limiting position of the first limiting block. Rotating the first limiting claw can cause the first claw end to disengage from the limiting position of the first limiting block. The front end of the right crank is provided with a second connecting sleeve, which is sleeved on the second ratchet, and a second limiting block is provided on the outer wall of the second connecting sleeve; The second upper limit part includes 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 on the drive mechanism. One end of the second torsion spring is engaged with the second limiting claw, and the other end is engaged with the drive mechanism, limiting the second claw end to the limiting position of the second limiting block. Rotating the second limiting claw can cause the second claw end to disengage from the limiting position of the second limiting block. A third torsion spring is fitted on the left end of the drive shaft. One end of the third torsion spring is engaged with the first connecting sleeve, and the other end is engaged with the drive mechanism. A fourth torsion spring is fitted on the right end of the drive shaft. One end of the fourth torsion spring is engaged with the second connecting sleeve, and the other end is engaged with the drive mechanism.

9. A folding bicycle according to claim 1, characterized in that, The left crank is provided with a first connecting tube at its rear end. The first connecting tube has a first interface and a second interface with their axes perpendicular to each other. The first interface is sleeved on the left crank, and the second interface is connected to the left pedal. The left pedal can be folded around the rear end of the left crank. The rear end of the right crank is provided with a second connecting tube. The second connecting tube has a third interface and a fourth interface with mutually perpendicular axes. The third interface is sleeved on the right crank, and the fourth interface is connected to the right pedal. The right pedal can be folded around the rear end of the right crank. The first connecting tube further includes a first anti-rotation interface, and the left crank further includes a first anti-rotation component. The first anti-rotation component passes through the first anti-rotation interface and is detachably snapped into the left crank, and limits the first connecting tube. The second connecting tube also includes a second anti-rotation interface, and the right crank also includes a second anti-rotation component. The second anti-rotation component passes through the second anti-rotation interface and is detachably snapped into the right crank, thereby limiting the position of the second connecting tube.

10. A folding bicycle according to claim 1, characterized in that, The rear wheel structure also includes a suspension frame, the middle of which is connected to the vehicle frame, one end of which is connected to the left rear wheel and the other end of which is connected to the right rear wheel; The suspension frame has a connecting rod in the middle, and the connecting rod is rotatably connected to the rear end of the vehicle frame; A left wheel arm is connected between the suspension frame and the left rear wheel, and the left wheel arm can rotate around the axis of the left end of the suspension frame; A right wheel arm is connected between the suspension frame and the right rear wheel, and the right wheel arm can rotate around the axis at the right end of the suspension frame.

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