Folding bicycle

Abstract

The embodiment of the invention discloses a folding bicycle which comprises a bicycle head pipe, a front wheel structure, a bicycle frame, a telescopic saddle structure and a rear wheel structure. The front wheel structure comprises a front wheel, a front fork and a connecting frame, the connecting frame comprises a supporting pipe and a connecting part, the connecting part is arranged on the side wall of the supporting pipe, the rear wheel structure comprises a rear wheel and a transmission assembly, the output end of the transmission assembly is connected with the rear wheel, and the input end of the transmission assembly is connected with a folding pedal. The saddle structure comprises a saddle and a telescopic pipe, and the bottom end of the telescopic pipe is connected with the transmission assembly through a locking structure. During folding, the telescopic pipe shrinks, the saddle moves to the front side of the rear wheel, the front wheel structure is folded to one side of the bicycle frame, the rear wheel structure is folded to the other side of the bicycle frame, and the bicycle head pipe is folded to one side of the front wheel structure and is integrally parallel to the front wheel structure.

Description

Technical Field

[0001] The invention relates to the technical field of bicycles, in particular to a folding bicycle. Background Art

[0002] The existing folding bicycles on the market usually only fold the frame part, so that the front wheel and the rear wheel are close to each other and on the same plane. Although this folding method is simple, the bicycle as a whole still occupies a large volume after folding. Some bicycles fold the front wheel and the rear wheel to a parallel state, so that the overall volume of the folded bicycle is smaller than the above folding bicycles, but this folding method is usually used on bicycles with larger wheels. The transmission ratio of such bicycles is not high, the transmission efficiency is low, and the volume after folding is still large due to the influence of the large wheels. In addition, this folding method requires professional tools, and the disassembly and assembly process is too complicated and inconvenient to use. Summary of the invention

[0003] In view of this, the present invention provides a folding bicycle, which is used to solve the problem that the folding bicycle in the prior art cannot have both small volume after folding and convenient assembly and disassembly.

[0004] To achieve one or part or all of the above purposes or other purposes, the present application provides a folding bicycle, including a head tube, a front wheel structure, a frame, a retractable seat structure and a rear wheel structure;

[0005] The front wheel structure comprises a front wheel, a front fork and a connecting frame, the connecting frame comprises a support tube and a connecting portion, the connecting portion is fixedly arranged on the side wall of the support tube and communicated with the support tube, the support tube is sleeved on one end of the front fork, the other end of the front fork is rotatably connected to the front wheel, and the connecting portion is hinged to one end of the frame;

[0006] The rear wheel structure includes a rear wheel and a transmission assembly, wherein the output end of the transmission assembly is connected to the rear wheel, and the seat structure includes a seat and a telescopic tube, wherein the top end of the telescopic tube is connected to the seat, and the bottom end is connected to the transmission assembly via a locking structure;

[0007] The transmission assembly has a first hinged end and a first clamping end spaced apart from each other on a side away from the rear wheel, and the frame has a second hinged end and a second clamping end spaced apart from each other on a side close to the transmission assembly, the first hinged end is hinged to the second hinged end, and the first clamping end is detachably connected to the second clamping end;

[0008] When folding, the telescopic tube contracts, the seat moves to the front side of the rear wheel, the front wheel structure is folded to one side of the frame, the rear wheel structure is folded to the other side of the frame, and the head tube is folded to one side of the front wheel structure and is parallel to the front wheel structure as a whole.

[0009] Furthermore, a limiting hole is provided on a side wall at one end of the frame, a first rotating shaft is provided in the limiting hole and a first limiting member is rotatably connected to the limiting hole via the first rotating shaft, a first accommodating groove is provided on the connecting frame, and the first limiting member has a first position located inside the first accommodating groove and a second position separated from the first accommodating groove;

[0010] The frame is also provided with a first hinge, which is spaced apart from the limiting hole, and the frame is hinged to the connecting frame via the first hinge.

[0011] Further, the first limiting member includes a mounting portion and a rotating portion, the first rotating shaft is passed through the mounting portion, when the first limiting member is located at the first position, the first rotating shaft abuts against the first receiving groove, the rotating portion limits the frame, and a first torsion spring is provided on the first rotating shaft, one end of the first torsion spring abuts the mounting portion against the first receiving groove, and the other end of the first torsion spring abuts against the frame.

[0012] Furthermore, a first clamping block is rotatably connected to the frame via a screw, and the first clamping block has a first position and a second position for radially limiting the rotating part. When the first clamping block is located at the second position, the rotating part can rotate radially.

[0013] Furthermore, a folding assembly and a second hinge are provided on the frame at intervals, the folding assembly has a first position in a supporting state and a second position out of the supporting state, and when the folding assembly is in the second position, the frame can rotate relative to the transmission assembly through the second hinge;

[0014] The transmission assembly further comprises a housing, a first connecting piece is disposed on the housing, and the support tube is detachably connected to the first connecting piece.

[0015] Furthermore, an L-shaped connecting block is provided at one end of the support tube, the first connecting piece is a groove-shaped structure, and the connecting block penetrates into the first connecting piece;

[0016] One end of the connection block is connected to a limit pin, and the limit pin has a connection end and a movable end. The connection end of the limit pin passes through the connection block and is connected to a positioning block. The positioning block is located inside the first connection member and abuts the connection block against the first connection member.

[0017] Furthermore, an elastic member is provided on the limit pin, one end of the elastic member abuts against the connecting end of the limit pin, and the other end of the elastic member abuts against the connecting block.

[0018] Further, the head tube includes a stand pipe, a third hinge is provided at one end of the connecting frame, a second connecting member is provided inside the connecting frame, and the stand pipe is hinged to the second connecting member through the third hinge;

[0019] The second connecting member is a groove-shaped structure, with a mounting platform at its upper end, the mounting platform is hinged with a connecting buckle through a connecting shaft, a connecting plate is provided inside the lower end of the riser corresponding to the connecting buckle, a locking buckle capable of being clamped with the connecting plate is provided at the free end of the connecting buckle, a third torsion spring is sleeved on the connecting shaft, and the third torsion spring is respectively connected to the mounting platform and the connecting buckle;

[0020] The stand pipe has a first position for fitting with the connecting frame and a second position for being detached from the connecting frame. When the stand pipe is in the first position, the lock is engaged with the connecting plate. When the stand pipe is in the second position, the lock is detached from the connecting plate.

[0021] Further, a mounting hole is provided on the side wall of the stand pipe, and the unlocking assembly includes a button, a return spring and an unlocking rod;

[0022] The button can be slidably installed on the mounting hole, a connecting rod is provided on the inner side of the button, the return spring is sleeved on the connecting rod, one end of the unlocking rod extends into the mounting hole and is coaxially fixed with the connecting rod, the other end of the unlocking rod can be abutted against the lock buckle, and pressing the button can push the unlocking rod to move and push the lock buckle to detach from the connecting plate.

[0023] Furthermore, the third hinged member includes a third hinge portion and a third hinge axis, and an angle between a vertical plane where a line perpendicular to the third hinge axis is located and a vertical plane where a line connecting the front wheel and the rear wheel is located is 45°.

[0024] Implementing the embodiments of the present invention will have the following beneficial effects:

[0025] After adopting the above-mentioned folding bicycle, the head tube is folded to a position parallel to the front wheel structure, the front wheel structure is folded to be parallel to the frame, the support tube and the transmission assembly on the frame are disassembled, the transmission assembly and the rear wheel are folded to a position parallel to the frame, and then the locking structure is opened and the seat structure is retracted, so that the overall volume occupied by the bicycle after folding is smaller. At the same time, the structure adopted by each folding part is simple and easy to operate, and no additional tools are required to assist in disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] in:

[0028] Figure 1 A schematic structural diagram of an embodiment of the foldable bicycle proposed in the present application in a supporting state;

[0029] Figure 2 A schematic diagram of the structure of an embodiment of the foldable bicycle proposed in the present application in a folded state;

[0030] Figure 3 A schematic structural diagram of an embodiment of the foldable bicycle proposed in the present application in a folded state from another perspective;

[0031] Figure 4 A bottom view of an embodiment of the foldable bicycle proposed in the present application in a folded state;

[0032] Figure 5 This is a schematic diagram of the exploded structure of a bracket and a connecting frame in one embodiment of the folding bicycle proposed in this application;

[0033] Figure 6 This is a schematic structural diagram of a first position-limiting member of an embodiment of a folding bicycle proposed in this application;

[0034] Figure 7 A partial schematic diagram of the frame and other structures of an embodiment of the folding bicycle proposed in this application;

[0035] Figure 8 A schematic diagram of a connecting frame and other structures of an embodiment of a folding bicycle proposed in this application;

[0036] Fig. 9 This is an exploded structural diagram of a frame and a transmission assembly of an embodiment of a folding bicycle proposed in the present application;

[0037] Fig.10 A schematic diagram of a transmission assembly and a seat structure of a folding bicycle according to an embodiment of the present application;

[0038] Fig.11 A partial schematic diagram of the frame and other structures of an embodiment of the folding bicycle proposed in this application;

[0039] Fig.12 This is an exploded structural diagram of a frame and other structures of an embodiment of a folding bicycle proposed in this application;

[0040] Fig.13 This is a schematic structural diagram of a positioning block of an embodiment of a folding bicycle proposed in this application;

[0041] Fig.14 A schematic structural diagram of a second connecting member of an embodiment of the folding bicycle proposed in this application;

[0042] Fig.15 A partial schematic diagram of a seat tube of an embodiment of a folding bicycle proposed in the present application;

[0043] Fig.16 This is a cross-sectional view of the structure of the seat tube and the connecting frame of an embodiment of the folding bicycle proposed in the present application;

[0044] Fig.17 This is a schematic diagram of an exploded structure of a stand pipe and a second connecting member and other structures of an embodiment of a folding bicycle proposed in the present application;

[0045] Fig.18 This is a schematic diagram of the structure of a seat tube and other components of an embodiment of a folding bicycle proposed in this application;

[0046] Fig.19 This is a schematic diagram of the exploded structure of the folding pedal of an embodiment of the folding bicycle proposed in the present application;

[0047] Fig. 20 A schematic diagram of the structure of a sleeve in one embodiment of the folding bicycle proposed in this application;

[0048] Fig.21 A cross-sectional view of the overall structure of a folding pedal in one embodiment of the folding bicycle proposed in the present application;

[0049] Fig. 22 A schematic diagram of the structure of a pedal in one embodiment of the folding bicycle proposed in this application;

[0050] Fig.23 This is a schematic diagram of the structure of a guide tube in one embodiment of the folding bicycle proposed in this application.

[0051] Reference numerals:

[0052] 1. Head tube; 11. Stand tube; 12. Third hinge; 13. Connecting plate; 14. Unlocking assembly; 141. Button; 1411. Connecting rod; 142. Return spring; 143. Unlocking rod; 15. Mounting hole; 16. Reinforcement rib;

[0053] 2. frame; 21. support tube; 211. connection block; 212. stop pin; 2121. connection end; 2122. movable end; 213. positioning block; 214. projection; 215. first connection hole; 217. elastic member; 22. stop hole; 23. first rotating shaft; 231. first torsion spring; 24. first stop member; 241. mounting portion; 2411. through hole; 242. rotating portion; 243. stop block; 2431. first guide groove; 25. first hinged member; 251. first hinged portion; 252. first hinged shaft; 26. second guide groove; 27. first clamping block; 28. second hinged member; 291. second stop member; 292. second clamping block;

[0054] 3. Seat structure; 31. Telescopic tube; 32. Connecting ring; 33. Locking rod; 34. Locking buckle; 35. Connecting cap; 36. Seat;

[0055] 5. front wheel; 51. front fork; 52. connecting frame; 521. first receiving groove; 5211. opening; 522. hinged platform; 523. second connecting member; 5231. mounting platform; 5232. connecting shaft; 5233. connecting buckle; 5234. locking buckle; 5235. third torsion spring; 5236. buckling wall; 5237. connecting platform; 5238. third position-limiting member; 53. supporting tube; 54. connecting part;

[0056] 6. Transmission assembly; 61. Second accommodating groove; 62. Housing; 621. First connecting member; 622. Second connecting hole;

[0057] 7. Rear wheel;

[0058] 8. Folding footrest; 81. Crank; 82. Pedal; 10. Connecting column; 101. Limiting hole; 20. Connecting tube; 30. Guide tube; 300. Mounting through hole; 50. Limiting mechanism; 501. Ball; 502. Sleeve; 503. Fixed ring; 504. Avoiding groove; 505. Limiting pin; 506. Reset spring; 507. Ring step; 40. Movable rod; 401. Limiting groove; 402. Guide groove. DETAILED DESCRIPTION

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0062] Reference Figures 1 to 23 , the present application proposes a folding bicycle, comprising a head tube 1, a front wheel structure, a frame 2, a retractable seat structure 3, a rear wheel structure and a folding pedal 8;

[0063] The front wheel structure includes a front wheel 5, a front fork 51 and a connecting frame 52. The connecting frame 52 includes a support tube 53 and a connecting portion 54. The connecting portion 54 is fixedly arranged on the side wall of the support tube 53 and communicated with the support tube 53. The support tube 53 is sleeved on one end of the front fork 51. The other end of the front fork 51 is rotatably connected to the front wheel 5. The connecting portion 54 is hinged to one end of the frame 2.

[0064] The rear wheel structure includes a rear wheel 7 and a transmission assembly 6, the output end of the transmission assembly 6 is connected to the rear wheel 71, the input end of the transmission assembly 6 is connected to the folding footrest 8, the seat structure 3 includes a seat 36 and a telescopic tube 31, the top end of the telescopic tube 31 is connected to the seat 36, and the bottom end is connected to the transmission assembly 6 through a locking structure;

[0065] The transmission assembly 6 has a first hinged end and a first clamping end spaced apart from each other on a side away from the rear wheel 7, and the frame 2 has a second hinged end and a second clamping end spaced apart from each other on a side close to the transmission assembly 6, the first hinged end is hinged to the second hinged end, and the first clamping end is detachably connected to the second clamping end;

[0066] When folding, the telescopic tube 31 shrinks, the seat 36 moves to the front side of the rear wheel 7, the front wheel structure is folded to one side of the frame 2, the rear wheel structure is folded to the other side of the frame 2, the head tube 1 is folded to one side of the front wheel structure and is parallel to the front wheel structure as a whole, and the folding footrest 8 is folded to be parallel to the frame 2 as a whole. Figure 2 and Figure 3 After folding, the overall longitudinal cross-sectional area of ​​the bicycle is slightly larger than the longitudinal cross-sectional area of ​​the front wheel 5. When equipped with a transmission assembly 6 with a relatively high transmission ratio, the front wheel 5 and the rear wheel 7 of the bicycle can both adopt small diameter wheels. In this way, the overall volume of the bicycle after folding is smaller, which is convenient for packing or placing in a trunk, and is simple and portable.

[0067] In this embodiment, refer to Fig.10 The locking structure includes a connecting ring 32, a locking rod 33 and a locking buckle 34. The connecting ring 32 is sleeved on the telescopic tube 31 of the seat structure 3. The two ends of the connecting ring 32 are provided with connecting protrusions 214 respectively. The locking rod 33 passes through the two connecting protrusions 214, one end is connected to the locking buckle 34, and the other end is connected to the connecting cap 35. When there is no need to adjust the height of the seat structure 3, for example, when the bicycle is in a supporting state or a folded state, the locking buckle 34 locks the telescopic tube 31 so that it will not move. When the height of the seat structure 3 needs to be adjusted, the locking buckle 34 is opened, and the telescopic tube 31 is extended and retracted under the action of external force. After the height is adjusted, the locking buckle 34 is locked. When the bicycle is in a folded state, the telescopic tube 31 can be retracted to the shortest and the locking buckle 34 is locked to reduce the overall volume of the bicycle after folding.

[0068] In addition, for the specific folding method of the frame 2 and the front wheel structure, refer to Figures 5 to 8 As shown, a limiting hole 22 is provided on the side wall of one end of the frame 2, a first rotating shaft 23 is provided in the limiting hole 22, and a first limiting member 24 is rotatably connected to the limiting hole 22 through the first rotating shaft 23, a first accommodating groove 521 is provided on the connecting portion 54, the first limiting member 24 has a first position located inside the first accommodating groove 521 and a second position separated from the first accommodating groove 521, a first hinge 25 is provided at a position opposite to the limiting hole 22 on the frame 2, the frame 2 is hinged to the connecting portion 54 through the first hinge 25, and the first hinge 25 includes a first hinge portion 251 and a first hinge portion 251 provided therein The first hinge shaft 252 in the first hinged part 251, the connecting part 54 is provided with two hinge platforms 522 at intervals at a position opposite to the first accommodating groove 521, and the two ends of the first hinge shaft 252 are respectively rotatably connected to a hinge platform 522. When the first limit member 24 is in the second position, the frame 2 can rotate relative to the connecting part 54 together with the first hinge shaft 252; it can be understood that the first hinge member 25 can also be arranged on the connecting part 54, and the hinge platform 522 is arranged on the frame 2, so that the frame 2 can rotate relative to the connecting part 54.

[0069] In addition, refer to Figure 6The first limiting member 24 includes a mounting portion 241 and a rotating portion 242. The first rotating shaft 23 is passed through the mounting portion 241. When the first limiting member 24 is located at the first position, the first rotating shaft 23 abuts against the first receiving groove 521, and the rotating portion 242 limits the frame 2. A first torsion spring 231 is provided on the first rotating shaft 23. One end of the first torsion spring 231 abuts the mounting portion 241 against the first receiving groove 521, and the other end of the first torsion spring 231 abuts against the frame 2. Specifically, an opening 5211 is provided on the bottom wall of the first receiving groove 521, and a stopper 243 is provided on the mounting portion 241. The stopper 243 passes through the opening 5211 and is located inside the connecting frame 52. A first guide groove 2431 is provided on the stopper 243. One end of the first torsion spring 231 is located in the first guide groove 2431, and the side wall of the stopper 243 abuts against the inner wall of the connecting frame 52, thereby fixing the stopper 243. A through hole 2411 having a cross-shaped longitudinal section is provided on the mounting portion 241, and the first rotating shaft 23 passes through the through hole 2411. The length of the first rotating shaft 23 matches the height of the first receiving groove 521. One end of the first rotating shaft 23 abuts against one side wall of the first receiving groove 521, and the other end abuts against the other side wall of the first receiving groove 521, so that the position of the first rotating shaft 23 will not be offset due to the movement of the bicycle. In addition, the first torsion spring 231 is arranged inside the through hole 2411 and is sleeved on the first rotating shaft 23. A second guide groove 26 is also provided on the inner wall of the frame 2. The other end of the first torsion spring 231 is located in the second guide groove 26. The first guide groove 2431 and the second guide groove 26 prevent the position of the first torsion spring 231 from being offset longitudinally. When the bicycle needs to be restored from a folded state to a supported state, the first torsion spring 231 is installed in the first guide groove 2431, which can be quickly positioned and is easy to install.

[0070] When the bicycle needs to be folded, the user pulls the rotating part 242. The rotating part 242 has a certain curvature, so that there is a distance between one end thereof and the outer wall of the frame 2, which is convenient for the user to pull. At this time, the rotating part 242 drives the mounting part 241 to rotate relative to the first rotating shaft 23. The first torsion spring 231 is subjected to external force, and one end thereof rotates together with the limit block 243. The side wall of the limit block 243 is out of contact with the inner wall of the connecting part 54. At this time, the user applies an outward force to the rotating part 242, so that the first limit member 24, the first rotating shaft 23 and the first torsion spring 231 are out of contact with the first accommodating groove 521 together. The frame 2 and one end of the connecting frame 52 are disassembled. Through the first hinge 25, the frame 2 and the connecting part 54 can rotate relative to each other. The connecting frame 52, the front fork 51 and the front wheel 5 rotate to one side of the frame 2 and are parallel to the frame 2.

[0071] In another embodiment, referring to Figure 5The frame 2 is rotatably connected with a first clamping block 27 by means of a screw. The first clamping block 27 has a first position and a second position for radially limiting the rotating portion 242. When the first clamping block 27 is located at the second position, the rotating portion 242 can rotate radially. The first clamping block 27 is arranged on one side of the rotating portion 242. When the first clamping block 27 is located at the first position, a part of the rotating portion 242 is located between the first clamping block 27 and the outer wall of the frame 2, so as to prevent the rotating portion 242 from rotating radially when the bicycle is running normally. When the user needs to fold the bicycle, the first clamping block 27 is rotated to the second position to leave the rotating path of the rotating portion 242, and then the front wheel structure is folded.

[0072] The folding method of the frame 2 and the transmission assembly 6 is shown in Figures 9 to 13 As shown, after the user disassembles the first clamping end and the second clamping end, the first hinged end and the second hinged end are relatively rotated, so that the frame 2 and the rear wheel structure can be folded. Specifically, in the present embodiment, a support tube 21 is provided on the frame 2, one end of the support tube 21 is connected to the middle part of the frame 2, and the other end is a second clamping end, which is used to be detachably connected to the transmission assembly 6. The second hinged end includes a folding assembly and a second hinge 28 arranged at intervals. The folding assembly has a first position in a supporting state and a second position out of the supporting state. When the folding assembly is in the second position, the frame 2 can be rotated relative to the transmission assembly 6 through the second hinge 28; the connection method between the other end of the frame 2 and the transmission assembly is similar to the connection method between one end of the frame 2 and the connecting frame 52 mentioned above. Similarly, after the folding assembly is disassembled, the frame 2 and the transmission assembly 6 are relatively rotated through the second hinge 28. The structure of the second hinge 28 is similar to the structure of the first hinge 25 mentioned above. The folding assembly includes a second limit member 291, a second rotating shaft and a second torsion spring. A second accommodating groove 61 is provided on the first hinged end of the transmission assembly 6. The assembly and connection relationship thereof are similar to the assembly and connection relationship between the first limit member 24, the first rotating shaft 23, the first torsion spring 231 and the first accommodating groove 521 mentioned above. Similarly, the folding assembly can also be set on the transmission assembly 6, and the second accommodating groove 61 can be set on the frame 2, or a second clamping block 292 similar to the first clamping block 27 can be set on the frame 2. The implementation method and working principle thereof are similar to the above description and will not be repeated here.

[0073] In addition, the first clamping end of the transmission assembly 6 includes a housing 62, on which a first connecting member 621 is provided, and the support tube 21 is detachably connected to the first connecting member 621. After the support tube 21 is detached from the first connecting member 621, the transmission assembly 6 and the rear wheel 7 are folded by the folding assembly and the second hinge 28. Specifically, an L-shaped connecting block 211 is provided at one end of the support tube 21, and the first connecting member 621 is a groove-shaped structure, and the connecting block 211 penetrates into the first connecting member 621; the opening of the first connecting member 621 can be on the left side, or on the right side, on the upper side or on the lower side, or openings are provided on both the left and right sides or on the upper and lower sides, and the connecting block 211 penetrates into the first connecting member 621 through the opening, and one end of the connecting block 211 is connected to a limiting pin 212, and the limiting pin 212 has a connecting end 2121 and a movable end 2122. After the connecting end 2121 of the limiting pin 212 passes through the connecting block 211, it is connected to a positioning block 213, and the positioning block 213 is located inside the first connecting member 621, and the connecting block 211 abuts against the first connecting member 621.

[0074] Specifically, the limit pin 212 can be a bolt or a latch, and can also be arranged around the connecting block 211. Fig.12 Taking the embodiment shown in the figure as an example, the limit pin 212 is located on one side of the connecting block 211, and the movable end 2122 of the limit pin 212 and the positioning block 213 clamp the connecting block 211 in the middle, and the end of the positioning block 213 away from the limit pin 212 is provided with a protrusion 214, and the connecting block 211 is provided with a first connecting hole 215 corresponding to the protrusion 214, and the groove wall of the first connecting member 621 is located between the connecting block 211 and the supporting tube 21,

[0075] A second connecting hole 622 is provided on the groove wall of the first connecting member 621. When the support tube 21 is connected to the first connecting member 621, the protrusion 214 is inserted into the first connecting hole 215 and partially penetrates into the second connecting hole 622, so that the connecting block 211 abuts against the first connecting member 621, and the connecting block 211 and the first connecting member 621 are limited radially.

[0076] In addition, an elastic member 217 is provided on the limit pin 212, one end of the elastic member 217 abuts against the connection end 2121 of the limit pin 212, and the other end abuts against the connection block 211. When the bicycle is in a supported state, the bicycle will be affected by the road conditions and vibrate during driving, affecting the stability of the limit pin 212. The elastic member 217 can generate a force pointing to the connection end 2121 of the limit pin 212. When the limit pin 212 tends to move toward the direction close to the positioning block 213, the elastic member 217 can generate a reaction force on the connection end 2121 of the limit pin 212 to restore it to its original position, thereby avoiding affecting the normal driving of the bicycle. When the user wants to disassemble the bicycle, the limit pin 212 is pressed toward the positioning block 213, the elastic member 217 contracts, the user overcomes the elastic force, the movable end 2122 of the limit pin 212 approaches the connecting block 211, the positioning block 213 moves therewith, and the protrusion 214 is disengaged from between the first connecting hole 215 and the second connecting hole 622, so that the positioning block 213 and the connecting block 211 can be pulled out from the first connecting member 621. In order to allow the protrusion 214 to completely disengage from the first connecting hole 215 and the second connecting hole 622, the moving distance of the limit pin 212 is greater than the length of the protrusion 214. In addition, in this embodiment, the direction in which the connecting block 211 is pulled out is consistent with the rotation direction of the frame 2 when the bicycle is folded, so that the operation is more convenient when disassembling and installing the frame 2 and the transmission assembly 6, and the design is more reasonable.

[0077] Further, the folding method of the head tube refers to Figures 14 to 18 As shown, the head tube 1 includes a stand pipe 11, a third hinge 12 is provided at one end of a connecting frame 52, a second connecting member 523 is provided inside the connecting frame 52, and the stand pipe 11 is hinged to the second connecting member 523 through the third hinge 12;

[0078] The second connecting member 523 is a groove-shaped structure, and a mounting platform 5231 is provided at its upper end. The mounting platform 5231 is hinged with a connecting buckle 5233 through a connecting shaft 5232. A connecting plate 13 is provided inside the lower end of the vertical pipe 11 corresponding to the connecting buckle 5233. A locking buckle 5234 capable of being engaged with the connecting plate 13 is provided at the free end of the connecting buckle 5233. A third torsion spring 5235 is sleeved on the connecting shaft 5232. The third torsion spring 5235 is respectively connected to the mounting platform 5231 and the connecting buckle 5233.

[0079] The stand pipe 11 has a first position in contact with the connecting frame 52 and a second position detached from the connecting frame 52 . When the stand pipe 11 is in the first position, the lock buckle 5234 is engaged with the connecting plate 13 . When the stand pipe 11 is in the second position, the lock buckle 5234 is detached from the connecting plate 13 .

[0080] Specifically, the mounting platform 5231 and the third hinge 12 are spaced apart from each other at the upper end of the second connecting member 523. The upper end surface of the second connecting member 523 is a concave structure. The mounting platform 5231 is opened at one end of the concave structure. The third hinge 12 is opened outside the concave structure. The concave structure and the inner cavity of the vertical pipe 11 form a cavity for the connecting buckle 5233 to rotate. The third hinge 12 of this embodiment includes a third hinge part 121 and a third hinge shaft 122. Its structure is similar to that of the above-mentioned first hinge 25, which can enable the vertical pipe 11 and the second connecting member 523 to flip relative to each other.

[0081] In addition, refer to Fig.16 The angle between the vertical plane where the line perpendicular to the third hinge axis 122 is located and the vertical plane where the line connecting the front wheel 5 and the rear wheel 7 is located is 45°, so that after the bicycle is folded, the seat tube 11 and the handlebars can be located on the side of the front wheel 5, and the whole is parallel to the plane where the central axis of the frame 2 is located after folding, further reducing the volume occupied by the bicycle after folding.

[0082] When the seat tube 11 is in the second position, the outer wall of the seat tube 11 can be attached to the outer wall of the front fork 51 to achieve the folding operation of the front part of the bicycle; when the seat tube 11 is in the first position, the seat tube 11 is coaxially connected to the connecting frame 52, and the upper end wall of the second connecting member 523 covers the lower end opening of the seat tube 11. At this time, the upper half of the mounting platform 5231 is placed in the seat tube 11. In order to enable the seat tube 11 to maintain the first position for a long time and stably, and ensure that the user can stably grasp the front of the bicycle, the present embodiment installs the connecting member 5231 at the mounting platform 5231. The connecting buckle 5233 and the third torsion spring 5235 for fastening and resetting the connecting buckle 5233. Specifically, the lower end of the lock buckle 5234 forms a fastening wall 5236, which is fitted with the upper end wall of the connecting plate 13 through the fastening wall 5236, and the connecting buckle 5233 always has a rotation tendency to fasten to the connecting plate 13 through the third torsion spring 5235. One or more third torsion springs 5235 can be set on the connecting shaft 5232 to increase the fastening force of the connecting buckle 5233, thereby improving the fastening effect of the vertical pipe 11 when it is in the first position.

[0083] Specifically, refer to Fig.17 The mounting platform 5231 includes two connecting platforms 5237 and a third limiting member 5238 alternately spaced apart, and the hinged end of the connecting buckle 5233 is hinged between the two connecting platforms 5237 through the connecting shaft 5232; the third limiting member 5238 is mounted on the two connecting platforms 5237, and the third limiting member 5238 includes a mounting plate and a baffle, and the two ends of the mounting plate are respectively fitted and fixed on the upper ends of the two connecting platforms 5237, and the baffle can abut against the side wall of the connecting buckle 5233 and limit the rotation angle of the connecting buckle 5233, one end of the torsion spring is hooked on the mounting plate, and the other end of the torsion spring is hooked on a side wall of the connecting buckle 5233 away from the baffle.

[0084] In addition, refer to Fig.14 and Fig.15 , an inclined guide wall is provided at the upper end of the lock buckle 5234, and both ends of the guide wall are chamfered, a reinforcing rib 16 is provided between the lower side wall of the connecting plate 13 and the inner wall of the vertical pipe 11, and the side wall of the reinforcing rib 16 facing the lower end opening of the vertical pipe 11 can fit with the guide wall, and when the vertical pipe 11 is switched from the second position to the first position, the lock buckle 5234 can be forced to rotate in the direction away from the third limiter 5238 through the fit of the reinforcing rib 16 and the guide wall. Specifically, the reinforcing rib 16 can both strengthen the connection The strength of the connecting plate 13 ensures that the connecting plate 13 is not easily deformed or broken even when the lock buckle 5234 is repeatedly pressed. The upper end wall of the connecting plate 13 can also be quickly fitted and fastened with the locking wall 5236 of the lock buckle 5234 through the reinforcing rib 16. It should also be noted that the two ends of the reinforcing rib 16 are seamlessly connected to the end of the connecting plate 13 and the open end of the vertical pipe 11 respectively, and chamfered corners are provided to improve the smoothness of the vertical pipe 11 when it is flipped from the second position to the first position.

[0085] Reference Fig.16 In order to facilitate the user to release the limit of the connecting buckle 5233 on the vertical pipe 11 and realize the folding and flipping of the vertical pipe 11, an unlocking component 14 is installed on the side wall of the vertical pipe 11. The unlocking component 14 is pressed against or pulled against the lock buckle 5234, so that one end of the lock buckle 5234 of the connecting buckle 5233 is rotated in a direction away from the connecting plate 13. When the lock buckle 5234 is completely separated from the connecting plate 13, the vertical pipe 11 can be flipped and folded. Specifically, a mounting hole 15 is provided on the side wall of the vertical pipe 11, and the unlocking assembly 14 includes a button 141, a return spring 142 and an unlocking rod 143; the button 141 can be slidably installed in the mounting hole 15, and a connecting rod 1411 is provided on the inner side of the button 141, and the return spring 142 is sleeved on the connecting rod 1411. One end of the unlocking rod 143 extends into the mounting hole 15 and is coaxially fixed with the connecting rod 1411, and the other end of the unlocking rod 143 can be abutted against the lock buckle 5234. Pressing the button 141 can push the unlocking rod 143 to move and push the lock buckle 5234 to detach from the connecting plate 13.

[0086] Reference Fig.17The aperture of the mounting hole 15 is slightly larger than the outer diameter of the button 141, so that when the button 141 is axially displaced in the mounting hole 15, the bottom wall of the mounting hole 15 is provided with a through hole 2411 smaller than its aperture. The button 141 adopts a T-shaped structure, and the reset spring 142 can be installed through the connecting rod 1411, and it is convenient to connect the unlocking rod 143. The unlocking rod 143 adopts a T-bolt, one end of the T-bolt penetrates into the interior of the connecting rod 1411 and is threadedly fixed with the connecting rod 1411, and the other end of the T-bolt abuts against the lock buckle 5234. The T-bolt can also limit the button 141 and the reset spring 142 in the mounting hole 15 to prevent the button 141 from detaching from the mounting hole 15; in this embodiment, the axial movement distance of the button 141 in the mounting hole 15 is greater than the width of the connecting plate 13 to ensure that the unlocking rod 143 can completely push the lock buckle 5234 away from the connecting plate 13. It should also be noted that the return spring 142 of the present embodiment adopts a conical helical spring. The conical helical spring can be effectively limited in length or space. Through the telescoping ability of the conical helical spring, it can store more energy than a cylindrical spring while occupying a smaller space, thereby reducing the space occupied by the unlocking component 14 and improving the structural compactness of the riser 11 and the connecting frame 52.

[0087] In this embodiment, the input end of the transmission assembly 6 is connected to the folding pedal 8 of the bicycle, and the output end thereof is connected to the rear wheel 7 of the bicycle. The transmission assembly 6 can adopt a higher transmission ratio, so that the front and rear wheels 7 of the bicycle can be made smaller, reducing the overall volume and weight of the bicycle, and making the bicycle smaller after folding. In addition, when the bicycle is folded, the folding pedals 8 on both sides can also be folded to a position parallel to the wheels, further reducing the overall volume of the bicycle after folding.

[0088] Specifically, refer to Figures 19 to 23 The foldable footrest 8 includes a crank 81, a third connecting member, a limiting mechanism 50 and a pedal 82;

[0089] One end of the crank 81 is used to connect to the input end of the transmission mechanism, and the other end of the crank 81 is provided with a connecting column 10, and a limiting hole 101 is provided on the connecting column; the third connecting member includes a connecting pipe 20 and a guide pipe 30 that are interconnected, one end of the guide pipe 30 is fixed to the side wall of the connecting pipe 20, and the connecting pipe 20 can be rotatably sleeved on the connecting column 10;

[0090] Reference Fig. 22The pedal 82 is provided with a movable rod 40, which is coaxially installed in the guide tube 30, and the movable rod 40 can slide along the axial direction of the guide tube 30. Specifically, after the connecting tube 20 is sleeved on the connecting column 10, it is connected to the connecting column 10 through a cover plate and bolts, so that the connecting tube 20 cannot be separated from the connecting column 10, and the guide tube 21 can be turned over with the axis of the connecting tube 20 as the rotation center; the movable rod 40 is a detachable rod structure. Specifically, one end of the movable rod 40 is fixed to the center position of the pedal 82 by bolts, and the other end of the movable rod 40 is inserted into the guide tube 30. The movable rod 40 is coaxially slidably connected in the guide tube 30, so that the movable rod 40 can be turned over. The end of the rod 40 can be inserted into the limiting hole 101 of the connecting column 10 or detached from the limiting hole 101 and stored in the guide tube 30, so that the pedal 4 is respectively in a supporting state or a folded state. The pedal 82 in the supported state is intersected by the movable rod 40 and the crank 81, which limits the relative rotation of the connecting tube 20 on the connecting column 10, so that the pedal 82 can be stably supported; the pedal 82 in the folded state is stored in the guide tube 30 because the movable rod 40 is not radially limited by the movable rod 40 and can rotate around the limiting column 10. At this time, the user can flip the pedal 82 to a position that fits the frame for easy storage or carrying.

[0091] In addition, refer to Fig.19 The limiting mechanism 50 includes a ball 501, a sleeve 502 and a fixing ring 503; the fixing ring 503 is coaxially mounted on the end of the guide tube 30; a mounting through hole 300 is provided on the tube wall of the guide tube 30, and a limiting groove 401 is provided on the outer wall of the connecting rod 40; the limiting groove 401 can be connected to the mounting through hole 300; the sleeve 502 can be slidably mounted on the guide tube 30, and the end of the sleeve 502 can be against the fixing ring 503; the inner wall of the sleeve 502 is provided with an avoidance groove 504, and the sliding sleeve 502 can make the avoidance groove 504 The groove 504 is connected to the mounting hole 300; the ball 501 is installed in the mounting hole 300, and the diameter of the ball 501 is greater than the wall thickness of the guide tube 30; the ball 501 has a locking position and an unlocking position. When the ball 501 is in the locking position, the inner side of the ball 501 is embedded in the limiting groove 401, and the outer side of the ball 501 abuts against the inner wall of the sleeve 502; when the ball 501 is in the unlocking position, the inner side of the ball 501 abuts against the outer wall of the movable rod 40, and the outer side of the ball 501 is embedded in the avoidance groove 504. In order to prevent the connecting rod 40 from detaching from the guide tube 30 and limit the circumferential rotation of the movable rod 40, the limiting mechanism 50 of this embodiment also includes a limiting pin 505, and the outer wall of the movable rod 40 is provided with a guide groove 402, and the guide groove 402 extends along the axial direction of the movable rod 40. The limiting pin 505 is inserted into the tube wall of the guide tube 30, and the inner end of the limiting pin 505 is inserted into the guide groove 402.

[0092] Reference Fig.21The limiting mechanism 50 also includes a return spring 506, which is sleeved on the guide tube 30, and one end of the return spring 506 abuts against the inner wall of the sleeve 502, and the other end abuts against the fixing ring 503. The sleeve 502 forms a ring step 507 at the bottom of the end away from the avoidance groove 504, so that the end of the return spring 506 can be connected. When the sleeve 502 slides in the direction away from the connecting tube 20, the return spring 506 can be compressed. The user can loosen the sleeve 502 by pulling the connecting rod 40. At this time, the sleeve 502 is still restricted by the ball 501. However, it cannot be reset and the reset spring 506 is continuously compressed; when the end of the movable rod 40 is reinserted into the limiting hole 101, the outer wall of the connecting rod 40 no longer restricts the ball 30, and the limiting groove 401 is aligned with the mounting through hole 300, the sleeve 502 is driven to slide in the direction of the connecting tube 20 under the action of the reset spring 506, and the inner side of the ball 504 is forced to be embedded in the limiting groove 401. At this time, the sleeve 502 is reset and the inner wall of the sleeve 502 limits the ball 501, so that the movable rod 40 cannot undergo axial displacement, thereby improving the stability of the folding foot pedal.

[0093] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A folding bicycle, characterized in that: It includes a head tube, a front wheel structure, a frame, a retractable seat structure and a rear wheel structure; The front wheel structure comprises a front wheel, a front fork and a connecting frame, the connecting frame comprises a support tube and a connecting portion, the connecting portion is fixedly arranged on the side wall of the support tube and communicated with the support tube, the support tube is sleeved on one end of the front fork, the other end of the front fork is rotatably connected to the front wheel, and the connecting portion is hinged to one end of the frame; The rear wheel structure includes a rear wheel and a transmission assembly, wherein the output end of the transmission assembly is connected to the rear wheel, and the seat structure includes a seat and a telescopic tube, wherein the top end of the telescopic tube is connected to the seat, and the bottom end is connected to the transmission assembly via a locking structure; The transmission assembly has a first hinged end and a first clamping end spaced apart from each other on a side away from the rear wheel, and the frame has a second hinged end and a second clamping end spaced apart from each other on a side close to the transmission assembly, the first hinged end is hinged to the second hinged end, and the first clamping end is detachably connected to the second clamping end; When folding, the telescopic tube contracts, the seat moves to the front side of the rear wheel, the front wheel structure is folded to one side of the frame, the rear wheel structure is folded to the other side of the frame, and the head tube is folded to one side of the front wheel structure and is parallel to the front wheel structure as a whole.

2. The folding bicycle according to claim 1, characterized in that: A limiting hole is provided on a side wall at one end of the frame, a first rotating shaft is provided in the limiting hole and a first limiting member is rotatably connected to the limiting hole through the first rotating shaft, a first accommodating groove is provided on the connecting frame, and the first limiting member has a first position located inside the first accommodating groove and a second position separated from the first accommodating groove; The frame is also provided with a first hinge, which is spaced apart from the limiting hole, and the frame is hinged to the connecting frame via the first hinge.

3. The folding bicycle according to claim 2, characterized in that: The first limiting member includes a mounting portion and a rotating portion, the first rotating shaft is passed through the mounting portion, when the first limiting member is located at the first position, the first rotating shaft abuts against the first receiving groove, the rotating portion limits the frame, a first torsion spring is provided on the first rotating shaft, one end of the first torsion spring abuts the mounting portion against the first receiving groove, and the other end of the first torsion spring abuts against the frame.

4. The folding bicycle according to claim 3, characterized in that: The frame is rotatably connected with a first clamping block via a screw, the first clamping block having a first position and a second position for radially limiting the rotating part, and when the first clamping block is located at the second position, the rotating part can rotate radially.

5. The folding bicycle according to claim 1, characterized in that: A folding assembly and a second hinge are provided on the frame at intervals, the folding assembly has a first position in a supporting state and a second position out of the supporting state, and when the folding assembly is in the second position, the frame can rotate relative to the transmission assembly through the second hinge; The transmission assembly further comprises a housing, a first connecting piece is disposed on the housing, and the support tube is detachably connected to the first connecting piece.

6. The folding bicycle according to claim 5, characterized in that: An L-shaped connecting block is provided at one end of the support tube, the first connecting piece is a groove-shaped structure, and the connecting block penetrates into the first connecting piece; One end of the connection block is connected to a limit pin, and the limit pin has a connection end and a movable end. The connection end of the limit pin passes through the connection block and is connected to a positioning block. The positioning block is located inside the first connection member and abuts the connection block against the first connection member.

7. The folding bicycle according to claim 6, characterized in that: An elastic member is provided on the limit pin, one end of the elastic member abuts against the connecting end of the limit pin, and the other end of the elastic member abuts against the connecting block.

8. The folding bicycle according to claim 1, characterized in that: The head tube includes a stand pipe, a third hinge is provided at one end of the connecting frame, a second connecting member is provided inside the connecting frame, and the stand pipe is hinged to the second connecting member through the third hinge; The second connecting member is a groove-shaped structure, with a mounting platform at its upper end, the mounting platform is hinged with a connecting buckle through a connecting shaft, a connecting plate is provided inside the lower end of the riser corresponding to the connecting buckle, a locking buckle capable of being clamped with the connecting plate is provided at the free end of the connecting buckle, a third torsion spring is sleeved on the connecting shaft, and the third torsion spring is respectively connected to the mounting platform and the connecting buckle; The stand pipe has a first position for fitting with the connecting frame and a second position for being detached from the connecting frame. When the stand pipe is in the first position, the lock is engaged with the connecting plate. When the stand pipe is in the second position, the lock is detached from the connecting plate.

9. The folding bicycle according to claim 8, characterized in that: A mounting hole is provided on the side wall of the stand pipe, and the unlocking assembly includes a button, a return spring and an unlocking rod; The button can be slidably installed on the mounting hole, a connecting rod is provided on the inner side of the button, the return spring is sleeved on the connecting rod, one end of the unlocking rod extends into the mounting hole and is coaxially fixed with the connecting rod, the other end of the unlocking rod can be abutted against the lock buckle, and pressing the button can push the unlocking rod to move and push the lock buckle to detach from the connecting plate.

10. The folding bicycle according to claim 8, characterized in that: The third hinged member includes a third hinge portion and a third hinge axis, and the angle between a vertical plane where a line perpendicular to the third hinge axis is located and a vertical plane where a line connecting the front wheel and the rear wheel is located is 45°.

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