Folding bicycle

Abstract

The embodiment of the utility model 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] This utility model relates to the field of bicycle technology, and in particular to a folding bicycle. Background Technology

[0002] Most folding bicycles on the market typically only fold the frame, bringing the front and rear wheels close together on the same plane. While this folding method is simple, the bicycle still occupies a significant amount of space when folded. Some bicycles fold the front and rear wheels parallel to each other, resulting in a smaller overall size. However, this method is usually used on bicycles with larger wheels. These bicycles have lower gear ratios and lower transmission efficiency, and their folded size is still relatively large due to the larger wheels. Furthermore, this folding method requires specialized tools, making disassembly and assembly overly complicated and inconvenient to use. Utility Model Content

[0003] In view of this, the present invention provides a folding bicycle to solve the problem that existing folding bicycles cannot simultaneously achieve both small size after folding and easy assembly / disassembly.

[0004] To achieve one or more of the above objectives or other objectives, this application proposes 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 includes a front wheel, a front fork, and a connecting frame. The connecting frame includes a support tube and a connecting part. The connecting part is fixedly disposed on the side wall of the support tube and communicates 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. The connecting part is hinged to one end of the frame.

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

[0007] The transmission assembly has a first hinge end and a first snap-fit ​​end spaced apart vertically on the side away from the rear wheel, and the frame has a second hinge end and a second snap-fit ​​end spaced apart vertically on the side close to the transmission assembly. The first hinge end is hinged to the second hinge end, and the first snap-fit ​​end and the second snap-fit ​​end are detachably connected.

[0008] When folded, the telescopic tube retracts, the seat moves to the front of the rear wheel, the front wheel structure folds to one side of the frame, the rear wheel structure folds to the other side of the frame, and the head tube folds 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 one side wall of the frame, a first rotating shaft is provided in the limiting hole and a first limiting member is rotatably connected to the first rotating shaft, a first receiving groove is provided on the connecting frame, and the first limiting member has a first position located inside the first receiving groove and a second position disengaged from the first receiving groove.

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

[0011] Furthermore, the first limiting member includes a mounting part and a rotating part. The first rotating shaft passes through the mounting part. When the first limiting member is in the first position, the first rotating shaft abuts against the first receiving groove. The rotating part limits the frame. The first rotating shaft is provided with a first torsion spring. One end of the first torsion spring abuts the mounting part against the first receiving groove, and the other end of the first torsion spring abuts against the frame.

[0012] Furthermore, a first locking block is rotatably connected to the frame by screws. The first locking block has a first position and a second position for radially limiting the rotating part. When the first locking block is in the second position, the rotating part can rotate radially.

[0013] Furthermore, the frame is provided with a folding component and a second hinge at intervals. The folding component has a first position in a supported state and a second position in a dismounted state. When the folding component is in the second position, the frame can rotate relative to the transmission component through the second hinge.

[0014] The transmission assembly also includes a housing, on which a first connector is provided, and the support tube is detachably connected to the first connector.

[0015] Furthermore, one end of the support tube is provided with an L-shaped connecting block, the first connecting member has a groove-shaped structure, and the connecting block passes through the first connecting member;

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

[0017] Furthermore, the limiting pin is provided with an elastic element, one end of which abuts against the connecting end of the limiting pin, and the other end abuts against the connecting block.

[0018] Furthermore, the head tube includes a riser, one end of the connecting frame is provided with a third hinge, a second connector is provided inside the connecting frame, and the riser is hinged to the second connector through the third hinge;

[0019] The second connector is a groove-shaped structure with a mounting platform at its upper end. The mounting platform is hinged to a connecting buckle via a connecting shaft. A connecting plate is provided inside the lower end of the riser corresponding to the connecting buckle. The free end of the connecting buckle is provided with a locking buckle that can engage with the connecting plate. A third torsion spring is sleeved on the connecting shaft. The third torsion spring connects the mounting platform and the connecting buckle respectively.

[0020] The riser has a first position that is attached to the connecting frame and a second position that is detached from the connecting frame. When the riser is in the first position, the latch is engaged with the connecting plate. When the riser is in the second position, the latch is disengaged from the connecting plate.

[0021] Furthermore, the riser has mounting holes on its side wall, and the unlocking assembly includes a button, a reset spring, and an unlocking rod;

[0022] The button is slidably mounted on the mounting hole. A connecting rod is provided on the inner side of the button. The reset spring is sleeved on the connecting rod. One end of the unlocking rod extends into the mounting hole and is fixed coaxially with the connecting rod. The other end of the unlocking rod can abut against the latch. Pressing the button can push the unlocking rod to move and push the latch to disengage from the connecting plate.

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

[0024] Implementing the embodiments of this utility model will have the following beneficial effects:

[0025] After adopting the above-mentioned folding bicycle, by folding the head tube to a position parallel to the front wheel structure, folding the front wheel structure to a position parallel to the frame, disassembling the support tube and transmission assembly on the frame, folding the transmission assembly and rear wheel to a position parallel to the frame, opening the locking structure, and retracting the seat structure, the overall volume occupied by the bicycle after folding is small. At the same time, the structure used for each folding part is simple, easy to operate, and no additional tools are required to assist in disassembly and assembly. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] in:

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the folding bicycle proposed in this application in a supported state;

[0029] Figure 2 This is a schematic diagram of the folding bicycle in a folded state according to an embodiment of the folding bicycle proposed in this application;

[0030] Figure 3 This is a structural schematic diagram of an embodiment of the folding bicycle proposed in this application in a folded state from another perspective.

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

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

[0033] Figure 6 This is a schematic diagram of the structure of the first limiting member in one embodiment of the folding bicycle proposed in this application;

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

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

[0036] Figure 9 An exploded structural diagram of the frame and transmission assembly of an embodiment of the folding bicycle proposed in this application;

[0037] Figure 10 This is a schematic diagram of the transmission assembly and seat structure, among other parts, of an embodiment of the folding bicycle proposed in this application.

[0038] Figure 11 This is a partial schematic diagram of the frame and other structures of an embodiment of the folding bicycle proposed in this application;

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

[0040] Figure 13 This is a schematic diagram of the positioning block in one embodiment of the folding bicycle proposed in this application;

[0041] Figure 14 This is a schematic diagram of the structure of the second connector in one embodiment of the folding bicycle proposed in this application;

[0042] Figure 15 A partial schematic diagram of the stem of an embodiment of the folding bicycle proposed in this application;

[0043] Figure 16 This is a cross-sectional view of the structure, including the stem and connecting frame, of an embodiment of the folding bicycle proposed in this application.

[0044] Figure 17 An exploded structural diagram of the upright tube and second connector, etc., of an embodiment of the folding bicycle proposed in this application;

[0045] Figure 18 This is a schematic diagram of the structure of the folding bicycle, including the stem, according to one embodiment of the present application.

[0046] Figure 19 An exploded view of the folding pedals of an embodiment of the folding bicycle proposed in this application;

[0047] Figure 20 This is a schematic diagram of the sleeve structure in one embodiment of the folding bicycle proposed in this application;

[0048] Figure 21 This is a cross-sectional view of the overall structure of the folding pedals in one embodiment of the folding bicycle proposed in this application.

[0049] Figure 22 This is a schematic diagram of the pedal structure in one embodiment of the folding bicycle proposed in this application;

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

[0051] Figure label:

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

[0053] 2. Frame; 21. Support tube; 211. Connecting block; 212. Limiting pin; 2121. Connecting end; 2122. Movable end; 213. Positioning block; 214. Protrusion; 215. First connecting hole; 217. Elastic element; 22. Limiting hole; 23. First pivot; 231. First torsion spring; 24. First limiting element; 241. Mounting part; 2411. Through hole; 242. Rotating part; 243. Limiting block; 2431. First guide groove; 25. First hinge; 251. First hinge part; 252. First hinge shaft; 26. Second guide groove; 27. First locking block; 28. Second hinge; 291. Second limiting element; 292. Second locking block;

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

[0055] 5. Front wheel; 51. Front fork; 52. Connecting bracket; 521. First receiving groove; 5211. Opening; 522. Hinge platform; 523. Second connecting piece; 5231. Mounting platform; 5232. Connecting shaft; 5233. Connecting buckle; 5234. Lock; 5235. Third torsion spring; 5236. Fastening wall; 5237. Connecting platform; 5238. Third limiting piece; 53. Support tube; 54. Connecting part;

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

[0057] 7. Rear wheels;

[0058] 8. Folding pedal; 81. Crank; 82. Pedal; 10. Connecting post; 101. Limiting hole; 20. Connecting tube; 30. Guide tube; 300. Mounting through hole; 50. Limiting mechanism; 501. Ball bearing; 502. Sleeve; 503. Fixing ring; 504. Clearance groove; 505. Limiting pin; 506. Return spring; 507. Ring step; 40. Movable rod; 401. Limiting groove; 402. Guide groove. Detailed Implementation

[0059] 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 pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

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

[0062] Reference Figures 1 to 23 This application proposes a folding bicycle, including a head tube 1, a front wheel structure, a frame 2, a retractable seat structure 3, a rear wheel structure, and folding pedals 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 part 54. The connecting part 54 is fixedly installed on the side wall of the support tube 53 and communicates 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 part 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, and the input end of the transmission assembly 6 is connected to the folding pedal 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 hinge end and a first snap-fit ​​end spaced apart vertically on the side away from the rear wheel 7, and the frame 2 has a second hinge end and a second snap-fit ​​end spaced apart vertically on the side close to the transmission assembly 6. The first hinge end is hinged to the second hinge end, and the first snap-fit ​​end and the second snap-fit ​​end are detachably connected.

[0066] When folded, the telescopic tube 31 retracts, the seat 36 moves to the front of the rear wheel 7, the front wheel structure folds to one side of the frame 2, the rear wheel structure folds to the other side of the frame 2, the head tube 1 folds to one side of the front wheel structure and is parallel to the front wheel structure as a whole, and the folding pedals 8 fold until they are parallel to the frame 2 as a whole. (Refer to...) Figure 2 and Figure 3 After folding, the overall longitudinal cross-sectional area of ​​the bicycle is slightly larger than that of the front wheel 5. With the transmission component 6 having a high transmission ratio, both the front wheel 5 and the rear wheel 7 of the bicycle can use small-diameter wheels. This makes the overall volume of the bicycle smaller after folding, making it easier to pack or place in a trunk, and simple and portable.

[0067] In this embodiment, refer to Figure 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. Connecting protrusions 214 are provided at both ends of the connecting ring 32. The locking rod 33 passes through the two connecting protrusions 214, with one end connected to the locking buckle 34 and the other end connected to the connecting cap 35. When the height of the seat structure 3 does not need to be adjusted, such as when the bicycle is in a supported or folded state, the locking buckle 34 locks the telescopic tube 31 to prevent displacement. When the height of the seat structure 3 needs to be adjusted, the locking buckle 34 is opened, and the telescopic tube 31 extends and retracts under external force. After adjusting the height, the locking buckle 34 is locked again. When the bicycle is in a folded state, the telescopic tube 31 can be retracted to its shortest length, and the locking buckle 34 can be locked to reduce the overall volume of the folded bicycle.

[0068] In addition, the specific folding method of frame 2 and front wheel structure is as follows: Figures 5 to 8 As shown, a limiting hole 22 is provided on one side wall 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 first rotating shaft 23. A first receiving groove 521 is provided on the connecting part 54. The first limiting member 24 has a first position located inside the first receiving groove 521 and a second position disengaged from the first receiving groove 521. A first hinge member 25 is provided on the frame 2 at a position opposite to the limiting hole 22. The frame 2 is hinged to the connecting part 54 through the first hinge member 25. The first hinge member 25 includes a first hinge part 251 and a part passing through the first hinge part 251. The first hinge shaft 252 is located within the first hinge portion 251. The connecting portion 54 has two hinge platforms 522 spaced apart at a position opposite to the first receiving groove 521. The two ends of the first hinge shaft 252 are rotatably connected to a hinge platform 522 respectively. When the first limiting member 24 is in the second position, the frame 2 can rotate relative to the connecting portion 54 together with the first hinge shaft 252. It can be understood that the first hinge member 25 can also be provided on the connecting portion 54, and the hinge platform 522 can be provided on the frame 2, so that the frame 2 can rotate relative to the connecting portion 54.

[0069] In addition, refer to Figure 6The first limiting member 24 includes a mounting part 241 and a rotating part 242. The first rotating shaft 23 passes through the mounting part 241. When the first limiting member 24 is in the first position, the first rotating shaft 23 abuts against the first receiving groove 521, and the rotating part 242 limits the frame 2. The first rotating shaft 23 is provided with a first torsion spring 231. One end of the first torsion spring 231 abuts the mounting part 241 against the first receiving groove 521, and the other end of the first torsion spring 231 abuts against the frame 2. Specifically, the bottom wall of the first receiving groove 521 has an opening 5211, and the mounting part 241 has a limiting block 243. The limiting block 243 passes through the opening 5211 and is located inside the connecting frame 52. The limiting block 243 has a first guide groove 2431, and one end of the first torsion spring 231 is located in the first guide groove 2431, so that the side wall of the limiting block 243 abuts against the inner wall of the connecting frame 52 to fix the limiting block 243. The mounting part 241 has a through hole 2411 with a cross-shaped longitudinal section. The first rotating shaft 23 passes through the through hole 2411. The length of the first rotating shaft 23 is adapted to 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 shift due to the movement of the bicycle. In addition, the first torsion spring 231 is disposed inside the through hole 2411 and sleeved on the first pivot 23. The inner side wall of the frame 2 is also provided with a second guide groove 26. 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 ensure that the position of the first torsion spring 231 will not shift longitudinally. When it is necessary to restore the bicycle from the folded state to the supported state, the first torsion spring 231 can be installed into the first guide groove 2431, which can quickly position it and is convenient to install.

[0070] When the bicycle needs to be folded, the user turns the rotating part 242. The rotating part 242 has a certain curvature, so that there is a distance between one end of it and the outer wall of the frame 2, making it easy for the user to turn. 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 rotates together with the limiting block 243. The side wall of the limiting block 243 disengages from 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 limiting member 24, the first rotating shaft 23 and the first torsion spring 231 disengage together from the first receiving groove 521. The frame 2 and the connecting frame 52 are separated at one end. 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, refer to Figure 5A first locking block 27 is rotatably connected to the frame 2 via screws. The first locking block 27 has a first position and a second position that radially limits the rotating part 242. When the first locking block 27 is in the second position, the rotating part 242 can rotate radially. The first locking block 27 is located on one side of the rotating part 242. When the first locking block 27 is in the first position, a portion of the rotating part 242 is located between the first locking block 27 and the outer wall of the frame 2, preventing the rotating part 242 from rotating radially during normal bicycle operation. When the user needs to fold the bicycle, the first locking block 27 is rotated to the second position, moving it away from the rotation path of the rotating part 242, and then the front wheel structure can be folded.

[0072] The folding method of frame 2 and transmission assembly 6 is as follows Figures 9 to 13 As shown, after the user disassembles the first latching end and the second latching end, the first hinge end and the second hinge end rotate relative to each other, thereby folding the frame 2 and the rear wheel structure. Specifically, in this embodiment, the frame 2 is provided with a support tube 21. One end of the support tube 21 is connected to the middle of the frame 2, and the other end is the second latching end, which is used to detachably connect to the transmission assembly 6. The second hinge end includes a folding component and a second hinge member 28 spaced apart. The folding component has a first position in a supported state and a second position in a dismounted state. When the folding component is in the second position, the frame 2 can rotate relative to the transmission assembly 6 through the second hinge member 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. Similarly, after disassembling the folding component, the frame 2 and the transmission assembly 6 rotate relative to each other through the second hinge member 28. The structure of the second hinge member 28 is similar to the structure of the first hinge member 25. The folding assembly includes a second limiting member 291, a second rotating shaft, and a second torsion spring. The first hinge end of the transmission assembly 6 is provided with a second receiving groove 61. Its assembly and connection relationship is similar to that between the first limiting member 24, the first rotating shaft 23, the first torsion spring 231, and the first receiving groove 521. Similarly, the folding assembly can be set on the transmission assembly 6, and the second receiving groove 61 can be set on the frame 2. Alternatively, a second locking block 292 similar to the first locking block 27 can be set on the frame 2. The implementation method and working principle are similar to those described above, and will not be repeated here.

[0073] Furthermore, the first snap-fit ​​end of the transmission assembly 6 includes a housing 62, on which a first connector 621 is provided, and the support tube 21 is detachably connected to the first connector 621. After the support tube 21 is detached from the first connector 621, the transmission assembly 6 and the rear wheel 7 are folded by the aforementioned folding assembly and the second hinge 28. Specifically, one end of the support tube 21 is provided with an L-shaped connecting block 211, and the first connecting member 621 has a groove-shaped structure. The connecting block 211 passes through the first connecting member 621. The opening of the first connecting member 621 can be on the left, right, upper or lower side, or both sides or both sides. The connecting block 211 passes through the opening into the interior of the first connecting member 621. One end of the connecting block 211 is connected to a limiting pin 212. 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. The positioning block 213 is located inside the first connecting member 621 and abuts the connecting block 211 against the first connecting member 621.

[0074] Specifically, the limiting pin 212 can be a bolt or a pin, and can also be set around the connecting block 211 to... Figure 12 Taking the illustrated embodiment as an example, the limiting pin 212 is located on one side of the connecting block 211, and the movable end 2122 of the limiting pin 212 and the positioning block 213 clamp the connecting block 211 in the middle. The end of the positioning block 213 away from the limiting 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. The groove wall of the first connecting member 621 is located between the connecting block 211 and the support tube 21.

[0075] The first connector 621 has a second connecting hole 622 on its groove wall. When the support tube 21 is connected to the first connector 621, the protrusion 214 is inserted into the first connecting hole 215 and then partially penetrates into the second connecting hole 622. At the same time, the connecting block 211 abuts against the first connector 621, and the connecting block 211 and the first connector 621 are radially limited.

[0076] In addition, the limiting pin 212 is provided with an elastic element 217. One end of the elastic element 217 abuts against the connecting end 2121 of the limiting pin 212, and the other end abuts against the connecting block 211. When the bicycle is in a supported state, the bicycle will vibrate due to the road conditions during the ride, affecting the stability of the limiting pin 212. The elastic element 217 can generate a force on the limiting pin 212 pointing towards the connecting end 2121. When the limiting pin 212 tends to move towards the positioning block 213, the elastic element 217 can generate a reaction force on the connecting end 2121 of the limiting pin 212, so that it returns to its original position and avoids affecting the normal operation of the bicycle. When the user wants to disassemble the bicycle, the limiting pin 212 is pressed towards the positioning block 213, the elastic element 217 contracts, the user overcomes the elastic force, the movable end 2122 of the limiting pin 212 approaches the connecting block 211, the positioning block 213 moves together, and the protrusion 214 disengages from 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 make the protrusion 214 completely disengage from the first connecting hole 215 and the second connecting hole 622, the moving distance of the limiting 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, which makes the operation more convenient when disassembling and installing the frame 2 and the transmission assembly 6, and the design is more reasonable.

[0077] Furthermore, the folding method of the head tube is as follows: Figures 14 to 18 As shown, the head tube 1 includes a riser tube 11, one end of the connecting frame 52 is provided with a third hinge member 12, and a second connector 523 is provided inside the connecting frame 52. The riser tube 11 is hinged to the second connector 523 through the third hinge member 12.

[0078] The second connector 523 has a groove-shaped structure. Its upper end is provided with a mounting platform 5231. The mounting platform 5231 is hinged to a connecting buckle 5233 via a connecting shaft 5232. The lower end of the riser 11 is provided with a connecting plate 13 corresponding to the connecting buckle 5233. The free end of the connecting buckle 5233 is provided with a locking buckle 5234 that can engage with the connecting plate 13. A third torsion spring 5235 is sleeved on the connecting shaft 5232. The third torsion spring 5235 is connected to the mounting platform 5231 and the connecting buckle 5233 respectively.

[0079] The riser 11 has a first position that is attached to the connecting frame 52 and a second position that is detached from the connecting frame 52. When the riser 11 is in the first position, the latch 5234 is engaged with the connecting plate 13. When the riser 11 is in the second position, the latch 5234 is disengaged from the connecting plate 13.

[0080] Specifically, the mounting platform 5231 and the third hinge 12 are spaced apart from each other on the upper end of the second connector 523. The upper surface of the second connector 523 is a concave structure. The mounting platform 5231 is opened at one end of the concave structure, and the third hinge 12 is opened outside the concave structure. The concave structure and the inner cavity of the riser 11 form a cavity for the connection buckle 5233 to rotate. In this embodiment, the third hinge 12 includes a third hinge part 121 and a third hinge shaft 122. Its structure is similar to that of the first hinge 25 described above, which enables the riser 11 and the second connector 523 to rotate relative to each other.

[0081] In addition, refer to Figure 16 The vertical plane containing the line perpendicular to the third hinge axis 122 and the vertical plane containing the line connecting the front wheel 5 and the rear wheel 7 form an angle of 45°. This allows the stem tube 11 and handlebars to be positioned on the side of the front wheel 5 after the bicycle is folded, and the entire assembly to be parallel to the plane containing the central axis of the folded frame 2, further reducing the volume occupied by the bicycle after folding.

[0082] When the seat tube 11 is in the second position, its outer wall can fit against the outer wall of the fork 51 to achieve the folding operation of the bicycle's front end. When the seat tube 11 is in the first position, it 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 part of the mounting platform 5231 is placed inside the seat tube 11. In order to ensure that the seat tube 11 can maintain the first position stably for a long time and ensure that the user can stably control the front end, this embodiment installs a connecting member 5231 at the mounting platform 5231. The buckle 5233 and the third torsion spring 5235 for fastening and resetting the buckle 5233 are specifically designed. The lower end of the buckle 5234 forms a fastening wall 5236, which fits against the upper wall of the connecting plate 13. The third torsion spring 5235 ensures that the buckle 5233 always has a rotational tendency to fasten towards the connecting plate 13. By setting one or more third torsion springs 5235 on the connecting shaft 5232, the fastening force of the buckle 5233 can be increased, thereby improving the fastening effect when the riser 11 is in the first position.

[0083] Specifically, refer to Figure 17 The mounting platform 5231 includes two adjacent connecting platforms 5237 and a third limiting member 5238. The hinged end of the connecting buckle 5233 is hinged between the two connecting platforms 5237 via a connecting shaft 5232. The third limiting member 5238 is mounted on the two connecting platforms 5237 and includes a mounting plate and a baffle. The two ends of the mounting plate are respectively attached and fixed to the upper ends of the two connecting platforms 5237. 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 the side wall of the connecting buckle 5233 away from the baffle.

[0084] In addition, refer to Figure 14 and Figure 15 The upper end of the latch 5234 is provided with an inclined guide wall, and the two ends of the guide wall are rounded. A reinforcing rib 16 is provided between the lower side wall of the connecting plate 13 and the inner wall of the riser 11. The side wall of the reinforcing rib 16 facing the lower end opening of the riser 11 can fit with the guide wall. When the riser 11 is switched from the second position to the first position, the fit between the reinforcing rib 16 and the guide wall can force the latch 5234 to rotate away from the third limiting member 5238. Specifically, the reinforcing rib 16 can strengthen the connection plate 13. The strength of the connecting plate 13 ensures that it is not easily deformed or broken even when repeatedly pressed and engaged with the latch 5234. The upper wall of the connecting plate 13 can be quickly and tightly fastened to the latching wall 5236 of the latch 5234 by 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 opening end of the riser 11, respectively, and are rounded to improve the smoothness of the riser 11 when it is flipped from the second position to the first position.

[0085] Reference Figure 16 To facilitate the user in releasing the limiting effect of the connecting buckle 5233 on the riser 11 and enabling the riser 11 to be folded and flipped, an unlocking component 14 is installed on the side wall of the riser 11. By the unlocking component 14 abutting against or pulling the buckle 5234, one end of the buckle 5234 of the connecting buckle 5233 rotates away from the connecting plate 13. When the buckle 5234 is completely disengaged from the connecting plate 13, the riser 11 can be flipped and folded. Specifically, the riser 11 has a mounting hole 15 on its side wall. The unlocking assembly 14 includes a button 141, a return spring 142, and an unlocking rod 143. The button 141 is slidably installed in the mounting hole 15. A connecting rod 1411 is provided on the inner side of the button 141. 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. The other end of the unlocking rod 143 can abut against the latch 5234. Pressing the button 141 can push the unlocking rod 143 to move and push the latch 5234 to disengage from the connecting plate 13.

[0086] Reference Figure 17The diameter of the mounting hole 15 is slightly larger than the outer diameter of the button 141, so that when the button 141 moves axially within the mounting hole 15, the bottom wall of the mounting hole 15 is provided with a through hole 2411 smaller than its diameter. The button 141 adopts a T-shaped structure. The connecting rod 1411 can be used to install the return spring 142 and to connect the unlocking rod 143. The unlocking rod 143 adopts a T-bolt. One end of the T-bolt passes through the interior of the connecting rod 1411 and is threadedly fixed to the connecting rod 1411. The other end of the T-bolt abuts against the latch 5234. The T-bolt can also restrict the button 141 and the return spring 142 within 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 within the mounting hole 15 is greater than the width of the connecting plate 13, so as to ensure that the unlocking rod 143 can completely push the latch 5234 away from the connecting plate 13. It should also be noted that the reset spring 142 in this embodiment is a conical helical spring. The conical helical spring can effectively limit the length or space. Through the stacking ability of the conical helical spring, it can store more energy than the cylindrical spring with a smaller footprint, 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 component 6 is connected to the folding pedal 8 of the bicycle, and its output end is connected to the rear wheel 7 of the bicycle. The transmission component 6 can use a high transmission ratio, so that both the front and rear wheels 7 of the bicycle can be made smaller, reducing the overall size and weight of the bicycle, and making the bicycle even smaller when folded. 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 size of the bicycle after folding.

[0088] Specifically, refer to Figures 19 to 23 The folding pedal 8 includes: a crank 81, a third connector, 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 post 10, which is provided with a limiting hole 101; 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 is rotatably mounted on the connecting post 10.

[0090] Reference Figure 22The pedal 82 is equipped with a movable rod 40, which is coaxially installed inside the guide tube 30 and can slide along the axial direction of the guide tube 30. Specifically, after the connecting tube 20 is fitted onto the connecting post 10, it is connected to the connecting post 10 by a cover plate and bolts, so that the connecting tube 20 cannot detach from the connecting post 10, and the guide tube 21 can rotate around the axis of the connecting tube 20. 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 inside the guide tube 30, allowing the pedal 82 to slide along the axial direction of the guide tube 30. The end of the rod 40 can be inserted into the limiting hole 101 of the connecting post 10 or detached from the limiting hole 101 and stored in the guide tube 30, thereby allowing the pedal 82 to be in a supported state or a folded state. In the supported state, the pedal 82 is stably supported because the movable rod 40 and the crank 81 intersect each other, restricting the relative rotation of the connecting tube 20 around the connecting post 10. In the folded state, the pedal 82 is not radially limited by the movable rod 40 and can rotate around the limiting post 10. At this time, the user can flip the pedal 82 to fit the frame for easy storage or carrying.

[0091] In addition, refer to Figure 19 The limiting mechanism 50 includes a ball bearing 501, a sleeve 502, and a retaining ring 503. The retaining ring 503 is coaxially mounted on the end of the guide tube 30. The guide tube 30 has a mounting through hole 300 on its wall, and the connecting rod 40 has a limiting groove 401 on its outer wall. The limiting groove 401 can connect to the mounting through hole 300. The sleeve 502 is slidably fitted onto the guide tube 30, and the end of the sleeve 502 can abut against the retaining ring 503. The inner wall of the sleeve 502 has a clearance groove 504, and sliding the sleeve 502 can allow clearance to be made. The groove 504 connects to the mounting through hole 300; the ball 501 is installed in the mounting through 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 locked position and an unlocked position. When the ball 501 is in the locked 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 unlocked 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 clearance groove 504. To prevent the connecting rod 40 from detaching from the guide tube 30 and to restrict the circumferential rotation of the movable rod 40, the limiting mechanism 50 of this embodiment also includes a limiting pin 505. The outer wall of the movable rod 40 is provided with a guide groove 402, which 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 Figure 21The limiting mechanism 50 also includes a return spring 506, which is sleeved on the guide tube 30. 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 an annular step 507 at the bottom of the end away from the relief groove 504 so that the end of the return spring 506 can be connected. When the sleeve 502 slides away from the connecting tube 20, the return spring 506 can be compressed. The user can release 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 reset and continues to compress the reset spring 506; 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 towards the connecting pipe 20 under the action of the reset spring 506, and the inner side of the ball 504 is forced to embed into the limiting groove 401. At this time, the sleeve 502 resets 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 pedal.

[0093] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this 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 substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A folding bicycle, characterized in that, This includes the head tube, front wheel structure, frame, retractable seat structure, and rear wheel structure. The front wheel structure includes a front wheel, a front fork, and a connecting frame. The connecting frame includes a support tube and a connecting part. The connecting part is fixedly disposed on the side wall of the support tube and communicates 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. The connecting part is hinged to one end of the frame. The rear wheel structure includes a rear wheel and a transmission assembly, the output end of which is connected to the rear wheel. The seat structure includes a seat and a telescopic tube, the top end of which is connected to the seat, and the bottom end of which is connected to the transmission assembly via a locking structure. The transmission assembly has a first hinge end and a first snap-fit ​​end spaced apart vertically on the side away from the rear wheel, and the frame has a second hinge end and a second snap-fit ​​end spaced apart vertically on the side close to the transmission assembly. The first hinge end is hinged to the second hinge end, and the first snap-fit ​​end and the second snap-fit ​​end are detachably connected. When folded, the telescopic tube retracts, the seat moves to the front of the rear wheel, the front wheel structure folds to one side of the frame, the rear wheel structure folds to the other side of the frame, and the head tube folds 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 one side wall of the frame. A first rotating shaft is provided in the limiting hole and a first limiting member is rotatably connected to the first rotating shaft. A first receiving groove is provided on the connecting frame. The first limiting member has a first position located inside the first receiving groove and a second position disengaged from the first receiving groove. The vehicle frame is also provided with a first hinge member, which is spaced apart from the limiting hole. The vehicle frame is hinged to the connecting frame through the first hinge member.

3. The folding bicycle according to claim 2, characterized in that, The first limiting member includes a mounting part and a rotating part. The first rotating shaft passes through the mounting part. When the first limiting member is in the first position, the first rotating shaft abuts against the first receiving groove. The rotating part limits the frame. The first rotating shaft is provided with a first torsion spring. One end of the first torsion spring abuts the mounting part 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, A first locking block is rotatably connected to the frame by screws. The first locking block has a first position and a second position for radially limiting the rotating part. When the first locking block is in the second position, the rotating part can rotate radially.

5. The folding bicycle according to claim 1, characterized in that, The frame is provided with a folding component and a second hinge at intervals. The folding component has a first position in a supported state and a second position in a dismounted state. When the folding component is in the second position, the frame can rotate relative to the transmission component through the second hinge. The transmission assembly also includes a housing, on which a first connector is provided, and the support tube is detachably connected to the first connector.

6. The folding bicycle according to claim 5, characterized in that, One end of the support tube is provided with an L-shaped connecting block, the first connector is a groove structure, and the connecting block passes through the first connector. One end of the connecting block is connected to a limiting pin, which has a connecting end and a movable end. The connecting end of the limiting pin passes through the connecting block and is connected to a positioning block. The positioning block is located inside the first connecting member and abuts the connecting block against the first connecting member.

7. The folding bicycle according to claim 6, characterized in that, The limiting pin is provided with an elastic element, one end of which abuts against the connecting end of the limiting pin, and the other end abuts against the connecting block.

8. The folding bicycle according to claim 1, characterized in that, The head tube includes a riser, one end of the connecting frame is provided with a third hinge, a second connecting member is provided inside the connecting frame, and the riser is hinged to the second connecting member through the third hinge; The second connector is a groove-shaped structure with a mounting platform at its upper end. The mounting platform is hinged to a connecting buckle via a connecting shaft. A connecting plate is provided inside the lower end of the riser corresponding to the connecting buckle. The free end of the connecting buckle is provided with a locking buckle that can engage with the connecting plate. A third torsion spring is sleeved on the connecting shaft. The third torsion spring connects the mounting platform and the connecting buckle respectively. The riser has a first position that is attached to the connecting frame and a second position that is detached from the connecting frame. When the riser is in the first position, the latch is engaged with the connecting plate. When the riser is in the second position, the latch is disengaged from the connecting plate.

9. The folding bicycle according to claim 8, characterized in that, The riser has mounting holes and an unlocking assembly on its side wall. The unlocking assembly includes a button, a reset spring, and an unlocking rod. The button is slidably mounted on the mounting hole. A connecting rod is provided on the inner side of the button. The reset spring is sleeved on the connecting rod. One end of the unlocking rod extends into the mounting hole and is fixed coaxially with the connecting rod. The other end of the unlocking rod can abut against the latch. Pressing the button can push the unlocking rod to move and push the latch to disengage from the connecting plate.

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

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