Triple-folding bicycle without chain transmission shaft

Abstract

The utility model discloses a chain-free three-fold bicycle with a transmission shaft, which comprises a main bicycle frame, and a middle shaft component, a front wheel, a rear wheel and a handlebar are arranged on the main bicycle frame, and the front wheel, the rear wheel and the handlebar are arranged in a folding mode. The transmission shaft is arranged between the middle shaft part and the rear wheel in a transmission manner and is used for transmitting power; the end, connected with the middle shaft part, of the transmission shaft can be rotationally folded with the middle shaft part assembly as the rotation center. According to the three-fold bicycle without the chain and the transmission shaft, the chain-free design is adopted, force transmission is conducted through the transmission shaft, stable force transmission can be achieved through the transmission shaft, chain-free transmission of the bicycle is achieved, meanwhile, the rear wheel, the front wheel and the handlebar are designed in a folding mode, three-fold operation of the bicycle can be achieved, and the bicycle is more convenient to unfold and fold; the occupied space is small and carrying is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycles, in particular to a three-folding bicycle without a chain transmission shaft. Background Art

[0002] Currently, most electric bicycles and electric bikes use chain drives, which often require irregular maintenance and can cause chain detachment during use, causing significant inconvenience for users. Furthermore, chain-driven bicycles also have issues that hinder folding designs, making them inconvenient. Therefore, chainless drives have become a new design trend. However, existing chainless drives typically use direct gear transmission or a ratchet and pawl combined with gear transmission. These structures suffer from unstable transmission during use and make folding impossible.

[0003] Therefore, there is an urgent need to design a three-folding bicycle with a chainless drive shaft that can achieve stable transmission and is easy to fold, so as to realize the chainless transmission of the bicycle and at the same time realize the multi-folding design of the bicycle, making the bicycle easy to fold, taking up little space and easy to carry. Utility Model Content

[0004] The purpose of the utility model is to solve the problems of the chain-driven bicycles in the prior art, such as the need for regular chain maintenance, unstable transmission, and inconvenient folding, as well as the problem of limited folding of the existing chainless transmission bicycles, and to provide a three-folding bicycle with a chainless transmission shaft that can achieve stable transmission and convenient folding, so as to realize the chainless transmission of the bicycle and realize the multi-folding design of the bicycle, so that the bicycle is easy to fold, occupies little space, and is easy to carry.

[0005] The technical solution adopted by the utility model to achieve the purpose of the invention is: a three-fold bicycle without a chain drive shaft, comprising:

[0006] A main frame, wherein the main frame is provided with a central axis component and a foldable front wheel, rear wheel and handlebar;

[0007] The transmission shaft is arranged between the middle shaft component and the rear wheel for transmitting power; wherein,

[0008] The end of the transmission shaft connected to the central axis component can be rotated and folded with the central axis component as the rotation center.

[0009] This chainless, three-folding bicycle with a transmission shaft offers a radical improvement over traditional chain bicycles. It utilizes a single transmission shaft for power transmission, thus avoiding the maintenance, chain breakage, and inconvenient folding issues associated with chain transmissions. Furthermore, while improving the force transmission mechanism, the transmission shaft can be rotated and folded with the central axis as the center of rotation, enabling the rear wheel and transmission shaft to be folded in an integrated manner, resolving the issue of chain transmissions being unable to fold. Furthermore, a three-folding design is employed, with the front wheel, rear wheel, and handlebars each configured as a folding structure. When the bicycle needs to be folded, the rear wheel and transmission shaft can be folded together, staggered relative to the front wheel, on either side of the main frame. Furthermore, the handlebars can be folded downward and backward to the side of the front wheel, allowing the entire bicycle to occupy a very small space when folded. This chainless, three-folding bicycle with a transmission shaft ensures stable force transmission, achieving a chainless transmission, while also enabling a multi-folding design, making the bicycle easy to fold, compact, and portable.

[0010] Preferably, the rotational folding includes vertical folding of the rear wheels and angled folding of the rear wheels. There are two preferred schemes for the rotational folding: one is vertical folding of the rear wheels, that is, the rear wheels fold vertically downward and forward when folding; the other is angled folding of the rear wheels, that is, the rear wheels fold diagonally downward and forward when folding.

[0011] Preferably, the rotational folding is achieved by a rotating member provided in the central axis component, wherein the rotating member is arranged to rotate coaxially with the central axis of the central axis component or to rotate parallel to the central axis. The rotational folding is mainly achieved by a rotating member provided in the central axis component, wherein the rotating member can be arranged to rotate coaxially with the central axis or to rotate parallel to the axis of the central axis.

[0012] Preferably, the central axis component includes a support seat connected to the main frame, a central axis assembly arranged inside the support seat, the rotating member is sleeved inside the support seat and rotates relative to the support seat, or the rotating member is rotatably connected to the support seat. The central axis component mainly includes a support seat connected to the main frame, and a rotating member sleeved inside the support seat and rotates relative to the support seat. The support seat can be integrally provided with the main frame or separately provided, and is mainly used to support the central axis assembly to realize the rotation of the rotating member and thereby realize the folding center of the drive shaft with the axis of the central axis concentric with the axis of the central axis or with a rotating axis parallel to the central axis, forming the rotational folding, so that the rear wheel and the drive shaft can be in an unfolded riding state or a folded and stowed state.

[0013] Preferably, the transmission shaft is connected to a rotating member, and the transmission shaft is rotated and folded with the rotating member arranged coaxially or parallel to the central axis as the rotation center, so that the front and rear wheels are staggered and folded. The rotating member arranged coaxially with the central axis is a rotating member arranged coaxially with the central axis, while the rotating member arranged parallel to the axis is preferably realized by a rotating axis parallel to the central axis. The transmission shaft is connected to the rotating member and the relative rotation of the transmission shaft is achieved by the rotation of the rotating member, thereby realizing the folding design of the transmission shaft. The transmission shaft can be coaxially rotated with the central axis as a concentric circle, or it can be rotated and folded with the rotating axis arranged on the rotating member as the rotation center.

[0014] Preferably, the rotating member includes a coaxial rotating member and an angular rotating member, and the straight folding of the rear wheel is achieved by the coaxial rotating member, and the oblique folding of the rear wheel is achieved by the angular rotating member. The rotating member can be a coaxial rotating member, and the outer circle of the coaxial rotating member is cylindrical, and cooperates with the support seat with the same cylindrical inner hole to achieve the straight rotation and folding of the rear wheel. As another preferred solution, the rotating member can also be an inclined rotating member, that is, the outer circle of the rotatable member is an angled inclined surface, and the corresponding inner hole of the support seat is an angled inclined hole. The outer circle of the rotating member and the inner hole of the support seat form an angled inclined cooperation to achieve the oblique folding of the rear wheel.

[0015] Preferably, the central axis assembly includes a central axis mounting housing and a central axis.

[0016] Preferably, the rear wheel is connected to the transmission shaft via a rear axle assembly, and the rear axle assembly includes a rear axle housing and a rear axle.

[0017] Preferably, the front wheel is connected to the main frame via a front wheel axle assembly, and the front wheel axle assembly includes a hub and a front wheel axle.

[0018] Preferably, the rotating member includes a coaxial rotating member for installing the central axis, a rotating shaft seat arranged outside the coaxial rotating member and a rotating shaft seat cooperating with the rotating shaft seat, a pair of rotating shaft holes are provided on the rotating shaft seat, and a rotating shaft is provided on the rotating shaft seat.

[0019] Preferably, the transmission shaft is connected to the central axis by a gear transmission, and the transmission shaft is connected to the rear wheel by a gear transmission. The transmission shaft preferably utilizes a gear transmission, i.e., a gear transmission is utilized between the transmission shaft and the central axis, and a gear transmission is utilized between the rear end of the transmission shaft and the rear axle of the rear wheel. Preferably, a first driving gear is provided on the central axis, a first driven gear is provided at the front end of the transmission shaft, a second driving gear is provided at the rear end of the transmission shaft, and a second driven gear is provided on the rear axle of the rear wheel, thereby achieving gear transmission of force.

[0020] Preferably, the main frame includes a main beam, a rear support frame, and a front support frame. The rear wheel is detachably connected to the main beam via the rear support frame, allowing the rear wheel to be folded or unfolded. The front wheel is foldably or detachably connected to the main beam via the front support frame, allowing the front wheel to be folded or unfolded. To achieve a three-fold design, the rear wheel is detachably connected to the rear support frame. When folding is required, the rear support frame can be separated from the main beam to achieve rotational folding. The front wheel can be folded by folding the front support frame to the main beam or by detaching the front support frame from the main beam. The handlebars are preferably foldable.

[0021] Preferably, the main beam frame includes a main beam tube, a vertical tube, and a downtube. A seat tube is adjustably mounted on the vertical tube, and a seat cushion is inserted into the seat tube. The ends of the downtube are respectively connected to the main beam tube and the vertical tube, thereby forming a stable triangular structure of the main beam frame. The support seat can be integrated with the vertical tube or separately.

[0022] Preferably, the front support frame includes a front frame and a front fork, and the front fork is a double-arm structure or a single-arm structure; the rear support frame is a double-arm structure or a single-arm structure. The front support frame mainly includes a front frame and a front fork, and the front frame can be integrated with the main beam tube or can be arranged in a split folding manner. The front fork can be fixedly connected to the front frame, or can be arranged in a double-arm double-front fork structure with a fixed front fork and a rotating front fork. The rotating front fork can be detachably connected to the front frame to realize the rotation and folding of the front wheel. The rear support frame can be a double-arm structure or a single-arm structure.

[0023] Preferably, the rear support frame and the main beam frame, as well as the front wheel and the main beam frame, are detachably connected via quick-release assemblies, which include a seat tube or a card holder, a connector, a rear vibration damper, etc. The detachable connection achieved by the quick-release assemblies allows for disassembly and folding, as well as vibration reduction during riding.

[0024] Preferably, the rear support frame is further provided with a pushing assembly for pushing the folded bicycle, the pushing assembly comprising a pushing frame and pushing wheels. The pushing assembly provided on the rear support frame enables pushing the folded bicycle, the pushing frame and pushing wheels may be universal structures, and the pushing wheels may be universal wheels.

[0025] Preferably, the front wheels, rear wheels, and handlebars are folded or unfolded using a folding assembly; the folding assembly includes a trapezoidal folding assembly and a conical folding assembly. Folding or unfolding using the folding assembly is quick and easy, saving effort. The folding assembly can employ various folding structures, not limited to those employing trapezoidal or conical folding buckles, and can be folded in any desired direction.

[0026] Preferably, a motor can be installed on the front wheel or the rear wheel, and a power source can be installed on the main frame. The power source can be installed at any position of the main frame, such as inside the seat tube, behind the seat tube, on the front frame, inside the front and rear of the main beam tube, etc., and the power source can be a battery.

[0027] Preferably, the front wheel axle assembly of the front wheel is also provided with a lock buckle for detachably buckling with the folded rear wheel. In order to fix the folded rear wheel relative to the front wheel in a folded position, the front wheel axle assembly can also be provided with a lock buckle.

[0028] The beneficial effects of the present invention are as follows: the three-fold bicycle with chainless transmission shaft adopts a chainless design and utilizes a transmission shaft to transmit force. The transmission shaft can realize stable force transmission, thereby realizing chainless transmission of the bicycle. At the same time, a folding design is realized for the rear wheel, the front wheel, and the handlebar, thereby realizing a three-folding operation of the bicycle, making it more convenient to unfold and fold the bicycle, taking up less space, and being easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the exploded structure of the utility model's three-fold bicycle without a chain drive shaft;

[0030] Figure 2 It is a partial cross-sectional view of a three-fold bicycle without a chain drive shaft;

[0031] Figure 3 This is a schematic diagram of the exploded structure of the utility model's three-fold bicycle without a chain drive shaft;

[0032] Figure 4 This is a structural diagram of the transmission shaft in the utility model;

[0033] Figure 5 This is a schematic diagram of the one-fold structure of the chainless transmission shaft three-fold bicycle of the utility model;

[0034] Figure 6 This is a schematic diagram of the folding structure of the utility model's three-fold bicycle without a chain transmission shaft, showing two folds and three folds;

[0035] Figure 7 This is a top view of the utility model's chainless transmission shaft three-folding bicycle (the rear wheel is folded straightly, and the transmission gears intersect at right angles) after folding;

[0036] Figure 8 This is a top view of the utility model's chainless transmission shaft three-folding bicycle (the rear wheel is folded straightly, and the transmission gears do not intersect at right angles) after folding;

[0037] Figure 9This is an unfolded top view of the utility model's chainless transmission shaft tri-folding bicycle;

[0038] Figure 10 This is a schematic diagram of a folding method of a three-fold bicycle without a chain drive shaft according to the present invention, wherein the rear wheel is folded in a straight direction;

[0039] Figure 11 This is a schematic diagram of a folding method of a three-fold bicycle without a chain drive shaft, in which the rear wheel is folded obliquely.

[0040] Figure 12 This is a structural diagram of the transmission shaft (non-central axis concentric circle rotating axis folding) of the utility model;

[0041] Figure 13 This is a structural diagram of the folding assembly in the utility model;

[0042] Figure 14 yes Figure 13 A schematic diagram of the structure of an open state of the folding component;

[0043] Figure 15 This is another structural diagram of the folding assembly in the utility model;

[0044] Figure 16 yes Figure 15 A schematic diagram of the structure of an open state of the folding component;

[0045] Figure 17 This is a structural schematic diagram of a three-folding bicycle without a chain drive shaft in Invention Example 2;

[0046] Figure 18 This is a structural schematic diagram of a three-folding bicycle without a chain drive shaft in Invention Example 3;

[0047] Figure 19 This is a schematic structural diagram of a folded state of a three-fold bicycle without a chain drive shaft in Example 3;

[0048] Figure 20 is a top view of the folded state of the three-fold bicycle without a chain drive shaft in Example 3;

[0049] Figure 21 A schematic structural diagram of a three-folding bicycle without a chain drive shaft in Inventive Example 4;

[0050] Figure 22 This is a schematic structural diagram of a folded state of a three-fold bicycle without a chain drive shaft in Example 4;

[0051] Figure 23 This is a schematic diagram of the structure of the chainless transmission shaft tri-fold bicycle in Example 4 in the folded and pushed state;

[0052] Figure 24 A schematic structural diagram of a tri-fold bicycle without a chain drive shaft in Inventive Example 5;

[0053] Figure 25 This is a structural diagram of the seat tube buckle in the utility model;

[0054] In the figure: 1, transmission shaft, 1-1, transmission connecting shaft, 1-2, middle shaft transmission assembly, 1-2-1, first passive transmission housing, 1-2-2, first passive gear, 1-3, rear axle transmission assembly, 1-3-1, second active transmission housing, 1-3-2, second active gear, 1-4, transmission shaft housing;

[0055] 2. Main beam frame, 2-1. Main beam tube, 2-2. Stem tube, 2-3. Down tube; 3. Front frame; 4. Handlebar, 4-1. Handlebar, 4-2. Handlebar stem; 5. Front fork, 5-1. Single arm, 51. Fixed front fork, 52. Rotating front fork, 53. Front fork connector, 54. Front fork rotating axis;

[0056] 6. Folding assembly, 6-1. Folding axis, 6-2. First folding body, 6-3. Second folding body, 6-4. Locking member, 6-5. Trapezoidal groove buckle, 6-6. Conical buckle, 6-7. Convex bayonet, 6-8. Concave bayonet, 61. Handlebar folding assembly, 62. Frame folding assembly, 63. Wheel folding assembly;

[0057] 7. Rear quick release assembly, 7-1. Seat tube assembly, 7-2. Connector, 7-3. Rear vibration damper, 7-4. Card holder, 7-5. Vibration damper plate, 7-6. Seat tube clip, 7-6-1. Clip body, 7-6-2. Clip handle, 7-6-3. Spring, 7-6-4. Nut, 7-7. Seat tube clamp;

[0058] 8. Support seat, 8-1. Rotating member, 8-1-1. Coaxial rotating member, 8-1-2. Angle rotating sleeve, 8-2. Rotating shaft, 8-3. Washer, 8-4. Rear support frame connecting member, 8-5. Rear support frame connecting hole, 8-6. Rotating shaft hole, 8-7. Rotating shaft seat, 8-8. Rotating shaft seat;

[0059] 9. Middle shaft, 9-1. First driving gear, 9-2. Middle shaft mounting housing, 9-3. Housing external thread, 9-4. Locking nut;

[0060] 10. Front wheel, 11. Rear wheel, 12. Seat tube, 13. Saddle; 14. Front wheel axle assembly, 14-1. Front wheel axle, 14-2. Hub;

[0061] 15. Rear wheel axle assembly, 15-1. Rear wheel axle, 15-2. Rear wheel axle housing, 15-3. Second driven gear, 15-4. Rear wheel axle through hole, 15-5. Rear wheel axle slot;

[0062] 16. Rear support frame, 16-1. Chain stay, 16-2. Seat stay, 16-3. Connecting tube, 16-4. Connecting plate, 16-5. Adjusting plate, 16-8. Rotating sleeve connecting plate, 16-9. Rotating sleeve connecting hole;

[0063] 17. Pedal crank; 18. Pushing assembly, 18-1. Pushing frame, 18-2. Pushing wheel; 20. Front wheel detachable assembly, 20-1. Front socket, 20-2. Front plug-in component, 20-3. Front shock absorber; 21. Rear fixing plate, 22. Rear fixing hole, 23. Rear fork fixing plate, 24. Rear fork fixing hole. DETAILED DESCRIPTION

[0064] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0065] Example 1:

[0066] exist Figure 1 、 Figure 2 、 Figure 3 、 Figure 9 As shown, a three-folding bicycle with a chainless transmission shaft comprises a main frame, a central axis component provided on the main frame, and a foldable front wheel 10, a rear wheel 11 and a handlebar 4; a transmission shaft 1 is provided between the central axis component and the rear wheel 11 for transmitting power; wherein, the end of the transmission shaft 1 connected to the central axis component can be rotated and folded with the central axis component as the rotation center. The rotational folding can be divided into straight folding of the rear wheel and oblique folding of the rear wheel according to the angle of the folding direction during the folding of the rear wheel. The rotational folding is achieved by a rotating member provided in the central axis component, and the rotating member is arranged to rotate coaxially with the central axis 9 in the central axis component or to rotate parallel to the central axis 9.

[0067] The central axis component includes a support seat 8 connected to the main frame, a central axis assembly arranged inside the support seat 8, and the rotating member is sleeved inside the support seat 8 and rotates relative to the support seat 8 or the rotating member is rotationally connected to the support seat.

[0068] The transmission shaft 1 is connected to a rotating member, and the transmission shaft 1 is rotated and folded with the rotating member arranged coaxially or parallel to the central axis as the rotation center, so that the front wheel 10 and the rear wheel 11 are staggered and folded.

[0069] The rotating member 8-1 includes a coaxial rotating member and an angular rotating member. The straight folding of the rear wheel is achieved by the coaxial rotating member, and the oblique folding of the rear wheel is achieved by the angular rotating member.

[0070] The coaxial rotating part is a coaxial rotating part 8-1-1 or a combination of a coaxial rotating part 8-1-1 and a coaxial rotating shaft; the angular rotating part is an angular rotating sleeve 8-1-2 or a combination of a coaxial rotating part 8-1-1 and an angular rotating shaft.

[0071] like Figure 10 As shown, the rotating member 8-1 adopts a coaxial rotating member 8-1-1, that is, a cylindrical rotating sleeve, and the outer wall of the coaxial rotating member 8-1-1 is a cylindrical structure, so that the rear wheel can be folded straight.

[0072] like Figure 11 As shown, rotating member 8-1 utilizes an angled rotating sleeve 8-1-2, the outer wall of which is inclined. This outer wall cooperates with the inclined inner wall of the support base to achieve angular rotation, thereby enabling the rear wheel to tilt and fold during folding. During this process, the rotational centerline L1 of the drive shaft 1 is not aligned with the centerline L of the central axle, while the angle of the angled rotating sleeve is concentric with the drive shaft rotational centerline L1.

[0073] The transmission shaft 1 is connected to the central axis by a gear transmission, and the transmission shaft 1 is connected to the rear wheel 11 by a gear transmission. The transmission shaft 1 and the central axis can be connected by a right-angled gear transmission or a non-right-angled gear transmission. The position and specific structure of the transmission gear can be selected and configured according to actual needs.

[0074] After the rear wheels are folded straight or at an angle, the transmission gears are arranged at right angles and non-right angles, so the transmission shaft and the main beam can be in a parallel or non-parallel state after folding. That is, according to the position of the transmission shaft and the main beam, there are two states: the folded parallel state and the folded parallel state (see Figure 7 ), and folded tilt state, the transmission shaft and the main beam frame are tilted at a certain angle α instead of being parallel (see Figure 8 ).

[0075] In this embodiment, the central axis component includes a support base 8 connected to the main frame, a rotating member 8-1 mounted within the support base 8 and rotating relative to the support base 8, and a central axis assembly disposed within the rotating member 8-1. The central axis assembly includes a central axis 9, a central axis mounting housing 9-2, and a first driving gear 9-1 disposed on the central axis 9.

[0076] The main frame includes a main beam 2, a rear support frame 16, and a front support frame. The rear wheel 11 is detachably connected to the main beam 2 via the rear support frame 16, so that the rear wheel 11 can be folded or unfolded. The front wheel 10 is foldably or detachably connected to the main beam 2 via the front support frame, so that the front wheel 10 can be folded or unfolded. The rear support frame 16 and the main beam 2, as well as the front wheel 10 and the main beam 2, are detachably connected via quick-release assemblies. The quick-release assemblies include a rear quick-release assembly 7 and a front wheel detachable assembly 20. The front wheel 10, rear wheel 11, and handlebar 4 are folded or unfolded using a folding assembly 6; the folding assembly 6 includes a trapezoidal folding assembly, a conical folding assembly, and other folding assemblies that can perform this folding function.

[0077] The main beam frame 2 includes a main beam tube 2-1, a vertical tube 2-2 connected to the main beam tube 2-1, and a down tube 2-3 connected to the rear lower part of the main beam tube 2-1. A seat cushion 13 is adjustably inserted into the upper end of the vertical tube 2-2 through a seat tube 12. The front support frame includes a front frame 3 and a front fork 5.

[0078] In this embodiment, a front frame 3 is foldably mounted on the front end of the main beam tube 2-1. The front frame 3 and handlebar 4 are foldably mounted on the main beam 2. A front fork 5 is mounted on the front frame 3, and the front wheel 10 is mounted on the front fork 5 via a front axle assembly 14. The front and rear wheels each have spokes, and conventional front and rear wheels of various types and models can be used. The front axle assembly 14 includes a front axle 14-1 and a hub 14-2 disposed on the exterior of the front axle 14-1. The front fork 5 has a double-arm structure or a single-arm structure. The double-arm structure further includes a single-group double-arm structure and a dual-assembly double-arm structure. In this embodiment, a single-group double-arm structure is used. The handlebar 4 includes a grip 4-1 and a handlebar stem 4-2.

[0079] The rear wheel 11 is arranged on the rear support frame 16 through the rear wheel axle assembly 15. The rear wheel axle assembly 15 includes a rear wheel axle 15-1 and a rear wheel axle housing 15-2 arranged outside the rear wheel axle 15-1, and a second driven gear 15-3 arranged inside the rear wheel housing 15-2 and arranged on the rear wheel axle 15-1.

[0080] The handlebars 4 and the front frame 3 can each be folded relative to the main beam tube 2-1 via a folding assembly 6, so that the folding bicycle has both an unfolded riding state and a folded state. Specifically, a handlebar folding assembly 61 is provided between the handlebars 4 and the front frame 3, and a frame folding assembly 62 is provided between the main frame 2 and the front frame 3.

[0081] The lower end of the vertical tube 2-2 is fixedly connected to a support base 8. The support base 8 has a sleeve structure. A rotating member 8-1 is rotatably disposed within the support base 8. The rotating member 8-1 is a coaxial rotating member 8-1-1. The rotating member 8-1 is provided with a rear support frame connecting member 8-4. The rear support frame connecting member 8-4 is provided with a rear support frame connecting hole 8-5. The rear support frame connecting hole 8-5 is fastened to the rear support frame via fasteners. The pedal cranks 17 are connected to both ends of the central shaft 9. A central shaft mounting housing 9-2 is provided on the exterior of the central shaft 9. The central shaft mounting housing 9-2 is rotatably connected to the rotating sleeve. The end of the central shaft mounting housing 9-2 not connected to the transmission shaft 1 is provided with an external housing thread 9-3. A washer 8-3 is fixedly connected to the front end of the rear support frame 16. The washer 8-3 and the rear support frame 16 can be separated or integrated. During installation, the central axis mounting shell passes through the rotating member 8-1, and the rotating member 8-1 is arranged inside the support seat 8. The protruding end of the central axis mounting shell passes through the washer 8-3 and is locked and fixed by a locking nut 9-4.

[0082] The transmission shaft 1 and rear wheel 11 can be folded relative to the main beam frame 2, and the rotation center of the folding is rotated by the central axis concentric circle or the rotation axis plus an angle (sleeve) set on the support seat 8, so that the front and rear wheels can be folded in an offset manner without interference.

[0083] like Figure 2 、 Figure 4 As shown, the transmission shaft 1 includes a transmission connecting shaft 1-1, a central shaft transmission assembly 1-2, and a rear wheel shaft transmission assembly 1-3. The central shaft transmission assembly 1-2 includes a first passive transmission housing 1-2-1 and a first passive gear 1-2-2. The rear wheel shaft transmission assembly 1-3 includes a second active transmission housing 1-3-1 and a second active gear 1-3-2. The two ends of the transmission connecting shaft 1-1 are respectively rotatably connected to the first passive transmission housing 1-2-1 and the second active transmission housing 1-3-1 via transmission bearings. The first passive gear 1-2-2 is provided at the end of the transmission connecting shaft 1-1 facing the central shaft, and the second active gear 1-3-2 is provided at the end of the transmission connecting shaft 1-1 facing the rear wheel shaft.

[0084] like Figure 12As shown, the rotating member 8-1 includes a coaxial rotating member 8-1-1 for mounting the central axis, a rotating shaft seat 8-7 disposed on the outside of the coaxial rotating member 8-1-1, and a rotating shaft seat 8-8 cooperating with the rotating shaft seat. A pair of rotating shaft holes 8-6 are disposed on the rotating shaft seat 8-7, and a rotating shaft 8-2 is disposed on the rotating shaft seat 8-8. During use, the rotating shaft 8-2 rotates in conjunction with the rotating shaft holes. The rotating shaft 8-2 can be a cylindrical shaft or an angled shaft. The outer circle of the rotating shaft cooperates with the inner wall of the rotating shaft hole 8-6 to achieve straight folding of the rear wheel and angular folding of the rear wheel. To implement straight folding of the rear wheel, the outer wall of the rotating shaft is a cylindrical structure, and the corresponding inner wall of the rotating shaft hole 8-6 is a cylindrical structure. The outer wall of the rotating shaft and the inner wall of the rotating shaft hole 8-6 adopt a cylindrical surface to cooperate. To achieve angular folding of the rear wheel, the outer wall of the rotating shaft and the inner wall of the rotating shaft hole 8-6 adopt an oblique angle to cooperate. Under this structure, the transmission shaft folds and rotates with the rotating shaft hole 8-6 on the rotating sleeve as the rotation center.

[0085] The second active transmission housing 1-3-1 and the rear axle housing 15-2 can be either an integral or split structure. The central axle mounting housing 9-2 and the first passive transmission housing 1-2-1 can be either an integral or split structure. In this example, the second active transmission housing 1-3-1 and the rear axle housing 15-2 are split structures, and the central axle mounting housing 9-2 and the first passive transmission housing 1-2-1 are also split structures.

[0086] The second active transmission housing 1-3-1 or the rear axle housing 15-2 is provided with a rear axle through hole 15-4 or a rear axle slot 15-5 (see Figure 4 ).

[0087] The first passive gear 1-2-2 on the transmission shaft 1 meshes with the first active gear 9-1, and the first passive transmission housing 1-1-1 is fixedly connected to the central shaft mounting housing 9-2 on the central shaft 9 and can rotate along the rotating member 8-1, thereby achieving the folding of the rear wheel 11 and the transmission shaft 1 relative to the central shaft 9.

[0088] The second active transmission housing 1-3-1 on the transmission shaft 1 is fixedly connected to the rear wheel axle housing 15-2, and the second active gear 1-3-2 is meshed with the second passive gear 15-3 on the rear wheel axle 15-1.

[0089] The transmission process is as follows: when the pedal crank 17 is stepped on, the middle shaft 9 rotates and drives the first driving gear 9-1 thereon to move together.

[0090] The first driving gear 9-1 rotates, driving the first driven gear 1-2-2 meshing with it to rotate together. The first driven gear 1-2-2 drives the transmission connecting shaft 1-1 to rotate. The rotation of the transmission connecting shaft 1-1 drives the second driving gear 1-3-2 to rotate. The second driving gear 1-3-2 drives the second driven gear 15-3 meshing with it to rotate. The second driven gear 15-3 drives the rear wheel shaft 15-1 to rotate. The rear wheel shaft 15-1 drives the rear wheel 11 to rotate, thereby driving the bicycle. The transmission shaft without a chain drive is used for transmission, which has high transmission efficiency, good transmission efficiency, stable drive, and does not have problems such as chain loosening.

[0091] When folding is required, the front end of the transmission shaft 1 can be folded with the central axis 9 as a concentric circle or the rotation axis as the folding center.

[0092] The rear support frame 16 can be a double-arm or single-arm structure. In this embodiment, the rear support frame 16 is a double-arm structure. The single-sided rear support frame 16 is symmetrically arranged on either side of the rear wheel 11 in a triangular configuration and connected to the rear wheel axle 15-1. The upper end of the rear support frame 16 is movably connected to the riser 2-2 via a rear quick-release assembly 7. When the rear wheel 11 needs to be folded, the rear support frame 16 can be smoothly disconnected from the riser 2-2.

[0093] The rear support frame 16 includes a rear lower fork 16-1, a rear upper fork 16-2 and a connecting tube 16-3. The rear lower fork is arranged parallel to the transmission shaft 1, and the rear upper fork is arranged obliquely above the rear lower fork. The two ends of the connecting tube are respectively connected to the rear lower fork and the rear upper fork and are connected to the transmission shaft. A rotating sleeve connecting plate 16-8 is provided at the lower end of the connecting tube 16-3. The rotating sleeve connecting plate 16-8 and the rear support frame connecting hole 8-5 can be separated or integrated. When separated, the rotating sleeve connecting plate is provided with a rotating sleeve connecting hole 16-9. The rotating sleeve connecting hole 16-9 cooperates with the rear support frame connecting hole 8-5 and is fixed by fasteners. The number of rotating sleeve connecting holes 16-9 is based on the number of holes that are provided to achieve a good positioning function.

[0094] The second active transmission housing 1-3-1 is also provided with a rear fixing plate 21 for connecting to the rear support frame 16. The rear fixing plate 21 is provided with a rear fixing hole 22. Correspondingly, a rear fork fixing plate 23 is provided at the lower end of the rear seat stay 16-2. The rear fork fixing plate 23 is provided with a rear fork fixing hole 24. The rear fork fixing hole 24 is fixedly connected to the rear fixing hole 22 via a fastening member. The rear fixing plate 21 and the second active transmission housing 1-3-1 can be an integral structure or a separate structure, and the rear fork fixing plate 23 and the rear seat stay 16-2 can be an integral structure or a separate structure.

[0095] The rear support frame 16 and the transmission shaft 1 can be provided separately, or they can be combined into an integral structure and then installed.

[0096] The rear quick-release assembly 7 comprises a seat tube assembly 7-1 fixed to the seat tube 2-2, a connector 7-2 mounted on the upper end of the rear support frame, and a rear vibration damper 7-3 mounted on the connector 7-2. The rear vibration damper 7-3 can be a spring damper, a damping block, or any other type of damper. In this embodiment, the rear vibration damper 7-3 is a spring damper.

[0097] like Figure 25 As shown, the seat tube assembly 7-1 is locked by a seat tube buckle 7-6, which includes a buckle body 7-6-1 provided on the seat tube assembly 7-1, a buckle handle 7-6-2 connected to the buckle body 7-6-1, a spring 7-6-3 and a fastening nut 7-6-4 connected to the seat tube assembly 7-1, and a tube clamp 7-7. Of course, the structure of the buckle is not limited to Figure 25 The structure shown may also be other conventional structures in the prior art.

[0098] A pushing assembly 18 is also mounted on the rear support frame 19 near the connector 7-2. The pushing assembly 18 comprises a pushing frame 18-1 and pushing wheels 18-2. The pushing frame 18-1 can be a single-frame structure or a multi-frame structure, and the pushing wheels can be a dual-wheel structure or a multi-wheel structure. In this embodiment, the pushing frame is a single-frame structure, and the pushing wheels are dual-wheel structures. The pushing wheels and the pushing frame can be interchangeable structures, and the pushing wheels can also be universal wheels.

[0099] like Figure 13 、 14 As shown in Figures 15 and 16, the frame folding assembly 62 and the handlebar folding assembly 61 include but are not limited to trapezoidal folders and conical folders. Specifically, the folding assembly 6 includes a first folding body 6-2 and a second folding body 6-3 rotatably connected by a folding shaft 6-1, and a locking member 6-4 provided on one of the folding bodies. The first and second folding bodies are connected to each other by a snap-fit connection. The connection can be made by a trapezoidal groove buckle 6-5 or a conical buckle 6-6. When a conical buckle is used, a convex snap-fit 6-7 and a concave snap-fit 6-8 are provided on the first and second folding bodies, respectively.

[0100] The bicycle can be a pedal crank type, with a transmission mounted on the rear wheel. Alternatively, it can be electric. In this case, the motor can be mounted on the front wheel, the rear wheel, or even the center axle. The power source can be installed inside the seat tube 12, at the rear of the seat tube, in the front frame, or inside the front and rear ends of the main beam tube, among other options. Any design that facilitates integrated design and reduces space requirements is possible, and the power source includes a battery. The entire frame can be either a monolithic or welded structure; the brake cables can be concealed or external.

[0101] In order to facilitate the fixation after folding, a lock is further provided on the front wheel axle 14 - 1 of the front wheel 10 for fastening the rear wheel 11 after folding.

[0102] like Figure 5 、 Figure 7 、 Figure 8 As shown, folding method (using rear wheels to fold straight):

[0103] The rear wheel is folded straight. First, the rear support frame 16 is disconnected from the vertical tube 2-2 by the rear quick-disassembly assembly 7. Then, the rear wheel 11, the rear support frame 16 and the transmission shaft 1 are rotated downward and forward along the central axis 9 or the rotating member 8-1 on the central axis as the rotation center by the weight of the rear wheel 11. The rear wheel 11, the rear support frame 16 and the transmission shaft 1 are folded to the bottom of the main beam frame 2. Figure 7 The transmission shaft 1 is parallel to the main beam 2. In this case, the transmission is carried out by right-angled gears. Figure 8 As shown, there is a positioning angle α between the transmission shaft 1 and the main beam frame 2. At this time, the gear non-right angle transmission is adopted. At this time, the pushing wheel 18-1 in the pushing assembly 18 contacts the ground, realizing the straight folding operation of the rear wheels.

[0104] To fold the front wheel, first, unlock and open the frame folding assembly 62, then fold the front wheel 10 and the handlebar 4 on it toward the rear side of the main beam 2. According to the opening and closing installation direction of the folding assembly 62, the front wheel 10 can be folded to the left or right side of the rear wheel 11 (the front wheel 10 is folded to the left, which is the left side). Figure 6 、 Figure 7 and Figure 8 , and vice versa on the right side), so that the front wheel 10 and the rear wheel 11 are roughly in a parallel state, making the folding space more compact and completing the front wheel folding operation.

[0105] The handlebar folding operation is as follows: first, the handlebar folding assembly 61 is unlocked and opened, and the handlebar 4 is rotated backward and downward to fold it, so that the handle 4-1 of the handlebar 4 is horizontally arranged on the outside of the folded side of the front wheel 10, completing the handlebar folding operation.

[0106] Finally, the front wheel 10 and the rear wheel 11 are locked together by means of a lock, and the seat cushion 13 is pressed downwards to retract the seat tube 12 into the interior of the seat tube 2 - 2 , thus completing the folding operation of the entire vehicle.

[0107] The folding method is quick and easy to operate, occupies little space, and can be pushed and carried easily.

[0108] Example 2:

[0109] exist Figure 17 In the embodiment shown, a three-fold bicycle without a chain drive shaft has a technical solution substantially the same as that of embodiment 1, except that the rear support frame 16 and the front fork 5 each adopt a single-arm structure.

[0110] The rear support frame 16 is an overall triangular structure and is arranged on one side of the rear wheel 11 and is connected to the rear wheel axle assembly 15. The rear support frame 16 can be arranged on the same side as the transmission shaft 1, or on the side opposite to the transmission shaft 1. In this embodiment, the rear support frame 16 is preferably arranged on the same side as the transmission shaft 1 and is connected to the transmission shaft 1. Specifically, the unilateral rear support frame 16 includes a rear lower fork 16-1, a rear upper fork 16-2 and two connecting tubes 16-3, the rear lower fork 16-1 is arranged parallel to the transmission shaft 1, the rear upper fork 16-2 is arranged obliquely above the rear lower fork 16-1, and the two ends of the connecting tube 16-3 are respectively connected to the rear lower fork 16-1 and the rear upper fork 16-2 and are connected to the transmission shaft.

[0111] The front fork 5 is arranged on the front frame 3 on the side opposite to the rear support frame 16, and the front fork 5 includes an arc-shaped single arm 5-1.

[0112] In other embodiments, a mixed structure may also be adopted, that is, the single-arm structure may be combined with the double-arm structure in Example 1, that is, a single-arm + double-arm mixed structure may be adopted. For example, the rear support frame 16 may adopt a double-arm structure, while the front fork 5 may adopt a single-arm structure, or the rear support frame 16 may adopt a single-arm structure, while the front fork 5 may adopt a double-arm structure, and so on.

[0113] Example 3:

[0114] exist Figure 18 The illustrated embodiment is a chainless, three-axle foldable bicycle. Its technical solution is essentially the same as that of Example 1, differing in that the rotating member 8-1 utilizes an angled rotating sleeve 8-1-2. The front wheel 10 and handlebars 4 are each foldably mounted on the front frame 3. The front frame 3 is integrally formed with the main beam 2. The handlebars 4 and front wheel 10 can each be folded relative to the main beam 2, allowing the foldable bicycle to have both an unfolded and a folded configuration.

[0115] A handlebar folding assembly 61 is provided between the handlebar 4 and the front frame 3 , and a wheel folding assembly 63 is provided between the front wheel 10 and the front frame 3 .

[0116] The rear support frame 16 is a double-arm structure. It is symmetrically positioned on either side of the rear wheel 11 and connected to the rear wheel axle assembly 15. The upper end of the rear support frame 16 is movably connected to the seat tube 2-2 via a rear quick-release assembly 7. When the rear wheels need to be folded, the rear support frame 16 can be smoothly disconnected from the seat tube 2-2.

[0117] The rear support frame 16 includes a seat fork 16-2 and a connecting plate 16-4. The seat fork 16-2 is tilted above the transmission shaft 1, and the two ends of the connecting plate 16-4 are respectively connected to the seat fork 16-2 and the support base 8. The seat fork 16-2 is connected to the rear wheel axle assembly 15 through an adjustment plate 16-5.

[0118] The rear quick-release assembly 7 includes a card holder 7-4 fixedly mounted on the vertical tube 2-2, a vibration damping plate 7-5 mounted on the upper end of the rear support frame 16, a connector 7-2 mounted on the vibration damping plate 7-5, and a rear vibration damper 7-3 mounted on the connector 7-2. The card holder 7-4 is mounted on the vertical tube 2-2 below the main beam tube 2-1 of the main beam frame 2. The connector 7-2 is connected to the card holder 7-4 in a card-type connection. The rear vibration damper 7-3 is compressed between the vibration damping plate and the card holder. The rear vibration damper can be a spring damper, a damping block, or other various types of vibration dampers. The vibration damping plate 7-5 is fixedly connected to the two connecting plates 16-4 in the rear support frame 16 as a whole.

[0119] A push assembly 18 is also provided on the rear support frame 16 behind the vibration damping plate 7-5. The push assembly 18 is provided at an angle in front of and above the rear wheel 11. The push assembly 18 comprises a push frame 18-1 and a push wheel 18-2. The push frame 18-1 is an H-shaped support structure, and the push wheel 18-2 is a double-wheel structure. Figure 21 It adopts a four-wheel structure.

[0120] like Figure 11 、 Figure 19 、 20 As shown, folding method (rear wheel angle folding):

[0121] The rear wheel is folded obliquely. First, the rear support frame is disconnected from the seat tube 2-2 through the rear quick-detach assembly. Then, the rear wheel, the rear support frame and the transmission shaft are rotated downward and sideways along the central axis or the rotating sleeve on the central axis as the rotation center by the weight of the rear wheel. The rear wheel, the rear support frame and the transmission shaft are folded to one side of the main frame and are at a certain inclination angle with the main frame. At this time, the pushing wheel in the pushing assembly is in contact with the ground, realizing the oblique folding operation of the rear wheel.

[0122] To fold the front wheels, first, unlock and open the front wheel folding device, then fold the front wheels to the rear side of the main frame. The folding direction is to the side opposite to the side of the main frame where the rear wheels are located, so that the front wheels and rear wheels are roughly parallel. At this time, the front wheels and the main frame are also set at a certain tilt angle, so that the front wheels and rear wheels are respectively on both sides of the main frame, making the folding space more compact, and completing the front wheel folding operation.

[0123] To fold the handlebar, first, unlock and open the handlebar folding device, rotate the handlebar backward and downward to fold it so that the handlebar is horizontal and folded on the outside of the folding side of the front wheel, completing the handlebar folding operation.

[0124] Finally, the front wheel and the rear wheel are locked together by means of a lock buckle, and the seat cushion is pressed downwards to retract the seat tube 12 into the interior of the seat tube 2-2, thus completing the folding operation of the entire vehicle.

[0125] Example 4:

[0126] exist Figure 21 The embodiment shown is a chainless, drive shaft, three-folding bicycle. Its technical solution is essentially the same as that of embodiment 3, except that a detachable front wheel assembly 20 is provided between the front wheel 10 and the front frame 3. The detachable front wheel assembly 20 includes a front socket 20-1, a front insert 20-2, and a front vibration damper 20-3.

[0127] The front fork 5 is a double-arm, double-fork structure. It includes a fixed front fork 51 and a rotating front fork 52. The upper end of the rotating front fork 52 is detachably connected to the front frame 3 via the detachable front wheel assembly 20. The lower end of the rotating front fork 52 is provided with a front fork connector 53, which is arranged parallel to the main frame. The front fork connector 53 is rotationally connected to the fixed front fork 51 via a front fork rotating shaft 54. The front wheel 10 is provided at the lower end of the rotating front fork 52 via the front wheel axle 14-1. When the detachable front wheel assembly 20 is unlocked, the front wheel 10 and the rotating front fork 52 can be folded backward relative to the main frame, with the front fork rotating shaft 54 as the rotation center.

[0128] A push assembly 18 is also mounted on the rear support frame 16 behind the vibration damping plate 7-5. This push assembly 18 is tilted and positioned above and in front of the rear wheel 11. This push assembly 18 comprises a push frame 18-1 and push wheels 18-2. The push frame 18-1 is a cubical structure, while the push wheels 18-2 are dual-wheeled, with two sets of front and rear wheels. When the rear wheels are folded, both sets of wheels contact the ground, allowing the folded bicycle to be moved freely and easily. The folded rear wheels are located in the space above the push frame.

[0129] like Figure 21 、 23 As shown, folding method (rear wheel angle folding, front wheel rotation folding):

[0130] The rear wheel is folded obliquely. First, the rear support frame is disconnected from the seat tube 2-2 through the rear quick-detach assembly. Then, the rear wheel, the rear support frame and the transmission shaft are rotated downward and sideways along the central axis or the rotating sleeve on the central axis as the rotation center by the weight of the rear wheel. The rear wheel, the rear support frame and the transmission shaft are folded to one side of the main frame and are at a certain inclination angle with the main frame. At this time, the pushing wheel in the pushing assembly is in contact with the ground, realizing the oblique folding operation of the rear wheel.

[0131] To fold the front wheel, first, unlock and open the detachable front wheel assembly. Then, rotate the front wheel and the swivel front fork downward and toward the bottom of the fixed front fork around the front fork rotation axis, allowing the front wheel and the swivel front fork to fold toward the rear side of the main frame. The folding direction is to the side of the main frame opposite to the side where the rear wheel is located, so that the front and rear wheels are roughly parallel. At this time, the front wheel and the main frame are also set at a certain angle, so that the front and rear wheels are respectively on either side of the main frame, making the folding space more compact, and the front wheel folding operation is completed. The folded front wheel is located in the front fork space formed by the fixed front fork and the swivel front fork.

[0132] To fold the handlebar, first, unlock and open the handlebar folding device, rotate the handlebar backward and downward to fold it so that the handlebar is folded in an inclined state on the outside of the folding side of the front wheel, completing the handlebar folding operation.

[0133] Finally, the front wheel and the rear wheel are locked together by means of a lock buckle, and the seat cushion is pressed downwards to retract the seat tube 12 into the interior of the seat tube 2-2, thus completing the folding operation of the entire vehicle.

[0134] Example 5:

[0135] exist Figure 24The illustrated embodiment is a chainless, three-folding bicycle with a drive shaft. The technical solution is substantially the same as that of Example 2, except that the drive shaft 1 includes a drive connecting shaft 1-1, a center shaft drive assembly 1-2, and a rear wheel shaft drive assembly 1-3. A drive shaft housing 1-4 is disposed externally to the drive connecting shaft 1-1. The center shaft drive assembly 1-2 includes a first passive drive housing 1-2-1 and a first passive gear 1-2-2. The rear wheel shaft drive assembly 1-3 includes a second active drive housing 1-3-1 and a second active gear 1-3-2. The first passive drive housing 1-2-1 and the second active drive housing 1-3-1 are integrally formed with the drive shaft housing 1-4 and are divided into a left housing and a right housing along the centerline of the drive connecting shaft 1-1.

[0136] The chainless transmission shaft tri-folding bicycle described in the above embodiment adopts a transmission shaft for transmission, which avoids the maintenance of chain transmission, is easy and convenient to pedal, is more compact when folded, and is more convenient and easy to carry.

Claims

1. A three-fold bicycle without chain drive shaft, characterized in that include: A main frame, wherein the main frame is provided with a central axis component and a foldable front wheel (10), a rear wheel (11) and a handlebar (4); A transmission shaft (1) is arranged between the middle shaft component and the rear wheel (11) in a transmission manner for transmitting power; wherein, One end of the transmission shaft (1) connected to the central axis component can be rotated and folded with the central axis component as the rotation center.

2. The chainless transmission shaft tri-folding bicycle according to claim 1, characterized in that: The rotational folding includes rear wheel straight folding and rear wheel angled folding.

3. The chainless transmission shaft tri-folding bicycle according to claim 2, characterized in that: The rotational folding is achieved by a rotating member (8-1) provided in the central axis component, wherein the rotating member (8-1) is arranged to rotate coaxially with the central axis in the central axis component or to rotate parallel to the central axis.

4. The chainless transmission shaft tri-folding bicycle according to claim 3, characterized in that: The central axis component comprises a support seat (8) connected to the main frame, a central axis assembly arranged inside the support seat (8), and the rotating member (8-1) is sleeved inside the support seat (8) and rotates relative to the support seat (8), or the rotating member (8-1) is rotationally connected to the support seat (8).

5. The chainless transmission shaft tri-folding bicycle according to claim 4, characterized in that: The transmission shaft (1) is connected to the rotating member (8-1), and the transmission shaft (1) is rotated and folded with the rotating member arranged coaxially or parallel to the central axis as the rotation center, so that the front wheel (10) and the rear wheel (11) are staggered and folded.

6. The chainless transmission shaft tri-folding bicycle according to claim 3, 4 or 5, characterized in that: The rotating member (8-1) comprises a coaxial rotating member and an angular rotating member. The straight folding of the rear wheel is achieved by the coaxial rotating member, and the oblique folding of the rear wheel is achieved by the angular rotating member.

7. The chainless transmission shaft tri-folding bicycle according to any one of claims 1 to 5, characterized in that: The transmission shaft (1) is connected to the center shaft component by a gear transmission, and the transmission shaft (1) is connected to the rear wheel (11) by a gear transmission.

8. The chainless transmission shaft tri-folding bicycle according to any one of claims 1 to 5, characterized in that: The main frame comprises a main beam frame (2), a rear support frame (16) and a front support frame. The rear wheel (11) is detachably connected to the main beam frame (2) via the rear support frame (16), so that the rear wheel (11) is in a folded or unfolded state; the front wheel (10) is foldably or detachably connected to the main beam frame (2) via the front support frame, so that the front wheel (10) is in a folded or unfolded state.

9. The chainless transmission shaft tri-folding bicycle according to claim 8, characterized in that: The front support frame comprises a front frame (3) and a front fork (5), wherein the front fork (5) is a double-arm structure or a single-arm structure; the rear support frame (16) is a double-arm structure or a single-arm structure.

10. The chainless transmission shaft tri-folding bicycle according to claim 8, characterized in that: The rear support frame (16) and the main beam frame (2), as well as the front wheel (10) and the main beam frame (2), are detachably connected via quick-detachment components.

11. The chainless transmission shaft tri-folding bicycle according to claim 8, characterized in that: The rear support frame (16) is also provided with a pushing assembly (18) for pushing the bicycle after folding. The pushing assembly (18) comprises a pushing frame (18-1) and a pushing wheel (18-2).

12. The chainless transmission shaft tri-folding bicycle according to any one of claims 1 to 5, characterized in that: The front wheel (10), rear wheel (11) and handlebar (4) are folded or unfolded by using a folding assembly (6); the folding assembly (6) includes a trapezoidal folding assembly and a conical folding assembly; and a lock buckle for detachably fastening to the folded rear wheel (11) is also provided on the front wheel axle assembly (14) of the front wheel (10).

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