阅读说明：本技术 自转折叠轮自行车 (Bicycle with self-rotating folding wheels ) 是由 陆修义 于 2021-08-21 设计创作，主要内容包括：自转折叠轮自行车包括轮圈段、轮圈连接装置、双剪刀叉支架、前车轴装置、后车轴装置和浮动中轴装置；所述的轮圈段通过轮圈连接装置连接成封闭的车轮构件,所述的轮圈段两端的轮圈连接装置与双剪刀叉支架铰接相连,所述的双剪刀叉支架通过支架座分别与前车轴装置、后车轴装置活动连接；所述的后车轴装置通过支架座带动浮动后横梁与浮动中轴装置连接。利用地面摩擦力矩作用,可实现手握闸把前推自行车,轮圈快速展开并自动锁紧,后推自行车,轮圈快速折叠,特别方便。自转折叠轮自行车在满足大轮子行驶速度性和稳定性的同时,又缩小了折叠后的携带存放空间。轮胎和车架不用分开存放,且有不怕扎胎等特点,值得大力推广。(The autorotation folding wheel bicycle comprises a wheel ring section, a wheel ring connecting device, a double-scissors fork bracket, a front axle device, a rear axle device and a floating middle axle device; the wheel rim sections are connected into a closed wheel component through wheel rim connecting devices, the wheel rim connecting devices at two ends of the wheel rim sections are hinged with double-shear fork brackets, and the double-shear fork brackets are respectively movably connected with the front axle device and the rear axle device through bracket seats; the rear axle device drives the floating rear cross beam to be connected with the floating middle shaft device through the bracket seat. The brake handle can be held by hand to push the bicycle forward by using the action of ground friction torque, the wheel rim can be unfolded quickly and locked automatically, the bicycle can be pushed backwards, and the wheel rim can be folded quickly, so that the bicycle is very convenient. The bicycle with the autorotation folding wheels has the advantages that the traveling speed and the stability of the large wheels are met, and meanwhile, the carrying and storing space after the bicycle is folded is reduced. The tyre and the frame do not need to be stored separately, and the tyre is not easy to prick, so the tyre is worth being widely popularized.)

1. The autorotation folding wheel bicycle comprises a wheel ring section, a wheel ring connecting device, a double-shear fork bracket, a front axle device, a rear axle device and a floating middle axle device; the wheel rim sections are connected into a closed wheel component through wheel rim connecting devices, the wheel rim connecting devices at two ends of the wheel rim sections are hinged with double-shear fork brackets, and the double-shear fork brackets are respectively movably connected with the front axle device and the rear axle device through bracket seats; the rear axle device drives the floating rear cross beam to be connected with the floating middle shaft device through the bracket seat.

2. The autorotation folding wheel bicycle as claimed in claim 1, wherein the number of the rim sections is even, the rim sections comprise end welding end sockets, middle welding flat end sockets, inflation-free hollow tire sections and rim arc sections, the inflation-free hollow tire sections are clamped in clamping grooves of the rim arc sections, and two ends of the inflation-free hollow tire sections are fixedly connected with the rim arc sections through the end welding end sockets and the middle welding end sockets.

3. A spinning folding wheel bicycle as claimed in claim 2, characterized in that adjacent rim sections are connected by corner retainers through swivel pins, and the included angle of the central axis of the pin hole in the plane perpendicular to the axle axis is equal to the central angle of the arc section of the rim after being unfolded.

4. A self-rotating foldable wheel bicycle as claimed in claim 2, wherein the rim section is divided into two sections rotatably connected from the middle, and the middle of the rim section is fixedly connected with a set of rim middle welding flat heads; the two opposite welding flat heads are hinged through a pin shaft, the wheel rim can be folded inwards around the pin shaft in the unfolding or folding process, and after the wheel rim is unfolded, the end faces of the two opposite welding flat heads are abutted.

5. The autorotation folding wheel bicycle according to claim 2, wherein the welding end socket comprises a welding end socket, a welding end socket plate and a welding end socket sleeve, the end face of the end welding end socket is in a semi-arc and semi-plane structure, the vertical distance from the straight edge of the bottom of the end welding end socket to the center of the rotating pin of the corner retainer is half width of the end socket, the radius of the arc is slightly larger than half width of the end socket, the end face of the middle welding end socket is in a plane structure, and two ends of the inflation-free hollow tire section are fixedly connected with the arc section of the wheel rim through the end welding end socket sleeve, the middle welding end socket sleeve.

6. The self-rotating folding wheel bicycle as claimed in claim 2, wherein the two ends of the arc section of the rim are supported by brackets, the brackets are asymmetric double-scissors fork bracket hinge mechanisms, the middle part of the double-scissors fork bracket is enclosed into a parallelogram, and after the wheel is completely unfolded, the inner edges of the parallelogram in the middle part of the double-scissors fork bracket are attached together to form a radius part of the rim; when the rim is completely folded, the inner edges of the parallelogram are attached together to limit the folded rim.

7. An autorotation folding wheel bicycle according to claim 6 characterized in that said double scissor fork supports comprise a double plate inner support, a single plate outer support, a single plate inner support and a double plate outer support; the single plate bracket is clamped between the double plate brackets and is hinged with the double plate brackets; the outer end of the double-plate outer support is hinged with the corner retainer, the outer side of the double-plate outer support is fixedly connected with a limiting block, and when the wheel rim section is completely unfolded, the side face of the corner retainer is limited by the limiting block; the corner retainer prevents the rim from deflecting left and right by limiting the rotating pin direction of the rim welding end socket; the distance between the center of a pin hole, which is hinged between the corner retainer and the double-plate outer bracket, and the side surface of the corner retainer is equal to the arc radius of the end part of the double-plate outer bracket; the inner end holes of the single-plate inner support and the double-plate inner support plate are fixedly connected with support pins through interference fit, and the support pins are arranged in transverse U-shaped clamping grooves in the support base.

8. The self-rotating folding wheel bicycle as claimed in claim 7, wherein the stand base is installed with a longitudinal through groove for the rotation of the inner stand plate and a transverse U-shaped groove for receiving the support pin of the stand, the width of the through groove is matched with the thickness of the inner stand plate, and the arc of the U-shaped groove is matched with the support pin; the outer sleeve of the bracket seat is provided with a longitudinal groove for the rotation of the inner bracket plate; the bracket seat outer sleeve is circumferentially limited to the bracket supporting pin.

9. An autorotation folding wheel bicycle as claimed in claim 7, characterized in that said double plate inner rack and said single plate inner rack are installed oppositely in the left and right rack holders or said double plate inner rack and said single plate inner rack are installed at intervals in the rack holders on the same side; after installation, the single plate bracket is clamped between the double plate brackets and hinged, and the left and right outer bracket plates are both double plate outer brackets and are connected with the corner retainer.

10. An autorotation folding wheel bicycle according to claim 7, characterized in that two circular rollers are arranged in the bracket base, and the circular rollers move in the double helical grooves on the left side and the right side of the shaft sleeve and drive the bracket base and the double scissors fork bracket to move in a left-right crossing way.

11. The bicycle with self-rotating folding wheels as claimed in claim 10, wherein the shaft sleeve is formed with double helical grooves on both sides, the helical grooves extend from the middle of the shaft sleeve to both ends symmetrically, the helical grooves are variable lead helical grooves, and the helical grooves are connected by two sections of grooves with large and small lead angles.

12. The bicycle with self-rotating folding wheels as claimed in claim 11, wherein the left end of the shaft sleeve is provided with an end groove, and the shaft sleeve is matched with the inner tongue of the butterfly brake fixing disc to transmit the torque of the butterfly brake disc; the shaft sleeve is connected with the axle through a ball stop, a steel ball and a steel bowl.

13. The self-rotating folding wheel bicycle as claimed in claim 1, wherein the rear axle device comprises a support base, a flywheel and a floating rear cross member mechanism, the flywheel and the floating rear cross member mechanism are mounted on the support base, and the flywheel and the floating rear cross member mechanism move left and right along with the support base.

14. The self-rotating folding wheel bicycle as claimed in claim 13, wherein the floating rear beam mechanism comprises a bearing housing and a rear beam, the floating rear beam is fixed with a slide seat on the front bearing housing, the fixed angle between the slide seat and the rear beam is the same as the angle between the rear beam and the bicycle stand, the floating rear beam mechanism is connected with the bracket seat through the rear end of the bearing, and the front end of the floating rear beam mechanism is connected with the crank housing.

15. An autorotation folding wheel bicycle according to claim 13, characterized in that the front bearing housing of the floating rear beam is fixedly connected with a sliding plate seat, the bicycle vertical beam is provided with a half-and-half sliding sleeve, and the left and right sliding plates are connected with the sliding plate seat and the half-and-half sliding sleeve in a hinged manner.

16. An autorotation folding wheel bicycle according to claim 13, characterized in that the floating rear cross beam comprises a floating left rear cross beam and a floating right rear cross beam, the floating left rear cross beam is of a straight beam structure, the floating right rear cross beam is of an inner and outer inclined structure, and the inclination amplitude is the thickness of the flywheel.

17. The self-rotating folding wheel bicycle as claimed in claim 1, wherein the floating middle shaft structure comprises a left half shaft, a middle square core shaft, a right half shaft, a ball frame and a ball frame sleeve; the left half shaft and the right half shaft are respectively provided with a longitudinal groove matched with the square core shaft from the inner end part, and the root part of the longitudinal groove is provided with a symmetrical inclined plane. The square core shaft is respectively inserted into the grooves of which the left half shaft and the right half shaft are crossed into a cross shape; the two ends of the square mandrel are processed into four-side sloping platforms which are matched with the sloping surfaces of the grooves, the two adjacent sides of the square mandrel are respectively processed with a straight key groove, a short groove is processed in the direction which is vertical to the middle surface of the grooves at the inner ends of the left half shaft and the right half shaft, a hook head key is fixedly installed in the short groove, and the hook head of the hook head key is inserted into the straight key groove of the square mandrel and can slide in the straight key groove; the hook head key can hook the tail end of the straight groove which is not milled through.

18. A self-rotating foldable-wheel bicycle as claimed in claim 17, wherein the ball frame and the ball frame sleeve are fixed in the stand connecting sleeve by a limit round nut; the inner grooves of the left limiting round nut and the right limiting round nut are provided with dustproof rubber rings; the left half shaft and the right half shaft of the floating middle shaft are connected with a square core shaft to float or rotate in the ball frame; the left half shaft and the right half shaft of the floating middle shaft close to the outer end part are inserted into square holes of the crank sleeve in a four-way mode, and the outer end of the floating middle shaft is fixed with the crank sleeve through round nuts; the right crank sleeve is provided with a chain disc and a protective disc, and floats together with the chain along with the floating rear cross beam.

Technical Field

The invention relates to the technical field of bicycles, in particular to a bicycle with autorotation folding wheels.

Background

Along with the improvement of the requirements of people on the living quality, the practical, convenient, exquisite and perfect requirements on products are higher. At present, most of bicycles in the world cannot perfectly take the riding speed, stability and storage and carrying convenience into consideration. Folding bicycles are often folded only by selecting a folding frame, and the folding degree is also limited by the size of the wheels. The wheel is big then ride speed nature and stability are good, but deposit and carry occupation space great, and the wheel is little then deposit convenient to carry but ride speed nature and stability are poor. There are few designs for wheel folding, and even designs associated with wheel folding tend to be unsatisfactory. For example, a patent ZL201210579152.2 foldable wheel invented by Zun Zungui and Sce for years is complex in mechanism and large in part processing difficulty, and the unfolding and folding can be realized by a manual clamping bolt. In recent years, the foldable tire Revolve designed by Andrea Mocellin abroad is introduced on the Internet, although the target is relatively ideal, the tire sections of the hexagonal support structure are not connected continuously, the empty spaces among the tire sections are formed by additionally backfilling the separated tire sections from the other side to form a whole circle instead of integrally connected foldable unfolding wheels, the connection is discontinuous and not compact, the folding deformation is scattered, and the backfilling is easy to block. The manual folding and the installation are troublesome. The most important is that the wheels and the frame must be disassembled for separate storage, and the use and installation are very inconvenient. Because the effective combination of the foldable wheels and the vehicle body chain is not solved, and the solution of interference on the position of the chain after the wheels are folded and widened is not provided, the foldable wheels can only be stored in a split mode. Meanwhile, although the spokes of the scissors are also in a cross structure, the single-stage scissors fork structure also limits the space proportion of folding and scaling, namely, the wheels are folded to reduce the diameter, the width of the folded wheels and axles is greatly increased, and the scissors actually still occupy a lot of effective storage space and are still unfavorable for storage and carrying. A tire with a single arc would not be of great value to the market if it could not be effectively integrated with a vehicle frame. Because of practical limitation, the tire is only a concept tire at present.

Disclosure of Invention

Aiming at the problems, the invention discloses an autorotation folding wheel bicycle, namely, a brake handle is held by a hand, the bicycle is pushed forwards, the wheel can be unfolded by rotating for about one circle, and the bicycle can be ridden by loosening the brake handle; the bicycle is pushed after the brake handle is held by hand, the wheel is overturned for a circle, the wheel can be folded, and the bicycle can be pushed and pulled to any place to be stored after the brake handle is loosened.

In order to solve the technical problem, the invention adopts the following technical scheme:

the invention provides an autorotation folding wheel bicycle, which comprises a wheel ring section, a wheel ring connecting device, a double-scissors fork bracket, a front axle device, a rear axle device and a floating middle axle device, wherein the front axle device is connected with the front axle device; the wheel rim sections are connected into a closed wheel component through wheel rim connecting devices, the wheel rim connecting devices at two ends of the wheel rim sections are hinged with double-shear fork brackets, and the double-shear fork brackets are respectively movably connected with the front axle device and the rear axle device through bracket seats; the rear axle device drives the floating rear cross beam to be connected with the floating middle shaft device through the bracket seat.

In order to meet the requirements of speed performance and stability of a large wheel and portable storage of a folded small wheel when a bicycle is ridden, the wheel is divided into a plurality of proper rim sections with even number n, the rim sections are connected through a rim connecting device, a corner retainer of the rim connecting device is provided with a rotating pin, the rotating pin is hinged with a welding end socket at the end part of the rim section, and the corner retainer is connected with an axle device through a two-stage scissor fork support structure. The corner retainer ensures that the expanding and contracting process of the rim always meets the requirement of circumferential motion of expanding and contracting from the center of the wheel shaft. The outside of the front and rear axle of the bicycle is wrapped with a shaft sleeve, the two ends of the shaft sleeve are connected with the axle through a steel bowl, a ball and a ball stopper, and the left end of the shaft sleeve is connected with a butterfly brake fixing disc and a butterfly brake disc through end grooves. Two spiral grooves or variable spiral grooves are respectively processed on the left and right outside the shaft sleeve, the rotating directions of the left and right spiral grooves are opposite, and the left and right spiral grooves symmetrically extend from the middle part of the shaft sleeve to two ends. The bracket base is connected with the shaft sleeve by rolling in the spiral groove through the cylindrical roller. The support moves left and right along with the spiral rotation of the support base, and then drives the two ends of the coil section to move left and right, so that the contraction and the expansion are realized. The floating rear cross beam driven by the bracket seat of the rear wheel device is connected with the floating middle shaft in a floating way, the floating middle shaft ensures that the floating position of the chain meets the requirements of unfolding and shrinking of the wheels, and the sliding plate mechanism of the floating middle shaft ensures the centering and synchronization of the left rear cross beam and the right rear cross beam.

In order to realize the functions, the rim of the autorotation folding wheel bicycle consists of a plurality of even number n circular arc rim sections, and the even number n generally ranges from 6 to 12. The two ends of each rim section are provided with end welding end sockets of a semi-plane semi-arc surface, and the middle part of each rim section is provided with a middle welding end socket of a flat end surface. Explanation: 1. the number of n is less, so that the number of components is reduced, the installation is simple, and the length of the folded wheel ring section is longer than that of the folded axle; if the number of n is more, the number of components is increased, the installation is troublesome, but the length of the folded wheel ring section is shorter than that of the folded axle. 2. Although the middle of each rim section is provided with the middle welding flat head which is hinged and can be folded inwards, the rim sections are integrally rotated and folded and are connected with the rim connecting devices at the two ends, so that the wheel rim section can be still used as a rim section.

The wheel rim section comprises an inflation-free hollow tire, a wheel rim arc section, a wheel rim end welding end socket, a positioning screw, a middle welding end socket, a connecting pin and a clamp spring. The two ends of the rim are provided with end welding seal heads, the ends of the welding seal heads are in a semi-plane semi-arc surface structure, the vertical distance from the bottom straight edge of the semi-plane of the end to the center of the rotating pin of the corner retainer is half of the width of the seal head seat, and the radius of the arc of the end is slightly larger than the half of the width of the seal head seat. The half-plane of the end seal head ensures that the adjacent end seal head end faces are tightly attached after the wheel is unfolded, the limiting wheel ring section does not rotate around the rotating pin after being unfolded into a wheel, and the half-arc surface ensures that the wheel ring section is not blocked when being folded and rotated. The inflation-free hollow tire section is clamped in the limiting clamping groove of the rim and is inserted into the end enclosure sleeve through tire holes at two ends for fixing.

The end welding end sockets of the wheel ring section are composed of a welding end socket seat, a welding end plate and a welding end socket cover, the end welding end sockets are fixed at two ends of the wheel ring section in a welding mode and the like, the end welding end sockets are required to be relatively fixed left and right, namely if the semi-arc surface of one end socket is on the left, the semi-arc surface of the other end socket is on the right.

The wheel rim section is divided into two sections which can be rotatably connected from the middle in order to avoid the phenomenon of clamping the outer support of the double-scissors fork moving left and right, a middle welding flat head is fixed at the middle part, the two opposite welding flat heads are hinged through a connecting pin shaft, the wheel rim can be folded inwards around the connecting pin shaft in the unfolding or folding process, and the end faces of the two flat heads are propped together after the wheel rim is unfolded.

In the wheel rim section, the welding end socket at the end part is connected with the corner retainer through a rotating pin, and the rotating pin can rotate in a rotating pin hole of the corner retainer. The angle between the central lines of the two rotating pin holes of the corner retainer in a plane perpendicular to the axle is 360 degrees/n, so that the angle of the two rotating pins is always 360 degrees/n, and the fact that the circumferential movement of the wheel rim section which is zoomed in and out on the axle center is always prevented from being blocked in the unfolding and shrinking rotating process is guaranteed.

The two-stage scissor fork support device is used as a support mechanism of the wheel rim and is formed by mutually hinging a double-plate inner support, a single-plate outer support, a single-plate inner support and a double-plate outer support. The single plate is hinged between the double plates. The double-plate outer support is hinged with the corner retainer, the corner retainer after the wheel rim is unfolded is positioned through the positioning block of the double-plate outer support, the left and right deflection of the corner retainer is prevented, and the left and right deflection of the wheel rim after the wheel rim is unfolded is prevented by limiting the left and right swinging of the corner retainer and a rotating pin of the wheel rim end socket.

The distance between the center of the pin hole and the side face of the corner retainer is equal to the end arc radius Rw of the double-plate outer support, so that the double-plate outer support always abuts against the side face of the corner retainer in the rotating process, the corner retainer is prevented from being inclined left and right in the wheel rim folding and unfolding process, and the corner retainer is connected with the double-plate outer support more compactly and stably.

The secondary scissor fork support structure is a non-bilateral symmetry structure. The middle part of the double-scissors fork support can be enclosed into a parallelogram, and the inner edges of the parallelogram can be attached into a whole when the rim section is completely unfolded through optimized design. The double-plate outer support is hinged with corner retainers at two ends of the wheel rim section, plays a role in supporting two ends of the wheel rim section and can pull or push the wheel rim to fold and unfold.

In the two-stage scissor fork support structure, the inner support hole is fixed with the support pin through interference fit, the support pin is clamped in the transverse U-shaped clamping groove in the support seat, the radius of the bottom of the U-shaped clamping groove is consistent with that of the support pin, and the support pin can rotate in the U-shaped clamping groove. The support pin chamfer edge is basically consistent with the support base excircle but does not exceed the support base excircle, and the support pin is circumferentially limited by the support base outer sleeve outside the clamping groove. Specifically, the support base is provided with a through groove for rotating the support plate and a transverse U-shaped clamping groove for placing the support pin, the width of the through groove is the same as or equal to the thickness of the support plate, the support plate can be guaranteed to rotate, too many gaps are not generated, similarly, a longitudinal groove matched with the support base is also machined in the support base outer sleeve, and the support base outer sleeve is fixed on the support base through screws so as to limit the circumferential position of the support pin.

In the second-stage scissor fork support, the double plates and the inner support of the single plate are oppositely arranged in the left support base and the right support base, and are arranged at intervals in the support bases on the same side, namely the outer support plate is finally kept to be connected with the corner retainer through the double-plate outer support after being arranged.

When the rim is completely unfolded, the inner edges of a parallelogram formed by the middle part of the secondary scissor fork support are tightly attached and are clasped together to form the radius of the spoke of the wheel; when the folding wheel is completely folded, the inner edges of the parallelogram surrounded by the middle part of the folding wheel can be attached together, and the folding wheel plays a limiting role.

The bracket base connected with the two-stage scissor fork bracket is internally provided with two circular rollers, the circular rollers move in a double-spiral groove outside the shaft sleeve, and the movement of the circular rollers in the double-spiral groove drives the left bracket base and the right bracket base to move left and right on the shaft sleeve relatively.

The axle sleeve wraps the outside of the axle, and two ends of the axle sleeve are connected with the axle through a steel bowl, a ball and a ball retainer. The axle sleeve left end is stopped fixed disk and butterfly through the end groove and is stopped the dish and link to each other. The shaft sleeve end slot can receive the torque transmitted by the inner tongue of the disc brake fixing disc. Two spiral grooves or variable spiral grooves are respectively processed on the left and right outside the shaft sleeve, the rotating directions of the left and right spiral grooves are opposite, and the left and right spiral grooves symmetrically extend from the middle part of the shaft sleeve to two ends. The middle part processing has the circumference arch, and the circular arch in the middle of the axle sleeve is only when being convenient for when spiral groove about processing begins bilateral symmetry location and equipment or dismantles the fore-and-aft axle from the middle part when preventing that each on the axle sleeve from controlling the cluster and move, explains: the lengths of the left and right portions of the boss are not necessarily equal due to the installation of the flywheel, etc.

The front and back double spiral groove structure of the axle sleeve extends from the middle part to the left and right ends symmetrically. The spiral groove structure with variable lead can be optimized, namely the spiral groove is formed by connecting two sections of large lead angle and small lead angle. The variable-lead spiral groove is convenient for the round roller to drive the support base to reduce the axial moving resistance when the rim is contracted and for the round roller to be firmly wedged and self-locked in the spiral groove after the round roller is completely unfolded.

The axle device of the bicycle is characterized in that a floating rear cross beam and a flywheel are added to the rear axle device compared with a front axle device. The crossbeam and the flywheel are both fixed on the bracket base and move left and right along with the bracket base.

The floating rear cross beam comprises a floating left rear cross beam and a floating right rear cross beam, the floating left rear cross beam is of a linear structure, the floating right rear cross beam is of an inner and outer inclined structure, and the inclination amplitude is the thickness of the mounted flywheel. The floating rear cross beam comprises a bearing sleeve and a rear cross beam, and a sliding plate seat is fixed on the bearing sleeve at the front end of the rear cross beam. The front end of the rear cross beam is connected with the crank shaft sleeve through a bearing, and the rear end of the rear cross beam is connected with the bracket base through a bearing.

The rear cross beam, a connecting line between the vertical frame and a rear fork pivot form a stable triangle. Although the rear cross beam floats, the distance between the fulcrums is still ensured to be unchanged, so that the frame of the vertical beam and the rear fork cannot deform due to the floating of the rear cross beam.

In order to adapt to the change of the folding width of the rim section, the middle shaft is designed into a floating middle shaft device. The floating middle shaft device mainly adopts a sliding connection structure of a left half shaft, a middle square core shaft and a right half shaft. The left half shaft and the right half shaft are respectively provided with a longitudinal groove matched with the square core shaft from the inner end part, and the root part of the longitudinal groove is provided with a symmetrical inclined plane. The square core shafts are respectively inserted into the longitudinal grooves of which the left half shaft and the right half shaft are crossed into a cross. Two ends of the square core shaft are processed into four-side sloping platforms which can be matched with the slopes at the roots of the longitudinal grooves, two adjacent sides of the square core shaft are respectively processed with straight key grooves, and one end of each straight key groove cannot be milled through. And a short groove is processed in the direction perpendicular to the middle plane of the longitudinal groove at the end part of the half shaft, the hook head key is fixed in the short groove through a screw, and the hook head of the hook head key is inserted into the straight key groove of the square core shaft and can slide in the straight key groove. When the half shaft moves the farthest square mandrel to shift most, the hook head key can hook the tail end of the straight groove without milling, and the square mandrel can not be disengaged from one of the two half shafts all the time.

The floating middle shaft is fixed in the vertical frame connecting sleeve. The ball frame is embedded in a ball frame sleeve which is slightly longer than the ball frame. The ball frame sleeve is tightly embedded in the vertical frame connecting sleeve of the bicycle and is fixed left and right through a limiting round nut. The inner groove of the limiting round nut is provided with a dustproof rubber ring. The ball frame ensures the smooth in and out of the left half shaft and the right half shaft and the normal rotation motion after the left half shaft and the right half shaft enter.

The four sides of the left half shaft and the right half shaft close to the outer ends are inserted into the four side holes of the crank shaft sleeve and fixed together with the crank sleeve through round nuts, the left crank sleeve and the right crank sleeve are connected with the rear cross beam through bearings, and the right crank sleeve is provided with a chain disc and a protection disc.

And a sliding plate seat is fixed on the front end bearing sleeve of the rear cross beam, and the fixed angle alpha of the sliding plate seat on the rear cross beam is consistent with the angle alpha of the rear cross beam and the upright frame. The semi-sliding sleeve is arranged on the vertical frame, and the left and right sliding plates are connected with the sliding plate seat and the semi-sliding sleeve in a hinged mode.

The middle shaft floating device is characterized in that the left half shaft and the right half shaft are connected through a crossed universal joint, and are matched with a ball frame, so that the phenomenon of 'locking' caused by friction resistance and torque when the left half shaft and the right half shaft are driven by the rear cross beam to enter or exit is avoided. The synchronous stability that the rear cross beam moved about has been guaranteed to the slide, and then the synchronous stability of semi-axis removal about the guarantee, when playing middle rightting effect, has also avoided controlling the deformation of rear cross beam. The hook key avoids the phenomenon that the middle square mandrel deviates to one side half shaft and breaks away from the other half shaft when the left half shaft and the right half shaft are farthest apart.

In order to adapt to the change of the transverse folding and widening of the wheel rim section, the front fork and the rear fork are designed into widening structures, and the space for transversely folding and placing the wheel rim section can be contained in the front fork and the rear fork. In addition, the rear fork is widened and designed to pay attention to the requirement of riding space, for example, the rear fork is designed to be in an arc shape or an inclination angle is increased if necessary, and the phenomenon that the rear fork touches the heel in the riding process is avoided.

The working process is as follows: when a brake handle is held by hand, a brake holder locks a disc brake sheet fixed at the left end of a shaft sleeve, the shaft sleeve stops rotating, the bicycle is pushed to advance, firstly, a support seat moves in a large-lift-angle spiral groove through a circular roller by means of friction torque of the ground on a tire section, the support seat is driven to rotate around the shaft sleeve, the support seat drives a second-stage scissor fork to move left and right in a crossed mode to be close to the middle, and a double-plate outer support pushes a corner retainer to be close to the middle. When the double-scissors fork support pushes all the wheel ring sections on one circumferential surface, the planes of the wheel ring welding seal heads are tightly attached, the double-scissors fork support is embraced together to form a complete radius part of the wheel, and the positioning block of the double-plate outer support props against the side surface of the corner retainer to prevent the wheel ring from deflecting left and right. Meanwhile, the round roller in the bracket seat enters a spiral groove with a reduced helix angle to be wedged tightly, self-locking is realized through wedging friction force, and the bicycle can be ridden after the brake handle is loosened. And the brake in the riding process only strengthens self-locking and cannot be loosened.

The working process is as follows: when the bicycle is pushed backwards by holding the brake handle, the brake holder locks the disc brake disc fixed at the left end of the shaft sleeve, the front shaft sleeve and the rear shaft sleeve stop rotating, the circular roller in the bracket seat is unlocked in the spiral groove of the shaft sleeve, the bracket seat rotates outwards in a reverse spiral manner to drive the double-scissor fork bracket to move leftwards and rightwards, the double-plate outer bracket drives the corner retainer to pull the two ends of the wheel rim leftwards and rightwards respectively, and the wheel rim contracts. When the inner edges of the parallelogram enclosed by the middle of the double-scissors fork bracket are attached together, the wheel rim is transversely contracted and put in place. When the brake handle is released, the bicycle can be pushed and pulled to roll to any place with the wheel rim ball.

The invention has the beneficial effects that:

the bicycle frame and the tire are not required to be stored separately, the tire and the bicycle frame are not required to be assembled specially by hands, a certain clamping bolt or a switch device for unfolding and folding the front wheel and the rear wheel is not required to be pulled open by hands, the brake handle is held by hands to push the front wheel and the rear wheel for a short distance, the unfolding and the folding can be realized, the riding and the storage are very convenient, the inflation-free hollow tire is not afraid of tire puncture, the sealing head of the wheel rim section can prevent sundries on the road surface from entering the tire hole, the wheel rim section can be replaced conveniently without replacing the whole wheel, and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a longitudinal view of a front wheel assembly of the embodiment;

FIG. 2 is a cross-sectional view of the front wheel assembly of the embodiment in an expanded state;

FIG. 3 is a cross-sectional view of the front wheel assembly of the embodiment in a contracted state;

FIG. 4 is a schematic diagram of the rim of the embodiment shown in a contracted state;

FIG. 5 is a schematic connection diagram of a rim section, a rim end welding head, a rim middle welding head, and a rim connecting device according to an embodiment;

FIG. 6 is a schematic view of a rim end welding and sealing mechanism according to an embodiment;

FIG. 7 is a view of the structure of the end welding socket parts of the embodiment;

FIG. 8 is a part structure view of an end welding head plate of the embodiment;

FIG. 9 is a part configuration view of an end weld enclosure of an embodiment;

FIG. 10 is a part structure view of an arc section of a rim according to an embodiment;

FIG. 11 is a structural view of an inflation-free hollow tire of the embodiment;

FIG. 12 is a schematic view of an exemplary rim connecting device;

FIG. 13 is a component structure view of the corner holder of the embodiment;

FIG. 14 is a structural view of a pivot pin component of the rim connecting device of the embodiment;

FIG. 15 is a schematic view of a hinge mechanism of the embodiment with a welding head in the middle of a rim;

FIG. 16 is a view of the structure of a single lug flat head of the embodiment of the wheel rim with a welding head in the middle;

FIG. 17 is a view of the structure of the parts of the double-lug flat head of the welding head in the middle of the rim according to the embodiment;

FIG. 18 is a schematic view of a circumferential attachment structure of the stent of the embodiment;

FIG. 19 is a drawing of the embodiment 31, 32 bracket attachment;

FIG. 20 is a drawing of the embodiment 33, 34 with the bracket attached;

FIG. 21 is a schematic view of a front axle arrangement of the embodiment;

FIG. 22 is a component structure view of the disk brake mounting disk of the embodiment;

FIG. 23 is a part structure view of a holder base of the embodiment;

FIG. 24 is a diagram of stent holder cover component configurations according to an embodiment;

FIG. 25 is an expanded view of a spiral grooved sleeve of an embodiment;

FIG. 26 is a longitudinal view of the rear axle device of the embodiment;

FIG. 27 is an exploded cross-sectional view of the front axle assembly of the embodiment;

FIG. 28 is a cross-sectional view of the front axle assembly in a contracted state of the embodiment;

FIG. 29 is a schematic view of a rear axle arrangement of the embodiment;

FIG. 30 is a rear axle left bracket base parts construction of the embodiment;

FIG. 31 is a drawing of the rear axle right bracket base parts of the embodiment;

FIG. 32 is a floating left rear cross member configuration view of the embodiment;

FIG. 33 is a perspective view of the embodiment of the floating right rear cross member;

FIG. 34 is a block diagram of components of a welded slide plate carrier on a floating rear cross member according to an embodiment;

FIG. 35 is a cross-sectional view of the floating bottom bracket assembly of the embodiment in a collapsed riding mode;

FIG. 36 is a cross-sectional view of the embodiment of the floating bottom bracket assembly in an expanded configuration;

FIG. 37 is an exploded view of the middle part of the floating bottom bracket assembly of the embodiment;

FIG. 38 is a part construction view of the floating bottom bracket track slider of the embodiment;

FIG. 39 is a perspective view of the embodiment of the floating bottom bracket assembly showing the half runner assembly;

FIG. 40 is a schematic view of the connection of the rear axle assembly, the bottom bracket assembly, the floating rear cross member and the frame according to the embodiment.

Description of reference numerals:

1-wheel rim section, 2-wheel rim connecting device, 3-double scissors fork support, 4-front axle device, 5-rear axle device and 6-floating middle axle device;

the rim section 1 includes:

11-an inflation-free hollow tire section, 12-a rim arc section, 13-a rim end welding end socket, 14-a rim middle welding end socket and 15-a positioning screw;

131-welding a sealing head seat, 132-welding a sealing head plate, and 133-welding a sealing head sleeve;

141-single lug seat flat end socket, 142-double lug seat flat end socket, 143-connecting pin and 144-rim section clamp spring;

the rim connecting device 2 includes:

21-a corner retainer, 22-a rim connecting device rotating pin, 23-a rim connecting device gasket, 24-a rim connecting device nut and 25-a rim connecting device snap spring;

the double scissor fork mount 3 includes:

31-double-plate inner support, 32-single-plate outer support, 33-single-plate inner support, 34-double-plate outer support, 35-pair lock shaft position screws, 36-double-scissor bracket support pins, 341-double-scissor bracket limiting blocks;

the front axle device 4 includes:

41-front axle locking nut, 42-front axle ball stop, 43-front axle steel ball, 44-front axle steel bowl, 45-front axle screw, 46-front axle disc brake, 47-front axle disc brake fixed disc, 48-front axle screw II, 49-front axle support base outer sleeve, 410-front axle circular roller, 411-front axle support base, 412-front axle, 413-front axle spiral groove front axle sleeve;

the rear axle device 5 includes:

51-rear axle locking nut, 52-rear axle ball stop, 53-rear axle steel ball, 54-rear axle steel bowl, 55-rear axle screw, 56-rear axle disc brake, 57-rear axle disc brake fixed disc, 58-rear axle locking nut, 59-rear axle hole circlip, 510-rear axle bearing, 511-rear axle floating left rear cross beam, 512-rear axle screw, 513-rear axle bracket base coat, 514-rear axle round roller, 515-rear axle left bracket base, 516-rear axle, 517-rear axle spiral groove rear shaft sleeve, 518-rear axle right bracket base, 519-rear axle flywheel, 520-rear axle screw sleeve, 521-rear axle floating right rear cross beam;

the rear axle floating left rear cross member 511 includes:

5111-bearing housing, 5112-rear cross beam, 5113-sliding plate seat;

the rear axle floating right rear cross member 521 includes:

5211-bearing bush two, 5212-rear beam two, 5213-sliding plate seat two;

the floating middle shaft device 6 comprises:

61-left crank sleeve, 62-left half shaft of floating middle shaft, 63-round nut of floating middle shaft, 64-bearing of floating middle shaft, 65-elastic retainer ring for floating middle shaft hole, 66-lock nut of floating middle shaft, 67-rubber ring of floating middle shaft, 68-round nut of limit of floating middle shaft, 69-connecting sleeve of vertical frame of floating middle shaft, 610-ball frame sleeve of floating middle shaft, 611-ball frame of floating middle shaft, 612-chain plate of floating middle shaft, 613-protecting plate of floating middle shaft, 614-right half shaft of floating middle shaft, 615-hook key of floating middle shaft, 616-square core shaft of floating middle shaft, 617-screw of floating middle shaft, 618-screw of lock shaft of floating middle shaft, 619-slide plate of floating middle shaft, 620-half slide sleeve of floating middle shaft, 621-screw of lock shaft of floating middle shaft, 622-pedal, 623-right crank sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The following detailed description is made with reference to the accompanying drawings which illustrate design embodiments.

Fig. 1 to 40 show an embodiment of a bicycle with a self-rotating folding wheel, the effect of the design example of the invention is that the diameter of the self-rotating folding wheel is folded from phi 650mm to phi 310 mm. The attached drawings 5-11 and 15-17 mainly show a rim section structure, the attached drawings 12-14 mainly show a rim connecting device, the attached drawings 18-20 mainly show a support structure, the attached drawings 1-4 and 21-25 mainly show a front axle device, the attached drawings 26-34 mainly show a rear axle device, the attached drawings 35-39 mainly show a floating center shaft device, and the attached drawing 40 mainly shows the connection conditions of the rear axle device, the floating center shaft device and the floating rear cross beam with a frame.

The rim of the autorotation folding wheel bicycle is composed of a plurality of even number of circular arc rim sections, the example of the invention takes even number 10, the middle of the rim section is broken and is hinged together by a welding flat head and still used as a rim section, the central angle of the rim section after the wheel is unfolded is 360 degrees/10-36 degrees, the circular arc length of the rim section is 650 pi/10-204.1 mm, and the chord length of the outer circle section of the tire is 200.86mm, namely, the floating position of the folded chain is beyond the range of 100.43mm away from the center of the folding wheel.

As shown in fig. 5-11 and 15-17, the rim section 1 is composed of an inflation-free hollow tire section 11, a rim arc section 12, a rim end welding end enclosure 13, a positioning screw 15 and a rim middle welding end enclosure 14. End welding end sockets 13 are arranged at two ends of the wheel ring section 1, the end parts of the welding end sockets 13 are of a semi-plane semi-arc surface structure, the vertical distance from a straight edge of the semi-plane bottom of each end part to the center of a rotating pin of the corner retainer is half width W of the end socket 131, and the radius R of an arc of each end part is slightly larger than half width W of the end socket 131. In the embodiment of the invention, the width of the sealing head seat is 34mm, and W is 17 mm. The semi-plane surface of the seal head ensures that the adjacent seal head end surfaces are tightly attached after the seal head is unfolded, and the semi-arc surface ensures that the wheel ring section is not blocked when being folded and rotated.

The end welding end sockets 13 of the wheel ring section 1 are composed of a welding end socket seat 131, a welding end socket plate 132 and a welding end socket cover 133, the end welding end sockets 13 are fixed at two ends of the wheel ring arc section 12 in a welding mode and the like, the welding end sockets 13 are required to be relatively fixed left and right, namely if one end socket semi-arc surface is on the left side, the other end socket semi-arc surface is on the right side.

In order to avoid the phenomenon that the outer bracket 34 of the double scissors fork is propped by the wheel rim section 1 to be blocked when moving left and right, the wheel rim section 1 is divided into two sections which can be rotatably connected from the middle, and a group of wheel rim welding flat heads 14 are additionally arranged in the middle. The flat head 14 includes a single-lug flat head 141, a double-lug flat head 142, a connecting pin 143, and a rim section snap spring 144. The two opposite welding flat heads are hinged through a pin 143, and can be folded inwards around the pin in the unfolding or folding process. After the rim is unfolded, the end surfaces of the two flat seal heads are propped together.

The middle welding flat head 14 further comprises a second welding head seat, a second welding head plate and a second welding head sleeve; the difference between the welding head seat II, the welding head plate II and the welding head sleeve II and the welding head seat 131, the welding head plate 132 and the welding head sleeve 133 is that: the end surfaces of the welding head seat II, the welding head plate II and the welding head seat II are of a plane structure; the welding head seat 131 and the welding head seat II both comprise two lug holes, one lug hole of the welding head seat 131 is internally provided with threads, the other lug hole is a round hole, and the two lug holes of the welding head seat II are internally provided with no threads and are connected with the clamp spring through a connecting pin shaft.

The inflation-free hollow tire section 11 is clamped in a limiting clamping groove of the wheel rim arc section 12, the end socket sleeve 132 of the end welding end socket and the end socket sleeve of the middle welding end socket are inserted through the tire hole for fixing, and road surface sundries are prevented from entering the tire hole by the end welding end socket and the middle welding end socket.

As shown in fig. 12 to 14, the rim connecting device 2 is composed of a corner retainer 21, a rim connecting device rotating pin 22, a rim connecting device washer 23, a rim connecting device nut 24 and a rim connecting device snap spring 25. The included angle between the pin hole axes of the corner retainer 21 is 360 degrees/10 degrees to 36 degrees.

The angle of the two rotating pins is always kept at 36 degrees, and the two ends of the rim section rotate around the rotating pins with the included angle of 36 degrees, so that the rim section is ensured to always meet the requirement of not being blocked in the circumferential motion of the wheel shaft center scaling in the rotating process of expansion and contraction.

Referring to fig. 18-20, 2, 3, 21, and 27-29, the dual scissors fork support 3 mainly includes a dual-plate inner support 31, a single-plate outer support 32, a single-plate inner support 33, and a dual-plate outer support 34 hinged to each other. The single plate is hinged between the double plates. The double plate outer bracket 34 is hinged with the corner retainer 21 through a lock shaft position screw 35, and is positioned on the side surface of the corner retainer 21 after the wheel ring is unfolded through a positioning block 341 to prevent the corner retainer 21 from deflecting left and right, and prevent the wheel ring from deflecting left and right by limiting the corner retainer 21 and the wheel ring connecting device of the wheel ring head to prevent the rotating pin 22 from swinging left and right. Inner end holes of the inner supports 31 and 33 are fixed with double-scissors fork support supporting pins 36 through interference fit, the double-scissors fork support supporting pins 36 are placed in transverse U-shaped clamping grooves in the front axle support seat 411, and the outer portion of the inner supports is circumferentially limited by a front axle support seat outer sleeve 49. Specifically, as shown in fig. 23, 24, 30 and 31, the front axle bracket holder 411 is provided with a transverse U-shaped slot for receiving the support pin 36 of the double scissor bracket and a longitudinal through slot for rotating the inner bracket plates 31 and 33, the radius of the bottom of the U-shaped slot is consistent with the support pin, and the support pin can rotate in the U-shaped slot. The chamfered edges of the support pins 36 of the double scissors fork support are basically consistent with the excircle of the front axle support seat 411 but not exceeding the excircle of the support seat, and the width of the longitudinal through groove is the same as or equal to the thickness of the inner support plates 31 and 33, so that the support plates can rotate and too many gaps are not generated. Similarly, the front axle bracket holder outer sleeve 49 is also provided with a longitudinal groove matching with the bracket holder, and the front axle bracket holder outer sleeve 49 is fixed on the front axle bracket holder 411 through a front axle disc brake screw II 48 to limit the circumferential position of the bracket double scissor bracket support pin 36.

The connection mode of the rear axle device 5 and the double-scissors fork bracket 3 is the same as that of the front axle device 4 and the double-scissors fork bracket 3.

Referring to fig. 2, 3, 27 and 28, the double scissors fork support 3 has a non-bilateral symmetrical structure. The middle part of the double-scissors fork support 3 is enclosed into a parallelogram, the inner edges of the parallelogram are attached to form the radius of the wheel integrally when the rim section is completely unfolded through optimized design, and the inner edges of the parallelogram can be also attached together when being folded, so that the folding position is limited.

The double plates of the second-stage scissor fork bracket 3 and the single-plate inner brackets 31 and 33 are oppositely arranged in the left bracket base and the right bracket base, and the left bracket base and the right bracket base are arranged at intervals in the same side, namely the left outer bracket plate and the right outer bracket plate are finally kept to be connected with the corner retainer 21 through the double-plate outer bracket 34 after the installation.

As shown in fig. 13, 20, 21 and 29, the distance between the center of the pin hole hinged to the side surface of the corner holder 21 and the double-plate outer holder 34 is equal to the end arc radius Rw of the double-plate outer holder 34, so that the double-plate outer holder 34 always abuts against the side surface of the corner holder 21 during the rotation process, thereby preventing the corner holder 21 from tilting left and right during the folding and unfolding of the rim, and enabling the connection between the corner holder 21 and the double-plate outer holder 34 to be more compact and stable.

The front axle support base 411 connected with the two-stage scissor fork support is internally provided with two front axle circular rollers 410 which move in a double-spiral groove outside an axle sleeve 413, and the movement of the circular rollers in the spiral groove drives the left and right front axle support bases 411 to move left and right on the axle sleeve 413.

The axle sleeve 413 is wrapped outside the axle 412, and two ends of the axle sleeve are connected with the axle 412 through the front axle steel bowl 44, the front axle steel ball 43 and the front axle locking ball catch 42. The left end of the shaft sleeve 413 is connected with the butterfly brake fixing disc 47 and the butterfly brake disc 46 through end grooves. The sleeve end slot may receive torque transmitted by the tongue in the front axle disc brake mounting disk 47. The left and the right outside the shaft sleeve are respectively provided with two spiral grooves. The middle part processing has the circumference arch, and the circular arch in the middle of the axle sleeve is only when being convenient for when spiral groove about processing begins bilateral symmetry location and equipment or dismantles the fore-and-aft axle from the middle part when preventing that each on the axle sleeve from controlling the cluster and move, explains: the lengths of the left and right portions of the boss are not necessarily equal due to the installation of the flywheel, etc.

As shown in fig. 25, the axle sleeve 413 has an outer helical groove having a double helical groove structure, and right and left helical grooves are oppositely formed and extend symmetrically from the middle portion to right and left ends. The variable-lead spiral groove is preferably of a variable spiral groove structure, namely the outer end of the shaft sleeve is milled into a large-lift-angle spiral groove 4131, the connected inner part is a small-lift-angle spiral groove 4132, and the variable-lead spiral groove is convenient for the round roller to drive the support base to move left and right when the rim is contracted and reduce the resistance and the wedging and self-locking of the round roller in the spiral groove are firmer after the round roller is completely unfolded.

As shown in fig. 25, in the embodiment of the present invention, the outer diameter of the sleeve is designed to be 30mm, the expanded circumference c of the sleeve is 30 pi, 94.2mm, and the lead angle of the large spiral groove is 30 °. As can be seen from the unfolded drawing, the moving distance L of the circular roller of the bracket seat is about one lead, namely the wheel ring can be unfolded or folded after rotating about one circle.

As shown in fig. 21 and 29, the rear axle device 5 is provided with a floating left rear cross member 511, a floating right rear cross member 521, and a rear axle flywheel 519 in addition to the front axle device 4. The left floating rear cross beam 511 is fixed on the shoulder of the rear axle bracket base 515 through the rear axle bearing 510 and the rear axle lock nut 58, and then the axle left bracket base 515 moves left and right together; the flywheel 519 is screwed on the external thread of the rear axle right bracket seat 518 through threads, the rear axle thread insert 520 and the rear axle lock nut are screwed on the external thread of the rear axle right bracket seat 518 through threads, the floating right rear cross beam 521 is fixed on the external thread of the rear axle right bracket seat 518 through a bearing, the rear axle thread insert 520 and the rear axle lock nut, and then the axle right bracket seat 518 moves left and right together.

Referring to fig. 32 to 34, in the floating rear cross member structure, the rear axle floating left rear cross member 511 is a straight beam, the rear axle floating right rear cross member 521 is an inner and outer inclined beam, and the inclination amplitude e is the thickness of the flywheel.

The floating rear cross beam structure 511 comprises a bearing sleeve 5111 and a rear cross beam 5112, wherein a sliding plate seat 5113 is fixed on the bearing sleeve at the front end of the rear cross beam. The fixing directions of the front bearing sleeve and the rear bearing sleeve are opposite. The front end of the rear cross beam is connected with the crank shaft sleeve 61 through a floating middle shaft bearing 64, and the rear end is connected with a bracket base 515 through a rear axle bearing 510.

The floating right rear cross beam structure 521 components and the connection mode are the same as the structure of the floating left rear cross beam 511 of the rear axle.

As shown in fig. 35-39, the center shaft is designed as a floating center shaft device 6 in order to adapt the chain and the chain wheel to the change of the folding width of the rim section. The floating middle shaft device 6 mainly adopts a sliding connection structure of a floating middle shaft left half shaft 62, a middle floating middle shaft square core shaft 616 and a floating middle shaft right half shaft 614. The left half shaft 62 and the right half shaft 62 are respectively provided with a longitudinal groove matched with the central shaft 616 of the floating central shaft from the inner end part, and the root parts of the longitudinal grooves are provided with symmetrical inclined planes. The floating middle shaft square core shaft 616 is respectively inserted into the longitudinal grooves which are crossed by the left half shaft 62 and the right half shaft 62. Two ends of the floating middle shaft square core shaft 616 are processed into four-sided oblique tables 6161 which can be matched with the oblique surfaces at the roots of the longitudinal grooves, two adjacent sides of the floating middle shaft square core shaft 616 are respectively processed with straight key grooves 6162, and one end of each straight key groove 6162 cannot be milled through. A longitudinal short groove 621 is machined in the direction that the inner end portion of the half shaft 62 is perpendicular to the middle plane of the longitudinal groove, a floating middle shaft screw 617 is used for fixing a floating middle shaft hook head key 615 in the short groove, the hook head of the floating middle shaft hook head key 615 is inserted into a straight key groove 6162 of a floating middle shaft square mandrel 616 and can slide in the straight key groove, the left half shaft and the right half shaft move outwards furthest, if the square mandrel deviates to one side most, the hook head can hook the tail end of the straight groove which is not milled through, and the square mandrel cannot be disengaged from one of the two half shafts all the time.

The floating bottom bracket structure must be fixed in the floating bottom bracket stand connecting sleeve 69. The floating center axle ball frame 611 is embedded in the floating center axle ball frame sleeve 610, and the floating center axle ball frame sleeve 610 is slightly longer than the floating center axle ball frame 611. The floating middle shaft ball frame sleeve 610 is tightly embedded in the floating middle shaft vertical frame connecting sleeve 69 of the bicycle and is fixed left and right through the floating middle shaft limiting round nut 68. The floating middle shaft limiting round nut 68 is internally provided with a dustproof floating middle shaft rubber ring 67. The floating center shaft ball frame 611 ensures smooth in-and-out of the left and right half shafts and normal rotation movement after entering.

The four-side parts of the left half shaft 62 and the right half shaft 62 close to the outer ends are inserted into the four-side holes of the crank sleeve 61 and are fixed with the crank sleeve 61 through a floating middle shaft round nut 63, the left crank sleeve 61 and the right crank sleeve 61 are connected with floating rear cross beams 511 and 521 through a floating middle shaft bearing 64, and a floating middle shaft chain plate 612 and a floating middle shaft protection plate 613 are arranged on the right crank sleeve 623.

A sliding plate seat 5113 is fixed on a front end bearing sleeve 5111 of the floating rear cross beam, and a fixed angle alpha of the sliding plate seat 5113 on the rear cross beam is consistent with an angle alpha of the rear cross beam and the vehicle vertical frame. The floating middle shaft half-and-half sliding sleeve 620 is arranged on the vertical frame, and the left floating middle shaft sliding plate 619 is connected with the sliding plate seat 5113 and the floating middle shaft half-and-half sliding sleeve 620 in a hinged mode.

The middle shaft floating device 6 is connected with the left half shaft and the right half shaft by a crossed universal joint, and is matched with a floating middle shaft ball frame 611, so that the phenomenon of 'locking' caused by friction resistance and torque action when the floating rear cross beam 511 drives the left half shaft and the right half shaft to enter or exit is avoided. The floating middle shaft sliding plate 619 ensures the synchronous stability of the left and right movement of the floating rear cross beam 511, so as to ensure the synchronous stability of the left and right half shaft movement, and also avoid the deformation of the left and right rear cross beams while playing a role in centering. The floating middle shaft hook key 615 prevents the middle floating middle shaft square core shaft 616 from deviating to one half shaft and separating from the other half shaft.

The floating rear cross beam forms a stable triangle with the connecting line between the vertical frame and the rear fork pivot. Although the rear cross beam floats, the distance between the fulcrums is still ensured, so that the frame deformation of the vertical beam and the rear upper fork due to the floating of the rear cross beam is avoided. In order to adapt to the change of the transverse folding and widening of the wheel rim section, the front fork and the rear fork are designed to be widened, and the space for transversely folding and placing the wheel rim section can be accommodated in the front fork and the rear upper fork. In addition, the rear fork is widened and designed to pay attention to the requirement of riding space, for example, the rear fork is designed to be in an arc shape or an inclination angle is increased if necessary, and the phenomenon that the rear fork touches the heel in the riding process is avoided.

In the embodiment of the invention, under the conservative design condition of ensuring the sufficient strength space size of the component, the unfolded diameter of the wheel is 650mm, the folded diameter is 310mm, the width of the wheel ring end socket is 34mm, the length of the front shaft is 312mm, the length of the rear shaft is 356mm, and the distance between the chain, the flywheel and the chain disc and the center of the frame is 47mm when the wheel is unfolded.

The operating principle of the rear axle device 5 of the present invention is the same as that of the front axle device 4, and therefore, the description thereof is omitted.

The unfolding working process of the invention is as follows: when holding the brake handle and promoting the bicycle and advancing, the brake holder lock and install the dish brake piece 46 at the axletree left end, the dish brake piece passes through front axle dish brake fixed disk 47 interior tongue at axletree axle sleeve 413 left end inslot transmission moment of torsion, let axle sleeve 413 stall, rely on ground to the friction torque of tire section, at first make front axle support seat 411 pass through front axle round roller 410 and move in big lift angle helicla flute, it rotates around axle sleeve 413 spiral to drive it, front axle support seat 411 drives about second grade scissors fork 3 the cross motion and is close to the middle part, biplate outer support 34 promotes angle holder 21 and draws close to the centre, explain: because the wheel ring section is divided into two sections which can be folded and rotated, the double-plate outer support 34 can not be pressed and clamped by the wheel ring section in the process of moving left and right. When the double-scissors fork support 3 pushes all the wheel rim sections 1 on one circumferential surface, the half planes of the wheel rim welding end sockets 13 are tightly attached, the double-scissors fork support 3 is clasped together to form the complete radius part of the wheel, and the positioning block 341 of the double-plate outer support 34 is propped against the side surface of the corner retainer 21 to prevent the wheel rim sections 1 from deflecting left and right. Meanwhile, the front axle round roller 410 in the front axle bracket seat 411 enters a spiral groove with a reduced helix angle for wedging, self-locking is realized through wedging friction force, and the bicycle can be ridden after a brake handle is loosened. The brake in the riding process only strengthens the self-locking and can not be loosened.

The folding working process of the invention comprises the following steps: when a hand is used for holding a brake handle to push a bicycle backwards, the brake holder is locked with a disc brake sheet 46 arranged at the left end of an axle, the disc brake sheet transmits torque in a groove at the left end of an axle sleeve 413 through an inner tongue of a front axle disc brake fixing disc 47 to stop the rotation of the front and rear axle sleeves 413, and a front axle circular roller 410 in a front axle support seat 411 is unlocked in a sleeve spiral groove by means of reverse friction torque of the ground on a tire section, the front axle support seat 411 rotates reversely and spirally outwards to drive a double-shear fork support 3 to move left and right, the double-plate outer support 34 drives a retainer corner 21 to pull the two ends of the wheel section 1 left and right respectively, and the wheel section 1 is contracted. When the inner edges of a parallelogram enclosed by the middle of the double-scissors fork bracket 3 are jointed together, the wheel ring section 1 is transversely contracted and folded in place. The chain, the chain wheel, the floating rear cross beam and the floating middle shaft move outwards together to leave the transverse rim. When the brake handle is released, the bicycle can be pushed and pulled to roll to any place with the wheel rim ball.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.