Multi-section telescopic mechanism for easy wheel and folding bicycle

Abstract

This utility model discloses an easy-to-drive multi-section telescopic mechanism and a folding bicycle. The easy-to-drive multi-section telescopic mechanism includes a first wheel, a second wheel, a connecting tube, a first telescopic rod, and a second telescopic rod. The first wheel and second wheel are spaced apart horizontally, and the connecting tube, the first telescopic rod, and the second telescopic rod all extend horizontally. The first wheel is connected to one end of the connecting tube. One end of the first telescopic rod extends into the connecting tube and can slide horizontally, allowing the other end of the first telescopic rod to extend horizontally relative to the other end of the connecting tube. The first telescopic rod is hollow. One end of the second telescopic rod extends into the first telescopic rod and can slide horizontally, allowing the other end of the second telescopic rod to extend horizontally relative to the other end of the first telescopic rod. The other end of the second telescopic rod is connected to the second wheel. Thus, the multi-section telescopic mechanism (two or more sections) satisfies the requirements of sufficient extension length and compact folding.

Description

Technical Field

[0001] This utility model relates to the field of folding bicycles, and in particular to an easy-drive multi-section telescopic mechanism and a folding bicycle. Background Technology

[0002] Currently, folding bicycles are popular. Their frames can be folded in both the front and rear, so when not in use, the folded bicycle takes up less space and is ideal for storage, management, and portability.

[0003] CN 205998059 U discloses a folding bicycle that is easy to push after folding, comprising a frame, a drive system, a braking system, and a folding support device; the front frame and the rear frame are connected by a foldable device; the folding support device includes support wheels, a support rod, and a support rod sleeve; there are two support wheels, which are respectively connected to the support rod via an axle and an axle seat; the lower end of the support rod is movably connected to the axle seat, and a bearing may be provided therein to facilitate free steering of the support wheels when pushed; the support rod sleeve is a sleeve that mates with the support rod, and the support rod sleeve is fixedly installed on the rear frame in the vertical direction; the support rod is inserted into the support rod sleeve, with its upper end protruding from the support rod sleeve, and the seat is installed on the upper end of the support rod; the support rod and... A support rod braking structure is provided between the support rod sleeves; the support rod braking structure includes a brake handle and a pull rod. One end of the brake handle is hinged to the support rod sleeve through a support, and the pull rod is connected between the brake handle and the support rod sleeve. A connecting support is also provided between the pull rod and the support rod sleeve; the support rod sleeves at the corresponding ends of the pull rod are provided with contraction grooves; when the brake handle is tightened, the brake handle locks the pull rod, and the contraction grooves on the support rod sleeve contract, so that the support rod sleeve can tightly fit the support rod. When the brake handle is loosened, the pull rod can be released, and the support rod can move up and down in the support rod sleeve to adjust the height of the support travel wheel. When riding, the support travel wheel can be raised without affecting riding. When pushing, the support travel wheel can be lowered by a distance L for easy pushing.

[0004] However, the folding support device of this type of folding bicycle is closely related to the frame structure. If this type of folding support device is used, it also means that the original frame structure needs to be adjusted and changed accordingly, which involves an increase in production costs and limits its promotion and application. Moreover, when pushing the bicycle after folding, the distance between the two wheels can only be adjusted very little, which will inevitably affect the stability when pushing it.

[0005] Therefore, it is necessary to research a new technical solution to address the above problems. Utility Model Content

[0006] In view of this, the present invention addresses the deficiencies of the existing technology, and its main purpose is to provide an easy-to-use multi-section telescopic mechanism and a folding bicycle. The multi-section telescopic mechanism meets the requirements of sufficient extension length and compact folding. Moreover, its structure is simple, easy to manufacture, easy to operate and use, and highly practical, making it suitable for widespread application in folding bicycles.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A multi-section telescopic mechanism for easy-moving wheels includes a first wheel, a second wheel, a connecting pipe, a first telescopic rod, and a second telescopic rod; wherein the first wheel and the second wheel are spaced apart to the left and right, and the connecting pipe, the first telescopic rod, and the second telescopic rod all extend to the left and right;

[0009] The first wheel is connected to one end of the connecting tube; one end of the first telescopic rod extends into the connecting tube and can slide left and right, so that the other end of the first telescopic rod extends and retracts left and right relative to the other end of the connecting tube; the first telescopic rod is a hollow rod, one end of the second telescopic rod extends into the first telescopic rod and can slide left and right, so that the other end of the second telescopic rod extends and retracts left and right relative to the other end of the first telescopic rod; the other end of the second telescopic rod is connected to the second wheel.

[0010] As a preferred embodiment, the other end of the second telescopic rod is directly connected to the second wheel;

[0011] or:

[0012] The other end of the second telescopic rod is connected to the second wheel via an extension telescopic mechanism. The extension telescopic mechanism includes a third telescopic rod. The second telescopic rod is a hollow rod. One end of the third telescopic rod extends into the second telescopic rod and can slide left and right, so that the other end of the third telescopic rod can extend and retract left and right relative to the other end of the second telescopic rod. The other end of the third telescopic rod is connected to the second wheel.

[0013] As a preferred embodiment, a first annular groove is provided on the inner wall surface of the connecting pipe near one end, and a second annular groove is provided near the other end. Both the first annular groove and the second annular groove are arranged around the outer periphery of the first telescopic rod.

[0014] The outer periphery of the first telescopic rod is provided with a first ball-shaped buckle assembly;

[0015] In the first usage state, the first telescopic rod is retracted into the connecting tube, and the ball of the first ball buckle assembly is engaged in the first annular groove.

[0016] In the second usage state, the first telescopic rod is pulled out from the connecting tube, and the ball of the first ball buckle assembly is engaged in the second annular groove.

[0017] As a preferred embodiment, the first ball buckle assembly is a double-headed ball structure, which includes a first spring and two first balls. The first spring is arranged radially along the first telescopic rod, and the two first balls are located at both ends of the first spring, protruding from the radially opposite sides of the outer periphery of the first telescopic rod.

[0018] As a preferred embodiment, a first radial hole is provided on the inner wall surface of the first telescopic rod near one end, and a second radial hole is provided near the other end; a second ball buckle assembly is provided on the outer periphery of the second telescopic rod.

[0019] In the first usage state, the second telescopic rod is retracted into the first telescopic rod, and the ball of the second ball buckle assembly is engaged in the first radial hole;

[0020] In the second usage state, the second telescopic rod is pulled out from the first telescopic rod, and the ball of the second ball buckle assembly is engaged in the second radial hole.

[0021] As a preferred embodiment, the inner wall of the first telescopic rod is provided with an axially extending guide groove, and the outer periphery of the second telescopic rod is provided with a guide protrusion. The guide protrusion is adapted to the guide groove. When the second telescopic rod extends or retracts relative to the first telescopic rod, the guide protrusion slides left and right along the guide groove.

[0022] As a preferred embodiment, the second ball buckle assembly is a double-headed ball structure, which includes a second spring and two second balls. The second spring is arranged radially along the second telescopic rod, and the two second balls are located at both ends of the second spring, protruding from the radially opposite sides of the outer periphery of the second telescopic rod.

[0023] A folding bicycle includes a frame and a front wheel and a rear wheel mounted on the frame. The frame includes a front frame and a rear frame. The front wheel is mounted on the front frame, and the rear wheel is mounted on the rear frame. The front frame and the rear frame are connected by a folding device. The frame is also provided with a support device to facilitate pushing the folded bicycle. The support device includes a multi-section telescopic mechanism for easy-drive wheels as described in any of the preceding claims.

[0024] As a preferred embodiment, the connecting tube is disposed inside the rear fork cross tube of the rear frame.

[0025] As a preferred embodiment, each end of the connecting tube is connected to a connecting piece; one connecting piece is connected to one end of the connecting tube and one end of the rear fork cross tube of the rear frame, and the other connecting piece is connected to the other end of the connecting tube and the other end of the rear fork cross tube of the rear frame, so that the connecting tube is externally fixed to the rear fork cross tube of the rear frame.

[0026] Compared with existing technologies, this utility model has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly meets the requirements of sufficient extension length and compact folding through a multi-section telescopic mechanism (two or more sections). Furthermore, its structure is simple, easy to manufacture, and easy to operate, making it highly practical and suitable for widespread application in folding bicycles. Secondly, the first telescopic rod uses a circumferential groove for positioning, while the second telescopic rod uses an axial groove for guidance and a radial hole for positioning. On the one hand, this allows the first telescopic rod to rotate smoothly for easy extension or retraction when it becomes stuck, ensuring precise telescopic positioning of the second telescopic rod. On the other hand, it allows for the installation of two or more telescopic mechanisms within a relatively small external diameter of the system, while also offering advantages such as ease of manufacturing and assembly, and convenient user operation.

[0027] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0028] Figure 1 This is a three-dimensional view (including the rear fork cross tube) of the multi-section telescopic mechanism of the easy-to-drive wheel according to Embodiment 1 of this utility model.

[0029] Figure 2 This is a cross-sectional view (including the rear fork cross tube) of the multi-section telescopic mechanism of the easy-to-drive wheel according to Embodiment 1 of this utility model.

[0030] Figure 3 This is another cross-sectional view (including the rear fork cross tube) of the multi-section telescopic mechanism of the easy-to-drive wheel according to Embodiment 1 of this utility model.

[0031] Figure 4 This is an exploded view (including the rear fork cross tube) of the multi-section telescopic mechanism of the easy-to-drive wheel according to Embodiment 1 of this utility model.

[0032] Figure 5 This is a schematic diagram of the state of the multi-section telescopic mechanism of the easy-to-drive wheel applied to the rear fork cross tube of the rear frame, according to Embodiment 1 of this utility model;

[0033] Figure 6 This is a three-dimensional view (including the rear fork cross tube) of the multi-section telescopic mechanism of the easy-to-drive wheel according to Embodiment 2 of this utility model.

[0034] Figure 7This is a cross-sectional view (including the rear fork cross tube) of the multi-section telescopic mechanism of the easy-to-drive wheel according to Embodiment 2 of this utility model.

[0035] Figure 8 This is an exploded view (including the rear fork cross tube) of the multi-section telescopic mechanism of the easy-to-drive wheel according to Embodiment 2 of this utility model.

[0036] Figure 9 This is a schematic diagram of the state of the multi-section telescopic mechanism of the easy-to-drive wheel applied to the rear fork cross tube of the rear frame, which is an embodiment of the present invention. Detailed Implementation

[0037] Please refer to Figures 1 to 9 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0038] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] A multi-section telescopic mechanism for easy-to-drive wheels includes a first wheel 1, a second wheel 12, a connecting pipe 6, a first telescopic rod 7, and a second telescopic rod 10; wherein the first wheel 1 and the second wheel 12 are spaced apart to the left and right, and the connecting pipe 6, the first telescopic rod 7, and the second telescopic rod 10 all extend to the left and right;

[0040] The first wheel 1 is connected to one end of the connecting pipe 6; one end of the first telescopic rod 7 extends into the connecting pipe 6 and can slide left and right, so that the other end of the first telescopic rod 7 extends and retracts left and right relative to the other end of the connecting pipe 6; the first telescopic rod 7 is a hollow rod, one end of the second telescopic rod 10 extends into the first telescopic rod 7 and can slide left and right, so that the other end of the second telescopic rod 10 extends and retracts left and right relative to the other end of the first telescopic rod 7; the other end of the second telescopic rod 10 is connected to the second wheel 12.

[0041] The other end of the second telescopic rod 10 is directly connected to the second wheel 12, thus the entire easy-to-drive multi-section telescopic mechanism adopts a two-section telescopic design; or: the other end of the second telescopic rod 10 is connected to the second wheel 12 through an extension telescopic mechanism, the extension telescopic mechanism including a third telescopic rod, the second telescopic rod 10 being a hollow rod, one end of the third telescopic rod extending into the second telescopic rod 10 and sliding left and right, so that the other end of the third telescopic rod extends and retracts left and right relative to the other end of the second telescopic rod 10; the other end of the third telescopic rod is connected to the second wheel 12. Thus, the entire easy-to-drive multi-section telescopic mechanism adopts a three-section or even more-section telescopic design.

[0042] On the inner wall of the connecting pipe 6, a first annular groove 14 is provided near one end, and a second annular groove 15 is provided near the other end. Both the first annular groove 14 and the second annular groove 15 are arranged around the outer periphery of the first telescopic rod 7. A first ball-bearing buckle assembly 8 is provided on the outer periphery of the first telescopic rod 7. The ball-bearing buckle assembly is a known structure, which typically includes a spring and a ball. The spring provides a radially outward force to the ball. When compressed, the ball moves radially inward, and the spring is compressed. When there is an external obstacle, such as the first annular groove 14, the ball protrudes outward under the force of the spring to lock into the first annular groove 14. The first ball-bearing buckle assembly 8 is a double-headed ball structure, which includes a first spring and two first balls. The first spring is arranged radially along the first telescopic rod 7, and the two first balls are located at both ends of the first spring, protruding from the radially opposite sides of the outer periphery of the first telescopic rod 7. Using two ball bearings at both ends allows the first telescopic rod 7 to have good concentricity during axial movement, thus ensuring stable positioning. In contrast, a single ball bearing is prone to large eccentric friction during operation, which can affect positioning accuracy. Long-term use can also affect positioning and cause jamming.

[0043] In the first usage state, the first telescopic rod 7 is retracted into the connecting pipe 6, and the ball of the first ball buckle assembly 8 is engaged in the first annular groove 14; in the second usage state, the first telescopic rod 7 is pulled out from the connecting pipe 6, and the ball of the first ball buckle assembly 8 is engaged in the second annular groove 15.

[0044] On the inner wall of the first telescopic rod 7, a first radial hole 16 is provided near one end, and a second radial hole 17 is provided near the other end. Usually, the first radial hole 16 and the second radial hole 17 are through holes, that is, they penetrate through the wall of the first telescopic rod 7. In this way, the wall of the first telescopic rod 7 can be designed to be thin enough, which is beneficial to the compact structure. The outer periphery of the second telescopic rod 10 is provided with a second ball buckle assembly 11. As mentioned above, the ball buckle assembly is a known structure, which usually includes a spring and a ball. The spring provides a radial outward force to the ball. When squeezed, the ball moves radially inward, and the spring is compressed. When there is an external obstacle, such as the first radial hole 16, the ball protrudes outward under the action of the spring to lock into the first radial hole 16. The second ball bearing latch assembly 11 is a double-headed ball bearing structure, which includes a second spring and two second balls. The second spring is arranged radially along the second telescopic rod 10, and the two second balls are located at both ends of the second spring, protruding from opposite radial sides of the outer periphery of the second telescopic rod 10. Using two-headed balls allows for good concentricity of the first telescopic rod 7 during axial movement, thus ensuring stable positioning. In contrast, a single ball bearing is prone to large eccentric friction during operation, which can affect positioning accuracy and cause jamming over time. In the first usage state, the second telescopic rod 10 is retracted into the first telescopic rod 7, and the balls of the second ball bearing latch assembly 11 are engaged in the first radial hole 16. In the second usage state, the second telescopic rod 10 is pulled out from the first telescopic rod 7, and the balls of the second ball bearing latch assembly 11 are engaged in the second radial hole 17. Furthermore, the inner wall of the first telescopic rod 7 is provided with an axially extending guide groove 19, and the outer periphery of the second telescopic rod 10 is provided with a guide protrusion 20. The guide protrusion 20 is adapted to the guide groove 19. When the second telescopic rod 10 extends or retracts relative to the first telescopic rod 7, the guide protrusion 20 slides left and right along the guide groove 19 to satisfy the precise extension and retraction positioning of the second telescopic rod 10. Furthermore, arranging the guide protrusion 20 and the second ball bearing buckle assembly 11 on the same axial direction, for example, facing each other left and right along the axial direction, or directly exposing the ball bearing of the second ball bearing buckle assembly 11 radially from the outer periphery of the guide protrusion 20, is beneficial to improving the accuracy of guiding positioning. There are two guide protrusions 20, which protrude radially from opposite sides of the outer periphery of the second telescopic rod 10. Preferably, the second ball bearing buckle assembly 11 and the first ball bearing buckle assembly 8 are radially offset.

[0045] The specific structures of the first wheel 1, the second wheel 12, the connecting pipe 6, the first telescopic rod 7, and the second telescopic rod 10 can have various design variations, for example:

[0046] In Embodiment 1, the connecting pipe 6 has a first end 3 and a second end 5 at its two ends. The first end 3 is located at one end of the connecting pipe 6, and the second end 5 is located at the other end of the connecting pipe 6. The connecting pipe 6 is contained within the rear fork cross tube 4. A first annular groove 14 can be formed on the first end 3. The outer periphery of the first end 3 is provided with an external thread for threaded connection to the internal thread inside one end of the rear fork cross tube 4. The first end 3 is provided with an internal threaded hole. A first screw 2 extends from the outer end of the first wheel 1 and is threaded into the internal threaded hole of the first end 3, thereby connecting the first screw 2 and the first end 3. The first wheel 1 can rotate back and forth relative to the first screw 2. A second annular groove 15 can be formed on the second end 5. The outer end (also referring to the right end) of the second end 5 has a radially inwardly extending annular stop protrusion to prevent the first telescopic rod 7 from completely disengaging outward. The outer periphery of the second end 5 is provided with an external thread for threaded connection to the internal thread inside the other end of the rear fork cross tube 4. The connecting tube 6 is positioned by the first end 3 and the second end 5 from both ends.

[0047] For the first telescopic rod 7, a circular tube is directly selected during manufacturing. The guide groove 19 on the inner wall is typically machined so that it extends through to the other end of the first telescopic rod 7, with the end of the guide groove 19 facing the first telescopic rod 7 being a blind end. A stop ring 9 is then inserted inside the other end of the first telescopic rod 7. This prevents the second telescopic rod 10 from completely disengaging from the other end of the first telescopic rod 7. Multiple sets of second radial holes 17 can be provided on the first telescopic rod 7, arranged at axial intervals. This provides multiple pull-out and positioning positions for the second telescopic rod 10, meeting different deployment length requirements.

[0048] The second telescopic rod 10 can be a hollow rod or a solid rod. An internal threaded hole is provided at the other end of the second telescopic rod 10. The second screw 13 extends from the outer end of the second wheel 12 and is threaded into the internal threaded hole at the other end of the second telescopic rod 10, thereby realizing the connection between the second screw 13 and the second telescopic rod 10. The second wheel 12 can rotate back and forth relative to the second screw 13.

[0049] In Embodiment 2, the multi-section telescopic mechanism of the easy-drive wheel is externally fixed to the rear fork cross tube 4 of the rear frame, and the connecting tube 6 is arranged parallel to the rear fork cross tube of the rear frame. The multi-section telescopic mechanism of the easy-drive wheel in Embodiment 2 is basically the same as that in Embodiment 1, with the main difference being:

[0050] Since the connecting tube 6 in Embodiment 1 is contained inside the rear fork cross tube 4, it needs to be fixed by forming a threaded connection with the rear fork cross tube 4 using the first end 3 and the second end 5.

[0051] In Embodiment 2, both the first annular groove 14 and the second annular groove 15 are directly disposed on the inner wall surface of the connecting pipe 6. Therefore, the inner wall thickness of the connecting pipe 6 is greater. From a structural strength perspective, due to the external mounting, compared to Embodiment 1, the protection of the rear fork cross tube 4 is lacking. The thickened connecting pipe 6 strengthens the overall structure. Connecting pieces 18 are connected to both ends of the connecting pipe 6. Each connecting piece 18 has two connecting holes, making it approximately figure-eight shaped. One connecting piece is connected to one end of the connecting pipe 6 and one end of the rear fork cross tube 4 of the rear frame, and the other connecting piece is connected to the other end of the connecting pipe 6 and the other end of the rear fork cross tube 4 of the rear frame. One end cap 3 of the connecting pipe 6 is threaded into the inside of the connecting pipe 6. Since one hole of the connecting piece 18 is fitted onto the outside of the connecting pipe 6, the first end cap 3 passes through one hole of the connecting piece 18 and is screwed into the inside of the connecting pipe 6. The first end cap 3 clamps and fixes the connecting piece 18 between the connecting pipe 6 and the cap of the first end cap 3, which acts as a nut. The other end of the connecting pipe 6 has an external thread on its outer circumference. One hole of another connecting piece 18 is fitted onto the other end of the connecting pipe 6, and then the thread is locked onto the external thread of the other end of the connecting pipe 6 to prevent the connecting piece 18 from coming out. The other end of the connecting pipe 6 can have a radially inwardly extending annular stop protrusion to prevent the first telescopic rod 7 from coming out completely. Furthermore, a bearing 5' made of acetal steel can be provided between the second annular groove 15 and the annular stop protrusion, which has high mechanical strength and rigidity and a low coefficient of friction.

[0052] Furthermore, a folding bicycle is provided, comprising a frame and a front wheel and a rear wheel mounted on the frame. The frame includes a front frame and a rear frame, with the front wheel mounted on the front frame and the rear wheel mounted on the rear frame. The front frame and the rear frame are connected by a foldable device. The frame also includes a support device for facilitating the pushing of the folded bicycle. The support device includes a multi-section telescopic mechanism as described above. When riding, the second wheel 12 can be retracted inwards to avoid hitting the feet and affecting the riding experience. When the bicycle is folded up, the second wheel 12 can be pulled out, extending sufficiently to pass over the bottom of the bicycle's own wheel and reach the outside, ensuring smooth pushing.

[0053] like Figure 5 As shown, the multi-section telescopic mechanism of the Easy Wheel is installed within the original rear fork cross tube 4 of the bicycle, and the connecting pipe 6 is set inside the rear fork cross tube 4 of the rear frame.

[0054] like Figure 9As shown, the multi-section telescopic mechanism of the easy-drive wheel is externally fixed to the rear fork cross tube 4 of the rear frame. Connecting pieces 18 are connected to both ends of the connecting pipe 6; one connecting piece is connected to one end of the connecting pipe 6 and one end of the rear fork cross tube 4 of the rear frame, and the other connecting piece is connected to the other end of the connecting pipe 6 and the other end of the rear fork cross tube 4 of the rear frame, such that: the connecting pipe 6 is externally fixed to the rear fork cross tube 4 of the rear frame, and the connecting pipe 6 is parallel to the rear fork cross tube of the rear frame.

[0055] The key design feature of this invention lies in its use of a multi-section telescopic mechanism (two or more sections) to achieve sufficient extension length and compact folding. Furthermore, its simple structure makes it easy to manufacture, operate, and use, making it highly practical and suitable for widespread application in folding bicycles.

[0056] Secondly, the first telescopic rod 7 is positioned by a circumferential groove, and the second telescopic rod 10 is positioned by an axial groove guide and a radial hole. On the one hand, this allows the first telescopic rod 7 to rotate smoothly when it gets stuck, so as to facilitate easy pulling out or retracting, and also satisfies the precise telescopic positioning of the second telescopic rod 10. On the other hand, it is beneficial to accommodate the setting of two or more telescopic mechanisms with a relatively small outer diameter of the system, while also taking into account the advantages of easy production, assembly, and convenient operation for users.

[0057] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A multi-sectioned telescopic mechanism for an easy-rolling wheel, characterized by: It includes a first wheel, a second wheel, a connecting pipe, a first telescopic rod, and a second telescopic rod; wherein the first wheel and the second wheel are spaced apart to the left and right, and the connecting pipe, the first telescopic rod, and the second telescopic rod all extend to the left and right. The first wheel is connected to one end of the connecting tube; one end of the first telescopic rod extends into the connecting tube and can slide left and right, so that the other end of the first telescopic rod extends and retracts left and right relative to the other end of the connecting tube; the first telescopic rod is a hollow rod, one end of the second telescopic rod extends into the first telescopic rod and can slide left and right, so that the other end of the second telescopic rod extends and retracts left and right relative to the other end of the first telescopic rod; the other end of the second telescopic rod is connected to the second wheel.

2. The easy-rolling wheel multi-section extension mechanism of claim 1, wherein: The other end of the second telescopic rod is directly connected to the second wheel; or: The other end of the second telescopic rod is connected to the second wheel via an extension telescopic mechanism. The extension telescopic mechanism includes a third telescopic rod. The second telescopic rod is a hollow rod. One end of the third telescopic rod extends into the second telescopic rod and can slide left and right, so that the other end of the third telescopic rod can extend and retract left and right relative to the other end of the second telescopic rod. The other end of the third telescopic rod is connected to the second wheel.

3. The easy-rolling wheel multi-section extension mechanism according to claim 1 or 2, characterized in that: On the inner wall of the connecting pipe, a first annular groove is provided near one end and a second annular groove is provided near the other end. Both the first annular groove and the second annular groove are arranged around the outer periphery of the first telescopic rod. The outer periphery of the first telescopic rod is provided with a first ball-shaped buckle assembly; In the first usage state, the first telescopic rod is retracted into the connecting tube, and the ball of the first ball buckle assembly is engaged in the first annular groove. In the second usage state, the first telescopic rod is pulled out from the connecting tube, and the ball of the first ball buckle assembly is engaged in the second annular groove.

4. The easy-rolling wheel multi-section extension mechanism of claim 3, wherein: The first ball buckle assembly is a double-headed ball structure, which includes a first spring and two first balls. The first spring is arranged radially along the first telescopic rod, and the two first balls are located at both ends of the first spring, protruding from the radially opposite sides of the outer periphery of the first telescopic rod.

5. The multi-section telescopic mechanism of the easy-moving wheel according to claim 1 or 2, characterized in that: On the inner wall of the first telescopic rod, a first radial hole is provided near one end and a second radial hole is provided near the other end. A second ball buckle assembly is provided on the outer periphery of the second telescopic rod. In the first usage state, the second telescopic rod is retracted into the first telescopic rod, and the ball of the second ball buckle assembly is engaged in the first radial hole; In the second usage state, the second telescopic rod is pulled out from the first telescopic rod, and the ball of the second ball buckle assembly is engaged in the second radial hole.

6. The multi-section telescopic mechanism of the easy-to-drive wheel according to claim 5, characterized in that: The inner wall of the first telescopic rod is provided with an axially extending guide groove, and the outer periphery of the second telescopic rod is provided with a guide protrusion. The guide protrusion is adapted to the guide groove. When the second telescopic rod extends or retracts relative to the first telescopic rod, the guide protrusion slides left and right along the guide groove.

7. The multi-section telescopic mechanism of the easy-to-drive wheel according to claim 5, characterized in that: The second ball buckle assembly is a double-headed ball structure, which includes a second spring and two second balls. The second spring is arranged radially along the second telescopic rod, and the two second balls are located at both ends of the second spring, protruding from the radially opposite sides of the outer periphery of the second telescopic rod.

8. A folding bicycle, comprising a frame and a front wheel and a rear wheel mounted on the frame, the frame including a front frame and a rear frame, the front wheel mounted on the front frame, the rear wheel mounted on the rear frame, the front frame and the rear frame connected by a folding device, and the frame further comprising a support device for facilitating the pushing of the folded bicycle, characterized in that: The support device includes a multi-section telescopic mechanism with easy-moving wheels as described in any one of claims 1 to 7.

9. The folding bicycle according to claim 8, characterized in that: The connecting pipe is installed inside the rear fork cross tube of the rear frame.

10. The folding bicycle according to claim 8, characterized in that: The two ends of the connecting tube are respectively connected to connecting pieces; one connecting piece is connected to one end of the connecting tube and one end of the rear fork cross tube of the rear frame, and the other connecting piece is connected to the other end of the connecting tube and the other end of the rear fork cross tube of the rear frame, so that the connecting tube is externally fixed to the rear fork cross tube of the rear frame.

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