Folding bicycle frame structure

Abstract

The utility model relates to the technical field of bicycles, in particular to a folding type bicycle frame structure which comprises a five-way pipe, a middle shaft, a rear fork and a second locking cover. The two first locking covers are symmetrically and fixedly arranged at the two ends of the five-way pipe, and an annular mounting groove is formed in the face, away from the five-way pipe, of each first locking cover; the center shaft is used for installing a chain disc and driving the chain disc to rotate, a positioning part is arranged on the center section of the center shaft, the center shaft penetrates through the first locking covers on the two sides, and first bearing sets used for supporting the center shaft to rotate are arranged between the two ends of the positioning part and the faces, facing the five-way pipe, of the first locking covers respectively; and the rear fork comprises two rear lower forks which are respectively and rotatably arranged in the mounting grooves. According to the design, the friction force in the process of folding the rotating part of the bicycle is reduced, so that the phenomena of blockage and jamming are not easy to occur in the whole folding process.

Description

Technical Field

[0001] The utility model relates to the field of bicycles, in particular to a foldable bicycle frame structure. Background Art

[0002] Bicycles are a popular means of transportation and leisure, often used for short trips. In recent years, with the popularization of health and environmental protection concepts, the bicycle industry has flourished. Among them, folding bicycles are popular among the public because they can be folded, the length of the frame can be shortened after folding, thus saving space, and are easy to carry and transport.

[0003] In the existing folding bicycle technology, when users rotate the folding connecting pipes in the folding bicycle frame structure, the folding pipes are prone to get stuck and the folding is not smooth, which affects the consumer's experience. Utility Model Content

[0004] The main purpose of the utility model is to provide a foldable bicycle frame structure, aiming to solve the technical problem that the bicycle is easily stuck during the folding process.

[0005] To achieve the above-mentioned purpose, the utility model provides a foldable bicycle frame structure, comprising: a five-way tube, the five-way tube is used as the central axis when the frame is folded and rotated; a first locking cover, two of the first locking covers are symmetrically fixedly arranged at both ends of the five-way tube, and a circular mounting groove is arranged on the side of the first locking cover facing away from the five-way tube; a middle shaft, the middle shaft is used to install a chain plate and drive the chain plate to rotate, a positioning part is arranged in the central section of the middle shaft, the middle shaft passes through the first locking covers on both sides, and there are respectively provided between the two ends of the positioning part and the side of the first locking cover facing the five-way tube for supporting the rotation of the middle shaft a first bearing group; a rear fork, the rear fork comprising two rear lower forks rotatably mounted in the mounting grooves, a second bearing group for supporting the rear lower fork to rotate on the first locking cover is arranged between the rear lower fork and the first locking cover; a second locking cover, the second locking cover is sleeved on the first locking cover, the second locking cover abuts against the second bearing group, a third bearing group for supporting the rear lower fork to rotate is arranged between the second locking cover and the rear lower fork, when the frame is folded, the rear lower fork rotates in the mounting groove relative to the first locking cover fixed on the five-way tube, and does not interfere with the rotation between the middle axis.

[0006] Preferably, the second locking cover is provided with a first protrusion, the rear chain stay is provided with a second protrusion, and the third bearing group is located between the first protrusion and the second protrusion.

[0007] Preferably, the foldable bicycle frame structure also includes a middle tube, an upper tube, a lower tube and a pressure-bearing shelf, the middle tube and the lower tube are respectively connected to the five-way tube, the upper tube is arranged on the middle tube and connected to the lower tube, and the upper tube is provided with a first mounting hole for mounting a front fork.

[0008] Preferably, the upper tube includes a first connecting portion and a second connecting portion, the first connecting portion is respectively connected to the middle tube and the lower tube, the second connecting portion is rotatably connected to the first connecting portion, the first mounting hole is arranged on the second connecting portion, and when the frame is folded, the second connecting portion is rotated to make the head tube close to the first connecting portion.

[0009] Preferably, the rear fork also includes two upper forks arranged side by side, the upper fork is connected to the lower fork, one end of the lower fork is connected to the five-way tube, the other end of the lower fork is provided with a tail hook for mounting a wheel, one end of the upper fork is connected to the lower fork, and the other end of the upper fork is detachably connected to the middle tube.

[0010] Preferably, a first cross tube is provided between the two upper forks at one end close to the middle tube, and symmetrical, parallel and identically shaped folding fixing members are respectively provided at both ends of the first cross tube, a first matching notch is provided on the folding fixing member, a folding connecting member is provided on the middle tube, a second matching notch is provided on a surface of the folding connecting member close to the rear fork, second cross tubes corresponding to the shape of the first matching notch are respectively provided at both ends of the folding connecting member, and a limiting member with a diameter larger than the second cross tube is provided at the end of the second cross tube; when the rear fork is not folded, the first cross tube abuts against the second matching notch, and the folding fixing member is hooked on the second cross tube through the first matching notch; when the rear fork is folded, the rear fork is rotated around the five-way tube, and the first matching notch rotates to slide out of the contour matching with the second cross tube.

[0011] Preferably, the rear fork also includes two first reinforcement members connecting the seat fork and the chain fork, one end of the first reinforcement member is connected to one end of the chain fork facing the five-way tube, the other end of the first reinforcement member is connected to one end of the seat fork close to the middle tube, and the first reinforcement member is perpendicular to the seat fork.

[0012] Preferably, a second reinforcement member is provided between the two first reinforcement members.

[0013] Preferably, a third reinforcement member is provided between the two rear chain stays, and a second mounting hole for mounting a foot support is provided on the third reinforcement member.

[0014] Preferably, the pressure-bearing shelf is arranged on the rear upper fork, the outer frame of the pressure-bearing shelf is trapezoidal in shape, and pressure-bearing wheels are provided at the corners of the outer frame of the pressure-bearing shelf.

[0015] In the technical solution provided by the utility model, the bicycle is folded by rotating the rear fork to a limited position to reduce the length of the whole bicycle. In the process of rotating the rear fork, since the middle shaft rotates under the support of the first bearing group, the rear fork rotates under the support of the second bearing group and the third bearing group, the first bearing group and the second bearing group respectively abut against the first locking cover to move and rotate, and the third bearing group falls on the second locking cover to rotate, so the rotation between the middle shaft and the rear fork is not affected by each other; the rear fork cover is effectively installed on the first locking cover through the annular mounting groove, and the second locking cover ensures that the second bearing group will not fall off from both sides. The rear fork is supported by the second bearing group and the third bearing group during the rotation process, which reduces the friction in the process of folding the rotating parts of the bicycle, making it less likely to get stuck or jammed during the entire folding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the foldable bicycle frame structure of the utility model;

[0018] Figure 2 It is a front structural schematic diagram of an embodiment of the foldable bicycle frame structure of the utility model;

[0019] Figure 3 for Figure 2 Sectional view at A in the middle;

[0020] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0021] Figure 5 for Figure 4 A partial enlarged view of point C in the middle;

[0022] Figure 6 The utility model is a schematic diagram of the overall structure of an embodiment of the foldable bicycle frame structure after being folded.

[0023] In the figure: 1, middle axis; 11, positioning part; 2, five-way tube; 3, first locking cover; 31, first bearing group; 32, mounting groove; 4, rear fork; 42, upper fork; 421, first cross tube; 422, folding fixing piece; 423, first matching notch; 43, lower fork; 431, tail hook; 432, third reinforcement piece; 433, second mounting hole; 44, second bearing group; 45, second protrusion; 46, first reinforcement piece; 461, second reinforcement piece; 5, second locking cover; 51, third bearing group; 52, first protrusion; 6, middle tube; 61, folding connecting piece; 611, second matching notch; 612, second cross tube; 613, limiting piece; 7, upper tube; 71, first mounting hole; 72, first connecting part; 73, second connecting part; 8, lower tube; 9, pressure shelf; 91, pressure wheel. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are only for illustrative purposes. In the description of the utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "include" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may be present or added.

[0025] In addition, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. All technical and scientific terms used in this specification have the same meaning as those generally understood by technicians in the technical field of the present utility model. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0026] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Please refer to Figures 1 to 6 The utility model provides a foldable bicycle frame structure, including: a five-way tube 2, which is used as the central axis when the frame is folded and rotated; a first locking cover 3, two first locking covers 3 are symmetrically fixedly arranged at both ends of the five-way tube 2, and a circular mounting groove 32 is arranged on the side of the first locking cover 3 away from the five-way tube 2; a middle shaft 1, which is used to install a chain plate and drive the chain plate to rotate, and a positioning part 11 is arranged in the central section of the middle shaft 1, and the middle shaft 1 passes through the first locking covers 3 on both sides, and a first bearing group 31 for supporting the rotation of the middle shaft 1 is respectively arranged between the two ends of the positioning part 11 and the side of the first locking cover 3 facing the five-way tube 2; a rear fork 4, the rear fork 4 includes two rear lower forks 43 respectively rotatably mounted in the mounting grooves 32, a second bearing group 44 for supporting the rear lower fork 43 to rotate on the first locking cover 3 is arranged between the rear lower fork 43 and the first locking cover 3; a second locking cover 5, the second locking cover 5 is sleeved on the first locking cover 3, the second locking cover 5 abuts against the second bearing group 44, a third bearing group 51 for supporting the rear lower fork 43 to rotate is arranged between the second locking cover 5 and the rear lower fork 43, when the frame is folded, the rear lower fork 43 rotates in the mounting groove 32 relative to the first locking cover 3 fixed on the bottom bracket 2, and does not interfere with the rotation between the rear lower fork 43 and the middle shaft 1.

[0028] In the technical solution provided by the utility model, the bicycle is folded by rotating the rear fork 43 to a limited position to reduce the length of the whole bicycle. In the process of rotating the rear fork 43, since the middle shaft 1 rotates under the support of the first bearing group 31, the rear fork 43 rotates under the support of the second bearing group 44 and the third bearing group 51, the first bearing group 31 and the second bearing group 44 respectively abut against the first locking cover 3 to move and rotate, and the third bearing group 51 falls on the second locking cover 5 to rotate, so the rotation between the middle shaft 1 and the rear fork 43 is not affected by each other; the rear fork 4 cover is effectively installed on the first locking cover 3 through the annular mounting groove 32, and the second locking cover 5 ensures that the second bearing group 44 will not fall off from both sides. The rear fork 43 is supported by the second bearing group 44 and the third bearing group 51 during the rotation process, which reduces the friction in the process of folding the rotating parts of the bicycle, making it less likely to get stuck or jammed during the entire folding process.

[0029] Please refer to Figures 1 to 6In one embodiment, the second locking cover 5 is provided with a first protrusion 52, the rear chain stay 43 is provided with a second protrusion 45, and the third bearing group 51 is located between the first protrusion 52 and the second protrusion 45. The first locking cover 3 and the bottom bracket 2 can be connected by threads, and the second locking cover 5 can be fixedly connected to the first locking cover 3 by threads. The limiting of the first protrusion 52 and the second protrusion 45 ensures that the third bearing group 51 will not be displaced in the axial direction and fall off during operation.

[0030] Please refer to Figures 1 to 6 In one embodiment, the foldable bicycle frame structure further includes a middle tube 6, an upper tube 7, a lower tube 8 and a pressure-bearing shelf 9. The middle tube 6 and the lower tube 8 are respectively connected to the bottom tube 2. The upper tube 7 is arranged on the middle tube 6 and connected to the lower tube 8. The upper tube 7 is provided with a first mounting hole 71 for mounting a front fork. The handlebar assembly is mounted on the foldable bicycle frame structure through the first mounting hole 71, and the seat cushion is mounted on the middle tube 6. The upper tube 7 can also be installed with an electric vehicle battery or an electric vehicle controller.

[0031] Please refer to Figures 1 to 6 In one embodiment, the upper tube 7 includes a first connection portion 72 and a second connection portion 73. The first connection portion 72 is connected to the middle tube 6 and the lower tube 8 respectively. The second connection portion 73 is rotatably connected to the first connection portion 72. The first mounting hole 71 is provided on the second connection portion 73. When the bicycle frame is folded, the second connection portion 73 is rotated to make the head tube close to the first connection portion 72. The first connection portion 72 and the second connection portion 73 are hinged, and the second connection portion 73 can be rotated to a side close to the first connection portion 72, so that the handlebar assembly installed in the first mounting hole 71 is twisted to a side close to the body of the bicycle, saving the placement space of the bicycle.

[0032] Please refer to Figures 1 to 6 In one embodiment, the rear fork 4 further includes two rear upper forks 42 arranged side by side, the rear upper fork 42 is connected to the rear lower fork 43, one end of the rear lower fork 43 is connected to the bottom bracket 2, and the other end of the rear lower fork 43 is provided with a tail hook 431 for mounting a wheel, one end of the rear upper fork 42 is connected to the rear lower fork 43, and the other end of the rear upper fork 42 is detachably connected to the middle tube 6. The tail hook 431 is used to mount the rear wheel, and when the bicycle is folded, the entire rear fork 4 is rotated along the middle axis 1 toward the lower tube 8 to reduce the length of the bicycle body.

[0033] Please refer to Figures 1 to 6In one embodiment, a first transverse tube 421 is provided between the ends of the two upper forks 42 close to the middle tube 6, and symmetrical, parallel and identically shaped folding fixing members 422 are respectively provided at both ends of the first transverse tube 421, and a first matching notch 423 is provided on the folding fixing member 422. A folding connecting member 61 is provided on the middle tube 6, and a second matching notch 611 is provided on a surface of the folding connecting member 61 close to the rear fork 4, and second transverse tubes 612 corresponding to the shape of the first matching notch 423 are respectively provided at both ends of the folding connecting member 61, and a limiting member 613 with a diameter larger than the second transverse tube 612 is provided at the end of the second transverse tube 612; when the rear fork 4 is not folded, the first transverse tube 421 abuts against the second matching notch 611, and the folding fixing member 422 is hooked on the second transverse tube 612 through the first matching notch 423; when the rear fork 4 is folded, the rear fork 4 is rotated around the five-way tube 2, and the first matching notch 423 rotates and slides out of the contour that matches the second transverse tube 612. The stopper 613 is used to prevent the folding fixing piece from slipping off from both ends when hooked on the second transverse tube 612 .

[0034] Please refer to Figures 1 to 6 In one embodiment, the rear fork 4 further includes two first reinforcement members 46 connecting the seat stay 42 and the chain stay 43, one end of the first reinforcement member 46 is connected to the end of the chain stay 43 facing the bottom bracket 2, and the other end of the first reinforcement member 46 is connected to the end of the seat stay 42 close to the middle tube 6, and the first reinforcement member 46 is perpendicular to the seat stay 42. The provision of the first reinforcement member 46 helps to prevent the structure from loosening or deformation due to vibration, load or other external factors during use.

[0035] Please refer to Figures 1 to 6 In one embodiment, a second reinforcement member 461 is provided between the two first reinforcement members 46. This further enhances the stability of the entire structure, helps to disperse and withstand pressure or loads from different directions, and makes the structure more stable.

[0036] Please refer to Figures 1 to 6 In one embodiment, a third reinforcing member 432 is provided between the two rear chain stays 43, and a second mounting hole 433 for mounting a foot support is provided on the third reinforcing member 432. The second mounting hole 433 can be used to mount accessories such as a foot support and a mud plate, and the third reinforcing member 432 can link the two side-by-side rear chain stays 43 to increase the structural strength, so that the entire rear chain stay 43 is more stable when the bicycle is in motion.

[0037] Please refer to Figures 1 to 6 In one embodiment, the pressure shelf 9 is arranged on the rear upper fork 42, the outer frame of the pressure shelf 9 is in a trapezoidal shape, and pressure wheels 91 are arranged at the corners of the outer frame of the pressure shelf 9. The pressure shelf 9 can be used to load goods during normal use, and the pressure shelf 9 can replace the wheels to support the bicycle body after folding. The pressure wheels 91 arranged on the pressure shelf 9 can play a role in pushing the bicycle after it is folded.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A foldable bicycle frame structure, characterized in that: include: A bottom bracket tube (2), the bottom bracket tube (2) being used as a central axis when the frame is folded and rotated; A first locking cover (3), wherein two of the first locking covers (3) are symmetrically fixedly arranged at two ends of the five-way pipe (2), and a circular mounting groove (32) is arranged on a surface of the first locking cover (3) facing away from the five-way pipe (2); A middle shaft (1), the middle shaft (1) being used to mount a chain plate and drive the chain plate to rotate, a positioning portion (11) being provided at a central section of the middle shaft (1), the middle shaft (1) passing through the first locking covers (3) on both sides, and first bearing groups (31) for supporting the rotation of the middle shaft (1) being provided respectively between the two ends of the positioning portion (11) and a surface of the first locking cover (3) facing the five-way pipe (2); A rear fork (4), the rear fork (4) comprising two rear lower forks (43) respectively rotatably mounted in the mounting grooves (32), and a second bearing group (44) for supporting the rear lower fork (43) to rotate on the first locking cover (3) is provided between the rear lower fork (43) and the first locking cover (3); A second locking cover (5), wherein the second locking cover (5) is sleeved on the first locking cover (3), the second locking cover (5) abuts against the second bearing group (44), and a third bearing group (51) for supporting the rotation of the rear fork (43) is arranged between the second locking cover (5) and the rear fork (43); when the bicycle frame is folded, the rear fork (43) rotates in the mounting groove (32) relative to the first locking cover (3) fixed on the five-way tube (2), and does not interfere with the rotation of the middle shaft (1).

2. The foldable bicycle frame structure according to claim 1, characterized in that: The second locking cover (5) is provided with a first protrusion (52), the rear chain stay (43) is provided with a second protrusion (45), and the third bearing group (51) is located between the first protrusion (52) and the second protrusion (45).

3. The foldable bicycle frame structure according to claim 1, characterized in that: The foldable bicycle frame structure also includes a middle tube (6), an upper tube (7), a lower tube (8) and a pressure-bearing shelf (9); the middle tube (6) and the lower tube (8) are respectively connected to the five-way tube (2); the upper tube (7) is arranged on the middle tube (6) and connected to the lower tube (8); and the upper tube (7) is provided with a first mounting hole (71) for mounting a front fork.

4. The foldable bicycle frame structure according to claim 3, characterized in that: The upper tube (7) comprises a first connecting portion (72) and a second connecting portion (73); the first connecting portion (72) is respectively connected to the middle tube (6) and the lower tube (8); the second connecting portion (73) is rotatably connected to the first connecting portion (72); the first mounting hole (71) is arranged on the second connecting portion (73); when the bicycle frame is folded, the second connecting portion (73) is rotated to make the head tube close to the first connecting portion (72).

5. The foldable bicycle frame structure according to claim 4, characterized in that: The rear fork (4) also includes two rear upper forks (42) arranged side by side, the rear upper fork (42) is connected to the rear lower fork (43), one end of the rear lower fork (43) is connected to the five-way tube (2), the other end of the rear lower fork (43) is provided with a tail hook (431) for mounting a wheel, one end of the rear upper fork (42) is connected to the rear lower fork (43), and the other end of the rear upper fork (42) is detachably connected to the middle tube (6).

6. The foldable bicycle frame structure according to claim 5, characterized in that: A first transverse tube (421) is provided between the ends of the two upper forks (42) close to the middle tube (6); symmetrical, parallel and identically shaped folding fixing members (422) are respectively provided at both ends of the first transverse tube (421); a first matching notch (423) is provided on the folding fixing member (422); a folding connecting member (61) is provided on the middle tube (6); a second matching notch (611) is provided on a surface of the folding connecting member (61) close to the rear fork (4); second transverse tubes (612) corresponding to the shape of the first matching notch (423) are respectively provided at both ends of the folding connecting member (61); a stopper (613) having a diameter greater than that of the second transverse tube (612) is provided at the end of the second transverse tube (612); When the rear fork (4) is not folded, the first transverse tube (421) abuts against the second matching notch (611), and the folding fixing piece is hooked onto the second transverse tube (612) through the first matching notch (423); when the rear fork (4) is folded, the rear fork (4) is rotated around the five-way tube (2), and the first matching notch (423) rotates and slides out of a contour that matches the second transverse tube (612).

7. The foldable bicycle frame structure according to claim 6, characterized in that: The rear fork (4) further comprises two first reinforcing members (46) connecting the upper fork (42) and the lower fork (43), one end of the first reinforcing member (46) being connected to an end of the lower fork (43) facing the five-way tube (2), and the other end of the first reinforcing member (46) being connected to an end of the upper fork (42) close to the middle tube (6), and the first reinforcing member (46) being perpendicular to the upper fork (42).

8. The foldable bicycle frame structure according to claim 7, characterized in that: A second reinforcement member (461) is provided between the two first reinforcement members (46).

9. The foldable bicycle frame structure according to claim 8, characterized in that: A third reinforcement member (432) is provided between the two rear lower forks (43), and a second mounting hole (433) for mounting a foot support is provided on the third reinforcement member (432).

10. The foldable bicycle frame structure according to claim 9, characterized in that: The pressure-bearing shelf (9) is arranged on the rear upper fork (42); the outer frame of the pressure-bearing shelf (9) is in a trapezoidal shape; and pressure-bearing wheels (91) are arranged at the corners of the outer frame of the pressure-bearing shelf (9).

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