Six-link longitudinal folding frame and inverted tricycle using the same

Abstract

The present invention provides a six-link longitudinal folding frame and an inverted tricycle using the same, comprising: a seat tube link including a short portion and a long portion, wherein the first end of the long portion is integrally connected with the first end of the short portion; the first end of the long portion is provided with a first connecting portion, and the second end of the long portion is provided with a second connecting portion and a third connecting portion; a crossbeam link, wherein the first end is rotatably connected to the first connecting portion; the first end of the locking link is rotatably connected to the middle portion of the crossbeam link; the first end of the shock absorber is rotatably connected to the second end of the crossbeam link; a flat fork link, wherein the first end and the second end of the quadrilateral frame structure are arranged in a clockwise direction; the first end of the flat fork link is rotatably connected to the second connecting portion; the second end of the flat fork link is rotatably connected to the second end of the shock absorber; a cushion link, wherein the first end is rotatably connected to the second end of the locking link; and the second end of the cushion link is rotatably connected to the third connecting portion. The frame has a compact structure in a folded state, a high concentration of components, and a high utilization rate of the internal space after folding, and is convenient for carrying and storage.

Description

Technical Field

[0001] The present invention relates to the technical field of bicycles, and in particular to a six-link longitudinal folding frame and a reverse three-wheeled bicycle using the same. Background Art

[0002] With economic development and technological progress, people's demand for a better life is increasing. People are no longer just satisfied with the needs of daily transportation, but also pursue more personalized, more fun, safer short-distance transportation tools that are easy to carry and store. They can be placed in the trunk of the car, next to the desk, or in the corner of the bedroom, so that they can be taken with them to travel outdoors. Folding bicycles are easy to carry and comfortable to use, which can meet people's above needs. The folding frame is the most basic and most critical structure of the bicycle, and it is also the skeleton and body of the bicycle. Other parts are directly or indirectly installed on the folding frame and need to withstand the pressure from various parts. Therefore, the folding frame must meet the safety strength while also being easy to operate and saving space.

[0003] Traditional folding frames often adopt a front and rear transverse folding structure. In the early days, this folding method was mostly used in ordinary human-powered bicycles. However, with the development of electric bicycles, the disadvantages of this folding method are obvious. This kind of frame is wider after folding, the density of parts is low, the internal space utilization rate is low after folding, and the frame occupies a large three-dimensional space after folding. The overall folding effect is not good, so this kind of folding frame is not suitable for electric bicycles, and it greatly reduces the durability of electric bicycles.

[0004] The above-mentioned folding frame lacks a limiting system, and the folded state of the whole bicycle is unstable and easy to unfold loosely, which makes the bicycle inconvenient during storage, carrying or transportation.

[0005] In addition, in order to match the above-mentioned folding frame, the bicycle structure is usually designed to be compact. In the case of sacrificing the size of the whole bicycle, the driver is in a tight state during riding. At the same time, the existing folding electric bicycles are derived from ordinary bicycles, most of which have two wheels, and the driving safety is not as high as that of three-wheeled bicycles. Most of them do not have shock absorbers. The above-mentioned existing design defects have greatly reduced the controllability of the bicycle and the comfort of the driver, and the road passability and comfort are poor.

[0006] In summary, the prior art has the following technical defects:

[0007] (1) The folding effect is poor, the folding method is old-fashioned, takes up a lot of space, and the folded state is loose, which is inconvenient to carry and store;

[0008] (2) Poor human-machine effect and poor controllability;

[0009] (3) Poor comfort, not suitable for bumpy roads;

[0010] (4) It is safer than a reverse tricycle. Summary of the invention

[0011] The present invention discloses a six-link longitudinal folding frame of an inverted three-wheeled bicycle and a folding and unfolding method thereof, which at least solves some of the above problems.

[0012] To achieve the above-mentioned purpose, the present disclosure provides a six-link longitudinal folding frame, including: a seat tube link, which is an L-shaped structure, and the seat tube link includes: a short part; and a long part, the first end of the long part and the first end of the short part are integrally connected; the first end of the long part is provided with a first connecting part, and the second end of the long part is provided with a second connecting part and a third connecting part.

[0013] A crossbeam connecting rod, wherein the first end of the crossbeam connecting rod is rotatably connected to the first connecting portion via a rotating shaft.

[0014] A locking link, wherein a first end of the locking link is rotatably connected to a middle portion of the crossbeam link via a rotating shaft.

[0015] A shock absorber, wherein a first end of the shock absorber is rotatably connected to a second end of the crossbeam connecting rod via a rotating shaft.

[0016] The fork link is a quadrilateral frame structure, the first end and the second end of the fork link are arranged in a clockwise direction; the first end of the fork link is rotatably connected to the second connecting part through a rotating shaft; the second end of the fork link is rotatably connected to the second end of the shock absorber through a rotating shaft.

[0017] A cushion connecting rod, wherein the first end of the cushion connecting rod is rotationally connected to the second end of the locking connecting rod via a rotating shaft; and the second end of the cushion connecting rod is rotationally connected to the third connecting portion via a rotating shaft.

[0018] The folding frame adopts a six-link longitudinal folding structure, and has the following advantages compared with the traditional front and rear transverse folding structure: during the folding process of the frame disclosed in the present invention, the crossbeam connecting rod, the locking connecting rod, the seat cushion connecting rod, the shock absorber and the horizontal fork connecting rod are rotated to move closer to the seat tube connecting rod, so that the seat tube connecting rod, the crossbeam connecting rod, the locking connecting rod and the seat cushion connecting rod are close together to form a straight line, and the horizontal fork connecting rod is located at the lower part of the above-mentioned straight line structure. Finally, the folded state of the overall structure is an inverted triangle, the structure is compact, the concentration of parts is high, and the utilization rate of the internal space after folding is high, which is convenient for carrying and storage.

[0019] Optionally, the riser connecting rod further comprises: a hanging ear connected to the second end of the short portion of the riser connecting rod.

[0020] The horizontal fork connecting rod also includes: a second hook, which is arranged on one side of the horizontal fork connecting rod frame structure, and the second hook is rotatably connected to the horizontal fork connecting rod through a rotating shaft.

[0021] When the six-link longitudinal folding frame is in a folded state, the hanging ear is connected to the second hook, and the riser link and the horizontal fork link are fixed and locked.

[0022] Optionally, the crossbeam connecting rod further comprises: a hanging ring, fixedly connected to the second end of the crossbeam connecting rod;

[0023] The locking link further includes: a first hook, which is arranged at the second end of the locking link, and the first hook is rotatably connected to the locking link via a rotating shaft;

[0024] When the six-link longitudinal folding frame is in an unfolded state, the hanging ring is connected to the first hook, and the crossbeam connecting rod and the locking connecting rod are fixed and locked.

[0025] Optionally, the stem connecting rod further includes: a front fork connecting portion connected to the side wall of the first end of the stem connecting rod, and the front fork connecting portion is arranged on the opposite side of the long portion; and a handle connecting portion is arranged at the end of the first end of the stem connecting rod.

[0026] Optionally, the crossbeam connecting rod comprises: an elongated groove, which starts from the middle of the crossbeam connecting rod and ends at the second end of the crossbeam connecting rod.

[0027] When the six-link longitudinal folding frame is tightened from the unfolded state to the folded state, the locking link rotates around the middle of the crossbeam link from the second end of the crossbeam link to the first end of the crossbeam link and is embedded in the long strip groove.

[0028] When the six-link longitudinal folding frame is opened from a folded state to an unfolded state, the locking link rotates around the middle of the crossbeam link from the first end of the crossbeam link to the second end of the crossbeam link and is embedded in the long strip groove.

[0029] The long strip groove is used to embed and accommodate the locking link to form a mechanical limit, which can prevent the locking link from excessively rotating when moving away from or approaching the crossbeam link, thereby preventing the locking link from interfering with other parts of the folding frame.

[0030] The long groove makes the assembly relationship between the crossbeam link and the locking link more compact, thereby saving the internal space of the folding frame, achieving a better folding or unfolding effect, and increasing the stability of the frame when it is in the riding and storage states.

[0031] Optionally, the cushion connecting rod further includes: a cushion connecting portion, which is arranged at the first end of the cushion connecting rod.

[0032] Optionally, the shock absorber is a spring shock absorber, a spring-air damping shock absorber, a hydraulic damping shock absorber or an oil-gas combined front fork shock absorber. The shock absorber can reduce the impact force on the bicycle in a bumpy road section and increase the comfort of the rider.

[0033] Optionally, the flat fork link further comprises:

[0034] The reinforcing rib is fixedly arranged in the middle of the flat fork connecting rod, and the reinforcing rib and any two sides of the flat fork connecting rod form a triangular structure; another aspect of the present disclosure provides a reverse three-wheeled bicycle using the above six-link longitudinal folding frame, comprising:

[0035] Front wheels, there are two front wheels;

[0036] The front fork is U-shaped, and two branches at one end of the U-shaped opening are rotatably connected to the front wheel through a rotating shaft; the front fork is connected to the front fork connecting part;

[0037] A handle, fixedly connected to the handle connecting portion;

[0038] A seat cushion, fixedly connected to the seat cushion connecting rod;

[0039] The seat is fixedly connected to the middle part of the flat fork connecting rod.

[0040] Optionally, the inverted three-wheeled bicycle further comprises:

[0041] A sprocket is rotatably connected to one end of the reinforcing rib via a rotating shaft;

[0042] A crank, the crank is fixedly connected to the sprocket, and the sprocket is rotatably connected to one end of the flat fork connecting rod with a reinforcing rib through a rotating shaft;

[0043] The rear wheel is rotatably connected to the third end of the fork link through a rotating shaft; the third end of the fork link is adjacent to the second end;

[0044] A chain, which is meshed and connected with the sprocket and the rear wheel respectively;

[0045] The riding mode of the inverted three-wheeled bicycle is three-point support, while the riding mode of an ordinary two-wheeled bicycle is two-point support. Therefore, compared with an ordinary two-wheeled bicycle, the inverted three-wheeled bicycle disclosed in the present invention has higher steering stability and controllability, further improving riding safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the six-link longitudinal folding frame in an unfolded state;

[0047] Figure 2 It is a three-dimensional schematic diagram of the seat tube link of the six-link longitudinal folding frame;

[0048] Figure 3 It is the schematic diagram of the connection of the six-link longitudinal folding frame;

[0049] Figure 4 It is a schematic diagram of the six-link longitudinal folding frame in a folded state;

[0050] Figure 5This is an exploded view of the six-link longitudinal folding frame;

[0051] Figure 6 It is a three-dimensional schematic diagram of a crossbar link of a six-link longitudinal folding frame;

[0052] Figure 7 It is a three-dimensional schematic diagram of a locking link of a six-link longitudinal folding frame;

[0053] Figure 8 It is a three-dimensional schematic diagram of the seat connecting rod of the six-link longitudinal folding frame;

[0054] Fig. 9 It is a three-dimensional schematic diagram of the flat fork link of the six-link longitudinal folding frame;

[0055] Fig.10 A schematic diagram of a folded state of a reverse tricycle using a six-link longitudinal folding frame;

[0056] Fig.11 This is a schematic diagram of the unfolded state of a reverse three-wheeled bicycle with a six-link longitudinal folding frame.

[0057]

Explanation of symbols

[0058] 1-Standard tube connecting rod;

[0059] 11- hanging ear;

[0060] 12- first connecting portion;

[0061] 13- second connecting portion;

[0062] 14- third connecting portion;

[0063] 15- front fork connection;

[0064] 16-handle connection part;

[0065] 2- beam connecting rod;

[0066] 21-hanging ring;

[0067] 3-locking link;

[0068] 31- first hook;

[0069] 4-seat connecting rod;

[0070] 41-seat cushion connection part;

[0071] 5-Shock absorber;

[0072] 6- parallel fork connecting rod;

[0073] 61-Reinforcement ribs;

[0074] 62 - second hook;

[0075] 63-first end of the flat fork connecting rod;

[0076] 64 - second end of the flat fork connecting rod;

[0077] 65-the third end of the flat fork connecting rod;

[0078] 66 - fourth end of the flat fork connecting rod;

[0079] 67 - first side;

[0080] 68 - second side;

[0081] 69 - third side;

[0082] 610-fourth side;

[0083] 7-Handle;

[0084] 8-Front fork;

[0085] 9-Front wheel;

[0086] 10- Seat cushion;

[0087] 110-seats;

[0088] 120-crank;

[0089] 130-sprocket;

[0090] 140-chain;

[0091] 150-Rear wheel. DETAILED DESCRIPTION

[0092] In order to make the purpose, technical scheme and advantages of the present disclosure more clear, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, the present disclosure can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art. In the accompanying drawings, for clarity, the sizes and relative sizes of layers and regions may be exaggerated, and the same reference numerals represent the same elements throughout.

[0093] To achieve the above objectives, the present invention provides a six-link longitudinal folding frame, such as Figure 1 As shown, it includes: a seat tube connecting rod 1, a crossbeam connecting rod 2, a locking connecting rod 3, a cushion connecting rod 4, a shock absorber 5 and a flat fork connecting rod 6. Figure 2As shown, the first end of the cross beam link 2 is rotatably connected to the first connecting portion 12 via a rotating shaft. The first end of the locking link 3 is rotatably connected to the middle portion of the cross beam link 2 via a rotating shaft. The first end of the shock absorber 5 is rotatably connected to the second end of the cross beam link 2 via a rotating shaft. The first end of the cushion link 4 is rotatably connected to the second end of the locking link 3 via a rotating shaft; the second end of the cushion link 4 is rotatably connected to the third connecting portion 14 via a rotating shaft. The first end 63 of the fork link is rotatably connected to the second connecting portion 13 via a rotating shaft; the second end 64 of the fork link is rotatably connected to the second end of the shock absorber 5 via a rotating shaft.

[0094] like Figure 3 As shown, the folding frame adopts a six-link longitudinal folding structure, which has the following advantages compared with the traditional front and rear transverse folding structure: during the folding process of the frame of the present invention, the crossbeam link 2, the locking link 3, the cushion link 4, the shock absorber 5 and the fork link 6 are connected to the seat tube link 1 through rotation, so that the seat tube link 1, the crossbeam link 2, the locking link 3, the cushion link 4 are close together to form a straight line, and the fork link 6 is located at the lower part of the straight line structure. Finally, the folded state of the overall structure is an inverted triangle, the structure is compact, the concentration of parts is high, and the utilization rate of the internal space after folding is high, which is convenient for carrying and storage.

[0095] The following describes in detail each component of the six-link longitudinal folding frame.

[0096] like Figure 2 As shown, the riser connecting rod 1 is an L-shaped structure, and the riser connecting rod 1 includes a short portion and a long portion. Figure 2 As shown, the first end of the long part is on the left side in the figure, the second end of the long part is on the right side in the figure, the first end of the short part is on the upper side in the figure, and the second end of the short part is on the lower side in the figure. The first end of the long part and the first end of the short part are connected as a whole to form an L-shaped structure; the first end of the long part is provided with a first connecting part 12, and the second end of the long part is provided with a second connecting part 13 and a third connecting part 14, as shown in FIG. Figure 2 As shown, the second connection portion 13 is disposed below the third connection portion 14 .

[0097] The seat tube link 1 further comprises: a front fork connection portion 15 connected to the side wall of the first end of the seat tube link 1, and the front fork connection portion 15 is arranged on the opposite side of the long portion, and the front fork connection portion 15 is used to connect to the front fork 8 of the bicycle. A handlebar connection portion 16 is arranged at the end of the first end of the seat tube link 1, and the handlebar connection portion 16 is used to connect to the handlebar 7 of the bicycle.

[0098] In this embodiment, the fork link 6 is a quadrilateral frame structure. Fig. 9The four ends of the fork link 6 are arranged in a clockwise direction with the first end 63 of the fork link as the reference, and are the second end 64 of the fork link, the third end 65 of the fork link, and the fourth end 66 of the fork link. Among them, the first end 63 and the second end 64 are the first side 67, the second end 64 of the fork link and the third end 65 of the fork link are the second side 68, the third end 65 of the fork link and the fourth end 66 of the fork link are the third side 69, and the fourth end 66 of the fork link and the first end 63 of the fork link are the fourth side 610. One side of the frame structure of the fork link 6 (such as Fig. 9 The third side 69 shown is provided with a second hook 62. The second end of the short portion of the corresponding riser link 1 is provided with a hook 11. When the six-link longitudinal folding frame is in a folded state, the hook 11 is connected to the second hook 62, and the riser link 1 and the fork link 6 are fixed and locked.

[0099] like Figure 6 As shown, the cross beam connecting rod 2 includes: a long strip groove starting from the middle of the cross beam connecting rod 2 and ending at the second end of the cross beam connecting rod 2.

[0100] When the six-link longitudinal folding frame is tightened from the unfolded state to the folded state, the locking link 3 rotates around the middle of the crossbeam link 2 from the second end of the crossbeam link 2 to the first end of the crossbeam link 2 and is embedded in the long strip groove.

[0101] When the six-link longitudinal folding frame is opened from the folded state to the unfolded state, the locking link 3 rotates around the middle of the crossbeam link 2 from the first end of the crossbeam link 2 to the second end of the crossbeam link 2 and is embedded in the long strip groove.

[0102] The long strip groove is used to embed and accommodate the locking link 3 to form a mechanical limit, which can prevent the locking link 3 from excessively rotating when moving away from or approaching the crossbeam link 2 and interfering with other parts of the folding frame. The long strip groove makes the assembly relationship between the crossbeam link 2 and the locking link 3 more compact.

[0103] The crossbeam connecting rod 2 further includes a hanging ring 21 which is fixedly connected to the second end of the crossbeam connecting rod 2 .

[0104] like Figure 7 As shown, the locking link 3 includes: a first hook 31, which is arranged at the second end of the locking link 3, and the first hook 31 is rotatably connected to the locking link 3 through a rotating shaft;

[0105] When the six-link longitudinal folding frame is in the unfolded state (such as Fig.10 As shown), the hanging ring 21 is connected to the first hook 31, and the crossbeam connecting rod 2 and the locking connecting rod 3 are fixed and locked.

[0106] like Figure 8As shown, the cushion connecting rod 4 further includes: a cushion connecting portion 41 is arranged at the first end of the cushion connecting rod 4 .

[0107] In this embodiment, the shock absorber 5 is selected from any one of a spring shock absorber, a spring-air damping shock absorber, a hydraulic damping shock absorber, and an oil-gas combined front fork shock absorber, or a combination of multiple thereof. In this embodiment, the shock absorber 5 can reduce the impact force on the bicycle on a bumpy road section, and at the same time play a role in increasing the comfort of the rider. Therefore, any shock absorber that can achieve the above effects known to those skilled in the art can be applied to this application, and will not be listed one by one here.

[0108] like Fig. 9 As shown, the horizontal fork link 6 further includes: a reinforcing rib 61, which is fixedly arranged in the middle of the horizontal fork link, and the reinforcing rib 61 and any two sides of the horizontal fork link 6 form a triangular structure;

[0109] Another embodiment of the present disclosure provides a reverse three-wheeled bicycle using the above-mentioned six-link longitudinal folding frame, including: a front wheel 9, a front fork 8, a handlebar 7, a cushion 10, a seat 110, a sprocket 130, a crank 120, a rear wheel 150, and a chain 140.

[0110] The seat cushion 10 is fixedly connected to the seat cushion connecting rod 4. The seat 110 is fixedly connected to the middle part of the flat fork connecting rod 6.

[0111] The front wheel 9, the front fork 8 and the handlebar 7 serve as a steering system of the inverted tricycle using the six-link longitudinal folding frame. Specifically, there are two front wheels 9. The front fork 8 is U-shaped, and two branches at one end of the U-shaped opening are rotatably connected to the front wheel 9 respectively through a rotating shaft; the front fork 8 is connected to the front fork connecting portion 15. The handlebar 7 is fixedly connected to the handlebar connecting portion 16.

[0112] The sprocket 130, crank 120, rear wheel 150 and chain 140 serve as a steering system for the inverted tricycle using the above-mentioned six-link longitudinal folding frame. Specifically, the sprocket 130 is rotatably connected to one end of the reinforcing rib 61 through a rotating shaft; the crank 120 is fixedly connected to the sprocket 130, and the sprocket 130 is rotatably connected to one end of the fork link 6 having the reinforcing rib 61 through a rotating shaft; the rear wheel 150 is rotatably connected to the third end of the fork link 6 through a rotating shaft; the third end of the fork link 6 is adjacent to the second end; and the chain 140 is meshedly connected to the sprocket 130 and the rear wheel 150 respectively. The crank 120 serves as a power input mechanism, transmitting the pedaling force of the rider to the rear wheel 150 through the sprocket 130 and the chain 140.

[0113] The riding mode of the inverted three-wheeled bicycle is three-point support, while the riding mode of an ordinary two-wheeled bicycle is two-point support. Therefore, compared with an ordinary two-wheeled bicycle, the inverted three-wheeled bicycle disclosed in the present invention has higher steering stability and controllability, further improving riding safety.

[0114] The above-mentioned inverted tricycle using the six-link longitudinal folding frame is very convenient to fold, and the steps are as follows:

[0115] Step 1: Open the first hook 31 of the locking link 3, so that the first hook 31 is separated from the hanging ring 21 of the cross beam link 2, and the seat cushion 10 is driven by external force to rotate the seat cushion link 4 in the direction close to the seat tube link 1, thereby driving the locking link 3 to rotate in the direction close to the cross beam link 2, and at the same time driving the fork link 6 to rotate in the direction away from the seat cushion link 4;

[0116] Step 2: When the locking link 3 is embedded in the long strip groove of the crossbeam link 2, and the crossbeam link 2 is in contact with the seat tube link 1; when the fork link 6 is rotated to be in contact with the seat tube link 1, the second hook 62 of the fork link 6 is moved to hook the second hook 62 on the ear 11 of the seat tube link 1. Fig.10 The unfolding steps of the above-mentioned inverted tricycle using the six-link longitudinal folding frame are as follows:

[0117] Step 1: Move the second hook 62 of the horizontal fork link 6 to separate the second hook 62 from the hanging ear 11 of the vertical tube link 1;

[0118] Step 2: Drive the seat 10 by external force to make the seat link 4 rotate away from the seat tube link 1, thereby driving the locking link 3 to rotate away from the crossbar link 2, and at the same time driving the fork link 6 to rotate towards the seat link 4, until the six-link longitudinal folding frame of the inverted three-wheeled bicycle is fully unfolded, and the first hook 31 of the locking link 3 is hung on the hanging ring 21, completing the unfolding and locking of the six-link longitudinal folding frame of the inverted three-wheeled bicycle. Fig.11 The folding and unfolding process of the six-link longitudinal folding frame of the inverted tricycle is easy to operate and has a locking and fixing function, so that the rider can carry it conveniently and ensure the riding safety.

[0119] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", "middle", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure, and the shapes and sizes of the components in the drawings do not reflect the actual size and proportion, but only illustrate the contents of the embodiments of the present disclosure.

[0120] The ordinal numbers used in the specification and claims, such as "first", "second", "third", etc., to modify the corresponding elements, do not themselves mean that the elements have any ordinal numbers, nor do they represent the order of one element and another element, or the order in the manufacturing method. The use of these ordinal numbers is only used to clearly distinguish a component with a certain name from another component with the same name.

[0121] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0122] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A six-link longitudinal folding frame, comprising: The riser connecting rod is an L-shaped structure, and the riser connecting rod comprises: Short part; and A long portion, wherein the first end of the long portion and the first end of the short portion are integrally connected; the first end of the long portion is provided with a first connecting portion, and the second end of the long portion is provided with a second connecting portion and a third connecting portion; A hanging ear connected to the second end of the short portion of the riser connecting rod; A front fork connection portion connected to the side wall of the first end of the riser link, and the front fork connection portion is connected to an opposite side of the long portion; A handle connection portion connected to the end of the first end of the riser connecting rod; A crossbeam connecting rod, wherein the first end of the crossbeam connecting rod is rotatably connected to the first connecting portion via a rotating shaft, and the crossbeam connecting rod further comprises: A hanging ring, fixedly connected to the second end of the crossbeam connecting rod; An elongated groove, the elongated groove starts from the middle of the crossbeam connecting rod and ends at the second end of the crossbeam connecting rod; A locking link, wherein the first end of the locking link is rotatably connected to the middle portion of the crossbeam link via a rotating shaft, and the locking link further comprises: A first hook is arranged at the second end of the locking link, and the first hook is rotatably connected to the locking link via a rotating shaft; When the six-link longitudinal folding frame is in an unfolded state, the hanging ring is connected to the first hook, and the crossbeam connecting rod is fixedly locked to the locking connecting rod; A shock absorber, wherein a first end of the shock absorber is rotatably connected to a second end of the crossbeam connecting rod via a rotating shaft; A fork link, the fork link is a quadrilateral frame structure, the first end and the second end of the fork link are arranged in a clockwise direction; the first end of the fork link is rotatably connected to the second connecting portion through a rotating shaft; the second end of the fork link is rotatably connected to the second end of the shock absorber through a rotating shaft, and the fork link also includes: A second hook is arranged on one side of the flat fork link frame structure, and the second hook is rotatably connected to the flat fork link via a rotating shaft; When the six-link longitudinal folding frame is in a folded state, the hanging ear is connected to the second hook, and the riser link is fixedly locked to the fork link; A cushion connecting rod, wherein the first end of the cushion connecting rod is rotatably connected to the second end of the locking connecting rod via a rotating shaft; the second end of the cushion connecting rod is rotatably connected to the third connecting portion via a rotating shaft; Wherein, during the process of tightening the six-link longitudinal folding frame from the unfolded state to the folded state, the locking link rotates around the middle of the crossbeam link from the second end of the crossbeam link to the first end of the crossbeam link and is embedded in the long strip groove; During the process of the six-link longitudinal folding frame being opened from the folded state to the unfolded state, the locking link rotates around the middle of the crossbeam link from the first end of the crossbeam link to the second end of the crossbeam link and is embedded in the long strip groove.

2. The six-link longitudinal folding frame according to claim 1, wherein: The cushion connecting rod also includes: The seat cushion connecting portion is connected to the first end of the seat cushion connecting rod.

3. The six-link longitudinal folding frame according to claim 1, wherein: The shock absorber is a spring shock absorber, a spring-air damping shock absorber, a hydraulic damping shock absorber or an oil-air combined front fork shock absorber.

4. The six-link longitudinal folding frame according to claim 1, wherein: The flat fork connecting rod also includes: The reinforcing rib is fixedly arranged at the middle part of the flat fork connecting rod, and the reinforcing rib and any two sides of the flat fork connecting rod form a triangular structure.

5. A three-wheeled bicycle using the six-link longitudinal folding frame according to any one of claims 1 to 4, comprising: Front wheels, two of which are provided; A front fork, the front fork is U-shaped, and two branches at one end of the U-shaped opening are rotatably connected to the front wheel through a rotating shaft; The front fork is connected to the front fork connecting portion of the seat tube connecting rod; A handle fixedly connected to the handle connecting portion of the riser connecting rod; A seat cushion, fixedly connected to the seat cushion connecting rod; The seat is fixedly connected to the middle part of the flat fork connecting rod.

6. The inverted three-wheeled bicycle according to claim 5, wherein: Also includes: A sprocket is rotatably connected to one end of the reinforcing rib via a rotating shaft; A crank, wherein the crank is fixedly connected to the sprocket, and the sprocket is rotatably connected to one end of the flat fork connecting rod having a reinforcing rib via a rotating shaft; A rear wheel, the rear wheel being rotatably connected to the third end of the flat fork link via a rotating shaft; the third end of the flat fork link is adjacent to the second end of the flat fork link; A chain is meshed and connected with the sprocket and the rear wheel respectively.

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