A one-piece molded front triangle folding bicycle frame

Abstract

This utility model discloses a one-piece molded front triangle folding bicycle frame, including a rear folding frame and a front folding frame. The rear folding frame is connected to the front folding frame via a folding box. The rear folding frame includes a center tube, a bottom bracket tube, a rear frame, and a rear beam tube connected to the folding box. The rear beam tube includes a crossbeam and a diagonal beam. The bottom bracket tube is connected to the bottom side of the center tube, and the rear frame is connected to the other side of the center tube. The center tube and the rear beam tube form the front triangle. The front folding frame includes a front beam tube and a front frame. One end of the front beam tube is connected to the folding box, and the other end is connected to the front frame. This utility model features high strength, more even stress distribution in the front triangle load-bearing area, good overall frame stability, no loosening under external force, good safety, relatively even stress distribution, and excellent load-bearing capacity.

Description

Technical Field

[0001] This utility model relates to the technical field of bicycle frames, and in particular to a one-piece molded front triangle folding bicycle frame. Background Technology

[0002] Folding bicycles are a type of bicycle. Generally, folding bicycles consist of a folding frame joint and a folding seat tube joint. By folding the frame, the front and rear wheels are folded together, reducing the length by about 45%. Folding bicycles are convenient to carry and use, comfortable, and have a mature manufacturing process. The bottom tube of a folding bicycle connects the seat and the front and rear wheel frames. The bottom tube is connected to the front wheel frame via the main frame tube, which uses a folding joint. The main frame tube can be folded in the middle. From the folding point, the main frame tube can be divided into the front and rear main frame tubes. Currently, the rear main frame tube, bottom bracket, and folding mechanism are only welded together at the bottom by a small-diameter reinforcing tube. The thickness difference between the rear main frame tube, bottom tube, and reinforcing tube is very large, weakening its vertical load-bearing capacity. From the perspective of frame structure load-bearing capacity, it does not achieve optimal strength. Utility Model Content

[0003] The purpose of this invention is to optimize the load-bearing capacity of folding bicycle frames by proposing a one-piece molded front triangle folding bicycle frame. This design creates a more even and robust vertical load-bearing structure in the front triangle area of ​​the frame in front of the center tube, thereby improving the load-bearing capacity of the bicycle frame.

[0004] To achieve the above objectives, this utility model proposes a front triangle integrated folding bicycle frame, including a rear folding frame and a front folding frame. The rear folding frame is connected to the front folding frame via a folding box. The rear folding frame includes a center tube, a bottom bracket tube, a rear frame, and a rear beam tube connected to the folding box. The rear beam tube includes a crossbeam and a diagonal beam. One end of the crossbeam is integrally connected to one end of the diagonal beam, and the other end of the crossbeam is connected to the upper side of one side of the center tube. The diagonal beam is connected to the lower side of one side of the center tube. The bottom bracket tube is connected to the bottom side of the center tube. The rear frame is connected to the other side of the center tube. The center tube and the rear beam tube form the front triangle. The front folding frame includes a front beam tube and a front frame. One end of the front beam tube is connected to the folding box, and the other end of the front beam tube is connected to the front frame.

[0005] This solution integrates the existing rear frame main tube and reinforcing tube into a single rear beam tube structure. The integrated rear beam tube includes a crossbeam (rear frame main tube) and a diagonal beam (reinforcing tube). The crossbeam and diagonal beam are connected to each other at one end and to the center tube at the other end. In this way, the rear beam tube and the center tube form a front triangle. The triangle has high strength, even stress distribution, and high aesthetics, and can improve the vertical load-bearing capacity of the front triangle area of ​​the frame in front of the center tube. The rear beam tube can be made by casting.

[0006] As a preferred embodiment of this utility model, the rear beam tube is a hollow tube, the shape of the connecting end port of the crossbeam and the inclined beam is the same as the shape of the front beam tube port, and the connecting end port of the crossbeam and the inclined beam and the front beam tube port respectively extend into the folding box and are welded and fixed to the folding box.

[0007] In a preferred embodiment of this utility model, the outer diameter of the crossbeam is close to the diameter of the middle tube, and the outer diameter of the diagonal beam gradually decreases from the end connected to the crossbeam to the end connected to the middle tube. The end of the diagonal beam connected to the middle tube is also connected and fixed to the bottom bracket pipe. In this embodiment, the shape and diameter of the front end of the rear frame main tube (i.e., the end where the crossbeam and diagonal beam connect) at the connection with the folding box are the same as those of the front frame main tube. The rear end of the rear frame main tube is divided into a crossbeam and a diagonal beam. The diameter of the crossbeam is close to that of the middle tube, which facilitates welding and fixing the two. The diameter of the diagonal beam gradually decreases before being welded and fixed together with the middle tube and the bottom bracket pipe.

[0008] In a preferred embodiment of this invention, the connection ports of the crossbeam and the inclined beam, and the front beam tube port, are respectively provided with a reduced step located outside the port or an enlarged step sleeve located inside the port. The reduced step outside the port forms an annular ring with a reduced outer diameter on the outer side of the port, while the enlarged step sleeve inside the port forms an annular groove with an enlarged inner diameter on the inner side of the port. The sizes of the annular ring and the annular groove are matched, allowing the front beam tube and the rear beam tube to form a partially inserted structure within the folding box, improving the connection strength when they are connected. Simultaneously, the front beam tube and the rear beam tube can be separated when folding is required.

[0009] In a preferred embodiment of this invention, the rear frame includes two upper forks, two lower forks, and two hooks. The front ends of the two upper forks are connected to one side of the center tube, and the front ends of the two lower forks are connected to one side of the center tube and the bottom bracket tube, respectively. The rear ends of the two upper forks are each connected to the rear end of a lower fork via a hook. The outer surface of the bottom of the center tube is welded to the rear side of the bottom bracket tube. This design connects the rear frame and the front tripod to form a single unit via the center tube, which improves the overall integrity of the rear wheel frame connection and enhances connection strength.

[0010] As a preferred embodiment of this utility model, a connecting reinforcing tube is provided between the two upper forks, and a connecting reinforcing plate is provided between the two lower forks.

[0011] The beneficial effects of this utility model are as follows: This utility model integrally molds the rear beam tube, which is provided with a front port, an upper port, and a lower port. The upper port of the rear beam tube is fixedly connected to the top of the middle tube, and the lower port of the rear beam tube is fixedly connected to the top of the bottom bracket and the front side of the bottom of the middle tube. The front port of the rear beam tube is connected to the rear side of the folding box, and the front side of the folding box is connected to the front beam tube. The middle tube and the rear beam tube form a front triangle, so that the rear beam tube and the lower reinforcing tube of the folding vehicle form a high-strength integrated structure. Furthermore, the front end of the rear beam tube is sleeved and welded to the rear of the folding box, which ensures that the stress in the front triangle load-bearing area of ​​the frame is more even, the overall frame is more robust, the frame has high strength, and will not loosen under external force, providing good safety and relatively even stress distribution.

[0012] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 yes Figure 1 Side view of the structure.

[0015] Figure 3 This is a schematic diagram of a rear frame structure according to the present invention.

[0016] In the diagram: 1-Rear folding frame, 2-Front folding frame, 3-Folding box, 4-Side tube, 5-Bottom tube, 6-Crossbeam, 7-Diagonal beam, 8-Front beam tube, 9-Top fork, 10-Lower fork, 11-Claw hook, 12-Connecting reinforcement tube, 13-Connecting reinforcement plate. Detailed Implementation

[0017] See Figures 1-3 ,

[0018] A one-piece molded front triangle folding bicycle frame includes a rear folding frame 1 and a front folding frame 2. The rear folding frame 1 is connected to the front folding frame 2 via a folding box 3. The rear folding frame 1 includes a center tube 4, a bottom bracket tube 5, a rear frame, and a rear beam tube connected to the folding box 3. The rear beam tube includes a crossbeam 6 and a diagonal beam 7. One end of the crossbeam 6 is integrally connected to one end of the diagonal beam 7, and the other end of the crossbeam 6 is connected to the upper side of one side of the center tube 4. The diagonal beam 7 is connected to the lower side of one side of the center tube 4. The bottom bracket tube 5 is connected to the bottom side of the center tube 4. The rear frame is connected to the other side of the center tube 4. The center tube 4 and the rear beam tube form the front triangle. The front folding frame 2 includes a front beam tube 8 and a front frame. One end of the front beam tube 8 is connected to the folding box 3, and the other end of the front beam tube 8 is connected to the front frame.

[0019] The horizontal beam 6 and the diagonal beam 7 of the rear beam tube are hollow tubes. The shape of the end of the horizontal beam 6 and the diagonal beam 7 is the same as the shape of the end of the front beam tube 8. The end of the horizontal beam 6 and the diagonal beam 7 and the end of the front beam tube 8 extend into the folding box 3 and are welded and fixed to the folding box 3. The folding box 3 includes hinged front and rear boxes. The front and rear boxes are welded and fixed to the rear beam tube or the front beam tube respectively.

[0020] The outer diameter of the crossbeam 6 is close to that of the middle tube 4. The outer diameter of the inclined beam 7 gradually decreases from the end connected to the crossbeam 6 to the end connected to the middle tube 4. The end of the inclined beam 7 connected to the middle tube 4 is also connected and fixed to the five-way pipe 5.

[0021] The connection ports of the crossbeam 6 and the inclined beam 7, and the port of the front beam tube 8, are respectively provided with a reduced step located outside the port or an enlarged step sleeve located inside the port.

[0022] The rear frame includes two upper forks 9, two lower forks 10, and two claw hooks 11. The front ends of the two upper forks 9 are connected to one side of the center tube 4, and the front ends of the two lower forks 10 are connected to one side of the center tube 4 and the bottom bracket tube 5, respectively. The rear ends of the two upper forks 9 are connected to the rear end of one lower fork 10 through a claw hook 11. The bottom outer surface of the center tube 4 is welded to the rear side of the bottom bracket tube 5.

[0023] A connecting reinforcing tube 12 is provided between the two upper forks 9, and a connecting reinforcing plate 13 is provided between the two lower forks 10.

[0024] The working process of this utility model:

[0025] In this invention, one end of the crossbeam 6 of the rear beam tube is fixedly connected to the top of the middle tube 4, and one end of the diagonal beam 7 of the rear beam tube is fixedly connected to the top of the five-way tube 5 and the front bottom of the middle tube 4. The connecting end of the crossbeam 6 and the diagonal beam 7 is connected to the rear side of the folding box 3. The middle tube 4 and the rear beam tube form the front triangle frame. This invention changes the traditional structure of the rear beam tube with a small reinforcing tube. It adopts a combination of the rear beam tube and the reinforcing tube to form a high-strength integrated structure in the front triangle area of ​​the folding vehicle. Furthermore, the front end of the rear beam tube is connected to the rear of the folding box 3 by a sleeve and welding, which ensures that the force on the load-bearing area of ​​the front triangle of the frame is more even. The overall frame has good sturdiness and high strength. It will not loosen under external force, has good safety, and the force is relatively even, which can well complete the load work of the entire frame.

[0026] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A front triangle unibody folding bicycle frame, characterized by: It includes a rear folding frame and a front folding frame, wherein the rear folding frame is connected to the front folding frame via a folding box; The rear folding frame includes a center tube, a bottom bracket tube, a rear frame, and a rear beam tube connected to the folding box. The rear beam tube includes a crossbeam and a diagonal beam. One end of the crossbeam is integrally connected to one end of the diagonal beam. The other end of the crossbeam is connected to the upper side of one side of the center tube. The diagonal beam is connected to the lower side of one side of the center tube. The bottom bracket tube is connected to the bottom side of the center tube. The rear frame is connected to the other side of the center tube. The center tube and the rear beam tube form a front triangle. The aforementioned front folding frame includes a front beam tube and a front frame. One end of the front beam tube is connected to the folding box, and the other end of the front beam tube is connected to the front frame.

2. A front triangle unibody folding bicycle frame as claimed in claim 1, wherein: The rear beam tube is a hollow tube. The shape of the connecting end of the crossbeam and the diagonal beam is the same as the shape of the front beam tube. The connecting end of the crossbeam and the diagonal beam and the front beam tube are respectively inserted into the folding box and welded and fixed to the folding box.

3. A front triangle unibody folding bicycle frame as claimed in claim 2, wherein: The outer diameter of the crossbeam is close to the diameter of the middle tube, and the outer diameter of the inclined beam gradually decreases from the end connected to the crossbeam to the end connected to the middle tube. The end of the inclined beam connected to the middle tube is also connected and fixed to the five-way pipe.

4. A front triangle unitary foldable bicycle frame as claimed in claim 2, wherein: The connection port between the crossbeam and the inclined beam, and the port of the front beam tube are respectively provided with a reduced step outside the port or an enlarged step sleeve inside the port.

5. A front triangle unitary foldable bicycle frame as claimed in claim 1, wherein: The rear frame includes two upper forks, two lower forks, and two claw hooks. The front ends of the two upper forks are respectively connected to one side of the center tube, and the front ends of the two lower forks are respectively connected to one side of the center tube and the bottom bracket tube. The rear ends of the two upper forks are respectively connected to the rear end of one lower fork through a claw hook. The bottom outer surface of the center tube is welded to the rear side of the bottom bracket tube.

6. A front triangle unibody folding bicycle frame as claimed in claim 5, wherein: A connecting reinforcing tube is provided between the two upper forks, and a connecting reinforcing plate is provided between the two lower forks.

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