Bicycle frame structure

Abstract

The utility model discloses a bicycle frame structure which comprises a front triangle formed by an upper tube, a lower tube, a head tube, a seat tube and a five-way joint and a rear triangle formed by a rear upper fork and a rear lower fork, and the upper tube, the lower tube, the head tube, the seat tube and the five-way joint are made of PBO fiber materials and are formed after being soaked in epoxy resin. The rear upper fork and the rear lower fork are made of PBO fiber materials and are formed after being soaked in epoxy resin. According to the frame structure, high-strength PBO fiber materials are adopted, and the epoxy resin impregnation forming technology is combined, so that good balance of light weight and high strength is achieved. And welding parts are reduced through the integral forming design, and the overall rigidity and impact resistance of the frame are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycles and discloses a bicycle frame structure. Background Art

[0002] With the increasing diversification of modern transportation and people's pursuit of a healthier lifestyle, bicycles are increasingly popular as a green, environmentally friendly, and physically demanding mode of transportation. Especially in cities, bicycles, due to their convenience and low carbon emissions, are becoming an ideal choice for short-distance commuting and outdoor activities. To meet the needs of diverse riders, bicycle design and manufacturing technologies are constantly being innovated and optimized. As a crucial component of a bicycle, the frame has a crucial impact on its overall performance. Traditional bicycle frames are typically made of steel, aluminum alloy, or carbon fiber, each with its own advantages and disadvantages. While steel offers strength, it is also heavy, hindering riding efficiency. Aluminum alloy is widely used due to its lightweight advantages, but its shock resistance and rigidity are somewhat inferior. Carbon fiber frames offer both lightness and strength, but they are more expensive to manufacture and are susceptible to damage from external forces.

[0003] In recent years, the research and development of new materials has brought new opportunities for the improvement of bicycle frames. PBO fiber (poly(phenylene terephthalate) benzoxazole fiber) is an emerging high-performance fiber material with excellent tensile strength, fatigue resistance and impact resistance. In the fields of aerospace, military equipment, etc., PBO fiber has been widely used. Its light weight and durability make it an ideal choice for high-strength applications. However, the research on the application of PBO fiber in bicycle frames is still in the exploratory stage, and the main technical bottleneck lies in the molding and connection process of the material. Therefore, how to use PBO fiber materials to make lightweight, high-strength bicycle frames to improve riding efficiency and durability has become an important research direction in the field of bicycle manufacturing. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a bicycle frame structure.

[0005] The technical solutions provided by this utility model are as follows:

[0006] A bicycle frame structure includes a front triangle formed by a top tube, a down tube, a head tube, a seat tube, and a bottom bracket, and a rear triangle formed by a seat fork and a chain stay. The top tube, the down tube, the head tube, the seat tube, and the bottom bracket are made of a PBO fiber material and are formed after being impregnated with epoxy resin. The seat fork and the chain stay are also made of a PBO fiber material and are formed after being impregnated with epoxy resin.

[0007] The top tube, down tube, head tube, seat tube and bottom bracket are molded in one piece.

[0008] The seat stays are integrally formed with the seat tube, while the chain stays are integrally formed with the bottom bracket shell.

[0009] The upper end of the seat tube is tilted toward the rear triangle, and the inclination angle of the seat tube is 15-20 degrees.

[0010] The upper end of the head tube is tilted toward the seat tube, and the inclination angle of the head tube is 17-19 degrees.

[0011] A first water bottle cage for placing a water bottle is fixed on the down tube.

[0012] A second bottle cage for placing a water bottle is fixed on the seat tube.

[0013] In summary, the beneficial effects of the present invention are as follows:

[0014] (1) The present invention provides a bicycle frame structure based on PBO fiber material, which overcomes the shortcomings of traditional frame materials through unique material selection and one-piece molding process. Specifically, PBO fiber material has excellent lightweight and impact resistance properties, which greatly reduces the weight of the frame while ensuring high strength, helping to improve riding efficiency. In addition, the composite molding of PBO fiber and epoxy resin gives the frame better fatigue resistance and weather resistance during use, making it adaptable to a variety of complex environments.

[0015] (2) The frame of the utility model adopts an integrated molding design, connecting the top tube, down tube, head tube, seat tube and bottom bracket into one body, reducing the number of welding parts, thereby reducing the risk of stress concentration and improving the rigidity and durability of the frame. At the same time, the inclined seat tube and head tube design enhance the aerodynamic performance, making riding more labor-saving. The reasonable arrangement of the water bottle cage also provides convenient hydration conditions for long-distance riding. Overall, the present invention not only achieves innovation in material selection, but also optimizes the structural design and molding process, achieving the effect of taking into account lightweight, high strength, durability and comfort, and providing new ideas and implementation methods for the design and manufacture of bicycle frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the frame structure.

[0017] The reference numerals are as follows:

[0018] 1. Top tube; 2. Down tube; 3. Head tube; 4. Seat tube; 5. Bottom bracket; 6. Seat stays; 7. Chain stays; 8. First bottle cage; 9. Second bottle cage. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0020] like Figure 1 As shown, the present application provides a bicycle frame structure comprising a front triangle and a rear triangle. The front triangle comprises a top tube 1, a down tube 2, a head tube 3, a seat tube 4, and a bottom bracket 5; the rear triangle comprises a seat stay 6 and a chain stay 7. These tubes and connecting components together form the basic framework of the frame.

[0021] The front triangle is the core of a bicycle frame, supporting the weight and bearing the force of riding. It specifically includes the following components: The top tube 1 sits atop the frame and connects to the head tube 3 and seat tube 4, providing stability and connection.

[0022] The top tube 1 is hollow to reduce weight and increase strength. The down tube 2 is located at the bottom of the frame and is connected to the head tube 3 and the bottom bracket 5. It is one of the backbones of the entire frame.

[0023] The lower tube 2 has a high rigidity to support various forces generated during riding.

[0024] The head tube 3 is located at the front end of the frame, connected to the top tube 1 and down tube 2, and connected to the front fork, providing support for the handlebars and front wheel. The head tube 3 is hollow inside to accommodate the handlebar steering mechanism.

[0025] The seat tube 4 is a support member connecting the top tube 1 and the bottom bracket 5. It is used to fix the seat post and provide seat support for the rider. The seat tube 4 is tilted to improve riding comfort.

[0026] The bottom bracket 5 is the bottom connection structure of the bicycle frame, connected to the down tube 2 and seat tube 4, and provides a mounting location for the pedals. The bottom bracket 5 is a key part of transmitting pedaling force. The rigidity of the bottom bracket 5 has a significant impact on the pedaling efficiency of the bicycle.

[0027] The rear triangle structure consists of a seat stay 6 and a chain stay 7, which connect the seat tube 4 and the bottom bracket 5 to provide support for the rear wheel. It also has a certain degree of elasticity and strength to cope with the impact and pressure during riding.

[0028] The seat stay 6 connects the seat tube 4 and the rear wheel, and together with the chain stay 7, forms the rear wheel support structure. The seat stay 6 is made of a strong material and has a lightweight design to enhance stability.

[0029] The chain stay 7 connects the bottom bracket 5 and the rear wheel, and supports the rear wheel together with the seat stay 6. The chain stay 7 has a certain degree of flexibility to disperse vibrations during riding.

[0030] To facilitate carrying a water bottle during cycling, this embodiment features bottle cages on both the down tube 2 and the seat tube 4. One bottle cage is secured to the down tube 2 for holding a first water bottle, making it easy to access water while cycling. A second bottle cage 9 is secured to the seat tube 4 for holding a spare water bottle, ensuring hydration during extended rides. Both cages are secured with bolts, ensuring stability and easy installation.

[0031] Furthermore, the main frame structure of the present application utilizes PBO fiber material, which has advantages such as high strength and excellent impact resistance. PBO fiber, short for poly-p-phenylene benzobisoxazole, is a composite material reinforcement developed in the United States in the 1980s for the development of aerospace. In terms of performance, PBO fiber possesses excellent physical, mechanical, and chemical properties. Its strength not only exceeds that of steel fiber but also surpasses that of carbon fiber. Furthermore, PBO fiber exhibits excellent shear fracture resistance, friction resistance, and dimensional stability.

[0032] The frame forming process of this embodiment is as follows:

[0033] First, the PBO fiber material is cut into fiber sheets that meet the required dimensions for the top tube 1, down tube 2, head tube 3, seat tube 4, and bottom bracket 5. The cut PBO fiber sheets are then stacked according to the specified dimensions and impregnated with epoxy resin to ensure full fiber saturation. The impregnated fiber sheets are then placed in a mold and cured under high temperature and high pressure to firmly bond the epoxy resin to the PBO fiber, ultimately forming the basic shapes of each component. Finally, after further processing, the individual tubes are formed to achieve exceptional strength and lightweight, followed by finishing and polishing to ensure assembly precision.

[0034] In some preferred embodiments, the top tube 1, down tube 2, head tube 3, seat tube 4, and bottom bracket 5 of the front triangle can be integrally molded using a single mold, eliminating the need for welding and connecting components. This integrated molding design reduces stress concentration at the joints, further enhancing the overall strength and stability of the frame.

[0035] One-piece molding technology can also be used between the upper and lower forks 6 and 7 and the seat tube 4, making the rear triangle and the front triangle more integrated, improving the overall stability, and increasing the durability of the frame, making it suitable for high-intensity riding and complex road conditions.

[0036] As another embodiment of further optimization, in order to increase the comfort and controllability of the frame, the present invention designs an inclined seat tube 4 and head tube 3 structure:

[0037] The upper end of the seat tube 4 is tilted toward the rear triangle at an angle of 15-20 degrees. This design can lower the center of gravity, improve the stability of the frame at high speeds, and improve the rider's sitting comfort.

[0038] The upper end of the head tube 3 is tilted toward the seat tube 4 at an angle of 17-19 degrees. This tilt enhances maneuverability and allows the rider to maneuver more nimbly during turns. It also helps reduce air resistance during riding, improving riding efficiency.

[0039] In summary, the bicycle frame structure of the present invention achieves a good balance between lightweight and high strength by adopting high-strength PBO fiber material and combining it with an epoxy resin impregnation molding process. In addition, the one-piece molding design reduces the number of welds, thereby improving the overall rigidity and impact resistance of the frame. The inclined seat tube 4 and head tube 3 design give the frame better aerodynamic performance and enhance riding comfort and controllability. The provision of a water bottle cage further enhances the practicality of the frame, making it particularly suitable for long-term riding needs.

[0040] It should be noted that any implementations not shown or described in the drawings or the main text of the specification are known to those skilled in the art and are not described in detail. In addition, the above definitions of the various elements and methods are not limited to the various specific structures, shapes, or methods mentioned in the embodiments.

[0041] It should also be noted that while examples of parameters including specific values ​​may be provided herein, these parameters do not need to be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error tolerances or design constraints. Directional terms mentioned in the embodiments, such as "upper," "lower," "front," "back," "left," "right," "inner," and "outer," are merely references to the directions in the accompanying drawings and are not intended to limit the scope of protection of this application.

[0042] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge of the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A bicycle frame structure, characterized in that: The invention comprises a front triangle formed by an upper tube (1), a lower tube (2), a head tube (3), a seat tube (4) and a bottom bracket (5), and a rear triangle formed by a seat fork (6) and a chain stay (7). The upper tube (1), the lower tube (2), the head tube (3), the seat tube (4) and the bottom bracket (5) are made of PBO fiber material and are formed after being impregnated with epoxy resin. The seat fork (6) and the chain stay (7) are made of PBO fiber material and are formed after being impregnated with epoxy resin.

2. The bicycle frame structure according to claim 1, wherein: The upper tube (1), the lower tube (2), the head tube (3), the seat tube (4), and the bottom bracket (5) are integrally formed.

3. The bicycle frame structure according to claim 2, wherein: The upper fork (6) and the seat tube (4) are integrally formed, and the lower fork (7) and the five-way bracket (5) are integrally formed.

4. The bicycle frame structure according to claim 1, wherein: The upper end of the seat tube (4) is inclined toward one side of the rear triangle, and the inclination angle of the seat tube (4) is 15-20°.

5. The bicycle frame structure according to claim 1, wherein: The upper end of the head tube (3) is inclined toward one side of the seat tube (4), and the inclination angle of the head tube (3) is 17-19°.

6. The bicycle frame structure according to claim 1, wherein: A first kettle rack (8) for placing a kettle is fixed on the lower tube (2).

7. The bicycle frame structure according to claim 6, wherein: A second water bottle holder (9) for placing a water bottle is fixed on the seat tube (4).

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