A small volume high strength bicycle frame

Abstract

This utility model discloses a compact and high-strength bicycle frame, belonging to the field of bicycle frame technology. It includes a seatpost, front crossbeam, rear crossbeam, and rear fork. Through specific angle designs and welding connections, the frame is kept compact while significantly improving overall structural strength and stability. The rear crossbeam forms an angle of 120° to 140° with the front crossbeam, and the rear fork forms an angle of 105° to 120° with the seatpost. The components are connected using a gradually tapering structure (thinner at the front, thicker at the rear) and welded together, effectively dispersing stress and enhancing impact resistance. This frame is suitable for urban commuting and leisure riding, combining lightweight design, high rigidity, riding comfort, and safety.

Description

Technical Field

[0001] This invention relates to a compact and high-strength bicycle frame, belonging to the field of bicycle frame technology. Background Technology

[0002] As a green and convenient mode of transportation, the bicycle's frame is the core component that determines the overall performance, safety, and riding experience. With the increasing demand for urban commuting and leisure cycling, the market has placed clear demands on bicycles for lightweight, compactness, and high strength, leading to the widespread adoption of portable models such as folding bikes and small-wheeled bikes. Currently, the mainstream small-volume bicycle frame structures are mainly divided into two categories: one is a simplified version of the traditional diamond-shaped frame, and the other is a single-beam or irregular-beam structure. While these designs have made some progress in reducing weight and size, they still have several obvious technical shortcomings. In pursuit of small size and lightweight, many frames have oversimplified their structure, reducing necessary support triangles or using excessively thin tubing, resulting in insufficient overall frame rigidity. During riding, especially on bumpy roads or during acceleration, the frame is prone to deformation or wobbling, affecting not only handling precision but also posing safety hazards and easily leading to metal fatigue, shortening its lifespan.

[0003] In traditional designs, the connection between the rear fork, seat post, and crossbeam is often a right-angle or small-angle joint. This structure is prone to creating stress concentration zones at the connection points when subjected to stress (especially vertical impact and longitudinal torsion), becoming a weak point in the frame structure. After long-term use, cracks or even breakage can easily occur at these points.

[0004] Existing small-volume frames often suffer from structural limitations, making it difficult to optimize riding geometry. Inappropriately designed parameters such as seatpost angle and fork angle can lead to awkward riding postures, and the frame's poor absorption and cushioning of road vibrations can easily cause rider fatigue on long rides. Many frames are also not designed with adequate consideration for accessory integration; for example, the installation of taillights, mudguards, and luggage racks requires additional adapters, which not only increase weight and affect the aesthetics but also often result in poor connection stability. Utility Model Content

[0005] The purpose of this invention is to enhance the overall rigidity and stability of the frame, optimize riding posture, and improve comfort and safety through welding structure and specific angle design.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a small-volume, high-strength bicycle frame, including a seat post, a seat slot at the center of the seat post, a rear crossbeam connected to the front side of the seat post, a front crossbeam connected to the front side of the rear crossbeam, a sealed bottom end of the seat post, a bottom bracket through hole at the front of the bottom of the seat post, an angle of 120° to 140° between the rear crossbeam and the front crossbeam, a taillight connection slot at the rear side of the seat post, a taillight connector fixedly connected in the taillight connection slot, a rear fork below the taillight connector, the rear fork being fixedly connected to the seat post, the rear fork including a left rear fork and a right rear fork, the connection between the left and right rear forks being arc-shaped.

[0007] According to the above technical solution, the tops of the left and right rear forks form an angle of 105 to 120° with the seat tube.

[0008] According to the above technical solution, the top of the rear crossbeam forms an angle of 110 to 130° with the seat tube.

[0009] According to the above technical solution, a head tube connector is fixedly connected to the front end of the front crossbeam.

[0010] According to the above technical solution, the taillight connector is provided with raised strips around its perimeter, and a through groove is opened horizontally in the middle of the raised strips.

[0011] According to the above technical solution, the rear end of the left rear fork and the rear end of the right rear fork are both provided with rear wheel slots, and the two rear wheel slots are coaxially aligned.

[0012] According to the above technical solution, the left and right rear forks are thicker at the front and thinner at the rear, and are welded and fixed to the seat tube.

[0013] According to the above technical solution, both the rear crossbeam and the front crossbeam are thinner at the front and thicker at the back. The rear crossbeam is welded and fixed to the seat tube, and the rear crossbeam is welded and fixed to the front crossbeam.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are that the rear crossbeam and the front crossbeam adopt an angle design of 120° to 140°, combined with the reasonable angle between the rear fork and the seat post, which effectively disperses the impact force generated during riding, improves the overall rigidity and torsional performance of the frame, and the rear fork, rear crossbeam and front crossbeam all adopt a gradual structure that is thinner at the front and thicker at the rear, and are fixed by welding, which enhances the load-bearing capacity of the connection and extends the service life of the frame. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a perspective view of the present invention; Figure 2This is a side view of the present invention; Figure 3 This is an enlarged view of region A of this utility model; In the diagram: 1. Seat tube; 2. Rear crossbeam; 3. Front crossbeam; 31. Head tube connector; 4. Bottom bracket through hole; 6. Taillight connector; 61. Raised strip; 62. Through groove; 7. Rear fork; 71. Left rear fork; 72. Right rear fork; 73. Rear wheel slot. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] See Figure 1 This utility model provides a technical solution: a small-volume, high-strength bicycle frame, including a seat post 1, a seat slot in the center of the seat post 1, a rear crossbeam 2 connected to the front of the seat post 1, a front crossbeam 3 connected to the front of the rear crossbeam 2, a sealed bottom end of the seat post 1, a bottom axle through hole 4 on the front of the bottom of the seat post 1, a 130° angle between the rear crossbeam 2 and the front crossbeam 3, a taillight connection slot on the rear of the seat post 1, a taillight connector 6 fixedly connected in the taillight connection slot, a rear fork 7 below the taillight connector 6, the rear fork 7 being fixedly connected to the seat post 1, the rear fork 7 including a left rear fork 71 and a right rear fork 72, the connection between the left rear fork 71 and the right rear fork 72 being arc-shaped.

[0018] The tops of the left rear fork 71 and the right rear fork 72 form an angle of 110° with the seat tube 1. The top of the rear crossbeam 2 forms an angle of 120° with the seat tube 1. The front crossbeam 3 is fixedly connected to the head tube connector 31 at its front end.

[0019] The taillight connector 6 is provided with raised strips 61 around its perimeter, and a through groove 62 is provided horizontally in the middle of the raised strips 61.

[0020] Both the rear end of the left rear fork 71 and the rear end of the right rear fork 72 have rear wheel slots 73, and the two rear wheel slots 73 are coaxially aligned. The left rear fork 71 and the right rear fork 72 are thicker at the front and thinner at the rear, and are welded and fixed to the seat tube 1.

[0021] Both the rear crossbeam 2 and the front crossbeam 3 are thinner at the front and thicker at the back. The rear crossbeam 2 is welded and fixed to the seat tube 1, and the rear crossbeam 2 is welded and fixed to the front crossbeam 3.

[0022] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, these obvious variations or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A compact and high-strength bicycle frame, characterized in that, The seat includes a seat post (1), a seat slot is provided in the center of the seat post (1), a rear crossbeam (2) is connected to the front side of the seat post (1), a front crossbeam (3) is connected to the front side of the rear crossbeam (2), the bottom end of the seat post (1) is sealed, a central shaft through hole (4) is provided on the front side of the bottom of the seat post (1), an angle of 120° to 140° is formed between the rear crossbeam (2) and the front crossbeam (3), a taillight connecting groove is provided on the rear side of the seat post (1), a taillight connector (6) is fixedly connected in the taillight connecting groove, a rear fork (7) is provided below the taillight connector (6), the rear fork (7) is fixedly connected to the seat post (1), the rear fork (7) includes a left rear fork (71) and a right rear fork (72), and the connection between the left rear fork (71) and the right rear fork (72) is arc-shaped.

2. The compact, high-strength bicycle frame according to claim 1, characterized in that, The tops of the left rear fork (71) and the right rear fork (72) form an angle of 105 to 120° with the seat tube (1).

3. The compact, high-strength bicycle frame according to claim 2, characterized in that, The top of the rear crossbeam (2) forms an angle of 110 to 130° with the seat tube (1).

4. The compact, high-strength bicycle frame according to claim 3, characterized in that, The front end of the front crossbeam (3) is fixedly connected to the head tube connector (31).

5. A compact, high-strength bicycle frame according to claim 4, characterized in that, The taillight connector (6) is provided with a raised strip (61) around its perimeter, and a through groove (62) is provided in the middle of the raised strip (61).

6. A compact, high-strength bicycle frame according to claim 5, characterized in that, The rear end of the left rear fork (71) and the rear end of the right rear fork (72) are both provided with rear wheel slots (73), and the two rear wheel slots (73) are coaxially aligned.

7. A compact, high-strength bicycle frame according to claim 6, characterized in that, The left rear fork (71) and right rear fork (72) are thicker at the front and thinner at the rear and are welded to the seat tube (1).

8. A compact, high-strength bicycle frame according to claim 7, characterized in that, Both the rear crossbeam (2) and the front crossbeam (3) are thinner at the front and thicker at the back. The rear crossbeam (2) is welded and fixed to the seat tube (1), and the rear crossbeam (2) is welded and fixed to the front crossbeam (3).

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