A carbon fiber bicycle integrated special-shaped rear upper fork device

Abstract

The utility model belongs to bicycle technical field, and disclose a kind of carbon fiber bicycle integration special-shaped rear upper fork device, including rear upper fork main body, the one end of rear upper fork main body is provided with seat tube connecting end, inner thread is provided on the inner wall of seat tube connecting end, the outside of seat tube connecting end is provided with reinforcing ring, the other end of rear upper fork main body is provided with rear wheel axle connecting end, U type clamping groove is equipped on rear wheel axle connecting end, the middle position of rear upper fork main body is provided with special-shaped section, shock-absorbing component is arranged between special-shaped section and rear upper fork main body, the position of rear upper fork main body close to seat tube connecting end is provided with reinforcing rib, the basis fastening of seat tube and connecting end is ensured by inner thread, reinforcing ring is further limited radial deformation of connecting end by bolt clamping, compared with single thread connection, improve radial torsional stiffness, avoid seat tube loosening in cycling;The detachability of bolt connection facilitates seat tube maintenance or replacement in later period.

Description

Technical Field

[0001] This utility model belongs to the field of bicycle technology, specifically a carbon fiber bicycle integrated irregular-shaped rear upper fork device. Background Technology

[0002] As a core component connecting the seatpost and the rear wheel axle, the reliability of the seat connection and the shock absorption performance of the bicycle seat fork directly affect the riding experience and the service life of the component. In the current technology, the connection between the seatpost and the seatpost mostly adopts a single internal thread structure. This structure can only achieve basic fastening and lacks radial torsional stiffness. During riding, the seatpost is prone to loosening due to road bumps. At the same time, traditional seat forks do not have a shock absorption structure, which cannot effectively absorb road vibrations, causing fatigue in the rider's buttocks and waist, thus affecting the riding experience.

[0003] Therefore, a carbon fiber bicycle integrated irregular-shaped rear upper fork device is proposed to address the above problems. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model provides an integrated irregularly shaped rear upper fork device for carbon fiber bicycles. It features a dual fixing structure with internal threads and reinforcing ring bolts, which improves the radial torsional stiffness of the seat post and connecting end to prevent seat post loosening during riding, while also providing detachability for easy maintenance and replacement of the seat post later. At the same time, the return spring in the shock absorption component absorbs low- and medium-frequency road vibrations, the buffer pad weakens high-frequency vibrations, and the cooperation between the positioning screw and the through hole restricts the irregularly shaped section to only move axially, effectively preventing lateral wheel sway, thus combining the advantages of shock absorption and riding stability.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated irregular-shaped rear upper fork device for carbon fiber bicycles, comprising a rear upper fork body, a seat post connection end provided at one end of the rear upper fork body, an internal thread provided on the inner wall of the seat post connection end, a reinforcing ring provided on the outer side of the seat post connection end, a rear wheel axle connection end provided at the other end of the rear upper fork body, a U-shaped groove provided on the rear wheel axle connection end, an irregular-shaped section provided in the middle of the rear upper fork body, a shock-absorbing component provided between the irregular-shaped section and the rear upper fork body, and a reinforcing rib provided on the rear upper fork body near the seat post connection end.

[0006] Preferably, the rear upper fork body is made of carbon fiber prepreg through in-mold integral molding, and the whole has a symmetrical arc-shaped structure.

[0007] Preferably, the reinforcing ring is sleeved on the outside of the seat tube connection end, and the reinforcing ring and the seat tube connection end are provided with through bolt holes, and the reinforcing ring and the seat tube connection end are fixed by bolts passing through the bolt holes.

[0008] Preferably, the inner wall of the U-shaped slot is fitted with a wear-resistant bushing, and the inner surface of the wear-resistant bushing is polished.

[0009] Preferably, the shock absorption assembly includes a limiting protrusion, a positioning screw, a buffer pad, and a return spring. One end of the positioning screw is fixed to the limiting protrusion, the return spring is sleeved on the outside of the positioning screw, and the buffer pads are symmetrically arranged on both sides of the return spring.

[0010] Preferably, the irregular section has a through hole, and the rear upper fork body has a threaded hole corresponding to the through hole, which matches the positioning screw. The positioning screw passes through the through hole and is connected to the threaded hole.

[0011] Preferably, the limiting protrusion and the positioning screw are integrally formed, the buffer pads are respectively between the bottom of the irregular section and the top of the rear upper fork body, and the return spring is disposed between the irregular section and the rear upper fork body.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model ensures the foundation of the seat tube and the connection end is firmly secured by the internal thread, and the reinforcing ring is further restricted by the bolt clamping to limit the radial deformation of the connection end. Compared with a single thread connection, it improves the radial torsional stiffness and prevents the seat tube from loosening during riding; at the same time, the detachability of the bolt connection facilitates the later maintenance or replacement of the seat tube.

[0013] 2. This utility model uses the return spring and buffer pad of the shock absorption component to absorb low- and medium-frequency road vibrations during riding. The buffer pad further weakens high-frequency vibrations. The positioning screw of the shock absorption component is restricted in the through hole, ensuring that the irregular section only moves axially, avoiding wheel sway caused by lateral offset, and balancing shock absorption effect and riding stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the seat tube connection end structure of this utility model; Figure 3 This is a schematic diagram of the shock absorption component structure of this utility model; Figure 4 This is a schematic diagram of the connection structure between the rear upper fork body and the irregular section of this utility model.

[0015] In the diagram: 1. Main body of the rear upper fork; 2. Seatpost connection end; 3. Internal thread; 4. Reinforcing ring; 5. Rear wheel axle connection end; 6. U-shaped groove; 7. Irregular section; Shock absorption components; 81. Limiting protrusion; 82. Positioning screw; 83. Buffer pad; 84. Return spring; 85. Through hole; 86. Threaded hole; 9. Reinforcing ribs; 10. Wear-resistant bushings. 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] The following describes an embodiment of this utility model based on its overall structure.

[0018] like Figures 1 to 4 As shown, this utility model provides an integrated irregularly shaped rear upper fork device for carbon fiber bicycles, including a rear upper fork body 1, which has a hollow structure. One end of the rear upper fork body 1 is provided with a seat post connection end 2, which is integrally formed at the top of the rear upper fork body 1. The inner wall of the seat post connection end 2 is provided with an internal thread 3, and the outer side of the seat post connection end 2 is provided with a reinforcing ring 4, which has an annular structure. The other end of the rear upper fork body 1 is provided with a rear wheel axle connection end 5, which is integrally formed at the bottom of the rear upper fork body 1. The rear wheel axle connection end 5 is provided with a U-shaped groove 6. An irregularly shaped section 7 is provided in the middle of the rear upper fork body 1. The irregularly shaped section 7 is D-shaped. A shock-absorbing component 8 is provided between the irregularly shaped section 7 and the rear upper fork body 1, which is located at the connection between the irregularly shaped section 7 and the rear upper fork body 1. Two sets are symmetrically distributed along the axis of the body. A reinforcing rib 9 is provided on the rear upper fork body 1 near the seat post connection end 2.

[0019] In this embodiment, the rear upper fork body 1 is integrally molded in-mold using carbon fiber prepreg. All integral structures of the rear upper fork body 1 (seat post connection end 2, rear wheel axle connection end 5, etc.) are connected by in-mold co-curing. Toray T700 / T800 grade carbon fiber prepreg is used, and the whole structure is a symmetrical arc shape.

[0020] The reinforcing ring 4 is fitted on the outside of the seat tube connection end 2. The reinforcing ring 4 and the seat tube connection end 2 are provided with through bolt holes. The reinforcing ring 4 and the seat tube connection end 2 are fixed by bolts passing through the bolt holes. The bolts are inserted into the bolt holes from the outside of the reinforcing ring 4, aligned with the threaded holes of the connection end, and slowly screwed in. After tightening, the reinforcing ring 4 clamps the seat tube connection end 2 by the radial force of the bolts.

[0021] The inner wall of the U-shaped slot 6 is fitted with a wear-resistant bushing 10. The inner surface of the wear-resistant bushing 10 is polished to improve the wear resistance of the U-shaped slot 6.

[0022] The shock absorption assembly 8 includes a limiting protrusion 81, a positioning screw 82, a buffer pad 83, and a return spring 84. One end of the positioning screw 82 is fixed to the limiting protrusion 81. The return spring 84 is located on the outside of the positioning screw 82. The buffer pads 83 are symmetrically arranged on both sides of the return spring 84. The return spring 84 is directly sleeved on the outside of the optical axis section of the positioning screw 82. Both ends of the return spring 84 are in contact with the buffer pads 83. After the positioning screw 82 is tightened, the lower surface of the limiting protrusion 81 is tightly fitted with the upper surface of the irregular section 7. Both ends of the return spring 84 are embedded in the central groove of the buffer pad 83 (the buffer pad 83 has a groove with a diameter that matches the outer diameter of the return spring 84) to prevent the return spring 84 from moving laterally and to ensure that the return spring 84 only extends and contracts axially.

[0023] The irregular section 7 has a through hole 85, and the rear upper fork body 1 has a threaded hole 86 that matches the positioning screw 82 at the position corresponding to the through hole 85. The positioning screw 82 passes through the through hole 85 and is connected in the threaded hole 86. The end of the positioning screw 82 near the threaded hole 86 has an external thread that matches it.

[0024] The limiting protrusion 81 and the positioning screw 82 are integrally formed. The buffer pad 83 is attached to the bottom of the irregular section 7 and the top of the rear upper fork body 1 respectively. When vibrating, the buffer pad 83 deforms synchronously with the compression and stretching of the spring to absorb high-frequency vibration. At the same time, it avoids the return spring 84 from rubbing against the rear upper fork body 1, which would cause damage to the carbon fiber surface.

[0025] The working principle and process of an integrated irregularly shaped rear fork device for carbon fiber bicycles: The seatpost is inserted into the seatpost connecting end 2 and fixed by the internal thread 3 on the inner wall engaging with the external thread of the seatpost, achieving a rigid connection between the seatpost and the rear fork; simultaneously, the reinforcing ring 4 on the outer side of the seatpost connecting end 2 is fixed to the seatpost connecting end 2 by bolts passing through the bolt holes, forming a double fixing structure of internal thread connection and reinforcing ring 4 clamping; the rear wheel axle is embedded in the U-shaped groove 6 of the rear wheel axle connecting end 5, and the wear-resistant bushing 10 on the inner wall of the groove directly contacts the rear wheel axle; during riding, airflow flows along the surface of the irregularly shaped section 7, which can reduce the resistance generated by air vortices; when the bicycle travels over bumpy roads, the vertical impact on the rear wheel is absorbed through... The vibration is transmitted from the rear wheel axle to the rear wheel axle connection end 5, and then along the rear upper fork body 1 to the irregular section 7. The vibration is absorbed by the shock absorption component 8. When the impact causes the irregular section 7 to approach the body, the return spring 84 is compressed and generates a reverse elastic force to offset part of the impact. When the impact disappears, the return spring 84 resets and drives the irregular section 7 back to its initial position, realizing the posture recovery after the vibration. The buffer pads 83 on both sides of the return spring 84 (which are respectively attached to the bottom of the irregular section 7 and the top of the rear upper fork body 1) further weaken the rigid collision. The buffer pads 83 are made of elastic material, which can absorb the high-frequency vibration transmitted by the return spring 84, while avoiding direct friction between the return spring 84 and the rear upper fork body 1, thus protecting the carbon fiber surface.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carbon fiber bicycle integrated irregular-shaped rear upper fork device, comprising a rear upper fork body (1), characterized in that: One end of the rear upper fork body (1) is provided with a seat tube connection end (2), the inner wall of the seat tube connection end (2) is provided with an internal thread (3), the outer side of the seat tube connection end (2) is provided with a reinforcing ring (4), the other end of the rear upper fork body (1) is provided with a rear wheel axle connection end (5), the rear wheel axle connection end (5) is provided with a U-shaped groove (6), the middle position of the rear upper fork body (1) is provided with a special-shaped section (7), the special-shaped section (7) and the rear upper fork body (1) are provided with a shock-absorbing component (8), and the rear upper fork body (1) is provided with a reinforcing rib (9) near the seat tube connection end (2).

2. The integrated irregular-shaped rear upper fork device for carbon fiber bicycles according to claim 1, characterized in that: The rear upper fork body (1) is made of carbon fiber prepreg through in-mold integral molding, and the whole has a symmetrical arc structure.

3. The integrated irregular-shaped rear upper fork device for carbon fiber bicycles according to claim 2, characterized in that: The reinforcing ring (4) is sleeved on the outside of the seat tube connection end (2). The reinforcing ring (4) and the seat tube connection end (2) are provided with through bolt holes. The reinforcing ring (4) and the seat tube connection end (2) are fixed by bolts passing through the bolt holes.

4. The integrated irregular-shaped rear upper fork device for carbon fiber bicycles according to claim 3, characterized in that: The inner wall of the U-shaped slot (6) is fitted with a wear-resistant bushing (10), and the inner surface of the wear-resistant bushing (10) is polished.

5. The integrated irregular-shaped rear upper fork device for carbon fiber bicycles according to claim 4, characterized in that: The shock absorption assembly (8) includes a limiting protrusion (81), a positioning screw (82), a buffer pad (83), and a return spring (84). One end of the positioning screw (82) is fixed to the limiting protrusion (81), the return spring (84) is located on the outside of the positioning screw (82), and the buffer pad (83) is symmetrically arranged on both sides of the return spring (84).

6. The integrated irregular-shaped rear upper fork device for carbon fiber bicycles according to claim 5, characterized in that: The irregular section (7) has a through hole (85), and the rear upper fork body (1) has a threaded hole (86) that matches the positioning screw (82) at the position corresponding to the through hole (85). The positioning screw (82) passes through the through hole (85) and is connected in the threaded hole (86).

7. The integrated irregular-shaped rear upper fork device for carbon fiber bicycles according to claim 6, characterized in that: The limiting protrusion (81) and the positioning screw (82) are integrally formed, the buffer pad (83) is between the bottom of the irregular section (7) and the top of the rear upper fork body (1), and the reset spring (84) is disposed between the irregular section (7) and the rear upper fork body (1).

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