Carbon fiber spoke structure of bicycle

Abstract

The carbon fiber spoke structure of the bicycle comprises a spoke body with openings in the two ends, trapezoidal yarn is inserted into the openings in the ends of the spoke body, one end of the trapezoidal yarn extends out of the openings and is wound and fixed to the end of the outer side of the spoke body, and the other end of the trapezoidal yarn extends out of the openings. A cap head is fixedly sleeved at one end of the outer side of the spoke main body close to the trapezoidal yarn, and a thread cap is fixedly sleeved at the other end of the outer side of the spoke main body close to the trapezoidal yarn. The trapezoidal yarn is clamped at the opening of the spoke main body from inside to outside so as to increase the clamping force of the spoke main body and the trapezoidal yarn, and then the trapezoidal yarn is wrapped on the spoke main body anticlockwise so as to increase the wrapping force, so that the installation stability of the spoke main body, the thread cap and the cap head is good, and the phenomenon of separation is avoided; in addition, the cost of processing the spoke main body, the thread cap and the cap head into a finished product is low.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber spoke structure technology, and in particular to a carbon fiber spoke structure for a bicycle. Background Technology

[0002] Bicycle spokes are attached to the rim at one end and to the hub at the other. Traditional bicycle spokes are generally made of stainless steel, with one end bent to hook onto the rim and the other end bent to hook onto the hub. Using stainless steel results in heavy weight, high cost, and low production efficiency.

[0003] To address the aforementioned shortcomings, some solutions have been proposed, such as CN205273028U, which describes a carbon fiber spoke. This spoke includes a body, with one end connected to a first component that mates with the rim, and the other end connected to a second component that mates with the hub. The body is made of carbon fiber. The connection between the spoke body and the component is achieved through bonding. During use, the hub and rim exert tensile forces on the component, making it easy for the component to be pulled away from the spoke body, leading to separation and a short lifespan. Based on this, we propose a carbon fiber spoke structure for bicycles. Utility Model Content

[0004] Based on the technical problems existing in the background art, this utility model proposes a carbon fiber spoke structure for bicycles.

[0005] The present invention discloses a carbon fiber spoke structure for bicycles, comprising a spoke body with openings at both ends. A trapezoidal yarn is inserted into the opening at one end of the spoke body, one end of the trapezoidal yarn extends out of the opening and is wrapped and fixed to the outer end of the spoke body. A cap is fixedly fitted at one outer end of the spoke body near the trapezoidal yarn, and a threaded cap is fixedly fitted at the other outer end of the spoke body near the trapezoidal yarn.

[0006] Preferably, the opening depth at the end of the spoke body is 13 mm.

[0007] Preferably, the trapezoidal yarn wound and fixed to the outer end of the spoke body is a truncated cone structure with a taper.

[0008] Preferably, the unfolded dimensions of the trapezoidal yarn before winding are 18mm at the bottom, 14mm at the top, and 12mm in height.

[0009] Preferably, both the threaded cap and the cap head have a pre-reserved mounting cavity for fixing the trapezoidal yarn.

[0010] This utility model also proposes a method for processing carbon fiber spokes for bicycles, including the following steps:

[0011] S1: Dry carbon fiber filaments are coated with resin and then extruded and cured into a round bar semi-finished product through a preheated mold. This process pulls out excess resin and improves the yield of carbon spokes when they are hot-pressed by a molding die.

[0012] S2: Cut the carbon fiber blank to the required length according to actual needs, trim the rough edges of the carbon fiber blank, and then place the carbon fiber blank together with the polishing stone in a professional polishing equipment for grinding to create the appearance of the spoke body.

[0013] S3: After polishing, the spoke body undergoes surface cleaning and drying. Special protective sleeves are then placed on both ends of the spoke body. Special adjusting resin is then applied to the unprotected areas of the spoke body, and the body is left to dry, resulting in a glossy and hardened surface.

[0014] S4: Insert the required metal parts into both ends of the spoke body, and then make a 13mm deep opening from the outside to the center at both ends of the spoke body. Apply resin to the openings at both ends of the spoke body. Place the trapezoidal yarn with its long side facing up and its right angle side at the opening of the spoke body and fix it. The trapezoidal right angle side of the trapezoidal yarn passes through the opening and is flush with the side of the spoke body. Then, the trapezoidal yarn is wrapped counterclockwise from the inside to the outside at the outer end of the spoke body. After the trapezoidal yarn is wrapped, it forms a frustum shape with a tapered end. This operation first clamps the trapezoidal yarn from the inside to the outside at the opening of the spoke body to increase the clamping force between the spoke body and the trapezoidal yarn. Then, the trapezoidal yarn is wrapped counterclockwise around the spoke body to increase the wrapping force.

[0015] S5: Fit the threaded cap and cap head onto the outer ends of the spoke body through the mounting cavity;

[0016] S6: The tapered spoke body is placed in a special mold for secondary high-temperature hot pressing, which combines clamping force and wrapping force, thereby enhancing the tightness of the tapered yarn at both ends of the spoke body and improving the tensile rigidity of the spoke body.

[0017] S7: After the second high-temperature hot pressing molding, the excess burrs at both ends of the spoke body are trimmed, and then the spoke body, screw cap and cap head are fixed together using a professional tensile testing machine to finally obtain the carbon fiber spoke of the bicycle.

[0018] Preferably, in S7, the spoke body, threaded cap, and cap head, which are fixed together by a professional tensile testing machine, fully meet the tensile requirements for product use.

[0019] Compared with existing technologies, this utility model clamps the trapezoidal yarn from the inside to the outside at the opening of the spoke body to increase the clamping force between the spoke body and the trapezoidal yarn. Then, the trapezoidal yarn is wrapped around the spoke body counterclockwise to increase the wrapping force, which makes the installation of the spoke body, the screw cap and the cap head more stable and prevents them from falling off. In addition, the cost of processing the spoke body, the screw cap and the cap head into finished products is low. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a carbon fiber spoke structure for a bicycle according to the present invention.

[0021] Figure 2 This is a schematic diagram of the installation structure of the opening in the carbon fiber spoke structure of a bicycle according to the present invention on the spoke body;

[0022] Figure 3 This is a schematic diagram of the visor of a bicycle in a cross-sectional state, as proposed in this utility model.

[0023] Figure 4 This is a schematic diagram of the trapezoidal yarn in the carbon fiber spoke structure of a bicycle according to the present invention.

[0024] In the diagram: 1. Spoke body; 2. Opening; 3. Trapezoidal yarn; 4. Cap; 401. Mounting cavity; 5. Threaded cap. Detailed Implementation

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] Example

[0027] Reference Figure 1-4 This embodiment proposes a carbon fiber spoke structure for a bicycle, including a spoke body 1 with openings 2 at both ends. The opening 2 at the end of the spoke body 1 has a depth of 13mm. A trapezoidal yarn 3 is inserted into the opening 2 at the end of the spoke body 1. One end of the trapezoidal yarn 3 extends out from the opening 2 and is wound and fixed to the outer end of the spoke body 1. The trapezoidal yarn 3 wound and fixed to the outer end of the spoke body 1 is a truncated cone structure with a taper. A cap 4 is fixedly fitted at one end of the outer side of the spoke body 1 near the trapezoidal yarn 3. A threaded cap 5 is fixedly fitted at the other end of the outer side of the spoke body 1 near the trapezoidal yarn 3. Both the threaded cap 5 and the cap 4 have a reserved mounting cavity 401 for fixed installation with the trapezoidal yarn 3.

[0028] Before being wrapped, the trapezoidal yarn 3 has an unfolded size of 18mm at the bottom, 14mm at the top, and 12mm in height. In this embodiment, the trapezoidal yarn is clamped from the inside to the outside at the opening 2 of the spoke body 1 to increase the clamping force between the spoke body 1 and the trapezoidal yarn 3. Then, the trapezoidal yarn 3 is wrapped around the spoke body 1 counterclockwise to increase the wrapping force, so that the spoke body 1, the screw cap 5, and the cap head 4 are well installed and will not detach. In addition, the cost of processing the spoke body 1, the screw cap 5, and the cap head 4 into finished products is low.

[0029] The specific processing procedure in this embodiment includes the following steps:

[0030] S1: Dry carbon fiber filaments are coated with resin and then extruded and cured into a round bar semi-finished product through a preheated mold. This process pulls out excess resin and improves the yield of carbon spokes when they are hot-pressed by a molding die.

[0031] S2: Cut the carbon fiber blank body to the required length according to actual needs, trim the rough edges of the carbon fiber blank body, and then place the carbon fiber blank body together with the polishing stone in a professional polishing equipment for grinding to create the appearance of the spoke body 1.

[0032] S3: After polishing, the spoke body 1 undergoes surface cleaning and drying. Special protective sleeves are put on both ends of the spoke body 1. Then, special adjusting resin is applied to the unprotected areas of the spoke body 1. After that, it is left to dry, so that the surface of the spoke body 1 becomes glossy and hardened.

[0033] S4: Insert the required metal parts into both ends of the spoke body 1, and then make a 13mm deep opening 2 from the outside to the center at both ends of the spoke body 1. Apply resin to the opening 2 at both ends of the spoke body 1. Place the trapezoidal yarn 3 with its long side facing up and its right angle side at the opening 2 of the spoke body 1 and fix it. The trapezoidal right angle side of the trapezoidal yarn 3 passes through the opening 2 and is flush with the side of the spoke body 1. Then, the trapezoidal yarn 3 is wrapped counterclockwise from the inside to the outside at the outer end of the spoke body 1. After the trapezoidal yarn 3 is wrapped, it forms a frustum shape with a tapered end. This operation first clamps the trapezoidal yarn 3 from the inside to the outside at the opening 2 of the spoke body 1 to increase the clamping force between the spoke body 1 and the trapezoidal yarn 3. Then, the trapezoidal yarn 3 is wrapped counterclockwise on the spoke body 1 to increase the wrapping force.

[0034] S5: The threaded cap 5 and the cap head 4 are respectively fitted onto the outer ends of the spoke body 1 through the mounting cavity 401;

[0035] S6: The tapered spoke body 1 is placed in a special mold for secondary high-temperature hot pressing, which combines the clamping force and the wrapping force, thereby enhancing the tight wrapping of the tapered yarn at both ends of the spoke body 1 with the spoke body 1 and improving the tensile rigidity of the spoke body 1.

[0036] S7: Trim the excess burrs at both ends of the spoke body 1 after the secondary high-temperature hot pressing molding. Then, use a professional tensile testing machine to fix the spoke body 1, the screw cap 5, and the cap head 4 together. The spoke body 1, the screw cap 5, and the cap head 4 fixed together by the professional tensile testing machine fully meet the tensile strength required for product use, and finally obtain the carbon fiber spokes of the bicycle.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A carbon fiber spoke structure of a bicycle, characterized by, The spoke body (1) with openings (2) at both ends, the trapezoidal yarn (3) is inserted into the opening (2) at the end of the spoke body (1), one end of the trapezoidal yarn (3) extends out of the opening (2) and is wound and fixed on the outer end of the spoke body (1), the cap (4) is fixedly sleeved on the position close to the trapezoidal yarn (3) at one end of the outer side of the spoke body (1), and the threaded cap (5) is fixedly sleeved on the position close to the trapezoidal yarn (3) at the other end of the outer side of the spoke body (1).

2. A carbon fiber spoke structure for a bicycle as defined in claim 1, wherein The depth of the opening (2) at the end of the spoke body (1) is 13mm.

3. The carbon fiber spoke structure of a bicycle according to claim 1, wherein The trapezoidal yarn (3) wound and fixed on the outer end of the spoke body (1) is a circular truncated cone structure with taper.

4. The carbon fiber spoke structure of a bicycle according to claim 1, wherein The unfolded size of the trapezoidal yarn (3) before winding is 18mm in length at the bottom, 14mm in length at the top and 12mm in height.

5. The carbon fiber spoke structure of a bicycle according to claim 1, wherein The threaded cap (5) and the cap (4) are both provided with an installation cavity (401) for fixing and installing the trapezoidal yarn (3).

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