Carbon fiber spoke structure of bicycle and processing method of carbon fiber spoke structure

Abstract

The invention discloses a carbon fiber spoke structure of a bicycle and a processing method thereof.The carbon fiber spoke structure comprises a spoke body with openings in the two ends, trapezoidal yarn is inserted into the opening in the end of the spoke body, and one end of the trapezoidal yarn extends out of the opening and is wound and fixed to the outer side end of the spoke body; 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 body from inside to outside, so that the clamping force of the spoke body and the trapezoidal yarn is increased, then the trapezoidal yarn wraps the spoke body anticlockwise to increase the wrapping force, the installation stability of the spoke body, the thread cap and the cap head is good, the disengagement phenomenon is avoided, and the service life of the spoke body is prolonged. 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] The present invention relates to the technical field of carbon fiber spoke structures, and particularly to a carbon fiber spoke structure for a bicycle and a processing method thereof. Background Art

[0002] One end of a vehicle spoke is connected to a wheel rim in a mating manner, and the other end is connected to a hub in a mating manner. Traditional vehicle spokes are generally made of stainless steel. One end is bent to be hooked to the wheel rim in a mating manner, and the other end is bent to be hooked to the hub in a mating manner. Made of stainless steel, they are heavy in weight, high in cost, and low in production efficiency.

[0003] In view of the above deficiencies, a solution has been proposed: such as CN205273028U, a carbon fiber spoke, including a spoke body. One end of the spoke body is connected to a first fitting capable of being connected to a wheel rim in a mating manner, and the other end is connected to a second fitting capable of being connected to a hub in a mating manner. The spoke body is made of carbon fiber material. The connection between the end of the spoke body and the fitting is by bonding. During use, the hub and the wheel rim can generate a pulling force acting on the fitting, making the fitting easily pulled away from the spoke body, resulting in their separation and short service life. Based on this, we have proposed a carbon fiber spoke structure for a bicycle and a processing method thereof. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a carbon fiber spoke structure for a bicycle and a processing method thereof.

[0005] A carbon fiber spoke structure for a bicycle proposed by the present invention includes a spoke body with openings at both ends. A trapezoidal yarn is inserted into the opening at the end of the spoke body. One end of the trapezoidal yarn extends out of the opening and is wound and fixed on the outer end of the spoke body. A cap head is fixedly sleeved at a position on the outer side of one end of the spoke body close to the trapezoidal yarn, and a threaded cap is fixedly sleeved at a position on the outer side of the other end of the spoke body close to the trapezoidal yarn.

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

[0007] Preferably, the trapezoidal yarn wound and fixed on the outer end of the spoke body is in the shape of a frustum of a cone with a taper.

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

[0009] Preferably, both the threaded cap and the cap head are provided with an installation cavity for fixedly installing the trapezoidal yarn.

[0010] The present invention proposes a processing method for a carbon fiber spoke structure for a bicycle, including the following steps:

[0011] S1: Coating the dry carbon fiber filaments with resin and extruding and curing them into semi-finished round rod-shaped products through a preheated mold. In this process, the excess resin is extruded to improve the yield rate of carbon spokes during the high-temperature hot pressing forming in the forming mold.

[0012] S2: Cut out the carbon fiber blank body with the required length according to actual needs, trim the burrs of the carbon fiber blank body, and then place the carbon fiber blank body and polishing stones together in professional polishing equipment for grinding to manufacture the appearance of the spoke body.

[0013] S3: Clean and dry the surface of the polished spoke body, put special protective sleeves on both ends of the spoke body, then apply special adjustment resin to the unprotected area of the spoke body, and then let it stand and dry, so that the surface of the spoke body is bright and hardened.

[0014] S4: Insert the required metal parts at both ends of the spoke body, then open openings with a depth of 13 mm from the outside to the inside and centered at both ends of the spoke body, apply resin to the openings at both ends of the spoke body, place the long side of the trapezoidal yarn upward and the right-angled side at the opening of the spoke body and fix it. The right-angled side of the trapezoid of the trapezoidal yarn passes through the opening and is flush with the side of the spoke body, and then the trapezoidal yarn is wound counterclockwise from the inside to the outside around the outer end of the spoke body. After the trapezoidal yarn is wrapped, it forms a frustum shape with a tapered port. 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, and then wraps the trapezoidal yarn counterclockwise around the spoke body to increase the wrapping force.

[0015] S5: Put the screw nut and the cap head on the outer ends of both sides of the spoke body through the installation cavity respectively.

[0016] S6: Place the spoke body with the tapered package into a special mold for secondary high-temperature hot pressing forming, so that the clamping force and the wrapping force are combined, thereby enhancing the winding tightness of the tapered yarn at both ends of the spoke body and the spoke body, and improving the tensile rigidity of the spoke body.

[0017] S7: Trim the excess burrs at both ends of the spoke body after the secondary high-temperature hot pressing forming, and then use a professional tensile testing machine to fix the spoke body, the screw nut and the cap head together, and finally obtain the carbon fiber spokes of the bicycle.

[0018] Preferably, in S7, the spoke body, the screw nut and the cap head fixed together by the professional tensile testing machine fully meet the tensile force required for product use.

[0019] Compared with the existing technology, in the present invention, a trapezoidal yarn is clamped 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, and then the trapezoidal yarn is wrapped around the spoke body counterclockwise to increase the wrapping force, so that the installation stability of the spoke body, the screw cap and the cap head is good, and the phenomenon of detachment will not occur. In addition, the cost of processing the spoke body, the screw cap and the cap head into finished products is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic structural diagram of a carbon fiber spoke structure of a bicycle proposed by the present invention;

[0021] Figure 2 FIG. is a schematic installation structure diagram of an opening on a spoke body in a carbon fiber spoke structure of a bicycle proposed by the present invention;

[0022] Figure 3 FIG. is a schematic structural diagram of a cap head in a cut-open state in a carbon fiber spoke structure of a bicycle proposed by the present invention;

[0023] Figure 4 FIG. is a schematic structural diagram of a trapezoidal yarn in a processing method of a carbon fiber spoke structure of a bicycle proposed by the present invention.

[0024] In the figure: 1, spoke body; 2, opening; 3, trapezoidal yarn; 4, cap head; 401, installation cavity; 5, screw cap. DETAILED DESCRIPTION OF THE INVENTION

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

[0026] Embodiment

[0027] Referring to Figures 1-4 , this embodiment proposes a carbon fiber spoke structure of a bicycle, which includes a spoke body 1 with openings 2 at both ends. The depth of the opening 2 at the end of the spoke body 1 is 13 mm. 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 of the opening 2 and is wound and fixed on the outer end of the spoke body 1. The trapezoidal yarn 3 wound and fixed on the outer end of the spoke body 1 is a frustum-shaped structure with a taper. A cap head 4 is fixedly sleeved at a position on the outer side of one end of the spoke body 1 close to the trapezoidal yarn 3, and a screw cap 5 is fixedly sleeved at a position on the outer side of the other end of the spoke body 1 close to the trapezoidal yarn 3. Both the screw cap 5 and the cap head 4 are provided with an installation cavity 401 for fixedly installing the trapezoidal yarn 3;

[0028] Before the trapezoidal yarn 3 is wound, its unfolded dimensions are a bottom length of 18 mm, a top length of 14 mm, and a height of 12 mm. 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 counterclockwise around the spoke body 1 to increase the wrapping force, making the installation of the spoke body 1, the screw nut 5, and the cap head 4 highly stable without detachment. Additionally, the cost of processing the spoke body 1, the screw nut 5, and the cap head 4 into finished products is low.

[0029] This embodiment also proposes a processing method for the carbon fiber spoke structure of a bicycle, including the following steps:

[0030] S1: Pass the dry carbon fiber filaments through resin coating and extrude and cure them into a round rod-shaped semi-finished product through a preheated mold. In this process, the excess resin is extruded to improve the yield rate of carbon spokes during high-temperature hot pressing forming by the forming die.

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

[0032] S3: The polished spoke body 1 is subjected to surface cleaning and drying treatment. Special protective sleeves are put on both ends of the spoke body 1, and then a special adjustment resin is applied to the unprotected area of the spoke body 1, and then left standing for drying, so that the surface of the spoke body 1 is bright and hardened.

[0033] S4: The required metal parts are sleeved on both ends of the spoke body 1. Then, openings 2 with a depth of 13 mm are cut out from the outside to the inside and centered at both ends of the spoke body 1. Resin is coated at the openings 2 at both ends of the spoke body 1. The long side of the trapezoidal yarn 3 is placed upright with the right-angle side at the opening 2 of the spoke body 1 and fixed. 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 wound counterclockwise from the inside to the outside around the outer end of the spoke body 1. After the trapezoidal yarn 3 is wrapped, it forms a frustum shape with a tapered port. 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, and then wraps the trapezoidal yarn 3 counterclockwise around the spoke body 1 to increase the wrapping force.

[0034] S5: The screw nut 5 and the cap head 4 are respectively sleeved on the outer ends of both sides of the spoke body 1 through the installation cavity 401.

[0035] S6: Place the spoke body 1 wrapped with the taper into a special mold for secondary high-temperature hot pressing and forming, so that the clamping force and the wrapping force are combined, thereby enhancing the winding tightness of the tapered yarn at both ends of the spoke body 1 and 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 secondary high-temperature hot pressing and forming, and then use a professional tensile testing machine to fix the spoke body 1, the screw nut 5 and the cap head 4 together. The spoke body 1, the screw nut 5 and the cap head 4 fixed together by the professional tensile testing machine fully meet the tensile force required for product use, and finally obtain the carbon fiber spoke of the bicycle.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes an equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A carbon fiber spoke structure for a bicycle, characterized in that, It includes a spoke body (1) with openings (2) at both ends. 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 of the opening (2) and is wound and fixed on the outer end of the spoke body (1). A cap head (4) is fixedly sleeved at a position on the outer end of the spoke body (1) close to the trapezoidal yarn (3), and a threaded nut (5) is fixedly sleeved at a position on the other outer end of the spoke body (1) close to the trapezoidal yarn (3).

2. The carbon fiber spoke structure of a bicycle according to claim 1, characterized in that, The depth of the opening (2) at the end of the spoke body (1) is 13 mm.

3. A carbon fiber spoke structure for a bicycle according to claim 1, characterized in that, The trapezoidal yarn (3) wound and fixed on the outer end of the spoke body (1) is in the shape of a frustum of a cone with a taper.

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

5. A carbon fiber spoke structure of a bicycle according to claim 1, characterized in that, Both the threaded nut (5) and the cap head (4) are provided with an installation cavity (401) for fixedly installing the trapezoidal yarn (3).

6. A processing method for a carbon fiber spoke structure of a bicycle according to any one of claims 1-5, characterized in that, It includes the following steps: S1: Pass the dry carbon fiber carbon wire through coating resin, and extrude and cure it into a round rod-shaped semi-finished product through a preheated mold. S2: Cut out the carbon fiber blank body with the required length according to actual needs, trim the burrs of the carbon fiber blank body, and then place the carbon fiber blank body and the polishing stone together in a professional polishing equipment for grinding to manufacture the appearance of the spoke body (1). S3: The polished spoke body (1) is subjected to surface cleaning and drying treatment. Special protective sleeves are put on both ends of the spoke body (1), and then special adjustment resin is applied to the unprotected area of the spoke body (1), and then left to dry, so that the surface of the spoke body (1) is bright and hardened. S4: Insert the required metal parts at both ends of the spoke body (1), then open openings (2) with a depth of 13 mm from the outside to the inside and centered at both ends of the spoke body (1). Apply resin at the openings (2) at both ends of the spoke body (1). Place the long side of the trapezoidal yarn (3) facing up and the right-angled side at the opening (2) of the spoke body (1) and fix it. The trapezoidal right-angled 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 wound and 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 of a cone shape with a tapered port. 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), and then wraps the trapezoidal yarn (3) counterclockwise around the spoke body (1) to increase the wrapping force. S5: The threaded nut (5) and the cap head (4) are respectively sleeved on the outer ends of both sides of the spoke body (1) through the installation cavity (401). S6: Place the spoke body (1) with the wrapped taper into a special mold for secondary high-temperature hot pressing to combine the clamping force and the wrapping force, thereby enhancing the winding tightness of the tapered yarn at both ends of the spoke body (1) and the spoke body (1), and improving the tensile rigidity of the spoke body (1). S7: Trim the excess burrs at both ends of the spoke body (1) after secondary high-temperature hot pressing and forming, and then use a professional tensile testing machine to fix the spoke body (1), the screw nut (5) and the cap head (4) together, finally obtaining the carbon fiber spokes of the bicycle.

7. A processing method for a carbon fiber spoke structure of a bicycle according to claim 1, characterized in that, In the above S7, the spoke body (1), the screw nut (5) and the cap head (4) fixed together by the professional tensile testing machine fully meet the tensile force required for product use.

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