A carbon fiber spoke structure

Abstract

This utility model discloses a carbon fiber spoke structure, belonging to the field of spoke technology. It mainly includes a spoke body, a toothed cap, and a cap head. The toothed cap and cap head are respectively fixed to both ends of the spoke body. Both the toothed cap and cap head have coaxially formed through holes for mounting the spoke body. The spoke body is inserted into the through holes and fixed with adhesive. The toothed cap includes an externally threaded section, an extension section, and a wrench arranged sequentially along the axial direction. This application has the effect of enabling fixed-length production of carbon fiber spokes and improving the tensile strength of carbon fiber spokes.

Description

Technical Field

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

[0002] Currently, carbon fiber spokes are made of carbon fiber as the core material and are used as supporting components to connect bicycle hubs and rims. They mainly consist of the spoke body with a carbon fiber core and the toothed caps and caps installed at both ends of the spoke body.

[0003] In the prior art, in order to improve the connection strength between the spoke body and the tooth cap and the cap head, tapered joints are often formed at both ends of the spoke body, and matching tapered grooves are provided inside the tooth cap and the cap head. The tapering effect is used to improve the connection strength between the spoke body and the tooth cap and the cap head.

[0004] However, the aforementioned connection method that improves connection strength through taper relies on external force to tighten the toothed cap and cap head to the spoke body. In actual production, the inventors discovered that due to the small size of the production parts and the difficulty in controlling the precision of manual production, axial relative slippage can occur between the toothed cap and cap head and the spoke body when tightening them during actual production. This results in inconsistent overall lengths of the spoke body, a high defect rate, and, under prolonged high-pressure use, the possibility of axial relative slippage between the toothed cap and cap head and the spoke body, causing changes in the spoke body length and making it difficult to meet the fixed-length requirements of carbon fiber spokes. Therefore, improvements are needed. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a carbon fiber spoke structure that can realize the fixed length production of carbon fiber spokes and improve the tensile strength of carbon fiber spokes.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A carbon fiber spoke structure includes a spoke body, a toothed cap, and a cap head. The toothed cap and cap head are respectively fixed to both ends of the spoke body. Both the toothed cap and cap head have coaxial through holes for mounting the spoke body. The spoke body is inserted into the through holes and fixed by adhesive. The toothed cap includes an external threaded section, an extension section, and a wrench handle arranged sequentially along the axial direction. The external threaded section is used for mounting a nut. The extension section is used to extend the bonding length of the spoke body. The wrench handle is used to form a wrench position.

[0008] By adopting the above technical solution, the traditional unstable connection method of using taper or step is abandoned, and an adhesive bonding method is adopted instead. The external thread section and the wrench are necessary structures for the thread cap. This application can increase the bonding length and adhesive area by setting an extended section combined with the setting of through holes, so as to meet the tensile strength of carbon fiber spokes to thread caps and cap heads, while controlling the fixed length of carbon fiber spokes.

[0009] In one possible implementation, the inner wall of the through hole is provided with a positive thread groove and a negative thread groove, the positive thread groove and the negative thread groove are respectively located at both ends of the through hole, and the positive thread groove and the negative thread groove each account for one-third to two-fifths of the total length of the through hole.

[0010] By adopting the above technical solution, a positive thread groove and a negative thread groove are provided inside the through hole. The functions are as follows: First, by utilizing the concave effect of the positive thread groove and the negative thread groove, the surface roughness of the inner wall of the through hole is increased, which can increase the adhesive area between the inside of the through hole and the adhesive layer, and improve the bonding strength between the spoke body and the tooth cap and the cap head; Second, by utilizing the simultaneous existence of the positive thread groove and the negative thread groove, the bonding effect between the spoke body and the tooth cap is prevented from rotating, further improving the connection stability between the spoke body and the tooth cap.

[0011] In one possible implementation, the extended section includes a transition section and a riveting section, the transition section being connected to the threaded section, the riveting section being connected to the wrench, and the riveting section using a riveting device to rivet the threaded cap to the spoke body.

[0012] By adopting the above technical solution, the extended section is further physically compressed using riveting. The reinforcement advantage of riveting can be used to further lock it in place and improve the tensile strength between the spoke body and the tooth cap.

[0013] In one possible implementation, an injection hole is provided at the middle of the extended section, and the injection hole is connected to the through hole.

[0014] By adopting the above technical solution, the glue injection hole is set up so that the glue can be injected into the through hole through the glue injection hole. By rotating the thread cap, the glue can be gradually and evenly distributed into the through hole along the positive thread groove and the negative thread spiral groove. Then the spoke body is inserted into the through hole for curing.

[0015] In one possible implementation, the total length of the dental cap can be set between 10 mm and 40 mm.

[0016] By adopting the above technical solution, the total length of the dental cap can be appropriately adjusted according to the choice of adhesive. This is mainly achieved by extending the reinforcement length, increasing the contact area, and fixing it by adhesive bonding.

[0017] In one possible implementation, the tooth cap has a closed port near the end of the external thread segment.

[0018] By adopting the above technical solution, the setting of the closed port has two advantages: first, it helps to coat the glue inside the through hole; second, it helps to position and install the spoke body.

[0019] Compared with existing technologies, the advantages of this utility model are:

[0020] 1. Abandoning the traditional unstable connection methods such as tapers or steps, we adopt an adhesive bonding method. By setting an extended section and a through hole, we can increase the bonding length and bonding area. By setting positive thread grooves and negative thread helical grooves, we can improve the inner surface roughness and increase the bonding strength. By setting a riveting section, we can further improve the tightness through riveting. Overall, we can meet the tensile strength of carbon fiber spokes, tooth caps and cap heads, while controlling the fixed length of carbon fiber spokes. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the carbon fiber spoke structure of Embodiment 1 of this application;

[0022] Figure 2 This is a cross-sectional view of the tooth cap with a carbon fiber spoke structure according to Embodiment 1 of this application;

[0023] Figure 3 This is a cross-sectional view of the tooth cap with a carbon fiber spoke structure according to Embodiment 2 of this application;

[0024] Figure 4 This is a cross-sectional view of the tooth cap with a carbon fiber spoke structure according to Embodiment 3 of this application.

[0025] Explanation of the labels in the diagram:

[0026] 1. Spoke body; 2. Thread cap; 21. External thread section; 22. Extension section; 221. Transition section; 222. Riveting section; 23. Wrench; 3. Cap head; 4. Through hole; 5. Positive thread groove; 6. Reverse thread groove; 7. Glue injection hole; 8. Metal block; 9. Inner groove. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0028] Example 1:

[0029] This application discloses a carbon fiber spoke structure, referring to... Figures 1-2The device includes a spoke body 1, a toothed cap 2, and a cap head 3. The toothed cap 2 and cap head 3 are fixed to both ends of the spoke body 1. Both the toothed cap 2 and cap head 3 have through holes 4 coaxially formed for mounting the spoke body 1. The spoke body 1 is inserted into the through holes 4 and fixed with adhesive. The toothed cap 2 includes an external threaded section 21, an extension section 22, and a wrench 23 arranged sequentially along the axial direction. The total length of the toothed cap can be set between 10 mm and 40 mm. The toothed cap 2 is cylindrical in shape, with a through hole 4 in the middle. An external thread is machined in one section to form the external threaded section 21. The extension section 22 mainly serves to lengthen the spoke. The wrench 23 is formed by machining a wrench position on the outer wall of one end of the toothed cap 2. Specifically, in this embodiment, the spoke body is 1.65 mm long, the total length of the toothed cap is 20 mm, and the threaded section is 10 mm.

[0030] Traditional methods using tapers or steps still tend to be unstable in actual production and use. The technical solution of this application will abandon the traditional fixing method and adopt a new fixing method, namely adhesive fixing. The adhesive can be epoxy resin. The external thread section 21 and the wrench 23 are necessary structures of the thread cap 2. By setting the extended section 22 in combination with the through hole 4, this application can increase the bonding length and the adhesive area, meet the tensile strength of the carbon fiber spokes to the thread cap 2 and the cap head 3, and control the fixed length of the carbon fiber spokes.

[0031] Furthermore, a positive thread groove 5 and a negative thread groove 6 are machined on the inner wall of the through hole 4. The positive thread groove 5 and the negative thread groove 6 are respectively located at both ends of the through hole 4. The positive thread groove 5 and the negative thread groove 6 each account for one-third to two-fifths of the total length of the through hole 4. In this embodiment, the positive thread groove 5, the negative thread groove 6 and the blank section each account for one-third.

[0032] The advantages of using both positive thread groove 5 and negative thread groove 6 are as follows: First, by utilizing the concave effect of positive thread groove 5 and negative thread groove 6, the surface roughness of the inner wall of the through hole 4 is increased, which can increase the adhesive area between the inside of the through hole 4 and the adhesive layer, thereby improving the bonding strength between the spoke body 1 and the toothed cap 2 and the cap head 3. Second, by utilizing the simultaneous existence of positive thread groove 5 and negative thread groove 6, the bonding effect between the spoke body 1 and the toothed cap 2 is prevented from rotating, further improving the connection stability between the spoke body 1 and the toothed cap 2.

[0033] Furthermore, the extended section 22 includes a transition section 221 and a riveting section 222. The transition section 221 is connected to the threaded section, and the riveting section 222 is connected to the wrench 23. The riveting section 222 uses a riveting device to rivet the threaded cap 2 to the spoke body 1. Riveting further applies physical pressure to the extended section 22, and by utilizing the reinforcing advantages of riveting, it can further secure the connection and increase the tensile strength between the spoke body 1 and the threaded cap 2. The riveting depth of the riveting section 222 is 5-10 microns.

[0034] Specifically, in this embodiment, the spoke body is processed with an end diameter of 1.65 mm, the total length of the tooth cap is 20 mm, the length of the external thread section is 10 mm, the transition section 221 and the riveting section 222 are 2 mm and 6 mm respectively, and the length of the wrench is 2 mm.

[0035] The implementation principle of Example 1 is as follows: After processing, the end of the spoke body 1 is coated with adhesive, inserted into the toothed cap 2, and rotated back and forth to ensure uniformity. The end alignment of the spoke body 1, toothed cap 2, and cap head 3 is then achieved. The spoke body 1 is placed in a riveting device for riveting, followed by heating and curing. The riveting method mainly adopts conventional tube shrinking riveting technology, which involves setting at least eight clamping sliders on the periphery of the riveting section. These sliders are controlled by hydraulic drive to perform riveting action on the riveting section 222 from the periphery, followed by heating and curing.

[0036] Example 2:

[0037] Reference Figure 3 The difference from Embodiment 1 is that an injection hole 7 is provided on the outer wall of the middle part of the extended section 22, and the injection hole 7 is connected to the through hole 4. With the injection hole 7, adhesive can be injected into the through hole 4 through the injection hole 7. By rotating the thread cap 2, the adhesive can be gradually and evenly distributed into the through hole 4 along the positive thread groove 5 and the negative thread groove 6. Then, the spoke body 1 is inserted into the through hole 4 for curing, facilitating convenient and uniform adhesive application. Furthermore, a metal block 8 can be filled into the injection hole 7 for reinforcement.

[0038] The implementation principle of Example 2 is as follows: For the device with glue injection hole 7, glue is injected through glue injection hole 7. Rotate tooth cap 2 to spread the glue to both sides and evenly attach it to the inner wall of through hole 4. Insert spoke body 1 into through hole 4 and put it into riveting equipment for riveting operation.

[0039] Example 3:

[0040] Reference Figure 4 The difference from Embodiment 1 is that the tooth cap 2 has a closed port 10 fixed at one end near the external thread section 21. The closed port 10 is provided to facilitate the application of adhesive in the through hole 4 and to facilitate the positioning and installation of the spoke body 1.

[0041] The implementation principle of Example 3 is as follows: pour glue into the through hole, insert the spoke into the through hole, squeeze the glue in the cavity, and the glue will overflow from the gap, thereby achieving the coating effect of glue. The excess glue can be wiped away.

[0042] The above are merely preferred embodiments of this utility model; however, the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and its improved concept, should be included within the scope of protection of this utility model.

Claims

1. A carbon fiber spoke structure, comprising a spoke body (1), a tooth cap (2), and a cap head (3), wherein the tooth cap (2) and the cap head (3) are respectively fixed to both ends of the spoke body (1), characterized in that, Both the tooth cap (2) and the cap head (3) are coaxially provided with through holes (4) for mounting the spoke body (1). The spoke body (1) is inserted into the through hole (4) and fixed by adhesive. The tooth cap (2) includes an external thread section (21), an extension section (22) and a wrench (23) arranged sequentially along the axial direction. The external thread section (21) is used for the installation and engagement of the nut. The extension section (22) is used to extend the bonding length of the spoke body (1). The wrench is used to form the wrench position.

2. The carbon fiber spoke structure according to claim 1, characterized in that, The inner wall of the through hole (4) is provided with a positive thread groove (5) and a negative thread groove (6). The positive thread groove (5) and the negative thread groove (6) are respectively located at both ends of the through hole (4). The positive thread groove (5) and the negative thread groove (6) each account for one-third to two-fifths of the total length of the through hole (4).

3. The carbon fiber spoke structure according to claim 1, characterized in that, The extended section (22) includes a transition section (221) and a riveting section (222). The transition section (221) is connected to the external thread section (21), and the riveting section (222) is connected to the wrench (23). The riveting section (222) uses a riveting device to rivet the thread cap (2) to the spoke body (1).

4. The carbon fiber spoke structure according to claim 2, characterized in that, An injection hole (7) is provided in the middle of the extended section (22), and the injection hole (7) is connected to the through hole (4).

5. A carbon fiber spoke structure according to claim 1, characterized in that, The total length of the dental cap (2) can be set between 10 mm and 40 mm.

6. The carbon fiber spoke structure according to claim 1, characterized in that, The tooth cap (2) has a closed port (10) at one end near the external thread section (21).

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