Carbon fiber spoke structure

Abstract

The invention discloses a carbon fiber spoke structure, and relates to the technical field of spokes, the carbon fiber spoke structure mainly comprises a spoke body, a tooth cap and a cap head, the tooth cap and the cap head are fixed to the two ends of the spoke body respectively, the tooth cap and the cap head are coaxially provided with through holes for installation of the spoke body, and the spoke body is inserted into the through holes and fixed through glue. The tooth cap comprises an external thread section, a lengthening section and a wrench section which are sequentially arranged in the axis direction. The device has the advantages that fixed-length production of the carbon fiber spokes is achieved, and the tensile strength effect of the carbon fiber spokes is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of spokes, and in particular to a carbon fiber spoke structure. Background Art

[0002] At present, carbon fiber spokes are made of carbon fiber as the core material and are used to connect the bicycle hub and the supporting component of the rim. They mainly include a spoke body with a carbon fiber inner core and a thread cap and a cap head 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 threaded cap and the cap head, a tapered fixed joint is often formed at both ends of the spoke body, and a matching tapered groove is provided inside the threaded cap and the cap head. The taper effect is utilized to improve the connection strength between the spoke body and the threaded cap and the cap head.

[0004] However, the above-mentioned connection method of improving the connection strength by taper is to tighten the cap and the cap head to the spoke body through external force. The inventor found in the actual production process that due to the small production objects and the difficulty in controlling the precision of manual production, in actual production, when the cap and the cap head are tightened to the spoke body, due to the difficulty in controlling the taper precision, there will be axial relative slippage between the cap and the cap head and the spoke body, resulting in the overall length of the spoke body being inconsistent and the defective rate being high. In addition, under long-term high-pressure use environment, there is also the possibility of axial relative slippage between the cap and the cap head and the spoke body, resulting in changes in the length of the spoke body, which is difficult to meet the fixed length requirements of carbon fiber spokes. Therefore, improvement is needed. Summary of the Invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a carbon fiber spoke structure, which can realize the fixed-length production of carbon fiber spokes and improve the tensile strength of the carbon fiber spokes.

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

[0007] A carbon fiber spoke structure includes a spoke body, a thread cap and a cap head, the thread cap and the cap head are respectively fixed to the two ends of the spoke body, the thread cap and the cap head are coaxially provided with a through hole for installing the spoke body, the spoke body is inserted into the through hole and fixed by gluing, the thread cap includes an external thread segment, an extension segment and a wrench means arranged in sequence along the axial direction, the external thread segment is used for installing and cooperating with the nut, the extension segment is used to extend the bonding length of the spoke body, and the wrench means is used to form a wrench position.

[0008] By adopting the above technical solution, the traditional unstable connection methods such as tapers or steps are abandoned, and the adhesive fixing method is adopted. The external thread segment and the wrench means are necessary structures of the thread cap. The present application increases the bonding length and bonding area by setting an extension segment combined with the through hole, thereby meeting the tensile strength between the carbon fiber spokes, the thread cap and the cap head, and controlling the fixed length of the carbon fiber spokes at the same time.

[0009] In one possible implementation, the inner wall of the through hole is provided with a positive thread groove and a negative thread groove, and the positive thread groove and the negative thread groove are respectively arranged 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, and their functions are, firstly, to utilize the concave effect of the positive thread groove and the negative thread groove to improve the surface roughness of the inner wall of the through hole, which can increase the bonding area between the inside of the through hole and the adhesive layer, and improve the bonding strength between the spoke body and the cap and the cap head; secondly, to utilize the simultaneous existence of the positive thread groove and the negative thread groove to play an anti-rotation effect between the spoke body and the cap after bonding, and further improve the connection stability between the spoke body and the cap.

[0011] In a possible implementation, the extension section includes a transition section and a riveting section, the transition section is connected to the thread section, the riveting section is connected to the wrench means, and the riveting section uses a riveting device to rivet the thread cap to the spoke body.

[0012] By adopting the above technical solution, the extended section is further physically pressurized by riveting, and the reinforcement advantage of riveting is utilized to further lock and improve the tensile strength between the spoke body and the tooth cap.

[0013] In a possible implementation, a glue injection hole is provided in the middle of the extended section, and the glue injection hole is communicated with the through hole.

[0014] By adopting the above technical solution and setting the glue injection hole, the glue can be injected into the through hole through the glue injection hole. By rotating the tooth cap, the glue can be gradually distributed to the inside of the through hole along the positive thread groove and the negative thread spiral groove, and then the spoke body can be inserted into the through hole for curing.

[0015] In a possible implementation, the total length of the tooth cap can be set to 10 mm-40 mm.

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

[0017] In a possible implementation, a closed port is provided at one end of the thread cap close to the external thread segment.

[0018] By adopting the above technical solution, the setting of the closed port is helpful for coating the glue in the through hole and is helpful for positioning and installing the spoke body.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1. Abandon the traditional unstable connection methods such as tapers or steps, and adopt the adhesive fixing method. By setting the extension section and the through-hole setting, the bonding length and bonding area can be increased. By setting the positive thread groove and the negative thread spiral groove, the inner surface roughness is improved and the bonding strength is improved. By setting the riveting section, the compression is further improved by riveting. Overall, the tensile strength between the carbon fiber spokes, the thread caps and the cap heads is met, while the fixed length of the carbon fiber spokes is controlled. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 A cross-sectional view of a spoke cap of a carbon fiber spoke structure according to Example 1 of the present application;

[0023] Figure 3 A cross-sectional view of a spoke cap of a carbon fiber spoke structure according to Example 2 of the present application;

[0024] Figure 4 This is a cross-sectional view of the tooth cap of the carbon fiber spoke structure of Example 3 of the present application.

[0025] Description of the numbers in the figure:

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

[0027] The following is combined with Figure 1-4 This application is described in further detail.

[0028] Example 1:

[0029] The present application discloses a carbon fiber spoke structure, referring to Figure 1-Figure 2, including a spoke body 1, a thread cap 2 and a cap head 3. The thread cap 2 and the cap head 3 are respectively fixed to the two ends of the spoke body 1. The thread cap 2 and the cap head 3 are coaxially provided with a through hole 4 for the installation of the spoke body 1. The spoke body 1 is inserted into the through hole 4 and fixed by gluing. The thread cap 2 includes an external thread segment 21, an extension segment 22 and a wrench means 23 arranged in sequence along the axial direction. The total length of the thread cap can be set at 10mm-40mm. The thread cap 2 is arranged as a whole in a cylindrical shape, with a through hole 4 opened in the middle. An external thread is processed in one section to form the external thread segment 21. The extension segment 22 mainly has a lengthening function. The wrench means 23 is a wrench position processed with the outer wall of one end of the thread cap 2. Specifically, this embodiment processes a spoke body of 1.65 mm, the thread cap has a total length of 20 mm, and the thread segment is 10 mm.

[0030] The traditional methods of using tapers or steps still show an unstable trend 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 glue can be epoxy resin glue. The external thread segment 21 and the lever means 23 are necessary structures of the tooth cap 2. This application increases the bonding length and bonding area by setting an extension section 22 in combination with the setting of the through hole 4, thereby meeting the tensile strength of the carbon fiber spokes, the tooth cap 2 and the cap head 3, and controlling the fixed length of the carbon fiber spokes at the same time.

[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 arranged 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 the positive thread groove 5 and the negative thread groove 6 are that, first, the concave effect of the positive thread groove 5 and the negative thread groove 6 is utilized to improve the surface roughness of the inner wall of the through hole 4, which can increase the bonding area between the inside of the through hole 4 and the adhesive layer, and improve the bonding strength between the spoke body 1 and the cap 2 and the cap head 3; second, the simultaneous existence of the positive thread groove 5 and the negative thread groove 6 has an anti-rotation effect between the spoke body 1 and the cap 2 after bonding, further improving the connection stability between the spoke body 1 and the cap 2.

[0033] Furthermore, the extension section 22 includes a transition section 221 and a rivet section 222. The transition section 221 is connected to the threaded section, and the rivet section 222 is connected to the lever 23. The rivet section 222 uses a rivet device to rivet the thread cap 2 to the spoke body 1. Riveting further physically compresses the extension section 22, leveraging the reinforcement provided by rivet pressure to further secure the spoke body 1 and thread cap 2, increasing the tensile strength between the spoke body 1 and thread cap 2. The rivet depth of the rivet section 222 is 5-10 mm.

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

[0035] The working principle of Example 1 is as follows: After processing, the spoke body 1 is coated with adhesive, the spoke cap 2 is inserted and rotated back and forth to ensure uniformity. The spoke body 1 is aligned with the spoke cap 2 and the end of the cap head 3. The spoke body 1 is then placed in the riveting equipment for riveting, and then placed in a heated curing process. The riveting process mainly adopts conventional shrink tube riveting technology. At least eight clamping sliders are installed on the periphery of the riveting section, which are controlled by hydraulic drive. The riveting section 222 is then riveted from the periphery and placed in a heated curing process.

[0036] Example 2:

[0037] Reference Figure 3 The difference from Example 1 is that a glue injection hole 7 is provided on the outer wall of the extended section 22 in the middle, communicating with the through hole 4. The provision of the glue injection hole 7 allows glue to be injected into the through hole 4 through the glue injection hole 7. By rotating the thread cap 2, the glue is gradually and evenly distributed throughout the through hole 4 along the positive and negative thread grooves 5 and 6. The spoke body 1 is then inserted into the through hole 4 for curing, facilitating convenient and uniform glue application. Furthermore, the glue injection hole 7 can be filled with a metal block 8 for reinforcement.

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

[0039] Example 3:

[0040] Reference Figure 4 The difference from Example 1 is that a closed end 10 is fixed to one end of the thread cap 2 near the outer thread segment 21. The setting of the closed end 10 is to facilitate the glue coating 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: 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 to achieve the coating effect of the glue, and the excess glue can be wiped off.

[0042] The above are only preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A carbon fiber spoke structure, comprising a spoke body (1), a thread cap (2) and a cap head (3), wherein the thread cap (2) and the cap head (3) are respectively fixed to the two ends of the spoke body (1), characterized in that: The thread cap (2) and the cap head (3) are both coaxially provided with a through hole (4) for mounting the spoke body (1); the spoke body (1) is inserted into the through hole (4) and fixed by gluing; the thread cap (2) comprises an external thread segment (21), an extension segment (22) and a wrench means (23) sequentially arranged along the axial direction; the external thread segment (21) is used for mounting and matching the nut; the extension segment (22) is used for extending the bonding length of the spoke body (1); and the wrench means is used for forming a wrench position.

2. A 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 arranged at two ends of the through hole (4), and 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) comprises a transition section (221) and a riveting section (222), wherein the transition section (221) is connected to the external thread section (21), and the riveting section (222) is connected to the lever means (23). The riveting section (222) uses a riveting device to rivet the thread cap (2) and the spoke body (1) together.

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

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

6. The carbon fiber spoke structure according to claim 1, characterized in that: The thread cap (2) is provided with a closed port (10) at one end close to the external thread segment (21).

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