Carbon fiber spoke capable of preventing relative displacement of metal piece and carbon fiber mandrel

Abstract

The utility model provides a carbon fiber spoke for preventing relative displacement of metal pieces and a carbon fiber mandrel, which comprises a spoke, a spoke main body and the metal pieces arranged at two ends of the spoke main body, the section of each metal piece is of a stepped structure, the size of each metal piece is gradually reduced along the extending direction of two ends of the spoke main body, and each metal piece is in a non-revolving body shape; the cap head and the tooth cap are oppositely arranged at the two ends of the spoke body, installation parts matched with the metal pieces are arranged in the cap head and the tooth cap, and the metal pieces are wedged into the installation parts so that the cap head and the tooth cap can be fixed to the two ends of the spoke. The metal piece is matched with the mounting part to form wedged fixation, and the non-revolving body shape can effectively eliminate the relative rotational degree of freedom between the spokes and the cap head / tooth cap, so that the spokes are prevented from twisting when being stressed. The self-locking effect during installation is enhanced through the size decreasing design of the step-shaped structure, stable connection is ensured, and the problems that a traditional conical rotary body structure is prone to loosening and limiting fails are solved.

Description

Technical Field

[0001] This utility model relates to a carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel. Background Technology

[0002] Carbon fiber spokes are spokes used in bicycle wheelsets, primarily made of carbon fiber. One existing method of spoke installation involves designing one end of the carbon fiber spoke in a tapered shape, with corresponding tapered holes on the crown and hub. During installation, the tapered end of the spoke is inserted into the tapered holes on the crown and hub, and then the crown and hub are fixed to the rim and hub. The tapered fit creates compression, tightly connecting the spoke to the rim. This method utilizes the geometric properties of the tapered shape; when the spoke is under tension, the tapered fit becomes even tighter, achieving self-locking and fixation.

[0003] This conical hole can easily lead to the failure of the spoke's limiting mechanism, and the conical rotating structure poses a risk of relative rotation between the metal part and the cap and tooth cap. Therefore, this invention provides a carbon fiber spoke that prevents relative displacement between the metal part and the carbon fiber mandrel. Utility Model Content

[0004] This invention provides a carbon fiber spoke for preventing relative displacement between the metal part and the carbon fiber mandrel, which can effectively solve the above-mentioned problems.

[0005] This utility model is implemented as follows:

[0006] A carbon fiber spoke for preventing relative displacement between a metal component and a carbon fiber mandrel, comprising:

[0007] A spoke includes a spoke body and metal parts disposed at both ends of the spoke body. The cross-section of the metal parts is a stepped structure, and the dimensions of the metal parts decrease along the extension direction of both ends of the spoke body. The metal parts are non-rotational in shape.

[0008] The cap and the tooth cap are respectively set at both ends of the spoke body. The cap and the tooth cap are provided with mounting parts adapted to the metal parts. The metal parts are wedged into the mounting parts to fix the cap and the tooth cap to the two ends of the spoke.

[0009] As a further improvement, the cross-section of the metal part is a 2-4 level mounting structure.

[0010] As a further improvement, the metal part is a two-stage mounting structure, which includes a first-stage mounting structure and a second-stage mounting structure arranged along the extension direction of both ends of the spoke body, and the mounting part is an assembly connection groove corresponding to the first-stage mounting structure and the second-stage mounting structure.

[0011] As a further improvement, the first-stage mounting structure is a cylindrical three-dimensional structure, and the second-stage mounting structure is a slot-shaped three-dimensional structure.

[0012] As a further improvement, the first-stage mounting structure is a cylindrical three-dimensional structure, and the second-stage mounting structure is a rectangular three-dimensional structure with an inclined surface at the end.

[0013] As a further improvement, the first-stage mounting structure is a cylindrical three-dimensional structure, and the second-stage mounting structure is a sawtooth three-dimensional structure.

[0014] As a further improvement, both the first-stage and second-stage mounting structures are cylindrical three-dimensional structures, and the top surface of the end of the second-stage mounting structure is provided with a keyway structure that runs through both the first-stage and second-stage mounting structures.

[0015] As a further improvement, the length of the first-stage installation structure is L1, and the length of the second-stage installation structure is L2, then L1:L2 = 1:2~3.

[0016] As a further improvement, the spokes, cap, and teeth are all made of carbon fiber.

[0017] The beneficial effects of this invention are as follows: the mounting portions at both ends of the spokes are designed as non-rotating stepped structures, which, together with the fitting mounting portions inside the cap and toothed cap, form a wedge-type fixation. The non-rotating shape effectively eliminates the relative rotational freedom between the metal parts and the cap / toothed cap, preventing the spokes from twisting under stress. The stepped structure's decreasing size design enhances the self-locking effect during installation, ensuring a stable connection and solving the problems of easy loosening and limit failure in traditional conical rotating structures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram provided in Embodiment 1 of this utility model.

[0020] Figure 2 This is an exploded structural diagram of the spokes and cap provided in Embodiment 1 of this utility model.

[0021] Figure 3 This is an exploded structural diagram of the spokes and cap provided in Embodiment 2 of this utility model.

[0022] Figure 4 This is an exploded structural diagram of the spokes and cap provided in Embodiment 3 of this utility model.

[0023] Figure 5 This is an exploded structural diagram of the spokes and cap provided in Embodiment 4 of this utility model.

[0024] The attached diagram is labeled as follows:

[0025] 10. Spoke; 11. Spoke body; 12. Metal part; 121. First-stage mounting structure; 1211. Cylindrical three-dimensional structure; 122. Second-stage mounting structure; 1221. Groove-shaped three-dimensional structure; 1222. Inclined surface; 1223. Serrated three-dimensional structure; 123. Keyway structure;

[0026] 20. Cap head; 21. Mounting part;

[0027] 30. Dental cap. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0029] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] Example 1:

[0031] Reference Figures 1-2 As shown, a spoke 10 locking structure for preventing spoke 10 from twisting includes a spoke 10, a spoke body 11, and metal parts 12 disposed at both ends of the spoke body 11. The cross-section of the metal parts 12 is a stepped structure, and the dimensions of the metal parts 12 decrease along the extension direction of both ends of the spoke body 11. The metal parts are non-rotating shapes.

[0032] The cap 20 and the toothed cap 30 are respectively disposed at both ends of the spoke body 11. The cap 20 and the toothed cap 30 are provided with mounting portions 21 adapted to the metal parts 12. The metal parts 12 are wedged into the mounting portions 21, thereby fixing the cap 20 and the toothed cap 30 to the two ends of the spoke 10. As a further improvement, the length of the first-stage mounting structure 111 is L1, and the length of the second-stage mounting structure 112 is L2, then L1:L2 = 1:2~3. Limiting the length ratio of the first stage to the second stage to 1:2~3 ensures that the second stage (the main stress-bearing part) has sufficient contact length to distribute stress. This ratio optimizes mechanical properties, avoids stress concentration caused by length imbalance, and extends service life.

[0033] The spokes 10, the cap 20, and the tooth cap 30 are all made of carbon fiber. The use of carbon fiber in the spoke manufacturing fully utilizes the high strength, lightweight, and fatigue resistance of carbon fiber. The synergistic effect of the material and structural design reduces overall weight while improving corrosion resistance and durability.

[0034] As a further improvement, the cross-section of the metal part 12 has a 2-4 step mounting structure, which balances structural strength and manufacturing feasibility. Fewer steps simplify the processing and reduce costs; more steps provide more contact surface, disperse stress, and enhance shear resistance. This range can be flexibly adjusted according to actual needs to balance performance and production costs.

[0035] In this embodiment, the metal part 12 is a two-stage mounting structure. The metal part 12 includes a first-stage mounting structure 111 and a second-stage mounting structure 112 arranged along the extension direction of both ends of the spoke body 11. The mounting part 21 is an assembly connection groove corresponding to the first-stage mounting structure 111 and the second-stage mounting structure 112.

[0036] As a further improvement, the first-stage mounting structure 111 is a cylindrical three-dimensional structure 1111, and the second-stage mounting structure 112 is a slotted three-dimensional structure 1121. This combination of a cylindrical first stage and a slotted second stage simplifies the installation process by utilizing the guiding effect of the cylinder, while the slotted structure forms a mechanical interlock through asymmetrical contact surfaces. This design significantly improves torsional resistance while ensuring easy assembly and disassembly, making it particularly suitable for high-frequency vibration environments.

[0037] Example 2:

[0038] Reference Figure 3As shown, both the first-stage mounting structure 111 and the second-stage mounting structure 112 are cylindrical three-dimensional structures 1111, while the second-stage mounting structure 112 has an inclined surface 1122 at its end. Both stages are cylindrical, but the second stage has an inclined surface at its end. The inclined surface generates a progressive clamping force during wedging, making the contact between the spokes and the cap / tooth cap tighter. This design optimizes stress distribution, reduces localized wear, and the self-locking effect of the inclined surface further prevents loosening.

[0039] Example 3:

[0040] Reference Figure 4 As shown, the first-stage mounting structure 111 is a cylindrical three-dimensional structure 1111, and the second-stage mounting structure 112 is a serrated three-dimensional structure 1123. The second stage adopts a serrated three-dimensional structure, which forms a multi-point mechanical lock through the interlocking action of the serrations. The sharp angle design of the serrations can significantly increase the friction, especially when the spokes are subjected to lateral forces, which can effectively suppress small displacements and improve the torsional reliability of the overall structure.

[0041] Example 4:

[0042] Reference Figure 5 As shown, the first-stage mounting structure 121 is a cylindrical three-dimensional structure 1211, and the second-stage mounting structure 122 is a rectangular three-dimensional structure. A keyway structure 113 is provided on the top surface of the end of the second-stage mounting structure 122, penetrating both the first-stage and second-stage mounting structures 111 and 112. The keyway structure penetrates both mounting sections and achieves rigid locking by inserting an external key pin. The keyway provides a clear rotational limit, completely eliminating the risk of relative rotation between the spokes and the connecting parts, making it suitable for high-torque or impact load scenarios, and further enhancing structural rigidity.

[0043] The manufacturing process of this utility model includes the following steps:

[0044] S1: Material selection and pretreatment: High-strength carbon fiber is selected as the raw material, and the number of superimposed layers of carbon fiber in the 0-degree direction and the arrangement in the angular direction are determined according to the carbon spoke specifications. The carbon fiber is then rolled and rounded manually or by machine.

[0045] S2: Mold forming: The carbon spoke body is formed by forming a carbon spoke mold, heated and formed, and then the length is taken according to the actual required length specifications. The two ends of the carbon spoke are then finely ground.

[0046] S3: The metal parts are fitted onto both ends of the spoke body according to the direction of the spokes;

[0047] S4: Bonding high-performance adhesive sheet and carbon cloth: After inserting the metal part, bond high-performance adhesive sheet and carbon cloth to both ends of the carbon spoke body, and then manually tamp it down. The metal part is then pulled into place at both ends. A thermosetting shape memory polymer is added between the adhesive sheet and the carbon cloth.

[0048] S5: Secondary bonding of high-performance adhesive sheet and carbon cloth: At the connection between the lower end of the metal part and the carbon spoke, high-performance adhesive sheet and carbon cloth are bonded again according to the set specifications and then manually rubbed together. A thermosetting shape memory polymer is added between the adhesive sheet and the carbon cloth.

[0049] S6: Molding: The compacted carbon spokes are placed into the corresponding molding mold and heated to form carbon fiber spokes;

[0050] S7: Spray an anti-corrosion coating onto the surface of the carbon fiber spokes, and then dry them to obtain the finished product.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel, characterized in that, include: The spoke (10) includes a spoke body (11) and metal parts (12) disposed at both ends of the spoke body (11). The cross section of the metal parts (12) is a stepped structure. The dimensions of the metal parts (12) decrease along the extension direction of both ends of the spoke body (11). The metal parts (12) are non-rotational shapes. The cap (20) and the tooth cap (30) are respectively disposed at both ends of the spoke body (11). The cap (20) and the tooth cap (30) are provided with mounting parts (21) adapted to the metal parts (12). The metal parts (12) are wedged into the mounting parts (21) to fix the cap (20) and the tooth cap (30) to the two ends of the spoke (10).

2. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 1, characterized in that, The cross-section of the metal part (12) is a 2-4 level mounting structure.

3. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 2, characterized in that, The metal part (12) is a two-stage mounting structure. The metal part (12) includes a first-stage mounting structure (121) and a second-stage mounting structure (122) arranged along the extension direction of both ends of the spoke body (11). The mounting part (21) is an assembly connection groove corresponding to the first-stage mounting structure (121) and the second-stage mounting structure (122).

4. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 3, characterized in that, The first-stage installation structure (121) is a cylindrical three-dimensional structure (1211), and the second-stage installation structure (122) is a slot-shaped three-dimensional structure (1221).

5. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 3, characterized in that, The first-stage installation structure (121) is a cylindrical three-dimensional structure (1211), and the second-stage installation structure (122) is a rectangular three-dimensional structure. An inclined surface (1222) is provided at the end of the second-stage installation structure (122).

6. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 3, characterized in that, The first-stage installation structure (121) is a cylindrical three-dimensional structure (1211), and the second-stage installation structure (122) is a sawtooth three-dimensional structure (1223).

7. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 3, characterized in that, Both the first-stage mounting structure (121) and the second-stage mounting structure (122) are cylindrical three-dimensional structures (1211). The top surface of the end of the second-stage mounting structure (122) is provided with a keyway structure (123) that penetrates the first-stage mounting structure (121) and the second-stage mounting structure (122).

8. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 3, characterized in that, The length of the first-stage installation structure (121) is L1, and the length of the second-stage installation structure (122) is L2. Then, L1:L2 = 1:2~3.

9. A carbon fiber spoke for preventing relative displacement between a metal part and a carbon fiber mandrel according to claim 1, characterized in that, The spokes (10), cap (20) and tooth cap (30) are all made of carbon fiber material.

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