High-hardness variable-diameter spoke

Abstract

This invention discloses a high-hardness variable-diameter spoke, comprising a titanium alloy rod body. The titanium alloy rod body includes a central variable-diameter rod section, threaded sections at both ends, and bent ends. The central variable-diameter rod section has an ellipsoidal reinforcement section near the threaded section, a cylindrical reinforcement section near the bent ends, and a long rod section located between the ellipsoidal and cylindrical reinforcement sections. The axial diameter of the long rod section is smaller than that of the ellipsoidal and cylindrical reinforcement sections, and the surface of the long rod section is sandblasted and then wound with a carbon fiber filament layer. The two ends of the carbon fiber filament layer are flush with and connected to the ellipsoidal and cylindrical reinforcement sections. This invention, by setting a titanium alloy rod body with a central variable-diameter rod section, utilizes the ellipsoidal and cylindrical reinforcement sections to strengthen the compressive strength of the rim and hub, respectively, thereby improving its own strength. The central long rod section has a smaller axial diameter and is wound with a layer of carbon fiber filament to increase hardness, meeting the requirements of current racing bicycle applications.

Description

Technical Field

[0001] This utility model belongs to the field of spoke technology, specifically, it relates to a high-hardness variable diameter spoke. Background Technology

[0002] Spokes are one of the most important components of a bicycle, and their quality directly affects the overall performance of the bike. Currently, most spokes are long, rod-shaped, uniform-diameter spokes, molded in one piece. This results in uneven stress distribution because the spokes experience stronger pressure at both ends and less in the middle, with the highest pressure occurring at the rim and then the hub. Studies show that the rim connection bears approximately 70% of the peak stress, while the stress in the middle section is only 30%-40% of the peak. Therefore, the middle section has a high strength redundancy. Furthermore, traditional spokes made of steel are heavy and lack strength and hardness, making them particularly unsuitable for modern racing bicycles. Therefore, further optimization and improvement of the overall structure of traditional steel uniform-diameter spokes are needed. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide a high-hardness variable diameter spoke, so as to avoid the trouble of the previous spoke rods with constant diameter setting, which are subjected to uneven stress distribution in actual application, have low durability, and have limited overall strength and hardness, making them unsuitable for racing bicycles.

[0004] To solve the above-mentioned technical problems, this utility model discloses a high-hardness variable diameter spoke, which includes a titanium alloy rod body. The titanium alloy rod body includes a middle variable diameter rod part, threaded parts and bent heads located at both ends. The middle variable diameter rod part has an ellipsoidal reinforcement part near the threaded part, a cylindrical reinforcement part near the bent head, and a long rod part located between the ellipsoidal reinforcement part and the cylindrical reinforcement part. The axial diameter of the long rod part is smaller than that of the ellipsoidal reinforcement part and the cylindrical reinforcement part. The surface of the long rod part is sandblasted and then wound with a carbon fiber filament layer. The two ends of the carbon fiber filament layer are flush with and connected to the ellipsoidal reinforcement part and the cylindrical reinforcement part.

[0005] According to one embodiment of the present invention, the shaft diameter of the aforementioned long rod portion is 2mm.

[0006] According to one embodiment of the present invention, the carbon fiber filament layer and the long rod are bonded together with epoxy resin and then cured.

[0007] According to one embodiment of the present invention, the intermediate diameter of the ellipsoidal reinforcing part is larger than the diameter of the cylindrical reinforcing part.

[0008] According to one embodiment of the present invention, the end diameter of the ellipsoidal portion and the end diameter of the cylindrical reinforcing portion are equal, and the end diameter is 3-4 mm.

[0009] Compared with the prior art, the present invention can achieve the following technical effects:

[0010] By incorporating a titanium alloy rod with a variable diameter section in the middle, the ellipsoidal reinforcement and cylindrical reinforcement sections enhance the compressive strength of the rim and hub, respectively, thereby improving its own strength. The long shaft section in the middle has a smaller shaft diameter and is wrapped with a layer of carbon fiber to increase rigidity, meeting the requirements of current racing bicycle applications.

[0011] Of course, any product implementing this utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0013] Figure 1 This is a schematic diagram of a high-hardness variable-diameter spoke according to an embodiment of the present invention.

[0014] Attached Figure Labels

[0015] Titanium alloy rod body 10, intermediate variable diameter rod section 11, threaded section 12, bent head 13, ellipsoidal reinforcement section 21, cylindrical reinforcement section 22, long rod section 23, carbon fiber filament layer 30. Detailed Implementation

[0016] The following will describe in detail the implementation of this utility model with reference to the accompanying drawings and embodiments, so that the implementation of this utility model can be fully understood and carried out based on how technical means are used to solve technical problems and achieve technical effects.

[0017] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a high-hardness variable-diameter spoke according to an embodiment of the present invention.

[0018] As shown in the figure, a high-hardness variable diameter spoke includes a titanium alloy rod body 10. The titanium alloy rod body 10 includes a middle variable diameter rod portion 11, threaded portions 12 and bent heads 13 located at both ends. The middle variable diameter rod portion 11 has an ellipsoidal reinforcement portion 21 near the threaded portion 12, a cylindrical reinforcement portion 22 near the bent head 13, and a long rod portion 23 located between the ellipsoidal reinforcement portion 21 and the cylindrical reinforcement portion 22. The axial diameter of the long rod portion 23 is smaller than that of the ellipsoidal reinforcement portion 21 and the cylindrical reinforcement portion 22. The surface of the long rod portion is sandblasted and then wound with a carbon fiber filament layer. The two ends of the carbon fiber filament layer are flush with and connected to the ellipsoidal reinforcement portion and the cylindrical reinforcement portion.

[0019] In one embodiment of this utility model, the titanium alloy rod body 10 consists of a central variable-diameter rod section 11, a threaded section 12, and a bent head 13. The threaded section 12 is installed to the rim, and the bent head 13 is installed to the hub. The central variable-diameter rod section 11 features a variable-diameter design, with thickened ellipsoidal reinforcement sections 21 and cylindrical reinforcement sections 22 at both ends to respectively reinforce the rim section, which experiences the greatest pressure, and the hub section, which experiences the next least pressure, thereby increasing the strength at both ends. The long rod section 23 has the smallest shaft diameter, serving as a transition section. The long rod section 23 undergoes sandblasting to improve surface roughness, and then is wound with carbon fiber filaments, forming external protection while achieving a lightweight design that meets the current design requirements of racing road bicycles.

[0020] In detail, the carbon fiber filament layer 30 and the long rod portion 23 are bonded together with epoxy resin and then cured. The specific process is as follows: the long rod portion 23 is sandblasted to improve its roughness, then coated with epoxy resin, and then carbon fiber filaments are wound around it one loop at a time using a winding machine. After high-temperature curing, the carbon fiber filament layer 30 is formed. The high hardness of the carbon fiber enhances the hardness of the long rod portion 23, while also being lightweight.

[0021] Preferably, the shaft diameter of the long rod 23 is 2mm, which ensures its strength.

[0022] The ellipsoidal reinforcement 21 of this utility model is ellipsoidal, and its central axis diameter is larger than that of the cylindrical reinforcement 22. It has stronger pressure resistance, can adapt to the maximum pressure on the wheel rim, and has better durability.

[0023] In addition, the axial diameter of the end of the ellipsoidal part 23 is equal to that of the cylindrical reinforcement part 22, and the axial diameter is 3-4mm, which can smoothly transition the carbon fiber filament layer 30 and resist wind resistance.

[0024] In summary, this utility model improves the strength of a titanium alloy rod 10 with a central variable diameter rod section 11 by using its ellipsoidal reinforcement section 21 and cylindrical reinforcement section 22 to enhance the compressive strength of the rim and hub, respectively. The central long rod section 23 has a smaller shaft diameter and is wrapped with a layer of carbon fiber filament 30 to increase its hardness, thus meeting the requirements of current racing bicycle applications.

[0025] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A high stiffness variable diameter spoke, characterized by, include: A titanium alloy rod body includes a central variable diameter rod section, threaded sections at both ends, and bent heads. The central variable diameter rod section has an ellipsoidal reinforcement section near the threaded section, a cylindrical reinforcement section near the bent head, and a long rod section located between the ellipsoidal reinforcement section and the cylindrical reinforcement section. The axial diameter of the long rod section is smaller than that of the ellipsoidal reinforcement section and the cylindrical reinforcement section. The surface of the long rod section is sandblasted and then wound with a carbon fiber filament layer. The two ends of the carbon fiber filament layer are flush with and connected to the ellipsoidal reinforcement section and the cylindrical reinforcement section.

2. The high-hardness variable-diameter spoke according to claim 1, characterized in that, The shaft diameter of the long rod section is 2 mm.

3. The high-hardness variable-diameter spoke according to claim 1, characterized in that, The carbon fiber filament layer is bonded to the long rod portion with epoxy resin and then cured.

4. The high-hardness variable-diameter spoke according to claim 1, characterized in that, The central diameter of the ellipsoidal reinforcement is larger than the diameter of the cylindrical reinforcement.

5. The high-hardness variable-diameter spoke according to claim 1, characterized in that, The end diameter of the ellipsoidal reinforcement is equal to the diameter of the cylindrical reinforcement, and the diameter is 3-4 mm.

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