Aramid fiber rope anti-off spoke mounting structure

Abstract

The utility model provides a kind of aramid rope anti-drop spoke mounting structure, comprising: aramid spoke, including spoke main body and the installation component being set to the both ends of spoke main body, the outside section of installation component is in echelon structure, installation component is along the both ends of spoke main body extension direction size increasing, the installation component is non-rotating body shape;Setting to the dental cap of aramid spoke both ends, the dental cap is in with the connecting portion of installation component adaptation is set, installation component is wedged into connecting portion and further the dental cap is fixed on the both ends of aramid spoke portion.Upper installation component is set in non-rotating body shape both ends, and with the dental cap fixed connection being set on wheel rim, aramid fiber can be prevented from showing weak when bearing compression force, shear force or torsional load, the problem that spoke torsion can appear in the riding process, improve riding stability.

Description

Technical Field

[0001] This utility model relates to an aramid rope anti-detachment spoke installation structure. Background Technology

[0002] Aramid spokes (usually referring to spokes or spoke cores made using aramid fibers, such as the well-known Kevlar) are a relatively niche but distinctive option for bicycle wheelsets. They utilize the unique properties of aramid fibers to deliver a riding experience drastically different from traditional metal spokes (steel, aluminum alloy, titanium alloy). Aramid fibers have a much lower density than metals (steel's density is approximately 7.8 g / cm³). 3 Aramid content approximately 1.44 g / cm³ 3 This makes the aramid spokes extremely lightweight, significantly reducing the overall weight of the wheelset, especially the moment of inertia, which has a positive impact on acceleration and climbing performance.

[0003] However, aramid fibers are relatively weak when subjected to compressive force, shear force, or torsional load. The lateral rigidity and torsional rigidity of aramid spoke wheel sets are usually lower than those of high-quality metal spoke wheel sets under the same tension. Spoke torsion may occur during riding, thus affecting riding stability. In order to address the above problems, this utility model designs an aramid rope anti-detachment spoke installation structure and manufacturing process. Utility Model Content

[0004] This invention provides an aramid rope anti-detachment spoke installation structure, which can effectively solve the above-mentioned problems.

[0005] This utility model is implemented as follows:

[0006] An aramid rope anti-derailment spoke installation structure includes:

[0007] Aramid spokes include a spoke body and mounting components disposed at both ends of the spoke body. The outer cross-section of the mounting components has a stepped structure, and the dimensions of the mounting components increase along the extension direction of both ends of the spoke body. The mounting components are non-rotational in shape.

[0008] The toothed caps are set at both ends of the aramid spokes. The toothed caps have connecting parts that are adapted to the mounting components. The mounting components are wedged into the connecting parts to fix the toothed caps to both ends of the aramid spokes.

[0009] As a further improvement, the spoke body includes a flexible metal core and a bundle of aramid fibers spirally wound around the outer periphery of the flexible metal core.

[0010] As a further improvement, the diameters of the flexible metal core and the aramid fiber bundle satisfy the following relationship: r:R = 1:1.5~2, where r is the diameter of the flexible metal core and R is the diameter of the aramid fiber bundle.

[0011] As a further improvement, the winding pitch of the aramid fiber bundle satisfies the following relationship: P=K*π*D*cot(θ), where K is the winding pitch coefficient, P is the winding pitch, D is the winding point diameter, and θ is the winding angle.

[0012] As a further improvement, the diameter of the winding point is D = r + 2R, and the winding angle is θ = 5~18°.

[0013] As a further improvement, the mounting assembly includes metal sleeves disposed at both ends of the flexible metal core and the aramid fiber bundle, and a metal mounting component connected to the metal sleeves. The metal sleeves include a receiving cavity with one end open, and a mounting hole is provided at the bottom of the receiving cavity. The aramid fiber bundle is disposed in the receiving cavity, and the flexible metal core passes through the mounting hole for welding. The cross-section of the metal mounting component has a stepped structure, and the dimensions of the metal mounting component increase along the extension direction of both ends of the spoke body. The metal mounting component is a non-rotational shape.

[0014] As a further improvement, the outer cross-section of the metal mounting component is a 2-4 step mounting structure.

[0015] As a further improvement, the metal mounting component 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 connecting part is an assembly connection groove corresponding to the first-stage mounting structure and the second-stage mounting structure.

[0016] 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.

[0017] A manufacturing process for an aramid rope anti-derailment spoke mounting structure includes:

[0018] S1: Calculate the diameter r of the flexible metal core, the diameter R of the aramid fiber bundle, and the winding angle θ;

[0019] S2: Prepare the flexible metal core and aramid fiber bundle materials and clean them;

[0020] S3: The flexible metal core is impregnated with resin. The winding equipment is set with parameters and the aramid fiber bundle is wound onto the outer surface of the flexible metal core in a double helix cross manner. The wound spoke body is heated to cure the resin.

[0021] S4; The flexible metal core passes through the mounting hole and is welded to the metal sleeve; The aramid fiber bundle is placed in the receiving cavity, bonded with resin adhesive, and then heated and cured.

[0022] S5: Wed the metal mounting piece into the tooth cap and connect the metal mounting piece to the metal sleeve.

[0023] The beneficial effects of this utility model are:

[0024] (1) By fixing the mounting components at both ends of the non-rotating body shape to the tooth caps set on the rim, the aramid fiber can be prevented from being weak when subjected to compressive force, shear force or torsional load, which may cause spoke twisting during riding, thus improving riding stability.

[0025] The spoke body consists of a flexible metal core and a bundle of aramid fibers spirally wound around the outer periphery of the flexible metal core. The flexible metal core can effectively increase the torsional resistance of the aramid spokes and improve the performance of aramid fibers in withstanding compressive force, shear force or torsional load. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model.

[0028] Figure 2 This is an exploded structural diagram provided in an embodiment of the present invention.

[0029] Figure 3 This is a cross-sectional structural diagram provided in an embodiment of the present invention.

[0030] The attached diagram is labeled as follows:

[0031] 10. Aramid spokes; 11. Spoke body; 111. Flexible metal core; 112. Aramid fiber bundle; 12. Mounting assembly; 121. Metal sleeve; 122. Metal mounting component; 1221. First-stage mounting structure; 1222. Second-stage mounting structure;

[0032] 20. Tooth cap; 21. Connecting part. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] Reference Figures 1-3 As shown, an aramid rope anti-derailment spoke installation structure includes:

[0036] Aramid spoke 10 includes a spoke body 11 and mounting components 12 disposed at both ends of the spoke body 11. The outer cross section of the mounting components 12 has a stepped structure. The dimensions of the mounting components 12 increase along the extension direction of both ends of the spoke body 11. The mounting components 12 are non-rotational.

[0037] The toothed caps 20 are disposed at both ends of the aramid spokes 10. Each toothed cap 20 has a connecting portion 21 adapted to the mounting assembly 12. The mounting assembly 12 is wedged into the connecting portion 21 to fix the toothed caps 20 to both ends of the aramid spokes 10. In this embodiment, the toothed caps 20 are made of carbon fiber. The use of carbon fiber in the spokes fully utilizes the high strength, lightweight, and fatigue resistance of carbon fiber. The synergistic effect of material and structural design reduces overall weight while improving corrosion resistance and durability. Non-rotational designs (such as polygonal or spline shapes) eliminate relative rotation between the aramid spokes 10 and the toothed caps 20 through geometric interlocking. This is the most effective means to solve the problem of "slippage" or "loosening" of the aramid spokes 10 during driving and braking due to low torsional stiffness.

[0038] As a further improvement, the spoke body 11 includes a flexible metal core 111 and an aramid fiber bundle 112 spirally wound around the outer periphery of the flexible metal core 111. The flexible metal core 111 effectively increases the torsional resistance of the aramid spoke 10, improving the performance of the aramid fiber under compressive, shear, or torsional loads. Compared to traditional steel and carbon fiber spokes, this aramid spoke 10 has excellent damping characteristics, effectively absorbing minor vibrations and high-frequency vibrations from the road surface. This significantly improves comfort during long-distance riding or on rough roads, reducing hand and body fatigue. This level of comfort is difficult for metal spokes to match. However, because the lateral and torsional stiffness of aramid spoke wheelsets are generally lower than those of high-quality metal spoke wheelsets under the same tension, they exhibit greater lateral deformation during hard sprints, high-speed cornering, or when subjected to crosswinds, affecting handling precision and responsiveness. This is the biggest factor limiting its widespread application in the racing field. Therefore, by adding a flexible metal core 111 inside the aramid fiber bundle 112 for limiting, this invention can greatly increase the performance when subjected to compressive force, shear force or torsional load. Furthermore, since the flexible metal core 111 is deformable, the aramid spokes 10 of this invention still have good damping characteristics, which can provide comfort for long-distance riding or rough roads.

[0039] The diameters of the flexible metal core 111 and the aramid fiber bundle 112 satisfy the following relationship: r:R = 1:1.5~2, where r is the diameter of the flexible metal core and R is the diameter of the aramid fiber bundle. Since the aramid spoke is mainly composed of the aramid fiber bundle 112, the size of the flexible metal core 111 cannot be too large. If r:R < 1:1.5, the flexibility of the flexible metal core 111 decreases, and the advantage of the aramid spoke in improving riding comfort will no longer be significant. If r:R > 1:2, the lateral stiffness and torsional stiffness of the aramid spoke wheel set will decrease. Therefore, in order to balance the riding comfort and stiffness performance of the aramid spoke, the diameters of the flexible metal core 111 and the aramid fiber bundle 112 in this embodiment satisfy the following relationship: r:R = 1:1.5, which can ensure both the riding comfort and riding stability of the aramid spoke 10.

[0040] The winding pitch refers to the distance traveled by the aramid fiber bundle as it winds around the metal core, moving one complete spiral turn (360°) along the direction of the flexible metal core 111. The winding pitch of the aramid fiber bundle satisfies the following relationship: P = K * π * D * cot(θ), where K is the winding pitch coefficient, P is the winding pitch, D is the diameter of the winding point, and θ is the winding angle. Furthermore, the diameter of the winding point, D = r + 2R, is not a constant value. It is equal to the diameter of the flexible metal core 111 plus twice the diameter of the aramid fiber bundle 112. The winding angle θ = 5–18° is a design input value, determined according to the performance requirements of the spokes. When the winding angle is small (e.g., θ = 5–10°), the fibers are more closely aligned axially, maximizing tensile stiffness and strength. This is the preferred angle for the spokes. When the winding angle is large (e.g., θ > 25°), better torsional resistance and circumferential strength are provided, but axial performance is sacrificed. Therefore, for the aramid spokes in this embodiment, θ = 10–12° is an excellent value, achieving a balance between tensile properties and manufacturing feasibility. Precise pitch control is not merely for aesthetic purposes; it directly determines the final performance and quality of the product. The pitch P directly determines the winding angle θ, which is the theoretical basis for calculating the tensile stiffness and strength of the composite spokes. According to the principles of composite material mechanics, the axial stiffness of a composite material is related to its cosine stability. 4(θ) is proportional. A constant pitch ensures that the winding angle of each spoke and each segment is completely consistent, thus ensuring highly consistent and predictable mechanical properties throughout the batch. You can even design spokes with different properties by changing the pitch (e.g., using a smaller pitch / smaller angle on the drive-side spokes to increase rigidity). This aramid spoke 10 avoids localized stress concentration caused by pitch / angle fluctuations, allowing all aramid fibers to share the load evenly, thus getting closer to their theoretical strength value. If the pitch is uneven, some fibers will be looser or tighter than others. Under tension, tight fibers will bear the majority of the load first and are prone to premature breakage. Once one breaks, the load will transfer to adjacent fibers, triggering a chain reaction. Uniform pitch ensures that all fibers work simultaneously and stretch synchronously, significantly improving the product's ultimate tensile strength and fatigue life. Uniform pitch creates uniform channels for resin flow and wetting. Consistent pitch means that the gap size between fiber bundles is consistent. During resin impregnation, the resin can penetrate evenly throughout the entire fiber bundle, preventing resin buildup in some areas or dry spots in others, which can lead to defects and stress concentration. This is crucial for controlling the resin content within the optimal range. Uniform pitch is a direct reflection of high-level manufacturing processes, resulting in a neat and uniform appearance. Pitch uniformity directly affects the final spoke diameter consistency. 100% online detection is possible using a laser diameter gauge; any pitch deviation will immediately manifest as a small fluctuation in diameter, thus becoming a key quality control indicator, facilitating timely detection and adjustment of process parameters. It provides a uniform foundation for end-molding or press-fitting processes. Uniformly wound fiber bundles can fill the metal sleeve's receiving cavity more regularly and predictably, facilitating resin filling and the formation of a dense structure. This reduces the risk of defects such as air bubbles or insufficient resin in the end area, fundamentally improving the reliability of the end connection. In one embodiment, r = 1 mm, R = 1.5 mm. Therefore, the diameter of the winding point D = 1 + 2 * 1.5 = 4 mm, the winding angle θ is chosen to be a suitable 12°, and K is 0.1. Therefore, the winding pitch of the aramid spoke 10 is P = K * π * D * cot(θ) = 0.1 * 4 * π * cot(12°) = 5.9 mm.

[0041] As a further improvement, the mounting assembly 12 includes metal sleeves 121 disposed at both ends of the flexible metal core 111 and the aramid fiber bundle 112, and a metal mounting member 122 connected to the metal sleeves 121. In this embodiment, the metal sleeves 121 and the metal mounting member 122 are connected by threads (not shown in the figure). The metal sleeve 121 includes a receiving cavity with one end open, and a mounting hole is provided at the bottom of the receiving cavity. The aramid fiber bundle 112 is disposed in the receiving cavity, and the flexible metal core 111 passes through the mounting hole for welding. Welding provides the strongest and most durable connection between the metal core and the sleeve, far exceeding the reliability of pure adhesive bonding. Adhesive bonding and curing of the aramid bundle fully utilizes the wetting and bonding force of the resin system on the fibers, effectively transferring the tensile load from the fibers to the metal sleeve.

[0042] The metal mounting component 122 has a stepped cross-section, with its dimensions increasing along both ends of the spoke body 11. The metal mounting component 122 is a non-rotating shape, and its outer cross-section has a 2-4 step mounting structure. In this embodiment, the metal mounting component 122 has a 2-step mounting structure, including a first-step mounting structure 1221 and a second-step mounting structure 1222 extending along both ends of the spoke body 11. The connecting part 21 is an assembly connection groove corresponding to the first-step mounting structure 1221 and the second-step mounting structure 1222. The first-step mounting structure 1221 is a cylindrical three-dimensional structure, and the second-step mounting structure 1222 is a slotted three-dimensional structure. This combination of a cylindrical first step and a slotted second step 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.

[0043] In other embodiments, the first-stage mounting structure 1221 is a cylindrical three-dimensional structure, and the second-stage mounting structure 1222 is a rectangular three-dimensional structure. A keyway structure penetrating both the first-stage and second-stage mounting structures is provided on the top surface of the end of the second-stage mounting structure 1222. 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 connector, making it suitable for high-torque or impact load scenarios, and further enhancing structural rigidity.

[0044] In another embodiment, both the first-stage mounting structure 1221 and the second-stage mounting structure 1222 are cylindrical three-dimensional structures, with the second-stage mounting structure 1221 having an inclined surface 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.

[0045] In another embodiment, the first-stage mounting structure 1221 is a cylindrical three-dimensional structure, and the second-stage mounting structure 1222 is a serrated three-dimensional structure. The second-stage serrated three-dimensional structure 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, effectively suppressing small displacements and improving the torsional reliability of the overall structure.

[0046] A manufacturing process for an aramid rope anti-derailment spoke mounting structure includes:

[0047] S1: Calculate the diameter r of the flexible metal core 111, the diameter R of the aramid fiber bundle 112, and the winding angle;

[0048] S2: Prepare the flexible metal core 111 and aramid fiber bundle 112 materials and clean them;

[0049] S3: The flexible metal core 111 is impregnated with resin. The winding equipment is set with parameters, and the aramid fiber bundle 112 is wound onto the outer surface of the flexible metal core 111 in a double helix cross manner. The wound spoke body 11 is heated to cure the resin. The winding equipment used in this utility model is a precision planetary winding machine. This method originated from the cable industry and is used to precisely wind extremely fine metal wires or fiber bundles on a small conductor core. Its core principle is to actively control the laying posture and position of the fiber bundle to ensure that each turn is tight, parallel and with consistent spacing.

[0050] S4; The flexible metal core 111 passes through the mounting hole and is welded to the metal sleeve 121; The aramid fiber bundle 112 is placed in the receiving cavity, bonded with resin adhesive, and then heated and cured.

[0051] S5: Wed the metal mounting piece 122 into the tooth cap 20 and connect the metal mounting piece 122 to the metal sleeve 121.

[0052] 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 spoke installation structure for preventing aramid rope slippage, characterized in that, include: Aramid spokes (10) include a spoke body (11) and mounting components (12) disposed at both ends of the spoke body (11). The outer cross section of the mounting components (12) is stepped. The dimensions of the mounting components (12) increase along the extension direction of both ends of the spoke body (11). The mounting components (12) are non-rotational. The tooth caps (20) are set at both ends of the aramid spokes (10). The tooth caps (20) are made of carbon fiber material. The tooth caps (20) are provided with connecting parts (21) that are adapted to the mounting components (12). The mounting components (12) are wedged into the connecting parts (21) to fix the tooth caps (20) to both ends of the aramid spokes (10).

2. The aramid rope anti-derailment spoke installation structure according to claim 1, characterized in that, The spoke body (11) includes a flexible metal core (111) and an aramid fiber bundle (112) spirally wound around the outer periphery of the flexible metal core (111).

3. The aramid rope anti-derailment spoke installation structure according to claim 2, characterized in that, The diameters of the flexible metal core (111) and the aramid fiber bundle (112) satisfy the following relationship: r:R=1:1.5~2, where r is the diameter of the flexible metal core (111) and R is the diameter of the aramid fiber bundle (112).

4. The aramid rope anti-derailment spoke installation structure according to claim 3, characterized in that, The winding pitch of the aramid fiber bundle (112) satisfies the following relationship: P=K* *D* Where K is the winding pitch coefficient, P is the winding pitch, and D is the diameter of the winding point. The wrapping angle.

5. The aramid rope anti-derailment spoke installation structure according to claim 4, characterized in that, The diameter of the winding point D = r + 2R, and the winding angle =5~18°.

6. The aramid rope anti-derailment spoke installation structure according to claim 2, characterized in that, The mounting assembly (12) includes a metal sleeve (121) disposed at both ends of the flexible metal core (111) and the aramid fiber bundle (112), and a metal mounting member (122) connected to the metal sleeve (121). The metal sleeve (121) includes a receiving cavity with one end open. A mounting hole is provided at the bottom of the receiving cavity. The aramid fiber bundle (112) is disposed in the receiving cavity. The flexible metal core (111) passes through the mounting hole for welding. The cross section of the metal mounting member (122) has a stepped structure. The dimensions of the metal mounting member (122) increase along the extension direction of both ends of the spoke body (11). The metal mounting member (122) is a non-rotational shape.

7. The aramid rope anti-derailment spoke installation structure according to claim 6, characterized in that, The outer cross section of the metal mounting component (122) is a 2-4 step mounting structure.

8. The aramid rope anti-derailment spoke installation structure according to claim 7, characterized in that, The metal mounting component (122) is a two-stage mounting structure. The metal mounting component (122) includes a first-stage mounting structure (1221) and a second-stage mounting structure (1222) arranged along the extension direction of both ends of the spoke body (11). The connecting part (21) is an assembly connection groove corresponding to the first-stage mounting structure (1221) and the second-stage mounting structure (1222).

9. The aramid rope anti-derailment spoke installation structure according to claim 8, characterized in that, The first-stage installation structure (1221) is a cylindrical three-dimensional structure, and the second-stage installation structure (1222) is a slot-shaped three-dimensional structure.

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