A bicycle wheel assembly structure

Abstract

The present disclosure relates to the field of bicycles, specifically addressing a bicycle wheel assembly structure. In the field of bicycles, especially in the context of racing bicycles, ensuring structural strength while considering lightweight design is a primary research focus. Carbon fiber has been widely applied in the design of bicycle rims, spokes, and frames due to its excellent material properties, contributing to improved structural strength and lightweight design. The use of carbon fiber spokes, compared to traditional metal spokes, effectively achieves lightweight design while maintaining structural strength, representing a significant advancement in the field of bicycles. However, while carbon fiber possesses excellent tensile strength, its shear fracture resistance (impact resistance) needs improvement. In the event of a fall or collision during bicycle operation, the primary source of impact force is shear force. Therefore, addressing how to enhance shear fracture resistance while ensuring lightweight design in the wheel assembly structure of bicycles is a crucial problem to be solved.

Description

A bicycle wheel assembly structure

[0001] BRIEF DESCRIPTION OF THE DRAWINGS

[0002] FIG. 1 is a schematic diagram of the structure in this scheme.

[0003] FIG. 2 is a schematic cross-sectional diagram of the wheel structure.

[0004] FIG. 3 is a schematic diagram of the spoke connection end.

[0005] DETAILED DESCRIPTION OF THE INVENTION

[0006] The present solution is further described below with reference to the accompanying drawings and embodiments:

[0007] Embodiments 1:

[0008] A bicycle wheel assembly structure, as shown in FIG.1 and FIG.2, comprises a rim 1, a hub 2, and spokes 3 connecting the rim and the hub. The spokes 3 are connected to the rim 1 and the hub 2 through spoke heads, forming the overall structure of the wheel assembly.

[0009] Referring to FIG.2, the rim 1 has a single composite layer structure or a stacked structure of multiple single composite layers. In this embodiment, the rim 1 has a single composite layer structure, where one composite layer forms the main body of the rim.

[0010] Specifically, the single composite layer includes a carbon fiber outer layer 14, a PBO fiber middle layer 15, and a carbon fiber inner layer 16.

[0011] PBO fiber refers to Poly-p-phenylene benzobisoxazole fiber, developed in the 1980s in the United States as a composite material reinforcement for the aerospace industry. PBO fiber exhibits excellent physical and mechanical properties as well as chemical resistance, surpassing both steel and carbon fibers in strength. It also has outstanding shear fracture resistance, friction resistance, and dimensional stability.

[0012] In the molding process, epoxy resin-based carbon fiber prepreg is used as the carbon fiber inner layer 16, laid on the molding device.

[0013] Subsequently, epoxy resin-based PBO fiber-reinforced prepreg is used as the PBO fiber middle layer 15, laid on the carbon fiber inner layer 16.

[0014] Finally, epoxy resin-based carbon fiber prepreg is used as the carbon fiber outer layer 14, laid on the PBO fiber middle layer 15.

[0015] After forming the single composite layer structure of the rim, it undergoes baking, curing, and finally, the polishing process is performed.

[0016] Since all layers are formed using prepreg, during the baking and curing process, they form a composite material.

[0017] It is noteworthy that when forming the complete rim 1, it is fixed as a whole after segmented molding.

[0018] Regarding the specific structure of the rim 1, continuing to refer to FIG.2, the rim 1 includes a hollow part 11, an outer tire engagement part 12, and an inner spoke connection position 13.

[0019] The tire engagement part is used to secure the tire, whether it is a pneumatic tire or a tire with an inner tube. The tire engagement part has a vent reservation position 121 compatible with laterally protruding air nozzles for tire inflation and deflation.

[0020] The spoke connection position 13 is used to connect with the spokes, and the spokes are also connected to the hub. The spoke connection position 13 is located in the thickened area of the rim 1 to ensure connection strength.

[0021] Specifically, the end of the spoke 3 is a connecting end 31, and the diameter of the connecting end 31 is larger than the diameter of the spoke body. It is a wedge-type expansion structure with an outward-extending taper.

[0022] This taper is designed to increase in diameter outward. When used with the spoke head, the internal part of the spoke head has a taper surface that matches this taper. As a result, as the spoke is pulled tight, the connection end becomes tighter with the spoke head. The spoke connection position 13 is evenly distributed around the rim 1.

[0023] Specifically, the spoke 3 is a PBO fiber spoke or a PBO and carbon fiber composite spoke.

[0024] When using a PBO fiber spoke, it is made of individual PBO fibers, rolled into a round rod, soaked in a heat-curable resin diluent, taken out after soaking, air-dried, and cured to harden the resin. Epoxy resin-based PBO fiber-reinforced prepreg is then rolled on and thermally cured and polished to form the spoke 3.

[0025] When using a PBO and carbon fiber composite spoke, PBO fibers and carbon fibers are first woven into a composite, then rolled into a round rod, soaked in a heat-curable resin diluent, taken out after soaking, air-dried, and cured to harden the resin. Subsequently, epoxy resin-based PBO fiber-reinforced prepreg or epoxy resin-based PBO and carbon fiber-reinforced prepreg is rolled on and thermally cured, and then polished to form the spoke 3.

[0026] In this embodiment, a PBO and carbon fiber composite spoke is selected.

[0027] Embodiments 2:

[0028] This embodiment differs from Example 1 in that the rim 1 is a stacked structure of multiple single composite layers.

[0029] In the molding steps of the composite layers:

[0030] Epoxy resin-based carbon fiber prepreg is used as the carbon fiber inner layer 16, laid on the molding device.

[0031] Subsequently, epoxy resin-based PBO fiber-reinforced prepreg is used as the PBO fiber middle layer 15, laid on the carbon fiber inner layer 16.

[0032] Finally, epoxy resin-based carbon fiber prepreg is used as the carbon fiber outer layer 14, laid on the PBO fiber middle layer 15.

[0033] Repeating steps 2 and 3 results in a stacked structure of multiple single composite layers.

[0034] Correspondingly, since the size of the rim is fixed, the thickness of each single layer decreases.

[0035] In summary:

[0036] The spokes in this design use PBO fiber spokes or composite spokes of PBO fiber and carbon fiber, effectively enhancing the shear fracture resistance of the wheel assembly spokes, thereby ensuring the stability and safety of the wheel assembly.

[0037] The rim in this design uses a composite of PBO fiber layers or a combination of PBO fiber and carbon fiber rims. Compared to traditional carbon fiber rims, this design not only ensures structural lightweighting but also further improves the shear fracture resistance of the rim.

[0038] The connection between the rim, spokes, and hub in this design is simple, reliable, and stable, conducive to industrial production.

[0039] The above implementation is only intended to illustrate the technical concept and characteristics of the present scheme. Its purpose is to enable those familiar with this technology to understand the content of this scheme and implement it, and should not be construed as limiting the scope of protection of this scheme. Any equivalent transformations or modifications made in accordance with the essence of this scheme should be encompassed within the scope of protection of this scheme.

[0040] In the description of this scheme, it should be noted that, unless explicitly specified and limited, terms such as "installation," "connection," and "linkage" should be broadly interpreted. For example, they can be fixed connections or detachable connections, integral connections, mechanical connections, or electrical connections. They can be directly linked or indirectly linked through an intermediate medium, and can include internal connections between two components.

[0041] For those skilled in the art, the specific meanings of the above terms in this scheme can be understood based on the specific circumstances.

[0042] It should be understood that the above implementation is illustrative and not restrictive. Within the scope of the basic principles of this scheme, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art are encompassed within the scope of the claims of this scheme.

[0043] SUMMARY OF THE INVENTION

[0044] To address the aforementioned issues, the present disclosure provides a bicycle wheel assembly structure that employs PBO (poly-p-phenylene benzobisoxazole) fiber or a combination of PBO fibers. This aims to ensure lightweight design while further enhancing shear fracture resistance.

[0045] The bicycle wheel assembly structure comprises a rim, a hub, and spokes connecting the two. The spokes are PBO fiber spokes or a composite of PBO and carbon fiber. The rim is a PBO fiber rim or a composite rim of PBO and carbon fiber.

[0046] Furthermore, the rim may have a single composite layer structure or multiple single composite layer laminated structures, with each single composite layer comprising an outer layer of carbon fiber, an intermediate layer of PBO fiber, and an inner layer of carbon fiber.

[0047] Additionally, the rim includes a tire engagement portion on the outer circumference of the hollow portion of the rim and spoke connection positions on the inner circumference.

[0048] Moreover, the spoke connection positions are evenly distributed around the rim, and they are located in the thickened area of the rim.

[0049] Furthermore, the tire engagement portion has reserved air hole positions.

[0050] The spokes are PBO fiber and carbon fiber composite spokes, and the two are braided together and solidified by impregnation with epoxy resin.

[0051] The end of the spokes is a connecting end, and the diameter of the connecting end is greater than the diameter of the spoke body, forming a wedge-tightening structure.

[0052] In summary, the present disclosure has the following advantages:

[0053] The use of PBO fiber spokes or a composite of PBO and carbon fiber effectively enhances the shear fracture resistance of the wheel assembly spokes, ensuring the stability of the wheel assembly.

[0054] The adoption of a PBO fiber layer or a composite rim of PBO and carbon fiber in the rim, compared to traditional carbon fiber rims, further improves the shear fracture resistance of the rim while ensuring lightweight design.

[0055] The wedge-tightening structure between the rim, spokes, and hub facilitates reliable and stable connection, promoting industrial production.

Claims

1.A bicycle wheel assembly structure, comprising a rim (1) and a hub (2), further including spokes (3) connecting the two, the spokes (3) are PBO fiber spokes or composite spokes of PBO and carbon fiber, and the rim (1) is a PBO fiber rim or a composite rim of PBO and carbon fiber.2.The bicycle wheel assembly structure according to claim 1, the rim (1) is a single composite layer structure or a stacked structure of multiple single composite layers, wherein the single composite layer comprises a carbon fiber outer layer (14), a PBO fiber middle layer (15), and a carbon fiber inner layer (16).3.The bicycle wheel assembly structure according to claim 2, the rim (1) includes a hollow part (11), an outer tire engagement part (12), and an inner spoke connection position (13).4.The bicycle wheel assembly structure according to claim 3, the spoke connection position (13) is evenly distributed around the rim (1).5.The bicycle wheel assembly structure according to claim 3, the spoke connection position (13) is located in a thickened area of the rim (1).6.The bicycle wheel assembly structure according to claim 1, the tire engagement part (12) is provided with a vent reservation position (121).7.The bicycle wheel assembly structure according to claim 1, the spokes (3) are composite spokes of PBO fiber and carbon fiber, both braided together and thermally cured after soaking in epoxy resin.8.The bicycle wheel assembly structure according to claim 1, the end of the spoke (3) is a connecting end (31), and the diameter of the connecting end (31) is greater than the diameter of the spoke body, forming a wedge-type expansion structure.

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