Natural fiber composite bicycle parts

Abstract

This invention relates to bicycle components made of natural fiber composite materials. A rim for a bicycle wheel includes a radially inner portion arranged along the inner circumference of the rim. The rim also includes a first sidewall, a second sidewall spaced apart from the first sidewall, and a radially outer tire-jointing portion arranged along the outer circumference of the rim. The first sidewall, the second sidewall, the radially outer tire-jointing portion, the radially inner portion, or any combination thereof, comprise a composite laminate. The composite laminate comprises a composite material layer. The composite material comprises a polymer-based matrix and natural fibers as reinforcing materials. The volume of a corresponding natural fiber in the composite material layer is larger before lamination of the composite laminate than the volume of the corresponding natural fiber after lamination.

Description

Technical Field

[0001] This disclosure generally relates to composite material bicycle components, and more specifically, to natural fiber composite material bicycle components. Background Technology

[0002] Traditional bicycle wheels may include rims formed from extruded metal or other materials, which are bent and bonded into a circular shape with a consistent cross-sectional shape. More recently, other materials, such as fiber-reinforced plastics, have been used to manufacture bicycle rims, and these materials can be formed into a circular shape using non-extrusion processes. For example, carbon fiber reinforced plastics can be used.

[0003] Methods for manufacturing fiber-based (e.g., carbon fiber-based) bicycle wheels rely on stacking monolithic carbon fiber materials to form structures such as the sidewalls of a rim. The carbon fiber sheets can be pre-impregnated with resin or other matrix materials, which undergo a curing process to form the rim. The stacked carbon fiber layers typically consist of fibers oriented in different directions. Summary of the Invention

[0004] In one embodiment, a rim for a bicycle wheel includes: a radially inner portion arranged along the inner circumference of the rim; a first sidewall; and a second sidewall spaced apart from the first sidewall. The first and second sidewalls extend radially outward from the radially inner portion. The rim also includes a radially outer tire-engaging portion arranged along the outer circumference of the rim. The radially outer tire-engaging portion extends from the first and second sidewalls, respectively. The first sidewall, the second sidewall, the radially outer tire-engaging portion, the radially inner portion, or any combination thereof, comprise a composite laminate. The composite laminate comprises one or more compressed layers of a composite material having a compressed thickness. The composite material comprises a polymer-based matrix and natural fibers as reinforcing materials.

[0005] In one embodiment, the compression thickness is 75% or less of the original thickness of the one or more compression layers of the composite material in the composite laminate.

[0006] In one embodiment, the reinforcing material has a strength of 24 to 60 GPa / (g / cm²). 3 The specific modulus between ) and below 600 MPa / (g / cm) 3 ) specific strength.

[0007] In one embodiment, the reinforcing material has a cellulose content of more than 40% and a hemicellulose content of more than 4%.

[0008] In one embodiment, the polymer-based material is a thermoplastic, a thermosetting matrix, or a combination thereof. The natural fiber of the reinforcing material is flax fiber, hemp fiber, kenaf fiber, jute fiber, sisal fiber, or any combination thereof.

[0009] In one embodiment, the one or more compression layers of the composite material comprise strips of the composite material.

[0010] In one embodiment, the natural fibers of each strip extend in any direction.

[0011] In one embodiment, the fiber orientation of the natural fibers in each strip is unidirectional along the length of each strip.

[0012] In one embodiment, the composite material is a first composite material, the polymer-based material is a first polymer-based material, and the reinforcing material is a first reinforcing material. The composite laminate includes one or more compressed layers of a second composite material. The second composite material includes a matrix of a second polymer-based material and natural fibers of a second reinforcing material.

[0013] In one embodiment, the second reinforcing material is the same as the first reinforcing material.

[0014] In one embodiment, the one or more compression layers of the first composite material are closer to the surface of the composite laminate than the one or more compression layers of the second composite material.

[0015] In one embodiment, the composite laminate comprises one or more layers of a third composite material, the third composite material comprising a matrix of a third polymer-based material and fibers of a third reinforcing material.

[0016] In one embodiment, the third polymer-based material is a plastic, acrylic acid, resin, epoxy resin, or any combination thereof. The fiber of the third reinforcing material is carbon fiber.

[0017] In one embodiment, the one or more compressed layers of the second composite material are closer to the surface of the composite laminate than the one or more layers of the third composite material.

[0018] In one embodiment, the surface of the composite laminate is the outer surface of the first sidewall.

[0019] In one embodiment, the one or more first compression layers and the one or more second compression layers account for at least 5% of the volume of the composite laminate.

[0020] In one embodiment, the second reinforcing material is woven into the second polymer-based material.

[0021] In one embodiment, a rim for a bicycle wheel includes: a radially inner portion arranged along the inner circumference of the rim; a first sidewall; and a second sidewall spaced apart from the first sidewall. The first and second sidewalls extend radially outward from the radially inner portion. The rim also includes a radially outer tire-engaging portion arranged along the outer circumference of the rim, the radially outer tire-engaging portion extending from the first and second sidewalls, respectively. The first sidewall, the second sidewall, the radially outer tire-engaging portion, the radially inner portion, or any combination thereof, comprise a composite laminate. The composite laminate comprises composite material layers. The composite material comprises a polymer-based matrix and natural fibers of reinforcing material. The volume of a corresponding natural fiber in the composite material layer before lamination in the composite laminate is larger than the volume of the corresponding natural fiber after lamination in the composite laminate.

[0022] In one embodiment, the polymer-based material is a thermoplastic, a thermosetting matrix, or a combination thereof. The natural fiber of the reinforcing material is flax fiber, hemp fiber, kenaf fiber, jute fiber, sisal fiber, or any combination thereof.

[0023] In one embodiment, the first sidewall includes the composite laminate. The first sidewall has an outer surface. The composite material layer forms a portion of the outer surface of the first sidewall.

[0024] In one embodiment, the composite material is a first composite material, the polymer-based material is a first polymer-based material, and the reinforcing material is a first reinforcing material. The composite laminate further includes a second composite material layer. The second composite material includes a matrix of a second polymer-based material and natural fibers of a second reinforcing material.

[0025] In one embodiment, the composite laminate further includes a third composite material layer, the third composite material comprising a matrix of a third polymer-based material and fibers of a third reinforcing material. The third reinforcing material differs from both the first and second reinforcing materials.

[0026] In one embodiment, the second composite material layer is disposed between the first composite material layer and the third composite material layer.

[0027] In one embodiment, a method of manufacturing a bicycle component includes positioning a first composite material layer within a mold. The first composite material comprises a matrix of a first polymer-based material and natural fibers of a first reinforcing material. The method further includes: positioning a second composite material layer within the mold such that the second composite material layer is adjacent to the first composite material layer; and forming the bicycle component. Forming the bicycle component includes forming a composite laminate comprising the first composite material layer and the second composite material layer within the mold. Prior to the formation of the composite laminate, the volume of a corresponding natural fiber in the natural fibers of the first reinforcing material is larger than the volume of the corresponding natural fiber after the formation of the composite laminate.

[0028] In one embodiment, forming the composite laminate includes pressing and curing the first composite material layer and the second composite material layer, autoclaving, or oven curing.

[0029] In one embodiment, forming the composite laminate further includes shaping the composite laminate using a bag.

[0030] In one embodiment, the method further includes positioning a third composite material layer within the mold such that the second composite material layer is disposed between the third composite material layer and the first composite material layer. Forming the composite laminate includes pressing, autoclaving, or oven curing the first, second, and third composite material layers.

[0031] In one embodiment, the first polymer-based material is a thermoplastic, a thermosetting matrix, or a combination thereof, and the fiber of the first reinforcing material is flax fiber, hemp fiber, kenaf fiber, jute fiber, sisal fiber, or any combination thereof. The third polymer-based material is a plastic, acrylic acid, resin, epoxy resin, or any combination thereof, and the fiber of the third reinforcing material is carbon fiber.

[0032] In one embodiment, the bicycle component is a wheel rim.

[0033] In one embodiment, the first composite material layer partially forms the radially outer tire engagement portion of the rim, the radially inner portion of the rim, or the outer surface of the sidewall of the rim.

[0034] In one embodiment, the second composite material is the same as the first composite material. Positioning the second composite material layer within the mold includes positioning the second composite material layer within the mold such that a portion of the second composite material layer overlaps with a portion of the first composite material layer. The first composite material layer and the second composite material layer partially form the outer surface of the bicycle component.

[0035] In one embodiment, the second composite material comprises a matrix of a second polymer-based material and natural fibers of a second reinforcing material. The fiber orientation of the natural fibers of the first reinforcing material in the first composite material layer is unidirectional along the length of the respective layer. The second reinforcing material is woven within the second polymer-based material.

[0036] In one embodiment, the second composite material layer is thicker than the first composite material layer. Attached Figure Description

[0037] The objects, features, and advantages of the present invention will become apparent after reading the following description in conjunction with the accompanying drawings, in which:

[0038] Figure 1 This is a side view of a bicycle that can be constructed using composite material rims;

[0039] Figure 2 It is for bicycles (e.g.) Figure 1 A side view of the wheels of a bicycle;

[0040] Figure 3 This is a cross-sectional view of an uncured composite rim formed from composite material layers;

[0041] Figure 4 This is a chart showing the specific modulus of some natural fibers compared to other materials used in the manufacture of bicycle parts;

[0042] Figure 5 yes Figure 4 Charts showing the specific ultimate strength of some natural fibers and other materials;

[0043] Figure 6 yes Figure 4 Charts showing the density of some natural fibers and other materials;

[0044] Figure 7 It can be used Figure 3 A top view of the first type of stripe of a layup;

[0045] Figure 8 It can be used Figure 3A top view of the second type of stripe in the tile;

[0046] Figure 9 This is a flowchart of one implementation of a method for manufacturing wheel rims;

[0047] Figure 10 The thickness change of the carbon laminate before and after curing is shown;

[0048] Figure 11 The thickness change of the flax laminate before and after curing is shown;

[0049] Figure 12 The additional layers in the strip's layup are shown. Detailed Implementation

[0050] Compared to traditional bicycle rims formed from extruded metal or other materials, composite rims manufactured using existing technologies, such as carbon fiber sheets or strips, offer numerous advantages. For example, carbon fiber-based bicycle rims exhibit higher tensile strength, lower weight, higher temperature resistance, and lower thermal expansion compared to conventional bicycle rims.

[0051] However, the high specific stiffness of carbon fiber composite bicycle components can be detrimental to the rider in certain applications. This can lead to undesirable energy loss from vibrations transmitted from uneven road surfaces through the bicycle components to the rider. This can result in rider fatigue and compensatory movements. Carbon is also an electrical conductor, which can shield wireless signals used by the bicycle's electronic components. Therefore, carbon fiber can act as a Faraday cage to block wireless signals.

[0052] Other non-traditional materials and / or composites can be used for bicycle components. For example, glass fiber composite bicycle components may offer advantageous stiffness characteristics but may come with significant weight and strength penalties. Another example is that conventional wooden bicycle components are unsuitable for construction using thin-walled laminates with multiple fiber orientations. This inability to use multiple fiber orientations in thin-walled sections or portions precludes the manufacture of structures optimized for specific stiffness (such as box sections or portions). As yet another example, wood laminates for bicycle components utilize layers thicker than 1 mm, which limits the number of layers usable for a given component thickness. This limits the directional strength of the bicycle component, as each layer may have fibers in a single principal direction. As yet another example, bamboo tubing for bicycle components suffers from the same disadvantages as wood due to fiber orientation. Bamboo tubing can be used for bicycle components such as frame tubes, but remains suboptimal if the advantages of multiple fiber orientations cannot be utilized. As yet another example, bicycle components made from high-toughness fibers such as polypropylene may be too flexible to support the intended design loads and permissible displacements.

[0053] This disclosure provides embodiments of bicycle components (such as rims and wheels) made of sheet-like low-density cellulose composites, which address or improve upon one or more of the aforementioned disadvantages and / or other disadvantages of bicycle components made of carbon fiber composites or other non-traditional materials. For example, the disclosed rims made of such sheet-like low-density cellulose composites offer superior shock absorption, noise reduction, and greater ductile failure, while maintaining a unique balance between stiffness, weight, and machinability. For example, the disclosed rims can also be non-conductive, allowing wireless signals to pass through.

[0054] Cellulose fibers can have a specific stiffness between high-toughness fibers (such as ultra-high molecular weight polyethylene) and very stiff and high-strength fibers (such as carbon fiber). Cellulose fibers can also have a specific strength lower than that of glass fibers.

[0055] Cellulose fiber composites can be processed into layers thinner than 0.25 mm, allowing them to be processed in the same way as standard composites used in bicycle component manufacturing, and to be customized or tailored for specific load paths. This ability to be processed like carbon fiber composites also means that cellulose fiber composites can be used in blends with carbon and / or other engineering fibers.

[0056] For example, common manufacturing processes used to manufacture carbon fiber composite bicycle parts (such as rims) can also be used to manufacture cellulose fiber composite bicycle parts. Manufacturing processes such as compression molding, autoclave curing, oven curing, and / or resin transfer molding can be used. Cellulose fiber composite bicycle parts can also be molded using materials such as pouches or materials that apply pressure to the laminate due to thermal growth (e.g., silicone resin in a constrained mold).

[0057] Several different laminates (e.g., comprising several layers) and fiber groups can be used for bicycle components. For example, the first laminate may include fibers of a first fiber type (e.g., only one fiber type; hemp), such fibers having a specific modulus of 24 to 60 GPa / (g / cm³). 3 And its specific strength is less than 600 MPa / (g / cm). 3 The second laminate may contain fibers of either the first or second fiber type (such as flax) with a cellulose content greater than 40% of the fiber composition and a hemicellulose content greater than 4% of the fiber composition. The first and second fiber types may be encapsulated in a thermoplastic or thermosetting matrix.

[0058] A third laminate (e.g., comprising carbon fiber and / or other fibers) may be used in conjunction with a first and / or second laminate (e.g., between 5% and 100% by volume) to form a bicycle component. For example, the third laminate may constitute 95% of the volume of a bicycle component. Other laminates and combinations thereof may be provided.

[0059] The disclosed cellulose fiber composite material possesses an advantageous combination of low material density, a suitable range of signal stiffness / strength, and signal transmittance. One advantage of using the disclosed cellulose fiber composite material in bicycle components is that the weight of the bicycle components can be reduced for structures that are not heavily dependent on the tensile strength of specific fibers. Another advantage is the enhanced shock absorption of the bicycle components, thereby reducing energy loss in the motorcycle while improving comfort and control. Other advantages include reduced noise from the bicycle components due to enhanced sound damping and a greater ductile failure response, resulting in fewer catastrophic failures typically associated with carbon composite materials.

[0060] Now turn to the diagram. Figure 1A bicycle 50 employing a rim constructed according to the teachings of this disclosure is generally shown. The bicycle 50 includes: a frame 52; a front wheel 54 and a rear wheel 56, each of which is rotatably attached to the frame 52; and a drivetrain 58. A front brake 60 is provided for braking the front wheel 54, and a rear brake 62 is provided for braking the rear wheel 56. The bicycle 50 generally also has a seat 64 located near the rear end of the frame 52 and mounted on the end of a seatpost 66 connected to the frame 52. The bicycle 50 also has a handlebar 68 near the front end of the frame 52. A brake lever 70 is mounted on the handlebar 68 for actuating the front brake 60, the rear brake 62, or both the front brake 60 and the rear brake 62. If the brake lever 70 actuates only one of the front brake 60 and the rear brake 62, a second brake lever (not shown) may also be provided to actuate the other brake. The front and / or forward riding direction or orientation of the bicycle 50 is determined by... Figure 1 The direction of arrow A in the diagram indicates the direction of travel. Therefore, the forward direction of bicycle 50 is indicated by the direction of arrow A. Although... Figure 1 The bicycle 50 depicted is a road bicycle with drooping handlebars 68, but this disclosure can be applied to any type of bicycle (including mountain bikes with full or partial suspension).

[0061] The drivetrain 58 includes a chain C and a front sprocket assembly 72, which is coaxially mounted with a crank assembly 74 having pedals 76. The drivetrain 58 also includes a rear sprocket assembly 78, which is coaxially mounted with a rear wheel 56; and a rear gear shifting mechanism, such as a rear derailleur 80.

[0062] like Figure 1 As shown, the front sprocket assembly 72 may include one or more coaxially mounted chain links, gears, or sprockets. In this embodiment, the front sprocket assembly 72 has a sprocket F. This sprocket F has teeth 82 around a corresponding circumference. Figure 1As shown, the rear sprocket assembly 78 may include a plurality of coaxially mounted gears, sprockets, or sprockets G. Each sprocket G1 to G11 also has teeth 84 arranged around its respective circumference. The number of teeth 84 on the rear sprockets G1 to G11 can gradually decrease from the rear sprocket G1 with the largest diameter to the sprocket G11 with the smallest diameter. Although not described in detail herein, the front gear changer 85 can be operated to move from a first operating position to a second operating position to move the chain C between the front sprockets F. Similarly, the rear derailleur 80 can be operated to move between different operating positions to switch the chain C to one of the selected rear sprockets G1 to G11. In one embodiment, the rear sprocket assembly 78 may have more or fewer sprockets G. For example, in one embodiment, the rear sprocket assembly 78 may have 12 or 13 sprockets. The size and configuration of the rear derailleur 80 may vary to accommodate the number of sprockets in a particular implementation. For example, the angles and lengths of the linkage mechanism and / or the configuration of the derailleur's cage can be modified to accommodate a specific sprocket combination.

[0063] The rear derailleur 80 is depicted as a wireless, electrically actuated rear derailleur that is mounted or can be mounted to the frame 52 or frame accessory of the bicycle 50. The electric rear derailleur 80 has a base member 86 (e.g., a b-knuckle) mounted to the bicycle frame 52. A linkage mechanism 88 has two links L, which are pivotally connected to the base member 86 at a linkage connection portion of the base member. A movable member 90 (e.g., a p-knuckle) is connected to the linkage mechanism 88 at a linkage connection portion of the movable member. A chain guide assembly 92 (e.g., a cage) is configured to engage the chain and maintain tension in the chain and has one or more cage plates 93, the proximal end of which is pivotally connected to a portion of the movable member 90. The cage plates 93 can rotate or pivot about a cage rotation axis in the damping direction and the chain tension direction. Other gear conversion systems, such as mechanical or hydraulic control and / or actuation systems, can also be used.

[0064] The electric rear derailleur 80 may house a motor module and a battery. The battery supplies power to the motor module. In one embodiment, the motor module is located in a movable member 90. However, the motor module may be located elsewhere, such as in a link L of the linkage mechanism 88, or in the base member 86. The motor module may include a gear mechanism or a transmission. As is known in the art, the motor module and gear mechanism may be coupled to the linkage mechanism 88 to laterally move the retainer plate 93, thereby switching the chain C between the rear sprockets (e.g., G1 to G11) on the rear sprocket assembly 78.

[0065] The cage plate 93 also has a distal end equipped with a tensioning gear or tensioning wheel. This tensioning wheel also has teeth around its circumference. The cage plate 93 is biased in the chain tensioning direction to maintain tension in the chain C. The chain guide assembly 92 may also include a second gear or wheel, such as a guide wheel arranged closer to the proximal end of the cage plate 93 and the movable member 90. In operation, the chain C is positioned around one of the rear sprockets (e.g., G1 to G11). The upper section of the chain C extends forward to the front sprocket assembly 72 and is positioned around a front sprocket F. The lower section of the chain C returns from the front sprocket assembly 72 to the tensioning wheel and then extends forward to the guide wheel. The guide wheel guides the chain C toward the rear sprockets (e.g., G1 to G11). Lateral movement of the cage plate 93, the tensioning wheel, and the guide wheel determines the lateral position of the chain C for alignment with a selected rear sprocket (e.g., G1 to G11).

[0066] Bicycle 50 may include one or more bicycle control devices mounted to handlebars 68. The bicycle control device may include one or more types of bicycle control and / or actuation systems. For example, the bicycle control device may include: a brake actuation system for controlling the front brake 60 and / or the rear brake 62; and / or a shifting system for controlling the drivetrain 58. Other control systems may also be included. For example, in some embodiments, the system may be applied to bicycles using only a front gear shifter or only a rear gear shifter. Additionally, one or more bicycle control devices 100 may also include a suspension control system, a seatpost control system, and / or other control systems for bicycle 50.

[0067] The front wheel 54 and / or rear wheel 56 of the bicycle 50 may include a tire 120, which is attached to the radially outer tire engagement portion of the rim 122. For example... Figure 1 and Figure 2 As shown, multiple spokes 124 are directly attached to the rim 122. Alternatively, the spokes 124 may be attached and / or secured to the rim 122 using other structural components. The spokes 124 extend from the rim 122 and are attached to the central hub 126. The spokes 124 are held under tension between the rim 122 and the central hub 126 to provide operational rigidity for the respective wheels 54, 56 on the bicycle 50. The central hub 126 is configured to be rotatably attached to the bicycle frame 52.

[0068] Figure 2 A bicycle wheel with a rim 122, spokes 124, and a central hub 126 is shown, for example. Figure 1 The front wheel 54 was removed from the rest of the bicycle 50 and was not attached to any tires. Figure 1As shown, the rim 122 includes a tire engagement portion 130 for engaging with a tire 120. The tire engagement portion 130 is disposed radially outside a spoke receiving surface 132 arranged along an inner circumference 134 of the rim 122. In other words, the tire engagement portion 130 is a radially external tire engagement portion. In one embodiment, the tire engagement portion 130 is arranged along an outer circumference 135 of the rim 122. The tire engagement portion 130 is configured to be attached to the tire using a clamp-type tire attachment construction for the tire, including beaded interlocking attachments. Other configurations of the tire engagement portion 130 may also be provided to allow the use of other types of tires on the rim 122. For example, a tubeless tire including a beaded interlocking attachment type may be used.

[0069] The rim 122 has a receiving portion near the spoke receiving surface 132 for attaching the spokes 124 to the rim 122. Accordingly, the spoke receiving surface 132 is part of the spoke engagement portion 136 of the rim 122 (e.g., a radially inner portion). In one embodiment, the spoke engagement portion 136 of the rim 122 is arranged along the inner circumference 134 of the rim 122. In another embodiment, the spoke receiving surface 132 and the spoke engagement portion 136 may be separate components and / or portions of the rim 122. For example, the spokes 124 may pass through the spoke receiving surface 132, and a structure for attachment to the rim 122 may be provided near the tire engagement portion 130.

[0070] The rim 122 includes a first sidewall 138 and a second sidewall extending between a tire engagement portion 130 and a spoke engagement portion 136. For example, the first sidewall 138 and the second sidewall extend radially outward from the spoke engagement portion 136 to the tire engagement portion 130. The first sidewall 138 is spaced apart from the second sidewall.

[0071] At least a portion of the rim 122 (e.g., the first sidewall 138 and the second sidewall) is formed of one or more composite materials. In one embodiment, the entire rim 122 is formed of one or more composite materials. In one embodiment, natural fiber reinforced plastic forms a monolithic single rim composed of an assembly of natural fiber layers, the rim including a tire-joint portion 130, a first sidewall 138, a second sidewall, and a spoke-joint portion 136. Other configurations may also be provided. For example, a combination of natural fiber reinforced plastic and carbon fiber reinforced plastic forms a monolithic single rim composed of an assembly of natural fiber layers and carbon fiber layers, the rim including a tire-joint portion 130, a first sidewall 138, a second sidewall, and a spoke-joint portion 136. Other configurations may also be provided.

[0072] The front wheel 54 and the rear wheel 56 may include rims 122 configured for wheels of any size. In one embodiment, the rims 122 are configured for wheels conforming to the 700C (e.g., 622 mm diameter clamp and / or ISCO 622 mm) bicycle wheel standard.

[0073] The front wheel 54 and the rear wheel 56 can rotate in either direction around the central hub 126. For example, as Figure 2 As shown, the front wheel 54 and the rear wheel 56 can be configured to rotate about the central hub 126 in a specific direction of rotation. In another embodiment, the front wheel 54 and the rear wheel 56 can be configured to rotate in a direction opposite to the specific direction of rotation.

[0074] In one embodiment, the bicycle 50 has a front wheel 54 and / or a rear wheel 56 (e.g., Figure 1 In the embodiments, the first sidewall 138, second sidewall, spoke joint portion 136, and tire joint portion 130 of the front wheel 54 and rear wheel 56 are at least partially formed of one or more layers (e.g., composite material layers) of one or more composite materials. Each of the one or more layers may include one or more fabric sheets (e.g., sheets) of the corresponding composite material. Different layers of different composite materials may each include different numbers of composite material sheets or sheets. At least some composite material layers may be of different shapes and / or sizes. Alternatively, all composite material layers may be of the same shape and / or size.

[0075] In one embodiment, at least some of the composite material layers are in the shape of strips. For example, strips of one or more composite materials may form the first sidewall 138 and the second sidewall of the front wheel 54. Strips of one or more composite materials may be arranged around the central hub 126 of the front wheel 54 and the central hub 126 of the rear wheel 56, respectively, to form the first sidewall 138 and the second sidewall of the front wheel 54 and the rear wheel 56, respectively.

[0076] During manufacturing, the layers of the front wheel 54 and the rear wheel 56 are respectively integrated with the spoke joint portion 136 and the tire joint portion 130 of the respective wheels 54 and 56 (e.g., forming composite material layers for the spoke joint portion 136 and the tire joint portion 130) through a curing process, thereby forming a one-piece single rim 122. The rims 122 of the front wheel 54 and the rear wheel 56 can be formed using other manufacturing processes.

[0077] Figure 3One embodiment of a layup pattern for composite material layers (e.g., first layer 150, second layer 152, and third layer 154) used for rim 122 prior to the curing process is shown. For example, after the curing process, the first layer 150, second layer 152, and third layer 154 can become part of a one-piece single rim 122. The resulting one-piece single rim 122 can be formed from a composite laminate comprising one or more compressed layers of one or more composite materials. Any number of composite materials can be included in the composite laminate. For example, the one or more composite materials in the composite laminate can include a first composite material, a second composite material, a third composite material, or any combination thereof. The composite laminate can include more or fewer composite materials. For example, the composite laminate can include only the first composite material or only the second composite material.

[0078] The first composite material may include a matrix of a first polymer-based material and natural fibers of a first reinforcing material. In one embodiment, the first reinforcing material has a strength of 24 and a strength of 60 GPa / (g / cm). 3 The specific modulus between ) and below 600 MPa / (g / cm) 3 The specific strength of the first reinforcing material. Alternatively or additionally, the cellulose content of the first reinforcing material may be higher than 40%, and the hemicellulose content may be higher than 4%. The first polymer-based material may be any number of materials, including, for example, thermoplastics, thermosetting matrices, another polymer-based material, or any combination thereof, and the natural fibers of the first reinforcing material may be any number of materials, including, for example, flax fibers, kenaf fibers, hemp fibers, jute fibers, sisal fibers, one or more other natural fibers, or any combination thereof.

[0079] refer to Figures 4 to 6 Some natural fibers offer a combination of low material density (e.g., compared to glass fiber) and a sufficiently wide range of specific stiffness for various types of bicycle components, such as rims, cranks, handlebars, seat tubes, seatposts, seat rails, shift levers, brake levers, derailleur cages, and suspension fork components. For example, flax has a density of less than 1.5 g / cm³. 3 (For example, with glass fiber greater than 2.5 g / cm) 3 Compared to its density, its specific modulus is 43 GPa / (g / cm³). 3 (For example, with glass fiber 28GPa / (g / cm) 3 Compared to ), the specific strength is 500 MPa / (g / cm). 3 (For example, with glass fiber 1,390 MPa / (g / cm) 3 (Compared to) As another example, the density of cannabis is less than 1.5 g / cm³. 3The specific modulus is 30 GPa / (g / cm³). 3 And its ultimate tensile strength is 372 MPa / (g / cm). 3 As another example, the density of sisal is less than 1.5 g / cm³. 3 The specific modulus is 25 GPa / (g / cm³). 3 And its ultimate tensile strength is 521 MPa / (g / cm). 3 Other natural fibers can be used. Compared to composites used in existing technologies (such as glass fiber), the combination of cellulose structures, with their unique specific stiffness, specific modulus, and processability properties, provides vibration damping, noise reduction, and greater ductility. Low-density cellulose composites (such as flax fiber composites) are non-conductive, allowing electrical signals to pass through the composite material without acting as a Faraday cage that blocks signals, unlike carbon fiber composites.

[0080] The first layer 150 can be made of a first composite material. Figure 7 One embodiment of a first composite material layer 150 in the shape of strips is shown. The first composite material comprises a matrix 166 of a polymer-based material (e.g., a first polymer-based material) and fibers 168 of a reinforcing material (e.g., a first reinforcing material). In one embodiment, the first polymer-based material is, for example, a thermoplastic or thermosetting plastic. In one embodiment, the fibers of the first reinforcing material are, for example, flax fibers. Other polymer-based materials and / or other reinforcing fibers may be used.

[0081] Fibers 168 extend along a finite length L of strip 150. In one embodiment, fibers 168 extend in the primary strength direction of strip 150 (e.g., along the length L of strip 150). For example, strip 150 has a unidirectional fiber orientation along length L. In another embodiment, some fibers 168 do not extend in the primary strength direction (e.g., less than 20% of the fibers, less than 10% of the fibers, or less than 5% of the fibers). Strip 150 can be any number of shapes and / or sizes. For example, strip 150 is rectangular. Other shapes may also be provided, such as square strips and non-rectangular parallelogram strips. Strip 150 also includes a width W that is perpendicular to the length L. The length L may be defined by, for example, the dimensions of the tire engagement portion 130 of rim 122, the first sidewall 138, the second sidewall, and / or the spoke engagement portion 136. In other words, the length L can be at least as high or as wide as the tire engagement portion 130, the first sidewall 138, the second sidewall, and / or the spoke engagement portion 136 of the rim 122. In one embodiment, the width W of the strip 150 is between 10 mm and 50 mm. For example, the width W of the strip 150 is 30 mm. In other embodiments, the strip 150 is wider or narrower (e.g., 60 mm). A smaller strip width can better optimize fiber orientation, but at the cost of increased manufacturing complexity. In one embodiment, the width W of the strip 150 is the same as the radial width of the rim 122.

[0082] Layers 150 of different shapes, greater widths, and / or greater lengths can be used. For example, at least some of the composite layers may extend a quarter, half, or all of the way around the rim (e.g., as support within the well of the rim 122). Composite layers of different sizes and / or shapes may be used depending on the application within the rim (e.g., forming an outer surface, providing strength and stiffness at high-load locations within the rim).

[0083] The first composite layer 150 can have any number of thicknesses. For example, the thickness of the first composite layer 150 can be 0.4 mm or less (e.g., 0.25 mm or less). Other thicknesses of the first composite layer 150 can be provided.

[0084] For example, layer 150 provides ultimate strength in the direction of the fiber grain. Therefore, fiber alignment relative to the inner diameter of rim 122 can be configured to increase the strength of rim 122. The width W of layer 150 is a variable that maximizes fiber alignment relative to a specified orientation. The farther the fiber is from the center CEN of rim 122, the greater the change in the fiber's angle relative to the rim tangent, which reduces the fiber's ability to support stress and load.

[0085] The second composite material may include a matrix of a second polymer-based material and natural fibers of a second reinforcing material. In one embodiment, the second reinforcing material has a strength of 24 to 60 GPa / (g / cm²). 3 ) specific modulus and below 600 MPa / (g / cm) 3 The specific strength of the second reinforcing material is [not specified]. Additionally, the cellulose content of the second reinforcing material can be higher than 40%, and the hemicellulose content can be higher than 4%. The second polymer-based material can be any number of materials, including, for example, resins, epoxy resins, or combinations thereof, and the natural fibers of the reinforcing material can be any number of materials, including, for example, flax fibers, kenaf fibers, hemp fibers, jute fibers, sisal fibers, one or more other natural fibers, or any combination thereof. In one embodiment, the second reinforcing material is the same as the first reinforcing material (e.g., flax).

[0086] The second layer 152 can be made of a second composite material. Figure 8 An embodiment of a second composite material layer 152 formed as strips is shown. The second composite material comprises a matrix 170 of a polymer-based material (e.g., a second polymer-based material) and fibers 172 of a reinforcing material (e.g., a second reinforcing material). In one embodiment, the second polymer-based material is a resin, and the fibers of the second reinforcing material are flax fibers.

[0087] Fibers 172 are woven within the polymer-based material matrix 170 of the strip 152. Therefore, at least some fibers 172 are angled relative to other fibers 172. For example, at least some fibers 172 form a lattice pattern. In one embodiment, at least some fibers 172 extend along the length L of the strip 152. For example, less than 20%, less than 10%, or less than 5% of the fibers 172 extend along the length L of the strip 152. In another embodiment, the fibers 172 of the strip 152 can be oriented in any direction. When flax is used as a low-density filler, the fiber orientation may be less important. The fibers may not be oriented in the primary direction of the strip. In another alternative embodiment, the fibers may be aligned with a load path different from the strip orientation.

[0088] The strip 152 can be of any number of shapes and / or sizes. For example, the strip 152 may be rectangular. Other shapes may be provided, such as square strips and non-rectangular parallelogram strips. The strip 152 also includes a width W that is perpendicular to the length L. The length L may be defined by, for example, the dimensions of the tire engagement portion 130, the first sidewall 138, the second sidewall, and / or the spoke engagement portion 136 of the rim 122. In other words, the length L may be at least as high or as wide as the tire engagement portion 130, the first sidewall 138, the second sidewall, and / or the spoke engagement portion 136 of the rim 122. In one embodiment, the width W of the strip 152 is between 10 mm and 50 mm. For example, the width W of the strip 152 is 30 mm. In other embodiments, the strip 152 may be wider or narrower (e.g., 60 mm). In one embodiment, the width W of the strip 152 is the same as the radial width of the rim 122.

[0089] Layers 152 of different shapes, greater widths, and / or greater lengths can be used. For example, at least some layers 152 of the second composite material may extend a quarter, half, or all of the way around the rim (e.g., as support within the well of the rim 122). Layers 152 of different sizes and / or shapes of the second composite material may be used depending on the application within the rim (e.g., providing thickness and stiffness at high-load locations within the rim 122).

[0090] The second composite layer 152 can have any number of thicknesses. In one embodiment, layer 152 comprises a plurality of material sheets and is thicker than the first composite layer 150. Each of the plurality of material sheets of layer 152 can be unidirectional and can be stacked and stitched together to form a lattice or hash pattern. In other words, at least some of the plurality of material sheets of layer 152 are unidirectional in different directions. For example, the thickness of the second composite layer 152 can be 1.2 mm or more. Other thicknesses of the second composite layer 152 can be provided.

[0091] The third layer 154 may be made of a third composite material. In one embodiment, the third composite material layer 154 is in the shape of a strip. The third strip 154 ​​may be similar to... Figure 7 The first composite material shown is a strip 150. For example, the third composite material also includes a matrix of a polymer-based material (such as a third polymer-based material) and fibers of a reinforcing material (such as a third reinforcing material). The third polymer-based material can be any number of materials, including, for example, plastics, acrylics, resins, epoxy resins, or any combination thereof, and the fibers of the third reinforcing material can be any number of materials, including, for example, carbon. Other polymer-based materials and / or other reinforcing fibers may be used.

[0092] Compared to the first and second reinforcing materials, the third reinforcing material can be denser and can have a higher specific modulus and specific ultimate strength. For example, the density of carbon is greater than 2.5 g / cm³. 3 However, its specific modulus is 162 GPa / (g / cm³). 3 It has a specific strength of 2,952 MPa / (g / cm²). 3 Although carbon is heavier than the first and second reinforcing materials, carbon and / or other denser but stronger reinforcing materials can be used in small amounts to reinforce specific areas of the rim (e.g., the spoke joint portion 136 of the rim 122).

[0093] picture Figure 7 Similar to fiber 168 shown, the fibers of the third reinforcing material can extend along a finite length of strip 154. In one embodiment, the fibers extend in the primary strength direction of strip 154. For example, strip 154 ​​has a unidirectional fiber orientation along its length. In another embodiment, some fibers of the third reinforcing material do not extend in the primary strength direction (e.g., less than 20%, less than 10%, or less than 5%). Strip 154 ​​can be any number of shapes and / or sizes. For example, strip 154 ​​is rectangular. Other shapes can be provided, such as square strips and non-rectangular parallelogram strips. Strip 154 ​​also includes a width W that is perpendicular to the length L. Width W can be defined by, for example, the dimensions of the spoke engagement portion 136 of rim 122. In one embodiment, the width W of strip 154 ​​is between 10 mm and 50 mm. For example, the width W of strip 154 ​​is 30 mm. In other embodiments, strip 154 ​​is wider or narrower. The strip 154 ​​of the third composite material can have any amount of thickness.

[0094] Layers 154 of different shapes, greater widths, and / or greater lengths may be used. For example, at least some layers 154 of the third composite material may extend a quarter, half, or all of the way around the rim 122 (e.g., as support within the well of the rim 122). Layers 154 of different sizes and / or shapes of the third composite material may be used depending on the application within the rim (e.g., providing strength and stiffness at high load locations within the rim).

[0095] refer to Figure 3 The radially outer tire engagement portion 130 includes a first tire holding portion 200 and a second tire holding portion 202, the second tire holding portion 202 being spaced apart from the first tire holding portion 200. The first tire holding portion 200 extends from a first sidewall 138, and the second tire holding portion 202 extends from a second sidewall 204. The first sidewall 138 and the second sidewall 204 extend radially inward from the radially outer tire engagement portion 130.

[0096] The first tire retaining portion 200 includes a first tire retaining wall 206. In one embodiment, the first tire retaining portion 200 also includes a first protrusion (e.g., a first tire retaining feature) (not shown). The first protrusion may extend away from the first tire retaining wall 206. The first protrusion may be of any number of shapes, including, for example, a shape having a rectangular cross-section with a semi-circular cap. The first protrusion may extend circumferentially around the rim 122.

[0097] The second tire retaining portion 202 includes a second tire retaining wall 208. The second tire retaining wall 208 is opposite to and spaced apart from the first tire retaining wall 206. In one embodiment, the second tire retaining portion 202 also includes a second protrusion (e.g., a second tire retaining feature) (not shown). The second protrusion may extend away from the second tire retaining wall 208 toward the first tire retaining portion 200. The second protrusion may be of any number of shapes, including, for example, a shape having a rectangular cross-section with a semi-circular cap. The second protrusion may extend circumferentially around the rim 122. The first and second protrusions may be of other shapes.

[0098] Rim 122 can accommodate tire 120 (see Figure 2 The tire, for example, is a tubeless caliper tire. Tire 120 includes a bead that interacts with radially outer tire engagement portions 130 of the rim 122 (e.g., a first tire holding portion 200 and a second tire holding portion 202) to attach tire 120 to and retain tire 120 on the rim 122. The bead may include any amount of material (e.g., steel wire or aramid fiber (e.g., Kevlar)). TM (fiber) to prevent tire 120 from moving off rim 122. Due to the use of steel wire or Kevlar TM Fiber reinforcement, such as the bead, can resist the stretching caused by internal air pressure. Alternatively, the bead may be made of the same material as tire 120 (e.g., rubber).

[0099] The radially outer tire engagement portion 130 also includes a well 210 positioned between a first tire retaining portion 200 and a second tire retaining portion 202 on the rim 122. The well 210 provides a volume in which the bead of the tire 120 can be placed when the tire 120 is attached to the rim 122. When the tire 120 is inflated, the bead of the tire 120 moves away from each other until the bead interacts with the first tire retaining portion 200 and the second tire retaining portion 202, respectively. When inflated, the bead of the tire 120 abuts against a first tire retaining wall 206 and a second tire retaining wall 208, respectively. In one embodiment, the first and second tire retaining features, for example, retain the bead of the tire 120 within the radially outer tire engagement portion 130 (e.g., retain the bead of the tire 120 in engagement with the first tire retaining wall 206 and the second tire retaining wall 208), thereby preventing the tire 120 from detaching from the rim 122. The contact between the tire bead and the first tire retaining wall 206 and the second tire retaining wall 208 respectively forms a seal between the inflated tire 120 and the rim 122.

[0100] The radially outer tire engagement portion 130 may further include ridges (e.g., bead protrusions; first bead protrusion and second bead protrusion) located on opposite sides of the well 210. A first support beam 214 (e.g., a first bead support beam) extends away from a first tire retaining wall 206 (e.g., between the first tire retaining wall 206 and the first bead protrusion), and a second support beam 216 (e.g., a second bead support beam) extends away from a second tire retaining wall 208 (e.g., between the second tire retaining wall 208 and the second bead protrusion). In one embodiment, a curved transition region 218 extends between the first support beam 214 and the first tire retaining wall 206, and between the second support beam 216 and the second tire retaining wall 208, respectively. The bead protrusions may be positioned on opposite sides of the well 210 and may protrude relative to the first support beam 214 and the second support beam 216, respectively. If the tire 120 loses pressure, the bead protrusions can help retain the tire 120 on the rim 122.

[0101] like Figure 3 As shown in the embodiments, the first layer 150 may form the outer surface of the spoke receiving surface 132, the outer surface of the first sidewall 138, the outer surface of the second sidewall 204, and the outer surface of the radially outer tire engagement portion 130 (e.g., the first tire holding portion 200, the second tire holding portion 202, the well 210, the first support beam 214, the second support beam 216, and the bending transition region 218). In other embodiments, the first layer 150 forms fewer outer surfaces than all of these outer surfaces of the rim 122.

[0102] For example, a first layer 150a may be positioned to form a spoke receiving surface 132 (e.g., a spoke receiving first layer), a first layer 150b may overlap with the spoke receiving first layer 150a to form the outer surface of a first sidewall 138 (e.g., a first sidewall first layer), and a first layer 150c may overlap with the spoke receiving first layer 150a to form the outer surface of a second sidewall 204 (e.g., a second sidewall first layer). First layers 150d and 150e may overlap at the outer tire engagement portion 130 to form, for example, the outer surfaces of a first tire retaining wall 206, a second tire retaining wall 208, a well 210, a first support beam 214, a second support beam 216, and a bending transition region 218 (e.g., a tire engagement first layer).

[0103] The lengths of the first layers 150a to 150e may extend radially and / or circumferentially relative to the rim 122. In one embodiment, the lengths of the first layers 150a to 150e extend around the entire circumference of the ply of the rim 122. In other words, the ply pattern of the rim 122 includes only one of the first layers 150a to 150e. In other embodiments, not all of the first layers 150a to 150e extend around the entire circumference of the ply of the rim 122.

[0104] In another embodiment, at least some lengths of the first layers 150a to 150e extend less than the length of the entire circumference of the pavement around the rim 122. For example, some or all of the lengths of the first layers 150a to 150e may extend by one-sixteenth, one-eighth, one-quarter, or half the circumference of the pavement around the rim 122, respectively. In other words, this portion of the pavement pattern may repeat (e.g., overlap) around the rim 122. For example, the first layer 150b of the first sidewall may overlap with the adjacent first layer 150b of the first sidewall by 0.5 inches, and the first layer 150c of the second sidewall may overlap with the adjacent first layer 150c of the second sidewall by 0.5 inches. More or less overlap may be provided. Other lengths of the first layers 150a to 150e may be provided.

[0105] The thin first layer 150 forming the outer surface of the rim 122 allows the load to be distributed over more fibers and allows the fiber orientation to be customized along a specific load path. Due to the unidirectional nature of the first layer 150, it is also more aesthetically pleasing than the second layer 152.

[0106] The second layer 152 may be included within the layup pattern to provide thickness at a lower cost compared to using only the first layer 150 (e.g., a thin unidirectional layer), and thus provide stiffness. In one embodiment, the second layer 152 does not form any outer surface of the rim 122 (e.g., except for the outermost portions of the first tire retaining wall 206 and the second tire retaining wall 208, respectively). For example, the second layer 152a partially forms the spoke engagement portion 136 (e.g., the spokes engage the second layer) and the inner surface of the first layer 150a is adjacent to the spokes.

[0107] The length of the second layer 152a may extend circumferentially relative to the rim 122. Alternatively, the length of the second layer 152a may extend radially relative to the rim 122. In one embodiment, the length of the second layer 152a extends around the entire circumference of the ply pattern of the rim 122. In other words, the ply pattern of the rim 122 includes only one second layer 152a.

[0108] In another embodiment, the length of the second layer 152a is less than the length of the entire circumference of the ply around the rim 122. For example, the length of the second layer 152a may be one-sixteenth, one-eighth, one-quarter, or half the circumference of the ply around the rim 122. In other words, for at least some of the layers 150, 152, 154, the ply pattern may be repeated (e.g., overlapped) around the rim 122. More or fewer second layers 152a may be provided within the ply pattern.

[0109] Second layers 152b and 152c overlap each other (e.g., a butterfly-shaped second layer) and partially form the spoke joint portion 136, the first sidewall 138, and the second sidewall 204. Second layer 152b overlaps with the butterfly-shaped second layer 152c, the spoke receiving first layer 150a, and the first sidewall first layer 150b. Second layer 152c overlaps with the spoke joint second layer 152a, the spoke receiving first layer 150a, and the second sidewall first layer 150c.

[0110] The lengths of the second layers 152b and 152c may extend circumferentially relative to the rim 122. Alternatively, the lengths of the second layers 152b and 152c may extend radially relative to the rim 122. In one embodiment, the lengths of the second layers 152b and 152c extend around the entire circumference of the ply pattern of the rim 122. In other words, this portion of the ply pattern of the rim 122 includes only one of the second layers 152b and 152c.

[0111] In another embodiment, the lengths of the second layers 152b and 152c are respectively less than the length of the entire circumference of the ply around the rim 122. For example, the lengths of the second layers 152b and 152c may be one-sixteenth, one-eighth, one-quarter, or half the circumference of the ply around the rim 122, respectively. In other words, this portion of the ply pattern may be repeated (e.g., overlapped) around the rim 122. More or fewer second layers 152b and 152c may be provided within the ply pattern.

[0112] The second layer 152d (e.g., a supporting second layer) partially forms the radially outer tire engagement portion 130 (e.g., the inner portion of the first support beam 214, the second support beam 216, and the well 210), the first sidewall 138, and the second sidewall 204. The supporting second layer 152d overlaps with the butterfly-shaped second layers 152b and 152c at opposite ends of the tire engagement second layer 152d, and overlaps with the first layer 150k (e.g., a supporting first layer) arranged within the radially outer tire engagement portion 130.

[0113] The lengths of the second layer 152d and the first layer 150k may extend circumferentially relative to the rim 122. Alternatively, the lengths of the second layer 152d and the first layer 150k may extend radially and / or across the rim 122, respectively. In one embodiment, the lengths of the second layer 152d and the first layer 150k extend around the entire circumference of the ply of the rim 122. In other words, the ply pattern of the rim 122 includes only one of the second layer 152d and one of the first layer 150k.

[0114] In another embodiment, the lengths of the second layer 152d and the first layer 150k are respectively less than the length of the entire circumference of the ply around the rim 122. For example, the lengths of the second layer 152d and the first layer 150k may be one-sixteenth, one-eighth, one-quarter, or half the circumference of the ply around the rim 122, respectively. In other words, this portion of the ply pattern may be repeated (e.g., overlapped) around the rim 122. More or fewer second layers 152d and / or first layers 150k may be provided within the ply pattern.

[0115] Second layers 152e and 152f (e.g., tire-jointing second layers) partially form radially outer tire-jointing portions 130 (e.g., the outer portions of the first support beam 214, the second support beam 216, and the well 210) and overlap each other at the well 210. The tire-jointing second layers 152e and 152f may be staggered with the tire-jointing first layers 150d and 150e. For example, the tire-jointing second layer 152e may be adjacent to the tire-jointing first layer 150d, and the tire-jointing second layer 152f may be adjacent to the tire-jointing first layer 150e. A portion of the tire-jointing second layer 152e may be disposed between the tire-jointing first layers 150d and 150e, and a portion of the tire-jointing second layer 152f may be disposed between the tire-jointing first layer 150e and the supporting first layer 150k.

[0116] The lengths of the second layers 152e and 152f may extend circumferentially relative to the rim 122. Alternatively, the lengths of the second layers 152e and 152f may extend radially and / or across the rim 122, respectively. In one embodiment, the lengths of the second layers 152e and 152f extend around the entire circumference of the ply pattern of the rim 122. In other words, the ply pattern of the rim 122 includes only one of the second layers 152e and 152f.

[0117] In another embodiment, the lengths of the second layers 152e and 152f are respectively less than the length of the entire circumference of the ply around the rim 122. For example, the lengths of the second layers 152e and 152f may be one-sixteenth, one-eighth, one-quarter, or half the circumference of the ply around the rim 122, respectively. In other words, this portion of the ply pattern may be repeated (e.g., overlapped) around the rim 122. More or fewer second layers 152e and / or 152f may be provided within the ply pattern.

[0118] Second layers 152g and 152h (e.g., tire-holding second layers) partially form the first tire-holding portion 200 and the second tire-holding portion 202, respectively. The layup pattern may include any number of tire-holding second layers 152g and 152h. For example, the layup pattern may include stacks of tire-holding second layers 152g that partially form the first tire-holding portion 200 (e.g., two or more tire-holding second layers 152g) and stacks of tire-holding second layers 152h that partially form the second tire-holding portion 202 (e.g., two or more tire-holding second layers 152h). In one embodiment, the layup pattern includes only a single tire-holding second layer 152g and a single tire-holding second layer 152h. The tire-holding second layer 152g is disposed between the first sidewall first layer 150b and the tire-engaging first layer 150e, and the tire-holding second layer 152h is disposed between the second sidewall first layer 150c and the tire-engaging first layer 150d.

[0119] The lengths of the second layers 152g and 152h can extend circumferentially relative to the rim 122. Alternatively, the lengths of the second layers 152g and 152h can extend radially relative to the rim 122. In one embodiment, the lengths of the second layers 152g and 152h extend around the entire circumference of the ply pattern of the rim 122. In other words, the ply pattern of the rim 122 includes only one second layer 152g and one second layer 152h.

[0120] In another embodiment, the lengths of the second layers 152g and 152h are respectively less than the length of the entire circumference of the ply around the rim 122. For example, the lengths of the second layers 152g and 152h may be one-sixteenth, one-eighth, one-quarter, or half the circumference of the ply around the rim 122, respectively. In other words, this portion of the ply pattern may be repeated (e.g., overlapped) around the rim 122. More or fewer second layers 152g and 152h may be provided within the ply pattern.

[0121] Second layers 152i and 152j (e.g., elbow-shaped second layers) partially form the first tire retaining portion 200 and the first support beam 214, as well as the second tire retaining portion 202 and the second support beam 216, respectively. The layup pattern may include any number of elbow-shaped second layers 152i and 152j. For example, the layup pattern may include stacks of elbow-shaped second layers 152i that partially form the first tire retaining portion 200 and the first support beam 214 (e.g., two or more elbow-shaped second layers 152i) and stacks of elbow-shaped second layers 152j that partially form the second tire retaining portion 202 and the second support beam 216 (e.g., two or more elbow-shaped second layers 152j). In one embodiment, the layup pattern includes only a single elbow-shaped second layer 152i and a single elbow-shaped second layer 152j.

[0122] An elbow-shaped second layer 152i is disposed between the first sidewall first layer 150b and the tire-engaging first layer 150e, and a tire-holding second layer 152j is disposed between the second sidewall first layer 150c and the tire-engaging first layer 150d. In one embodiment, the elbow-shaped second layer 152i is bent such that a first portion of the elbow-shaped second layer 152i is disposed between the tire-holding second layer 152g and the first sidewall first layer 150b, and a second portion of the elbow-shaped second layer 152i is disposed between the tire-engaging second layer 152f and the supporting first layer 150k. Accordingly, the elbow-shaped second layer 152j can be bent such that a first portion of the elbow-shaped second layer 152j is disposed between the tire-holding second layer 152h and the second sidewall first layer 150c, and a second portion of the elbow-shaped second layer 152j is disposed between the tire-engaging second layer 152e and the supporting first layer 150k.

[0123] The lengths of the second layers 152i and 152j may extend circumferentially relative to the rim 122. Alternatively, the lengths of the second layers 152i and 152j may extend radially and / or across the rim 122, respectively. In one embodiment, the lengths of the second layers 152i and 152j extend around the entire circumference of the tile pattern of the rim 122. In other words, the tile pattern of the rim 122 includes only one of the second layers 152i and 152j.

[0124] In another embodiment, the lengths of the second layers 152i and 152j are respectively less than the length of the entire circumference of the ply around the rim 122. For example, the lengths of the second layers 152i and 152j may be one-sixteenth, one-eighth, one-quarter, or half the circumference of the ply around the rim 122, respectively. In other words, this portion of the ply pattern may be repeated (e.g., overlapped) around the rim 122. More or fewer second layers 152i and 152j may be provided within the ply pattern.

[0125] A third layer 154 may be included within the layup pattern to provide stiffness and strength at specific locations on the rim 122. For example, the third layer 154 may be included in the layup at the spoke joint portion 136. In other embodiments, the third layer 154 may be additionally or alternatively located at different locations on the rim 122 (e.g., within well 210). Reference Figure 3 In the embodiment shown, the layup pattern includes a third layer 154a (e.g., a supporting third layer) that forms the inner surface of the spoke joint portion 136. The third layer 154a is adjacent to one of the butterfly-shaped second layers 152b and 152c (e.g., butterfly-shaped second layer 152b).

[0126] The length of the third layer 154a may extend circumferentially relative to the rim 122. Alternatively, the length of the third layer 154a may extend radially relative to the rim 122. In one embodiment, the length of the third layer 154a extends around the entire circumference of the ply pattern of the rim 122. In other words, the ply pattern of the rim 122 includes only one third layer 154a.

[0127] In another embodiment, the length of the third layer 154a is less than the length of the entire circumference of the pavement around the rim 122. For example, the length of the third layer 154a may be one-sixteenth, one-eighth, one-quarter, or half the circumference of the pavement around the rim 122, respectively. In other words, this portion of the pavement pattern may be repeated (e.g., overlapped) around the rim 122. Therefore, the pavement pattern of the rim 122 may include, for example, sixteen, eight, four, or two third layers 154a. More or fewer second layers 152a may be provided within the pavement pattern.

[0128] Other ply patterns can be provided. For example, a ply pattern may include more or fewer layer types. In one embodiment, the ply pattern includes only a first layer 150 or a second layer 152. In another embodiment, the ply pattern includes two types of layers selected from the first layer 150, the second layer 152, and the third layer 154. For example, the ply pattern may include only the first layer 150 and the third layer 154, or only the second layer 152 and the third layer 154. Other layer types can be provided. For example, the ply pattern may include a layer made of glass fiber, either in place of the third layer 154 or as a supplement to the third layer 154.

[0129] compared to Figure 3As shown, other numbers, shapes, sizes, and orientations of layers can be provided. For example, a layup pattern may include more butterfly-shaped second layers 152b and 152c, more supporting second layers 152d for forming a stack of supporting second layers 152d, more tire-engaging second layers 152e and 152f, more tire-holding second layers 152g and 152h within a respective stack, more elbow-shaped second layers 152i and 152j within a respective stack, or any combination thereof. As another embodiment, the layup pattern may include more supporting first layers 150k. As yet another embodiment, the layup pattern may not include any supporting second layers 152d. Other configurations of the layup pattern can be provided.

[0130] For example, prior to the curing process, the shape of the ply pattern of the first sidewall 138 and the second sidewall 204 of the rim 122 is circular, and the ply pattern of the rim 122 has any number of cross sections (e.g., such as...). Figure 3 (As shown in the diagram). A first layer 150, a second layer 152, a third layer 154, additional material layers (e.g., composite materials), or any combination thereof are arranged centrally around the inner circumference of the ply pattern defined by a first radius and the outer circumference of the ply pattern defined by a second radius. The inner and outer circumferences of the ply pattern may, for example, define the inner circumference 134 and the outer circumference 135 of the rim 122, respectively. For example, the ply pattern may include any number of layers 150, 152, and 154. The number of the first layer 150, the second layer 152, and the third layer 154 depends, for example, on the size and / or shape of the respective layers 150, 152, and 154 and / or the size of the rim 122.

[0131] The ply pattern of the first sidewall 138 may be the same as that of the second sidewall 204. Alternatively, the ply pattern of the first sidewall 138 may be different from that of the second sidewall 204. The different ply patterns of the first sidewall 138 and the second sidewall 204 may be due to the axial geometry of the cassette gap. For example, the spokes 124 on one side of the front wheel 54 and the rear wheel 56 may be under higher tension and / or may approach the spoke engagement portion 136 of the rim 122 at different angles compared to the spokes 124 on the other side of the front wheel 54 and the rear wheel 56. In one embodiment, at least some layers of the first sidewall 138 are made of a different material than at least some layers of the second sidewall 204. Other ply pattern combinations may be provided for the first sidewall 138 and the second sidewall 204, respectively.

[0132] The ply pattern of the first sidewall 138 and the second sidewall 204 of the rim 122 of the front wheel 54 may be the same as the ply pattern of the first sidewall 138 and the second sidewall 204 of the rim 122 of the rear wheel 56. Alternatively, the ply patterns of the front wheel 54 and the rear wheel 56 may be different.

[0133] The layup pattern of the first sidewall 138 and / or the second sidewall 204 of the front wheel 54 and / or the rear wheel 56 can be optimized for specific applications. For example, carbon composite layers (e.g., the third layer 154) can be positioned within the layup of the corresponding sidewall of the rim based on whether a sidewall is included in the front or rear wheel, whether the rim is subjected to wheel braking or rim braking, and / or whether the wheel uses a tangential or radial lace construction. The layup pattern can be optimized for additional and / or different applications.

[0134] Figure 9 A method 900 for manufacturing bicycle components (e.g., rim 122) for a bicycle (e.g., bicycle 50) is shown. The actions of method 900 described below are to be interpreted as illustrative. In some embodiments, method 900 may be performed without one or more additional actions not described, and / or without one or more discussed actions. Furthermore, Figure 9 The order of actions of the method 900 shown and described below is not intended to be limiting.

[0135] In action 902, at least one layer of a first composite material is positioned within a mold. The first composite material comprises a matrix of a first polymer-based material and natural fibers of a first reinforcing material. In one embodiment, the fiber orientation of the natural fibers of the first reinforcing material in the first composite material layer is unidirectional along the length of the respective layer. The first composite material layer can be of any number of shapes and / or sizes. For example, the first composite material layer can be rectangular in shape, and its length can be at least as high as the sidewall of the rim to be manufactured. Other shapes and / or sizes may be provided.

[0136] The first polymer-based material may be or includes any number of polymer-based materials, including, for example, thermoplastics, thermosetting matrices, or combinations thereof. The fibers of the first reinforcing material may be or include any number of different types of natural fibers, including, for example, flax fibers, kenaf fibers, hemp fibers, jute fibers, sisal fibers, or any combination thereof. Other polymer-based materials and / or other reinforcing materials may be used in the first composite material.

[0137] In action 904, at least one layer of the second composite material is positioned within the mold, such that the second composite material layer is adjacent to the first composite material layer. The second composite material comprises a matrix of a second polymer-based material and natural fibers of a second reinforcing material. In one embodiment, the second reinforcing material is woven into the matrix of the second polymer-based material. The second composite material layer can be of any number of shapes and / or sizes. For example, the second composite material layer can be rectangular in shape, and its length can be at least as high as the sidewall of the rim to be manufactured. Other shapes and / or sizes can be provided. In one embodiment, the second composite material layer is thicker than the first composite material layer.

[0138] The second polymer-based material may be or includes any number of polymer-based materials, including, for example, thermoplastics, thermosetting matrices, or combinations thereof. The fibers of the second reinforcing material may be or include any number of different types of natural fibers, including, for example, flax fibers, kenaf fibers, hemp fibers, jute fibers, sisal fibers, or any combination thereof. Other polymer-based materials and / or other reinforcing materials may be used in the second composite material.

[0139] In other embodiments, additional, fewer, and / or different composite material layers may be positioned within the mold. For example, a third composite material layer may be positioned within the mold such that a second composite material layer is disposed between the third composite material layer and the first composite material layer.

[0140] The third composite material comprises a matrix of a third polymer-based material and natural fibers of a third reinforcing material. The third polymer-based material can be or includes any number of polymer-based materials, including, for example, plastics, acrylics, resins, epoxy resins, or any combination thereof. The fibers of the third reinforcing material can be or include any number of fibers of different types, including, for example, carbon fibers. Other polymer-based materials and / or other reinforcing materials may be used in the third composite material.

[0141] In another embodiment, method 900 does not include action 904, and action 902 is repeated several times. In other words, only the first composite material layer(s) is positioned within the mold. Alternatively, method 900 does not include action 902, and action 904 is repeated several times. In other words, only the second composite material layer(s) is positioned within the mold. Other combinations of these layers may be provided.

[0142] Actions 902 and 904 can be repeated any number of times to form a layup pattern for the bicycle components. When actions 902 and 904 are repeated, each layer of the second composite material does not necessarily need to be adjacent to a layer of the first composite material (e.g., the tire holds the second layers 152g and 152h). In one embodiment, actions 902 and 904 can be repeated any number of times to create... Figure 3 The layup pattern shown is another layup pattern. In one embodiment, actions 902 and 904 may be repeated with one or more additional actions, wherein one or more layers of another composite material (e.g., a third composite material) are positioned any number of times to, for example, form a layup pattern (e.g., Figure 3 (The tile pattern shown).

[0143] For example, a first composite material layer may first be positioned within a mold (action 902) such that the first composite material layer is adjacent to one or more surfaces of the mold. The first composite material layer adjacent to one or more surfaces of the mold ultimately forms one or more outer surfaces (e.g., outer surfaces) of the composite laminate of the bicycle component formed by method 900. For example, the first composite material layer may at least partially form the outer surface of the spoke receiving surface (e.g., spoke receiving surface 132), the outer surface of the first sidewall (e.g., first sidewall 138), the outer surface of the second sidewall (e.g., second sidewall 204), and the outer surface of the radially outer tire engagement portion (e.g., radially outer tire engagement portion 130).

[0144] The first composite material layer can be positioned within the mold to overlap with one or more other layers of the first composite material. For example, as Figure 3 As shown in the embodiments, the first composite material layer that partially forms the first sidewall and the first composite material layer that partially forms the second sidewall can overlap with the first composite material layer that partially forms the spoke receiving surface, respectively. Other overlaps can also be provided. For example, the first composite material layers can be positioned around the layup such that portions of adjacent layers of the first composite material (e.g., in the circumferential direction) partially overlap each other.

[0145] After the first composite material layer is positioned within the mold in action 902, the second composite material layer can be positioned within the mold (e.g., action 904). Therefore, the second composite material layer can be separated from one or more surfaces of the mold at least by means of the first composite material layer (e.g., in action 902). The second composite material layer ultimately forms the thickness and / or inner surface of the composite laminate of the bicycle component formed by method 900. Therefore, the second composite material layer can be further from the outer surface of the composite laminate than at least some layers of the first composite material. In one embodiment, one or more layers of the second composite material can be positioned within the mold between the positions of the first composite material layers (e.g., as shown in the image). Figure 3 As shown, the tire-bonding second layers 152e and 152f are interleaved with the tire-bonding first layers 150d and 150e.

[0146] The second composite material layer can be positioned within the mold to overlap with one or more other layers of the second composite material. For example, as Figure 3As shown in the embodiments, the second composite material layer that partially forms the first sidewall and the second composite material layer that partially forms the second sidewall can overlap each other and can overlap with the second composite material layer that partially forms the radially outer tire engagement portion. Other overlaps can be provided. For example, the second composite material layers can be positioned around the layup such that portions of adjacent second composite material layers (e.g., in the circumferential direction) overlap each other.

[0147] In one embodiment, after the second composite layer is positioned within the mold in action 904, a third composite layer can be positioned within the mold. Therefore, the third composite layer can be separated from one or more surfaces of the mold at least by means of the first composite layer (e.g., in action 902) and / or the second composite layer (e.g., in action 904). The third composite layer can provide strength and stiffness and ultimately form one or more inner surfaces of the composite laminate of the bicycle component formed by method 900. Therefore, the third composite layer can be further from the outer surface of the composite laminate than at least some of the first and second composite layers.

[0148] The third composite layer can be positioned within the mold to overlap with one or more other third composite layers. For example, the third composite layer can be positioned around the layup such that portions of adjacent third composite layers overlap each other (e.g., in the circumferential direction).

[0149] In action 906, a bicycle component is formed. Forming the bicycle component includes forming a composite laminate (e.g., a laminate) that includes at least a first composite material layer and a second composite material layer within a mold. In one embodiment, forming the bicycle component includes forming a composite laminate that includes at least a first composite material layer, a second composite material layer, and a third composite material layer within a mold.

[0150] The composite laminate can be provided in any quantity of components. For example, the first composite material and the second composite material may constitute at least 5% of the composite laminate by volume. For example, in one embodiment, the composite laminate may be 95% carbon composite material and 5% first composite material by volume. In another embodiment, the composite laminate may be 95% first composite material and / or second composite material and 5% carbon composite material by volume. In yet another embodiment, the first composite material and / or second composite material constitute 100% of the composite laminate by volume.

[0151] In one embodiment, the layup pattern of the rim may include a third composite material layer (e.g., carbon fiber composite) to form, for example, a first sidewall, a second sidewall, a spoke joint portion, and a portion of the tire joint portion; the first composite material layer and / or the second composite material layer may be positioned within the tire holding portion of the tire joint portion (e.g., a first tire holding portion 200 and a second tire holding portion 202) to provide thickness (e.g., as tire holding second layers 152g and 152h and / or elbow-shaped second layers 152i and 152j) using a lower-density material, and thus to provide stiffness. In other words, the first composite material layer and / or the second composite material layer may act as a lower-density filler.

[0152] The mold can be used to form all or part of a bicycle component. For example, for a rim, the mold can be broken down into multiple parts so that it can be accessed when positioning at least a first material layer in action 902 and when positioning a second material layer in action 904. For example, the mold can be broken down into multiple circumferential portions (e.g., four circumferential portions) and / or multiple pieces (e.g., a first sidewall piece, a second sidewall piece, and a radially outer piece).

[0153] Forming a composite laminate can include shaping and curing the composite laminate, for example, within a mold. For instance, at least a first composite layer and a second composite layer can be positioned within the mold and shaped using a bladder inflated within the mold. The composite laminate can be shaped in other ways.

[0154] Once formed, the composite laminate can be cured in any manner, including, for example, by compression curing, autoclave curing, or oven curing of the composite laminate comprising at least a first composite layer and a second composite layer. Other types of curing may also be used.

[0155] This method 900 can be used to manufacture any number of different bicycle parts. For example, in addition to bicycle rims, this method 900 can be used to manufacture cranks, handlebars, seat tubes, seatposts, seat rails, shift levers, brake levers, derailleur retainers, suspension fork components, and / or other bicycle parts.

[0156] After action 906, the volume of a corresponding natural fiber in the first reinforcing material is smaller than the volume of that corresponding natural fiber in the first reinforcing material before the formation of the composite laminate in action 906. Therefore, the formed composite laminate may include at least one or more compressed layers of a first composite material, one or more compressed layers of a second composite material, and one or more layers of a third composite material. In other embodiments, the formed composite laminate may include more, fewer, and / or different compressed composite material layers.

[0157] refer to Figure 10 For example, the thickness of a carbon laminate (e.g., consisting only of a third composite material) changes very little after curing. Figure 10 As shown, the diameter of the carbon filaments 1002 in the carbon laminate remains consistent after curing and is not compacted. (Reference) Figure 11 ,and Figure 10 Compared to the carbon laminates shown, the thickness of natural fiber laminates (such as flax laminates; including only the first composite material) varies more significantly after curing. The core 1102 of the natural fibers in the natural fiber laminate (such as the flax laminate) is compressed under pressure, causing the natural fibers to collapse, resulting in a collapsed core 1104. In other words, the volume of a corresponding natural fiber in the natural fiber laminate before curing (e.g., lamination) is larger than the volume of a corresponding natural fiber after lamination in the composite laminate. Therefore, the thickness change Δt of the flax laminate after curing is greater. f Much greater than the thickness change Δt of the cured carbon laminate c .

[0158] The number of composite material layers (e.g., first composite material, second composite material, and third composite material) can vary throughout the formed component. For example, a first portion of the radially outer tire engagement portion (e.g., first tire retaining wall 206) may include more layers of second composite material than a second portion of the radially outer tire engagement portion (e.g., well 210). Furthermore, a spoke engagement portion (e.g., spoke engagement portion 136) may include more composite material layers (e.g., first composite material layer, second composite material layer, and third composite material layer) than a first or second sidewall may include. Other variations in layer number and / or thickness may be provided (see [link to documentation]). Figure 3 ).

[0159] Because the number of composite material layers varies throughout the molded part, for example, the thickness changes before and after curing will also differ. The layup of composite material layers (e.g., see...) Figure 3 The thickness variation after curing can be taken into account. In other words, to account for this variation, the uncompacted layup will be thicker. In one embodiment, the compressed thickness of the composite laminate is 75% or less of the original thickness of the uncompacted laminate. The composite laminate may be 75% or less of the original thickness of the entire formed bicycle part (e.g., the first sidewall, the second sidewall, the radially outer tire joint portion, and the spoke joint portion), or this thickness variation may only apply to certain portions of the bicycle part (e.g., the first and second sidewalls). For example, the thickness of the layup for a portion of the first sidewall of a bicycle rim may be 5 mm, while the thickness of the first sidewall of the bicycle rim after curing may be 3 mm.

[0160] In one embodiment, an environmentally stable material layer or outer sheet may be added to the exterior and / or outermost layer of the laminate. Since natural fibers may be absorbent or hygroscopic, this layer or material can serve as a moisture barrier.

[0161] exist Figure 12 An embodiment of this moisture barrier can be seen in the image. Figure 12 A laminate 1200 is shown, having layers of material forming part of a bicycle rim, derailleur guard, or any other part of a bicycle. The laminate 1200 includes barrier layers 1202. In this embodiment, two moisture barrier layers 1202 made of a moisture-resistant material are present (located at the top and bottom of the laminate 1200). Between the moisture barrier layers 1202 are any number of natural fiber layers 1204. The moisture barrier layers 1202 can be thin layers of glass fiber, polyester fiber, carbon, or any other hydrophilic material. This material is coated with epoxy resin and acts as a carrier for the environmental resin during curing, thereby holding the resin on the surface of the laminate 1200 so that the resin can become a molding surface protectant. Without the moisture barrier layers 1202, the resin would permeate into the natural fiber layers 1204 during curing.

[0162] In the process of forming the laminate 1200, the moisture barrier layer 1202 can be added as a separate final layer. Alternatively, the moisture-proof material can be added directly to the final layer of the natural fiber material to form the moisture barrier layer 1202.

[0163] The moisture barrier layer 1202 can be a woven material, a non-woven material, or any other form that accepts resin. During the curing process, the moisture barrier layer 1202 holds the resin in place on the surface of the bicycle component.

[0164] Moisture barrier layer 1202 can be used on any bicycle component made of natural fibers. Moisture barrier layer 1202 can be used on all inner and outer surfaces and on any surface that may be exposed to moisture.

[0165] The illustrations of the embodiments described herein are intended to provide a general understanding of the structure of various embodiments. These illustrations are not intended as a complete description of all elements and features of devices and systems utilizing the structures or methods described herein. Those skilled in the art will likely discover many other embodiments upon reviewing this disclosure. Other embodiments may be utilized and derived from this disclosure, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure. Furthermore, the illustrations are merely representative and may not be drawn to scale. Some scales in the illustrations may be exaggerated, while others may be minimized. Therefore, this disclosure and the illustrations should be considered illustrative rather than restrictive.

[0166] While this specification contains numerous specific details, these details should not be construed as limiting the scope of the invention or any claims that may be made, but rather as descriptions of specific features of particular embodiments of the invention. Certain features described in this specification within the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, individual features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments. Furthermore, although features may be described above as functioning in certain combinations, and even initially claimed in this way, in some cases one or more features may be removed from a claimed combination, and a claimed combination may involve sub-combinations or variations thereof.

[0167] Similarly, although operations and / or actions are depicted in the accompanying drawings and described herein in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or sequentially, or to perform all described operations to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of various system components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that any described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

[0168] One or more embodiments of this disclosure may be referred to herein individually and / or collectively as the "invention," merely for convenience and not intended to voluntarily limit the scope of this application to any particular invention or inventive concept. Furthermore, although specific embodiments have been illustrated and described herein, it should be understood that any subsequent arrangements aimed at achieving the same or similar purpose may supersede the specific embodiments shown. This disclosure is intended to cover any and all subsequent modifications or variations of the various embodiments. Combinations of the above embodiments, as well as other embodiments not specifically described herein, will be apparent to those skilled in the art upon review of this specification.

[0169] This abstract is provided to comply with 37 C. FR § 1.72(b) and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Furthermore, in the foregoing detailed description, various features may be combined together or described in a single embodiment for the purpose of simplifying this disclosure. This disclosure should not be construed as reflecting an intention that the claimed embodiments require more features than expressly recited in each claim. Rather, as reflected in the appended claims, the inventive subject matter may involve fewer features than any of the disclosed embodiments. Therefore, the appended claims are incorporated into the detailed description, each claim existing independently as defining its own claim.

[0170] The above detailed description should be considered illustrative rather than restrictive, and the appended claims are understood to include all equivalents in order to define the scope of the invention. The claims should not be construed as limiting to the order or elements described unless stated otherwise. Therefore, all embodiments within the scope and spirit of the appended claims and their equivalents are claimed as part of the invention.

Claims

1. A rim for a bicycle wheel, the rim comprising: A radially inner portion, which is arranged along the inner circumference of the rim; First sidewall; A second sidewall spaced apart from the first sidewall, wherein the first sidewall and the second sidewall extend radially outward from the radially inner portion; as well as A radially outer tire engagement portion is arranged along the outer circumference of the rim, the radially outer tire engagement portion extending from the first sidewall and the second sidewall, respectively. Wherein, the first sidewall, the second sidewall, the radially outer tire engagement portion, the radially inner portion, or any combination thereof, comprise a composite laminate, the composite laminate comprising one or more compression layers of a composite material having a compression thickness, the composite material comprising a polymer-based matrix and natural fibers as reinforcing materials, and The reinforcing material has a strength of 24 to 60 GPa / (g / cm). 3 The specific modulus between ) and below 600 MPa / (g / cm) 3 ) specific strength.

2. The wheel rim according to claim 1, wherein, The compressed thickness is 75% or less of the original thickness of one or more compressed layers of the composite material in the composite laminate.

3. The wheel rim according to claim 1, wherein, The reinforcing material has a cellulose content of more than 40% and a hemicellulose content of more than 4%.

4. The wheel rim according to claim 3, wherein, The one or more compression layers of the composite material include strips of the composite material.

5. The wheel rim according to claim 4, wherein, The fiber orientation of the natural fibers in each strip is unidirectional along the length of each strip.

6. The wheel rim according to claim 1, wherein, The composite material is a first composite material, the polymer-based material is a first polymer-based material, and the reinforcing material is a first reinforcing material. The composite laminate includes one or more compressed layers of a second composite material, wherein the second composite material includes a matrix of a second polymer-based material and natural fibers of a second reinforcing material.

7. The wheel rim according to claim 6, wherein, The one or more compression layers of the first composite material are closer to the surface of the composite laminate than the one or more compression layers of the second composite material.

8. The rim according to claim 6, wherein, The composite laminate comprises one or more layers of a third composite material, the third composite material comprising a matrix of a third polymer-based material and fibers of a third reinforcing material.

9. The rim according to claim 8, wherein, The third polymer-based material is plastic, acrylic acid, resin, epoxy resin, or any combination thereof, and The fiber in the third reinforcing material is carbon fiber.

10. The rim according to claim 9, wherein, The one or more compressed layers of the second composite material are closer to the surface of the composite laminate than the one or more layers of the third composite material.

11. The rim according to claim 6, wherein, The second reinforcing material is woven into the second polymer-based material.

12. A method for manufacturing a bicycle component, the method comprising: The first composite material layer is positioned inside the mold, the first composite material comprising a matrix of a first polymer-based material and natural fibers of a first reinforcing material; Position the second composite material layer inside the mold such that the second composite material layer is adjacent to the first composite material layer; Forming the bicycle component includes forming a composite laminate comprising a first composite material layer and a second composite material layer within the mold. Wherein, prior to the formation of the composite laminate, the volume of a corresponding natural fiber in the first reinforcing material is larger than the volume of the corresponding natural fiber after the formation of the composite laminate, and The first reinforcing material has a strength of 24 to 60 GPa / (g / cm). 3 The specific modulus between ) and below 600 MPa / (g / cm) 3 ) specific strength.

13. The method according to claim 12, wherein, Forming the composite laminate includes pressing and curing the first composite material layer and the second composite material layer, autoclaving, or oven curing.

14. The method according to claim 13, wherein, Forming the composite laminate further includes shaping the composite laminate using a bag.

15. The method of claim 12, further comprising positioning a third composite material layer within the mold such that the second composite material layer is disposed between the third composite material layer and the first composite material layer, and in, Forming the composite laminate includes pressing, autoclaving, or oven curing the first composite material layer, the second composite material layer, and the third composite material layer.

16. The method according to claim 12, wherein, The bicycle component is a rim, and wherein the first composite material layer partially forms the radially outer tire engagement portion of the rim, the radially inner portion of the rim, or the outer surface of the sidewall of the rim.

17. The method according to claim 12, wherein, The second composite material is the same as the first composite material, and Positioning the second composite material layer within the mold includes positioning the second composite material layer within the mold such that a portion of the second composite material layer overlaps with a portion of the first composite material layer, and the first composite material layer and the second composite material layer partially form the outer surface of the bicycle component.

18. The method according to claim 12, wherein, The second composite material comprises a matrix of a second polymer-based material and natural fibers of a second reinforcing material. Wherein, the fiber orientation of the natural fibers of the first reinforcing material of the first composite material layer is unidirectional along the length of each layer, and The second reinforcing material is woven into the second polymer-based material.

19. The method according to claim 18, wherein, The second composite material layer is thicker than the first composite material layer.

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