TWI883422B - Thermosetting carbon fiber rim spoke - Google Patents

Abstract

The present invention provides a thermosetting carbon fiber rim spoke, which is characterized in that it comprises a main body and two tubular spoke joints, wherein the two ends of the main body are respectively radially expanded to form two expanding diameter parts, the main body is defined between each expanding diameter parts to form a long section. Each spoke joint surrounds a part of the radial outer circumference of the long section and the radial outer circumference of each expanding diameter parts. The main body is composed of a thermosetting material wrapped with several carbon fiber filaments. Each carbon fiber filament is curled to form two curled sections, and each curled sections is located at each expanding diameter parts, so as to increase the distribution density of each carbon fiber filament in each expanding diameter parts, thereby strengthening each expanding diameter parts.

Description

Thermoset carbon fiber rim spokes

The present invention relates to a wheel rim spoke; in particular, it relates to an innovative structural form of a thermosetting carbon fiber wheel rim spoke.

The wheel rim spokes referred to in the present invention particularly refer to a wheel rim spoke formed by bundling and shaping carbon fibers; because carbon fiber wheel rim spokes have superior properties such as stronger texture, lighter weight, water resistance and corrosion resistance compared to traditional metal wheel rim spokes, they have been widely used in the structure of high-quality bicycle products.

However, there are still some problems and bottlenecks in the current practical application experience of carbon fiber wheel spokes that need to be broken through. For example, because carbon fiber is very hard and brittle, the final product shape must be accurately planned in advance at the initial production mold stage. After the molding and curing, it is almost impossible to change the shape. Therefore, it is known that in terms of assembly positioning and anti-detachment of carbon fiber wheel spokes with the rim structure, some other additional components such as buckles, nails or hoops are usually required. etc., and with secondary processing and auxiliary processes of the mold, or by partial wrapping, curing and reprocessing to remove materials, etc., so as to facilitate the formation of a shape with anti-slip limit function at the end of the carbon fiber wheel rim strip. However, due to the existence of additional components and subsequent processing, the industry process is still too complicated and the material cost is difficult to simplify, which makes it difficult to further reduce the manufacturing cost, thus not meeting the best industrial economic benefits.

The main purpose of this invention is to provide a thermosetting carbon fiber wheel rim spoke. The technical problem it aims to solve is to explore and innovate a new wheel rim spoke that is more ideal and practical.

Based on the above-mentioned purpose, the technical features of the present invention for solving the problem mainly lie in the thermosetting carbon fiber wheel spoke, including a main body and two tubular spoke joints, wherein the main body is a long strip structure extending straight along a virtual axial line to a predetermined length, the two ends of the main body are radially expanded along the axial line to form two expanded diameter parts, the main body defines a long strip section between the expanded diameter parts, each spoke joint is respectively sleeved with each expanded diameter part, and each spoke joint respectively surrounds the long strip section. The radial periphery of a part and the radial periphery of each of the expanded portions, each of the spoke joints is used to connect a circular rim and a hub located at the annular center of the rim; the main body is a thermosetting carbon fiber composite structure formed by a thermosetting resin thermosetting molding wrapping a plurality of carbon fiber filaments gathered into a bundle, each of the carbon fiber filaments is wrapped by the wrapping body, and the two ends of each of the carbon fiber filaments extend to the two ends of the main body; the outer diameter of each of the expanded portions is larger than the outer diameter of the long strip segment, and each of the carbon fiber The filaments are respectively curled to form two curling sections, each of which extends to the two ends of each carbon fiber filament, and each of which is located at each expansion portion, and the length of each curling section is respectively greater than the length of each expansion portion along the axial line, thereby increasing the distribution density of each carbon fiber filament in each expansion portion, thereby strengthening each expansion portion; the two ends of each spoke joint along the axial line are respectively a first end and a second end, the first end is located at one end far away from the long strip segment, and each spoke joint is respectively along the axial line. The axial line forms a first set of holes and a second set of holes, the first set of holes extends to the first end, the second set of holes extends to the second end, the first set of holes and the second set of holes are connected, each of the expansion parts enters the first set of holes of each spoke joint, the long strip section enters the second set of holes of each spoke joint, the inner diameter of each first set of holes matches the outer diameter of each expansion part, the inner diameter of each second set of holes matches the outer diameter of the long strip section, and each spoke joint forms a one-way stop for each expansion part.

The main effect and advantage of the present invention is that the main body forms each of the expanded diameter parts in one piece, and each of the carbon fiber filaments forms the curling section inside each of the expanded diameter parts respectively, so that the strength of the expanded diameter parts to withstand the force can be improved. When each of the spoke joints forms a reverse force along the axial line on the main body, each of the spoke joints and the expanded diameter parts of the ring sleeve are not easy to separate, and there is no need to use other additional components, nor is there any need for secondary processing and auxiliary processes of the mold. The structure can be used to form an assembly anti-detachment function, thereby achieving practical progress and better industrial economic benefits by greatly reducing the material, manufacturing and processing costs of carbon fiber wheel spokes.

3:3-3 Section

4:4-4 Section

10: Subject

12: Wrapping body

14: Carbon fiber

16: Curled section

20: Spoke joint

21: First end

22: Second end

23: The first set of holes

24: Second set of holes

25: Connecting hole

30: Expansion section

40: Long strips

50: Connection section

60: Head start

L1: Axial line

Figure 1 is a three-dimensional diagram of a preferred embodiment of the present invention.

Figure 2 is an axial cross-sectional view of a preferred embodiment of the present invention.

Figure 3 is a partial enlarged view of the section 3-3 of Figure 2, showing the cross section of the coating and carbon fiber along the direction perpendicular to the axial line.

Figure 4 is a partial enlarged view of section 4-4 of Figure 2, showing the cross section of the coating and carbon fiber along the direction perpendicular to the axial line.

Figure 5 is a schematic diagram of the expansion diameter forming process of the preferred embodiment of the present invention (I).

Figure 6 is a schematic diagram of the expansion diameter forming process of the preferred embodiment of the present invention (II).

Please refer to Figures 1 to 4, which are preferred embodiments of the thermosetting carbon fiber wheel rim spokes of the present invention. However, these embodiments are for illustrative purposes only and are not limited to this structure in patent applications.

The preferred embodiment of the thermosetting carbon fiber wheel spoke comprises a main body 10 and two tubular spoke joints 20, wherein the main body 10 is a strip-shaped structure extending straight along a virtual axial line L1 to a predetermined length, and the two ends of the main body 10 along the axial line L1 are radially expanded to form two expanded diameter portions 30, and the main body 10 has a boundary between the expanded diameter portions 30. The elongated strip 40 is formed, each spoke joint 20 is respectively sleeved with each expanded portion 30, and each spoke joint 20 respectively surrounds the radial periphery of a portion of the elongated strip 40 and the radial periphery of each expanded portion 30, and each spoke joint 20 is respectively used to connect a circular rim (not shown) and a hub (not shown) located at the annular center of the rim.

The main body 10 is a thermosetting carbon fiber composite structure formed by a thermosetting resin thermosetting body 12 wrapping a plurality of carbon fiber filaments 14 bundled into a bundle. Each of the carbon fiber filaments 14 is wrapped by the wrapping body 12, and the two ends of each of the carbon fiber filaments 14 extend to the two ends of the main body 10. The thermosetting resin used to form the wrapping body 12 is not particularly limited. For example, the resin The cross-linking reaction caused by heat can be at least partially three-dimensional cross-linking structure. Specific examples of the thermosetting resin include but are not limited to unsaturated polyester resin, vinyl ester resin, vinyl ester resin, epoxy resin, phenol resin, urea resin, melamine resin and polyimide resin, etc. Modified resins of the above specific examples or mixtures of two or more of the above specific examples can also be used.

The outer diameter of each of the expanded portions 30 is larger than the outer diameter of the long strip segment 40, and each of the carbon fiber filaments 14 is curled to form two curled segments 16, each of which extends to the two ends of each of the carbon fiber filaments 14, and each of the curled segments 16 is located at each of the expanded portions 30, and the length of each of the curled segments 16 is larger than the length of each of the expanded portions 30 along the axial line L1, thereby increasing the distribution density of each of the carbon fiber filaments 14 in each of the expanded portions 30, thereby strengthening each of the expanded portions 30.

The two ends of each spoke joint 20 along the axial line L1 are respectively a first end 21 and a second end 22. The first end 21 is located at an end far from the long strip section 40. Each spoke joint 20 forms a first set of holes 23 and a second set of holes 24 along the axial line L1. The first set of holes 23 extends to the first end 21, and the second set of holes 24 extends to the second end 22. The first set of holes 23 and the second set of holes 24 are connected. Each of the expansion portions 30 enters each of the spoke joints 20. The first set of holes 23 of the spoke joint 20, the strip section 40 enters the second set of holes 24 of each spoke joint 20, the inner diameter of each first set of holes 23 matches the outer diameter of each expansion portion 30, the inner diameter of each second set of holes 24 matches the outer diameter of the strip section 40, each spoke joint 20 forms a one-way stop for each expansion portion 30, accordingly, each spoke joint 20 cannot separate from the main body 10 along the axial line L1 in the direction away from the strip section 40.

By means of the above-mentioned structural assembly form and technical features, since each of the carbon fiber filaments 14 forms the curled section 16 in each of the expansion portions 30, and the length of each of the curled sections 16 is respectively greater than the length of each of the expansion portions 30 along the axial line L1, the density of the carbon fiber filaments 14 in each of the expansion portions 30 is significantly increased compared to the long strip section 40, and the carbon fiber filaments 14 in the overall structure of each of the expansion portions 30 is significantly increased. The ratio is higher than that of the long strip section 40, and the strength of each of the expanded diameter portions 30 in bearing the force can be improved compared to the long strip section 40. For the spokes used to support the rim and the wheel hub, the strength of each of the expanded diameter portions 30 is improved, so that when each of the spoke joints 20 forms a reverse force along the axial line L1 on the main body 10, each of the spoke joints 20 and each of the expanded diameter portions 30 of the ring sleeve are not easy to separate.

Furthermore, the main body 10 further includes two connecting sections 50, each connecting section 50 is connected to each of the expansion sections 30 and the strip section 40, and the outer diameter of each connecting section 50 decreases from each of the expansion sections 30 connected to the strip section 40, and the outer diameters of both ends of each connecting section 50 match the outer diameters of each of the expansion sections 30 and the strip section 40 connected to each other, accordingly, the radial periphery of each connecting section 50 is selected to be a cone, and the shape of the radial periphery of each connecting section 50 can also be selected to be replaced by other shapes that gradually expand from one end to the other end.

Each spoke joint 20 forms a connecting hole 25, and the two ends of the connecting hole 25 are connected to the first set of holes 23 and the second set of holes 24, respectively. Each connecting section 50 is respectively fitted and embedded in each connecting hole 25. Each spoke joint 20 surrounds the radial periphery of each connecting section 50, and the hole wall of each connecting hole 25 formed by each spoke joint 20 abuts against each connecting section 50 along the axial line L1.

Specifically, each of the spoke joints 20 is a monolithic component formed in one piece, and each of the spoke joints 20 surrounds the first set of holes 23, the second set of holes 24 and the connecting hole 25 to form a seamless hole wall. It is a better implementation choice to use metal or other materials with good heat resistance for each of the spoke joints 20.

As shown in FIG. 5 and FIG. 6 , each of the expansion portions 30 is formed by placing the two ends of the pre-formed long rod-shaped main body 10 through the second ends 22 into the spoke joints 20, and the two ends of the main body 10 do not protrude from the first ends 21, and it is preferred that the two ends of the main body 10 are aligned with the first ends 21 along the radial direction, and the spoke joints 20 are used as the forming means for forming each of the expansion portions 30. 0, at this time, the thermosetting resin constituting the wrapping body 12 is in an uncured and plastic state, and then the two punches 60 are used to apply pressure to the two ends of the main body 10 along the axial line L1 toward the middle part of the main body 10, forcing the wrapping body 12 to produce axial contraction and radial expansion of the material flow, and each of the first set of holes 23 guides the main body 10 to expand radially to form The flowing wrapping body 12 drives the carbon fiber filaments 14 to curl and deform to form the curling sections 16, and the connecting holes 25 guide the main body 10 to expand radially to form the matching connecting sections 50, and then the main body 10 is heated to the maturing temperature of the thermosetting resin constituting the wrapping body 12, so as to obtain the expansion section 30 and the expansion section 30. The main body 10 of each connecting section 50, the part of the main body 10 that is not formed into each expansion section 30 and each connecting section 50 becomes the long strip section 40; when each punch 60 applies pressure to the two ends of the main body 10, the middle part of the main body 10 can be clamped as needed to prevent the main body 10 from sliding, which is conducive to the radial expansion of the main body 10 to form each expansion section 30.

Alternatively, instead of using each spoke joint 20 as a mold for forming each expanded diameter portion 30, each spoke joint 20 may be sleeved on the pre-formed long rod-shaped main body 10, and each spoke joint 20 may be slid to the middle section of the main body 10, and then both ends of the main body 10 may be placed in corresponding molds (not shown), and after the aforementioned processes of pressing, heating and curing using each punch 60 are performed, the mold may be removed, and each spoke joint 20 may be slid toward both ends of the main body 10 and sleeved on each expanded diameter portion 30, thereby completing the production of the preferred embodiment.

10: Subject

20: Spoke joint

21: First end

22: Second end

23: The first set of holes

30: Expansion section

40: Long strips

L1: Axial line

Claims (5)

A thermosetting carbon fiber wheel spoke, comprising a main body and two tubular spoke joints, wherein the main body is a strip-shaped structure extending straight along a virtual axial line to a predetermined length, the two ends of the main body are radially expanded along the axial line to form two expanded diameter parts, the main body defines a strip section between the expanded diameter parts, each spoke joint is respectively sleeved by the expanded diameter part, and each spoke joint respectively surrounds the radial outer periphery of a part of the strip section and the radial outer periphery of each expanded diameter part, and each spoke joint is respectively used to connect a circular rim and a hub located at the annular center of the rim; The main body is a thermosetting carbon fiber composite structure formed by a thermosetting resin thermosetting body wrapping a plurality of carbon fiber filaments bundled into a bundle. Each of the carbon fiber filaments is wrapped by the wrapping body, and the two ends of each of the carbon fiber filaments extend to the two ends of the main body respectively; The outer diameter of each expanded portion is larger than the outer diameter of the long strip segment, each carbon fiber filament is curled to form two curled segments, each curled segment extends to the two ends of each carbon fiber filament, and each curled segment is located at each expanded portion, and the length of each curled segment is larger than the length of each expanded portion along the axial line, thereby increasing the distribution density of each carbon fiber filament in each expanded portion, thereby strengthening each expanded portion; The two ends of each spoke joint along the axial line are respectively the first end and the second end. The first end is located at one end far from the long strip segment. Each spoke joint forms a first set of holes and a second set of holes along the axial line. The first set of holes extends to the first end, and the second set of holes extends to the second end. The first set of holes and the second set of holes are connected. Each of the expansion parts enters the first set of holes of each spoke joint, and the long strip segment enters the second set of holes of each spoke joint. The inner diameter of each first set of holes matches the outer diameter of each expansion part, and the inner diameter of each second set of holes matches the outer diameter of the long strip segment. Each spoke joint forms a one-way stop for each expansion part. Thermosetting carbon fiber wheel spokes as described in claim 1, wherein the main body further includes two connecting sections, each connecting section is connected to each of the expanded diameter sections and the long strip section, the outer diameter of each connecting section decreases from each of the connected expanded diameter sections toward the long strip section, and the outer diameters of the two ends of each connecting section are matched with the outer diameters of each of the connected expanded diameter sections and the long strip section; Each of the spoke joints forms a connecting hole, the two ends of the connecting hole are connected to the first set of holes and the second set of holes, each of the connecting sections is matched and embedded in each of the connecting holes, and each of the spoke joints surrounds the radial periphery of each of the connecting sections to form a one-way stop. Thermosetting carbon fiber wheel spokes as described in claim 1, wherein each of the expanded diameter portions is formed by material flow when the main body is in a plastic state and compresses the two ends of the main body along the axial line, forcing the coating to produce axial contraction and radial expansion, and the flowing coating causes each of the carbon fiber filaments to curl and deform respectively to form each of the curled sections. As described in claim 3, the thermosetting carbon fiber wheel rim spokes, wherein each of the expanded diameter portions is formed by using each of the spoke joints as a mold, and each of the first sets of holes respectively guides the main body to expand radially to form each of the expanded diameter portions of a matching shape. A thermosetting carbon fiber wheel spoke as described in claim 1, wherein the thermosetting resin is selected from one or a mixture of more than one of unsaturated polyester resin, vinyl ester resin, vinyl ester resin, epoxy resin, phenol resin, urea resin, melamine resin and polyimide resin.

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