JPH0999703A - Wheel for bicycle and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight, reduce influence of a galvanic action, and enrich rigidity by integrally covering/molding a core body composed of a resin foaming body with/by fiber reinforced resin. SOLUTION: A hub installing part 7 is left, and the whole core body 1 of a foaming body is covered with a resin film 20, and doughnut-shaped prepregs 21 and 21 where the hub installing part is cut in a central part are layered on both surfaces. Next, a rim part 3 and a rim part side surface are layered by covering them in a doughnut shape one side by one side in order with doughnut-shaped two prepregs 22 and 23, and it is layered by a single layer only on the rim part 3 over it. Prepregs 24 and 24 are layered on the prepregs 21 and 21. Next, it is set in a mold 4, and a rim-shaped rubber form 5 is brought into contact with the outer periphery of the rim part, and the whole is covered with a nylon film 6, and is deaerated up to forming a vacuum. Next, it is heated, and is pressurized, and reinforced fiber impregnated resin 2 by layering and covering the foaming body 1 is hardened. The nylon film 6 is stripped off, and is taken out of the mold 4, and a fiber reinforced resin-made wheel 1 can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight and highly rigid fiber-reinforced resin bicycle wheel.

[0002]

2. Description of the Related Art Generally, a bicycle wheel is made of metal such as steel, aluminum and aluminum alloy. Wheels made of these metals are heavy, so that weight reduction is desired. In particular, the wheels of competition bicycles are required to be lightweight.

Recently, a fiber reinforced resin (FRP) mainly composed of carbon fiber has appeared. Among them, a wheel called a panel wheel is manufactured by adhering an aluminum honeycomb sandwiched in the center of a fiber reinforced resin plate. Then, the panel is cut out into a circle, and the rim produced in advance is bonded and fixed. However, this structure has a problem that the manufacturing method is complicated instead of the structure, the cost is high, and the material is carbon and aluminum honeycomb, so that it is electrolytically corroded during long-term use.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bicycle wheel made of a fiber-reinforced resin, which is lightweight and has little influence of electrolytic corrosion, and which is rich in rigidity, and an economical manufacturing method thereof.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a bicycle wheel characterized in that a core body made of a resin foam is integrally molded with a fiber reinforced resin.

Further, the present invention is characterized in that a resin foam is used as a core, and the whole is uniformly covered with a resin-impregnated reinforcing fiber, and is pressed and heated in a molding to be integrally molded. In the manufacturing method.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION As the resin foam used in the present invention, a hard foam such as a vinyl chloride resin foam, an acrylic resin foam, a hard urethane resin foam, or a polystyrene foam is used.

Further, as a reinforcing fiber used as a fiber-reinforced resin for covering and integrating the resin foam as a core,
Carbon fiber, aramid fiber, glass fiber, metal fiber and the like are used, but carbon fiber and aramid fiber are preferred.

On the other hand, as the resin used for the fiber reinforced resin, epoxy resin, vinyl ester resin, unsaturated polyester resin and the like are preferably used.

FIG. 1 shows an example of a fiber-reinforced resin wheel of the present invention, in which a core body 1 made of a hard resin foam cut out in a circular shape is uniformly covered and integrally molded with a fiber-reinforced resin. 2 is a partial cross-sectional view taken along the line AA of FIG. 1, and is a drawing for explaining the manufacturing process of the fiber-reinforced resin wheel of the present invention together with the cross-sectional view of the molding process of FIG. Reference numeral 3 is a rim portion.

[0011]

The method for manufacturing the fiber-reinforced resin wheel of the present invention will now be described with reference to the drawings. KREGUECELL TR- # 55, a vinyl chloride resin foam (Kanefuchi Chemical Industry Co., Ltd., trade name, heat resistant temperature 120 ° C., density 0.055
g / cm ³ , thickness 15 mm) was cut into a diameter of 634 mmφ, and a hub mounting portion 7 having a diameter of 200 mmφ was provided at the center.

Carbon fiber cloth TR3110 (elastic modulus 24
t / mm ² carbon fiber TR40 manufactured by Mitsubishi Rayon Co., Ltd.
(Product name) is a plain weave cloth with a density of 12.5 pieces / 25 mm, a weight of 200 g / m ² , and a thickness of 0.27 mm)
Prepreg TR3110 830 impregnated with low temperature curing type epoxy resin # 830 (manufactured by Mitsubishi Rayon Co., Ltd.)
A resin film made of KMP (trade name) and the epoxy resin was prepared.

First, as shown in FIG. 2, the entire foam core 1 is covered with a resin film 20 while leaving the hub mounting portion 7, and the doughnut-shaped prepreg 21 has a diameter of 100 mm and the hub mounting portion is cut at the center. 21 was laminated on both sides. Next, the rim portion 3 and the side surface of the rim portion are sequentially covered in a donut shape by two donut-shaped prepregs 22 and 23 and laminated one by one, and one sheet is laminated only on the rim portion 3 (reference numeral 2).
5) I did. Finally, the prepregs 24 and 24 having a diameter of 636 mmφ (the hub mounting portion was cut) were laminated on the entire surfaces of the prepregs 21 and 21 having a diameter of 100 mmφ with an angle of 45 °.

Next, this was set in a mold 4, and a rim-shaped rubber mold 5 was brought into contact with the outer periphery of the rim portion, the whole was covered with a nylon film 6, and deaeration was performed until a vacuum was obtained. 90 ° C
By heating and pressurizing at a temperature of 1 hour for 1 hour, the reinforced fiber-impregnated resin 2 for laminating and covering the foam 1 was cured. The nylon film 6 was peeled off, taken out from the mold 4, and the rim-shaped rubber mold 5 was removed to obtain a fiber-reinforced resin wheel 1.

This wheel was lighter than the conventional one made of FRP, which is said to have been made lighter in weight, was rich in rigidity, and had good load resistance. In addition, since the resin foam is used for the core portion of the wheel, there is no risk of electrolytic corrosion unlike the conventional one using the aluminum honeycomb.

[0016]

The fiber-reinforced resin bicycle wheel of the present invention is light in weight, rich in rigidity and excellent in load resistance. In addition, there is no effect of electrolytic corrosion. The manufacturing method is an economical manufacturing method with few steps and no post-bonding on the rim.

[Brief description of drawings]

FIG. 1 is a plan view of a wheel of the present invention.

FIG. 2 is a cross-sectional view of a portion corresponding to AA in FIG. 1 for explaining the manufacturing process of the wheel of the present invention.

FIG. 3 is a cross-sectional view for explaining a manufacturing process of the wheel of the present invention.

[Explanation of symbols]

 1 Foamed Resin Core 2 Fiber Reinforced Resin 3 Rim 4 Mold 5 Rim Rubber 6 Nylon Film 7 Hub Mount

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // B29L 31:32

Claims (2)

[Claims] 1. A bicycle wheel comprising a resin foam core integrally molded with a fiber reinforced resin. 2. The bicycle according to claim 1, wherein the resin foam body is used as a core body, the whole is uniformly covered with a resin-impregnated reinforcing fiber, and the molded body is integrally molded by heating under pressure. Wheel manufacturing method.