JPS6171201A - Rim for wheel - Google Patents

Abstract

PURPOSE:To achieve the lightweight, high strength, and low air resistance of th rim for the wheel in a car for a road race by comprising the rim with hybrid materials consisting of fiber reinforced plastic material and light alloy metal material. CONSTITUTION:A nearly heart-shaped rim 1 is formed by being integrated with a hollow light alloy material 4 such as an aluminum alloy and FRP material 5 consisting of high strength and elasticity fiber such as carbon fiber, thermosetting resin such as epoxy resin, and thermoplasic resin such as nylon resin. In this case, the fiber is arranged in the two directions for the longer direction of the rim 1, that is, at 0-20 deg. to reduce the deformation of the rim 1 in the perpendicular direction to the utmost and at 20-70 deg. to reduce the twisting deformation. Moreover, the thickness of the light alloy material 4 is set to approximately 0.2-2 of the thickness of the FRP material 5. As a result of this structure, lightweight, high strength, and low air resistance can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a wheel rim, and more particularly to a rim suitable for bicycles, and furthermore for bicycles used in road races.

Conventional technology rims (for automatic TJTs, motorcycles, bicycles, etc.) are used to form wheels with spoke rough ears, etc.
, Hito (supports the 13 fi3 of 1, and also provides the power to control the driving kayak).

Tokorogu, [1-Trace River Bicycle Jrii-C,
Rim's I ffj is a V1 grade of road racing.
(Gravity 1F) (reducing the weight inside the wheels and thus the weight of the bicycle), making it thinner to reduce air resistance even a little, improving running performance, especially acceleration performance, and increasing the racer's energy. Efforts are being made to reduce consumption.Of course, there is a need for strength and rigidity to withstand the increased loads associated with high-speed driving, especially impacts.

Now, rims are generally made of light alloys such as aluminum alloys, not just for road racing bicycles. This light alloy rim is more durable than other metal rims, and is also relatively strong against sorties. However, since light alloy C is still a metal, it is difficult to significantly reduce its weight.

On the other hand, JP-A-56-122 and JP-A-59-325
Publication No. 03 describes a rim made of so-called 4HI (reinforced plastic (FRP)% I), which is made by reinforcing resin with reinforcing fibers. This FRP rim seems to be H1 lighter than a light alloy rim because FRP has higher specific strength and specific rigidity than metal. However, FRP is not an isotropic material like light alloys, and its properties are determined depending on the direction of the reinforcing fibers, so it has so-called heterogeneous characteristics, so you can make a rim using only FRP. When trying to configure it, side force, that is, cornering force A that acts in a direction perpendicular to the direction of travel when skidding.
-Bending deformation, torsional deformation,
In order to prevent buckling deformation, the wall thickness had to be made considerably thicker, and the width had to be made considerably wider, so it was not as light as expected.

Moreover, as the wall thickness and width become wider, the air resistance increases even more than with the alloy b. In addition, FRP has resistance to rJ
J) FRP rims are inferior to Q properties, so FRP rims are protected against some kind of rain39.
However, it has the disadvantage that it breaks into pieces almost instantaneously when it is subjected to an impact such as a collision or fall. This disadvantage lies in the fact that, unlike competitions that use 1-rack, where you are forced to drive on a flat and well-maintained road surface, you are forced to drive on a undulating and unmaintained road surface. This is fatal as a racing bicycle rim.

Problems to be Solved by the Invention This invention solves the above-mentioned drawbacks of conventional FRP rims,
The objective is to provide a wheel rim that is not only lightweight and strong, but also thin and has low air resistance.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a wheel rim made of a hybrid material of fiber-reinforced plastic material and light alloy material.

To explain one embodiment of the rim of this invention, FIG.
3, the rim 1 is made of a hybrid material of an annular hollow light alloy material 4 and an FRPU 5 disposed so as to be integral with and cover the light alloy material 4, and is approximately It has a heart-shaped cross-sectional shape, and a tire 2 is fitted onto its concave outer surface, so that the surface pressure of the tire 2 is applied to the outer surface. Furthermore, metal eyelets 3 for expanding the spokes are attached to the rim 1 at regular intervals in the longitudinal direction. However, this eyelet is not necessarily necessary.

In item 1, C, the light alloy material is aluminum alloy 15? It is made of a gnesium alloy and side stones that have a particularly high specific strength among eave metals. In addition, "F and P materials include high-strength, high-modulus fibers such as carbon fiber, glass fiber, organic high-modulus fiber (e.g., polyaramid fiber), alumina fiber, and silicon carbide fiber. Reinforce the scale
A-fibers and such reinforcing fibers include thermosetting M resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins, and phenolic resins, as well as nylon resins, polyester resins, polyether sulfone resins, polyolefin resins, and polybutylene terephthalate. It is made by strengthening thermoplastic resin such as resin. In order to minimize deformation of the rim in the vertical direction (vertical direction in FIG.
6. Preferably in a direction of 0 to 5 degrees, and in order to minimize deformation due to twisting, ±20 to 7 degrees in the longitudinal direction.
They are arranged in two directions in the bias direction of 0', lγ, preferably ±30 to 600, more preferably ±40 to 50'. The reinforcing fibers in the bias direction extend continuously in a spiral shape in the longitudinal direction of the rim, as if they were small pieces of light alloy material. However, in this invention, since a hybrid structure with a light alloy material is adopted, reinforcement mN in the bias direction is not necessarily required.

The thickness of the light alloy material is selected to be approximately 0.2 to 2 times the thickness of the FRP material in order to prevent the rim from being deformed, especially by side force, or destroyed during a collision. More preferably, 0,
It is 5 to 1 times. In other words, if it is less than 0.2 times, it is preferable in terms of weight reduction, but there is a tendency for deformation particularly due to side force to become large. Also, 2
If the number exceeds twice as much, the disadvantage of increased weight will be greater than the effect of preventing deformation due to side force.

In the embodiment described above, a hollow rim having a substantially bar-shaped cross-sectional shape has been described, but the cross-sectional shape of the rim can be appropriately selected depending on the application and the like. For example, a cross-sectional shape as shown in FIGS. 2 to 4 may be adopted. The relationship between the gastrointestinal positions of the light alloy material and the FRP material when adopting the lateral inner i-plane shape as shown in Fig. 2 (the relationship is the same as that in Fig. 1 above, and Figs. 3 and 4). When adopting the h-shape shown in Figure 2, normally a light alloy material is placed on the convex side, and an FRP material is placed on the surface where the tire is fitted.

This bright rim can be manufactured by various methods, but is preferably manufactured as follows.

In other words, a rim like 1 shown in Figs. 1 and 2 is made by first forming a hollow pipe made of light alloy with a desired thickness and cross-sectional shape, a ring-shaped light alloy hollow tube with cuts, and reinforcing fibers. The braid structure is preferably the same in structure as a normal braid, but has reinforcing fibers joined to the outer and/or inner surface of the braid along the spiral shape, or Alternatively, a braided tissue body formed into a spiral shape and incorporating reinforcing fibers is used. Next, the hollow tube is covered with a braided tissue body from the cut point a desired number of times, and then placed in a mold, and then a thermosetting resin is injected into the mold and heated under pressure.

At this time, in order to prevent deformation due to pressurization, it is preferable to pressurize the hollow tube by blowing several atmospheres of air into it. After waiting for the thermosetting resin to harden and demolding, the light alloy material and F
Since an annular rim material made of a hybrid material with RP material is obtained, the cuts are joined and eyelets are attached to the rough edges as necessary to form a rim. Instead of the 11 braided cords described above, a prepreg formed by impregnating the braided cord structure with an 8-stage thermosetting resin may be used.

When making rims such as those shown in Figure 3 J3 and Figure 4, an annular light alloy material with the desired thickness and cross-sectional shape and no cuts is used like a mandrel, and the outer periphery is The above braided tissue body is wound a desired number of times, placed in a mold, a thermosetting resin is injected into the mold, the thermosetting resin is cured by applying pressure and heating, the mold is removed, and an eyelet is attached. do. The above braided cord structure may be superimposed on a light alloy material having cuts, and after forming a rim material having cuts, the cuts may be joined. In either case, the braided tissue may be a silipreg.

- In the two methods described above, instead of the braided cord tissue or its prepreg, the reinforcing fiber fabric Yafilamen 1 to
Or you can use those prepregs. Alternatively, a unidirectional silipreg may be used, which is made by impregnating reinforcing fibers aligned in one direction in a sheet shape with B-stage heat-cured ft 1 fill resin.

When using one finger of thermoplastic resin, see Figures 1 and 2.
For products like the one shown in the figure, the same hollow tube as above is covered with 11 Introduction 91 Oriku, etc., placed in a mold, and then thermoplastic resin is press-fitted into the mold to form the product. , Kumihimo■1 The machine body is made of thermoplastic V [a tube made of resin is fitted into a hollow tube, pressure is applied,
Heat it and shape it. The type shown in Figures 3 and 4 is a hot tube with reinforcing fibers in a light alloy material with desired thickness and cross-sectional shape, and with or without cuts. 1. Wrap a plastic sheet or ip, heat 1111 loaves, 111+1, and form.

Both the light alloy material and the FRP material provide the desired strength and stiffness to the rim. In addition, the light alloy material mainly serves to prevent deformation due to side forces and to prevent the rim from breaking into pieces when an impact load is applied. Further, the FRP material mainly has the effect of reducing the weight of the rim.

Effects of the Invention Since the rim of the present invention is made of a hybrid material of light alloy material and FRP44, it is light in weight and has high strength, and is thin and has low air resistance. In other words, because FRP is a highly anisotropic material, conventional FRP rims
In order to prevent bending, twisting, buckling, etc. from occurring even when side forces are applied, the wall thickness must be considerably increased and the width must be considerably wide, making it less Although the eaves cannot be improved, the air resistance due to the thicker and wider rims is increased compared to the rims made of alloy. C was solved by using a light alloy material, which is a flexible material. M [, FR
P is rm. Conventional FRP rims have poor impact resistance, so
In the event of a collision or fall (J), it had the disadvantage that it would break into pieces almost instantaneously, which was also a safety issue, but in this defense, the light alloy, which is relatively resistant to sudden impact, By using the material 17, it is possible to significantly increase the weight <= < fr4 V + striking performance and improve the impact performance.Therefore, the rim of this invention improves acceleration performance and reduces racer's energy consumption. It is particularly suitable for use as a rim for road racing bicycles, which are required to ride on rough terrain.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing the main parts of an embodiment of the wheel rim of the present invention, and FIG. 2 and FIG. FIG. 1: Rim 2: Tire 3, Eyelet 4: Light alloy material

Claims (1)

[Claims] A wheel rim made of a hybrid material of fiber-reinforced plastic and light alloy.