JPH0342301A - Wire-spoke wheel for automobile - Google Patents

Abstract

PURPOSE:To enable light weight and mass production and reduce the cost by forming a rim out of an inner rim made of light alloy connected to a hub disc with wire spoke and an outer rim made of fiber reinforced plastics integratedly molded with the inner rim. CONSTITUTION:A wheel 20 is composed of a hub disc 21 made of light alloy or the like, an inner rim 23 made of light alloy fitted to the hub disc with wire spoke 22 made of stainless steel or the like, and an outer rim 24 made of fiber reinforced plastics integratedly molded with the inner rim 23. In this case, at first the hub disc 21 is fitted on the center part of the inner rim 23 with the wire spoke 22, hereafter the outer rim 24 is integratedly molded with the inner rim 23 assembled with the hub disc 21. Hereby, the weight of a rim is lightened, and improvement for mass productivity and cost down are attained by reducing the part to be cutting-worked and molding in one body as the above-stated through injection molding or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire spoke wheel for an automobile in which a rim and a hub disk disposed at the center of the rim are assembled using a plurality of wire spokes.

[Prior art]

Generally, the rim of this type of wheel is manufactured using one of the following processing methods: embossing, casting, or forging.

For example, the embossed bottom type rim IA shown in FIG.
The material flat plate 2 of the light alloy type shown in FIG. 13 is roll-formed to form a material 3 having a cross-sectional shape as shown in FIG. As shown in FIG.
Manufactured by drilling.

Further, the casting type rim IB shown in FIG. 17 is made by molding a material 6 with a cross-sectional shape as shown in FIG. 16 by casting.
After cutting out the hot water lower and runner 8 and finishing the part 6 shown by the broken line in FIG. 17, the nipple engaging hole 9 is
Manufactured by drilling.

Furthermore, the forged type rim IC shown in FIG.
A raw material 11 having a cross-sectional shape as shown in FIG. 19 is formed by forging using a two-part die from the raw material round bar 10 shown in the figure, and a second half 13 having no flange portion 12 is processed by spinning. The flange portion 14 and the like are formed as shown by the dotted line in the figure, and then the part 15 shown by the dotted line in FIG. 20 is finished by cutting, and then the nipple retaining hole 16 is bored.

cProblems to be Solved by the Present Invention] In the emboss molding type rim l shown in FIG.
Furthermore, the thickness tz of the seat portion 4 becomes thinner than the plate thickness t1 due to a wall sink during embossing. Therefore, the thickness to of the flat plate 2 must be increased so that the seat portion 4 has sufficient strength, resulting in increased costs.

In addition, the cast type rim IB shown in FIG. 17 requires an outer mold having a complicated multi-segment structure in order to form undercut-shaped parts such as the well part 17 and the flange part 12.14. Processing steps such as cutting out the lower part and the runner 8 and cutting the outer circumferential surface of the formed material 6 are required, which increases the cost. In addition, due to the lack of toughness due to the characteristics of cast products, the flange portion 12.14
There is a risk of air leakage due to casting defects such as pinholes and cavities. In order to prevent this, it is necessary to use a thicker structure, which inevitably increases the weight of the product.

In the forged type rim tc shown in Fig. 20, it is not possible to form the undercut-shaped parts such as the well part 17 and the flange part 12.
After forging the material 13 having the cross-sectional shape shown in the figure, the flange portion 14 and the rim bead seat portion 1 are formed by spinning.
It is necessary to mold 8. Furthermore, there are many processing steps, such as cutting off the forging ridge 19 and cutting the partial work 5 shown by dotted lines in FIG. 20 in order to obtain a precisely finished surface, resulting in high costs.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a wire spoke wheel for an automobile that can reduce cost and weight.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a wire spoke wheel for an automobile in which a hub disk is assembled to the center of a rim by a plurality of wire spokes, and the rim is connected to the hub disk by the wire spokes. It is characterized by consisting of a light alloy inner rim and a fiber-reinforced plastic outer rim integrally molded with the inner rim.

[Action and effect of the invention]

According to the present invention, since the rim is composed of an inner rim made of light alloy and an outer rim made of fiber-reinforced plastic, it is possible to reduce the weight of the rim, reduce the number of parts that require cutting, and use injection molding or compression molding. Since the outer rim can be integrally molded with the inner rim, mass production is improved and costs can be reduced.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.
1 and 2 show a wire spoke wheel for an automobile according to an embodiment of the present invention. The wheel 2
0 consists of a light alloy hub disc 21, a light alloy inner rim 23 assembled to the disc 21 with stainless steel wire spokes 22, and a fiber-reinforced plastic outer rim 24 integrally molded with the inner rim 23. It is configured.

The inner rim 23 is made by forging a ring-shaped material 25 having a cross-sectional shape as shown in FIG. The inner and outer surfaces of this raw material 26 are cut to form a seat portion 23a and a flange portion 23 as shown in FIG.
It is manufactured by finishing it into a predetermined cross-sectional shape having a shape of 1.b, carving an annular groove 23c on the outer circumferential surface, and drilling a nipple engagement hole 23d in the seat 23a.

Prior to forming the outer rim 24 integrally with the inner rim 23, the hub disk 21 is assembled to the center of the inner rim 23 using wire spokes 22, as shown in FIG. The inner rim 23 and hub disc 21 are
A hub disk 21 is disposed in the center of the inner rim 23 using a fixing jig (not shown), and one end is engaged with an engagement hole 21a formed in the disk 21 to radially project the wire spokes 22. A two-piece pulley 22 whose other end is engaged with the nipple engagement hole 23d of the inner rim 23
Il to a! ! ! It is assembled by putting it on and tightening it.

Next, an outer rim 24 made of fiber-reinforced plastic is integrally molded by injection molding onto the inner rim 23 with the hub disk 21 assembled in this manner.

For injection molding of the outer rim 24, a mold 30 shown in FIG.
is used. This mold 30 includes a fixed side mounting plate 31, a fixed side movable plate 33 slidably assembled to a guide bin 32 provided upright on the mounting plate 31, a movable mold 34, and an outer peripheral mold 35 assembled to the movable mold 34. It is equipped with The fixed side mounting plate 31 has an injection port 31a and an ejector bin 31b for ejecting the gate.
, a mold opening ejector pin 31c is provided.
The fixed side movable plate 33 is formed with a fitting protrusion 33a into which the hub hole 21b formed in the center of the hub disk 21 is fitted. The outer peripheral mold 35 has a multi-segmented structure to enable molding of an undercut shape, and is assembled to the movable mold 34 so as to be slidable in the radial direction. Further, the movable mold 34 is provided with an ejector pin 34a for taking out the product.

During injection molding, the hub disk 21 is
The inner rim 23 assembled to the disk 21 is attached to the fixed movable plate 33 by fitting the hub hole 21b into the fitting convex portion 33a of the fixed movable plate 33. Next, after closing the outer mold 35 as shown in FIG. 8, the movable mold 34 is clamped, and the plasticized fiber reinforced plastic 36 is injected from the injection port 31a as shown in FIG. Cool under pressure for an hour.

Next, as shown in FIG. 10, the movable mold 34 is opened while the outer mold 35 is opened, and then the outer mold 35 is opened as shown in FIG. Then, as shown in FIG. 12, the gate 36 is removed using the ejector pin 31b.
ejector pin 34a for ejecting the product as well as ejecting a.
Remove the molded part and remove any firmness etc. As a result, the light alloy inner rim 2 as shown in FIG.
3, an automobile wire spoke wheel 20 having an integrally formed outer rim 24 made of fiber-reinforced plastic is completed.

Therefore, this embodiment provides many advantages as described below.

(1) Since the rim portion is composed of the inner rim 23 made of aluminum and the outer rim 24 made of fiber-reinforced plastic, the weight of the rim portion is reduced.

(2) There are fewer parts that require cutting, and since the outer rim 24 is integrally molded with the inner rim 23 by injection molding, mass production is excellent and costs can be reduced.

(3) Since the flange portion 23b of the inner rim 23 is reinforced by the integrally molded outer rim 24, -
It is possible to prevent the flange portion 23b from being deformed or damaged when an abnormal external force is applied due to running onto a curb on the ship.

(4) Engagement hole 23 of inner rim 23 during injection molding
Since the fiber-reinforced plastic enters the hole d and solidifies, loosening of the nipple 22a can be reliably prevented.

(5) Since the annular groove 23c is formed on the outer peripheral surface of the inner rim 23, the outer rim 24 is firmly coupled to the inner rim 23. Therefore, when driving on general roads, wheel 2
It is possible to prevent the outer rim 24 from separating from the inner rim 23 due to the cornering force applied as a bending moment relative to 0.

Note that automobile wheels are heated by brake heat, and when the hub disk 21 is attached to the wheel, the temperature of the end surface is 200°C.
Temperatures can reach between ℃ and 250℃. However, in this embodiment, since the spokes 22 and nipples 22a are made of stainless steel with low thermal conductivity, the temperature of the inner rim 23 does not rise as much as that of the hub disk 21.

Therefore, the required heat resistance can be obtained without using an expensive super heat-resistant resin material such as Bolywood for the outer rim 24.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a wire spoke wheel for an automobile according to an embodiment of the present invention, FIG. 2 is a front view of the same wheel, and FIGS. 3 to 5 show the manufacturing process of the inner rim of the same wheel. Fig. 3 is a cross-sectional view of the main part of a ring-shaped material extruded into a cylinder, Fig. 4 is a cross-sectional view of the main part of a forged material, and Fig. 5 is a cut-finished inner rim. 6 is a longitudinal sectional view showing the state of assembly of the hub disk and inner rim of the same wheel; FIGS. 7 to 12 show the forming process of the outer rim of the same wheel; Fig. 7 is a longitudinal cross-sectional view showing the state in which the inner rim assembled to the hub disk is attached to the mold, Fig. 8 is a longitudinal cross-sectional view showing the mold in a clamped state, and Fig. 9 is a longitudinal cross-sectional view of the same mold. FIG. 10 is a longitudinal cross-sectional view showing the injection molding state, FIG. , Fig. 12 is a vertical cross-sectional view showing the product of the same mold and the state of taking out the gate, Figs. 13 to 15 show the conventional rim manufacturing process using an embossed bottom shape, and Fig. 13 shows a diagram of the flat plate of material. Perspective view, 14th
The figure is a sectional view of the main part of the roll-formed material, Fig. 15 is a sectional view of the main part of the rim with an embossed bottom, and Figs. 16 and 17.
The figures show the conventional manufacturing process of rims by casting. Fig. 16 is a longitudinal cross-sectional view of the cast material, Fig. 17 is a cross-sectional view of the main parts of the finished rim, and Figs. 2
Figure 0 shows the conventional rim manufacturing process by forging, Figure 18 is a perspective view of the round bar material, Figure 19 is a longitudinal cross-sectional view of the forged material, and Figure 20 is the finished product by cutting. FIG. 3 is a sectional view of a main part of the rim. 20... Automotive wire spoke wheel, 2 hub disc, 22... Wire spoke, 23... Inner rim, 24... Outer rim

Claims (1)

[Claims] In a wire spoke wheel for an automobile in which a hub disk is assembled to the center of the rim using a plurality of wire spokes, the rim includes a light alloy inner rim connected to the hub disk using the wire spokes, and a light alloy inner rim connected to the hub disk using the wire spokes. A wire spoke wheel for an automobile characterized by an integrally molded fiber-reinforced plastic outer rim.