JPS5811321B2 - vehicle wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is constructed by integrally molding the bub part and the spoke part by casting, and molding the rim part by rolling, and joining them together, which is lightweight, has high strength, and has an excellent appearance. This relates to vehicle wheels that have a good appearance and high commercial value.

BACKGROUND ART In recent years, various so-called "cast wheels" in which the wheels are formed by casting have been proposed and put into practical use in vehicle wheels consisting of a bubble part, a spoke part, and a rim part.

By the way, such a conventional "cast wheel" is either one in which the bubble part, spoke part, and rim part are all integrally cast, or two parts in which the bubble part, spoke part, and rim part are each molded individually by casting, etc. , and those in which they are integrated by means of connection such as bolts and rivets, but in the case of item ① above, since the bub part, spoke part, and rim part are integrally molded, the hot water supply during casting is particularly difficult. It is necessary to improve the flow of hot water around the thin rim part so that the strength of the rim part is not impaired.For this purpose, it is necessary to install multiple sprues around the outer periphery of the rim part, or to connect the rim from the center of the bub part. In order to improve the vortex flow to the parts, it was necessary to make the spoke parts thicker than originally necessary.

However, if such measures are taken, a process of cutting multiple sprues after casting and a process of machining the cut parts are required, which increases the overall man-hours, or increases the overall weight due to the thick spokes. , and in the case of ■ above, the bubble part,
After separately molding the spoke portions and rim portions, machining and joining and assembling them not only requires a large number of man-hours, but also results in poor yield due to single-piece molding, resulting in the problem described in item (2) above.

Satisfactory results were not obtained in any of the cases (2).

In view of the above, the present invention integrally molds the bub part and the spoke part by casting, rolls the rim part from a malleable material, and provides foot pieces on the inner circumferential surface of the rim part at parts corresponding to the spoke parts. The legs are integrally protruded, and the side cross-sectional shape of each leg piece is formed into a dovetail shape that gradually becomes wider toward the bub part, and the leg pieces are integrally cast together with the tips of the spoke parts to form a vehicle. It is an object of the present invention to provide a new vehicle wheel that can eliminate all of the drawbacks of the conventional "cast wheel" by configuring the wheel.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 and 2. The vehicle wheel of the present invention is composed of a hub portion H, a spoke portion S1, and a rim portion R, of which the rim portion R is of the A1 type. A band-shaped or annular material with good malleability such as a light alloy is roll-formed, and when the rim portion R is roll-formed, a portion of the inner circumferential surface of the rim portion R that corresponds to the tip of the spoke portion S is formed. At the same time, one foot piece is molded on each.

On the other hand, the hub portion H and the spoke portions S are integrally molded by normal casting, and at the time of casting, the leg piece 1 of the rim portion R is cast with the tips of the spoke portions S to integrate them. The rim portion R is set in upper and lower molds in which cavities with shapes corresponding to the bubble portion H and spoke portions S are formed, and an A1-based light alloy material with good castability is poured into the mold. Then, Babu H
and the spoke portions S are integrally cast, and the tip portions corresponding to the spoke portions S are cast into a plurality of leg pieces 1 protruding from the circumferential surface of the rim portion R set in the mold,
Bub part H, spoke part S and rolled rim part R
A wheel is formed that integrates the two.

In the embodiment described above, the plurality of legs 1 may be welded to the inner circumferential surface of the rolled rim portion R, as shown in FIG. 3, instead of being rolled integrally with the rim portion R.

4 to 6 show the side cross-sectional shape of the leg 1 and the state in which it is connected to the spoke portion S.

In the example shown in FIG. 4, the side cross-sectional shape of the leg piece 1 is formed into a dovetail shape that gradually becomes wider toward the bub portion H, and in the examples shown in FIGS. 5 and 6, the side cross-sectional shape is also formed into a dovetail shape. One or more through-holes 2 are bored in the molded material, and hot water during casting can pass through the through-holes 2.

In any case of the leg pieces 1 shown in FIGS. 4 to 6, when the spoke part S is cast and cooled, a tensile force due to contraction of the spoke part S acts on each leg piece 1. The tensile force acts intensively on the slopes on both sides of the leg 1, and each leg 1 is strongly pulled toward the proximal end of the spoke S so that the slopes are bitten into the tip of the spoke S. The connection between the piece 1 and the spoke portion S can be further strengthened by utilizing the above-mentioned tensile force.

As described above, according to the present invention, the spoke portion and the bub portion are integrally formed by casting, and the rim portion is formed by rolling a malleable material, and the rim portion is formed with the spoke portion on the inner peripheral surface thereof. Since the vehicle wheel is constructed by integrally protruding the legs at the corresponding parts and casting the legs together with the tips of the spoke parts, the sprue can be cut like a conventional "cast wheel". , there is no need for complicated man-hours such as machining, assembly, etc., and there is no need to make the rim part thicker than necessary or the spoke part thicker in consideration of water seepage, strength, etc. It is lightweight, has a good yield, and has high overall strength.Furthermore, since only the bub and spoke parts are integrally cast, there is no restriction on the shape from the rim, and there is a large degree of freedom in design, which improves the appearance. A vehicle wheel with good appearance and high commercial value can be obtained.

In addition, since the side cross-sectional shape of each of the leg pieces is formed into a dovetail shape that gradually becomes wider toward the bub portion, the shrinkage of the spoke portion acts on each leg piece when the spoke portion is cooled during casting. By applying tensile force particularly to the slopes on both sides of each leg, each leg can be strongly pulled toward the proximal end of the spoke so that the slopes bite into the tips of the spokes. The connection between the piece and the spoke part can be further strengthened by using the above-mentioned tensile force, and even though the spoke part and the rim part are formed by casting and rolling respectively, it is possible to tightly and firmly integrate the two parts. can.

[Brief explanation of the drawing]

Figure 1 is a front view of the wheel of the present invention, and Figure 2 is the same as Figure 1.
3 is a partial sectional view showing a modified example of the joint between the rim part and the leg piece, and Figure 4.5.6 is a partial sectional view showing the state of the joint between the rim part and the spoke part. be. H: Bub portion, R: Rim portion, S: Spoke portion, 1: Leg piece, 2: Through hole.

Claims (1)

[Scope of Claims] 1 Consisting of a bub portion and a spoke portion integrally formed by casting, and a rim portion formed by rolling molding of a malleable material, the rim portion has an inner peripheral surface of A leg piece is integrally provided at a portion corresponding to the spoke portion, respectively,
A vehicle wheel, wherein each of the leg pieces has a dovetail-like side cross-sectional shape that gradually becomes wider toward the bub portion, and the leg pieces are integrally cast together with the tips of the spoke portions. 2. The vehicle wheel according to claim 1, wherein the foot piece is provided with one or more through holes through which hot water passes.