JPH05310001A - Wheel for vehicle and manufacture thereof - Google Patents

Abstract

(57) [Summary] [Objective] To provide a two-piece vehicle wheel which is inexpensive and has high rigidity, which can improve the strength of a joint portion between a rim and a disk at a low cost. [Structure] A wrought material of aluminum alloy is bent into a cylindrical shape and welded at both ends, and then a rim 2 is integrally formed into a predetermined rim shape by drawing. The disc 3 is formed on the inner peripheral surface of the rim 2.
The annular surface 4a is cut so as to make surface contact with the outer peripheral end surface 5a. The annular surface 4a and the outer peripheral end surface 5 of the disk 3
Both members are welded and joined so as to make surface contact with a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle wheel,
In particular, it relates to a two-piece type wheel in which a rim portion and a disc portion of the wheel are separately configured.

[0002]

2. Description of the Related Art In recent years, as an automobile wheel, a light alloy wheel which is lightweight and has high strength and rigidity and high dimensional accuracy has been widely used as the performance of automobiles and tires has improved. Such a light alloy wheel is formed by casting, forging or the like, and the disc portion thereof is formed in various shapes in order to obtain sufficient strength and to improve the appearance design.

Such wheels are divided into three types of one piece, two pieces, and three pieces according to their structure. For example, in a one-piece wheel, the entire wheel such as a rim portion and a disc portion is integrally formed by casting or forging, and in a two-piece wheel, the rim portion and the disc portion are made up of two parts, and welding or bolts are used. It is fixedly joined by tightening. Further, the three-piece wheel has an assembly method in which a disc portion is joined to a rim portion which is divided into an outer side and an inner side.

Among them, the two-piece wheel having high rigidity and relatively low price as described above is most popular at present, and its structure is as shown in FIG. 3, for example. The wheels 21 are disc-shaped disks 23 that are integrally formed.
And a cylindrical rim 22 are welded to each other. The rim 22 is formed by bending a wrought aluminum alloy material into a cylindrical shape and welding both ends, and then forming a rim shape such as a bead seat 29 and a rim bottom 24 for receiving the bead portion 7 of the tire by spinning or roll forming. Has been done. The disk 23 is formed into a disk shape by casting, pressing, or forging, and is then NC processed to form the hub hole 28 and the bolt hole 2
7 etc. are formed and processed. And the disk 23
The outer peripheral end portion 25 of the rim bottom 24 is inserted inside the rim bottom 24, and the hub fixed side end of the outer peripheral end portion 25 and the inner peripheral surface 24a of the rim bottom 24 are inserted.
By welding and joining the rim 22 and the disk 23
Are fixed together.

By the way, in recent years, the flatness ratio of 60% has been excellent in high-speed running performance and high fashionability as the performance of vehicles has improved.
The following low profile tires are becoming popular. Generally, when mounting such a low profile tire on a vehicle, replace the wheel with a wheel having a large rim diameter and a large rim width so that the outer diameter of the tire does not become small. However, a low profile tire has a high grip on the road surface and a large stress applied to the wheel, so that it is required to improve the rigidity of the wheel. In addition, the rigidity of the wheel is required to be improved in order to reduce the slight vibration during driving and to improve the safety accompanying the increase in vehicle speed. In particular, it is important to improve the strength of the joint between the rim and the disc. It has become to.

[0006]

However, in the conventional two-piece wheel as described above, since the entire rim is formed by drawing an aluminum wrought material by spinning or roll forming, the strength is improved. If a rim having a large wall thickness and a large rim diameter is to be processed, the processing accuracy is likely to decrease.

That is, it is difficult to form the rim bottom 24 into a flat shape, and the cross-sectional shape of the rim bottom 24 tends to be a curved shape protruding toward the central axis. Then, the outer peripheral end portion 25 of the disk 23 is attached to the inner peripheral surface 24a of the rim bottom 24 as described above.
When welded together, as shown in FIG. 4, a wedge-shaped gap having an angle θ is formed between the inner peripheral surface 24a and the outer peripheral surface 25a of the outer peripheral end portion 25, and the inner peripheral surface 24a and the outer peripheral surface 25a are circular. Line contact along the circumferential direction.

Further, since the surface of the rim 22 has a corrugated shape which is a trace of drawing by a roller at the time of spinning, for example, the inner peripheral surface 24a and the outer peripheral surface 25a are formed as shown in FIG. It is difficult to make contact, resulting in point contact or line contact. Furthermore, as the rim diameter increases, the roundness of the rim 22 also tends to decrease, so that it becomes difficult to uniformly contact the inner peripheral surface 24a and the outer peripheral surface 25a along the circumferential direction.

Therefore, as described above, the rim 22 and the disc 2 are
When the contact area between the joint portions of No. 3 is small, the stress acting on the joint portions is likely to concentrate in the vicinity of the welded portion 26, so that it is difficult to improve the strength of the joint portion of the rim and the disc. There's a problem. Accordingly, an object of the present invention is to solve the above problems, and to provide an inexpensive and highly rigid two-piece type vehicle wheel capable of improving the strength of a joint portion between a rim and a disk at a low cost. It is in.

[0010]

The above object of the present invention is to provide a rim portion for holding a tire and a disc portion for attaching a wheel to a hub of a vehicle, each having a unitary structure. In a two-piece type vehicle wheel in which an outer peripheral end of the disc portion is welded and joined to an inner peripheral surface, the rim portion is formed by bending an extruded material of an aluminum alloy into a cylindrical shape, welding both ends thereof, and then performing a predetermined drawing process. While being integrally formed into a rim shape, an inner peripheral surface thereof is formed with an annular surface which is carved so as to make surface contact with the outer peripheral end surface of the disk portion, and the annular surface and the outer peripheral end surface of the disk portion are formed. It is achieved by a vehicle wheel characterized in that both members are welded and joined so as to make surface contact with each other.

Further, the above-mentioned object is that after the rim portion for holding the tire and the disc portion for attaching the wheel to the hub of the vehicle are respectively constructed as a single structure, the disc is provided on the inner peripheral surface of the rim portion. In a method for manufacturing a two-piece type vehicle wheel in which the outer peripheral ends of the parts are welded and joined together, an aluminum alloy wrought material is bent into a cylindrical shape and welded at both ends, and then integrally formed into a predetermined rim shape by drawing. An annular surface is formed on the inner peripheral surface of the rim portion so as to make surface contact with the outer peripheral end surface of the disk portion, and both members are brought into surface contact with the annular surface and the outer peripheral end surface of the disk portion. It is achieved by a method for manufacturing a vehicle wheel, characterized in that

[0012]

According to the structure of the present invention as described above, since the outer peripheral end surface of the disc portion and the inner peripheral surface of the rim portion are securely welded to each other in a state of being in surface contact, the stress acting on the wheel by the external force is At the joint of both members, there is no concentration only at the weld.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a vehicle wheel 1 according to the present invention is constructed by welding and joining a rim 2 which is a cylindrical rim portion and a disc 3 which is a disk-shaped disc portion, which are integrally molded. Is.

The rim 2 has a bead seat 9 and a rim bottom 4 for receiving a bead portion 7 of a tire by bending an extruded material of an aluminum alloy into a cylindrical shape and welding both ends, and then performing a drawing process such as a spinning process or a roll forming process. And the like, and the outer peripheral end portion 5 of the disc 3 is welded and joined to the inner peripheral surface of the rim bottom 4 so that the outer peripheral end surface 5a of the disc 3 described later comes into surface contact with the cylindrical annular shape. The surface 4a is bored by a cutting tool. Therefore, in the case where the cross-sectional shape of the rim bottom 4 is a curved shape protruding toward the central axis line by drawing, has a wavy shape that is a drawing mark, or the roundness of the rim is reduced. However, a cylindrical surface parallel to the rotation axis can be formed on the inner peripheral surface of the rim bottom 4.

Further, the disk 3 is formed into a disk shape by casting, pressing or forging, and then hub holes, bolt holes and the like are formed by NC processing, and its outer peripheral end surface 5a.
Is also accurately machined so that it has a cylindrical surface parallel to the axis of rotation. Then, the outer peripheral end portion 5 of the disk 3
Is inserted inside the rim bottom 4, and the hub fixing side end of the outer peripheral end portion 5 and the inner peripheral surface of the rim bottom 4 are welded to each other, whereby the rim 2 and the disc 3 are integrally fixed. At this time, since the annular surface 4a is formed on the inner peripheral surface of the rim bottom 4 to which the outer peripheral end portion 5 of the disk 3 is joined, a wedge shape is formed between the outer peripheral end surface 5a and the annular surface 4a. 2 does not occur, and as shown in FIG. 2, the corrugated shape of the inner peripheral surface of the rim, which is a narrowing mark, is also cut flat, so that the annular surface 4a and the outer peripheral end surface 5a are surely in surface contact with each other. Are welded together.

Therefore, the stress acting on the vehicle wheel 1 due to the external force does not concentrate only on the welded portion 6 at the joint between the rim 2 and the disk 3, but is dispersed over the entire joint surface between the annular surface 4a and the outer peripheral end surface 5a. Therefore, the strength of the joint portion can be improved, and a wheel having a large rim diameter can be formed with high accuracy and high rigidity.

In the above embodiment, the annular surface formed on the inner peripheral surface of the rim is formed so as to have a cylindrical surface parallel to the rotation axis, but the present invention is not limited to this. If, for example, the outer peripheral end surface of the disc is formed in a tapered shape, the annular surface formed on the inner peripheral surface of the rim is correspondingly formed in a tapered shape, and the annular surface and the outer peripheral end surface of the disk are surely formed into a surface. Contact.

Further, the annular surface according to the present invention can be formed not only by the cutting process as in the above-mentioned embodiment but also by abrasive grain processing such as honing. Further, it goes without saying that the rim shape such as the bead seat and the rim bottom of the rim and the shape of the disc design surface in the vehicle wheel of the present invention are not limited to the shapes of the above-described embodiments, and can take various shapes.

[0019]

EFFECTS OF THE INVENTION The vehicle wheel of the present invention comprises: an inner peripheral surface of a rim portion integrally formed into a predetermined rim shape by bending an aluminum alloy wrought material into a cylindrical shape and welding both ends, and then drawing. An annular surface is formed so as to make surface contact with the outer peripheral end surface of the disc portion, and the annular surface and the outer peripheral end surface of the disc portion are brought into surface contact with each other, and then both members are welded and joined.

Therefore, since the outer peripheral end surface of the disk portion and the inner peripheral surface of the rim portion are securely welded to each other in a state of being in surface contact with each other, the stress acting on the wheel by the external force is welded at the joint portion of both members. It is possible to improve the strength of the joint portion because it is not concentrated only in the portion but is distributed over the entire joint surface between the annular surface and the outer peripheral end surface, and it is highly accurate and highly rigid even in a wheel with a large rim diameter. Wheels can be formed.

Therefore, the strength of the joint portion between the rim and the disk can be improved at a low cost, and an inexpensive and highly rigid two-piece type vehicle wheel can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing the structure of a vehicle wheel according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the vehicle wheel shown in FIG.

FIG. 3 is a partial cross-sectional view showing the structure of a conventional vehicle wheel.

FIG. 4 is a cross-sectional view of an essential part showing the structure of the vehicle wheel shown in FIG.

5 is a partially enlarged cross-sectional view of the vehicle wheel shown in FIG.

[Explanation of symbols] 1 vehicle wheel 2 rim 3 disc 4 rim bottom 4a annular surface 5 outer peripheral end 5a outer peripheral end surface 6 welded portion 7 bead portion 9 bead seat 21 vehicle wheel 22 rim 23 disc 24 rim bottom 24a inner peripheral surface 25 outer peripheral end 25a outer peripheral end face 26 welded portion 27 bolt hole 28 hub hole 29 bead seat

Claims (2)

[Claims] 1. A rim portion for holding a tire and a disc portion for attaching a wheel to a hub of a vehicle each have a unitary structure, and an outer peripheral end of the disc portion is welded to an inner peripheral surface of the rim portion. In a two-piece type vehicle wheel to be joined, the rim portion is integrally formed into a predetermined rim shape by bending an aluminum alloy wrought material into a cylindrical shape, welding both ends, and then forming an inner periphery thereof. The surface is formed with an annular surface that is cut so as to make surface contact with the outer peripheral end surface of the disk portion, and both members are welded and joined so that the annular surface and the outer peripheral end surface of the disk portion make surface contact. A vehicle wheel characterized in that 2. A rim portion for holding a tire and a disc portion for attaching a wheel to a hub of a vehicle are constructed as a single structure, and then an outer peripheral end of the disc portion is formed on an inner peripheral surface of the rim portion. In the method for manufacturing a two-piece type vehicle wheel in which the rims are welded together, the rim portion integrally formed into a predetermined rim shape by bending an aluminum alloy wrought material into a cylindrical shape and welding both ends and then drawing. An inner peripheral surface is formed with an annular surface that is cut so as to make surface contact with the outer peripheral end surface of the disk portion, and the annular surface and the outer peripheral end surface of the disk portion are surface contacted, and then both members are welded and joined. A method for manufacturing a vehicle wheel, comprising: