JPH0732805A - Automobile wheel - Google Patents

Abstract

PURPOSE:To reduce the occurrence of cracking at the welded portion even when unusual outer force is applied to a face-side flange by covering a face-side seam between a rim and a disc with the welded portion for good appearance to reduce the occurrence of cracking at the face-side flange. CONSTITUTION:A face-side flange 10a of plate material is formed integrally with a rim 10. A disc 11 has the outer periphery fitted to the fitting face 10d on the back side of the face-side bead sheet 10c of the rim 10. The outer face 11c at the fitting portion 11a of the disc 11 is shifted to the rim center side of the flange outer face 10e of the rim 10 to form the welded face 10f outside the fitting face 10d of the rim side. All-round fillet welding 13 is given between the welded face 10f and the outer face 11c at the fitting portion 11a of the disc 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile wheel, and more particularly to a two-piece full face type wheel.

[0002]

2. Description of the Related Art Conventionally, as a light alloy two-piece full-face type wheel, for example, as shown in FIG. 4, a front side portion is formed by a light alloy disc 1, and a rim 2 is formed at a back end 1a of the disc 1. The well portion 2a of
There is a well welding type in which the fitting portions are fixed to each other by welding 3.

The rim 2 of this well-welding type has an unnecessary dotted line portion 2b after a deformed rim 2c of a single flange having a dotted line portion 2b as shown in FIG. 5 is previously formed by pressing or spinning. 6 or by forming a rim 2e for a two-piece wheel having a dotted line portion 2d which is a front side flange portion by conventional roll forming as shown in FIG. Are removed to form.

As another structure, as shown in FIG. 7, a front portion is formed by a disc 4 made of light alloy, and a bead seat portion 5a of a rim 5 is fitted to a rear outer peripheral surface 4a of the disc 4. There is also a bead sheet welding type in which the fitting portions are fixed to each other by welding 6.

The rim 5 of this bead sheet welding type is difficult to form in the conventional roll forming if the shape is unbalanced.
After forming the two-piece rim having the dotted line portion 5b which is the front side flange portion by the roll forming as shown in FIG. 1, the unnecessary dotted line portion 5b is removed and formed.

Further, as shown in FIG. 9, a front flange 7a is formed on the rim 7, the outer peripheral surface 8a of the disk 8 is fitted to the fitting surface 7b of the rim 7, and the rim 7 is formed on the rear surface side of the disk 8. And the disk 8 are fixed to each other by welding 9, the outer surface 8b of the fitting portion of the disk 8 is located substantially on the same surface as the outer surface 7c of the rim flange, and the outer peripheral portion is chamfered 8c.

[0007]

The conventional well-welding type shown in FIG. 4 has the following problems.

When an abnormal external force is applied to the front side flange 1b due to a wheel riding on a curb during traveling on a general road surface, if the front side flange 1b is formed by casting together with the disk 1, the front side flange 1b is formed. Defects and cracks are likely to occur on the surface, and there is a risk of air leakage. In order to solve this, it is necessary to form the front side flange 1b and the vicinity of the flange to be thick, and if the thickness is made thick, there is a problem in recent years that hinders weight reduction in a light alloy wheel which is particularly strongly oriented to weight reduction. is there.

Further, in order to form the rim 2, forming the unnecessary portion in advance as described above and removing it later has the problems of increasing the number of manufacturing steps and increasing the cost.

Further, since the portion 6 shown in FIG. 4 has an undercut shape, it is difficult to remove the excess thickness with an ordinary die, so that the portion has a thick shape. Therefore, there are problems that casting defects such as porosity are likely to occur, air leaks and other defects are likely to occur, and the weight reduction of the wheel is hindered.

Also, in the conventional bead seat welding type shown in FIG. 7, if the front side flange 4b is formed by casting together with the disk 4, similar to the above, defects and cracks due to abnormal external force are likely to occur. There is a risk of air leakage, and if a thick wall is used to eliminate this, there is a problem that weight reduction is hindered. Further, when the rim 5 is formed, it is necessary to remove the front side flange 5b, so that there are problems that the number of manufacturing steps is increased and the cost is increased as in the above case.

Further, in the conventional device shown in FIG. 9,
Although the above problem is solved, there is a problem that the joint portion 8d between the rim and the disk appears on the surface as it is and the appearance is spoiled. Further, it is conceivable that welding is performed at the seam portion 8d in order to hide the seam portion 8d. However, in this case, when the external force as described above is applied to the front side flange 7a, the welding is performed. There is a problem that a crack may occur in the part and a danger may occur during traveling.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to propose a vehicle wheel which can solve the above problems.

[0014]

In order to solve the above-mentioned problems, the present invention forms a front side flange integrally with a rim by a plate material, and uses the back surface of the front side beat seat portion as a fitting surface, and the fitting surface. In the case of fitting the outer peripheral surface of a disc having no front side flange, the outer surface (11c) of the fitting portion (11a) of the disc (11) is moved from the flange outer surface (10e) of the rim (10) to the rim center side. The welding surface (10f) is formed on the outer side of the fitting surface (10d) on the rim side by being deviated, and the outer surface (11c) of the fitting surface (11a) between the welding surface (10f) and the disk (11). ) And fillet welds (13) around the entire circumference.

[0015]

In normal road running, even if an abnormal external force is applied to the front flange (10a) by riding on a curb, the front flange (10a) is formed integrally with the rim (10) by a plate material and has toughness. The front side flange (10a) is not damaged or cracked.

Further, since the welded portion (13) is displaced to the rim center side from the rim flange outer surface (10e), an abnormal external force is applied to the front side flange (10a) as described above, and thus the front side flange (10a). ) Part is deformed sharply inward, the deformation of the welded part (13) is extremely small.
Generation of cracks in 3) is prevented.

[0017]

EXAMPLES Next, examples of the present invention shown in FIGS. 1 to 3 will be described. Reference numeral 10 denotes a rim, which is formed by conventional roll forming into a two-piece wheel rim having a front side flange 10a, a back side flange 10b, and a fitting surface 10d formed on the bead seat portion 10c as shown in FIG. ing.

Reference numeral 11 denotes a disk, which is formed into a shape as shown in FIG. 3 by casting or casting and mechanical processing. The fitting portion 11 is provided on the outer peripheral portion of the disk 11.
a is formed, and the diameter of the fitting surface 11b is the same as that of the rim 10 described above.
It is formed to have a diameter slightly larger than the diameter of the fitting surface 10d in the above, and is formed so as to secure a certain tightening margin (about 0.3 to 0.5 mm) between both fitting surfaces 10d and 11b. There is.

Further, the disk 11 in the fitting portion 11a
The thickness width d in the axial direction X-X is slightly shorter than the length D of the fitting surface 10d of the rim 10, and the fitting portion 11a of the disc 11 is fitted to the fitting surface 10d of the rim 10. When fitted together, as shown in FIG. 1, the outer surface 11c of the fitting portion 11a has a front side flange 10 of the rim 10.
The outer surface 10a of a is offset by a distance A toward the rim center line YY.

Reference numeral 12 denotes a surplus thickness removing portion, which is formed by providing a surplus thickness removing mold portion on the mold when the disk 11 is cast or cast. Next, a method of assembling the rim 10 and the disc 11 will be described.

First, the rim 10 formed as shown in FIG. 2 is heated to a predetermined temperature (about 150 ° C. to 180 ° C.) and thermally expanded in the outer peripheral direction, and the diameter of the fitting surface 10d is adjusted to the above-mentioned interference. It is expanded to a state where there is no such a state, and the fitting surface 11b of the disk 11 is closely fitted to the fitting surface 10d.

After the fitting, when the rim 10 cools, the rim 10 contracts in the outer peripheral direction, and the diameter of the fitting surface 10d decreases. Therefore, the fitting surface 10 of the rim 10
d and the fitting surface 11b of the disk 11 are pressed against each other.

Next, the front side portion of the fitting surface 10d of the rim 10 and the outer surface 11c of the disk 11 are fixed by welding 13. In this welding, the outer surface 11c of the disk 11
Is offset from the outer surface 10e of the rim 10,
Since the welding surface 10f is formed on the front side portion of the fitting surface 10d, a proper fillet weld shape can be secured, and the welding position should be a position that is not adversely affected by the deformation of the front side flange 10a. You can

Therefore, an impact test (impact test)
It is possible to improve the strength of the welded portion to the front side flange 10a of the rim 10 by applying an abnormal external force to the rim 10 when traveling on a general road.
Even if 0a is sharply deformed inward, it is possible to prevent the occurrence of cracks in the welded portion.

Next, after the above fitting and welding, the welded outer surface and its periphery are cut and finished with a smooth curve as shown in FIG. 1 to complete the wheel. The rim 10
The disk 11 is made of a light alloy such as an aluminum alloy, and the same light alloy is used as the welding material.

As described above, in the wheel of the present invention, since the front side flange is formed of a plate material integrally with the rim, the front side flange is rich in toughness, and the front side flange is cast by the conventional method. There are few defects and cracks found in those formed by or casting, which reduces the danger of running. Furthermore, the welded portion between the rim and the disc is provided on the front side, and the welded portion on the front side between the rim and the disk is covered with this welded portion. The aesthetics of can be enhanced. Moreover, even if the welded portion is positioned at the front side seam in this way, the welding position is deviated from the outer surface of the rim flange to the rim center side, so that even when an abnormal external force is applied to the rim flange, the welding is performed. The occurrence of cracks in the part is reduced, and the risk of running can be reduced.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the rim.

FIG. 3 is a side sectional view of the disc.

FIG. 4 is a side sectional view showing a first example of a conventional structure.

FIG. 5 is a view showing a formation state of the rim.

FIG. 6 is a view showing another formation state of the rim.

FIG. 7 is a side sectional view showing a second example of the conventional structure.

FIG. 8 is a view showing a formation state of the rim.

FIG. 9 is a side sectional view showing a third example of the conventional structure.

[Explanation of symbols]

10 ... Rim 10a ... Front flange 10c ... Front bead seat part 10d ... Fitting surface 10e ... Flange outer surface 10f ...
Welding surface 11 ... Disc 11a ... Fitting portion 11b ... Fitting surface 11c ... Outer surface 13 ... Welding portion

Claims (1)

[Claims] 1. A method in which a front side flange is formed of a plate material integrally with a rim, and a back surface of the front side beat seat portion is used as a fitting surface, and an outer peripheral surface of a disc having no front side flange is fitted to the fitting surface. , The outer surface (11c) of the fitting portion (11a) of the disc (11) is deviated from the flange outer surface (10e) of the rim (10) toward the rim center side, so that the fitting surface (10d) on the rim side is A welding surface (10f) is formed on an outer side portion, and a full circumference fillet weld (13) is performed by the welding surface (10f) and the outer surface (11c) of the fitting portion (11a) of the disc (11). Wheels for automobiles.