JPH09202104A - Wheel for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel for automobile in which a joint of a rim body with a disk body is invisible from a surface side of the disk body irrespective of two-piece, welded type, and improve the concentricity and the joining strength of the rim body and the disk body. SOLUTION: A front flange part is removed from an end part of a surface side of a rim body 10. The front flange part 24 is provided on an outer circumferential part of a disk body 20. An inclined surface 15 is provided on a bead seat part 11 of the rim body 10, and an annular receiving part 25 to which the bead seat part 11 provided on an end part on the surface side of the rim body 10 is externally fitted is provided on a back surface side of the front flange part 24. A space between the bead seat part 11 and the front flange part 24 is welded from an outer surface side of the rim body 10. The throat thickness B of a weld bead 30 is easily secured by fitting an edge part of the bead seat part 11 on which the inclined surface 15 is formed to an annular recessed part 27 formed on an inner circumferential part on the back side of the front flange part 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light alloy automobile wheel, and more particularly to a so-called two-piece weld type automobile wheel in which a rim portion and a disc portion are separately formed and integrated by welding. .

[0002]

2. Description of the Related Art Automotive wheels made of light alloys are strongly required to have design quality in addition to mechanical quality such as strength and airtightness. The rim part and the disk part are molded separately and the two are joined and integrated by welding.
In the case of a piece-welded wheel, the design quality has an appearance similar to that of a so-called one-piece wheel in which a rim body and a disc body are integrally formed,
At least the welding bead cannot be seen from the side of the disk surface. In the following description, the side of the disk surface, that is, the side exposed to the side of the vehicle body is referred to as the front side, and the opposite side is referred to as the back side.

FIGS. 5A and 5B show a conventional example of a two-piece weld type wheel. The wheel shown in FIG. 5 (A) has a rim body 4 in which flange portions 1 and 2 are provided at both ends on the front surface side and the back surface side, and a drop center 3 is provided in the central portion. Disc body 5 combined with rim body 4
Is fitted to the inner surface side of the rim body 4, and the outer ring portion is welded to the bottom surface of the drop center 3. Welding is performed from the back surface side of the disc body 5 and the inner surface side of the rim body 4.

The wheel shown in FIG. 5 (B) has a rim body 4 in which the drop center 3 between the flange portions 1 and 2 is offset from the center toward the rear surface side. The disc body 5 fitted to the inner surface side of the rim body 4 is welded to the inner peripheral surface of the rim body on the surface side of the drop center 3. Welding here is also disk body 5
From the inner surface side of the rim body 4. 6
Is a weld bead.

[0005]

In the two-piece welding type wheel shown in FIGS. 5A and 5B, the welding bead 6 is formed on the back surface side of the disk body 5, so that The weld bead 6 cannot be seen from the surface side of the disc body 5. However, since the disc body 5 is fitted to the inner surface side of the rim body 4, the seam can be seen from the front surface side and can be distinguished from the wheel having a one-piece structure at a glance. Further, the welding work is easier from the outer surface side of the rim body 4 than from the inner surface side thereof, but this is disadvantageous because all wheels require welding from the inner surface side of the rim body 4.

Regarding the fact that the appearance of the wheel is similar to that of a one-piece structure wheel, in the case of a steel wheel, as shown in FIG.
The structure shown in is known. This is one in which the flange portion 1 is removed from the end portion on the front surface side of the rim body 4 and the flange portion 1 is provided on the outer peripheral portion of the disc body 5, and is provided on the end portion on the front surface side of the rim body 4. It is manufactured by welding the bead seat portion 7 to the outer periphery of the back surface of the disk body 5.

According to this structure, the seam between the rim body 4 and the disc body 5 and the weld bead 5 are hidden on the back side of the disc body 5, and when viewed from the front side of the disc body 5, it has a one-piece structure and a two-piece structure. No distinction can be made. However, since the rim body 4 is not positioned with respect to the disc body 5,
There is a problem that the concentricity of both is not good. The surface side of the flange portions 1 and 2 at both ends is particularly called a front flange portion.

The present invention was devised in view of such circumstances, and although it is a two-piece welded type light alloy wheel, its appearance is very similar to that of a one-piece structure wheel and the rim body and the disc body are combined. An object of the present invention is to provide an automobile wheel having excellent concentricity, particularly high joint strength between a rim body and a disc body, and further easy welding work.

[0009]

A vehicle wheel according to the present invention has a front side at an end on the front side in the wheel center axis direction, where the side exposed to the side of the vehicle body is the front side and the opposite side is the back side. A rim body made of a light alloy having no flange portion and a bead seat portion provided at its end, and the front flange portion provided at the outer peripheral portion, and the bead of the rim body located on the back side of the front flange portion. A disc body made of a light alloy provided with an annular receiving portion to which the seat portion is fitted, and a bead seat portion of the rim body fitted to the annular receiving portion of the disc body and a front flange portion of the disc body, An automobile wheel joined by welding from the outer surface side of a rim body, wherein an inclined surface is formed at an end edge portion of the bead seat portion, and an annular surface is formed on an inner peripheral surface of a rear surface of a front flange portion of a disk body. Concave There is formed, the edge portions of the bead seat of the rim body fitted to an annular receiving portion of the disk body is fitted into the annular recess.

In the vehicle wheel according to the present invention, the rim body is cantilevered on the back side of the disc body.
As a result, the joint between the rim body and the disc body is hidden on the back side of the disc body, but on the other hand, a large force is applied to the weld bead formed between the bead seat portion and the front flange portion. The annular receiving portion provided on the rear surface side of the front flange portion is effective in reducing this force, but the weld bead is still important.

Regarding the weld bead, in the automobile wheel according to the present invention, the bead portion of the tire corresponds to the weld bead. Therefore, it is desired to curve the surface of the weld bead in a concave shape corresponding to the surface of the bead portion of the tire. However, by making the surface of the weld bead concave, it becomes difficult to secure the height of the weld bead called the throat thickness. Regarding the throat thickness, it is necessary to be larger than the wall thickness of the bead sheet portion of the rim body, but this becomes difficult by making the surface of the weld bead concave.

In the automobile wheel according to the present invention, an inclined surface is formed at the end edge of the bead seat portion, and an annular recess is formed in the inner peripheral surface of the rear surface of the front flange portion of the disc body to form an annular support for the disc body. The edge portion of the bead seat portion of the rim body that is externally fitted to the portion is fitted into the annular recessed portion, even when the surface of the weld bead is curved concavely, the thickness of the bead seat portion of the rim body This is to easily secure a large throat thickness.

In the automobile wheel according to the present invention, from the viewpoint of increasing the throat thickness, it is desired that the edge portion of the bead seat portion be thicker than the other portions.

Further, from the viewpoint of reducing the force applied to the weld bead, it is desirable to provide an annular protruding portion projecting to the rear surface on the outer peripheral portion of the rear surface of the disk body so as to extend the annular receiving portion of the disk body to the rear surface side. Be done.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional side view showing the entire structure of an example of an automobile wheel embodying the present invention, FIG. 2 is a front view of the same wheel, and FIG. 3 is a vertical sectional view showing main parts of the wheel in comparison with a comparative example. It is a side view.

As shown in FIGS. 1 and 2, the present wheel is a two-piece welded type automobile wheel in which a rim body 10 and a disc body 20 made of a light alloy such as an aluminum alloy are integrated by welding. .

The rim body 10 has a structure in which the front flange portion is removed from the end portion on the front surface side, and a bead seat portion 11 is provided at the end portion. On the back surface side of the bead seat portion 11, a drop center 12 recessed toward the inner surface side is provided. The drop center 12 is located on the surface side with respect to the center of the rim body 10 in the central axis direction, and the portion on the surface side from the deepest portion is a steeply inclined portion that rapidly increases in diameter toward the surface side. The portion on the back surface side is a gently inclined portion whose diameter gradually increases toward the back surface side. A flange portion 14 is provided at an end portion on the back surface side of the rim body 10 via a bead seat portion 13. Bead seat part 11, 13
Are parallel to the wheel center axis.

As shown in FIG. 3A, an inclined surface 15 is provided at the edge of the bead seat portion 11.
The inclined surface 15 is dimensioned so that the edge portion of the bead seat portion 11 enters an annular recess 27 formed in the disk body 20 described later.

Disc body 2 combined with rim body 10
0 has a hub portion 21 at the center. The hub portion 21 is connected to the ring portion 23 on the outer periphery by a plurality of spokes 22 radially extending from the outer peripheral surface to the outer surface side. The ring portion 23 is integrally provided with a front flange portion 24 protruding to the outer surface side, and an annular receiving portion 25 to which the bead seat portion 11 of the rim body 10 is fitted is located on the back surface side of the front flange portion 24. Is provided. The outer peripheral surface of the annular receiving portion 25 is parallel to the wheel center axis.
In order to extend the annular receiving portion 25 to the back side, the ring portion 2
An annular protruding portion 26 that protrudes to the back surface side is integrally provided in 3.

At the joint between the rim body 10 and the disc body 20, as shown in FIG. 3 (A), an annular recess 27 is formed in the inner peripheral surface of the back surface of the front flange portion 24.
The structure is such that the end edge portion of the bead seat portion 11 fitted on the annular receiving portion 25 fits therein. The bead seat portion 11,
A gap is formed between this and the annular recess 27 into which it is fitted.

Then, the bead seat portion 11 and the front flange portion 24 are joined to each other by a weld bead 30 formed at an inner corner portion thereof. That is, as shown in FIG. 3 (A), the rim body 10 and the disc body 20 are connected and integrated in a gap between the bead seat portion 11 and the annular recess 27 into which the bead seat portion 11 is fitted. For this reason, FIG.
As shown in (A), the throat thickness B is larger than that of the conventional one (see FIG. 2B). As a result, it can be seen that the bonding strength between the rim body 10 and the disc body 20 is higher than in the conventional case.

The dimensions of the surface of the weld bead 30 are specified by the JIS standard or the like so that the bead portion of the tire is in close contact. For this reason, after welding, the surface of the weld bead 30 is cut by cutting so as to conform to the JIS standard and the like, and is curved in a concave shape corresponding to the surface of the bead of the tire. In addition, the surface thereof is subjected to finishing processing if necessary.

The outer diameter of the annular receiving portion 25 is set to be slightly larger than the inner diameter of the bead seat portion 11 when the rim body 10 and the disc body 20 are molded. Then, at the assembly stage, until the end surface of the bead seat portion 11 comes into contact with the bottom surface of the annular recess 27, the bead seat portion 11 is formed.
The annular receiving portion 25 is shrink-fitted or press-fitted into the inside of the. As a result, the rim body 10 and the disc body 20 are combined. After that, the bead seat part 11 and the front flange part 2
By welding from the outer surface side of the rim body 10 to the inner corner of the rim body 4, the rim body 10 and the disc body 20 are welded.
Are joined and integrated.

For welding, it is desirable to overlap the start end of the weld bead with the end and cut the end into a predetermined shape in order to ensure the airtightness of the weld.

This wheel has the following features.

The disk body 20 has a front flange portion 24.
Since the rim body 10 is welded to the back surface of the front flange portion 24, the joint between the rim body 10 and the disk body 20 and the weld bead 30 cannot be seen from the front surface side, and the one-piece structure is formed from the front surface side. Looks the same.

Since the bead seat portion 11 of the rim body 10 is fitted on the annular receiving portion 25 of the disc body 20, concentricity between the rim body 10 and the disc body 20 can be easily obtained during welding. Further, since the bead seat portion 11 is supported from the inner surface side by the annular receiving portion 25, the force applied to the welding bead 30 is reduced and the joint strength between the rim body 10 and the disc body 20 is improved. In welding, the work is good because the work is performed from the outer surface side of the rim body 10.

In particular, in this wheel, the edge portion of the bead seat portion 13 provided with the inclined surface 15 is fitted in the annular recess 27 formed in the inner surface of the back surface of the front flange portion 24, so that FIG. As compared to the case where the inclined surface 15 and the annular recess 27 are not formed as in (B), it is easier to secure the throat thickness B of the welding bead 30. Therefore, although the surface of the weld bead 30 is concavely curved corresponding to the surface of the bead portion of the tire, a throat thickness B larger than the wall thickness B of the bead seat portion 11 can be easily secured. Also improves the bonding strength.

The depth of the annular recess 27 is 10 to 20.
About mm is desirable. If this is small, it is not easy to secure the throat thickness B, but if it is too large, the gap between the inclined surface 15 and the annular recess 27 is not completely welded due to the relationship of the welding jig or the like.

In addition to these, in the present wheel, since the annular receiving portion 25 is extended by the annular protruding portion 26, the force applied to the welding bead 30 is further reduced, and the joining strength between the rim body 10 and the disc body 20 is particularly high. . The depth dimension of the annular receiving portion 25 needs to be at least twice the thickness dimension of the bead seat portion 11. If the depth dimension is small, the force applied to the weld bead 30 cannot be sufficiently reduced, so that there is a risk of problems in the life and safety of the automobile wheel, but there is no need to make it particularly large.

Regarding the welding, the annular receiving portion 2 of the disc body 20 is further divided from the inner diameter of the bead seat portion 11 of the rim body 10.
Since the rim body 10 and the disk body 20 are molded so that the outer diameter of 5 becomes large and the annular receiving portion 25 is shrink-fitted or press-fitted into the bead seat portion 11, the bead seat portion 1
The stress in the direction of expansion is applied to 1 and the front flange 2
The welding distortion of the bead seat part 11 at the time of welding with No. 4 is prevented.

FIG. 4 is a vertical sectional side view showing another example of an automobile wheel embodying the present invention. In this example, the vicinity of the edge of the bead seat portion 11 fitted into the annular recess 27 is thickened to the outer surface side. By doing so, it becomes easier to secure a large ratio (A / B) of the throat thickness B of the weld bead 30 to the wall thickness A of the bead seat portion 11.

[0033]

As described above, in the automobile wheel according to the present invention, the front flange portion is excluded from the end portion on the front surface side of the rim body, and the front flange portion is provided on the outer peripheral portion of the disc body, Since the rim body is welded to the back surface of the front flange portion, the joint between the rim body and the disk body and the weld bead are hidden on the back surface side of the front flange portion. Therefore, even though it is a two-piece welded type, it looks like the one-piece structure from the surface side and is excellent in design.

Since the bead seat portion provided at the end portion on the front surface side of the rim body is externally fitted to the annular receiving portion of the disc portion, the centering when combining the two is easy and the centering accuracy is high. Further, since the rim body is supported by the annular receiving portion and the force applied to the weld bead is reduced, the rim body and the disc body are supported in a cantilevered manner on the back side of the disc body. Has high joint strength. Since welding is performed from the outer surface side of the rim body, welding work is also easy.

In addition to these, an annular recess is formed in the inner peripheral surface of the back surface of the front flange, and the edge portion of the bead seat portion having the inclined surface is fitted therein, so that it corresponds to the surface of the bead portion of the tire. Even when the surface of the weld bead is curved concavely, the throat thickness of the weld bead, which is larger than the wall thickness of the bead sheet portion, can be easily secured, and the joint strength can be improved also from this point.

If the edge portion of the bead sheet portion is thicker than the other portions, it becomes easier to secure the throat thickness of the weld bead.

In the case where an annular projecting portion projecting to the back surface side is provided on the outer peripheral portion of the back surface of the disk body in order to extend the annular receiving portion of the disk body to the back surface side, the rim formed by the disk body does not have to be thickened. The body supporting strength is increased, and the force applied to the welded portion is reduced accordingly, so that the joint strength between the rim body and the disc body is further increased.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an entire structure of an example of an automobile wheel embodying the present invention.

FIG. 2 is a front view of the wheel.

FIG. 3 is a vertical cross-sectional side view showing a joint portion between a rim body and a disc body of the wheel in comparison with a comparative example.

FIG. 4 is a vertical sectional side view showing another example of a joint portion between a rim body and a disc body.

FIG. 5 is a vertical sectional side view showing a conventional example of a two-piece welded light alloy wheel.

FIG. 6 is a vertical sectional side view showing a steel wheel structure.

[Explanation of symbols]

 10 rim body 11,13 bead seat portion 12 drop center 15 inclined surface 20 disk body 21 rim portion 22 spoke 23 ring portion 24 front flange portion 25 annular receiving portion 26 annular protruding portion 27 annular concave portion

Claims (4)

[Claims] 1. A front exposed side of a vehicle body is a front side, and an opposite side thereof is a back side. There is no front flange portion at an end on the front side in the wheel center axis direction, and a bead seat portion is provided at the end. A light alloy rim body is provided, and the front flange portion is provided on the outer peripheral portion, and an annular receiving portion, which is located on the back surface side of the front flange portion and to which the bead seat portion of the rim body is fitted, is provided. An automobile comprising a disc body made of a light alloy, and a bead seat portion of a rim body fitted to an annular receiving portion of the disc body and a front flange portion of the disc body are joined by welding from the outer surface side of the rim body. A wheel for vehicle, wherein an inclined surface is formed at an end edge portion of the bead seat portion, an annular recess is formed in an inner peripheral surface of a rear surface of a front flange portion of the disc body, and an outer peripheral portion is formed in an annular receiving portion of the disc body. Rim to fit An automobile wheel, wherein an end edge portion of a bead seat portion of a body is fitted in the annular recess. 2. The vehicle wheel according to claim 1, wherein an end edge portion of the bead seat portion is thicker than other portions. 3. The surface of the weld bead formed between the bead seat portion and the front flange portion is concavely curved corresponding to the surface of the bead portion of the tire. The vehicle wheel according to item 2. 4. An annular projecting portion projecting to the back surface side is provided on the outer periphery of the back surface of the disk body so as to extend the annular receiving portion of the disk body to the back surface side. The vehicle wheel according to item 3.