JP2002293104A - Light type wheel for automobile and method for manufacturing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve strength of a hub mounting bolt hole part of a light wheel made of aluminum and a hard resin material by integrally burying a porous metallic body into the hole part. SOLUTION: This wheel is constituted by integrally burying each porous metallic body in a plurality of hub mounting bolt parts formed at a hub hole peripheral edge of the wheel. Therefore, a failure for hindering smoothness such as so-called the 'galling' is not generated by repeated fastening of a nut on a hub bolt in a hub mounting bolt hole part, more particularly, in a nut seat part, and wear resistance and strength can be remarkably improved without performing working such as coining and shot blast on the nut seat surface. As a result, mounting accuracy on a vehicle side hub can be improved by a relation of fastening torque of the nut on the hub bolt and axial force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight automobile wheel using a soft material such as aluminum or resin, and a method of manufacturing the same, and more particularly to a hub mounting bolt hole when casting a light alloy or injecting a hardened plastic material. By integrally casting or embedding a porous metal body in the portion, the wear resistance and strength of the hub mounting bolt hole portion, especially the nut seat, are improved, and thereby the mounting accuracy to the vehicle side hub is improved. The purpose is to:

[0002]

2. Description of the Related Art In particular, as a wheel for a passenger car such as a normal passenger or a bus, a light-weight material such as a light alloy such as aluminum or a plastic material is frequently used because of a demand for light weight and fashionability. In these wheels, about 5 to 8 hub mounting bolt holes are usually formed at equal intervals on the peripheral edge of the hub hole, and the hub mounting bolt holes are provided on the vehicle-side hub so as to protrude. After the wheels are mounted in alignment with the hub bolts, nuts are screwed into the hub bolts protruding from the hub mounting bolt holes, and the wheels are mounted.

[0003] However, there are relatively many occasions in which wheels must be attached to or removed from the vehicle, such as when the tires are punctured or rotated, or when checking the brake drum, and resin materials such as light alloys such as aluminum and hard plastics are used. Lightweight wheels are made of relatively soft material compared to iron wheels, so a heavy load is applied to the bolt hole by tightening the nuts each time the wheel is attached and detached, especially on the nut seating surface at the opening edge of the bolt hole. This causes a problem that impairs smoothness such as so-called "scraping". As a result, it is easy to impair the accuracy of wheel mounting due to the relationship between the tightening torque and the axial force.

So far, in the case of a light alloy wheel, after machining, the nut seating surface of the hub mounting bolt hole is subjected to pressure by coining or shot blasting to harden the portion. In the case of a resin wheel, a hard insert member such as iron having a hub mounting bolt hole formed at the center is integrally embedded in a hub mounting bolt hole portion of a resin wheel.

[0005]

However, in the former light alloy wheel, since the material of the portion is aluminum or the like, even if the nut seating surface is subjected to coining or shot blasting, the effect is still small. Not so big, and even on the latter resin wheels,
Not only is a mold or a hard material separately necessary for molding the insert member having the nut seat, but also because the insert member is not integrated with the wheel resin material, the part is easily cracked or cracked, and Since an insert process into the hub mounting bolt hole is required separately, an increase in cost is inevitable.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned problems in the prior art, and can be integrally formed at a low cost without discomfort with a wheel material, and has a nut in a bolt hole. A lightweight wheel made of aluminum or resin capable of remarkably improving the surface hardness of a seat portion. Specifically, a plurality of hub mounting bolt holes formed around the hub hole of the wheel. The present invention relates to a lightweight wheel for an automobile, wherein a porous metal body is integrally embedded in each part.

The present invention also provides a hub mounting bolt hole formed around a wheel hub hole in a lower die when a lightweight wheel is cast or injection molded using a resin material such as a light alloy such as aluminum or a reinforced plastic. A porous metal body is mounted in advance on the portion, and the porous metal body is impregnated with the molten metal or the melt of the lightweight wheel material by casting or injection molding, and is embedded in each hub mounting bolt hole after casting or injection molding. The present invention also relates to a method for manufacturing a light-weight automotive wheel in which a surface of a nut seat in an opening is subjected to a smoothing process.

In the above construction, after casting of the light alloy wheel or after injection of the resin material wheel, the surface portion of each hub mounting bolt hole, particularly the casting surface or the hardened resin surface formed on the nut seat surface. By cutting or polishing to secure the taper accuracy, a lightweight wheel having a high hardness inclined nut seat surface portion in which a porous metal body is embedded is completed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the present invention will be described below with reference to FIGS.
In the first embodiment, reference numeral 1 denotes a lightweight wheel cast from an aluminum alloy, 2 denotes a rim, and 3 denotes a disk formed integrally with the rim 1.

Further, the disk portion 3 has a plurality of hubs having a hub hole 4 at the center and a nut seat 5a at an opening edge on the disk surface side at circumferentially uniform intervals around the hub hole 4. A porous metal body 6 having a mounting bolt hole 5 formed therein is integrally embedded. In this case, the porous metal body 6 is larger than the diameter of the hub mounting bolt hole 5 and has a hub mounting bolt hole 5 with a nut seat 5a formed in the center.

The shape of the nut seat 5a formed at the opening edge of each hub mounting bolt hole 5 formed on the porous metal body 6 on the disk surface side is shown in FIGS.
As shown in FIG. 2 (A) in which the portion A of FIG. 2 is enlarged, the surface has a flat shape, as well as a curved shape as shown in FIG. 2 (B), or FIG. )
As shown in FIG. 2, there is an inclined shape having an opening of approximately 60 degrees, and the like includes all of those shapes.

The porous metal body 6 used here may be a light alloy metal such as molten aluminum, a porous material that can be impregnated with a molten hard plastic material, or the like.
For example, Ni alloy, Ni-Cr alloy, Mg alloy and the like can be used. As a commercially available material, “Celmet” (registered trademark) manufactured by Sumitomo Electric Industries, Ltd., or the like can also be used.

As for embedding of the porous metal body 6 in the disk 3 of the lightweight wheel 1, when casting the lightweight wheel 1, the wheel hub hole 4 in the lower mold (not shown) is used.
The above-described porous metal body 6 having the bolt hole 5 formed at the center thereof is mounted in advance on the portion where the hub mounting bolt hole 5 formed in the periphery is to be formed, with the nut seat 5a side facing the front side of the wheel 1, The porous metal body 6 is impregnated with molten aluminum by casting and cast.

Further, after casting, the surface of each nut seat 5a on which the porous metal body 6 has been formed is smoothed by cutting or polishing using, for example, a grindstone or other polishing tools or a cutting tool, thereby forming a tilt nut. A lightweight wheel 1 in which the hardness of the entire hub mounting bolt hole 5 including the seat 5a is significantly improved is completed.

FIGS. 3 and 4 show a second embodiment of the present invention. Each of the hub mountings having a nut seat 5a at an opening edge on the disk surface side, which is formed at a circumferential edge portion of the hub hole 4 in the lightweight wheel 1 at a plurality of circumferentially uniform intervals along the hub hole 4. The bolt hole 5 is shown in FIG.
This is formed in a single annular porous metal body 7 as shown in FIG. 1 and is integrally embedded in the periphery of the hub hole 4.

The single annular porous metal body 7 is
It is pre-installed in the hub mounting bolt hole formed around the wheel hub hole in the lower die, and when casting with a light alloy metal such as aluminum, the porous metal body 6 is impregnated with molten aluminum and cast integrally. Shall be considered.

Therefore, the lightweight wheel 1 of the present invention is
When mounting to a vehicle hub, each hub mounting bolt hole 5 is aligned and inserted into a plurality of hub bolts protruding from the hub side, and a nut is mounted on each hub bolt protruding from each hub mounting bolt hole 5. It is attached by screwing in and tightening.

In the above embodiment, a case was described in which a light metal such as an aluminum material was used as a material for the lightweight wheel. However, as a material for the lightweight wheel, for example, glass fiber or the like may be used in plastic. The same applies to the case where a resin material such as a reinforced plastic reinforced by mixing high-strength fibers is used.In this case, when a lightweight wheel is manufactured, the resin such as the plastic is melted. By impregnating the material into the porous metal body 6 at the time of injecting the object, it can be embedded integrally.

[0019]

As described above, according to the present invention, a plurality of hub mounting bolt holes formed on the periphery of the hub hole of the wheel are provided.
A porous metal body is buried integrally with each other, and when manufacturing a wheel, when casting or injection molding a lightweight wheel made of a material such as a light alloy or a hard plastic, a wheel hub hole in the lower mold is used. In the hub mounting bolt hole formed in the periphery,
A porous metal body is mounted in advance, and the above-described porous metal body is impregnated with a molten metal or a melt of a lightweight wheel material by casting or injection molding so as to be buried integrally with each other. The surface of the nut seat of the portion is smoothed.

Therefore, the molten metal such as aluminum easily penetrates into the porous metal body, and the porous metal body is cast into the disk of the wheel or buried in the hard plastic melt. The repeated tightening of the nut with respect to the hub bolt does not cause a problem such as so-called "scraping" on the hub mounting bolt hole portion, especially the nut seat portion, which hinders smoothness, and furthermore, machining such as coining and shot blasting on the nut seat surface. The wear resistance and the strength can be remarkably improved without performing the above, and thereby the mounting accuracy to the vehicle side hub can be improved in relation to the tightening torque of the nut to the hub bolt and the axial force.

Further, a porous metal body forming a bolt hole, which is to be embedded in the disk, has a plurality of hub mounting bolts at regular intervals in the circumferential direction along the hub hole at the periphery of the hub hole of the wheel. In the case of an annular porous metal body having a hole formed therein, it is not necessary to install a plurality of nut seat porous metal bodies at regular intervals around the hub hole at the time of manufacture, and workability is significantly improved. .

[Brief description of the drawings]

FIG. 1 is a half sectional view of a lightweight wheel for an automobile according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of a hub mounting bolt hole in FIG. 1;

FIG. 3 is a half sectional view of a lightweight wheel for an automobile according to a second embodiment of the present invention.

FIG. 4 is a plan view of an annular porous metal body buried in the periphery of a hub hole of a wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light weight wheel 2 Rim part 3 Disk part 4 Hub hole 5 Hub mounting bolt hole 5a Nut seat 6 Porous metal body 7 Porous metal body

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B60B 5/02 B60B 5/02 Z

Claims (14)

[Claims] 1. A lightweight wheel for an automobile, wherein a porous metal body is integrally embedded in each of a plurality of hub mounting bolt holes formed around the hub hole of the wheel. The porous metal body integrally embedded in the hub mounting bolt hole portion is larger than the diameter of the hub mounting bolt hole, and has a hub mounting bolt hole with a nut seat formed in the center thereof. The lightweight wheel for an automobile according to claim 1. 3. An annular porous metal body having a plurality of hub mounting bolt holes formed at equal circumferential intervals along the hub hole at the periphery of the hub hole of the wheel. Lightweight wheels for automobiles. 4. The method according to claim 1, wherein the porous metal body is one of a Ni alloy, a Ni—Cr alloy and a Mg alloy.
4. A soft material wheel for an automobile according to claim 1. 5. The lightweight vehicle wheel according to claim 1, wherein the material of the lightweight wheel is aluminum or another light alloy. 6. The lightweight wheel for an automobile according to claim 1, wherein the material of the lightweight wheel is a hard plastic or other resin material. 7. A light weight for an automobile according to claim 1, wherein the burying of the porous metal body in the plurality of hub mounting bolt hole portions formed on the periphery of the hub hole is casting into an aluminum or other light alloy wheel. Type wheel. 8. The method according to claim 1, wherein the embedding of the porous metal body in the plurality of hub mounting bolt holes formed on the periphery of the hub hole is integrated by injecting a hardened plastic or other molten resin material during wheel molding. Items 1-4
And a lightweight vehicle wheel according to claim 6. 9. When casting or injection molding a lightweight wheel, a porous metal body is mounted in advance on a hub mounting bolt hole formed around a wheel hub hole in a lower mold, and the lightweight metal wheel is cast or injection molded. A lightweight automotive vehicle in which a porous metal body is impregnated with a melt or melt of a lightweight wheel material and buried, and after casting or injection molding, the surface of the nut seat at the opening of each hub mounting bolt hole is smoothed. Manufacturing method of die wheel. 10. A hub in which a porous metal body previously mounted in a hub mounting bolt hole formed around the wheel hub hole in the lower die is larger than the diameter of the hub mounting bolt hole and has a nut seat at the center. The method for manufacturing a lightweight automobile wheel according to claim 9, wherein the mounting bolt hole is formed. 11. A porous metal body mounted in advance in a hub mounting bolt hole formed around a wheel hub hole in a lower die is provided at a peripheral edge of the hub hole of the wheel at equal circumferential intervals along the hub hole. 10. The method for manufacturing a lightweight automobile wheel according to claim 9, wherein the annular porous metal body has a plurality of hub mounting bolt holes formed therein. 12. The method according to claim 9, wherein the porous metal body is one of a Ni alloy, a Ni—Cr alloy and a Mg alloy.
2. The method for producing a lightweight wheel for an automobile according to 1. 13. The method for manufacturing a lightweight wheel for an automobile according to claim 9, wherein the soft material is aluminum or another light alloy. 14. The method for manufacturing a lightweight wheel for an automobile according to claim 9, wherein the soft material is a hard plastic or another resin material.