JP2002293103A - Aluminum wheel for large-sized vehicle and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a danger of causing fretting cracks by enhancing strength of a nut seat surface formed on a flat hub mounting surface of an aluminum wheel for a large-sized vehicle and at an opening edge of a hub mounting hole or to improve mounting accuracy on a vehicle side hub. SOLUTION: Annular ceramic mesh ring bodies corresponding to the shape of the nut seat surface are cast into portions corresponding to nut seats formed on an annular ceramic mesh plate and at an opening edge part of each hub mounting bolt hole on at least one side surface of the flat hub mounting surface with a hub hole as a center in a wheel disc. Therefore, strength of the hub mounting surface is remarkably improved, although the surface is made of a comparatively soft aluminum material, and impairing of exactness of mounting of the wheel by generation of fretting cracks due to a secular use and impairing of smoothness of the nut seat is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum wheel used as a wheel of a large vehicle such as a large truck or a bus, and a method of manufacturing the same. It is another object of the present invention to improve the wear resistance and strength of the tightening nut seat with respect to the hub mounting bolt, thereby improving the mounting accuracy with respect to the vehicle-side hub.

[0002]

2. Description of the Related Art In recent years, the use of aluminum wheels has tended to increase in the field of large vehicles due to demands for lightening and aesthetics of vehicles. Also, aluminum wheels for large vehicles are provided with about 6 to 8 hub mounting bolt holes at equal intervals around the periphery of the hub hole, and these hub mounting bolt holes are projected from the vehicle side hub. After the wheels are mounted in alignment with the plurality of hub bolts, the wheels are mounted by screwing nuts into the hub bolts protruding from the hub mounting bolt holes.

[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 the brake drum is inspected. From a soft place, fretting cracks are likely to occur on the flat hub mounting surface, or cracks are likely to occur on the inclined nut seat surface at the opening edge of the bolt hole due to repeated tightening of the nut each time the wheel is attached or detached.

In the past, a flat hub mounting surface was formed by forging working between the hub mounting bolt holes on the hub mounting surface or dishing, coining, or shot blasting on the hub mounting surface. Hardened, burnishing and coining are applied to the nut seating surfaces of the plurality of hub mounting bolt holes formed on the hub mounting surface,
Alternatively, the diameter of the hub mounting bolt hole is formed large in advance, and an insert member having an inclined nut seat made of a hard material such as iron or various alloys is press-fitted into the hub mounting bolt hole. The aim was to improve the mechanical strength.

[0005]

However, since the hub mounting surface is made of aluminum, when the portion is subjected to various processes such as dishing and coining, the material of the portion is made of aluminum. Therefore, the effect is not so large and it is not practical because it takes too much man-hour and labor. Further, the same effect is not obtained when coining is performed on each nut seat surface, and a large effect is not obtained.When using an insert member having an inclined nut seat, a mold and a hard material for molding are separately required. In addition to this, an additional step of inserting into the hub mounting bolt hole is required, so that an increase in cost is inevitable.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and has a remarkable surface hardness at a hub mounting surface and a nut seat portion of a bolt hole formed in the portion at a low cost. An aluminum wheel for a large vehicle that can be improved is provided. Specifically, at least one side of a flat hub mounting surface centered on a hub hole in a wheel disc has an annular ceramic. The present invention relates to an aluminum wheel for large vehicles, wherein a mesh plate is cast.

Further, according to the present invention, an annular ceramic mesh ring corresponding to the shape of the nut seat surface is cast on the nut seat formed at the opening edge of each hub mounting bolt hole of the hub mounting surface. The invention relates to an aluminum wheel for a large vehicle in which it is embedded.

Further, according to the present invention, when an aluminum wheel is cast, an annular ceramic mesh plate is previously mounted at a position corresponding to at least one surface of a hub mounting surface centered on a hub hole of a wheel disk in a lower die. The present invention relates to a method for manufacturing an aluminum wheel for a large vehicle, wherein the annular ceramic mesh plate is impregnated with molten aluminum by casting and cast, and the surface of the portion provided with the annular ceramic mesh plate after casting is smoothed. .

[0009] The present invention further provides a ring-shaped ceramic mesh plate previously mounted at a position corresponding to at least one surface of a flat hub mounting surface centered on the hub hole of the wheel disk in the lower die. Holes corresponding to the hub hole and the hub mounting bolt hole of the disc are respectively opened, and at the portion corresponding to the nut seat formed at the opening edge of each hub mounting bolt hole, the shape of the nut seat surface is used. The present invention relates to a method for manufacturing an aluminum wheel for a large vehicle in which a corresponding annular ceramic mesh ring is mounted.

[0010] In the above configuration, the flat hub mounting surface centered on the hub hole in the wheel disc,
At least on one side, the hub mounting surface is markedly hardened from where the annular ceramic mesh plate is cast, greatly reducing the risk of cracking in that portion. Further, the annular ceramic mesh ring corresponding to the shape of the nut seat surface is cast into the nut seat formed at the opening edge of each hub mounting bolt hole on the hub mounting surface. Thus, it is possible to obtain an aluminum wheel having a nut seat surface portion having high hardness.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the present invention will be described below with reference to the embodiments shown in FIGS. 1 to 4. In the drawings, reference numeral 1 denotes an aluminum wheel for a large vehicle cast from an aluminum alloy. 2 denotes a rim portion, and 3 denotes a disk portion formed integrally with the rim portion 1. Further, the disk portion 3 has a hub hole 4 in the center, and an annular ceramic mesh plate 6 is cast on a flat hub mounting surface centered on the hub hole 4.

The annular ceramic mesh plate 6
Is formed into a donut-shaped porous plate which is knitted vertically and horizontally by ceramic fibers, and has hub holes 4 of the wheel disc portion 3 and hub mounting bolts formed around the hub holes 4. Hole 7 corresponding to hole 5
Has been established respectively. Further, the nut seat formed on the opening edge portion of each hub mounting bolt hole 5 on the hub mounting surface is made of the same material as the ceramic mesh plate 6 and is made of porous material corresponding to the shape of the nut seat surface. Annular ceramic mesh rings 8 are cast respectively.

In this case, the ceramic mesh ring 8 cast into the nut seat portion at the opening edge of each hub mounting bolt hole 5 generally corresponds to the shape of the inclined nut seat surface of the hub mounting bolt hole 5. It has a substantially trapezoidal shape with the upper and lower surfaces open.

Next, the procedure for casting the ceramic mesh plate 6 and the ceramic mesh ring 8 into the hub mounting surface will be described. When casting an aluminum wheel, the center of the hub hole 4 of the wheel disk in the lower die (not shown) is used. At positions corresponding to both sides of the flat hub mounting surface, an annular ceramic mesh plate 6 is formed in advance, and at positions corresponding to the nut seats formed at the opening edges of the respective hub mounting bolt holes 5, the nut seating surfaces are formed. After mounting the annular ceramic mesh ring 8 corresponding to the shape (see FIG. 4), the annular ceramic mesh plate 6 and the ceramic mesh ring 8 are impregnated with molten aluminum by casting and cast. Each surface is smoothed using a known cutting tool or polishing device. To complete Te.

In the above-described embodiment, the case where the ceramic mesh plate 6 and the ceramic mesh ring 8 are cast on both sides of the flat hub mounting surface has been described. Even if it is applied, a certain effect can be obtained.

Therefore, the aluminum wheel 1 of the present invention
In the case of mounting on a hub of a large vehicle, each hub mounting bolt hole 5 is positioned and inserted into a plurality of hub bolts (not shown) projecting from the hub side. It is attached by screwing a nut into the hub bolt and tightening.

[0017]

As described above, according to the present invention, an annular ceramic mesh plate is provided on at least one side of a flat hub mounting surface centered on a hub hole in a wheel disc.
Since the annular ceramic mesh ring 8 corresponding to the shape of the nut seat surface is cast into the portion corresponding to the nut seat formed at the opening edge of each hub mounting bolt hole 5, the comparison is made. Despite being a soft aluminum material, the strength of the hub mounting surface is remarkably improved, and there is no possibility of fretting cracks occurring due to use over time.

[0018] In addition, repeated tightening of the nuts each time the wheel is attached or detached hardly causes cracks in the inclined nut seat surface of the opening edge of the hub mounting bolt hole, or a problem such as so-called "galling" which hinders smoothness. Accuracy of wheel attachment is not impaired due to the relationship between the tightening torque of the nut on the hub bolt and the axial force.

Further, as in the prior art, forging processing is performed between hub mounting bolt holes on the hub mounting surface, dishing, coining, or shot blasting is performed on the hub mounting surface. Burnishing or coining is applied to the nut seat surface of the inclined hub mounting bolt hole, or the diameter of the hub mounting bolt hole is formed to be large in advance, and iron or various alloys, etc. are formed in the hub mounting bolt hole. There is no need to press-fit an insert member with an inclined nut seat, which is made of a harder material, to partially improve the strength.This can only reduce man-hours and significantly reduce production costs. Not to be achieved by conventional technology It has become possible to achieve a durability improvement.

[Brief description of the drawings]

FIG. 1 is a front view of an aluminum wheel for a large vehicle according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an enlarged view of a portion X in FIG. 2;

FIG. 4 is a perspective view of an annular ceramic mesh plate and an annular ceramic mesh ring used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum wheel for large vehicles 2 Rim part 3 Disk part 4 Hub hole 5 Hub mounting bolt hole 6 Ceramic mesh plate 7 Hole 8 Ceramic mesh ring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshimasa Kimura 5-9, Yonbancho, Chiyoda-ku, Tokyo Topy Industries, Ltd.

Claims (11)

[Claims] 1. An aluminum wheel for a large vehicle, wherein an annular ceramic mesh plate is cast on at least one side of a flat hub mounting surface centered on a hub hole in a wheel disc. 2. The aluminum wheel for a large vehicle according to claim 1, wherein holes corresponding to hub holes and hub mounting bolt holes of the wheel disc are formed in the annular ceramic mesh plate. 3. An annular ceramic mesh ring corresponding to the shape of the nut seat surface is cast into the nut seat formed at the opening edge of each hub mounting bolt hole on the hub mounting surface. The aluminum wheel for a large vehicle according to claim 1 or 2. 4. A ceramic mesh ring cast into a nut seat portion at an opening edge of each hub mounting bolt hole on the hub mounting surface has upper and lower surfaces corresponding to the shape of the inclined nut seat surface of the hub mounting bolt hole. The aluminum wheel for a large vehicle according to any one of claims 1 to 3, wherein the aluminum wheel has a substantially trapezoidal shape when opened. 5. An annular ceramic mesh plate cast on at least one surface of a hub mounting surface is a porous body woven vertically and horizontally by ceramic fibers.
5. The aluminum wheel for a large vehicle according to any one of items 1 to 4. 6. A ceramic mesh ring cast in a nut seat portion formed at an opening edge of each hub mounting bolt hole of the hub mounting surface is woven vertically and horizontally by ceramic fibers, and an inclined nut seat surface of the hub mounting hole. The aluminum wheel for a large vehicle according to any one of claims 1 to 5, wherein the aluminum wheel is configured to have a substantially trapezoidal shape whose upper and lower surfaces are opened to correspond to the shape of (1). 7. When casting an aluminum wheel, an annular ceramic mesh plate is attached in advance to a position corresponding to at least one surface of a flat hub mounting surface centered on a hub hole of a wheel disc in a lower die, A method of manufacturing an aluminum wheel for a large vehicle, wherein the annular ceramic mesh plate is impregnated with molten aluminum by casting and cast, and a surface of a portion provided with the annular ceramic mesh plate after casting is smoothed. 8. An annular ceramic mesh plate previously mounted at a position corresponding to at least one surface of a flat hub mounting surface centered on a hub hole of a wheel disc in a lower die, the hub hole of the wheel disc and The method for manufacturing an aluminum wheel for a large vehicle according to claim 7, wherein holes corresponding to the hub mounting bolt holes are respectively formed. 9. An annular ceramic mesh plate previously mounted at a position corresponding to at least one surface of a flat hub mounting surface centered on a hub hole of a wheel disc in a lower die, the hub hole of the wheel disc and Holes corresponding to the hub mounting bolt holes are respectively opened, and a portion corresponding to a nut seat formed at the opening edge of each hub mounting bolt hole has an annular shape corresponding to the shape of the nut seat surface. 9. The method for manufacturing an aluminum wheel for a large vehicle according to claim 7, wherein the ceramic mesh ring is mounted. 10. The method for manufacturing an aluminum wheel for a large vehicle according to claim 7, wherein the annular ceramic mesh plate previously mounted on the lower mold is a porous body woven vertically and horizontally by ceramic fibers. . 11. The method according to claim 11, which is previously mounted on a lower mold.
An annular ceramic mesh ring corresponding to the shape of the nut seat surface is a portion corresponding to a nut seat formed on the opening edge of each hub mounting bolt hole on the hub mounting surface. The method for manufacturing an aluminum wheel for a large vehicle according to any one of claims 7 to 10, wherein the aluminum wheel has a substantially trapezoidal shape with upper and lower surfaces opened to correspond to the shape of the inclined nut seating surface.