JP2020131867A - Vehicular wheel - Google Patents

Abstract

To easily manufacture a vehicular wheel, eliminating the need of a conventional attachment step.SOLUTION: A hollow member 24 can be embedded inside a vehicular wheel 10 by casting of the hollow member 24 manufactured individually in advance, functioning as a Helmholtz resonator and comprising a sub-air chamber SC, into a cavity 52 of a casting mold 50. Thereby, manufacturing of the vehicular wheel 10 is made easy, as well as, airtightness of the sub-air chamber SC is enhanced.SELECTED DRAWING: Figure 1

Description

The present invention relates to wheels for vehicles such as automobiles.

In the prior art, it is known that a Helmholtz resonator, which is formed separately from the wheel, is mounted on the outer peripheral surface of the well portion of the wheel.

For example, Patent Document 1 discloses a Helmholtz resonator composed of a bottom surface member, a first support portion, a second support portion, and an auxiliary air chamber. The bottom member is formed in a shape along the well portion. The first support portion raises one of the left and right ends of the bottom surface member and engages with the first engaging portion of the wheel. In the second support portion, the left and right other ends of the bottom surface member are raised larger than the first support portion and engaged with the second engaging portion of the wheel. The secondary air chamber has a communication hole that communicates with the outside, and is arranged between the first support portion and the second support portion.

Japanese Patent No. 5657309

However, the structure disclosed in Patent Document 1 requires a separate manufacturing process of the Helmholtz resonator itself in addition to the wheel manufacturing process, which causes a problem that the manufacturing is complicated and the manufacturing cost rises.

Further, in the structure disclosed in Patent Document 1, the first support portion and the second support portion of the Helmholtz resonator manufactured separately from the wheel are attached to the first engagement portion and the second engagement portion of the wheel, respectively. Installation work is required, and in addition to the Helmholtz resonator manufacturing process, an installation process is also required.

The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle wheel that can be easily manufactured while eliminating the need for a conventional mounting process.

In order to achieve the above object, the present invention is characterized in that the hollow member having an auxiliary air chamber is embedded in the cavity of the mold by casting the hollow member.

In the present invention, it is possible to obtain a vehicle wheel that can be easily manufactured while eliminating the need for a conventional mounting process.

It is a vertical sectional view along the radial direction of the vehicle wheel which concerns on embodiment of this invention. It is a transmission side view of the hollow member embedded (inserted) in the vehicle wheel shown in FIG. 1 as viewed from the rotation axis direction of the vehicle wheel. It is a vertical sectional view along the radial direction of the vehicle wheel which concerns on other embodiment of this invention. (A) to (d) are explanatory views which show the manufacturing process of the wheel for a vehicle which concerns on this Embodiment. (A) to (d) are explanatory views which show other manufacturing process of the wheel for a vehicle which concerns on this Embodiment.

Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
In each drawing, "X" indicates the wheel circumferential direction, "Y" indicates the wheel width direction, and "Z" indicates the wheel radial direction. Further, in the wheel width direction Y, the inside thereof is one side, and the outside (design surface side) is the other side. Further, the wheel width direction Y is parallel to the rotation axis direction.

As shown in FIG. 1, the vehicle wheel 10 according to the embodiment of the present invention includes a rim 12 and a disc 14 for connecting the rim 12 to a hub (not shown). The rim 12 has well portions 18 recessed toward the inside (rotation axis side) of the wheel radial direction Z between the bead sheets 16 and 16 formed at both ends in the wheel width direction Y, respectively. ..

The well portion 18 is provided so as to drop into the bead portion 22 of the tire 20 when the tire 20 is assembled to the rim 11. In the present embodiment, the well portion 18 is formed in a cylindrical shape having substantially the same diameter in the wheel width direction Y, but is not limited to this.

As shown in FIG. 1, in the vehicle wheel 10, a pair of hollow members 24, 24 functioning as Helmholtz resonators are integrally embedded inside the vehicle wheel 10 on the lower side of the bead seats 16, 16. (Insert). The pair of hollow members 24, 24 are on one side (inside) of the vehicle wheel 10 along the wheel width direction Y and on the other side (outside, design surface side) of the vehicle wheel 10 along the wheel width direction Y. They are arranged facing each other at a predetermined distance from each other. As will be described later, the pair of hollow members 24, 24 are cast and molded into the cavity of the mold when the vehicle wheel 10 is cast and molded.

Each hollow member 24 has a substantially circular cross section along the wheel radial direction Z and is composed of a hollow tube body. The pair of hollow members 24, 24 are arranged along the wheel circumferential direction X when viewed from the side in the direction of the rotation axis. Further, the pair of hollow members 24, 24 are made of a dissimilar metal material having a melting point higher than that of the metal material for manufacturing the vehicle wheel 10.

As shown in FIG. 2, each hollow member 24 has a substantially semicircular shape when viewed from the side in the direction of the rotation axis, and on one side and the other side along the wheel width direction Y, respectively, Two wheels are arranged about half a circumference along the wheel circumferential direction X. In each hollow member 24, a space portion for forming an auxiliary air chamber SC is provided. One end and the other end of each hollow member 24 along the wheel circumferential direction X are closed and sealed. In FIG. 2, the point O indicates the rotation center of the vehicle wheel 10.

Further, each hollow member 24 is formed with a hole 26 communicating with the auxiliary air chamber SC. The hole 26 communicates with the communication hole 28 formed in the vehicle wheel 10. The hole portion 26 and the communication hole 28 communicate the auxiliary air chamber SC formed inside each hollow member 24 with the tire air chamber MC formed outside each hollow member 24. Two holes 26 and two communication holes 28 are provided in each of the hollow members 24 on one end side and the other end side along the wheel circumferential direction X. The holes 26 and the communication holes 28 that are adjacent to each other when viewed from the side in the direction of the rotation axis are arranged with a separation angle of about 90 degrees along the wheel circumferential direction X. Further, a partition wall 27 (see FIG. 2) is provided in the middle portion of each hollow member 24, and is divided into two auxiliary air chambers SC and SC. In FIG. 2, the communication hole 28 formed on the vehicle wheel 10 side is not shown.

As shown in FIG. 1, the hole 26 and the communication hole 28 of the hollow member 24 arranged on one side in the wheel width direction Y are inclined so as to rise from one side toward the other in a cross-sectional view. There is. The hole 26 and the communication hole 28 of the hollow member 24 arranged on the other side in the wheel width direction Y are inclined so as to rise from the other side toward one side in a cross-sectional view.

It should be noted that each hollow member 24 is not limited to the two hollow members 24, 24 arranged along the wheel circumferential direction X. For example, a single hollow member (not shown) may be arranged in an annular shape over the entire circumference of the vehicle wheel 10. Alternatively, a plurality of hollow members (not shown) divided into two or more may be arranged along the wheel circumferential direction X, respectively. When arranging a single hollow member in an annular shape, it is preferable to arrange a partition member for dividing the inside of the tube into two auxiliary air chambers SC and SC in the intermediate portion of the single hollow member in the annular shape.

Further, the hollow member 24 may be arranged only on the other side (design surface side) of the wheel width direction Y as in the vehicle wheel 10a according to the other embodiment shown in FIG.

The vehicle wheel 10 according to the present embodiment is basically configured as described above, and the action and effect thereof will be described next.

First, a method of manufacturing the vehicle wheel 10 according to the present embodiment will be described.

4 (a) to 4 (d) are explanatory views showing a manufacturing process of a vehicle wheel according to the present embodiment.

As shown in FIG. 4A, a pair of hollow members 24, 24 manufactured separately in advance are set at predetermined positions in the cavity 52 of the casting die 50 via a positioning member (not shown). Further, the tip portion of the shaft-shaped core 54 is inserted into the hole portion 26 of the hollow member 24 to close the hole portion 26. The core 54 may be composed of, for example, a sand core containing iron sand. Further, a magnet 55 that engages with the core 54 and magnetically supports the core 54 is mounted on the cavity forming surface of the upper mold 50a. The casting die 50 is composed of, for example, an upper die 50a, a lower die 50b, a right die, and a split die divided into four by a left die. In FIG. 4, the left and right types are not shown.

Subsequently, after the casting die 50 is closed, the molten metal in which the metal is melted (see halftone dots) is injected into the cavity 52 (see FIG. 4B). After the molten metal injected into the cavity 52 has solidified, mold splitting is performed (see FIG. 4C). Further, the communication hole 28 is formed by removing the shaft-shaped core 54 from the hole 26 of the molded vehicle wheel 10 (see FIG. 4D). As a result, the production of the vehicle wheel 10 in which the pair of hollow members 24, 24 is cast inside is completed.

5 (a) to 5 (d) are explanatory views showing another manufacturing process of the vehicle wheel according to the present embodiment.

The other manufacturing process is different in that the screw member 56 is used instead of the shaft-shaped core 54. First, the screw member 56 is screwed in from the recess 58 of the upper die 50a, and the tip of the screw member 56 is inserted into the hole 26 of the hollow member 24 to close the hole 26 (FIG. 5 (a). )reference). The recess 56 of the upper die 50a is provided with a screw hole 60 at a position corresponding to the hole 26 of the hollow member 24. Subsequently, the cavity 52 is filled with molten metal (see halftone dots) (see FIG. 5B), and after the molten metal has solidified, the screw member 56 is screwed from the recess 58 of the upper mold 50a to form the hollow member 24. By pulling out the screw member 56 from the screw hole 60 of the hole 26 and the upper die 50a (see FIG. 5C), the communication hole 28 is formed (see FIG. 5D). As a result, the production of the vehicle wheel 10 in which a pair of hollow members 24 are cast inside is completed.

In the present embodiment, a hollow member 24, which is manufactured separately in advance and functions as a Helmholtz resonator and has an auxiliary air chamber SC, is cast into the cavity 52 of the casting die 50 to form a hollow member inside the vehicle wheel 10. 24 can be buried. As a result, in the present embodiment, the vehicle wheel 10 can be easily manufactured as compared with the conventional one, and the airtightness in the auxiliary air chamber SC can be improved. Further, in the present embodiment, the mounting process by retrofitting as in the conventional case is not required, and the manufacturing cost of the vehicle wheel 10 can be reduced as compared with the conventional case.

Further, in the present embodiment shown in FIG. 1, a pair of hollow members 24, 24 are arranged on both sides of the wheel width direction Y of the vehicle wheel 10 on one side and the other side, respectively, and in the wheel circumferential direction X. It is extended along. Thereby, in the present embodiment, the capacity of the auxiliary air chamber SC of each hollow member 24 can be increased to improve the muffling effect of the noise (road noise) generated by the air column resonance.

Further, in another embodiment shown in FIG. 3, the hollow member 24 is arranged only on the design surface side (other side) of the vehicle wheel 10a in the wheel width direction Y, and is arranged along the wheel circumferential direction X. It has been extended. Thereby, in another embodiment, the muffling effect can be improved while reducing the weight of the vehicle wheel 10a. The design surface side (other side) is formed thicker than the opposite side (one side), and has the advantage that the hollow member 24 can be easily embedded and sufficient rigidity and strength can be secured. ..

Furthermore, in the present embodiment, two hollow members 24 arranged on one side (the other side) of the wheel width direction Y are arranged half a circumference along the wheel circumferential direction X (see FIG. 2). Thereby, in the present embodiment, the capacity of the auxiliary air chamber SC of each hollow member 24 can be increased to improve the noise reduction effect of the noise generated by the air column resonance.

10, 10a Vehicle wheel 24 Hollow member 26 Hole 28 Communication hole SC Secondary air chamber MC Tire air chamber X Wheel circumferential direction Y Wheel width direction Z Wheel radial direction

Claims (4)

A vehicle wheel characterized in that a hollow member having an auxiliary air chamber is cast into a cavity of a mold so that the hollow member is embedded inside. In the vehicle wheel according to claim 1,
A vehicle wheel characterized in that the hollow members are arranged on both sides of the wheel width direction Y of the vehicle wheel and on both sides of the other side, and extend along the wheel circumferential direction X. In the vehicle wheel according to claim 1,
A vehicle wheel characterized in that the hollow member is arranged only on the design surface side of the wheel width direction Y of the vehicle wheel and extends along the wheel circumferential direction X. The vehicle wheel according to any one of claims 1 to 3.
The hollow member is a vehicle wheel characterized in that the hollow member is arranged half a circumference along the wheel circumferential direction X.

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