JP2004306660A - Vehicular wheel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular wheel which sufficiently reduces noise accompanied with an air column resonance caused in an air chamber of a tire, wherein a sound absorbing material is hardly peeled off, and production efficiency is improved. <P>SOLUTION: In the vehicular wheel 10 having a rim 11 for mounting a tire and the sound absorbing material 13 on an outer peripheral surface of the rim 11, the sound absorbing material 13 is constituted to be foamed rubber obtained by vulcanized-adhering a foamed rubber composition to a well part 11D formed on the rim 11. This sound absorbing material 13 is preferably formed into a shape which is continued in the peripheral direction on the well part 11D and whose section in the width direction has the center raised toward the outside in the radial direction of the rim 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle wheel having a rim for mounting a tire and a method of manufacturing the same, and more particularly, to a vehicle wheel that reduces cavity resonance in a tire and a method of manufacturing the same.
[0002]
[Prior art]
Generally, a vehicle wheel (hereinafter, referred to as “wheel”) mounted on an automobile or the like includes a wheel (hereinafter, referred to as “vehicle wheel”) in which a rim is fixedly mounted on an outer peripheral side of a disk (hereinafter, referred to as “vehicle wheel”). The tire is fixedly attached to a rim of a wheel, and a tire air chamber including an annular closed space is formed between the rim of the vehicle wheel and the tire.
[0003]
By the way, when the vehicle is running, air column resonance occurs in the tire air chamber formed between the rim of the vehicle wheel and the tire, and this air column resonance causes noise generated by the vehicle to deteriorate. It has been known. Air column resonance is a phenomenon in which random vibration transmitted from the road surface to the tire causes air in the tire air chamber to vibrate, and as a result, a resonance phenomenon occurs near the air column resonance frequency of the tire air chamber, and resonance sound is generated. It is.
[0004]
Therefore, in order to reduce such air column resonance, a vehicle wheel described in Patent Literature 1 has been conventionally proposed. The vehicle wheel according to Patent Literature 1 is configured by mounting a belt member to which a sound absorbing material is fixed by bonding or double-sided tape on an outer peripheral surface of a rim. According to this, it is assumed that the sound absorbing material absorbs the air column resonance sound, and the accompanying noise can be reduced.
[0005]
[Patent Document 1]
JP-A-6-106903 (see paragraph number (0011), paragraph number (0012) and paragraph number (0029), FIG. 6 and the like)
[0006]
[Problems to be solved by the invention]
However, in this vehicle wheel, since the sound absorbing material is fixed to the belt member with an adhesive or a double-sided tape, the sound absorbing material is not sufficiently fixed to the belt member.
[0007]
In particular, while the vehicle is running, the temperature inside the rim and the tire air chamber rises and is exposed to high temperatures, and the sound absorbing material is subjected to centrifugal force by the high-speed rotation of the vehicle wheel. As a result, there is a problem that the sound absorbing material is easily peeled off from the belt member if the fixing force of the sound absorbing material to the belt member is not sufficient.
[0008]
In addition, this vehicle wheel requires an assembling step for attaching the belt member to the rim, so that there is a problem that the production is troublesome and production efficiency is deteriorated.
[0009]
Therefore, the present invention provides a vehicle wheel and a method of manufacturing the same, which can sufficiently reduce noise caused by air column resonance generated in an air chamber of a tire, can prevent a sound absorbing material from peeling off, and can improve production efficiency. As an issue.
[0010]
[Means for Solving the Problems]
The present invention is configured to solve the above problems, and in the present invention, a rim for mounting a tire and a vehicle wheel having a sound absorbing material on an outer peripheral surface of the rim, wherein the sound absorbing material is And a foamed rubber formed by vulcanizing and bonding a foamed rubber composition.
[0011]
According to the vehicle wheel of the present invention, since the sound absorbing material is vulcanized and bonded to the outer peripheral surface of the rim, the sound absorbing material is strongly fixed to the rim and hard to peel off. In addition, since the sound absorbing material is vulcanized and bonded in this manner, a step of attaching a separately formed sound absorbing material is not required, which is economical and can improve production efficiency.
[0012]
Further, in this vehicle wheel, it is preferable that the sound absorbing material has a shape that is circumferentially continuous with a well portion formed in the rim.
[0013]
With such a configuration, the sound absorbing material can be formed in a simpler shape than in the case where the sound absorbing material is partial in the circumferential direction, and the manufacture of the vehicle wheel can be facilitated. Further, since a large surface area of the sound absorbing material can be secured, the sound absorbing effect can be improved.
[0014]
Further, in this vehicle wheel, it is preferable that a cross section of the sound absorbing material in a width direction has a shape in which a center is raised toward a radially outer side of the rim.
[0015]
With such a configuration, a larger surface area of the sound absorbing material can be ensured than in a planar cross-sectional shape, and the sound absorbing effect can be improved.
[0016]
Also, in the present invention, there is provided a method of manufacturing a vehicle wheel having a rim for mounting a tire and a sound absorbing material made of foamed rubber on an outer peripheral surface of the rim, wherein a step of fitting a mold to the outer peripheral surface of the rim is provided. And a step of filling the foam with the foamed rubber composition in the mold, and a step of vulcanizing the foamed rubber composition to foam the foamed rubber and adhere to the outer peripheral surface of the rim. It is characterized by the following.
[0017]
ADVANTAGE OF THE INVENTION According to the manufacturing method of the vehicle wheel which concerns on this invention, the foamed rubber composition is foamed and adhere | attached by filling a foamed rubber composition into the outer peripheral surface of the rim which fitted the formwork, and vulcanizing. be able to. Therefore, the vulcanizing step of the foamed rubber composition, the foaming step, and the step of bonding to the rim can be completed in one process, which is simple and economical, and improves production efficiency by reducing man-hours. be able to. In addition, by adhering the sound absorbing material to the outer peripheral surface of the rim by vulcanization, a sufficient fixing force can be obtained.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a vehicle wheel according to the present invention will be described in detail with reference to the drawings as appropriate.
[0019]
In the drawings to be referred to, FIG. 1 is a cross-sectional view showing a state where a tire is assembled to a vehicle wheel according to the present embodiment.
The vehicle wheel 10 shown in FIG. 1 is configured with the tires 20 and forms the vehicle wheel 1.
[0020]
As shown in FIG. 1, the vehicle wheel 10 includes a rim 11 for mounting a tire 20, a disk 12 for connecting the rim 11 to a hub (not shown), and a sound absorbing material 13 made of foam rubber. Be composed.
[0021]
The rim 11 is made of, for example, a light alloy such as an aluminum alloy or magnesium, or a material such as steel (steel). Rim flanges 11B, 11B bent in an L-shape. A bead portion 22A of the tire 20, which will be described later, is attached to the bead seat portions 11A, 11A, and the rim flanges 11B, 11B prevent the bead portion 22A from coming off. Further, humps 11C, 11C are formed inside the bead seat portions 11A, 11A in a slightly swelling shape from the bead seat portion 11A, and prevent the bead portion 22A from falling inside. . A well portion 11D is provided between the humps 11C and 11C to drop the bead portion 22A when the rim 11 is assembled.
[0022]
The disk 12 is provided for connection to a hub (not shown), is connected to the well 11D, and extends from the vicinity of its center toward the outside of the vehicle (hereinafter, referred to as “outer side”). The rim 11 is bent in the radial direction and is formed up to the opposed well portion (see FIG. 2). Examples of the material of the disk 12 include light alloys such as aluminum alloys and magnesium, and steel.
[0023]
The sound absorbing material 13 is formed continuously in the circumferential direction so as to cover the outer peripheral surface of the well portion 11D of the rim 11. The cross section of the sound absorbing material 13 in the width direction has a shape in which the center is raised toward the radially outer side of the rim 11. The sound absorbing material 13 is formed by foaming the foamed rubber composition 13a (see FIG. 2), and has a sound absorbing effect by having porous characteristics.
Here, foamed rubber is obtained by vulcanizing and foaming a foamed rubber composition, and foamed rubber composition is obtained by adding various additives including at least a foaming agent to an unvulcanized rubber base material. It was done. In the present embodiment, a foamed rubber composition containing ethylene-propylene-diene rubber (EPDM) as a rubber base and azodicarbonamide (ADCA) as a foaming agent is used.
[0024]
The composition of the foamed rubber composition according to the present invention is not particularly limited to the present embodiment. For example, natural rubber, acrylonitrile-butanediene copolymer rubber (NBR), chloroprene rubber (CR) ), Chlorosulfonated polyethylene rubber (CSM), isoprene rubber (IR), styrene-butadiene rubber (SBR), fluoro rubber (FKM), silicone rubber, epichlorohydrin rubber (CO, ECO), butadiene rubber (BR), butyl rubber ( IIR), acrylic rubber (ACM), urethane rubber (U) and the like can be used. These can be used alone or in combination of two or more.
Further, as the foaming agent, N, N'-dinitrosopentamethylenetetramine (DPT), 4,4'-oxybis (benzenesulfonylhydrazide) (OBSH) and the like can be used.
Further, as a vulcanizing agent, for example, sulfur, an organic sulfur-containing compound, an organic peroxide and the like can be added.
[0025]
The tire 20 includes a tire main body 21 that is in contact with a road surface (not shown), and an inner liner 22 that is attached to the entire inner circumference of the tire main body 21. The inner liner 22 has a pair of bead portions 22A, 22A, and each of the bead portions 22A is attached to the bead seat portions 11A, 11A of the rim 11 in a state of being elastically adhered thereto. For this reason, the space between the bead seat portion 11A of the rim 11 and the bead portion 22A of the inner liner 22 is hermetically sealed, and an annular closed space is formed between the rim 11 and the inner liner 22 (the inner peripheral surface of the tire). A tire air chamber 30 is formed.
Incidentally, in the present embodiment, since the sound absorbing material 13 is bonded to the well portion 11D of the rim 11 facing the tire air chamber 30, it is possible to absorb the resonance sound generated in the tire air chamber 30.
[0026]
Next, a method for manufacturing the vehicle wheel 10 will be described.
FIG. 2 is a diagram for explaining a method of manufacturing the vehicle wheel, and is a cross-sectional view in the width direction of the rim.
First, as shown in FIG. 2A, a mold 40 conforming to the shape of the above-described sound absorbing material 13 is fitted around the outer periphery of the well portion 11 </ b> D of the ready-made rim 11. Next, as shown in FIG. 2 (b), the foam rubber composition 13a described above is filled into the mold 40 fitted into the well portion 11D by injection 41. Then, by vulcanizing the foamed rubber composition 13a while applying pressure, the foamed rubber composition 13a is foamed and simultaneously adhered to the well 11D. The foamed rubber composition 13a becomes a sound absorbing material 13 which is a porous foamed rubber by being vulcanized and foamed, and a sound absorbing property can be obtained.
[0027]
According to the vehicle wheel 10 manufactured as described above, the following effects can be obtained.
In the vehicle wheel 10 according to the present embodiment, since the sound absorbing material 13 made of the foamed rubber composition 13a is vulcanized and bonded to the well portion 11D of the rim 11, the fixing force of the sound absorbing material 13 to the well portion 11D is strong. Yes, difficult to peel. In particular, even when a centrifugal force due to the rotation of the wheel 1 is applied to the sound absorbing material 13, the reliability of the fixing force of the sound absorbing material 13 is high, and the possibility of detachment from the well portion 11D is small.
[0028]
In addition, since the sound absorbing material 13 is vulcanized and bonded to the well portion 11D, the vulcanizing step of the foamed rubber composition 13a, the foaming step, and the bonding step to the rim can be completed in one process. Therefore, it is simple and economical, and the production efficiency can be improved by reducing the number of man-hours.
[0029]
In the vehicle wheel 10, the sound absorbing material 13 is vulcanized and adhered to the well portion 11D in a shape continuous in the circumferential direction, so that the vehicle wheel 10 has a simple shape and can be easily manufactured. In addition, since a large surface area of the sound absorbing material 13 can be secured, the sound absorbing effect can be improved.
[0030]
Further, in the vehicle wheel 10, the cross section in the width direction of the sound absorbing material 13 has a shape in which the center is raised toward the radially outer side of the rim 11. A large surface area of the material 13 can be secured, and the sound absorbing effect can be improved.
[0031]
In addition, since the sound absorbing material 13 is vulcanized and bonded to the well portion 11D, it does not interfere with the bead seat portion 11A of the rim 11, but is applied to the bead seat portion 11A of the tire 20 (bead portion 22A). Assembly can be facilitated.
[0032]
The present embodiment has been described above, but the present invention is not limited to this, and can be implemented in the following embodiments.
In the present embodiment, the shape of the sound absorbing material 13 of the vehicle wheel 10 is continuous with the well portion 11D in the circumferential direction. For example, as shown in FIG. 3, the sound absorbing material 13 is formed discontinuously in the circumferential direction. That is, a plurality of sound absorbing materials 131 may be partially provided. This can reduce the cost and the weight of the vehicle wheel.
[0033]
In the present embodiment, the cross section in the width direction of the sound absorbing material 13 has a shape in which the center is raised from the well portion 11D toward the radial outside of the rim 11, but the shape is limited in the present invention. Instead, the vicinity of the center may be simply a flat shape. Further, as shown in FIG. 4A, the sound absorbing material 132 having a wavy shape near the center may be formed so as to secure a larger surface area. By doing so, greater sound absorption characteristics can be obtained.
Further, as shown in FIG. 4B, a sound absorbing material 133 having a substantially rectangular shape in cross section may be vulcanized and bonded to a surface from one hump 11C to the vicinity of the center of the well portion 11D. Even in this case, the same effect as in the present embodiment can be obtained.
[0034]
In the present embodiment, a foamed rubber composition containing EPDM as a rubber base material and ADCA as a foaming agent was used. However, it is possible that the types of the rubber base material, the foaming agent, and the vulcanizing agent can be appropriately changed. Needless to say. Further, an adhesion promoter or the like may be appropriately added.
[0035]
In the present embodiment, the foamed rubber composition is directly filled into the mold fitted into the well 11D and vulcanized and bonded. For example, after the adhesive is applied to the well 11D, The rubber composition 13a may be filled and vulcanized and adhered.
[0036]
【The invention's effect】
According to the first aspect of the present invention, since the sound absorbing material is vulcanized and adhered to the rim, the sound absorbing material has a strong fixing force to the rim and is difficult to peel off. In addition, since the sound absorbing material is vulcanized and bonded to the rim, a step of mounting a separately formed sound absorbing material is not required, which is economical and can improve production efficiency.
[0037]
According to the second aspect of the present invention, the sound absorbing material can be formed in a simple shape, and the manufacture of the vehicle wheel can be facilitated. In addition, since a large surface area of the sound absorbing material can be secured, the sound absorbing effect can be improved.
[0038]
According to the invention as set forth in claim 3, since the cross section in the width direction of the sound absorbing material has a shape in which the center is raised toward the outside in the radial direction of the rim, rather than having a planar cross sectional shape, A large surface area of the sound absorbing material can be secured, and the sound absorbing effect can be improved.
[0039]
According to the fourth aspect of the present invention, the outer peripheral surface of the rim in which the mold is fitted is filled with the foamed rubber composition and vulcanized, whereby the foamed rubber composition can be foamed and bonded at the same time. . Therefore, the vulcanizing step of the foamed rubber composition, the foaming step, and the step of bonding to the rim can be completed in one process, which is simple and economical, and improves production efficiency by reducing man-hours. be able to. In addition, a sufficient fixing force can be obtained by vulcanization bonding.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where a tire is mounted on a vehicle wheel according to the present embodiment.
FIG. 2 is a diagram illustrating a method of forming a vehicle wheel.
FIG. 3 is a cross-sectional view along a rim circumferential direction of a vehicle wheel according to a modification of the present embodiment.
FIG. 4 is a cross-sectional view in a width direction of a rim of a vehicle wheel according to a modification of the present embodiment.
[Explanation of symbols]
Reference Signs List 1 wheel 10 vehicle wheel 11 rim 11A bead seat portion 11B rim flange 11C hump 12 disk 13 sound absorbing material 13a foamed rubber composition 20 tire 30 tire air chamber 40 formwork

Claims (4)

A rim for mounting a tire, a vehicle wheel having a sound absorbing material on an outer peripheral surface of the rim,
The sound absorbing material is a foamed rubber formed by vulcanizing and bonding a foamed rubber composition. 2. The vehicle wheel according to claim 1, wherein the sound absorbing material has a shape that is circumferentially continuous with a well portion formed on the rim. 3. The vehicle wheel according to claim 2, wherein a cross-section in a width direction of the sound absorbing material has a shape whose center is raised toward a radially outer side of the rim. A rim for mounting a tire, and a method for manufacturing a vehicle wheel having a sound absorbing material made of foamed rubber on an outer peripheral surface of the rim,
A step of fitting a formwork on the outer peripheral surface of the rim;
Filling the foamed rubber composition in the mold,
Vulcanizing the foamed rubber composition to form a foamed rubber and bonding the foamed rubber composition to an outer peripheral surface of the rim.

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