Flexible polyurethane foam for tires, noise reducing device and tire
a technology tires, which is applied in the field of flexible polyurethane foam for tires, can solve the problems of cavity resonance, damage such as chips and cracks in the urethane foam, and it is not desirable to attach a member having a high density, so as to reduce damage, reduce noise, and reduce nois
Inactive Publication Date: 2009-02-26
THE YOKOHAMA RUBBER CO LTD +1
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Benefits of technology
[0009]The flexible polyurethane foam for tires of the present invention makes it possible to effectively suppress damages, such as chips and cracks, and deformation, such as compression (permanent set in fatigue), even when attached to a gap between a tire and a wheel rim, in particular, to an inner face of a tire by using a band member.
[0010]Since the flexible polyurethane foam for tires of the present invention is light in weight, a tire to which the polyurethane foam is attached does not impair a fuel cost performance and a traveling stability of a car.
Problems solved by technology
In a pneumatic tire, one of the causes of noise generation is cavity resonance caused by vibrations of air filled in the inside of the tire.
However, damages such as chips and cracks tend to occur in the urethane foam.
It is not desirable to attach a member having a high density, that is, a heavy weight, to an inner face of a tire from viewpoints of fuel costs and traveling stability.
However, when the band member is used, a problem of chips, cracks or the like tends to occur frequently in the sound absorbing material.
Method used
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example 1
[0054]Commercially available polyurethane foam (“Kuralafoam 281”, made by Kurabo Industries Ltd.) was used. The flexible polyurethane foam was cut into 12 pieces so that twelve board-shaped polyurethane foams having a size of 150 mm in width×20 mm in thickness×140 mm in length were prepared.
[0055]Next, a noise reducing device of a type shown in FIG. 2(C) was manufactured. Specifically, twelve board-shaped polyurethane foam members are placed at predetermined positions of a string-shaped band member (20 mm in width×2 mm in thickness×Tire inner circumferential length) made from polypropylene, with equal intervals, and fixed thereto by using a bonding agent (Super X: made by Cemedine Co., Ltd.), and the two ends of the string-shaped band member were connected to each other through fusion splicing.
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The present invention is to provide a flexible polyurethane foam for tires that can effectively suppress damages, such as chips and cracks, and deformation, such as compression (permanent set in fatigue), even when attached to an inner face of a tire by using a band member.
A flexible polyurethane foam for tires 5 which is attached to a gap between a tire and a wheel rim, wherein a density is in the range from 7 to 40 kg/m3 and a tear strength (N/cm) per unit density (kg/m3) is 0.30 or more, a noise reducing device with the flexible polyurethane foam for tires 5 fixed to a ring-shaped band member, and a tire 10 with the noise reducing device attached thereto.
Description
TECHNICAL FIELD[0001]The present invention relates to a flexible polyurethane foam for tires which is attached between a tire and a wheel rim, and in particular, relates to a flexible polyurethane foam for tires which is attached to an inner face of a tire by using a band member, a noise reducing device and a tire.BACKGROUND ART[0002]In a pneumatic tire, one of the causes of noise generation is cavity resonance caused by vibrations of air filled in the inside of the tire. This cavity resonance is generated when, upon rolling a tire, a tread portion is vibrated by irregularities of a road surface, and the vibration of the tread portion vibrates air inside the tire.[0003]With respect to a method for reducing noise due to such a cavity resonance phenomenon, a method has been proposed in which a sound absorbing material is placed in a cavity portion formed between a tire and a wheel rim (Patent Documents 1 and 2). Specific examples of sound absorbing materials include urethane foam, sou...
Claims
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IPC IPC(8): E04B1/74
CPCY10T428/24992B60C19/002B60C5/00B60C5/08
Inventor TANNO, ATSUSHITSUJIMOTO, HIROYUKI
Owner THE YOKOHAMA RUBBER CO LTD
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