Cavity noise reduction tire

Patent metadata

Field	Value
Publication number	US-10245901-B2
Application number	US-201514601491-A
Country	US
Kind code	B2
Filing date	Jan 21, 2015
Priority date	Apr 25, 2014
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A cavity noise reduction tire comprises a tread portion, a bead assembly being disposed at each side of the tread portion, and a sidewall portion for connecting the tread portion and the bead assembly. The tire has a ratio of the cross-sectional area of the sound-absorbing material to the cross-sectional area of the space formed by the internal surface of the tire which is to be about 23-29%.

First claim

What is claimed is:

1. A cavity noise reduction tire comprising:
a tread portion, a bead assembly being disposed at each side of the tread portion, and a sidewall portion for connecting the tread portion and the bead assembly; and
a sound-absorbing material attached to an inner side of the tread portion of the tire,
wherein a ratio of a cross-section area B of the sound-absorbing material with respect to a cross-section area (A+B) of a space formed by an inner surface of the tire ranges from 23% to 29%,
a left-to-right width W 1 of a lower end of the sound-absorbing material is 55% of a maximum left-to-right width SW of the tire,
a left-to-right width W 2 of an upper end of the sound-absorbing material is 50% of the maximum left-to-right width SW of the tire,
the sound-absorbing material is formed of a porous polyurethane foam having an elasticity of not less than 20% as measured according to JIS K 6401,
the sound-absorbing material has a tensile strength of 2.3 kgf/cm 2 or more, a density of 33 kg/m 3 to 45 kg/m 3 and an elongation percentage of 340% or more, thereby reducing a cavity noise and enhancing a low temperature durability,
a vertical slope is formed at a lower portion of a side of the sound-absorbing material, and a slanted slope is formed extending from the vertical slope at an upper portion of the side of the sound-absorbing material such that W 1 is longer than W 2 , and
a plurality of grooves are formed on a top of the sound-absorbing material, each of the grooves extending in a direction parallel to a circumference of the tire, wherein each of the grooves is an arc shape having a radius determined by the following equation:
R= 0.0005×( W 1) 2 +0.0475× W 1.

2. The cavity noise reduction tire according to claim 1 , wherein an area of the sound-absorbing material being in contact with the inner side of the tread portion has a closed-cell structure.

3. The cavity noise reduction tire according to claim 2 , wherein the sound-absorbing material is installed at the inner side of the tread portion using a double-sided adhesive tape.

4. The cavity noise reduction tire according to claim 1 , wherein compression and restoration of the sound-absorbing material are repeated while driving.

5. The cavity noise reduction tire according to claim 1 , wherein:
the sound-absorbing material is formed of a porous polyurethane foam having an elasticity of 20% to 25% as measured according to JIS K 6401, and
the sound-absorbing material has a tensile strength of 2.3 kgf/cm 2 to of 2.34 kgf/cm 2 , a density of 33 kg/m 3 to 35.24 kg/m 3 and an elongation percentage of 340% to 343%.

6. The cavity noise reduction tire according to claim 5 , wherein the plurality of grooves comprises at least four grooves.

7. The cavity noise reduction tire according to claim 1 , wherein the plurality of grooves comprises at least four grooves.

Assignees

• Kumho Tire Co Inc

Inventors

• Kim Hyoungseok
• Lee Jongsik
• Seo Seong Jin
• Park Pyeong-Hwa

Classifications

• B60C19/002 Primary

  Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior · CPC title

• B60C1/00

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title