# US 10,245,901 B2 · Cavity noise reduction tire

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- Number: US 10,245,901 B2
- Document ID: US10245901B2
- Status: Granted
- Kind: B2
- Application number: 14/601,491
- Filed: 2015-01-21
- Published: 2015-10-29
- Granted: 2019-04-02
- Earliest claimed: 2014-04-25
- Assignees: Kumho Tire Co., Inc.
- Applicants: Kumho Tire Co., Inc.
- Inventors: Hyoungseok Kim; Jongsik Lee; Seong Jin Seo; Pyeong-Hwa Park
- Web page: https://patentgrep.com/patent/US10245901B2

## CPC

- B60C 19/002: {Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior}
- B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## 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%.

## Claims

### Claim 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 W1 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 W2 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/cm2 or more, a density of 33 kg/m3 to 45 kg/m3 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 W1 is longer than W2, 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×(W1)2+0.0475×W1.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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/cm2 to of 2.34 kgf/cm2, a density of 33 kg/m3 to 35.24 kg/m3 and an elongation percentage of 340% to 343%.

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 1)

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