# US 8,464,769 B2 · Pneumatic tire

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- Number: US 8,464,769 B2
- Document ID: US8464769B2
- Status: Granted
- Kind: B2
- Application number: 12/744,836
- Filed: 2008-08-22
- Published: 2010-12-23
- Granted: 2013-06-18
- Earliest claimed: 2007-12-07
- Assignees: Sumitomo Rubber Industries, Ltd.
- Applicants: Nobuyoshi Yoshinaka; Masahiro Hanya
- Inventors: Nobuyoshi Yoshinaka; Masahiro Hanya
- Web page: https://patentgrep.com/patent/US8464769B2

## CPC

- B60C 9/2204: {obtained by circumferentially narrow strip winding}
- B29D 30/3028: {by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum axis, to form an annular element (winding and joining, helically in general B29C53/58)}
- B29D 30/60: by winding narrow strips
- B60C 11/005: {with cap and base layers}
- B60C 11/0058: {with different cap rubber layers in the axial direction}
- B60C 11/0066: {having an asymmetric arrangement}
- B60C 19/001: {Tyres requiring an asymmetric or a special mounting}
- B60C 2009/2223: {with an interrupted zero degree ply, e.g. using two or more portions for the same ply}
- B60C 2009/2261: {Modulus of the cords}
- B60C 2009/2295: {with different cords in the same layer}
- B60C 2011/0025: {Modulus or tan delta}
- Y10T 152/10801: Structure made up of two or more sets of plies wherein the reinforcing cords in one set lie in a different angular position relative to those in other sets
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A proper balance between ride comfort, steering stability, and road noise is achieved. A pneumatic tire (1) has a band layer (9) comprising a band ply (9A) where band cords are arranged at an angle of not more than 5 deg. with respect to the circumferential direction of the tire on the radially outer side of a belt layer (7). The band ply (9A) comprises a first ply piece (9a) covering only one side of end portions of the belt layer (7) and a second ply piece (9b) disposed adjacently to the first ply piece (9a), covering continuously the central portion of the belt layer (7) and another side of the end portions, and having a width larger than that of the above-mentioned first ply piece (9a). And, the band cords of said first ply piece (9a) and band cords of said second ply piece (9b) are different in modulus.

## Claims

### Claim 1

A pneumatic tire comprising
a toroidal carcass extending from a tread portion to a bead core in each bead portion through each sidewall portion,
a belt layer made of at least two belt plies arranged in the radially outer side of the carcass and inside the tread portion and having belt cords arranged at an angle of 15 to 40 deg. with respect to the tire equator,
a band layer made of a band ply arranged in the radially outer side of said belt layer and having band cords arranged at an angle of not more than 5 deg. with respect to the circumferential direction of the tire, and
a tread rubber arranged in the radially outer side of said band layer,
characterized in that
(a) said band ply comprises a first ply piece covering only one side of end portions of said belt layer and a second ply piece disposed adjacently to the first ply piece, covering continuously the central portion of said belt layer and another side of the end portions, and having a width larger than that of said first ply piece;
(b) a modulus of the band cords of said first ply piece is larger than that of the band cords of said second ply piece, and
(c) said tread rubber is composed of (i) a first rubber portion arranged on an outer side of said first ply piece in the radial direction of the tire and (ii) a second rubber portion, having a hardness different from that of said first rubber portion, arranged on an outer side of said second ply piece in the radial direct of the tire, wherein said first rubber portion is harder than said second rubber portion.

### Claim 2 (depends on 1)

The pneumatic tire as set forth in claim 1, wherein a ratio (m1/m2) between a modulus m1 of the band cords of said first ply piece and a modulus m2 of the band cords of said second ply piece is more than 1.0 and not more than 7.0.

### Claim 3 (depends on 1)

The pneumatic tire as set forth in claim 1, wherein a difference (h1−h2) between a hardness h1 of said first rubber portion and a hardness h2 of said second rubber portion is 2 to 10 deg.

### Claim 4 (depends on 1)

The pneumatic tire as set forth in claim 1, wherein the value of the difference (h1−h2) between the hardness hl of said first rubber portion and the hardness h2 of said second rubber portion is larger than the ratio (m1/m2) between the modulus ml of the band cords of said first ply piece and the modulus m2 of the band cords of said second ply piece.