# US 10,245,900 B2 · Tire

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- Number: US 10,245,900 B2
- Document ID: US10245900B2
- Status: Granted
- Kind: B2
- Application number: 14/433,551
- Filed: 2013-10-30
- Published: 2015-08-13
- Granted: 2019-04-02
- Earliest claimed: 2012-11-07
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Yoshikazu Kibayashi
- Web page: https://patentgrep.com/patent/US10245900B2

## CPC

- B60C 15/06: Flipper strips, fillers, or chafing strips {and reinforcing layers for the construction of the bead}
- B60C 15/0027: {with low ply turn-up, i.e. folded around the bead core and terminating at the bead core}
- B60C 15/0036: {with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width}
- B60C 15/0607: {comprising several parts, e.g. made of different rubbers}
- B60C 2015/061: {Dimensions of the bead filler in terms of numerical values or ratio in proportion to section height}
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

A tire (1) in which a carcass fold-back portion (40) is wound around a bead core (10) includes a hard bead filler (50) arranged on an outer side of a carcass (20) in the tread width direction (twd), the hard bead filler (50) extends, along a tire radial direction (trd), from an outer side of the bead core (10) at least to a center (BO) of the bead core (10), and a thickness (t) of the hard bead filler (50) along the tread width direction (twd) is not shorter than 0.5 mm on a straight line (L) passing over the center (BO) of the bead core (10) in the tread width direction (twd).

## Claims

### Claim 1

A tire that includes a pair of bead cores, and a carcass that extends between the pair of bead cores, wherein the carcass includes a carcass main portion that extends between the pair of bead cores, and carcass fold-back portions that are folded back to outsides, along a tread width direction, of the pair of bead cores, respectively, and the carcass fold-back portions are wound around the bead cores, respectively, and each of the carcass fold-back portions includes a carcass outer-side end that is an outer-side distal end in a tire radial direction, the tire comprises:
a hard bead filler that is arranged on an outer side of the carcass in the tread width direction; and
a soft bead filler that is softer than the hard bead filler, the hard bead filler and the soft bead filler being completely embedded in the tire, wherein:
the hard bead filler extends, along the tire radial direction, from an outer side of the bead core at least to a center of the bead core,
the soft bead filler is located between the carcass outer-side end and the hard bead filler along the tire radial direction, such that the carcass outer-side end is separated from the hard bead filler by the soft bead filler, and
a thickness of the hard bead filler along the tread width direction is not shorter than 0.5 mm on a straight line passing over the center of the bead core in the tread width direction,
wherein:
a length, along the tire radial direction, of a region where the hard bead filler and the carcass main portion contact with each other is a contact length L,
a length, along the tire radial direction, from an outer-most surface of a tread surface that contacts with a road surface in the tire radial direction to a bead toe that is an inner-most portion of a bead portion in the tire radial direction is a tire height H, and
a ratio L/H of the contact length L to the tire height H is not smaller than 0.2 and not larger than 0.5.

### Claim 2 (depends on 1)

The tire according to claim 1, wherein
the hard bead filler contacts with the carcass main portion.

### Claim 3 (depends on 1)

The tire according to claim 1, wherein the ratio UH of the contact length L to the tire height H is not smaller than 0.3 and not larger than 0.5.

### Claim 4 (depends on 1)

The tire according to claim 1, wherein the thickness of the hard bead filler along the tread width direction is not larger than 2.5 mm on the straight line passing over the center of the bead core in the tread width direction.

### Claim 5 (depends on 1)

The tire according to claim 1, wherein the carcass outer-side end is axially inward of a radial line that intersects the center of the bead core.