Tire

Patent metadata

Field	Value
Publication number	US-10202008-B2
Application number	US-201515302672-A
Country	US
Kind code	B2
Filing date	Mar 27, 2015
Priority date	Apr 10, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

This tire is provided with reinforcing cord layers that reinforce a bead part. The reinforcing cord layers are such that at the bead part at the inner side of vehicle mounting, the number of layers of the reinforcing cord layers with respect to a bead filler is greater at the inner side in the direction of tire width compared to the outer side in the direction of tire width with respect to the bead filler, and at the bead part at the outer side of vehicle mounting, the number of layers of the reinforcing cord layers with respect to the bead filler is greater at the outer side in the direction of tire width compared to the inner side in the direction of tire width with respect to the bead filler.

First claim

The invention claimed is:

1. A tire in which a mounting direction to a vehicle is designated, the tire comprising:
a tread part configured to be in contact with a road surface;
a pair of bead parts including a bead core and a bead filler;
a carcass layer folded around the bead core and extended toroidally between the pair of bead parts; and
a reinforcing cord layer having a cord configured to reinforce the pair of bead part, wherein
in a vehicle inner side bead part, a number of layers in the reinforcing cord layer is larger on an inner side in a tire width direction with respect to the bead filler than on an outer side in the tire width direction with respect to the bead filler,
in a vehicle outer side bead part, a number of layers in the reinforcing cord layer is larger on the outer side in the tire width direction with respect to the bead filler than on the inner side in the tire width direction with respect to the bead filler, and
a density of the cord in the reinforcing cord layer in the vehicle outer side bead part is larger than a density of the cord in the reinforcing cord layer in the vehicle inner side bead part.

2. The tire according to claim 1 , wherein the vehicle inner side bead part has the reinforcing cord layer only at the inner side in the tire width direction with respect to the bead filler, and the vehicle outer side bead part has the reinforcing cord layer only at the outer side in the tire width direction with respect to the bead filler.

3. The tire according to claim 1 , wherein an angle of the cord against a tire circumferential direction is in a range of 20 degrees to 80 degrees.

4. The tire according to claim 1 , wherein a tire radial direction outer end part of the reinforcing cord layer is arranged in a range of 20% to 50% of a tire sectional height from a bottom surface of the bead part toward the outer side in a tire radial direction.

5. The tire according to claim 1 , wherein a length in the tire radial direction of the reinforcing cord layer in the vehicle outer side bead part is the same as a length in the tire radial direction of the reinforcing cord layer in the vehicle inner side bead part.

6. The tire according to claim 1 , wherein a length in the tire radial direction of the reinforcing cord layer in the vehicle outer side bead part is longer than a length in the tire radial direction of the reinforcing cord layer in the vehicle inner side bead part.

7. The tire according to claim 6 , wherein the tire radial direction outer end part of the reinforcing cord layer in the vehicle outer side bead part is arranged in a range of 20% to 50% of a tire sectional height from a bottom surface of the bead part toward the outer side in the tire radial direction, and
the tire radial direction outer end part of the reinforcing cord layer in the vehicle inner side bead part is arranged in a range of 15% to 40% of the tire sectional height from the bottom surface of the bead part toward the outer side in the tire radial direction.

Assignees

• Bridgestone Corp

Inventors

• Yumii Keita

Classifications

• B60C19/001

  Tyres requiring an asymmetric or a special mounting · CPC title

• B60C3/06

  asymmetric · CPC title

• B60C5/00

  Inflatable pneumatic tyres or inner tubes (B60C1/00, B60C9/00 - B60C17/00 take precedence) · CPC title

• B60C15/06

  Flipper strips, fillers, or chafing strips {and reinforcing layers for the construction of the bead} · CPC title

• B60C2015/0696

  Asymmetric bead reinforcement, e.g. arrangement of bead reinforcing layer or apex · CPC title