Pneumatic tire

Patent metadata

Field	Value
Publication number	US-10518586-B2
Application number	US-201515305100-A
Country	US
Kind code	B2
Filing date	Apr 15, 2015
Priority date	Apr 25, 2014
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A pneumatic tire includes a carcass, a tread portion and a belt layer having a first inclined belt ply, circumferential direction belt ply, and second inclined belt ply. Ground contact edge side belt plies extend from tire width direction end portions of the second inclined belt ply toward tire width direction outsides, at a tire radial direction outside of the carcass. With respect to a tire circumferential direction, an angle of cords of the first inclined belt ply is from 45° to 60°, an angle of a cord of the circumferential direction belt ply is 5° or less, an angle of cords of the second inclined belt ply is from 30° to 60°, and an angle of cords of the ground contact edge side belt plies exceeds 5° and is 30° or less. A distance dimension of the ground contact edge side belt plies is 80% or more of a ground contact width.

First claim

The invention claimed is:

1. A pneumatic tire comprising:
a carcass that spans from one bead portion to another bead portion;
a tread portion that is disposed at a tire radial direction outer side of the carcass and that contacts a road surface; and
a belt layer that includes
a first inclined belt ply that is disposed inside the tread portion at the tire radial direction outer side of the carcass and that includes a plurality of cords set at an angle of from 45° to 60° with respect to a tire circumferential direction,
a circumferential direction belt ply that is disposed at the tire radial direction outer side of the first inclined belt ply, that includes a cord wound in a spiral shape and set at an angle of 5° or less with respect to the tire circumferential direction, and that is formed with a narrower width than the first inclined belt ply,
a second inclined belt ply that is disposed at the tire radial direction outer side of the circumferential direction belt ply, that is inclined in an opposite direction to an inclination of the cords of the first inclined belt ply with respect to the tire circumferential direction, that includes a plurality of cords set at an angle of from 30° to 60° with respect to the tire circumferential direction, and that is set with a width wider than that of the circumferential direction belt ply, and
a pair of ground contact edge side belt plies: (1) that extend from at least both tire width direction end portions of the second inclined belt ply toward tire width direction outer sides, (2) that extend further toward the tire width direction outer sides than an 80% position of a ground contact width of the tread portion, (3) that include a plurality of cords set at an angle that exceeds 5° and is less than 30° with respect to the tire circumferential direction, (4) that are overlapped with each portion, of the second inclined belt ply, which is wider than the circumferential direction belt ply, (5) that are disposed apart from the circumferential direction belt ply in a tire width direction, and (6) that have outer end portions in the tire width direction that are disposed farther in a tire radial direction outer side than outer end portions of the first inclined belt ply in the tire width direction,

wherein the first inclined belt ply, the circumferential direction belt ply, the second inclined belt ply, and the ground contact edge side belt plies are disposed in this sequence from the tire radial direction inside, and a distance dimension between a width direction outer side end of the ground contact edge side belt ply on one side of the tire equatorial plane and a width direction outer side end of the ground contact edge side belt ply on the other side of the tire equatorial plane is set within a range of from 105% to 130% of the width of the second inclined belt ply.

2. The pneumatic tire of claim 1 , wherein the cords of the first inclined belt ply and the cords of the second inclined belt ply are inclined in opposite directions to each other with respect to the tire circumferential direction.

3. The pneumatic tire of claim 1 , wherein the cord of the circumferential direction belt ply is an extendable cord that has elongation properties of from 4.5% to 5.5% elongation at break.

4. The pneumatic tire of claim 1 , wherein:
a part of each of the ground contact edge side belt plies contacts the second inclined belt ply; and
the ground contact edge side belt plies are disposed in a region of from 60% to 105% of the ground contact width.

5. The pneumatic tire of claim 1 , wherein an aspect ratio is 65% or lower.

Assignees

• Bridgestone Corp

Inventors

• Mori Yosuke

Classifications

• B60C2009/2093

  Elongation of the reinforcements at break point · CPC title

• B60C9/28

  characterised by the belt or breaker dimensions or curvature relative to carcass (B60C9/30 takes precedence) · CPC title

• B60C2009/2219

  with a partial zero degree ply at the belt edges - edge band · CPC title

• B60C2009/2019

  comprising cords at an angle of 30 to 60 degrees to the circumferential direction · CPC title

• B60C2009/2096

  Twist structures · CPC title