Pneumatic tire
AssigneeBridgestone Corporation
InventorYosuke Mori
Life of this patent
Estimating the term…
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.
Claims5
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.
Dependencies are inferred from the claim text.