Pneumatic tire

Abstract

A tire 2 comprises a tread 4, a sidewall 6, a bead 8, a carcass 10, an inner liner 12, a reinforce ply 14 and a chafer 16. The sidewall 6 is formed by a side ply 20. The side ply 20 is constituted by multiple cords which are parallel with each other and a topping rubber. In the cord, a polyester fiber, a polyethylene naphthalate fiber, a nylon fiber or an aramid fiber is used. The cord is inclined to a rotation direction of the tire 2. A ratio of a length L of the side ply 20 in a radial direction to a height H of the tire 2 is equal to or greater than 50%. The side ply may be formed by a fabric and a rubber which is impregnated in the fabric.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view showing a part of a tire according to an embodiment of the present invention,

FIG. 2 is a sectional view showing a part of a side ply of the tire in FIG. 1,

FIG. 3 is a partially cut off cross-sectional view of the tire in FIG. 1,

FIG. 4 is a sectional view showing a part of a tire according to another embodiment of the present invention, and

FIG. 5 is a sectional view showing a part of a tire according to a further embodiment of the present invention.

Claims

1. A pneumatic tire comprising a tread having an outer surface which forms a tread surface, a pair of sidewalls extending almost inwardly in a radial direction from both ends of the tread, a pair of beads extending further almost inwardly in the radial direction from the sidewalls and a carcass laid between the beads on both sides along the insides of the tread and the sidewalls, wherein the sidewall is formed by a side ply including a fiber and a rubber which covers the fiber.

2. The tire according to claim 1, wherein said fiber is a polyester fiber, a polyethylene naphthalate fiber, a nylon fiber or an aramid fiber.

3. The tire according to claim 1, wherein a length of said side ply in a radial direction is equal to or greater than 50% of a height of the tire.

4. The tire according to claim 1, wherein said side ply is constituted by multiple cords which are formed by said fiber and are parallel with each other and a topping rubber which covers the cords.

5. The tire according to claim 4, wherein said cord is inclined to a rotation direction of the tire.

6. The tire according to claim 5, wherein an angle of inclination of the cord in the sidewall at one side to the rotation direction of the tire is substantially equal to an angle of inclination of the cord in the side wall at the other side to the rotation direction of the tire.

7. The tire according to claim 1, wherein said side ply is constituted by a fabric which is formed by weaving said fiber and a rubber which is impregnated in the fabric.