Patent ID: 8662128
Filing Date: 2014-03-04
Classification: B60C,Y10T

Abstract:
1. A heavy duty tire, comprising: a tread portion, a pair of sidewall portions, a pair of bead portions each with a bead core therein, a carcass made of carcass cords and extending between the bead portions through the tread portion and the sidewall portions, and a belt disposed radially outside the carcass in the tread portion, wherein the belt comprises: the first belt ply is made of belt cords laid at an angle θ the second belt ply is made of belt cords laid at an angle θ the third belt ply is made of belt cords laid at an angle θ with respect to the tire equator, the belt cords of the second belt ply are inclined oppositely to the belt cords of the first belt ply, with respect to the tire equator, the belt cords of the third belt ply are inclined to the same direction as the belt cords of the second belt ply, the difference |θ the difference |θ the axial widths W ply strengths S S 1.0>S wherein, when measured at the axial edges of the third belt ply, the radial cord spacing (da wherein, when measured in a part of the third belt ply between axial edge portions of the third belt ply, the radial cord spacing (da wherein, when measured at the tire equator, a radial cord spacing (db) between the belt cords of the second belt ply and the belt cords of the first belt ply is in a range of from 0.3 to 1.5 mm, and wherein, when measured at the tire equator, a radial cord spacing (h) between the belt cords of the first belt ply and the adjacent carcass cords of the carcass is more than a radial cord spacing (db) between the belt cords of the second belt ply and the belt cords of the first belt ply.