| 摘要 |
A heavy duty pneumatic radial tire(21) comprising a carcass(28),a tread(25) and a belt layer(34) comprising four belt plies piled radially one above the other and containing steel cords therein. The four belt plies consist of a large belt ply(38) having a width wider than that of the other belt plies, a middle belt ply(36) arranged radially inward of the large belt ply and having steel cords arranged obliquely in the same directions as those of steel cords of the large belt ply,a first small belt ply(37) arranged between the large belt ply and the middle belt ply and having steel cords arranged obliquely in opposite directions to those of the cords of the large belt ply and having a width smaller than that of the middle belt ply,and a second small belt ply arranged radially inward of the middle belt ply and having steel cords arranged obliquely in opposite directions to those of the cords of the large belt ply and having a width smaller than that of the middle belt ply. <IMAGE> |
