| 摘要 |
A radial tire for trucks and buses which includes a belt layer whose steel cords are disposed at an angle of 15 DEG to 25 DEG relative to the circumferential direction of the tire and a carcass layer whose cord material is selected from materials having a K value equal to 10 to 15 as calculated by the equation K=E/T, where E is the tensile modulus of the cord material in kg/mm2 and T is the breaking strength per unit area of the cord material in kg/mm2. In accordance with various disclosed embodiments, the belt layer may be a three ply structure with the outer two plies substantially parallel with one another to provide a higher resistance to shock bursts; separation in such a belt layer may be further restrained by making the sum of the cord end counts per unit width of the second and third plies 1.50 to 1.80 times as large as the cord end count per unit width of the first ply, and/or by reducing the diameters of the cords in the second and/or third plies relative to the diameter of the first ply cords. |
