| 摘要 |
<p>Sudden delamination damage between a carcass and a belt layer at the end stage of wear caused by heat deterioration is suppressed. In an all steel radial structure, a reinforcing rubber layer (11) whose 100% modulus is equal to or more than 2 Mpa and equal to or less than the 100% moduli of the topping rubber of the carcass (6) and the topping rubber of the belt layer (7) and whose thickness (T) is 0.3-3.5 mm is provided between the carcass (6) and the belt layer (7). The belt layer (7) comprises a pair of working belt plies (10) which overlap each other in and outside the radial direction and in which belt cords are inclined to one side and the other side relative to a tire equator. The working belt ply (10) is set in such a manner that the bending rigidity (G) of one belt cord is in the range of 110-340 gf cm and the belt ply bending rigidity defined by (G)×(N), the product of the bending rigidity (G) and the number (N) (unit: line) of driven cords per one inch width of the working belt ply (10), is in the range of 2000-3500 gf cm.</p> |
