| 摘要 |
<p>PURPOSE:To increase the vertical and lateral spring constants of a tire respectively, and loosen the rolling and pitching by disposing a reinforcement layer with which cords cross adjacent to the outer side of a radially disposed carcass covering from one side of a buttress part to the other side. CONSTITUTION:A tire is provided with a carcass 3 disposed at an angle thetaa of 70 deg.-90 deg. to the tire circumference and folded about bead cores 2 at both ends, a belt layer 4 disposed on its outer side, and bead apexes 5 extending between a main body part and the folded part of the carcass 3. A reinforcement layer 6 is provided between the carcass 3 and the belt layer 4 adjacent to the carcass 3 to extend to the buttress part 11. For the reinforcement layer 6, an angle thetab of the cords of the tire circumference at 10 deg.-40 deg., a crossing angle thetac with the carcass cords at 30 deg.-60 deg., and a radial height H from a bead base B at 0.3-0.6 times of a tire sectional height (h) are set respectively.</p> |
