| 摘要 |
PURPOSE:To prevent the deviation of the center of a ground section and also a ply steering symptom by providing a troidal carcass and a ply layer and allowing the ply layer to contain a pair of plies with a cord arranged under specific conditions. CONSTITUTION:A radial tire 1 is configured by providing a troidal carcass 3 whose ends are folded around a bead core 2 and hooked and a belt layer 4 that is used outside the crown section of the carcass 3 and that is provided with a cord arranged at an angle in the circumferential direction of the tire 1 and arranging one each of auxiliary layers 6a and 6b between the belt layer 4, tread 5, and carcass 3. In addition, the belt layer 4 that functions as a breaker is comprised by laminating three-layer ply pairs 4a, 4a', 4b, 4b', and 4c, 4c' provided with a symmetrical cord angle. Besides, the said respective ply pairs cords are oriented symmetrically inserting the equatorial surface of the tire 1 and tilted in the circumferential direction of the tire 1. |
