| 摘要 |
PURPOSE:To improve stiffness in the tire width direction and reduce a vibration amplitude due to roughness of a road face in a tread center part, so as to reduce a noise during loaded rotational movement by increasing a thickness of the tire circumference directional side wall part, gradually toward. the block width directional center part, in each of the blocks in a tread center part. CONSTITUTION:Intersection angles alphaA, alphaB, alphaC, between extension lines of side walls 3b, 3c, 4b and a tread face or normal lines on a block surfaces are increased gradually toward the width direction center part, of each of blacks 3a, 4a, and thickness of each of the side walls 3b, 3c, 4b is increased toward the center part of the blocks 3a, 4a. In this way, the block side walls 3b, 3c, 4b increase the tire width direction stiffness of each of the blocks 3a, 4a, and consequently, vibration in the tire width direction is suppressed and generated noise can be reduced effectively. |
