| 摘要 |
PURPOSE:To improve ride comfortableness by arranging two different kinds of rubber each having its own specific coefficient of complex elasticity to the central part and the upper/lower end parts of the side wall of a tyre, respectively. CONSTITUTION:The side wall 6 of a tyre is divided into three parts: a central part 7 located in the vicinity of M corresponding to the maximum width of the tyre, an upper end part 8 connecting the central part 7 to a tread part 5, and a lower end part 9 connecting the central part 7 to a clinch-apecks 10. Rubber having a coefficient of complex elasticity of 30-50kg/cm<2> is used for the central part 7, while rubber having a coefficient of complex elasticity of 50-80kg/ cm<2> is used for both upper and lower parts 8 and 9. Height h1 of the lower end 7b of the central part 7 from the bead part 2 is set at 40-60% of the sectional height H of the tyre, while height h2 of the upper end 7a of the central part from said bead part 2 is set at 60-70% of H. With this contrivance, an intersecting angle formed by a carcass profile and the road surface becomes small, thereby enhancing absorbing/damping effect to deformation-related strain in a flex-zone so as to improve ride comfortableness. |
