| 摘要 |
PURPOSE:To enhance the rolling resistance of a tire without deteriorating the separation-resistivity of the end section of a belt, by covering the end part of a reinforcing belt layer with a cover obtained by covering heat-shrinkable cords with a rubber, and as well by appropriately changing the radiation surface profile of a carcass. CONSTITUTION:Denoting, as B, the crossing point at which a line, in parallel with the tire rotating axis, passing through a departing point A with respect to the outer surface of the flange 9 bead part of a rim 8 intersects the carcass line, and, as C, the terminal point of a line perpendicularly extending from the crossing point B to the carcass line, a ratio R/R' between the radius R' of an imaginary reference circle having a line BC as its chord and the radius R of curvature of a shoulder section contour curve passing through the terminal point C of the carcass line is set at a value of 0.65 to 0.85. Further, the maximum distance (f) of the remaining part of the carcass line having an inflection point between the point at which the carcass line is contiguous with the above- mentioned curve and the crossing point B from the reference circle arc, is set at a value of 5 to 10mm.. Further, the end section of a belt which is embeded in the tread section is covered with a cover obtained by covering heat-shrinkable cords with a rubber. |
