| 摘要 |
<p>A pneumatic radial tire comprises a radial carcass (5) of at least one rubberized cord ply comprised of a main carcass body (5a) and a turnup portion (5b) and a stiffener rubber (7) taperingly extending between the main carcass body and the turnup portion toward an end of the tread portion (3), wherein the stiffener rubber (7) is comprised of a hard stiffener rubber member (7-1) located near to the main carcass body (5a) and a soft stiffener rubber member (7-2) located along the turnup portion (5b) over the hard stiffener rubber member, and the hard stiffener rubber member (7-1) is convexly projected toward the outside of the tire at a section of the tire in a region sandwiched between a vertical line (LV) drawn from an end (5bE) of the turnup portion (5b) to an outer surface of the main carcass body (5a) and a line segment (LH) drawn from the end (5bE) of the turnup portion up to the outer surface of the main carcass body in parallel to a rotating axial line of the tire, and a height (H) of the hard stiffener rubber member (7-1) from the outer surface of the main carcass body (5a) on a vertical line drawn from a top (P) of the convex projected portion to the outer surface of the main carcass body is maximum in a region ranging from the line segment (LH) toward the end of the tread portion (3). <IMAGE></p> |
