| 摘要 |
<p>A pneumatic radial tire comprises a tread portion (3), a pair of sidewall portions (2), a pair of bead portions (1), a carcass (5) of at least one rubberized ply containing cords arranged in a radial direction and consisting of a main carcass body (5a) and a turnup portion (5b), a belt (6) superimposed about a crown portion of the carcass (5), and a rubber filler (7) arranged between the main carcass body (5a) and the turnup portion (5b) above the bead core (4), wherein the rubber filler (7) is composed of three different rubber stocks (7-1,7-2,7-3), and a hardest rubber stock (7-1) among these rubber stocks is arranged in at least an outer zone in the radial direction of the tire sandwiching a normal line (Lv) drawn from the turnup end (5bE) to the outer surface of the main carcass body (5a) at section of the tire and side the main carcass body (5a), and a rubber stock (7-2) having a middle hardness is arranged between the outer surface of the main carcass body (5a) and the hardest rubber stock (7-1) as a stress-mitigating rubber layer, and a softest rubber stock (7-3) is arranged along an inner surface of the turnup portion (5b). <IMAGE></p> |
