| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pneumatic radial tire suppressing a failure between a carcass folded end part and organic fiber reinforcing layers. <P>SOLUTION: At least two layers of organic fiber reinforcing layer groups 9 in which organic fiber cords are coated with a rubber material are provided at the tire width direction outside of the carcass folded end part 6a. When a tire radial direction distance from a center of gravity 51a of a bead core 51 up to the carcass folded end part 6a is Hc in a tire meridian cross sectional view in a non-load state in which the tire is mounted on a normal rim and normal internal pressure is filled, organic fiber cord density E1 of the first organic fiber reinforcing layer 91 at the tire width direction inside of the two adjacent layers of the organic fiber reinforcing layer groups 9 and organic fiber cord density E2 of the second organic fiber reinforcing layer 92 at the tire width direction outside satisfy E1<E2 in a region where two adjacent layers of the organic fiber reinforcing layer groups 9 are laminated and a region having at least 0.9×HC or more and 1.1×HC or less from the center of gravity 51a of the bead core 51. <P>COPYRIGHT: (C)2012,JPO&INPIT |
