| 摘要 |
PROBLEM TO BE SOLVED: To enhance durability of a bead part while realizing light weight. SOLUTION: In the tire, a folding/returning part 6b of a carcass ply 6A comprises a folding/returning main part 10 folded/bent along an inner side surface Si in a tire axial direction of a bead core 5, an inner surface SL in a radial direction and an outer side surface So in an axial direction; and a folding/returning sub-part 11 left from the bead core 5 and extending. The folding/returning sub-part 11 is inclined and extended toward a body part 6a at an angleθof less than 90°relative to an outer surface SU in a tire radial direction of the bead core 5 and the shortest distance La from an outer end E1 of the folding/returning sub-part 11 to an outer surface of the bead core 5 becomes 5-12 mm. A filling rubber 12 having complex modulus having elasticity E*a of 5-15 MPa is arranged in an area surrounded by the body part 6a of the carcass ply 6A and the folding/returning part 6b on the bead part 4. A bead apex 13 having a rubber composition having complex modulus of elasticity of 20-60 MPa is arranged at the outer side in a radial direction of the filling rubber 12 through the folding/returning sub-part 11. COPYRIGHT: (C)2005,JPO&NCIPI |
