| 摘要 |
<p>PURPOSE:To raise the durability of a bead cart, by setting the dynamic storage elastic modulus of a hard stiffener at 25 deg.C as being in the range of 3.0X10<8>-5.0X10<8>dyn/cm<2>, and specifying<v it to the dynamic storage elastic modulus at 80 deg.C. CONSTITUTION:In the meridian section of a tire, a hard stiffener 52 accounts for 10-50% of the entire stiffener 5, and is in the range of contact length n=1/34/3Xl, between l hard stiffener 52 and a tire inside carcass ply 1, to the distance 1 between the start point of contact between the carcass folded part 2 and the hard stiffener 52, and the carcass folded end. Moreover, the dynamic storage elastic modulus of the hard stiffener 52 E25 at 25 deg.C is in the range of 3.0X10<8>-5.0X10<8>dyn/cm<2>, and the relation between the dynamic storage elastic modulus E25 at 25 deg.C and the dynamic storage elastic modulus E80 at 80 deg.C is E80/E25>=0.70.</p> |
