| 摘要 |
<p>A technique for improving the durability of the beads of a radial tire for a heavy vehicle of the civil engineering type, by reducing the rate of spread of cracks initiated at the turned-back end of carcass reinforcement and the spread through the coating, edge-binding and filler polymer materials. A transition element (25), made of a transition polymer material, is at least partially in contact, on its axially external face, with the edge-binding polymer material (22) and, on its axially internal face, with a filler polymer material (23b), the radially external (E25) and radially internal (I25) ends of the transition element are respectively radially on the outside of and radially on the inside of the end of the turned-back portion of carcass reinforcement, and the elastic modulus at 10% elongation of the transition polymer material is somewhere between the respective elastic moduli at 10% elongation of the edge-binding polymer material and of the filler polymer material with which the transition element is in contact.</p> |
