| 摘要 |
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 surface of contact between a first filler polymer material (23a) which is radially innermost and in contact with the bead wire core (22) and a second filler polymer material (23b) radially on the outside of the first filler polymer material. A transition element (24), made of a transition polymer material, of contact thickness (e), is in contact, via its radially internal face (24a), with the first filler polymer material (23a) and in contact, via its radially external face (24b), with the second filler polymer material (23b), and the elastic modulus at 10% elongation of the transition polymer material is somewhere between the respective elastic moduli at 10% elongation of the first and second filler polymer materials. |
