| 摘要 |
The invention relates to improvements to the endurance of the beads of a radial tyre for a heavy vehicle of construction plant type by reducing the cracking which starts at the area of contact between a first filling polymer material (23a) radially furtherest towards the inside and in contact with the bead wire (22) and a second filling polymer material (23b) radially on the outside of the first filling polymer material. According to the invention, a transition element (24), made of a transition polymer material, is in contact, via its radially interior face (24a), with the first filling polymer material (23a) and in contact, via its radially exterior face (24b) with the second filling 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 filling polymer materials. |
