| 摘要 |
<p>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 that starts on the axially exterior face of the turned-back portion and spreads through the coating and filling polymer materials. According to the invention, a transition element (28), made of a transition polymer material, is in contact, via its axially interior face, with the coating polymer material of the axially exterior face of the turned-back portion (21b) and, via its axially exterior face, with the filling polymer material (26), and the elastic modulus at 10% elongation of the transition polymer material is somewhere between the respective elastic moduli at 10% elongation of the coating polymer material and of the filling polymer material.</p> |
