| 摘要 |
<p>The invention relates to improving the endurance of the beads of a radial tire for a heavy civil engineering vehicle, by reducing the propagation rate of cracks initiated at the radially innermost contact surface between a first polymer fill material (23a) in contact with the bead wire core (22) and a second polymer fill material (23b) radially outside the first polymer fill material. According to the invention, a transition element (24), consisting of a polymer transition material and having a constant thickness (e), is in contact, on the radially inner surface (24a) thereof, with the first polymer fill material (23a) and in contact, on the radially outer surface (24b) thereof, with the second polymer fill material (23b), and the modulus of elasticity of the polymer transition material at 10% extension is between the respective elastic moduli of the first and second polymer fill materials at 10% extension.</p> |
