TYRE, THE CARCASS REINFORCEMENT OF WHICH IS REINFORCED WITH A LAYER OF REINFORCING ELEMENTS IN THE BEAD REGION

摘要

The invention relates to a tyre with a radial carcass reinforcement which is made up of at least one layer of reinforcing elements which is anchored in each of the beads by being wrapped around a bead wire, said wrapped-around portion of carcass reinforcement being reinforced by at least one layer of reinforcing elements or stiffener. According to the invention, the reinforcing elements of at least one stiffener are unwrapped metal chords with saturated layers which in the test known as the permeability test return a flowrate of less than 5 cm3/mn and the thickness of the polymer compounds separating the stiffener from the end of the wrapped-around portion of carcass reinforcement is strictly less than 3.5 mm.