| 摘要 |
<p>Tyre comprising two beads (20) comprising an annular reinforcing structure (70) and a carcass reinforcement (60) which is anchored in the two beads by being wrapped around the annular reinforcing structure so as to form, in each bead, a main portion (62) and a wrapped-around portion (63), in which each bead comprises a bead filler (110) situated between the main portion and the wrapped-around portion of the carcass reinforcement, and an outer strip (120) positioned axially on the outside of the carcass reinforcement and of the bead filler, the bead filler (110) and the outer strip (120) being made of a rubber compound that has an elastic modulus G' less than or equal to 15 MPa and a viscous modulus G" such that: G" [MPa] = 0.2 · G' [MPa] - 0.2 MPa, the elastic and viscous moduli being measured at 23° C; in which the entity formed by the bead filler (110) and the outer strip (120) has a thickness E(r), the thickness E(r) changes as a function of the distance r such that, in the range of distances r comprised between 25 and 45% of the height H of the tyre, the variation in thickness (X) is less than or equal to - 0.25 mm/mm over at least 4% of the height H of the tyre, and in which the annular reinforcing structure has a maximum axial width DE such that the ratio (Y), where E(r)max is the maximum value of the thickness E(r), is less than or equal to 10%.</p> |
