| 摘要 |
Tyre intended to be fitted to a vehicle carrying heavy loads comprising a tread band (10) provided with a plurality of grooves (2) of transverse overall orientation, this tread band being characterized in that it is formed of at least three rubber materials: a first material M1, in the median part of the tread band, having a secant modulus at 10% elongation measured at a temperature of 23° C. at least equal to 4.0 MPa and hysteresis losses tan(δ)max greater than 0.19, a second material M2, on the edge parts, having a secant modulus at 10% elongation, measured at 23° C., lower than that of the first material, and a hysteresis losses value tan(δ)max lower than that of the first material and at least equal to 0.15, a third material M3, radially below the materials M1 and M2, having a hysteresis losses value tan(δ)max lower than 0.12, and furthermore, the first material M1 has a resistance to wear which is at least 15% better than that of the second and third materials, the latter two materials having substantially the same resistance to wear. |
