TIRE, THE CROWN AREA OF WHICH IS PROVIDED WITH AN INNER LAYER FOR REDUCING RUNNING NOISE

摘要

The invention relates to a radial tire (1) for a motor vehicle, comprising: a crown (2) comprising a tread (3) provided with at least one radially outer portion (3a) for contacting the road; two inextensible beads (4); two sidewalls (5) connecting the beads (4) to the tread (3); a carcass reinforcement (6) extending into the two sidewalls (5) and being anchored in the beads (4); a crown reinforcement or belt (7) circumferentially provided between the radially outer portion (3a) of the tread (3) and the carcass reinforcement (6); a radially inner elastomer layer (8), referred to as the "crown inner layer," having a formulation that is different than that of the radially outer portion (3a) of the tread, said crown inner layer being in turn circumferentially arranged between the radially outer portion (3a) of the tread (3) and the carcass reinforcement (6); characterized in that said crown inner layer (8) is capable of reducing the running noise of the tire, and comprises a rubber composition comprising 50 to 100 pce of a styrene-butadiene copolymer having a glass transition temperature of higher than -10°C, a reinforcing filler, and a cross-linking system.