Patent ID: 7556075

Claim:
A low noise pneumatic tire having a tread, the tread having a radially inner surface facing to a cavity of the tire, belt-shaped sound absorbing members being mounted on the radially inner surface of the tread at prescribed intervals circumferentially of the tire by a fixing elastic band, the belt-shaped sound absorbing members each comprising at least one layer formed of a porous material having an apparent density of 10 kg/m 3 to 70 kg/m 3 ; wherein the at least one belt-shaped sound absorbing layer comprises two belt-shaped sound absorbing layers, each of the two belt-shaped sound absorbing layers having a thickness ranged from 5 mm to 45 mm, a total thickness of the two belt-shaped sound absorbing layers being 50 mm or less, wherein the two belt-shaped sound absorbing layers comprise an outer belt-shaped sound absorbing layer in contact with the radially inner surface of the tread, and an inner belt-shaped sound absorbing layer disposed radially inwardly of the outer belt-shaped sound absorbing layer, the outer belt-shaped sound absorbing layer being formed of a porous material having a tensile strength higher than that of the inner belt-shaped sound absorbing layer, the inner belt-shaped sound absorbing layer having an acoustic absorption coefficient of 10% or greater at a frequency of 200 Hz.