Patent ID: 6311748
Filing Date: 2001-11-06
Classification: B60C,Y10S

Abstract:
A tire for motor-vehicle wheels provided with a tread producing a low rolling noise, comprising:a raised pattern formed of a plurality of shaped blocks distributed in parallel circumferential rows bounded by longitudinal grooves extending circumferentially of the tire, the parallel circumferential rows comprising inner central rows, inner shoulder rows and outer shoulder rows, the outer shoulder rows being adjacent to respective axial outer side edges of the tire,each row comprising a plurality of shaped blocks circumferentially separated from each other by respective transverse cuts,wherein each of said rows has first transverse cuts each of which are in alignment with a respective one of the first transverse cuts of an adjacent block row to define continuous transverse grooves each extending from an outer side edge of the tread to a position adjacent an equatorial plane of the tire,wherein each of said transverse grooves comprises a first portion extending from one of the axial outer side edges of the tread and extending between blocks of the outer shoulder row, and a second portion disposed obliquely of the longitudinal grooves and located between blocks of the inner central row, and one curved union portion between the first and second portions, wherein in each row of said shaped blocks said first transverse cuts define an impact angle with the respective longitudinal grooves, the value of the impact angle in the outer shoulder rows of blocks closest to each of the axial outer side edges of the tread is in the range of 70.degree. to 105.degree. andsaid inner central rows have a number of shaped blocks which is lower than the number of shaped blocks provided in the outer shoulder rows, said longitudinal grooves have a smaller width than the first transverse cuts, and said pattern is a non-directional pattern.