Patent ID: 6520233
Filing Date: 2003-02-18
Classification: B60C,Y10T

Abstract:
A heavy-transport radial tire (1) comprising:a radial carcass (3), in turn, comprising a body ply (4) reinforced with radial wires (6) coated with a first elastomeric material; a tread (8) having two lateral shoulders (9); a tread belt (10) interposed between the tread (8) and the carcass (3) and comprising a pack of superimposed tread plies (11) reinforced with wires (12) inclined with respect to the radial wires (6) of the body ply (4) and coated with a second elastomeric material having an M200% modulus similar to that of said first elastomeric material, each tread ply (11) having two lateral edges (20, 22), each adjacent to a respective said shoulder (9); and, at each said shoulder, an annular shoulder cushion (14) of a third elastomeric material of a relatively low M200% modulus with respect to the M200% moduli of said first and said second material; and a belt cushion gum strip (18) made of a fourth elastomeric material of a relatively high M200% modulus, but ranging between the M200% moduli of said first and said second material on the one hand, and the M200% modulus of said third material, on the other, and interposed between the respective annular shoulder cushion (14) and the tread belt (10) to cover at least the lateral edges (20, 22) of those (11b, 11a) of the tread plies (11) facing the annular shoulder cushion (14).