In-situ rubberized layered cable for carcass reinforcement for tire

摘要

A metal cord (C-1) having two layers (Ci, Ce) of 3+N construction, rubberized in situ, comprising an inner layer (Ci) formed from three core wires (10) of diameter d₁ wound together in a helix with a pitch p₁ and an outer layer (Ce) of N wires (11) N varying from 6 to 12, of diameter d₂, which are wound together in a helix with a pitch p₂ around the inner layer (Ci), said cord being characterized in that it has the following characteristics (d₁, d₂, p₁ and p₂ being in mm): 0.08d₁0.30; 0.08d₂≦0.20; p₁/p₂≦1; 3p₁30; 6p₂30; the inner layer is sheathed with a diene rubber composition called a “filling rubber” (12) which, for any length of cord of 2 cm or more, is present in the central channel (13) formed by the three core wires and in each of the gaps lying between the three core wires (10) and the N wires (11) of the outer layer (Ce); the content of filling rubber in the cord is between 5 and 35 mg per g of cord. Also disclosed is a multistrand rope comprising at least one two-layer cord, intended in particular for tires of industrial vehicles of the civil engineering type.