Multi-layer steel cable for tire carcass

Abstract

A multi-layer cable having an unsaturated outer layer, usable as a reinforcing element for a tire carcass reinforcement, comprising a core of diameter dsurrounded by an intermediate layer (C) of four or five wires (M=4 or 5) of diameter dwound together in a helix at a pitch p, this layer Citself being surrounded by an outer layer (C) of N wires of diameter dwound together in a helix at a pitch p, N being less by 1 to 3 than the maximum number Nof wires which can be wound in one layer about the layer Cthis cable having the following characteristics (d, d, d, pand pin mm):0.08<<0.28;  (i)0.15<<0.28;  (ii)0.12<<0.25;  (iii)for=4: 0.40 <()<0.80;  (iv)for=5: 0.70<()<1.10;4.8π()<<5.6π(2);  (v)the wires of layers Cand Care wound in the same direction of twist.  (vi) The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to tires intended for industrial vehicles, more particularly truck tires and their carcass reinforcement plies.