Patent ID: 6962182

Claim:
A multi-layer cable having a unsaturated outer layer, usable as a reinforcing element for a tire crown reinforcement, comprising a core (C 0 ) of diameter d 0 surrounded by an intermediate layer (C 1 ) of six or seven wires (N=6 or 7) of diameter d 1 wound together in a helix at a pitch p 1 , this layer C 1 itself being surrounded by an outer layer (C 2 ) of P wires of diameter d 2 wound together in a helix at a pitch p 2 , P being less by 1 to 3 than the maximum number P max of wires which can be wound in one layer about the layer C 1 , this cable being characterised in that it has the following characteristics (d 0 , d 1 , d 2 , p 1 and p 2 in mm): (i) 0.28≦d 0 <0.50; (ii) 0.25≦d 1 <0.40; (iii) 0.25≦d 2 <0.40; (iv) for N=6: 1.10<(d 0 /d 1 )<1.40; for N=7: 1.40<(d 0 /d 1 )<1.70; (v) 5.3π(d 0 +d 1 )<p 1 <p 2 <4.7π(d 0 +2d 1 +d 2 ); and (vi) the wires of layers C 1 and C 2 are wound in the same direction of twist.