Multi-layer steel cable for tire carcass

US6748989B2 · kind B2 · utility

Inventors

• Francois-Jacques Cordonnier · Clermont-Ferrand, FR
• Alain Domingo · Pont-du-Château, FR

Key dates

• Filing date: Dec 18, 2001
• Grant date: Jun 15, 2004
• Expiry date: Dec 1, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2973
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A multi-layer cable having an unsaturated outer layer, comprising a core (C0) of diameter d0 surrounded by an intermediate layer (C1) of six or seven wires (M=6 or 7) of diameter d1 wound together in a helix at a pitch p1, surrounded by an outer layer (C2) of N wires of diameter d2 wound together in a helix at a pitch p2, N being less by 1 to 3 than the maximum number Nmax of wires which can be wound in one layer about the layer C1, this cable has the following characteristics (d0, d1, d2, p1 and p2 in mm):(i) 0.14<d0<0.28;(ii) 0.12<d1<0.25;(iii) 0.12<d2<0.25;(iv) for M=6: 1.10<(d0/d1)<1.40; for M=7: 1.40<(d0/d1)<1.70;(v) 5&pgr;(d0+d1)<p1<p2<5&pgr;(d0+2d1+d2);(vi) the wires of layers C1 and C2 are wound in the same twist direction.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.