Multi-layer steel cable for tire crown reinforcement

US6766841B2 · kind B2 · utility

Assignee

• MICHELIN RECHERCHE ET TECHNIQUE S.A. · CH

Inventors

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

Key dates

• Filing date: Jul 3, 2003
• Grant date: Jul 27, 2004
• Expiry date: Jul 3, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249934
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A multi-layer cable having an unsaturated outer layer, usable as a reinforcing element for a crown reinforcement of a tire, comprising a core of diameter d0 surrounded by an intermediate layer (C1) of four or five wires (N=4 or 5) of diameter d1 wound together in a helix at a pitch p1, this layer C1 itself being surrounded by an outer layer (C2) of P wires of diameter d2 wound together in a helix at a pitch p2, P being less by 1 to 3 than the maximum number Pmax of wires which can be wound in one layer about the layer C1, this cable having the following characteristics (d0, d1, d2, p1 and p2 in mm):(i) 0.10&lE;d0<0.50;(ii) 0.25&lE;d1<0.40;(iii) 0.25&lE;d2<0.40;(iv) for N=4: 0.40<(d0/d1)<0.80;for N=5: 0.70<(d0/d1)<1.10;(v) 4.8 &pgr;(d0+d1)<p1<p2<5.6&pgr;(d0+2d1+d2); and(vi) the wires of layers C1 and C2 are wound in the same direction of twist.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 radial tires and their crown reinforcement plies.