US 5,702,548 AGranted

Tire having circumferential cables for anchoring the carcass

AssigneeSedepro

InventorsJean-Claude Arnaud, Pedro Costa Pereira

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Abstract

The anchoring of the carcass reinforcing elements 1 is assured by circumferential cables 2, with the interposition of a connecting rubber composition 3. The circumferential cable 2 is arranged in several turns forming one or more helices. These circumferential cables have an operational elongation rate A.sub.f =A.sub.e +A.sub.p of more than 4%. This operational elongation rate does not include the specific elongation A.sub.s of the "cable" effect. The maximum stress R.sub.m of the cable 2 is preferably more than 2000 MPa. The cables have undergone a heat treatment which has, in combination, the features of being a recovery annealing treatment and which is carried out directly on cable comprising wires previously separately covered by an adherent coating.

Claims7

Dependent claims

A tire comprising sidewalls which terminate in beads, the beads being designed to be mounted on a rim, said tire comprising a carcass reinforcement which passes into the sidewalls and joins the beads, at least one of said beads comprising:

carcass reinforcing elements extending from the radially lower part of the bead towards the sidewall;
at least one pile of circumferential cables or cable windings laterally bordering the carcass reinforcing elements, each said circumferential cable having an operational elongation rate A.sub.f =A.sub.e +A.sub.p of more than 4%, A.sub.e bring elastic elongation and A.sub.p being plastic elongation, and
a connecting rubber mix between the circumferential cables and the carcass reinforcing elements, whereby the at least one pile of circumferential cables or cable windings anchors the carcass reinforcement in the bead.

Dependencies are inferred from the claim text.