Tyre comprising metal cord
AssigneePirelli Pneumatici S.p.A.
InventorOmero Noferi
Life of this patent
Estimating the term…
Abstract
A tyre for a vehicle wheel, includes a torus-shaped carcass, a tread located on a periphery of the carcass, and a pair of axially-facing side walls ending with beads reinforced with bead wires and respective bead-filling elements for mounting the tyre on a corresponding rim. The tyre includes rubberized fabrics reinforced with metal reinforcing cords. At least one of the metal reinforcing cords comprises at least two wires helicoidally double-twisted around a longitudinal axis of the metal cord. Further, at least one of the wires is permanently deformed by a substantially-sinusoidal deformation lying in a plane.
Claims8
Device for manufacturing metal cords to be used particularly for reinforcing composite elastomeric products, comprising:
- a supporting structure;
- a rotor engaged with respect to said Supporting structure and rotatable according to a predefined axis;
- a cradle fastened to said supporting structure according to an oscillation axis which coincides with the rotation axis of the rotor;
- feeding devices operatively fitted on said cradle to feed several elementary wires from respective feeding spools, said elementary wires being driven onto said rotor according to a stranding path with end sections coinciding with the rotation axis of said rotor and with a central section distanced from said rotation axis;
- at least one preforming device operatively engaged with the cradle and operating on one of said elementary wires in a section upstream with respect to the first end section of the stranding path;
- characterized in that said at least one preforming device is suitable for providing said elementary wire with a deformation which is substantially sinusoidal without sharp edges.
Process for manufacturing a metal cord, particularly for reinforcing composite elastomeric products, comprising at least two elementary wires, with a diameter preferablly between 0.10 and 0.50 mm, said procedure comprising the following phases:
- permanently deforming at least one of said elementary wires by means of a deformation which is substantially sinusoidal without sharp edges;
- stranding said elementary wires together by means of helicoidal double twisting around the longitudinal axis of said cord.
Tyre for vehicle wheels, comprising a torus-shaped carcass, a tread located on the periphery of said carcass, a pair of axially facing side walls ending with beads reinforced with bead wires and respective bead filling elememnts for fixing said tyre to a corresponding mounting rim, said tyre comprising rubberized fabrics reinforced with metal reinforcing cords, comprising at least two elementary wires helicoidally twisted together and around the axis of longitudinal extension of the cord, characterized in that at least one of said elementary wires is permanently deformed by a substantially sinusoidal deformation without sharp edges.
Dependencies are inferred from the claim text.