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US 6,318,432 B1Granted
Tire for vehicle wheels
AssigneePirelli Pneumatici S.p.A.
InventorsRenato Caretta, Fiorenzo Mariani
Life of this patent
Estimating the term…
Abstract
At least one carcass ply is formed by depositing a strip element, comprising longitudinal thread elements incorporated into a layer of elastomer material, onto a toroidal support. Deposition of the strip element takes place in alternated deposition sections, each comprising two radially-extending side portions and a crown portion extending at a radially external position. The side portions of each deposition section are at least partly overlapped with side portions belonging to an adjacent deposition section. Associated with the carcass ply are an anchoring element. A belt structure, a tread band, and sidewalls are combined with the thus-formed carcass structure to define a tire to be submitted to a vulcanization step.
Claims20
A tire for vehicle wheels, comprising:
- a carcass structure having at least one first carcass ply formed of at least one thread element arranged along deposition paths each extending in a substantially U-shaped conformation about a profile in transverse section of the tire, and a pair of circumferentially inextensible annular structures each engaged close to a respective inner circumferential edge of the at least one first carcass ply;
- a belt structure applied to the carcass structure at a circumferentially external position thereof;
- a tread band applied to the belt structure at a circumferential external position thereof;
- at least one pair of sidewalls applied to the carcass structure at laterally opposite positions;
- wherein the at least one first carcass ply comprises:
- at least one continuous strip element comprising a plurality of longitudinal and parallel thread elements at least partly coated with at least one layer of raw elastomer material;
- the at least one strip element having distinct deposition sections, each of which extends in a substantially U-shaped conformation about the profile in transverse section of the tire, to define two side portions substantially extending in planes orthogonal to a geometric axis of rotation of the tire at mutually spaced apart positions in an axial direction, and a crown portion extending in a radially external position between the side portions;
- the crown portion of each deposition section being arranged in side-by-side relationship along a circumferential extension of the tire, and the side portions of each deposition section each being partly overlapped with a side portion of at least one adjacent deposition section;
- the side portions in mutual-overlapping relationship being joined to each other at a bending end region where the at least one strip element is folded upon itself;
- each of the inextensible annular structures being laterally applied to the at least one first carcass ply.
7 more elements
A tire for vehicle wheels, comprising:
- a carcass structure having at least one first carcass ply formed of at least one thread element arranged along deposition paths each extending in a substantially U-shaped conformation about a profile in transverse section of the tire, and a pair of circumferentially inextensible annular structures each engaged close to a respective inner circumferential edge of the at least one first carcass ply;
- a belt structure applied to the carcass structure at a circumferentially external position thereof;
- a tread band applied to the belt structure at a circumferential external position thereof;
- at least one pair of sidewalls applied to the carcass structure at laterally opposite positions;
- wherein the at least one first carcass ply comprises:
- at least one continuous strip element comprising a plurality of longitudinal and parallel thread elements at least partly coated with at least one layer of raw elastomer material;
- the at least one strip element having distinct deposition sections, each of which extends in a substantially U-shaped conformation about the profile in transverse section of the tire, to define two side portions substantially extending in planes orthogonal to a geometric axis of rotation of the tire at mutually spaced apart positions in an axial direction, and a crown portion extending in a radially external position between the side portions;
- the crown portion of each deposition section being arranged in side-by-side relationship along a circumferential extension of the tire, and the side portions of each deposition section each being partly overlapped with a side portion of at least one adjacent deposition section;
- wherein the side portions of the deposition sections have regions of greater width close to radially inner circumferential edges of the carcass structure.
6 more elements
Dependencies are inferred from the claim text.