Reinforced tyre
AssigneePirelli Pneumatici S.p.A.
InventorsGiancarlo Armellin, Guido Riva
Life of this patent
Estimating the term…
Abstract
Tire for vehicle wheels, comprising metallic reinforcing cords made of a single strand of elementary filaments preformed by sinusoidal waving and wound together. Said metallic cords show a value of the integral of the breaking stress not lower than 5000 J/m3.
Claims24
Tire for vehicle whe ls, comprising metallic reinforcing cords made of a singl strand of elementary filaments preformed by sinusoidal waving and wound together, said metallic cords comprising the following characteristics:
- a) a number of filaments in the range from 3 to 8;
- b) a diameter of each said filament in the range from 0.12 mm to 0.35 mm;
- c) a linear density in the range from 0.18 to 4.0 g/m;
- d) a value of the integral of the breaking stress not lower than 5000 J/m3.
Pair of tires for two-wheeled vehicles, provided with a belt structure comprising at least one radially outermost layer formed by a plurality of axially adjacent circumferential turns of a cord wound at a substantially null angle to the equatorial plane of the tire, characterized in that
- said cord comprises the following characteristics:
- a) a number of filaments in the range from 3 to 8;
- b) a diameter of each said filament in the range from 0.12 mm to 0.35 mm;
- c) a linear density in the range from 0.18 to 4.0 g/m;
- d) said reinforcing cords having a value of the integral of the breaking stress not lower than 5000 J/m3;
- in the belt structure of the front tire, said tires are distributed axially with a maximum denseness of 6 cords/cm;
- in the belt structure of the rear tire, said tires are distributed axially with a maximum denseness of 10 cords/cm.
Motor vehicle fitted with a pair of tires, respectively a front and a rear tire, characterized in that said pair comprises at least one radially outermost layer formed by a plurality of axially adjacent circumferential turns of a cord wound at a substantially null angle to the equatorial plane of the tire, said cord comprising the following characteristics:
- e) a number of filaments in the range from 3 to 8;
- f) a diameter of each said filament in the range from 0.12 mm to 0.35 mm;
- g) a linear density in the range from 0.18 to 4.0 g/m;
- h) said reinforcing cords having a value of the integral of the breaking stress not lower than 5000 J/m3;
- in the belt structure of the front tire, said tires are distributed axially with a maximum denseness of 6 cords/cm;
- in the belt structure of the rear tire, said tires are distributed axially with a maximum dens ness of 10 cords/cm.
Method for rubberizing metallic reinforcing cords for tires for wheels of vehicles, wherein said cords pass through an xtrusion head supplied with rubberizing material, comprising the stage of exerting a pressure of not more than 150 bars in said extrusion head.
Method for laying at least one metallic reinforcing cord on the building wheel of a tire for wheels of vehicles, comprising the stage of connecting a roller for collecting and dispensing said cord to a pulling capstan capable of maintaining a constant pull at all times during the laying process, and of exerting a constant tension, in the range from 30 N to 200 N, on said at least one cord.
Dependencies are inferred from the claim text.