US 4,848,429 AGranted

Asymmetrical tire for vehicle wheels

AssigneePirelli Coordinamento Pneumatici S.p.A.

InventorMario Mezzanotte

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Abstract

The present invention concerns a tire for vehicle wheels, intended for being used for sports events and for high performance, that is capable of guaranteeing, under any running conditions--of time, as well as of the road, the best road-behaviour characteristics. The tire of the invention presents a tread pattern that is axially subdivided into two circumferential adjacent sections--of blocks and grooves respectively, and a tread-band--comprised by two circumferential portions that are axially adjacent--made from diverse elastomeric compositions and having a diverse thickness, where the line of separation--between the two sections of the pattern, does not coincide with the line of separation between the two portions made of elastomeric compositions. The said tread-band, is supported by a mixed textile/metallic breaker structure, having an asymmetrical profile--with respect to the equatorial plane of the tire.

Claims10

Dependent claims

Tire for vehicle wheels having a radial ply carcass of substantially toric profile with a tread band of elastomeric material on the crown area of said tire, and a breaker structure between the tread band and the carcass;

said tread band having a radial thickness that varies from a maximum value to a minimum value along the axial width thereof;
said tread band consisting of first and second circumferentially contiguous portions made of dissimilar elastomeric compositions said first portion having an elastomeric rebound of not less than 25% and said second portion having an elastic rebound of not over 20% with the ratio between the axial width of said first portion of elastomeric composition and that of the second portion is at least 55/45;
said tread band consisting of first and second circumferentially contiguous zones having dissimilar tread patterns, the pattern of the first zone having raised blocks and generally corresponding to said first portion of elastomeric composition and the pattern of the second zone being a rib pattern with the ratio between the axial width of the first zone of tread pattern and that of said second zone is at most 50/50;
the axial width of said first zone being less than the axial width of said first portion such that the outer tread surface of the entire first zone and a part of the second zone is formed from the elastomeric composition of said first portion.

1 more element

Dependencies are inferred from the claim text.