Pirelli Tyre S.p.a.

Pirelli Pneumatici S.p.a.

Stefano Bizzi

Gianni Mancini

Roberto Bolzoni

Gianfranco Colombo

Daniele Lorenzetti

Diego Ettore Speziari

Maurizio Boiocchi

Stefano Montesello

Cesare Emanuele Amurri

Guido Luigi Daghini

Giuseppe Matrascia

Guido Riva

Alfredo Balini

Giancarlo Cucco

Simone Agresti

Barbara Rampana

Lisa Grassi

Fiorenzo Brivio

Cèline Almonacil

Dario Scaltritti

Andrea Scotti

Pier Luigi De Cancellis

Roberta Giambelli

The invention relates to a metallic reinforcing cord () for tyres for vehicle wheels, comprising a plurality of metallic wires () twisted to one another with a single twisting pitch (P), or a single metallic wire twisted with at least one second metallic wire with a single twisting pitch, or a plurality of first metallic wires twisted to one another with a first twisting pitch to define a first strand of metallic wires and at least one second metallic wire twisted with said first strand of metallic wires with a second twisting pitch equal to or different from the first twisting pitch. The metallic reinforcing cord () has a part load elongation greater than or equal to 1%.

Metallic reinforcing cord for tyres for vehicle wheels

A tyre having a tread is described. The tyre has a central portion located across an equatorial plane, a first shoulder portion located towards an outer side of the tyre and a second shoulder portion located towards an inner side of the tyre. The central portion is separated from the first shoulder portion by two first circumferential grooves. The first shoulder portion and the second shoulder portion have a plurality of first transverse grooves having a first end located substantially at the respective edge of the tread, having a width greater than or equal to about 4 mm and an axial extension equal to at least 50% of the width of the shoulder portion in which they are located.

Car tyre

Tyre for vehicle wheels, comprising a tread band comprising circumferential grooves, circumferential ribs defined by said circumferential grooves and a plurality of sipes () that extend, on said circumferential ribs, from a radially outer surface of the tread band towards a radially inner portion of the tread band. Said sipes () extend along a predetermined trajectory and comprise, in any cross section perpendicular to said predetermined trajectory, a main portion () having a first radial dimension (H′) and a first transversal dimension (T, T′) substantially constant along a radial direction and, in a radially outer position with respect to said main portion (), a top portion () extending up to said radially outer surface of the tread band and having, at said radially outer surface of the tread band, a second transversal dimension (W) greater than said first transversal dimension (T, T′).

Tyre for vehicle wheels

Car tire

Tire for vehicle wheels

Tire

A tire includes a carcass, a belt structure, and a tread band. The belt structure includes at least two belt plies and at least one belt layer radially external to the belt plies. The at least one belt layer extends at least for an axial width of the at least two belt plies and includes at least one first elongated element and at least one second elongated element. The elongated elements form turns substantially oriented in a circumferential direction of the tire. The turns are alternately disposed along an axial development of the at least one belt layer. The at least one first elongated element is a hybrid cord including at least one high-elastic-modulus filament and at least one low-elastic-modulus filament that are twisted together. An elastic modulus of the at least one second elongated element is lower than an elastic modulus of the at least one first elongated element.

Tyre with specified belt structure

A pneumatic tire having a belt structure includes: a first belt layer; a second belt layer in a radially inner position with respect to the first belt layer, a third belt layer in a radially inner position with respect to the first and second belt layers, each belt layer including a plurality of elongated reinforcing elements disposed at a first, second and third belt angle respectively. The first and second belt angles have an absolute value of 15 to 40 degrees; the second angle is of opposite sign with respect to the first belt angle; and the third belt angle has an absolute value of 40 to 90 degrees and is of opposite sign with respect to the second belt angle. The belt structure also includes a zero degree belt layer placed in a radially outer position with repeat to the first belt layer including elongated reinforcing elements arranged such as to form a belt angle which is substantially zero.

Pneumatic tire having an improved belt structure

A tire having (i) an asymmetric tread profile with a shoulder drop difference of 0.3 to 0.9; and (ii) an asymmetric tread pattern so as to have a ratio between the inner void/solid ratio and the outer void/solid ratio of 1.1 to 1.50. By the above combination of features, handling and aquaplaning performance is remarkably improved even at high operating speeds without negatively affecting the wear resistance of the tread band.

Pneumatic tire having an asymmetric tread profile

Growing community of inventors

Milan, Italy

Stefano Bizzi