Pirelli Pneumatici S.p.a.

Pirelli Tyre S.p.a.

Pirelli Coordinamento Pneumatici S.p.a.

Luigi Campana

Alberto Carra

Flavio Junior Bettiol

Rodolfo Noto

Alessandro Castellini

Ciro Raia

Tire

Pneumatic tire

Pneumatic tire and tire tread

A tire for a wheel of a vehicle includes a carcass, a belt structure, and a tread. The tread pattern includes at least two circumferential grooves and at least three circumferential ribs. The grooves include a zigzag configuration and a shape repeated according to a circumferential pitch. Within a single pitch, each groove includes at least two directions different from a circumferential direction of the tire, generating at least two ground-gripping fronts in each of two rotation directions of the tire, and at least one blind transverse cut extending from opposite sides of the groove, generating a third ground-gripping front. Ends of the blind transverse cuts are positioned on planes parallel to each other and to an equatorial plane of the tire. The first plane and the second plane delimit a continuous portion of at least one of the circumferential ribs. The continuous portion includes a constant axial width.

Tyre for a vehicle wheel including zigzag circumferential grooves and blind transverse cuts

Tire tread

The present invention relates to a tire designed to be fitted on the driving axles of a motor vehicle for medium or heavy load. This tire is provided with a tread comprising a plurality of full-depth transverse grooves and four circumferential series of inclined grooves and four circumferential series of inclined incisions which delimit five circumferential rows of blocks, namely two axially outer rows, two intermediate rows, and one central row lying essentially across the equatorial plane. Each transverse groove extends across the whole width of the tread, and consists of a central portion, located between a pair of consecutive blocks of the central row, and a pair of lateral portions, located between pairs of consecutive blocks of the intermediate and shoulder rows. The two lateral portions of each transverse groove are staggered circumferentially with respect to each other and penetrate into the body of the central row of blocks. The central portion of the transverse groove has a depth of 3 mm, while the depth of the incisions located between the shoulder blocks and the intermediate blocks is less than the depth of the inclined incisions located between the intermediate blocks and the central blocks.

Tire for a vehicle wheel including at least two circumferential series of inclined incisions delimiting at least three rows of blocks

A tyre for vehicles includes a carcass structure, a belt structure, and a tread. The tread includes a row of central blocks and a row of intermediate blocks arranged on each side of an equatorial plane of the tyre between a central longitudinal groove formed astride the equatorial plane and a pair of longitudinal lateral grooves. The blocks of the central rows are separated from the blocks of the intermediate rows by circumferential sipes and are circumferentially staggered by a first predetermined quantity relative to the blocks of the intermediate rows. Also, the blocks of the central rows arranged on a first side of the equatorial plane of the tyre are circumferentially staggered by a second predetermined quantity relative to the blocks of the central rows on a second side of the equatorial plane of the tyre.

Tire and tread thereof

A vehicle wheel tyre includes a carcass structure, a belt structure, and a tread. The tread includes four circumferential grooves and a plurality of transverse grooves that define at least five circumferential rows of blocks, each block approximating a polygon. The longitudinal sides of the blocks are inclined in the same direction at a predetermined angle to the equatorial plane of the tyre. The blocks of each row are circumferentially staggered relative to the blocks of the next row. The blocks of the central row include stiffening means. Profiles of the front sides of the blocks of the central row are the same as the profiles of the rear of the blocks of the central row rotated through 180&deg;. The blocks of the shoulder rows are elastically linked to the blocks of the intermediate rows.

Motor vehicle tire, particularly for lorries and the like

A tire ( ) having low rolling resistance, in particular for driving wheels of heavy vehicles, comprises a tread ( ) provided with a plurality of transversal grooves ( ) pitchwise spaced from one another and extending in a direction substantially perpendicular to the rolling direction of the tire (D). The grooves ( ) have a reduced depth and are provided with respective slits ( ), extending from a bottom portion ( ) thereof; as such, they contribute to impart to the tire ( ) both the desired low rolling resistance and an adequate traction characteristics during straightaway running.

Growing community of inventors

Milan, Italy

Luigi Campana