PIRELLI TYRE S.p.A.

A tyre for vehicle wheels includes a tread band having a first annular portion delimited by two circumferential channels. The first annular portion includes two annular grooves extending along respective zig-zag paths. Each of the two annular grooves is defined by a plurality of first parts inclined on one side with respect to a reference plane orthogonal to an equatorial plane of the tyre and by a plurality of second parts inclined with respect to the reference plane on the opposite side to the first parts. Each of the second parts is circumferentially interposed between two respective first parts. Each of the first parts is connected to a respective circumferential channel by a respective first transversal groove arranged at an intermediate portion of the first part and by a respective second transversal groove arranged at an end of the first part.

A vehicle tyre with an asymmetric internal structure and external profile relative to its middle line plane. When mounted on a rim and installed with a camber angle, the rotating tyre generates lateral forces during straight-line running: a camber force from the wheel's inclination, a structural force from the asymmetric internal construction, and a conicity force from the asymmetric external profile. The conicity force opposes the camber force direction, and its magnitude remains below the structural force magnitude. This configuration enables control of the resulting lateral force while reducing rolling resistance during straight-line operation.

An “all season” tyre ( 1 ) for cars and/or light transport vehicles is described, having a tread band ( 8 ) provided with a plurality of longitudinal channels and a plurality of grooves ( 6 , 7 , 11,12, 13 ) and sipes ( 21 , 22 , 23 , 24 , 25 ) having a substantially transverse course, regularly arranged in the central ribs formed by the longitudinal channels and in the shoulder regions (L 2 , L 3 ) over the whole tread band ( 8 ). The tread band ( 8 ) also has transverse notches resulting from joining a groove and a sipe having a transverse course, arranged consecutively to each other, and seamlessly extending substantially over the whole portion of the tyre containing them, i.e., the shoulder regions (L 2 , L 3 ) or some of the central ribs ( 9 , 10 ).

The present invention relates to a tyre for vehicle wheels, in particular automobile wheels, characterised by a tread comprising at least one iso-styrene/trans-butadiene/terpene random terpolymer. Said tread is characterised by a greater tear resistance and a greater grip of the tyre to the roadbed.

A car tyre ( 100 ), in particular a high or ultra high performance car tyre also suitable for use on track, is described; the tread band ( 1 ) of the tyre has a central region (L 1 ), separated from two shoulder regions (L 2 , L 3 ), respectively an outer shoulder region (L 2 ) and inner shoulder region (L 3 ); the outer shoulder region (L 2 ) has a width greater than the width of the inner shoulder region (L 3 ); the outer and inner shoulder regions are provided with relatively large grooves ( 5,6 ); in the outer shoulder region these grooves ( 5 ) alternate with narrower grooves ( 7 ), which reduce the stiffness of this tyre region only to a limited extend; the central region (L 1 ) of the tyre, instead, was designed so as to have a low void-to-rubber ratio of equal to or smaller than 0.09.

A motorcycle tyre, comprising a radial carcass structure ( 2 ) and a tread band ( 8 ) applied at a radially outer position with respect to the radial carcass structure ( 2 ), wherein the radial carcass structure ( 2 ) comprises a first carcass ply ( 3 a ) and a second carcass ply ( 3 b ) including a first plurality of textile reinforcing cords ( 30 ) and a second plurality of textile reinforcing cords ( 32 ), respectively, wherein the first textile reinforcing cords ( 31 ) are parallel to each other and the second textile reinforcing cords ( 33 ) are parallel to each other and have a respective first and second inclination at a crown portion ( 8 c ) of the tread band ( 8 ) with respect to an equatorial plane (X-X) of the tyre, wherein said second inclination is opposite to said first inclination. The first textile reinforcing cords ( 31 ) and the second textile reinforcing cords ( 33 ) have a tenacity comprised between 0.35 cN/Tex and 1.2 cN/Tex at 2% elongation and comprised between 0.5 cN/Tex and 3 cN/Tex at 5% elongation. At least one central annular sector ( 8 a ) of the tread band ( 8 ) arranged astride of the equatorial plane (X-X) is made of a vulcanized elastomeric material having a static elastic modulus Ca3 measured at 70° C. comprised between 9.0 and 14.0, a tandelta measured at 70° C. and 10 Hz comprised between 0.120 and 0.160, and a dynamic elastic modulus F measured at 70° C. and 10 Hz comprised between 3.7 and 4.1.

A tyre ( 100 ) for racing bicycle wheels comprises a carcass structure ( 2 ) and a tread band ( 6 ) arranged in a radially outer position with respect to the carcass structure ( 2 ); wherein the carcass structure ( 2 ) comprises a single carcass ply ( 3 ) turned around annular anchoring structures ( 4 a, 4 b ) and wherein free edges ( 11 ) of the carcass ply ( 3 ) are radially juxtaposed over one another. A protective layer ( 16 ) has a width equal to or less than 50% of the width of the tyre ( 100 ). A first sidewall reinforcing ply ( 14 ) and a second sidewall reinforcing ply ( 15 ) are axially arranged between a respective annular anchoring structure ( 4 a, 4 b ) and an equatorial plane (X) of the tyre. In a first area of juxtaposition ( 17 ), the protective layer ( 16 ), the first sidewall reinforcing ply ( 14 ) and the portion of juxtaposition ( 12 ) of edges of carcass ply are radially juxtaposed according to a predetermined order. In a second area of juxtaposition ( 18 ), the protective layer ( 16 ), the second sidewall reinforcing ply ( 15 ) and the portion of juxtaposition ( 12 ) of edges of carcass ply are radially juxtaposed according to a predetermined order. The first area of juxtaposition ( 17 ) and the second area of juxtaposition ( 18 ) are arranged at respective distances from the equatorial plane (X) comprised between 3% and 24% of the width of the tyre ( 100 ).

A tyre includes a tread band, a tread surface which is radially external to the tread band, and a plurality of blocks formed on the tread band. Each block is at least partially delimited by a groove which defines a flank of the block. The flank is joined to a tread surface portion. The tread surface portion is defined on the block in the region of an edge of the block. There are, on a portion of the edge, a plurality of consecutive recesses and, in the region of at least two of these recesses, there is a respective block portion which defines a protrusion. The protrusion projects from the flank of the block towards the inner side of the groove and extends as far as a bottom of the groove.

A tyre for vehicle wheels comprises a support structure and a tread band arranged in a radially outer position with respect to the support structure. The support structure comprises at least one reinforcing layer including a plurality of hybrid reinforcing cords ( 10 ′) each having a metallic wire ( 21 ) twisted together with a multifilament textile yarn ( 22 ) comprising a plurality of filaments ( 23 ). In any cross section of each of said hybrid reinforcing cords ( 10 ′), the metallic wire ( 21 ) is at least partially embedded in the filaments ( 23 ) of the multifilament textile yarn ( 22 ).

A vehicle wheel tyre comprises a tread band, a tread surface, a plurality of blocks defined on the tread band, and at least one sipe formed on at least one of the blocks. The at least one sipe is open on a tread surface portion and at least on one first edge of the block, to define at least one first edge portion and at least one second edge portion adjacent to each other and at least partially bounded by the sipe. The first edge portion is defined by a chamfer extending between the tread surface portion and a wall of the block, and the second edge portion is defined by a corner resulting from the tread surface portion intersecting the wall.