Pirelli Pneumatici S.p.a.

Pirelli Coordinamento Pneumatici S.p.a.

Metzeler Reifen Gmbh

Peter Kronthaler

Giancarlo Armellin

Thomas Zoller

A high-transverse-curvature tire ( ), in particular to be mounted on the front wheel of a motor-vehicle, which includes a belt structure ( ) including, in a radially external layer ( ), a plurality of circumferential coils ( ), axially arranged side by side, of a cord ( ) wound at a substantially zero angle with respect to the equatorial plane (X&mdash;X) of the tire. An area occupied by rubber blocks ( ) formed in a portion of the tread band ( ), having a length equal to the pitch (p) of the tread pattern and a width equal to the axial development of the tread band ( ), is between % and % of the total area of the portion.

High-transverse-curvature tire, in particular for use in front wheels of motor-vehicles

A method of manufacturing a high transverse-curvature motor-bike tire includes the steps of providing a carcass structure on a main assembly drum, providing at least one strip made of an elastomeric material incorporating a plurality of reinforcing cords on a comb-like drum, radially expanding radially-mobile sectors associated with the drum, circumferentially winding at least one inextensible cord on the at least one strip to form circumferential coils and to define a belt structure, circumferentially associating a tread around the belt structure, and associating the belt structure, together with the tread, around the carcass structure. The at least one cord is wound on the at least one strip at a substantially-null angle with respect to the equatorial plane of the drum according to a winding direction adapted to compression-stress, at least during initial winding, elastomeric material portions interposed between consecutive reinforcing cords incorporated in the at least one strip.

Method of manufacturing a high transverse-curvature motor-bike tire

A high transverse-curvature tire for two-wheeled vehicles includes a carcass structure, a belt structure, and tread. The carcass structure includes at least two superimposed plies provided with reinforcing cords. The belt structure includes radially-outer and radially-inner layers. Each ply's reinforcing cords are essentially parallel to other reinforcing cords of that ply and are oriented along directions inclined with respect to an equatorial plane of the tire. The reinforcing cords of at least two adjacent plies are oriented in opposite directions with respect to the equatorial plane. The carcass structure includes at least one first sheet, located between the at least two plies, made of an elastomeric material incorporating fibrous reinforcing fillers. The plurality of circumferential coils are distributed with a constant density throughout an axial development of the belt structure. The radially-inner layer includes at least one second sheet made of an elastomeric material incorporating fibrous reinforcing fillers.

High transverse-curvature tire for two-wheeled vehicles including specified belt structure

A high transverse-curvature tire for two-wheeled vehicles includes a carcass structure, a belt structure, and a tread. The carcass structure includes at least two superimposed plies provided with reinforcing cords. The belt structure includes radially-outer and radially-inner layers. The reinforcing cords of each ply are essentially parallel to other reinforcing cords of that ply and are oriented along directions inclined with respect to an equatorial plane of the tire. The reinforcing cords of at least two adjacent superimposed plies are oriented in opposite directions with respect to the equatorial plane of the tire. The carcass structure includes at least one first sheet, located between the at least two superimposed plies, made of an elastomeric material incorporating fibrous reinforcing fillers. The radially-inner layer includes at least one second sheet made of an elastomeric material incorporating fibrous reinforcing fillers.

A high transverse-curvature tire for two wheeled-vehicles comprises a carcass structure, a belt structure including radially-inner and radially-outer layers, and a tread. The radially-inner layer comprises at least one strip made of an elastomeric material incorporating a plurality of reinforcing cords essentially parallel to one another and oriented along directions inclined with respect to the equatorial plane of the tire. The radially-outer layer includes a plurality of circumferential coils, axially arranged side-by-side, of at least one circumferentially-inextensible cord wound at a substantially null angle with respect to the equatorial plane of the tire according to a winding direction adapted to compression-stress elastomeric material portions interposed between consecutive reinforcing cords incorporated in the at least one strip of the radially-inner layer.

High transverse-curvature motor-bike tire

A high-transverse-curvature tire (,), in particular for mounting onto the rear wheel of motor-vehicles, comprises a tread band (,), coaxially extended around a belt structure (,), wherein a plurality of rubber blocks (,), defined between a plurality of grooves (,) extending along a direction substantially transverse to the tire running direction (D), are formed which grooves comprise a bottom (,) connected to opposite inlet (,) and outlet (,) sidewalls. In an equatorial zone (E) of the tread band (,), the inlet wall (,) of the grooves (,) is inclined with respect to the bottom (,) of the same towards the tire rolling direction, and forms an angle (&agr;) of from,&deg; to,&deg; with respect to a plane (&pgr;) tangent to the bottom (,).

High-transverse-curvature tire, in particular for use in rear wheels of motor-vehicles

A high-transverse-curvature tire (1), in particular to be mounted on the front wheel of a motor-vehicle, comprises a belt structure (6) including, in a radially external layer (9a), a plurality of circumferential coils (7a), axially arranged side by side, of a cord (7) wound at a substantially zero angle with respect to the equatorial plane (X--X) of the tire. The area occupied by rubber blocks (10) formed in a portion of the tread band (8) having a length equal to the pitch (p) of the tread pattern and a width equal to the axial development of the tread band (8), is between 70% and 90% of the total area of said portion.

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München, Germany

Peter Kronthaler