High performance rain tyre

摘要

A high performance rain tire includes a tread band, having an inner portion and an outer portion as well as a central zone. There are formed in the tread band: two circumferential grooves in the inner portion, a central circumferential groove and a plurality of inner transverse grooves and a plurality of outer transverse grooves, wherein the inner transverse grooves include a central inner section which defines an angle with respect to the equatorial plane of between approximately −95° and approximately −135° and the outer transverse grooves include a central outer section which defines an angle, relative to the equatorial plane, of between approximately +125° and approximately +165°.

主权项

1. A high performance rain tyre comprising a tread band through which an equatorial plane of said tyre extends so as to define:
an inner portion of said tread band which is intended, in use, to extend toward a support axle of a wheel equipped with said tyre, and an outer portion of said tread band which is arranged axially opposite said inner portion with respect to said equatorial plane; and a central zone of said tread band which is centered on said equatorial plane and extends over a width of approximately 30% of the total width of said tread band, there being formed in said tread band: at least two circumferential grooves formed in said inner portion; at least one central circumferential groove distinct from said at least two circumferential grooves formed in said inner portion, said central circumferential groove being formed in a manner such that an axis thereof is within the central zone; a plurality of inner transverse grooves arranged in sequence along a circumference of said tread band, each inner transverse groove extending continuously from said central circumferential groove across said inner portion as far as an inner shoulder zone of said tread band, maintaining a substantially constant width along a length thereof; a plurality of outer transverse grooves arranged in sequence along the circumference of said tread band, each outer transverse groove extending continuously from said central circumferential groove across said outer portion as far as an outer shoulder zone of said tread band, maintaining a substantially constant width along a length thereof, wherein: at most a single circumferential groove, distinct from said at least two circumferential grooves formed in said inner portion and said at least one central circumferential groove, is formed in said outer portion, said inner transverse grooves comprise a central inner section in a vicinity of said central circumferential groove and an end inner section extending from said central inner section across said inner shoulder zone, said central inner section extending along a development direction having an inclination relative to an axial direction of said tyre which is greater than the inclination relative to said axial direction defined by a development direction of said end inner section, the development direction of said central inner section defining an angle, relative to said equatorial plane, of between approximately −95° and approximately −135°, said outer transverse grooves comprise a central outer section in a vicinity of said central circumferential groove, and an end outer section extending from said central outer section across said outer shoulder zone, said central outer section extending along a development direction having an inclination relative to said axial direction which is greater both than the inclination relative to said axial direction defined by a development direction of said end outer section and the inclination relative to said axial direction defined by the development direction of said central inner section, the development direction of said central outer section defining an angle, relative to said equatorial plane, of between approximately +125° and approximately +165°, each respective adjacent pair of said plurality of outer transverse grooves is connected by a first notch formed in said tread band between said end outer sections of said adjacent outer transverse grooves, each first notch is arranged in a condition of non-alignment with corresponding first notches provided between adjacent pairs of outer transverse grooves, and each first notch extends along a substantially perpendicular direction to said end outer sections.