Patent ID: 9527348
Filing Date: 2016-12-27
CPC Classification: B60C

Claim Text:
1. A tread band for a tyre; the tyre comprises a toroidal body ply which has two beads and supports the tread band and two sidewalls each arranged between the tread band and a respective bead; the tread band extends between two opposite lateral ends located at borders between the tread band and the sidewalls; the tread band comprises a centre extending between two first junctions; two shoulders, which are located on either side of the centre and each of which extends between a respective first junction and a second junction; and two edges, which are located on either side of the shoulders, belong to the tread band, form a transition with the sidewalls, and each of which extends between a respective second junction and a lateral end; the profile of the tread band comprises at least a first arc forming part of the centre of the tread band and having a first radius; two second arcs forming part of the shoulders of the tread band and having a second radius smaller than the first radius; and two third arcs forming part of the edges of the tread band and having a third radius smaller than the second radius; the profile of the tread band also comprises a fourth arc, which has a fourth radius greater than the first radius of the first arc, forms part of the centre of the tread band, is located centrally between two first arcs, and extends between two third junctions; at each first junction, each second arc is connected discontinuously to the first arc by a step, wherein the second arc is not tangent to, and is radially lower than, the first arc; at each second junction, each third arc is tangent, and connected continuously, to the second arc; at each third junction, each first arc is tangent and connected continuously to the fourth arc; and the radial distance between the extension of the first arc and the second arc increases gradually from the centre to the shoulders, so that the radial distance, measured at the first junction, between the extension of the first arc and the second arc is less than the radial distance, measured at the second junctions, between the extension of the first arc and the second arc.