| 摘要 |
Tire tread having a central part (I) made from at least one first rubber compound and having at least one circumferential rib (121-123) formed of a plurality of blocks (1210) separated by sipes; a first and a second lateral part (II and III) made of at least a second and third rubber compound, and having a circumferential rib (131,141) formed by a plurality of blocks (1310,1410), separated by sipes, wherein the at least one second and third rubber compounds have a value of tan δ at 23° C.—at a frequency of 10 Hz and an elongation of 10% —of less than 0.25, wherein the complex modulus G*(T) of the at least one first rubber compound is greater than the complex moduli G*(T) of at least one second and third rubber compounds for all temperatures T greater than or equal to 0° and less than or equal to 60° C. |
| 主权项 |
1. A tire comprising:
two beads intended to come into contact with a mounting rim, each bead comprising at least one annular reinforcing structure defining a median plane (200) perpendicular to the axis of rotation of the tire and situated equidistant from the annular reinforcing structures of each bead, two sidewalls extending the beads radially outwards, the two sidewalls meeting in a crown comprising a crown reinforcement radially surmounted by a sub-tread extending across the entire axial width of the crown reinforcement and itself surmounted by a tread provided with a tread pattern formed of elements in relief, the tread having, in each radial section, a first axial edge and a second axial edge;
wherein the tread comprises:
a central part (I) made of at least one first rubber compound extending, in each radial section, on either side of the median plane, between a first axial end and a second axial end, the central part comprising at least one circumferential rib formed of a plurality of blocks separated by sipes so that the mean distance separating two adjacent blocks is less than 0.8 mm, the number of blocks being greater than or equal to 100;a first lateral part (II) made of at least one second rubber compound, extending from the first axial edge of the tread as far as the first axial end of said central part, the first lateral part comprising at least one circumferential rib formed by a plurality of blocks separated by sipes so that the mean distance separating two adjacent blocks is greater than 0.8 mm and less than 5 mm, the number of blocks being less than the number of blocks that make up the said at least one circumferential rib of the central part; anda second lateral part (III) made of at least one third rubber compound, extending from the second axial edge of the tread as far as the second axial end of said central part, the second lateral part comprising at least one circumferential rib formed by a plurality of blocks separated by sipes so that the mean distance separating two adjacent blocks is greater than 0.8 mm and less than 5 mm, the number of blocks being less than the number of blocks that make up said at least one circumferential rib of the central part;wherein the said at least one second and third rubber compounds have a value of tan δ at 23° C., at a frequency of 10 Hz and an elongation of 10%, which is less than 0.25;and wherein the complex modulus G*(T) of said at least one first rubber compound is greater than the complex moduli G*(T) of said at least one second and third rubber compounds for all temperatures T greater than or equal to 0° and less than or equal to 60° C. |
