摘要:
The invention relates to a tyre tread comprising at least one groove (1), said groove being delimited by two opposing walls (11, 12) connected to one another by a groove bottom (13), said groove having a width and a depth, said groove (1) comprising at least one device for preventing resonance noise, said device being formed by at least one strip (3) of flexible rubber attached to one of the walls (11, 12) delimiting the groove or on the bottom thereof (13) and at least partially closing the section of the groove, each flexible strip (3) comprising two main walls (31, 32) closing the section of the groove, end walls (30) delimiting said main walls and a linking wall with the tread, said device being such that each flexible strip (3) also comprises at least one raised rib (4) on at least one of the main walls (31, 32) thereof, said raised rib (4) starting on the wall or the bottom supporting the flexible strip and extending over at least 50% of the length of the flexible strip, said length being measured, in a direction perpendicular to the wall supporting said flexible strip, between two end walls.
摘要:
The invention relates to a tyre comprising a tread that comprises at least one central rib (411-413) and two side ribs (421-422) separated by circumferential grooves (141-144), wherein a first side rib (421), adjacent to the outer axial edge of the tread and at least one (and preferably each) of the central ribs comprise a first portion (4211, 4111, 4121, 4131) of which the axial width exceeds 20% of the axial width of the rib in question made from a rubber composition comprising an elastomer and a reinforcing filler, the majority of which consists of carbon black, and a second, axially adjacent portion (4212, 4112, 4122, 4132), made from a rubber composition comprising an elastomer and a reinforcing filler, the minority of which consists of carbon black, wherein the rubber compositions making up the second portion of the first side rib and the second portion of the central rib all have a value tan 00 that is lower than the value tan 00 of the rubber compositions forming the first portion of the first side rib and the first portion of the central rib, the values tan 00 being measured at a temperature of 0°C and under a stress of 0.7 MPa, wherein the first portion of the central rib extends axially from the outer border of the central rib, the axial width LPC of that portion being, over the entire radial depth of the central rib, greater than or equal to 20% of the axial width LC of the central rib, and wherein the second portion of the central rib is axially adjacent to the first portion of the central rib.
摘要:
Tyre (10) comprising a carcass reinforcement (60) and two beads (50), each comprising at least one annular reinforcing structure (70), a bead filler (120) and an outer strip (130) made from a rubber composition having an elastic modulus G' of less than or equal to 15 MPa and a viscous modulus G" such that G" [MPa]
摘要:
The invention relates to a tyre having a predetermined mounting direction on the vehicle, comprising a tread (40) comprising at least one central rib (411-413) and two side ribs (421, 422), separated by circumferential slots (141-144), in which the side ribs are made from a first rubber composition filled with at least 50% carbon black and at least one of the two central ribs comprises a portion (4111, 4121) made from a second rubber composition filled with more than 50% carbon black, the axial width (LP) of said portion being greater than or equal to 20% of the axial width (LC) of the central rib in question; wherein the first rubber composition has a tan delta value (tan delta is measured at 0°C and 0.7 MPa) that is below the tan delta value of said at least one second rubber composition.