US 12,240,272 B2
Tire having an improved tread
Miguel Fernandez, Clermont-Ferrand (FR); Regis Schach, Clermont-Ferrand (FR); Philippe Labrunie, Clermont-Ferrand (FR); Karine Longchambon, Clermont-Ferrand (FR); and Alexandre Tobie, Clermont-Ferrand (FR)
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
Appl. No. 17/771,091
Filed by COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
PCT Filed Oct. 15, 2020, PCT No. PCT/FR2020/051839
§ 371(c)(1), (2) Date Apr. 22, 2022,
PCT Pub. No. WO2021/079047, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 1911784 (FR), filed on Oct. 22, 2019.
Prior Publication US 2022/0371371 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B60C 11/00 (2006.01)
CPC B60C 11/005 (2013.01) [B60C 2011/0025 (2013.01); B60C 2011/0033 (2013.01); B60C 2200/04 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A tire, for a passenger vehicle, bearing a marking on a sidewall that indicates that it is designed to be used on a snow-covered road, comprising:
a crown comprising an outer strip having a tread that is intended to come into contact with the ground via a tread surface, two beads that are intended to come into contact with a rim, and two sidewalls that connect the crown to the beads,
the outer strip being radially on the outside of a crown reinforcement comprising crown layers comprising reinforcing elements, and the tread being axially on the inside of the part of the sidewalls that is radially on the outside of the crown reinforcement,
the outer strip being constituted of a central part and two axially outer parts,
the central part of the outer strip having an axial width equal to 80% of an axial width of the tread surface,
the outer strip comprising at least two rubber compounds, the two rubber compounds making up at least 90% of the volume of the outer strip,
the first rubber compound being radially on an outside of the second rubber compound, the second rubber compound making up at least 60% of a volume of the axially outer parts of the outer strip and being disposed in a layer that is substantially continuous from one axially outer part of the outer strip to the other, the layer having a minimum radial thickness at least equal to 0.3 mm,
wherein the first rubber compound has a dynamic shear modulus G*, at 10% deformation at 10 Hz at 23° C. measured in accordance with standard ASTM D 5992-96, at least equal to 1.35 times a dynamic shear modulus G*, at 10% deformation at 10 Hz at 23° C. measured in accordance with standard ASTM D 5992-96, of the second rubber compound and at most equal to 3 times the dynamic shear modulus G*, at 10% deformation at 10 Hz at 23° C. measured in accordance with standard ASTM D 5992-96, of the second rubber compound,
wherein the first rubber compound has a dynamic loss tan D-10_1, measured in accordance with standard ASTM D 5992-96, at a temperature of −10° C. and under a stress of 0.7 MPa at 10 Hz, at least equal to 0.5,
wherein the second rubber compound has a dynamic loss tan D23_2, measured in accordance with standard ASTM D 5992-96, at a temperature of 23° C. and under a deformation of 10% at 10 Hz, at most equal to 0.3, and
wherein the first and second rubber compounds have reinforcing fillers made up of at least 80% silica, expressed as a percentage of a total mass of the reinforcing fillers.