US 12,240,271 B2
Tire having an improved tread
Miguel Fernandez, Clermont-Ferrand (FR); Karine Longchambon, Clermont-Ferrand (FR); Regis Schach, Clermont-Ferrand (FR); Philippe Labrunie, Clermont-Ferrand (FR); and Alexandre Tobie, Clermont-Ferrand (FR)
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
Appl. No. 17/771,072
Filed by COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
PCT Filed Oct. 15, 2020, PCT No. PCT/FR2020/051838
§ 371(c)(1), (2) Date Apr. 22, 2022,
PCT Pub. No. WO2021/079046, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 1911783 (FR), filed on Oct. 22, 2019.
Prior Publication US 2022/0371370 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)] 14 Claims
OG exemplary drawing
 
1. A tire for a passenger vehicle comprising:
a crown comprising an outer strip having a tread that is intended to come into contact with a 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, the outer strip being axially on an inside of a part of the sidewalls that is radially on an outside of the crown reinforcement, and 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 a 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 D0_1, measured in accordance with standard ASTM D 5992-96, at a temperature of 0° 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.