US 12,403,724 B2
Tire for high-power agricultural vehicle
Philippe Johnson, Clermont-Ferrand (FR); and Nizar Didane, Clermont-Ferrand (FR)
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
Appl. No. 18/024,652
Filed by COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
PCT Filed Sep. 2, 2021, PCT No. PCT/FR2021/051507
§ 371(c)(1), (2) Date Mar. 3, 2023,
PCT Pub. No. WO2022/049345, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 2008990 (FR), filed on Sep. 4, 2020.
Prior Publication US 2023/0241920 A1, Aug. 3, 2023
Int. Cl. B60C 9/00 (2006.01); B60C 9/20 (2006.01)
CPC B60C 9/005 (2013.01) [B60C 9/2009 (2013.01); B60C 2009/0085 (2013.01); B60C 2009/2016 (2013.01); B60C 2009/2019 (2013.01); B60C 2200/08 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A radial tire for an agricultural-type vehicle, which tire is IF or VF according to the 2020 ETRTO standard, which has an authorized inflation pressure during use on loose ground of less than or equal to 1 bar, which has a speed index at least equal to D for a maximum speed at least equal to 65 km/h, and which has a load index at least equal to 158, configured for mounting on a rim with a diameter at least equal to 24 inches, comprising:
a tread intended to come into contact with the ground via a tread surface, which tread has an axial width LT and comprises a central portion with an axial width LT/2 and two axially outer portions, each with an axial width LT/4,
the two axially outer portions comprising tread pattern blocks with a radial height h at least equal to 45 mm, these blocks covering at least 80% of the axial width LT/4 of the axially outer portions of the tread and having a circumferential thickness ep at least equal to 65 mm,
a crown reinforcement radially inside of the tread, comprising at most four working layers, each working layer comprising—textile reinforcing—cords, which are coated in a rubber material and which are mutually parallel to form angles at least equal to 15° and at most equal to 45° with a circumferential direction of the tire,
wherein each textile reinforcing cord of each working layer is a hybrid cord that:
has a tensile breaking force at least equal to 32 daN, and
comprises:
a first strand, which consists of an aromatic polyamide (aramid), which has a linear density at least equal to 160 g per km and which has a tensile breaking force at least equal to 30 daN, and
a second strand, which consists of polyethylene terephthalate (PET) and which has a linear density of between 140 and 160 g per km.