Agricultural Vehicle Tire Comprising a Single-Layer Carcass Reinforcement

A tire for an agricultural vehicle, intended to be mounted on a rim having a nominal diameter Dj and to be inflated to a recommended minimum pressure at most equal to 240 kPa, having an outside diameter D and comprising, radially from the outside to the inside, a tread, a crown reinforcement and a carcass reinforcement:

• the tread comprising tread pattern elements that are separated from one another by voids and having a radial height H at least equal to 20 mm and at most equal to 60 mm, measured between a tread surface and a bearing surface parallel to the tread surface and tangential to the bottoms of the deepest voids,
• the tread, which has an axial width L, comprising at least two axially outer voids, each having a mean line that forms an angle at most equal to 45° with a circumferential direction (XX′) of the tire, which are positioned on either side of an equatorial plane (XZ) passing through the middle of the tread and are spaced apart from one another by a mean axial distance L1 at least equal to 0.5*L,
• the tread having an overall volumetric void ratio TEV, defined as the ratio between the volume VC of voids and the total volume V of the tread assumed to be free of voids, comprised between the bearing surface and the tread surface, at least equal to 30% and at most equal to 60%,
• the crown reinforcement comprising at least two crown layers, each comprising metal reinforcers that are coated in an elastomer-based material, are mutually parallel, are crossed from one layer to the next and form an angle at least equal to 10° with the circumferential direction (XX′) of the tire,
• the carcass reinforcement comprising at least one carcass layer comprising textile reinforcers that are coated in an elastomer-based material, are mutually parallel and form an angle at least equal to 75° and at most equal to 105° with the circumferential direction (XX′) of the tire,
• wherein the carcass reinforcement is made up of a single carcass layer (41) having a mean thickness E at most equal to 2 mm and a breaking strength Fr, expressed in daN/cm, that satisfies the relationship:
• Fr>=Fs=(Cs*Pmax*10−3)*((R2−((R+Rj)/2)2)/Rj, with
• Fs:
• reference threshold strength
• Cs:
• safety factor at least equal to 1,
• Pmax:
• recommended maximum inflation pressure,
• R=D/2:
• outside radius of the tire,
• Rj=Dj/2:
• nominal radius of the rim.