Radial tire having a very thin belt structure

A radial tire, defined in three main directions, circumferential, axial and radial, comprising a crown surmounted by a tread, two sidewalls, two beads, each sidewall connecting each bead to the crown, a carcass reinforcement that is anchored in each of the beads and extends in the sidewalls as far as the crown, a belt that extends in the crown in the circumferential direction and is situated radially between the carcass reinforcement and the tread, said belt comprising a multilayer composite laminate comprising at least three superposed layers of reinforcers, said reinforcers being unidirectional within each layer and embedded in a thickness of rubber, respectively,

• wherein, on a tread side, a first layer of rubber comprises a first row of reinforcers, said reinforcers being first reinforcers, which are oriented at an angle α of −5 to +5 degrees with respect to the circumferential direction and made of a heat-shrinkable textile material;
• wherein, in contact with the first layer of rubber and disposed beneath the first layer of rubber, a second layer of rubber comprises a second row of reinforcers, said reinforcers being second reinforcers, which are oriented at a given angle β, which is positive or negative, of between 10 and 30 degrees with respect to the circumferential direction and are metal reinforcers;
• wherein, in contact with the second layer of rubber and disposed beneath the second layer of rubber, a third layer of rubber comprises a third row of reinforcers, said reinforcers being third reinforcers, which are oriented at an angle γ, the opposite of the angle β, itself being between 10 and 30 degrees with respect to the circumferential direction and are metal reinforcers;
• wherein the first reinforcers made of heat-shrinkable textile material are monofilaments with a diameter φ greater than 0.10 mm or assemblies of such monofilaments;
• wherein an envelope diameter D1 of the first reinforcers is between 0.20 mm and 1.20 mm;
• wherein the second reinforcers and third reinforcers are steel monofilaments with a diameter, respectively D2 and D3, of between 0.20 mm and 0.50 mm;
• and
• wherein, measured in a central part of the belt in the vulcanized state on either side of a median plane over a total axial width of 10 cm, a mean thickness Ez1 of rubber separating a first reinforcer from a second reinforcer which is closest to it, measured in the radial direction, is less than or equal to 0.35 mm and a mean thickness Ez2 of rubber separating a second reinforcer from a third reinforcer which is closest to it, measured in the radial direction, is less than or equal to 0.35 mm.