Tire having improved uniformity and method for manufacturing same

A method for manufacturing a tire (10) comprising a crown (12), two sidewalls (22) and two beads (24), each sidewall (22) connecting each bead (24) to the crown (12), a carcass reinforcement (32) anchored in each bead (24) and extending in each sidewall (22) and radially internally at the crown (12), the carcass reinforcement (32) comprising at least one carcass layer (34), and the crown (12) comprising a tread (20) intended to come into contact with the ground when the tire (10) is rolling and a crown reinforcement (14) arranged radially between the tread (20) and the carcass reinforcement (32), the crown reinforcement (14) comprising a working reinforcement (16) comprising a single working layer (18), the method comprising:

• winding a carcass ply (51) or a plurality of carcass plies (51) around a support (60) having a substantially cylindrical shape around a main axis (A), to form at least one wound carcass assembly (52) intended to form the carcass layer (34), the wound carcass assembly (52) being axially delimited by two axial edges (52A, 52B) of the wound carcass assembly (52) and comprising carcass filamentary reinforcing elements (340) extending substantially parallel to one another axially from one axial edge (52A, 52B) to the other axial edge (52A, 52B) of the wound carcass assembly (52), each carcass filamentary reinforcing element (340) extending, in the or each carcass ply (51), in a main direction (K3) of each carcass filamentary reinforcing element (340), the main direction (K3) of each carcass filamentary reinforcing element (340) in the or each carcass ply (51) forming, with the circumferential direction (Z) of the support (60), an initial angle (A3) of each carcass filamentary reinforcing element (340);
• winding a working ply (49) or a plurality of working plies (50), radially outside the wound carcass assembly (52), to form a wound working assembly (50) intended to form the working layer (18), the wound working assembly (50) being axially delimited by two axial edges (50A, 50B) of the wound working assembly (50) and comprising working filamentary reinforcing elements (180) extending substantially parallel to one another axially from one axial edge (50A, 50B) to the other axial edge (50A, 50B) of the wound working assembly (50), each working filamentary reinforcing element (180) extending, in the or each working ply (49), in a main direction (K2) of each working filamentary reinforcing element (180) in the or each working ply (49), the main direction (K2) of each working filamentary reinforcing element (180) in the or each working ply (49) forming, with the circumferential direction (Z) of the support (60), an initial angle (A2) of each working filamentary reinforcing element (180), the wound carcass assembly (52) and the wound working assembly (50) forming an assembly (58) of substantially cylindrical shape around the main axis (A) of the support (60);
• and
• deforming the assembly (58) of substantially cylindrical shape around the main axis (A) of the support (60) so as to obtain an assembly (58) of substantially toric shape around the main axis (A) of the support (60) so that:
• the main direction (K3) of each carcass filamentary reinforcing element (340) forms, with the circumferential direction (z) of the support (60):
• a final angle (B3 S) of each carcass filamentary reinforcing element (340), in absolute value, strictly less than 80°, in a portion (52S) of the wound carcass assembly (52) extending axially in radial line with the wound working assembly (50), and
• a final angle (B3F) of each carcass filamentary reinforcing element (340) ranging, in absolute value, from 80° to 90°, in a portion (52F) of the wound carcass assembly (52) intended to extend radially in each sidewall (22), and
• the main direction (K2) of each working filamentary reinforcing element (180) forms, with the circumferential direction (z) of the support (60), a final angle (B2) of each working filamentary reinforcing element (180), in absolute value, strictly greater than 10°,
• wherein, during the step of forming the wound carcass assembly (52), the wound carcass assembly (52) having two circumferential end edges (54A, 54B) extending axially from one of the axial edges (52A, 52B) to the other of the axial edges (52A, 52B) of the wound carcass assembly (52), one of the following alternatives I, II, III is implemented:
• I—the wound carcass assembly (52) is formed so as to form a junction (56) between the two circumferential end edges (54A, 54B) of the wound carcass assembly (52) by abutment without forming a superposition between a carcass filamentary reinforcing element (340) of one of the circumferential end edges (54A, 54B) of the wound carcass assembly (52) and a carcass filamentary reinforcing element (340) of the other of the circumferential end edges (54A, 54B) of the wound carcass assembly (52), at least in a portion (52S) of the wound carcass assembly (52) intended to extend axially in radial line with the wound working assembly (50),
• II—the wound carcass assembly (52) is formed so as to form a junction (56) between the two circumferential end edges (54A, 54B) of the wound carcass assembly by overlapping so as to form a radial superposition between at least one carcass filamentary reinforcing element (340) of one of the circumferential end edges (54A, 54B) of the wound carcass assembly and at least one carcass filamentary reinforcing element (340) of the other of the circumferential end edges (54A, 54B) of the wound carcass assembly, at least in the portion (52S) of the wound carcass assembly (52) intended to extend axially in radial line with the wound working assembly (50), so that, without a step of forming the wound working assembly (50) prior to the deformation step, the deformation step would lead to an opening of the junction (56), and
• III—the wound carcass assembly (52) is formed so that the two circumferential end edges (54A, 54B) of the wound carcass assembly are circumferentially spaced from one another at least in the portion (52S) of the wound carcass assembly (52) intended to extend axially in radial line with the wound working assembly (50).