Aircraft tire with specified zigzag working reinforcement

An aircraft tire comprising:

• a working reinforcement radially on the inside of a tread and radially on the outside of a carcass reinforcement;
• the working reinforcement comprising at least one working bi-ply made at least in part of two radially superposed working layers;
• each working layer being made up of a juxtaposition of portions of a strip of width W;
• the strip being wound in a zigzag, in the circumferential direction of the tire, onto a cylindrical laying surface of radius R, having as its axis of revolution the axis of rotation of the tire, and with a periodic curve;
• the periodic curve corresponding to the mid-line of the strip and forming, with the circumferential direction of the tire and in the equatorial plane of the tire, a non-zero angle A;
• and
• two consecutive strip portions, each having respective mid-lines comprising extrema,
• wherein the circumferential distance (c) between the extrema of the respective mid-lines of the two consecutive strip portions is equal to the ratio W/sin A between the width W of the strip and the sine of the angle A, and wherein, for any set of three consecutive strip portions, made up of a first, a second and a third portion having respective mid-lines comprising extrema, the respective mid-lines of the first and third strip portions intersect at an intersection point, axially aligned with the extremum of the mid-line of the second strip portion and axially on the inside of said extremum at an axial distance (a) at least equal to the width W of the strip, and
• wherein any portion of the periodic curve, extending axially inwards from one extremum of the periodic curve to a point on the equatorial plane of the tire, comprises a first, concave circular portion of radius R1, extending axially inwards from the extremum to a second, convex circular portion of radius R2, the second, convex circular portion of radius R2 extending axially inwards to a third, rectilinear portion forming an angle A with the circumferential direction, the third, rectilinear portion extending axially inwards to the point on the equatorial plane of the tire.