Crown Reinforcement For Aircraft Tire
Working layer ( 5 ) comprises a circumferential zigzag winding of a strip ( 6 ) on a cylindrical surface having as its axis the axis of rotation of the tire ( 1 ), with a periodic curve ( 7 ), the peak-to-peak amplitude of which defines the axial width L of the working layer ( 5 ) between a first and a second axial end (I, I′). The working layer ( 5 ) is made up, in any meridian plane (YZ) containing the axis of rotation of the tire ( 1 ), of an arrangement of portions of strip ( 6 ) extending axially from the first axial end (I) to the second axial end (I′) of the working layer ( 5 ), such that two consecutive portions of strip ( 6 ) overlap, at least in part, over a width of overlap e. The width of overlap e between two consecutive portions of strip ( 6 ) is constant over the entire axial width L of the working layer ( 5 ).
1 . 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 layer made up of a circumferential zigzag winding of a strip on a cylindrical surface having as its axis of revolution the axis of rotation of the tire, with a periodic curve, the peak-to-peak amplitude of which defines the axial width L of the working layer between a first and a second axial end;
the working layer being made up, in any meridian plane containing the axis of rotation of the tire, of an arrangement of portions of strip R extending axially from the first axial end to the second axial end of the working layer,
the strip of width W being made up of textile reinforcers coated in an elastomeric compound,
wherein, in any meridian plane containing the axis of rotation of the tire, the arrangement of portions of the strip extending axially from the first axial end to the second axial end of the working layer is such that two consecutive portions of the strip overlap, at least in part, over a width of overlap e, and wherein the width of overlap e between two consecutive portions of the strip is constant over the entire axial width L of the working layer.
2 . The aircraft tire according to claim 1 , wherein the width of overlap e between two consecutive portions of the strip is at least equal to 0.5 times and at most equal to 0.8 times the width W of the strip.
3 . The aircraft tire according to claim 1 , wherein the width of overlap e between two consecutive portions of the strip is equal to 0.5 times the width W of the strip.
4 . The aircraft tire according to claim 1 , wherein the width of overlap e between two consecutive portions of the strip is equal to 0.66 times the width W of the strip.
5 . The aircraft tire according to claim 1 , wherein the width W of the strip is at least equal to 2 mm.
6 . The aircraft tire according to claim 1 , wherein the width W of the strip is at most equal to 20 mm.
7 . The aircraft tire according to claim 1 , wherein the reinforcers of the working layer are made of an aliphatic polyamide.
8 . The aircraft tire according to claim 1 , wherein which the reinforcers of the working layer are made of an aromatic polyamide.
9 . The aircraft tire according to claim 1 , wherein the reinforcers of the working layer are made of a combination of an aliphatic polyamide and of an aromatic polyamide.
10 . A method of manufacturing an aircraft tire according to claim 1 , comprising a step of manufacturing a working layer in which step the working layer is obtained by circumferential zigzag winding of the strip of width W onto the lateral surface of a building drum of radius R f and having as axis of revolution the axis of rotation of the tire, with a periodic curve the peak-to-peak amplitude of which defines the axial width L of the working layer between a first axial end and a second axial end.
11 . The aircraft tire according to claim 1 , wherein the width W of the strip is at least equal to 6 mm.
12 . The aircraft tire according to claim 1 , wherein the width W of the strip is at most equal to 14 mm.