Crown reinforcement for aircraft tire
An improvement in an airplane tire to obtain a more even distribution of temperature within the crown of the tire. An airplane tire comprises a crown reinforced by a working reinforcement ( 3 ), comprising at least one layer of working reinforcement ( 30 ) made up of axially juxtaposed substantially circumferential strips ( 31 ) made up of mutually parallel textile reinforcing elements ( 32 ) coated with a polymer coating material ( 33 ). Each strip is in contact, over at least its radially inner axial face, with a heat transfer element ( 34 ) comprising at least one heat-conducting material with thermal conductivity at least equal to 50 times the thermal conductivity of the polymer coating material. The product of the thickness of a heat transfer element by the tension modulus of a heat transfer element is at most equal to 0.3 times the product of the thickness of the strip by the tension modulus of the strip.
1. An airplane tire comprising:
a crown adapted to come into contact with the ground via a tread and connected by two sidewalls to two beads intended to come into contact with a rim;
a radial carcass reinforcement connecting the two beads;
a crown reinforcement, radially on the inside of the tread and radially on the outside of the radial carcass reinforcement, comprising a working reinforcement and a protective reinforcement;
the working reinforcement, radially on the inside of the protective reinforcement, comprising at least one layer of working reinforcement;
each layer of working reinforcement comprising axially juxtaposed substantially circumferential strips;
each strip being made up of mutually parallel textile reinforcing elements coated with a polymer coating material;
each strip of at least one layer of working reinforcement is in contact, over at least its radially inner axial face, with a heat transfer element comprising at least one heat-conducting material, wherein the thermal conductivity of a heat-conducting material of a heat transfer element is at least equal to 50 times the thermal conductivity of the polymer coating material of the textile reinforcing elements of the strip in contact with the heat transfer element, and wherein the product of the thickness of a heat transfer element by the tension modulus of a heat transfer element is at most equal to 0.3 times the product of the thickness of the strip by the tension modulus of the strip.
2. The tire according to claim 1 , wherein each strip of each layer of working reinforcement is in contact, over at least its radially inner axial face, with a heat transfer element comprising at least one heat-conducting material.
3. The tire according to claim 1 , wherein a heat transfer element is made up of at least one substantially circumferential metal band.
4. The tire according to claim 1 , wherein a heat transfer element is made up of a single substantially circumferential metal band of which the axial width is equal to the axial width of the strip in contact with the heat transfer element.
5. The tire according to claim 1 , wherein a heat transfer element is made up of a plurality of axially juxtaposed substantially circumferential metal bands, of which the sum of the axial widths is at most equal to the axial width of the strip in contact with the heat transfer element.
6. The tire according to claim 1 , wherein a heat transfer element is made up of a plurality of axially disjointed substantially circumferential metal bands distributed over the axial width of the strip in contact with the heat transfer element.
7. The tire according to claim 3 , wherein a substantially circumferential metal band comprises holes.
8. The tire according to claim 3 , wherein a substantially circumferential metal band comprises circular holes.
9. The tire according to claim 3 , wherein a substantially circumferential metal band comprises holes of a diameter at most equal to half the width of the band.
10. The tire according to claim 1 , wherein a heat-conducting material of a heat transfer element is made of metal.
11. The tire according to claim 1 , wherein a heat-conducting material of a heat transfer element is aluminum.
12. The tire according to claim 11 , wherein a heat transfer element has a thickness at most equal to 0.1 mm.
13. The tire according to claim 1 , wherein any heat transfer element has periodic geometric oscillations in a circumferential plane perpendicular to the axial direction.