Tire reinforced by hybrid cables

Abstract

Presented is a tire that includes a crown, which is extended by two sidewalls and two beads and which includes a carcass ply anchored in the beads. The crown includes at least one reinforcing crown ply that includes parallel cables, which are oriented relative to the circumferential direction by an angle α of between 10 and 45 degrees. The crown further includes at least one hooping crown ply that includes cables oriented in the circumferential direction, which are wound in a spiral. The hooping crown ply is made of a composite fabric that includes a rubber composition based on at least one diene elastomer which is reinforced by hybrid cables that each have a ratio of final tensile tangent modulus:initial tensile tangent modulus which is greater than 10.

1 . A tire comprising: 
 a crown which is extended by two sidewalls and two beads and which comprises a carcass ply anchored in said beads, said crown comprising:    at least one reinforcing crown ply comprising parallel cables which are oriented relative to the circumferential direction by an angle α of between 10 and 45 degrees, and    at least one hooping crown ply comprising cables oriented in said circumferential direction which are wound in a spiral, wherein said hooping crown ply is made of a composite fabric comprising a rubber composition based on at least one diene elastomer which is reinforced by hybrid cables that each have a ratio of final tensile tangent modulus:initial tensile tangent modulus which is greater than 10.    
   
   
       2 . A tire according to  claim 1 , wherein said hooping crown ply is arranged radially to the outside of every said reinforcing crown ply.  
   
   
       3 . A tire according to  claim 1 , wherein said hooping crown ply is arranged radially to the inside of said carcass ply.  
   
   
       4 . A tire according to  claim 1 , in which said crown comprises at least two superposed reinforcing crown plies each comprising parallel cables which are crossed from one ply to the other, forming with said circumferential direction angles of between 10 and 45 degrees, wherein said hooping crown ply is arranged between said reinforcing crown plies.  
   
   
       5 . A tire according to  claim 1 , wherein said crown comprises at least two superposed reinforcing crown plies each comprising parallel cables which are crossed from one ply to the other, forming with said circumferential direction angles of between 10 and 45 degrees, wherein said hooping crown ply is arranged between said carcass reinforcement and the reinforcing crown ply located radially furthest to the inside.  
   
   
       6 . A tire according to  claim 1 , wherein, over its entire width, the hybrid cables of said hooping crown ply have a high-temperature contraction potential (CS), in the vulcanized, new state of said tire, which is less than or equal to the high-temperature contraction potential of these same cables which have been adherised before their incorporation into said hooping crown ply.  
   
   
       7 . A mounted assembly usable for fitting on a heavy vehicle, said mounted assembly comprising: 
 a rim;    a tire mounted on said rim; and    a support membrane which is mounted on said rim within said tire and which is adapted to support said tire in the event of a drop in the pressure within said tire, such that said mounted assembly comprises in its inner space two mutually airtight cavities which are separated from each other by said membrane, which is reinforced in its crown by at least one reinforcing crown ply and by a hooping crown ply, which comprises cables oriented in the circumferential direction of said mounted assembly, wherein said hooping crown ply is made of a composite fabric comprising a rubber composition based on at least one diene elastomer which is reinforced by hybrid cables that each have a ratio of final tensile tangent modulus: initial tensile tangent modulus which is greater than 10.