Mounted assemblies for aircraft, wheels and tires

Abstract

The invention relates to mounted assemblies for aircraft and to the wheels and tires which constitute them. The mounted assemblies for aircraft to which the invention relates are characterized in particular by the combination of an inflation pressure greater than 9 bar and a relative deflection of the tire greater than 30%, the wheel comprising a rim for receiving the tire and more specifically seats receiving the beads of said tire. According to the invention, the rim comprises a drop-centre functionality and is advantageously of monobloc type.

1 . A mounted assembly for aircraft formed of a wheel and a tire comprising in particular beads, the inflation pressure of which is greater than 9 bar and the relative deflection of which is greater than 30%, said wheel comprising a rim for receiving the tire and more specifically seats receiving the beads of said tire, and said rim comprising a drop-centre functionality.  
   
   
       2 . A mounted assembly for aircraft according to  claim 1 , wherein the rim is of monobloc type.  
   
   
       3 . A mounted assembly for aircraft according to  claim 1 , wherein the seats of the rim have a slope greater than 5° and preferably less than 15°.  
   
   
       4 . A mounted assembly for aircraft according to  claim 1 , wherein the beads of the tire are ovalisable.  
   
   
       5 . A mounted assembly for aircraft according to  claim 1 , wherein the beads of the tire may be warped.  
   
   
       6 . A mounted assembly for aircraft according to  claim 1 , the tire comprising a crown, two sidewalls and two beads, a carcass reinforcement anchored in the two beads and a crown reinforcement, in which the carcass reinforcement comprises at least one circumferential alignment of reinforcement elements and in which the means for anchoring said reinforcement elements within each bead comprise at least one circumferentially oriented reinforcement element, the carcass reinforcement of the tire comprising at least one layer of reinforcement elements having a zone of upturn around at least one circumferentially oriented reinforcement element  
   
   
       7 . A mounted assembly for aircraft according to  claim 6 , wherein the circumferentially oriented reinforcement element is a bead wire.  
   
   
       8 . A mounted assembly for aircraft according to  claim 1 , comprising a crown, two sidewalls and two beads, a carcass reinforcement anchored in the two beads and a crown reinforcement, in which the carcass reinforcement comprises at least one circumferential alignment of reinforcement elements and in which the means for anchoring said reinforcement elements within each bead comprise at least one circumferentially oriented reinforcement element, the means for anchoring said reinforcement elements within each bead of the tire comprising circumferentially oriented reinforcement elements axially bordering said circumferential alignments of said reinforcement elements of the carcass reinforcement.  
   
   
       9 . A mounted assembly for aircraft according to  claim 8 , wherein the circumferentially oriented reinforcement elements are cables.  
   
   
       10 . A mounted assembly for aircraft according to  claim 1 , the tire comprising in particular a carcass reinforcement, wherein the reinforcement elements of the carcass structure of the tire are arranged in a radial orientation.  
   
   
       11 . An aircraft wheel comprising a rim for receiving a tire, comprising in particular beads, and more specifically seats receiving the beads of said tire, the inflation pressure of the mounted assembly formed of the wheel and said tire being greater than 9 bar and the relative deflection of which is greater than 30%, wherein said rim comprises a drop-centre functionality.  
   
   
       12 . An aircraft wheel according to  claim 11 , wherein the rim is of monobloc type.  
   
   
       13 . An aircraft wheel according to  claim 11 , wherein the seats of the rim have a slope greater than 5°, and preferably less than 15°.  
   
   
       14 . An aircraft tire, the inflation pressure of which is greater than 9 bar and the relative deflection of which is greater than 30%, comprising a crown, two sidewalls and two beads, a carcass reinforcement anchored in the two beads and a crown reinforcement, in which the carcass reinforcement comprises at least one circumferential alignment of reinforcement elements and in which the means for anchoring said reinforcement elements within each bead comprise at least one circumferentially oriented reinforcement element, and at least one anchoring rubber mix in contact with the circumferential reinforcing thread and the reinforcement elements of the carcass reinforcement, the beads of the tire being ovalisable.  
   
   
       15 . A tire according to  claim 14 , wherein the beads of the tire can be warped.  
   
   
       16 . An aircraft tire, the inflation pressure of which is greater than 9 bar and the relative deflection of which is greater than 30%, comprising a crown, two sidewalls and two beads, a carcass reinforcement anchored in the two beads and a crown reinforcement, in which the carcass reinforcement comprises at least one circumferential alignment of reinforcement elements and in which the means for anchoring said reinforcement elements within each bead comprise at least one circumferentially oriented reinforcement element, and at least one anchoring rubber mix in contact with the circumferential reinforcing thread and the reinforcement elements of the carcass reinforcement, said anchoring rubber mix having an elasticity modulus at a deformation of 10% of less than 20 MPa.  
   
   
       17 . A tire according to  claim 16 , wherein the anchoring rubber mix comprises at least one synthetic elastomer included in the group of SBRs and BRs with a total proportion of synthetic elastomer greater than 50% of the total weight of elastomers.  
   
   
       18 . A tire according to  claim 16 , wherein the anchoring rubber mix comprises an SBR of a Tg of between −70° and −25° C. with a proportion by weight greater than 20% of the total weight of elastomers.  
   
   
       19 . A tire according to  claim 16 , wherein the anchoring rubber mix comprises a BR of a Tg of between −110° and −90° C. with a proportion by weight less than 40% of the total weight of elastomers.  
   
   
       20 . A tire according to  claim 16 , wherein the anchoring rubber mix withstands without breaking a static creep stress at 150° C. under an initial stress of 2.35 MPa for at least five hours.  
   
   
       21 . A tire according to  claim 20 , wherein the anchoring rubber mix has an amount of static creep at 150° C. under an initial stress of 2.35 MPa of less than 2×10 −3  mm −1  for between three and five hours.  
   
   
       22 . A tire according to  claim 16 , wherein the anchoring rubber mix has an amount of reversion after 10 min at 197° C. of less than 10% and preferably of less than 5%.  
   
   
       23 . A tire according to  claim 14  or  16 , wherein the carcass reinforcement comprises at least one layer of reinforcement elements having a zone of upturn around at least one circumferentially oriented reinforcement element.  
   
   
       24 . A tire according to  claim 23 , wherein the circumferentially oriented reinforcement element is a bead wire.  
   
   
       25 . A tire according to  claim 14  or  16 , wherein the means for anchoring said reinforcement elements within each bead comprise circumferentially oriented reinforcement elements axially bordering said circumferential alignments of said reinforcement elements of the carcass reinforcement.  
   
   
       26 . A tire according to  claim 25 , wherein the circumferentially oriented reinforcement element are cables.  
   
   
       27 . A tire according to  claim 26 , wherein said cables have a penetrability of between 80 and 100%, wherein the breaking load of the cables is greater than 150 daN and wherein said cables have an elongation at break greater than 4%.  
   
   
       28 . A tire according to  claim 26 , wherein the breaking load of the circumferentially oriented cables is less than 400 daN.  
   
   
       29 . A tire according to  claim 26 , wherein the elongation at break of the circumferentially oriented cables is less than 8%.  
   
   
       30 . A tire according to  claim 26 , wherein said circumferentially oriented cables of said anchoring means are formed of cords selected from among the group consisting of carbon, tungsten, aramid, glass-fiber or steel reinforcing threads.  
   
   
       31 . A tire according to  claim 26 , the circumferentially oriented cables being metal ones, wherein said circumferentially oriented cables are heat-treated.  
   
   
       32 . A tire according to  claim 26 , wherein the surface of the circumferentially oriented cables comprises an adherent coating, such as a brass coating.  
   
   
       33 . A tire according to  claim 14  or  16 , wherein the reinforcement elements of the carcass structure are arranged in a radial orientation.  
   
   
       34 . A tire according to  claim 25 , in which, considering ΣR I  as being the total of the rigidities of extension of the second reinforcing threads arranged axially internally relative to the carcass reinforcement, and considering ΣR E  as being the total of the rigidities of extension of the second reinforcing threads arranged axially on either side of the carcass reinforcement:  
     
       
         
           
             0.6 
             ≤ 
             
               
                 ∑ 
                 
                   R 
                   I 
                 
               
               
                 ∑ 
                 
                   R 
                   E 
                 
               
             
             ≤ 
             1.5 
           
         
       
     
   
   
       35 . A tire according to  claim 34 , in which:  
     
       
         
           
             0.7 
             ≤ 
             
               
                 ∑ 
                 
                   R 
                   I 
                 
               
               
                 ∑ 
                 
                   R 
                   E 
                 
               
             
             ≤ 
             
               1.3 
               . 
             
           
         
       
     
   
   
       36 . A tire according to  claim 14  or  16 , in which, the outer surface of the beads comprising a seat, a frustoconical wall of substantially radial orientation adjacent radially internally to a wall the section of which is an arc of a circle EF of centre C, and considering a line CD passing through the bead, forming an angle α=+45±5 degrees relative to the axis A of the tire, all the second reinforcing threads are arranged at a radial distance from the axis A less than or equal to said line CD.  
   
   
       37 . A tire according to  claim 14  or  16 , in which, said bead having an outer surface intended to come into contact with the corresponding surface of the seat and of the hook of said rim, after mounting on said rim and inflation of said tire, the contact zone between said outer surface of said bead and said rim extends at least as far as point B of the hook of maximum radius R J .  
   
   
       38 . A tire according to  claim 37 , in which, Φ being the diameter of the circumference of the outer surface of the bead intended to come to bear against the circumference of the hook of the rim of maximum radius R J :  
       Φ=2( R   J −ε)  
     with ε being between 0.5 and 2 mm.  
   
   
       39 . A tire according to  claim 14  or  16 , in which said first reinforcing threads of the carcass reinforcement form forward and return paths arranged adjacently, with, at the level of each bead, loops connecting one forward path to one return path each time.  
   
   
       40 . A tire according to  claim 14  or  16 , in which said crown reinforcement comprises at least one working block with at least two layers of reinforcing threads which are parallel in each layer, oriented substantially circumferentially and of high elasticity modulus.  
   
   
       41 . A tire according to  claim 40 , in which, said crown comprising a central zone and two lateral zones, said working block furthermore comprises two layers of reinforcement elements of high elasticity modulus, oriented substantially circumferentially, arranged axially on either side of the median plane of the tire in the lateral zones of said crown.  
   
   
       42 . A tire according to  claim 41 , in which said two layers of reinforcement elements of high elasticity modulus of said working block are arranged radially to the inside of said two layers of circumferentially oriented reinforcing threads of said working block.  
   
   
       43 . A tire according to  claim 40 , in which said working block further comprises two layers of reinforcing threads, which are parallel to each other in each layer and crossed from one layer to the next, forming an angle α, of between 5° and 35°, with the circumferential direction, said reinforcing threads having a high elasticity modulus.  
   
   
       44 . A tire according to  claim 40 , in which said crown reinforcement furthermore comprises, arranged radially externally relative to said working block, a protective layer extending axially beyond the axial width of said layer or layers of reinforcing threads of high elasticity modulus.