Wire Rope for a Tire

Abstract

Metal cable having two layers of construction 4+N comprising an inner layer C 1 of four wires of diameter d 1 wound together in a helix at a pitch p 1 , this layer C 1 itself being surrounded by an outer layer C 2 of N wires of diameter d 2 wound together in a helix at a pitch p 2 . The cable has the following characteristics (d 1 , d 2 , p 1 and p 2 in mm): 0.25<d 1 <0.40, 0.25<d 2 <0.40, 3.5<p 1 <7<p 2 <14. Such a cable, of preferred construction 4+9, is in particular usable for reinforcing tires, in particular as an anchoring means for a carcass reinforcement of a tire without a solid bead wire.

1 . A metal cable having two layers of construction 4+N comprising an inner layer C 1  of 4 wires of diameter d 1  wound together in a helix at a pitch p 1 , this layer C 1  itself being surrounded by an outer layer C 2  of N wires of diameter d 2  wound together in a helix at a pitch p 2 , wherein said cable has the following characteristics (d 1 , d 2 , p 1  and p 2  in mm):
 0.25<d 1 <0.40;   0.25<d 2 <0.40;   3.5<p 1 <7<p 2 <14.   
   
   
       2 . The cable according to  claim 1 , in which the wires of the layers C 1  and C 2  are of identical diameter (d 1 =d 2 ). 
   
   
       3 . The cable according to  claim 1 , in which the layers C 1  and C 2  are wound in the same direction of twist. 
   
   
       4 . The tire according to  claim 1 , in which the layer C 2  comprises from 8 to 12 wires (8≦N≦12). 
   
   
       5 . The cable according to  claim 4 , in which the layer C 2  comprises from 8 to 10 wires (8≦N≦10). 
   
   
       6 . The cable according to  claim 1 , in which the outer layer C 2  is an unsaturated layer. 
   
   
       7 . The cable according to  claim 6 , in which the cable has the construction 4+9. 
   
   
       8 . The cable according to  claim 1 , having the following characteristics (d 1 , d 2 , p 1  and p 2  in mm):
 0.30<d 1 <0.40;   0.30<d 2 <0.40;   4.0<p 1 <7 and 8<p 2 <14.   
   
   
       9 . The cable according to  claim 8 , having the following characteristics:
 4.5≦p 1 ≦6.5 and 8.5≦p 2 ≦13.5.   
   
   
       10 . The cable according to  claim 1 , the metal of the metal cable being steel. 
   
   
       11 . The cable according to  claim 10 , the steel being a carbon steel. 
   
   
       12 . The cable according to  claim 11 , the carbon steel having a carbon content of between 0.1% and 1.2%. 
   
   
       13 . The cable according to  claim 12 , the carbon steel having a carbon content of between 0.5% and 1.1%. 
   
   
       14 . The cable according to  claim 13 , the carbon steel having a carbon content of between 0.6% and 1.0%. 
   
   
       15 . The cable according to  claim 1 , the total elongation at break (At) of the cable being greater than 2.5%. 
   
   
       16 . The cable according to  claim 15 , wherein the total elongation at break (At) is greater than 3.0%. 
   
   
       17 . The cable according to  claim 16 , wherein the total elongation at break (At) is greater than 3.5%. 
   
   
       18 . The cable according to  claim 1 , the operational elongation (structural and elastic) (Af) of the cable being greater than 4.0%. 
   
   
       19 . The cable according to  claim 18 , wherein the operational elongation (Af) is greater than 5.0%. 
   
   
       20 . The cable according to  claim 19 , wherein the operational elongation (Af) is greater than 6.0%. 
   
   
       21 .- 33 . (canceled)