Claims
- 1. A tire comprising a crown extended by two sidewalls and two beads, a carcass anchored in the two beads, said crown comprising radially from the inside towards the outside:
at least one reinforcement ply formed of parallel reinforcing threads oriented at an angle α relative to the circumferential direction of between 10 and 75 degrees, at least one ply of reinforcing threads which are oriented substantially circumferentially and are helically wound and extend axially substantially above the assembly of said reinforcement ply, and a tread having tread patterns on its outer face with at least one circumferential groove, characterized in that, in the zones arranged radially between said groove and said reinforcement ply formed of reinforcing threads oriented at α, the laying pitch for said reinforcing threads which are helically wound is greater than or equal to the axial width of said groove.
- 2. A tire according to claim 1, in which the laying pitch for said reinforcing threads which are helically wound is greater than or equal to twice the axial width of said groove.
- 3. A tire according to claim 1, in which said circumferentially oriented reinforcing threads comprise at least two reinforcing threads helically wound simultaneously.
- 4. A tire according to claim 3, in which the circumferentially oriented reinforcing threads comprise at most four reinforcing threads helically wound simultaneously.
- 5. A tire according to claim 1, in which said circumferential groove has an axial width greater than or equal to 3.5 mm.
- 6. A tire according to claim 1, in which said tread is in direct contact with said reinforcing threads which are helically wound over at least one given axial zone of said crown.
- 7. A tire according to claim 1, in which, the tread comprising a first mix intended to come into contact with the ground and an underlayer arranged radially beneath said first mix, over at least one given axial zone of said crown, said underlayer is in direct contact with said helically wound reinforcing threads.
- 8. A tire according to claim 1, in which the circumferentially oriented reinforcing threads develop a stress under 3% deformation greater than 12 cN/tex.
- 9. A tire according to claim 8, in which the circumferentially oriented reinforcing threads develop a stress under 3% deformation greater than 20 cN/tex.
- 10. A tire according to claim 8, in which said circumferentially oriented reinforcing threads have an initial modulus of less than 900 cN/tex.
- 11. A tire according to claim 10, in which said circumferentially oriented reinforcing threads have an initial modulus of less than 800 cN/tex.
- 12. A tire according to claim 1, in which said circumferentially oriented reinforcing threads are formed of an assembly of at least one single yarn of nylon associated with at least one aramid single yarn.
Priority Claims (1)
Number |
Date |
Country |
Kind |
99/12745 |
Oct 1999 |
FR |
|
Parent Case Info
[0001] This is a continuation of pending PCT/EP00/09865, filed Oct. 9, 2000.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/EP00/09865 |
Sep 2000 |
US |
Child |
09878808 |
Jun 2001 |
US |