Hybrid cables with layers which can be used to reinforce tyres

• US 7,594,380 B2
• Filed: 12/27/2004
• Issued: 09/29/2009
• Est. Priority Date: 06/26/2002
• Status: Expired due to Fees

• Current Assignee: Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Original Assignee: Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Inventors: Barguet, Henri, Ducourant, Laurence, Vo, Le Tu Anh, Pottier, Thibaud
• Primary Examiner(s): Johnstone; Adrienne C
• Application Number:
  US11/020,224
• Publication Number:
  US 20050183808A1
• Time in Patent Office: 1,737 Days
• Field of Search: 152/451, 152/527, 152/556, 57220-222, 579/02
• US Class Current: 57/220
• CPC Class Codes: B60C 2015/046 Cable cores, i.e. cores made-up of twisted wires
• CPC Class Codes: B60C 9/005 Reinforcements made of different materials, e.g. hybrid or composite cords
• CPC Class Codes: B60C 9/2003 characterised by the materials of the belt cords
• CPC Class Codes: D02G 3/48 Tyre cords tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606
• CPC Class Codes: D07B 1/0613 the reinforcing cords being characterised by the rope configuration
• CPC Class Codes: D07B 2201/102 including a core
• CPC Class Codes: D07B 2201/1032 three to eight strands respectively forming a single layer
• CPC Class Codes: D07B 2201/1052 using lang lay, i.e. the wires or filaments being inclined relative to the rope axis
• CPC Class Codes: D07B 2201/1068 having the same lay direction
• CPC Class Codes: D07B 2201/2002 characterised by their cross-sectional shape
• CPC Class Codes: D07B 2201/2022 coreless
• CPC Class Codes: D07B 2201/2023 with core
• CPC Class Codes: D07B 2201/2025 characterised by a value or range of the pitch parameter given
• CPC Class Codes: D07B 2201/2039 three to eight wires or filaments respectively forming a single layer
• CPC Class Codes: D07B 2201/2051 characterised by a value or range of the dimension given
• CPC Class Codes: D07B 2201/2055 comprising filaments or fibers
• CPC Class Codes: D07B 2205/2039 Polyesters
• CPC Class Codes: D07B 2205/2046 Polyamides, e.g. nylons
• CPC Class Codes: D07B 2401/2005 Elongation or elasticity
• CPC Class Codes: D07B 2401/201 regarding structural elongation
• CPC Class Codes: D07B 2501/2046 : Tire cords
• CPC Class Codes: D07B 2801/12 : Strand
• CPC Class Codes: D07B 2801/14 : Core
• CPC Class Codes: D07B 2801/24 : Rope
• CPC Class Codes: Y10S 57/902 : Reinforcing or tire cords
• CPC Class Codes: Y10T 428/2936 : Wound or wrapped core or coating [i.e., spiral or helical]
• CPC Class Codes: Y10T 428/296 : Rubber, cellulosic or silicic material in coating

Abstract

A hybrid layered cable for use in tire reinforcement includes a non-metallic internal layer and an unsaturated external layer including 3-12 strands. Each strand is at least partly metallic and is helically wound around the internal layer. Each strand includes at least 3 filaments wound helically together. The cable has a relative elongation at break, measured in tension in accordance with the standard ISO 6892 of 1984, which is higher than 7%.

Claims

1. A hybrid layered cable comprising a non-metallic internal layer forming a core and an unsaturated external layer comprising strands, each strand being at least partly metallic and wound helically over the internal layer, wherein said cable, at break under traction, has a relative elongation which is higher than 7%, wherein the number of strands is from 3 to 12, each strand comprising at least three filaments wound helically at a pitch which is equal to or less than a winding pitch of the strand around the internal layer.

2. The cable according to claim 1, wherein said relative elongation is equal to or higher than 10%.

3. The cable according to claim 2, wherein said relative elongation is equal to or higher than 12%.

4. The cable according to claim 1, wherein said internal layer comprises at least one material having, at break under traction, a relative elongation at 20°

C. which is higher than 6%.

5. The cable according to claim 1, wherein said filaments (f_m, f_a, f_a′

) of each strand (T, T′

, T₁, T₂) and said strands (T, T′

, T₁, T₂) are wound in the same twist direction.

6. The cable according to claim 1, wherein said internal layer forming a core comprises one or more yarns each comprising a multitude of elementary filaments.

7. The cable according to claim 1, wherein said internal layer forming a core comprises one or more folded yarns each comprised of an assembly of several yarns.

8. The cable according to claim 1, wherein said internal layer comprises an aliphatic polyamide.

9. The cable according to claim 8, wherein said internal layer comprises a 6.6 polyamide.

10. The cable according to claim 1, wherein said internal layer comprise an aliphatic polyester.

11. The cable according to claim 10, wherein said internal layer comprises a polyethylene terephthalate or a polyethylene naphthalate.

12. The cable according to claim 1, wherein said internal layer comprises rayon.

13. The cable according to claim 1, wherein said cable comprises N=4 strands (T₁) each consisting of n=6 metallic wires (f_m, f_a), which include a core metallic wire (f_a) around which 5 other metallic wires (f_m) are wound helically.

14. The cable according to claim 1, wherein said cable comprises N=5 strands T₁ each consisting of n=6 metallic wires (f_m, f_a), which include a core metallic wire (f_a) around which 5 other metallic wires (f_m) are wound helically.

15. The cable according to claim 1, wherein said cable comprises N=3 strands (T′

) each consisting of 7 filaments (f_m, f_a′

), which include a non-metallic core filament (f_a′

) around which m=6 metallic wires (f_m) are wound helically.

16. The cable according to claim 1, wherein said cable comprises N=7 strands (T) each consisting of n=3 metallic wires (f_m) twisted together helically.

17. The cable according to claim 1, wherein the internal layer (C_i) has a diameter d_i, d_i′

around which are wound in helix of pitch p_i, p_i′

the strands (T, T′

, T₁, T₂), being N or N′

in number, wherein each strand (T, T′

, T₁, T₂) comprises;

n metallic wires (f_m) of diameter d_e twisted together in helix of pitch p_e, or comprising n-1 wires (f_m) wound with pitch p_e′

around a core wire (f_a) for the strand (T, T′

, T₁, T₂), the cable (C, C₁, C₂) satisfying all the following conditions;

(ai) the internal layer (C_i) is composed of a material having a relative elongation at break during traction at 20°

C. in excess of 6%;

(aii) 0.17≦

d_e (in mm)≦

0.36;

(aiii) 1.1(d_e)≦

d_i (in mm)≦

5(d_e);

(aiv) 3≦

N≦

12;

(av) 3≦

n≦

6;

(avi) 5(d_i)≦

p_e (in mm)≦

20(d_i) or 5(d_i)≦

p_e′

(in mm)≦

20(d_i);

(avii) p_e≦

p_i (in mm)≦

3(p_e) or p_e′

≦

p_i (in mm)≦

3(p_e′

).

18. The cable according to claim 17, wherein said filaments (f_m, f_a, f_a′

) of each strand (T, T′

, T₁, T₂) and said strands (T, T′

, T₁, T₂) are wound in the same twist direction.

19. The cable according to claim 17, wherein said internal layer forming a core consists of a monofilament.

20. The cable according to claim 17, wherein said cable satisfies the following condition:

(aviii) 1.5(p_e)≦

p_i (in mm)≦

2(p_e) or 1.5(p_e′

)≦

p_i (in mm)≦

2(p_e′

).

21. The cable according to claim 17, wherein said cable satisfies the following condition:

(aix) 4≦

p_e≦

p_i (in mm)≦

12 or4≦

p_e′

≦

p_i (in mm)≦

12.

22. The cable according to claim 1, wherein the internal layer (C_i) has a diameter d_i, d_i′

around which are wound in helix of pitch p_i, p_i′

the strands (T, T′

, T₁, T₂), being N or N′

in number, wherein each strand (T, T′

, T₁, T₂) comprises;

m metallic wires (f_m) of diameter d_e′

wound in helix of pitch p_e″

around a non-metallic core filament (f_a″

) of diameter d_fa, the cable (C′

) satisfying all the following conditions;

(bi) the internal layer (C_i) is composed of identical or different materials each having a relative elongation at break during traction at 20°

C. in excess of 6%;

(bii) 0.17≦

d_e′

(in mm)≦

0.36;

(biii) 1.1(d_e′

)≦

d_fa (in mm)≦

3(d_e′

);

(biv) 1.1(d_fa+2(d_e′

))≦

d_i′

≦

3(d_fa+2(d_e′

))

(bv) 3≦

N′

≦

12;

(bvi) 5≦

m≦

12;

(bvii) 10(d_i′

)≦

p_e″

(in mm)≦

20(d_i′

);

(bviii) p_e″

≦

p_i′

(in mm)≦

3(p_e″

).

23. The cable according to claim 22, wherein said filaments (f_m, f_a, f_a′

) of each strand (T, T′

, T₁, T₂) and said strands (T, T′

, T₁, T₂) are wound in the same twist direction.

24. The cable (C′

) according to claim 22, wherein in the core filament (f_a′

) for each strand (T′

) consists of a monofilament.

25. The cable (C′

) according to claim 24, wherein the core filament (f_a′

) comprises an aliphatic polyamide.

26. The cable (C′

) according to claim 25, wherein said core filament (f_a′

) comprises a 6.6 polyamide.

27. The cable (C′

) according to claim 24, wherein said core filament (f_a′

) comprises an aliphatic polyester.

28. The cable (C′

) according to claim 27, wherein said core filament (f_a′

) comprises one of a polyethylene terephthalate or a polyethylene naphthalate.

29. The cable (C′

) according to claim 24, wherein said core filament (f_a′

) comprises rayon.

30. The cable according to claim 22, wherein said cable satisfies the following condition:

(bix) 1.5(p_e″

)≦

p_i′

(in mm)≦

2(p_e″

).

31. The cable according to claim 22, wherein said cable satisfies the following condition:

(bx) 4≦

p_e″

≦

p_i′

(in mm)≦

12.