Tire Comprising Banded Carcass Reinforcement Cables

• US 20120298280A1
• Filed: 11/29/2010
• Published: 11/29/2012
• Est. Priority Date: 12/04/2009
• Status: Active Grant

• Current Assignee: Compagnie générale des établissements Michelin, Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Original Assignee: Compagnie générale des établissements Michelin
• Inventors: Domingo, Alain
• Granted Patent: US 9,145,638 B2
• Time in Patent Office: Days
• US Class Current: 152/556
• CPC Class Codes: B60C 1/0041 Compositions of the carcass layers
• CPC Class Codes: B60C 2009/0269 Physical properties or dimensions of the carcass coating rubber
• CPC Class Codes: B60C 2009/0475 Particular materials of the carcass cords
• CPC Class Codes: B60C 2009/0483 Different cords in the same layer
• CPC Class Codes: B60C 9/0007 Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
• CPC Class Codes: B60C 9/005 Reinforcements made of different materials, e.g. hybrid or composite cords
• CPC Class Codes: B60C 9/13 with two or more differing cord materials
• CPC Class Codes: D07B 1/062 the reinforcing cords being characterised by the strand configuration
• CPC Class Codes: D07B 1/0626 the reinforcing cords consisting of three core wires or filaments and at least one layer of outer wires or filaments, i.e. a 3+N configuration
• CPC Class Codes: D07B 1/0633 having a multiple-layer configuration
• CPC Class Codes: D07B 2201/2025 characterised by a value or range of the pitch parameter given
• CPC Class Codes: D07B 2201/2032 compared with the core
• CPC Class Codes: D07B 2201/2046 comprising fillers
• CPC Class Codes: D07B 2201/208 having an open structure
• CPC Class Codes: D07B 2201/2081 having maximum filling
• CPC Class Codes: D07B 2201/2098 characterized by special properties or the arrangements of the binding wire

Abstract

The invention relates to a tire having a radial carcass reinforcement, consisting of at least one layer of metal reinforcing elements, said tire including a top reinforcement, which is covered radially with a tread, said tread being joined to two beads via two sidewalls. According to the invention, the reinforcing elements of at least one carcass reinforcement layer are metal cables which, in the so-called permeability test, have a flow rate less than 20 cm³/mn and at least 10% of said metal cables are banded by a strand consisting of multifilament textile fibers.

Claims

1. A tire having a radial carcass reinforcement, including at least one layer of reinforcing elements, said tire comprising a crown reinforcement, which is itself covered radially with a tread, said tread being joined to two beads via two sidewalls, wherein the reinforcing elements of at least one layer of the carcass reinforcement are metal cords having in what is called the permeability test a flow rate of less than 20 cm3/min, and wherein at least 10% of said metal cords are wrapped with a strand including textile multifilament yarns.

2. The tire according to claim 1, wherein said strand includes textile multifilament yarns having a diameter of less than 0.15 mm.

3. The tire according to claim 1, wherein said metal reinforcing elements of at least one layer of the carcass reinforcement having in what is called the permeability test a flow rate of less than 20 cm3/min are cords having at least two layers and wherein at least one inner layer is sheathed with a layer consisting of a polymeric composition such as a crosslinkable or crosslinked rubber composition.

4. The tire according to claim 1, wherein the cords have in what is called the permeability test a flow rate of less than 10 cm³/min.

6. The tire according to one of claim 1 or 5 wherein said reinforcing elements of at least one layer of the carcass reinforcement are layered metal cords of [L+M] or [L+M+N] construction, comprising a first layer C1 having L threads of diameter d1 where L ranges from 1 to 4, surrounded by at least one intermediate layer C2 having M threads of diameter d2 wound together in a helix with a pitch p2 where M ranges from 3 to 12, said layer C2 being optionally surrounded by an outer layer C3 of N threads of diameter d3 wound together in a helix with a pitch p3 where N ranges from 8 to 20, and wherein a sheath including a crosslinkable or crosslinked rubber composition based on at least one diene elastomer covers, in the [L+M] construction, said first layer C1 and, in the [L+M+N] construction, at least said layer C2.

7. The tire according to claim 6, wherein the diameter of the threads of the first layer C1 is between 0.10 and 0.5 mm, and wherein the diameter of the threads of the layers C2, C3 is between 0.10 and 0.5 mm.

8. The tire according to claim 6, wherein said threads of the outer layer C3 are helically wound with a helix pitch of between 8 and 25 mm.

9. The tire according to one of claims 3 or 5, wherein the diene elastomer is selected from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers, and blends of these elastomers.

10. The tire according to one of claims 3 or 5, wherein the crosslinkable or crosslinked rubber composition based on at least one diene elastomer has, in the crosslinked state, a secant modulus in extension of less than 20 MPa.

11. The tire according to claim 3, wherein said rubber composition is based on at least one diene elastomer.

12. The tire according to claim 1, wherein the cords have in what is called the permeability test a flow rate of less than 2 cm³/min.

14. The tire according to one of claim 3 or 5, wherein the crosslinkable or crosslinked rubber composition based on at least one diene elastomer has, in the crosslinked state, a secant modulus in extension of less than 12 MPa.

5. A tire having a radial carcass reinforcement including at least one layer of reinforcing elements, said tire comprising a crown reinforcement, which is itself covered radially with a tread, said tread being joined to two beads via two sidewalls, wherein the reinforcing elements of at least one layer of the carcass reinforcement are metal cords having at least two layers, at least one inner layer being sheathed with a layer including a polymeric composition such as a crosslinkable or crosslinked rubber composition, and wherein at least 10% of said metal cords are wrapped with a strand including textile multifilament yarns.

13. The tire according to claim 5, wherein said rubber composition is based on at least one diene elastomer.