Three-layered metal cable for tire carcass reinforcement
AssigneeMichelin Recherche et Technique S.A.
InventorsHenri Barguet, Alain Domingo, Arnaud Letocart, Thibaud Pottier
Life of this patent
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Abstract
In a multi-strand steel cable, at least three layers are present. An inner layer includes from 1 to 4 wires. An intermediate layer surrounds the inner layer and includes from 3 to 12 wires wound together in a helix at a pitch p2. An outer layer surrounds the intermediate layer and includes from 8 to 20 wires wound together in a helix at a pitch p3. A rubber sheath covers at least the intermediate layer and is formed of a cross-linkable or cross-linked rubber composition that includes at least one diene elastomer.
Claims25
A multi-strand steel cable comprising, as an elementary strand, a three-layered cable, wherein the three-layered cable includes:
- an inner layer C1, which includes from 1 to 4 wires L having a diameter d1;
- an intermediate layer C2, which surrounds the inner layer C1, wherein the intermediate layer C2 includes from 3 to 12 wires M having a diameter d2, and wherein the wires M are wound together in a helix at a pitch p2;
- an outer layer C3, which surrounds the intermediate layer C2, wherein the outer layer C3 includes from 8 to 20 wires N having a diameter d3, wherein the wires N are wound together in a helix at a pitch p3, and wherein the wires M of the intermediate layer C2 and the wires N of the outer layer C3 are wound in a same direction of twist;
- and
- at least one of:
- a first rubber sheath, which is positioned between the inner layer C1 and the intermediate layer C2, and a second rubber sheath, which is positioned between the intermediate layer C2 and the outer layer C3, wherein the first and second rubber sheaths are formed of a cross-linkable or cross-linked rubber composition that includes at least one diene elastomer.
Dependencies are inferred from the claim text.