Radial tire for heavy load and metal cord user therefor
AssigneeSumitomo Rubber Industries, Ltd.
InventorsShinichi Miyazaki, Kazumi Yamazaki, Osamu Toda
Life of this patent
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Abstract
The invention improves rubber permeability while making a cord diameter compact. A metal cord is constituted by a layered structure having a core comprising totally 6 to 12 filaments sectioned into 1 to 4 filament bundles, and a sheath comprising 8 to 15 filaments arranged around the core. Each of the filament bundles includes a waved filament modeled in a two-dimensional wave shape and a non-waved filament, in a state before being bundled. The core makes the wave of the waved filament three-dimensional within the core by applying torsion to each of the filament bundles.
Claims11
A radial tire for a heavy load comprising:
- a carcass extending to a bead core of a bead portion from a tread portion via a side wall portion;
- and
- a belt layer arranged inside the tread portion and outside the carcass,
- wherein a carcass cord of said carcass is constituted by a metal cord having a core comprising totally 6 to 12 filaments sectioned into 1 to 4 filament bundles, and a sheath comprising 8 to 15 filaments arranged around the core,
- wherein each of said filament bundles includes a waved filament modeled in a two-dimensional wave shape having crests and troughs repeatedly and a non-waved filament, in a state before being bundled, and
- wherein said core makes the wave of said waved filament three-dimensional within the core by applying a torsion to each of the filament bundles.
A metal cord comprising:
- a core comprising totally 6 to 12 filaments sectioned into 1 to 4 filament bundles, and a sheath comprising 8 to 15 filaments arranged around the core,
- wherein each of said filament bundles includes a waved filament modeled in a two-dimensional wave shape having crests and troughs repeatedly and a non-waved filament, in a state before being bundled, and
- wherein said core makes the wave of said waved filament three-dimensional within the core by applying a torsion to each of the filament bundles.
Dependencies are inferred from the claim text.