Steel cord for rubber article reinforcement, and tire
AssigneeBridgestone Corporation
InventorYuusuke Nozaki
Life of this patent
Estimating the term…
Abstract
Provided is a steel cord for rubber article reinforcement, which has both the tensile strength in the cord axial direction and the strength in the shear direction at higher levels. A steel cord (10) for rubber article reinforcement includes: a single core strand (11) having a layer-twisted structure; and plural sheath strands (12) each having a layer-twisted structure, and the sheath strands (12) are twisted around the core strand (11). In the sheath strands (12), a ratio between the diameter of a core filament (12a) and the diameter of a sheath filament (12b) is 0.75 to 0.85, and a ratio between the strength of the core filament (12a) and the strength of the sheath filament (12b) is 0.55 to 0.7.
Claims20
A steel cord for rubber article reinforcement, comprising:
- a single core strand having a layer-twisted structure formed by twisting plural steel filaments;
- and
- plural sheath strands each having a layer-twisted structure formed by twisting plural steel filaments,
- which sheath strands are twisted around the core strand,
- wherein
- a ratio between a diameter of a core filament and a diameter of a sheath filament in the sheath strands is 0.75 to 0.85, and
- a ratio between a strength of the core filament and a strength of the sheath filament in the sheath strands is 0.55 to 0.7.
Dependencies are inferred from the claim text.