Rubber component reinforcing-steel cord

A rubber article-reinforcing steel cord in which plural sheath strands each formed by twisting together plural steel filaments are twisted together around at least one core strand formed by twisting together plural steel filaments,

• wherein
• the core strand and the sheath strands are each formed by twisting together one or two core filaments and plural sheath filaments,
• a relationship represented by the following Formula (1) is satisfied when a wire diameter of the core filament(s) of the core strand, a wire diameter of the sheath filaments of the core strand, a wire diameter of the core filaments of the sheath strands, and a wire diameter of the sheath filaments of the sheath strands are defined as dcc, dcs, dsc and dss, respectively:
• dcc>dcs≥dsc>dss (1),
• the core filaments of the core strand and the sheath strands are not twisted, and
• the core strand and the sheath strands have a short axis/long axis ratio of 0.7 to 0.85 in a cross-sectional view taken along a direction perpendicular to the longitudinal direction of the strands.

A rubber article-reinforcing steel cord in which plural sheath strands each formed by twisting together plural steel filaments are twisted together around at least one core strand formed by twisting together plural steel filaments,

• wherein
• the core strand and the sheath strands are each formed by twisting together one or two core filaments and plural sheath filaments,
• a relationship represented by the following Formula (1) is satisfied when a wire diameter of the core filament(s) of the core strand, a wire diameter of the sheath filaments of the core strand, a wire diameter of the core filaments of the sheath strands, and a wire diameter of the sheath filaments of the sheath strands are defined as dcc, dcs, dsc and dss, respectively:
• dcc>dcs≥dsc>dss (1), and
• the core strand and the sheath strands have a (2+m) structure or a (2+m+n) structure in which m=8 to 9 and n=14 to 15.

A rubber article-reinforcing steel cord in which plural sheath strands each formed by twisting together plural steel filaments are twisted together around at least one core strand formed by twisting together plural steel filaments,

• wherein
• the core strand and the sheath strands are each formed by twisting together one or two core filaments and plural sheath filaments,
• a relationship represented by the following Formula (1) is satisfied when a wire diameter of the core filament(s) of the core strand, a wire diameter of the sheath filaments of the core strand, a wire diameter of the core filaments of the sheath strands, and a wire diameter of the sheath filaments of the sheath strands are defined as dcc, dcs, dsc and dss, respectively:
• dcc>dcs≥dsc>dss (1), and
• when the core strand and the sheath strands each comprise two or more sheath filament layers, an average gap between adjacent sheath filaments of a sheath filament layer on the strand radial-direction outer side is larger than an average gap between adjacent sheath filaments of a sheath filament layer on the strand radial-direction inner side.

A rubber article-reinforcing steel cord in which plural sheath strands each formed by twisting together plural steel filaments are twisted together around at least one core strand formed by twisting together plural steel filaments,

• wherein
• the core strand and the sheath strands are each formed by twisting together one or two core filaments and plural sheath filaments,
• a relationship represented by the following Formula (1) is satisfied when a wire diameter of the core filament(s) of the core strand, a wire diameter of the sheath filaments of the core strand, a wire diameter of the core filaments of the sheath strands, and a wire diameter of the sheath filaments of the sheath strands are defined as dcc, dcs, dsc and dss, respectively:
• dcc>dcs≥dsc>dss (1), and
• having a short axis/long axis ratio of 0.80 to 0.95 in a cross-sectional view taken along a direction perpendicular to the longitudinal direction of the steel cord.

A rubber article-reinforcing steel cord in which plural sheath strands each formed by twisting together plural steel filaments are twisted together around at least one core strand formed by twisting together plural steel filaments,

• wherein
• the core strand and the sheath strands are each formed by twisting together one or two core filaments and plural sheath filaments,
• a relationship represented by the following Formula (1) is satisfied when a wire diameter of the core filament(s) of the core strand, a wire diameter of the sheath filaments of the core strand, a wire diameter of the core filaments of the sheath strands, and a wire diameter of the sheath filaments of the sheath strands are defined as dcc, dcs, dsc and dss, respectively:
• dcc>dcs≥dsc>dss (1),
• a relationship represented by the following Formula (2) is satisfied when a tensile strength of the core filament(s) of the core strand, a tensile strength of the sheath filaments of the core strand, a tensile strength of the core filaments of the sheath strands, and a tensile strength of the sheath filaments of the sheath strands are defined as Tcc, Tcs, Tsc and Tss, respectively:
• Tss>Tsc≥Tcs>Tcc (2)
• the core filaments of the core strand and the sheath strands are not twisted, and
• the core strand and the sheath strands have a short axis/long axis ratio of 0.7 to 0.85 in a cross-sectional view taken along a direction perpendicular to the longitudinal direction of the strands.

A rubber article-reinforcing steel cord in which plural sheath strands each formed by twisting together plural steel filaments are twisted together around at least one core strand formed by twisting together plural steel filaments,

• wherein
• the core strand and the sheath strands are each formed by twisting together one or two core filaments and plural sheath filaments,
• a relationship represented by the following Formula (1) is satisfied when a wire diameter of the core filament(s) of the core strand, a wire diameter of the sheath filaments of the core strand, a wire diameter of the core filaments of the sheath strands, and a wire diameter of the sheath filaments of the sheath strands are defined as dcc, dcs, dsc and dss, respectively:
• dcc>dcs≥dsc>dss (1),
• a relationship represented by the following Formula (2) is satisfied when a tensile strength of the core filament(s) of the core strand, a tensile strength of the sheath filaments of the core strand, a tensile strength of the core filaments of the sheath strands, and a tensile strength of the sheath filaments of the sheath strands are defined as Tcc, Tcs, Tsc and Tss, respectively:
• Tss>Tsc≥Tcs>Tcc (2), and
• the core strand and the sheath strands have a (2+m) structure or a (2+m+n) structure in which m=8 to 9 and n=14 to 15.