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US 6,863,103 B1Granted
Steel cord for the reinforcement of a rubber article and tire
AssigneeBridgestone Corporation
InventorsHideki Masubuchi, Yukimasa Fukuda
Life of this patent
Estimating the term…
Abstract
A steel cord having a strand construction formed by twisting a plurality of sheath strands each formed by twisting plural filaments around a core strand formed by twisting plural filaments is provided. At least one of the core strand and the sheath strands has a construction of twisting one or more sheath layers each made of plural filaments around a core made of one or plural filaments, and a diameter of a filament constituting an outermost sheath layer is made larger than that of a filament constituting at least one layer located inside thereof, whereby precedent breakage in a part of the filaments is avoided to improve the durability of the steel cord.
Claims30
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments, and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein each of the sheath strands is formed by twisting outer and inner sheath layers made of plural filaments around a core made of at least one filament, all of the filaments constituting each sheath layer of each sheath strand have the same diameter, a diameter of the filaments of the outer sheath layer of each sheath strand is larger than a diameter of the filaments of the inner sheath layer located inside the outer sheath layer, and a diameter of the filaments of the inner sheath layer of each sheath strand is larger than a diameter of the at least one filament of the core located inside the inner sheath layer.
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments, and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the core strand is formed by twisting outer and inner sheath layers made of plural filaments around a core made of three filaments, all of the filaments constituting each sheath layer of the core strand have the same diameter, and a diameter of every filament constituting the outer sheath layer of the core strand is larger than a diameter of every filament constituting the inner sheath layer located inside the outer sheath layer and a diameter of every filament constituting the core located inside the inner sheath layer.
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments, and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein each of the core strand and the sheath strand is formed by twisting outer and inner sheath layers made of plural filaments around a core made of three filaments, all of the filaments constituting each sheath layer of each of the core strand and the sheath strands have the same diameter, and a diameter of every filament constituting the outer sheath layer of each of the core strand and the sheath strands is larger than a diameter of every filament constituting the inner sheath layer located inside the outer sheath layer and a diameter of every filament constituting the core located inside the inner sheath layer.
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments, and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- characterized in that each of the sheath strands is formed by twisting two sheath layers made of plural filaments around a core made of one or more filaments, and all of the filaments constituting each sheath layer of each sheath strand have the same diameter and a diameter of every filament constituting an outermost sheath layer of each sheath strand is larger than a diameter of every filament constituting every layer located inside the outermost sheath layer, and when a diameter of a filament constituting an outermost sheath layer in the sheath strand is φs (mm) and a diameter of a circumcircle inscribing all filaments in the outermost sheath layer is Φ (mm), they satisfy a relation of 0.55≦Φ/6.14φs≦0.90, and when a diameter of a filament constituting an outermost sheath layer in the core strand is φc (mm), it satisfies a relation of φs≦φc.
A tire comprising a carcass toroidally extending between a pair of bead portions as a skeleton and a belt disposed on an outside of the carcass in a radial direction and comprised of plural belt layers, and steel cords applied to at least one of the carcass and the belt layers,
- wherein the steel cords comprise a core strand and a plurality of sheath strands, each formed by twisting a plurality of filaments, wherein each of the core strand and the sheath strands is formed by twisting outer and inner sheath layers made of plural filaments around a core made of at least one filament, all of the filaments constituting each sheath layer of each of the core strand and the sheath strands have the same diameter, a diameter of every filament of the outer sheath layer of each of the core strand and the sheath strands is larger than a diameter of every filament of the inner sheath layer located inside the outer sheath layer, and a diameter of every filament of the inner sheath layer of each of the core strand and the sheath strands is larger than a diameter of the at least one filament of the core located inside the inner sheath layer.
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments;
- wherein the core strand is formed by twisting a sheath layer made of plural filaments around a core made of three filaments, and all of the filaments constituting the sheath layer of the core strand have the same diameter, which is larger than a diameter of the filaments constituting the core strand, and
- wherein a ratio of total sectional area of all filaments constituting the core strand to area of a circumcircle formed by filaments constituting the sheath layer is not less than 0.715.
2 more elements
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the core strand is formed by twisting two sheath layers made of plural filaments around a core made of three filaments, all of the filaments constituting each sheath layer of the core strand have the same diameter, and a diameter of every filament constituting an outermost sheath layer of the core strand is larger than a diameter of every filament constituting the core of the core strand, and
- wherein a ratio of total sectional area of all filaments constituting the core strand to area of a circumcircle formed by filaments constituting the outermost sheath layer is not less than 0.730.
2 more elements
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein each of the core strand and the sheath strands is formed by twisting a sheath layer made of plural filaments around a core made of three filaments, all of the filaments constituting the sheath layer of each of the core strand and the sheath strands have a diameter larger than that of the every filament constituting the core of each of the core strand and the sheath strands, and
- wherein for each strand, a ratio of total sectional area of all filaments constituting the strand to area of a circumcircle formed by filaments constituting the sheath layer is not less than 0.715.
2 more elements
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein each of the core strand and the sheath strands is formed by twisting two sheath layers made of plural filaments around a core made of three filaments, all of the filaments constituting each sheath layer of each of the core strand and the sheath strands have the same diameter, and a diameter of every filament constituting an outermost sheath layer of each of the core strand and the sheath strands is larger than a diameter of every filament constituting the core of each of the core strand and the sheath strands, and
- wherein for each strand, a ratio of total sectional area of all filaments constituting the strand to area of a circumcircle formed by filaments constituting the outermost sheath layer is not less than 0.730.
2 more elements
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the core strand is formed by twisting one or two sheath layers made of plural filaments around a core made of three filaments, all of the filaments constituting each sheath layer of the core strand have the same diameter, and a diameter of every filament constituting an outermost sheath layer of the core strand is larger than a diameter of every filament constituting the core of the core strand, and
- wherein a distance between mutual steel filaments in each layer of each strand is not more than 0.014 mm.
2 more elements
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the sheath strands are formed by twisting two sheath layers each made of plural filaments around a core made of three filaments, all of the filaments constituting an outermost sheath layer of each sheath strand have the same diameter, and when a diameter of a filament constituting an outermost sheath layer in the sheath strands is φs (mm) and a diameter of a circumcircle inscribing all filaments in the outermost sheath layer is Φ (mm), they satisfy a relation of 0.55≦Φ/6.14φs≦0.90, and when a diameter of a filament constituting an outermost sheath layer in the core strand is φc (mm), it satisfies a relation of φs≦φc, wherein all filaments other than filaments constituting the outermost sheath layer in the sheath strands has the same diameter.
1 more element
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the sheath strands are formed by twisting two sheath layers each made of plural filaments around a core made of three filaments, all of the filaments constituting an outermost sheath layer of each sheath strand have the same diameter, and when a diameter of a filament constituting an outermost sheath layer in the sheath strands is φs (mm) and a diameter of a circumcircle inscribing all filaments in the outermost sheath layer is Φ (mm), they satisfy a relation of 0.55≦Φ/6.14φs≦0.90, and when a diameter of a filament constituting an outermost sheath layer in the core strand is φc (mm), it satisfies a relation of φs≦φc, wherein all filaments other than filaments constituting the core in the sheath strands have the same diameter.
1 more element
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the sheath strands are formed by twisting two sheath layers each made of plural filaments around a core made of three filaments, all of the filaments constituting an outermost sheath layer of each sheath strand have the same diameter, and when a diameter of a filament constituting an outermost sheath layer in the sheath strands is φs (mm) and a diameter of a circumcircle inscribing all filaments in the outermost sheath layer is Φ (mm), they satisfy a relation of 0.55≦Φ/6.14φs≦0.90, and when a diameter of a filament constituting an outermost sheath layer in the core strand is φc (mm), it satisfies a relation of φs≦φc, wherein all filaments other than filaments constituting an outermost sheath layer in the core strand have the same diameter.
1 more element
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the sheath strands are formed by twisting two sheath layers each made of plural filaments around a core made of three filaments, all of the filaments constituting an outermost sheath layer of each sheath strand have the same diameter, and when a diameter of a filament constituting an outermost sheath layer in the sheath strands is φs (mm) and a diameter of a circumcircle inscribing all filaments in the outermost sheath layer is Φ (mm), they satisfy a relation of 0.55≦Φ/6.14φs≦0.90, and when a diameter of a filament constituting an outermost sheath layer in the core strand is φc (mm), it satisfies a relation of φs≦φc, wherein all diameter other than filaments constituting the core in the core stand have the same diameter.
1 more element
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein the sheath strands are formed by twisting two sheath layers each made of plural filaments around a core made of three filaments, all of the filaments constituting an outermost sheath layer of each sheath strand have the same diameter, and when a diameter of a filament constituting an outermost sheath layer in the sheath strands is φs (mm) and a diameter of a circumcircle inscribing all filaments in the outermost sheath layer is Φ (mm), they satisfy a relation of 0.55≦Φ/6.14φs≦0.90, and when a diameter of a filament constituting an outermost sheath layer in the core strand is φc (mm), it satisfies a relation of φs≦φc, wherein all filaments constituting the core strand have the same diameter.
1 more element
A steel cord for the reinforcement of a rubber article comprising:
- a core strand formed by twisting a plurality of filaments;
- and
- a plurality of sheath strands arranged around the core strand and each formed by twisting a plurality of filaments,
- wherein each of the core strand and the sheath strands is formed by twisting one or two sheath layers made of plural filaments around a core made of three filaments, all of the filaments constituting each sheath layer of each of the core strand and the sheath strands have the same diameter, and a diameter of every filament constituting an outermost sheath layer of each of the core strand and the sheaths strands is larger than a diameter of every filament constituting the core of each of the core strand and the sheath strands, and
- wherein a distance between mutual steel filaments in each layer of the strand is not more than 0.014 mm.
2 more elements
Dependencies are inferred from the claim text.