Bridgestone Corporation

Yoshinori Kuriya

Yujiro Umezawa

Akinori Nagatomo

Takeshi Kobayashi

Kouki Oogaki

Kazunori Kaneda

Kazuya Tsukamoto

Nobumasa Arashiba

This invention provides a rubber composition comprising 1-10 parts by mass of sulfur and 0.1-10 parts by mass of a compound represented by the following general formula (1) or a composition containing the compound as a main component based on 100 parts by mass of a rubber component as well as a pneumatic tire in which at least one of a carcass () and a belt () includes a layer composed of steel cords covered with a coating rubber, characterized in that the above rubber composition is used as the coating rubber covering the steel cords in at least one of the carcass () and the belt (): (wherein R represents a divalent aliphatic group having a carbon number of 1-16 or a divalent aromatic group).

Rubber composition and pneumatic tire using the same

A steel cord for the reinforcement of rubber article has a three-layer twisting construction comprising a core layer comprised of a single steel filament, a first sheath layer comprised of six steel filaments and a second sheath layer comprised of steel filaments subtracted by 1 or 2 filament from maximum steel filament number arranged on a circumscribed circle of the first sheath layer without a wrap filament. In this steel cord, filament diameters of the core layer and the sheath layers satisfy the particular relationships. The steel cord is used in a carcass ply of a heavy duty pneumatic radial tire.

Radial tire with three layer multi-sheath steel carcass cords

Three layer multi-sheath steel cords

A steel cord for the reinforcement of rubber articles comprises a core comprised of three steel filaments, a first sheath formed by twisting nine wave-formed steel filaments around the core, and a second sheath formed by twisting fifteen wave-formed steel filaments around the first sheath in a direction opposite to the twisting direction of the first sheath, in which a forming ratio F.sub.1 of each filament in the first sheath and a forming ratio F.sub.2 of each filament in the second sheath are within a range of 0.75-0.95, respectively, and satisfy Fi.sub.1 &lt;F.sub.2.

Steel cords for the reinforcement of rubber articles

A steel cord for the reinforcement of the carcass of a pneumatic radial tire comprises a central basic layer comprised of 1 to 4 steel filaments, at least one coaxial layer arranged around the central basic layer and comprised of many steel filaments in which these filaments are twisted in the same twisting direction at the same twisting pitch, and a wrap filament spirally wound around the coaxial layer in the same twisting direction.

Steel cords for rubber reinforcement and pneumatic radial tires using

A steel cord for the reinforcement of rubber articles comprises a central basic layer comprised of 1 to 4 steel filaments, at least one coaxial layer arranged around the central basic layer and comprised of many steel filaments in which these filaments are twisted in the same twisting direction at the same twisting pitch, and a wrap filament spirally wound around the coaxial layer in the same twisting direction.

Growing community of inventors

Kodaira, Japan

Yoshinori Kuriya