Bridgestone Corporation

Bridgestone Corportion

Kiyoshi Ikehara

Kiyohito Kawasaki

Manabu Yanagisawa

Shuichi Matsuo

Tsutomu Nakamura

Sumito Nakagawa

Teppei Shibata

Hiroki Ishizaka

A high pressure hose with a reinforcing steel cord having twisted steel filaments. A first condition is a condition in which a winding direction of a steel cord in an N(N&#x2265;1) steel cord reinforced layer and in an (N+1)steel cord reinforced layer are different, and a winding direction of a steel cord in a first steel cord reinforced layer () and a twisting direction of an outermost layer steel filament in the steel cord in the first steel cord reinforced layer () are different. A second condition is a condition in which the twisting direction of the outermost layer steel filament in the steel cord in the first steel cord reinforced layer () and of an outermost layer steel filament in a steel cord in a second steel cord reinforced layer () are identical. The first condition and second condition are not simultaneously satisfied.

High pressure hose

A rubber crawler including: an endless belt shaped rubber belt; a main cord layer that is disposed within the rubber belt, that is configured by plural main cords extending along a crawler peripheral direction and arranged side-by-side in a crawler width direction, and that is formed with an overlapping portion where both end, sides in the crawler peripheral direction overlap one another in a crawler thickness direction; and a stretching and contracting portion that is formed at the overlapping portion of the main cords, and is capable of stretching and contracting more in the crawler peripheral direction than other portions of the main cords, wherein the stretching and contracting portion includes a curved portion where the main cords are curved with an amplitude in the crawler width direction as viewed along the crawler thickness direction.

Crawler

A steel cord has a multi-twist structure in which N (N=2 to 8) strandsare twisted, each strandbeing formed by twisting a plurality of element wiresand having a substantially elliptical cross-section, wherein d/d&#x3e;1.08 is satisfied, where the major diameter of the strandis represented by dand the minor diameter is represented by d, and &#x3b5;defined by the following equation: &#x3b5;=&#x221a;(&#x2212;b/2+&#x221a;(b/4&#x2212;c))&#x2212;1 (in the equation, b represents &#x2212;1+&#x3c0;(&#x2212;4R+d)/P, c represents &#x3c0;dk(4&#x3c0;R+P)/P, R represents (D&#x2212;d)/2, k represents tan(&#x3c0;/2&#x2212;&#x3c0;/N), and d represents (d+d)/2) satisfies &#x3b5;&#x3e;0.005, where the diameter of a circle circumscribing the cord is represented by D (mm) and the twist pitch of the cord is represented by P (mm).

Steel cord, composite of rubber and steel cord, and tire

Provided is a pneumatic radial tire including a carcass layer composed of a carcass plyand a spiral belt layercomposed of steel cords wound spirally substantially in parallel with each other to a tire equator surface. When the ratio of spacing Rbetween adjacent steel cords of the spiral belt layeris shown by R=(50&#x2212;E&#xd7;ds)/50, the ratio of spacing Ris 0.45 or less as well as the total sectional area S of the steel cords applied per 50 mm width of the spiral belt layer is 7.5 mmor less (E shows the number of steel cords applied per 50 mm width of the spiral belt layer, and ds shows the diameter (mm) of each steel cord). The number of steel cords E applied per 50 mm of width ranges from 66 to 200.

Pneumatic radial tire with spiral belt layer for two-wheeled motor vehicle

A motorcycle tire having excellent belt cord durability, high-speed durability, impact force absorbability, running stability and uniformity performances is produced by constituting a belt with a low-cost steel cord member having a specified twisting construction of 2 to 7 filaments and a specified space between the mutual filaments over a full length of the cord in the belt.

Motorcycle tires and method of producing the same

A steel cord for reinforcing a rubber product has a multilayer structure consisting of two or more layers including a core, or a structure consisting of seven or more strands twisted in the same direction at the same pitch. In the steel cord, at least one of three strands that are successively adjacent to one another or that are in mutual contact is formed of two filaments that are paired substantially parallel to each other. The direction of pairing the two filaments of each strand is substantially the same over the entire length of the cord. Each of the remaining strands is formed of a single filament.

Steel cord for reinforcing a rubber product and pneumatic tire using the

A steel cord is disclosed, which has a core-sheath double layer structure having a 2+7 cord construction or a 2+8 cord construction. A twisting direction of the core is the same as that of the sheath, a forming rate Rc of filaments of the core is 103 to 120%, and a forming rate Rs of filaments of the sheath is 102 to 115%. A pneumatic radial tire using such steel cords in a belt layer is also disclosed.

Rubber article-reinforcing steel cords and pneumatic tires using such

A steel cord for reinforcing rubber articles comprises one wave-form or helical core steel filament and five to eight sheath steel filaments disposed around the core steel filament, the pitch Pc of the core steel filament is 3.0 dc/0.34.ltoreq.Pc.ltoreq.10.0 dc/0.34 (dc=diameter of steel core filament) and the core forming ratio Rc=Lc/dc (Lc is an amplitude of the wave or helix of the core steel filament) is within a particular range varying depending on the number of sheath steel filaments. A pneumatic tire contains a cross belt reinforced with the above-mentioned steel cords where

Pneumatic tire having cross belt layer reinforced with specified steel

A steel cord for reinforcing rubber articles comprises one wave-form or helical core steel filament and five to eight sheath steel filaments disposed around the core steel filament, the pitch Pc of the core steel filament is 3.0 dc/0.34.ltoreq.Pc.ltoreq.10.0 dc/0.34 (dc=diameter of steel core filament) and the core forming ratio Rc=Lc/dc (Lc is an amplitude of the wave or helix of the core steel filament) is within a particular range varying depending on the number of sheath steel filaments. A pneumatic tire contains a cross-belt reinforced with the above-mentioned steel cords where

A steel cord is disclosed, which has a core-sheath double layer structure having a 2+7 cord construction or a 2+8 cord construction. A twisting direction of the core is the same as that of the sheath, a forming rate Rc of filaments of the core is 103 to 120% and a forming rate Rs of filaments of the sheath is 102 to 115%. A pneumatic radial tire using such steel cords in a belt layer is also disclosed.

A steel cord for reinforcing rubber articles comprises one wave-form or helical core steel filament and a plurality of sheath steel filaments disposed around the core steel filament, the pitch Pc of the core steel filament is 3.0 dc/0.34.ltoreq.Pc.ltoreq.10.0 dc/0.34 (dc=diameter of steel core filament) and the core forming ratio Rc=Lc/dc (Lc is an amplitude of the wave or helix of the core steel filament) is within a particular range varying depending on the number of sheath steel filaments. The rubber articles containing the steel cord have an improved resistance to corrosion propagation and a high strength. A pneumatic tire is reinforced with the above-mentioned steel cord and contains a cross belt layer where

Steel cord

A pneumatic radial tire for truck and bus comprises a carcass ply containing cords arranged substantially in a radial direction of the tire and a belt superimposed about said carcass ply and comprised of plural belt layers each containing steel cords arranged at a cord angle of 5.degree.-20.degree. with respect to an equator of the tire. In this case, the steel cord for the belt layer has a two-layer structure of a core comprised of two steel filaments and a single sheath comprised of 6-8 steel filaments and satisfies the particularly relationships on filament diameter, twisting pitch, bending rigidity, tensile strength and distance between adjoining cords.

Pneumatic radial tires with core-sheath steel belt cords

A steel cord comprising a core and a sheath arranged around the core. The core consists of two steel filaments, and the sheath consists of eight steel filaments. The diameter of each of the filaments is in a range from 0.30 to 0.42 mm, and a difference D.sub.c -D.sub.s between the diameter D.sub.c of the filaments of the core and that D.sub.s of the sheath is not less than 0.04 mm. The twisted direction of the core is the same as that of the sheath, and a ratio P.sub.s /P.sub.c between a pitch P.sub.s of the sheath and that of P.sub.c of the core is in a range from 1.4 to 3.0.

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Tokyo, Japan

Kiyoshi Ikehara