Breaking energy test performance of lightweight tyres that have a good performance in terms of rolling resistance and having a nominal width at least equal to 135 mm and at most equal to 235 mm is increased. These tyres comprise two thin and lightened working layers (41, 42) comprising metal reinforcing elements (411, 421) made up of monofilaments having a linear breaking strength Rct at least equal to 300 daN/cm and at most equal to 400 daN/cm, and a single carcass layer (6) radially on the inside of the working layers. In order to improve performance in the breaking energy test, this carcass layer comprises textile reinforcing elements and has surface breaking energy at least equal to 1.75 J/cm.sup.2.

A pneumatic tire that can improve high speed durability while reducing a tire weight is provided. The pneumatic tire comprises a carcass, a belt layer comprising a cord inclined to a tire circumferential direction and arranged on the periphery of a crown of the carcass, and a belt reinforcing layer comprising an organic fiber cord arranged on the periphery of the belt layer along a tire circumferential direction. The organic fiber cord comprises an aromatic polyamide fiber having a fineness of 500 to 3,000 dtex, and has a single twist construction having a twist coefficient of 800 to 2,000.

Provided is a tire reinforcing member that can further improve various tire performances, such as steering stability and ride comfort. Also provided is a tire in which various tire performances, such as steering stability and ride comfort, are further improved by the use of the tire reinforcing member. A tire reinforcing member (10) is formed by laminating two or more layer members (3) each obtained by covering elongated fiber materials (1) with a polymer material (2). The layer members each have a thickness of 0.01 mm to 0.5 mm, and the whole reinforcing member has a thickness of 0.5 mm to 2.0 mm.

Provided are: a rubber article-reinforcing steel cord having excellent corrosion resistance; and a method of producing the same with excellent productivity. In a rubber article-reinforcing steel cord (1), plural sheath strands (3) each formed by twisting together plural steel filaments are twisted together around at least one core strand (2) formed by twisting together plural steel filaments. Brass plating is performed on the steel filaments, and zinc plating is further performed on at least the outer circumference of the brass plating of outermost-layer steel filaments of the sheath strands (3).

The vulcanized rubber of the present invention is a vulcanized rubber, which is formed from a rubber composition containing a rubber component containing a dienic rubber, and a vulcanizing agent, and has a tensile modulus of elasticity at 25% elongation at 100 C. of 1.2 MPa or more, with a ratio of an Sx bond (where x is 3 or more) to all sulfide bonds being 30% or less. The vulcanized rubber, the tire and the run-flat tire of the invention are excellent in durability life.

The present invention provides a tire improved in the run flat durability, having at least one member selected from the group consisting of a side reinforcing rubber layer and a bead filler using a rubber composition having a tensile stress at 50% elongation at 180 C. (M50) of 6.2 MPa or more as a vulcanized rubber physical property.

Breaking energy test performance of lightweight tyres that have a good performance in terms of rolling resistance is increased. These tyres comprise two thin and lightened working layers (41, 42) comprising metal reinforcing elements (411, 421) having a linear breaking strength Rct at most equal to 400 daN/cm, and a single carcass layer (6) radially on the inside of the working layers. In order to successfully undergo the breaking energy test, this carcass layer comprises textile reinforcing elements that have an elongation at break Acc at least equal to 15%, the carcass layer having a linear breaking strength Rcc at least equal to 0.55 times the linear breaking strength of the working layers.

A tungsten wire according one aspect of the present disclosure includes: a metal wire containing one of tungsten and a tungsten alloy; and a plating layer which covers a surface of the metal wire. The plating layer contains copper.

The invention relates to a pneumatic vehicle tire having two or more belt plies which have reinforcement members crossing one another at an angle, wherein the reinforcement members within each belt ply are arranged substantially parallel to and spaced apart from one another and are embedded in rubber material, wherein the belt has at least one first belt ply, the reinforcement members of which are formed by steel monofilaments of the reinforcement member class Ultra-Tensile (UT) with in each case a tensile strength of 3080 N/mm.sup.2 to 4190 N/mm.sup.2, wherein the steel monofilaments have a diameter D of 0.33 mm to 0.37 mm. It is the object of the invention to provide, at lower cost, a pneumatic vehicle tyre with low rolling resistance, by way of simultaneously simplified production. This is achieved in that the steel monofilaments have a torsion value of approximately zero windings in the case of a length dimension of 200 times the diameter of the steel monofilament.

A cord for reinforcing elastomers excellent in adhesion to elastomers such as rubber is provided. The cord is a cord for reinforcing elastomers (10) that includes metallic filaments (1) and a resin filament (2) twisted together, the resin filament (2) being made from a polymeric material having a melting point or softening point of 80 to 160 C. The cord for reinforcing elastomers includes a core and at least one sheath layer, wherein, after vulcanization, a distance w between metallic filaments (1b) forming an outermost sheath layer is 100 m or less, and, on a cross section of the cord taken along a direction orthogonal to an axial direction, a filling ratio, which is a ratio of an area of a polymeric material (3) derived from the resin filament (2) to a gap region is 52 to 120%, where the gap region is defined as a portion occupied by a material other than the metallic filaments (1) within a region formed by connecting the centers of the individual metallic filaments (1b) constituting the outermost sheath layer.