Bridgestone Corporation

Takahisa Shizuku

Masami Kikuchi

Wataru Seki

Katsuhiro Kobayashi

Hiroshi Shima

Norihiko Kaga

Takashi Yokoi

Nobuhiro Ando

Yukio Aoike

Satoshi Aizawa

Kenichi Higashi

Provided is an elastomer reinforcement cord in which the problem of stress concentration at an interface between an elastomer and a metal cord is solved and the durability is thereby improved. The elastomer reinforcement cord includes metal filaments () and (), and a polymer material () having a melting point or softening point of 80° C. to 160° C. The elastomer reinforcement cord has a core () and at least one sheath layer (). In a region surrounded by a line connecting the centers of the metal filaments constituting the outermost sheath layer at a cross-section in a direction orthogonal to an axial direction after vulcanization, when a region occupied by other than the metal filaments is defined as a gap region, the polymer material is contained in this gap region, and a filling rate, which is a ratio of the area of the polymer material, is higher than 120%, taking the area of the gap region as 100%.

Elastomer reinforcement cord

Provided is an elastomer reinforcement cord with improved rust inhibition. An elastomer reinforcement cord () includes metal filaments and a polymer material. The elastomer reinforcement cord () has a multi-strand structure which includes: at least one core strand () formed by twisting plural metal filaments () and () together; and two or more sheath strands () each formed by twisting plural metal filaments () and () together, and in which the sheath strands are twisted together around the core strand. In a region surrounded by a line connecting the centers of the metal filaments constituting the outermost sheath layer of the core strand at a cross-section in a direction orthogonal to an axial direction after vulcanization of the core strand, when a region occupied by other than the metal filaments is defined as a gap region, a filling rate, which is a ratio of the area of the polymer material with respect to the gap region, is 52% to 120%.

Cord for elastomer reinforcement use

Provided is a tire in which a steel cord applied to a carcass ply has improved corrosion resistance to water penetration, fretting resistance, and cord untwisting resistance. Provided is a tire including a carcass ply () as a skeleton. The carcass ply is reinforced by a steel cord including no wrapping filament. The steel cord is composed of a plurality of steel filaments having 3 or more core filaments, at least a part of the surface of each of the plurality of steel filaments is coated with a resin material containing at least an ionomer, and when a resin component contained in the resin material is composed of a single resin, the melting point of the resin material is 150&#xb0; C. or less, and when the resin component is composed of a composition containing two or more resins, the softening point of the resin material is 150&#xb0; C. or less.

Tire

A cord for reinforcing elastomers excellent in adhesion to elastomers such as rubber is provided. The cord is a cord for reinforcing elastomers () that includes metallic filaments () and a resin filament () twisted together, the resin filament () being made from a polymeric material having a melting point or softening point of 80 to 160&#xb0; C. The cord for reinforcing elastomers includes a core and at least one sheath layer, wherein, after vulcanization, a distance w between metallic filaments () forming an outermost sheath layer is 100 &#x3bc;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 () derived from the resin filament () 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 () within a region formed by connecting the centers of the individual metallic filaments () constituting the outermost sheath layer.

Cord for reinforcing elastomers

Provided is a method for manufacturing a brass-plated steel wire in which improvement in the quality of the brass-plated steel wire and energy saving in the manufacturing process are balanced and a brass-plated steel wire obtained by the method. The method is a method for manufacturing a brass-plated steel wire comprising a plating process in which a steel wire rod is brass plated and a final wire drawing process in which the obtained brass-plated steel wire rod is subjected to a final drawing. The method includes a zinc oxide removing process in which the amount of zinc oxide on the surface of the brass-plated steel wire rod is made smaller than 50 mg/mbefore the final wire drawing process.

Method for manufacturing brass-plated steel wire and brass-plated steel wire

A seismic isolation apparatus features damping characteristics equivalent to or better than prior art, without burdening the environment. In this seismic isolation apparatus, a cylindrical cavity portion is formed at the middle of an outer side laminated body, which has a form in which respective pluralities of resiliently deformable rubber rings and metal rings for maintaining rigidity are alternately laminated. A helically formed coil spring is disposed in this cavity portion so as to be snugly fitted. An inner side laminated body, which has a form in which respective pluralities of resiliently deformable rubber plates and metal plates for maintaining rigidity are alternately laminated, is disposed at an inner peripheral side of the coil spring.

Seismic isolation apparatus

Methods and devices for measuring elongation, wear, and internal temperature of a conveyor belt to catch signs of conveyor belt failure such as breakage by detecting a magnetic field from a magnetic body by using a magnesium sensor, as well as a rubber magnet sheet as a magnetic body and a method of producing the sheet, the rubber magnet sheet being able to be used while it is embedded in the conveyor belt. To measure elongation of a running conveyor belt (), a magnetic field of a magnetic body () embedded in the belt () is detected by a magnetism sensor () fixed to the earth, and elongation of the belt () is calculated from temporal variation of the detected magnetic field.

Method and device for measuring conveyor belt elongation, method and device for measuring conveyor belt wear extent, method and device for measuring conveyor belt temperature, rubber magnet sheet, and method of producing rubber magnet sheet

There is provided an apparatus for measuring forces acted upon a tire in which a radial force and a peripheral force acting to the tire, which are required for the high precision measurement of a friction coefficient on a road surface, are simply measured in a high precision by detecting a magnetic field formed by a magnet fixed to a tread portion of the tire by a magnetic sensor fixed to a rim and measuring the forces acting to the tire from a variant pattern of a magnetic flux density detected un the rotation of the tire and without influencing upon the balance of the tire, which contributes to the high precision measurement of the friction coefficient on the road surface.

Growing community of inventors

Kodaira, Japan

Takahisa Shizuku