Provided is a steel cord for rubber article reinforcement which has excellent corrosion resistance and productivity without deterioration of adhesion with rubber. A steel cord (1) for rubber article reinforcement, in which plural steel filaments (2) are twisted together, includes: a core having at least one core filament (2c); and a sheath having at least one sheath layer formed by twisting at least one sheath filament (2s) around the core. In this steel cord (1), brass plating is performed on the steel filaments (2) and zinc plating is further performed on the outer circumference of the brass plating of the core filament (2c), and the steel filaments (2) have a diameter d of 0.1 mm to 0.6 mm.

A pneumatic tire includes a pair of sidewalls, a pair of bead portions, and a circumferential tread having a plurality of circumferential ribs and a plurality of circumferential grooves. A reinforcing layer is disposed in at least one of the plurality of circumferential ribs. No part of the reinforcing layer extends directly below a bottom surface of any of the plurality of circumferential grooves. The reinforcing layer has a consistent gauge along its entire lateral width. A top surface of the reinforcing layer is located radially higher than the bottom surface of each of the plurality of circumferential grooves.

A tire having four belt plies laminated at an outside circumference of the carcass. Cords at second and third belt plies among the four belt plies, as numbered from the carcass to the outside circumference, intersect, being inclined in mutually opposite fashion with respect to a tire axis. Angles of inclination with respect to the tire circumferential direction of the second and third belt plies are such that an angle at a belt end is less than an angle at a tire equator. A first mounded region that has a peak at which the angle of inclination is greater than at a periphery and that corresponds to a shoulder rib which among the plurality of ribs is provided. The peak at the first mounded region is arranged at a shoulder rib region which appears to overlap the shoulder rib as seen in plan view.

The subject of the invention is a cord (50) comprising a single layer (52) of helically wound metal filamentary elements (54). The metal filamentary elements define an internal enclosure (58) of the cord of diameter Dv. Each metal filamentary element (54) has a diameter Df and a helix radius of curvature Rf.

With Dv, Df and Rf being expressed in millimetres, the cord satisfies the following relationships:

9≤Rf/Df≤30, and

1.30≤Dv/Df≤2.10.

A resin-metal composite member for a tire, the member including: a metal member; an adhesive layer; and a covering resin layer in this order, wherein: the adhesive layer includes a continuous phase containing a polyester-based thermoplastic elastomer having a polar functional group, and a discontinuous phase containing a styrene-based elastomer, and a ratio of the continuous phase with respect to an entirety of the adhesive layer is from 60% by mass to 93% by mass.

A manufacturing apparatus of a rubber sheet containing a steel cord, including a feeding device which feeds the steel cord while keeping a specified tension; a forming device which winds the steel cord being fed by the feeding device around engagement parts spaced from each other with a predetermined width; and a placement device which places on a rubber sheet member, the steel cord wound around the engagement parts with the predetermined width. The forming device includes forming parts which press bent portions of the steel cord wound around the engagement parts to form a bending shape of the bent portions, and the placement device includes a plurality of retaining parts disposed in two rows spaced apart from each other with the predetermined width to retain the bent portions in a state in which the steel cord having the bending shape is placed on the rubber sheet member.

A method for manufacturing a straight steel monofilament for the reinforcement of belt ply of a pneumatic tyre, where the arc-height of the straight steel monofilament is less than 30 mm. The steel monofilament is plastically deformed by a twisting along the axis of the steel monofilament on a double-twist apparatus. The plastic twist deformation eliminates the surface stress difference on the steel monofilament and provides a strainght steel monofilament for belt ply reinforcement. This provides a simple solution with existing apparatus to manufacture straight steel monofilament suitable for tire reinforcement with high speed for mass production.

A pneumatic tire includes a resonator attached to the inner periphery of the tire, the resonator including a tube with an opening, and a cavity connected to the tube. The pneumatic tire further includes s a tread portion and each resonator faces the tread portion, the tread portion includes at least one circumferential longitudinal groove, and the opening is provided to penetrate a circumferential longitudinal groove of the tread portion.

Provided is a pneumatic tire having sufficient sealing performance. The present invention relates to a pneumatic tire including a sealant layer located radially inside an innerliner, the sealant layer being formed by applying a sealant to the inner periphery of a tire from which mold release agents have been removed.

A pneumatic tire includes cross belts and one or more protective belts provided in the tire radial direction. A width of a widest protective belt is greater than a width of any of the cross belts. In the tire profile, a maximum projection position of the widest protective belt is A, an end position of the widest protective belt is B, a position at which a straight line a passing through position A extending in the direction normal to a tread surface intersects with the tread surface is A′, and a position at which a straight line b passing through position B extending in the direction normal to the tread surface intersects with the tread surface is B′. An angle formed between a first straight line that links position A and position B and a second straight line that links position A′ and position B′ is from 0° to 15°.