Sumitomo Rubber Industries Limited

Sumitomo Electric Industries, Limited

Sumitomo Electric Tochigi Co., Ltd.

Nippon Steel Corporation

Nagase Chemtex Corporation

Masumi Suzuki

Takashi Miki

Hiromu Izumida

Junichi Kodama

Hirotaka Ishizuka

Shinei Takamura

Koji Fujisawa

Tetsuya Nakajima

Tetsuya Hosomi

Shuichi Yamamori

Momoka Misaki

Dong Miao

Shingo Ishida

Natsuki Maekawa

Noboru Okabe

Takashi Tokuyama

Kenichi Yamashita

Kazuhiko Saito

Masato Fushiki

Yogun Kida

Akifumi Matsuoka

Yuta Miseki

Toyohiro Nagano

Hiroyuki Fujioka

Takuya Kurihara

A plurality of belt layersare superimposed in a radial direction. The belt layersinclude a plurality of steel cordsarranged in parallel in a row and rubber. The steel cordshave a 1&#xd7;4 structure in which four filamentsare twisted, and when a center-to-center distance between the steel cordsin at least two of the belt layersadjacent in the radial direction is T, and an average diameter of virtual circumscribed circles of the steel cordshaving the 1&#xd7;4 structure is D, 1.25&#x2264;T/D&#x2264;2.25.

Tire with specified belt layers of 1X4 steel cords

There is provided a steel cord including a steel wire and a plating layer that covers the steel wire and has Cu, Zn, and Co, wherein Cu and Zn are alloyed and a region covered with Co and a region not covered with Co are mixed on the outermost surface of the plating layer.

Steel cord and method for producing the same

A tire having a rubber body in which a steel cord is embedded, wherein a layer composed of ZnCoO is formed at the interface between the steel cord and the rubber body and x+y is 5/6 or more and 1 or less.

Tire

In a forming method for forming an assembly of a bead core and an apex rubber, there is used a rotating body which comprises a rotating base substance having an assembly forming surface, and a core receiving portion projecting from the rotating base substance in the axially outward direction of the rotating base substance. The core receiving portion projecting has a receiving surface supporting the radially inner peripheral surface of the bead core. The apex rubber is formed by winding an unvulcanized rubber strip along the assembly forming surface from a starting position constituted by the radially outer peripheral surface of the bead core supported on the receiving surface so as to laminate in a tapered cross sectional shape.

Forming method for assembly of bead core and apex rubber

A tire () includes a belt () provided on a carcass () and a band () for covering the belt (). The band () includes a full band () and a pair of edge bands () provided in the vicinity of a shoulder and positioned on an outside in a radial direction of the full band (). The full band () has a first band cord () wound spirally in a substantially circumferential direction. The edge band () has a second band cord () wound spirally in the substantially circumferential direction. A modulus of the second band cord () is higher than that of the first band cord (). In the tire (), it is preferable that an outer end () of the full band () should be provided on an outside of an outer end () of the belt () in an axial direction. An outer end () of the edge band () is identical to the outer end () of the belt () or is provided on an inside thereof.

Pneumatic tire

Growing community of inventors

Kobe, Japan

Masumi Suzuki