Sumitomo Electric Tochigi Co., Ltd.

Sumitomo Electric Industries, Limited

Sumitomo Rubber Industries Limited

Sumitomo (sei) Steel Wire Corp.

Kazuhiko Saito

Kenichi Okamoto

Yasuo Sakai

Shinei Takamura

Koji Fujisawa

Masumi Suzuki

Akifumi Matsuoka

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

A rubber product-reinforcing metallic cord is provided which comprises three to five metallic filaments, which shows a high degree of penetration of rubber without reducing compressive rigidity, and which can be manufactured at low facility and production costs. A rubber product-reinforcing metallic cordis formed by twisting together a pre-strandcomprising a first metallic filamentand a second metallic filamenthelically wrapped around the first filament, and a fifth metallic filament(or) with a twist pitch P. The metallic cordmay be formed by twisting together two of such pre-strands, or by twisting together two of such pre-strands and the fifth metallic filament.

Rubber product-reinforcing metallic cord and method for manufacturing such a cord

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Tochigi, Japan

Kazuhiko Saito