Open multi-strand wire rope

Abstract

A steel cord (10) adapted for the reinforcement of rubber products, comprises a core strand (12) and six peripheral strands (14) concentrically surrounding the core strand (12). Each of the core and peripheral strands (12, 14) comprises a centre of two or more centre filaments (16) and two layers of filaments surrounding the centre. The core strand (12) has a diameter D1 which is greater than the diameter D2 of the peripheral strands (14). All the filaments (18, 20) of each layer have substantially the same diameter and a radially outer layer has a twist angle which is greater than a twist angle of a radially inner layer of the same strand. Each of the strands (12, 14) in the cord is composed of no more than twenty-six filaments (16, 18, 20) being twisted together.

Description

technical field

[0001] The present invention relates to multi-strand steel cords for reinforcing rubber products such as rubber crawlers and heavy tires for construction machinery and large excavator applications. Background technique

[0002] Pneumatic tires for large heavy machinery used in heavy construction and earth moving operations have much higher operating loads and inflation pressures than typical trucks and light vehicles. Therefore, radial tires for large excavators require special reinforced wire ropes.

[0003] Since a steel cord for reinforcing a tire is required to have a high breaking load and high fatigue resistance, a steel cord having a multi-strand structure is generally widely used. Multi-strand construction has multiple strands, each strand consisting of multiple wires twisted together. These strands are twisted together to form a wire rope. For example, steel wire ropes are known, for example with a 7×(3+9+15)+1 structure. However, the structure 7...

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