Steel code and radial tire null for rubber additional strength

摘要

PROBLEM TO BE SOLVED: To obtain an inexpensive steel cord for reinforcing a rubber, simple in structure but having a moderate elongation characteristic and good rubber permeability and fatigue resistance. SOLUTION: The improvements of a steel cord of 1+n structure comprising a core element wire and five or more side element wires 2 stranded around the core element wire comprises that the core element wire comprises a flat wire 1 having continuous waves in the longitudinal direction, that the core has an approximately unidirectional flat shape in the longitudinal direction, that spaces are formed between the flat wire 1 and the side element wires 2 due to the continuous waves of the flat wire 1, and that spaces 3 having distances of =0.04mm are formed at least two places between adjacent side element wires 2 in the cross section rectangular to the longitudinal direction of the cord.