A radial tyre having a carcass to which steel cord is applied

摘要

The present invention relates to a passenger car and light truck radial tyre in which a steel cord (1) is applied to the carcass. The steel cord (1) according to the present invention is a 1 x 3 steel cord which is formed by twisting three filaments (1a) together in a constant direction, wherein the surface of each filament (1a) consisting of carbon steel having a carbon content of 0.70∼0.96 weight% is plated with brass, the tensile strength of the filament (1a) prior to stranding into steel cord (1) is in the range of 260∼375kgf/mm2, and said cord (1) has relatively a small twist pitch to said filament diameter ratio, whereby the steel cord (1) has improved fatigue resistance and anti-flare properties. In addition, the radial tyre in which the said steel cord (1) is applied to the carcass can achieve the reduction of fuel consumption rate, improvement of handling property, enhancement of dimensional stability and improvement of tyre uniformity.