| 摘要 |
A steel cord of 1+3 structure is formed by twisting three sheath steel filaments (2,3,4) around a single core steel filament (1). In this case, the three sheath steel filaments are arranged so as to satisfy conditions at a section of the sheath perpendicular to the longitudinal direction of the cord that a maximum angle ( alpha ) of a triangle formed by connecting central points (2a,3a,4a) of the sheath filaments to each other is not less than 90 DEG but less than 180 DEG and an apex defining the maximum angle is always located on the same filament (3) and a distance (L) between the central point (3a) of this filament and the central point (2a;4a) of the filament (2; 4) adjacent thereto is 1.0-1.3 times the diameter (ds) of the filament (2,3,4). <IMAGE> |
