Patent ID: 6405774
Filing Date: 2002-06-18
Classification: B60C,D07B,Y10S

Abstract:
A rubber reinforcing steel cord comprising a steel cord of a bundle-twisted+layer-twisted structure obtained by arranging 9 steel filaments around 3 steel filaments, the 3 steel filaments each being two-dimensionally waved in the lengthwise direction, intertwining all of these steel filaments in one operation to form a bundle-twisted cord, and further arranging 14 steel filaments around the bundle-twisted cord followed by intertwining, wherein when the diameter of the two-dimensionally waved steel filament is d, the wave-form height thereof is h, and the wave form pitch thereof is P, the parameter F, defined by (hâˆ’d)/P is in the relation of 0.001&lE;F&lE;0.03 and further, the ratio b/a of the long diameter a and the short diameter b of the circumscribed circle of the cross section of the bundle-twisted cord is 0.94&lE;b/a&lE;1.00, and the ratio bâ€²/aâ€² of the long diameter aâ€² and the short diameter bâ€² of the circumscribed circle of the cross section of the steel cord is 0.96&lE;bâ€²/aâ€²&lE;1.00.