Patent ID: 6517458
Filing Date: 2003-02-11
Classification: F16G

Abstract:
An endless metal belt for a metal belt type nonstep variable-speed transmission, extended between a drive pulley and a driven pulley included in the metal belt type nonstep variable-speed transmission, respective effective diameters of the drive and the driven pulley being variable to change speed change ratio, said endless metal belt comprising:thin metal rings layered in thicknesses to form two layered ring structures; and a plurality of metal blocks arranged along and supported on the two layered ring structures, wherein side edges of inner and the outer circumferences of each of the thin metal rings are rounded in round side edges of a radius RR of curvature, middle parts of opposite side surfaces of each thin metal ring are flat, front and rear edges of opposite side surfaces of a neck part of each metal block are rounded in round edges of a radius R0 of curvature, respectively, and the radius RR of curvature of the round side edges of the inner and the outer circumference of each thin metal ring and the radius R0 of curvature of the front and the rear round edge of the opposite side surfaces of the neck part of each metal block are determined so that a stress relating to fatigue strength and induced in the inner circumference of the innermost thin metal ring is equal to or lower than a stress relating to fatigue strength and induced in the inner side surface of the thin metal ring by the front and the rear edges of the side surface of the neck part of the metal block that come into contact with the thin metal ring.