Endless metal belt for metal belt type nonstep variable speed transmission

摘要

An endless metal belt (15) is formed by layering thin metal rings (30) in thicknesses to form tow layered ring structures (31) and fitting the two layered ring structures in slots (32a) formed in opposite side parts of each of metal blocks (32), extending on the opposite sides of a neck part (32e) of the metal block. The endless metal belt is extended between drive and driven pulleys (6, 11) respectively having variable effective diameters to change speed change ratio. Side edges of the inner and the outer circumference (30a, 30b) of the thin metal ring are rounded in round side edges of a radius RR of curvature, middle parts of opposite side surfaces (30c) of each thin metal ring are flat, front and rear edges of opposite side surfaces of the neck part of each metal block are rounded in round edges (32f) of a radius R0 of curvature, and the radius RR of curvature and the radius R0 of curvature are determined so that a stress relating to fatigue strength and induced in the inner circumference of the innermost thin metal ring (301) is equal to or lower than a stress relating to fatigue strength and induced in the inner side surface (30c) 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. IMAGE IMAGE