Patent ID: 6129643
Filing Date: 2000-10-10
Classification: F16H

Abstract:
A pulley with a variable effective radius with respect to a belt stretched therearound, the pulley comprising:a rotation shaft;a pair of annular pulley main bodies fitted around said rotation shaft for rotating with the shaft about an axis in a predetermined rotation direction, said main bodies having respective opposing tapered torque transmission faces, and defining, therebetween a retention groove for holding the belt;first coupling means coupling the pair of pulley main bodies to each other in a co-rotatable manner while permitting the pair of pulley main bodies to synchronously move relative to each other in an axial direction;biasing means biasing the pair of pulley main bodies toward each other; anda pair of second coupling means coupling the pair of pulley main bodies to the shaft for torque transmission thereto,the pair of second coupling means including a pair of conversion mechanisms converting rotational movements of the corresponding pulley main bodies relative to the shaft into axial movements of the corresponding pulley main bodies so as to move the pair of pulley main bodies synchronously toward each other by equal stroke amounts in cooperation with the first coupling means.