Patent ID: 6071206
Filing Date: 2000-06-06
Classification: F16H

Abstract:
A two speed pulley assembly for receiving a rotational input from a belt and for rotationally driving an input shaft of a device, said assembly comprising:a sheave having a belt engaging portion for receiving the rotational input from the belt, said pulley sheave also having a plurality of carrier arms cooperating to define a circle being coaxial with said outer portion;a plurality of rollers rotatably supported on said carrier arms, said rollers being cylindrical and having a smooth exterior surface;a braking member rotatably supported relative to said sheave, said braking member including a generally smooth circumferential surface defining a first raceway in contact with said exterior surface of said rollers;an output member rotatably supported relative to said sheave, said output member including a generally smooth circumferential portion defining a second raceway in contact with said exterior surface of said rollers, said second raceway being coaxial with said first raceway;a brake, said brake inhibiting rotation of said braking member when engaged and permitting rotation of said braking member when disengaged;a one-way clutch bearing mounted between said sheave and said output member, said clutch bearing preventing rotational speed of said sheave from being greater than rotational speed of said output member;whereby said sheave drives said output member through said rollers at a rotational rate greater than that of said sheave when said brake is engaged and said sheave drives said output member through said clutch bearing at a one to one ratio when said brake is disengaged.