Drive belt pulley and belt drive system

摘要

A hollow cylindrical pulley body 5 is carried rotatably by a hollow cylindrical shaft member 11 . A support rod 8 is inserted in the shaft member 11 to support the shaft member 11 for rocking motion about a pivot axis C 2 orthogonal to the shaft member 11 . The pivot axis C 2 is inclined backward in the direction of belt travel with respect to the direction of load on the shaft member 11 . With this configuration, when the drive belt 3 deviates to one side, the pulley body 5 is immediately angularly moved so that it is inclined with a level difference with respect to the direction of load on the shaft member 11 and is positioned obliquely relative to the drive belt 3 , thereby producing a force of returning the drive belt 3 to its normal position.