Pulleys

Pulley — friktsionnoyekoleso with rim or groove on circle which transfers the movement to drive belt or rope. It is used as one of the main of chasteyremyonny transfer, there are also pulleys on raspredvalakhmekhanichesky blocks.

Unlike the block, the pulley transfers effort from axis to belt (or from belt on axis); the block rotates on axis freely and provides only change of the direction of the movement of belt or rope.

The system from two pulleys fixed on axes between which there is ring belt is called the belt gear.