# Introduction

The belts or ropes are used to transmit power from one shaft to another by means of pulley which rotate at the same speed or at different speeds .The amount of power transmitted depends upon the following factors ;
1. The velocity of the belt .
2. The tension under which the belt is placed on the pulleys .
3. The arc of contact between the belt and the smaller pulley .
4. The condition under which the belt is used .

## SELECTION OF A BELT DRIVE

Following are the various important factors upon which the selection of a belt drive depends .
1. Speed of the driving and driven shafts .
2. Speed reduction ratio .
3. Power to be transmitted .
4. Center distance between the shafts .
5. Positive drive requirement .
6. Shafts layout .
7. Space available and
8. Service conditions .

### TYPES OF BELT DRIVES

1. light drive
2. Medium drive
3. Heavy derive

#### TYPES OF BELT

1. Flat belt .
2. V-belt.
3. Circular belt or rope .