ROTARY TRANSMISSION

Rotary transmission systems put two rotating elements into contact. These mechanisms have two purposes:
-Transferring rotary force from an input location to another location.
-Changing the rotary speed by using rotating elements of different sizes.

1.Changes in speed

-Increasing speed system:

                                       Driver pulley

                                                          ↓   

-Constant speed system:



-Decreasing speed system:

                                                                                                 Driver pulley

                                                                                                          ↓



2.Speed ratios

The relationship betweenthe speeds of the two wheels is inversly proportional to their sizes.

N2/N1=D1/D2