Definition: When two or more gears are made to mesh with each other to transmit power from one shaft to another. Such a combination is called gear train
Purpose: The purpose of the train used is
To obtain correct & required velocity ratio between driver & driven shafts.
To decide upon the relative position of the axes of shafts.
To decide upon amount of power to be transmitted between shafts
Types: Following are the different types of gear trains, depending upon the arrangement of wheels :
Crank and slotted lever quick return motion mechanism:
Slip of the belt: A firm frictional grip between belt and shaft is essential. But sometimes it becomes insufficient. This may cause some forward motion of the belt without carrying the driven pulley with it. This called as slip of the belt. It is expressed as a percentage.
Effect on velocity ratio: Result of belt slipping is to reduce the velocity ratio of the system.