文档介绍：POWER TRANSMISSION
The following are the major types of power transmission.
1 Belt drive, 2 Rope drive, 3 Chain drive, 4 Gear drive
BELT DRIVE: - This type of drive is used when the power is to be transmitted from one shaft to other which is at a distance. Pulleys are mounted on the driver and driven/follower shafts and an endless belt are fitted tightly over these pulleys. The frictional resistance between these pulleys and belt is the reason for the power transmission, which depends on the velocity of belt, tension of the belt and arc of contact of the belt in the smaller pulley. There are flat belt and V- belt used for the power transmission.
Open belt drive: - for parallel shafts and to be rotated in the same direction as that of the driver shaft. The driver pulley pulls the belt from one side and delivers it to the other side. The tension in the former side will be larger and hence called tight side and the other side where the tension is less is called slack side.
Crossed belt drive: - when the driven shaft is to be rotated in the opposite direction as that of the driver shaft, the belt is to be arranged in a crossed manner as shown in the fig.
ROPE DRIVE: - cotton ropes of circular in cross section are used for power transmission. They are arranged in groves of the pulley. The grove angle varies from 400 to 600 . More than one drive can be taken is the main advanta