Power Transmission By Belts:

In this section, we will discuss how power is transmitted through a belt drive. The belts are utilized to transmit very small power to the high amount of power. In some of the cases magnitude of the power is negligible however the transmission of speed just may be significant. In such cases the axes of the two shafts might not be parallel. In some of the cases to enhance the angle of lap on the smaller pulley, the idler pulley is utilized. The angle of lap might be defined like the angle of contact among the belt & the pulley. Having the increase in angle of lap, the belt drive may transmit more power. Along with the enhance in angle of lap, the idler pulley also does not permit reduction in the initial tension in the belt. The utilization of idler pulley is illustrated in Figure.

 Use of Idler in Belt Drive