Lesson 23.


Flat belt drives may be of any of the following types:

1) Open belt drives

 In this type of arrangement the shafts are parallel to each other and rotate in the same direction as shown in the fig 5.2. The lower side belt also known as tight belt side has more tension than the upper side belt known as slack side. The driver pulls the belt from one side and delivers it to other side known as slack side.

L 23 fig.1

Fig 5.2 open belt drive

2) Crossed or twist belt drives

The arrangement of crossed belt drives is shown in the figure 5.3. Here the shafts are arranged in parallel. The belts rub against each other which cause wear and tear. There is driver pulley and driven pulley in the arrangement and they rotate in opposite direction.

L 23 fig.2

Fig 5.3 cross belt drive

3) Quarter turn belt drives

In this type of arrangement the shafts are arranged at right angles. The arrangement of the same is shown in the figure 5.4

L 23 fig.3

Fig 5.4 Quarter turn belt drive

4) Compound belt drives

Compound belt drives are used where power has to be transmitted through number of pulleys. The schematic diagram is as shown in the figure 5.5

L 23 fig.4

Fig 5.5 Compound belt drive

5) Stepped or cone belt drives:

Such belt drives are commonly used for changing the speed of driven shaft. The construction details for the same is shown in the figure 7.6

L 23 fig.5

Fig 5.6 stepped or cone belt drive


Last modified: Wednesday, 26 March 2014, 10:52 AM