7.B] What are the different types of belt drives? With a neat sketch explain any two of them
Answer:-
Types of Belt Drives
- Open belt drive.
- Crossed or twist belt drive.
- Stepped or cone pulley drive.
- Belt drive with idler pulleys.
- Fast and loose pulley drive.
Stepped or cone pulley drive.
- A stepped or cone pulley drive, as shown in Figure, is used for changing the speed of the driven shaft while the main or driving shaft runs at a constant speed.
- This is accomplished by shifting the belt from one part of the steps to the other.
Belt drive with idler pulleys.
- A belt drive with an idler pulley, as shown in Figure, is used with shafts arranged parallel and when an open belt drive cannot be used due to the small angle of contact on the smaller pulley.
- This type of drive is provided to obtain a high velocity ratio and when the required belt tension cannot be obtained by other means.