Belt drives are
A) Friction drives
B) Positive drives
Can you guess from the image?
Belt drives are friction drives, as the power transmission is done through the friction between the pulley and belt. There are minor power losses during transmission due to slip. Positive drives have zero losses during transmission.
Drives are used to transmit the power at the speed of 10 m/s to 25 m/s with the help of pulleys of different diameters. Sometimes ropes also used instead of the belt.
More information on material for friction drives
Materials used for belts-
- For rubber belts, elastomeric friction cover is used with polyamide fabric and tension member to manufacture the belt. Binding agents are also introduced inside the belt materials to keep all the layers together.
- Leather belts are used commonly for flat belt drives and can be oak-tanned or mineral tanned. These belts are available in different layers like single layer, double layer or triple layer.
- Fabric belts are made out of cotton and folding it two to three times can give you desired thickness.
- Rubber belts are good but if exposed to the chemical or heat, they get easily destroyed.
- Standard belt thicknesses available are 6mm, 8mm, 10mm, 12mm and it will depend upon the manufacturer and the supplier.
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