How to design a Belt Drive Power transmission Mechanism

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There is a certain design criteria and standards on which the selections of the belt derive is done. 

Following is the four point criteria in which selection of belt depends IS: 2494-2017 

1. Belt velocity

2. Belt contact arc

3. Belt tension

4. Belt working conditions

Belt Velocity of Belt Drive

Velocity with which belt moves, has a great effect on its selection because when belts moves over pulley it bears wear and tear. 

So greater the velocity with belts moves over the pulley, grater will be the wear and tear. 

Along with this there is certain some certain limit of velocity up to which belt can transfer power effectively and after the system does not work effectively.

Belt Contact Arc with Pulley

Belt contact arm with the smaller pulley has great influence on its selection because more the contact arc of the belt more of its area will face friction effects. 

Greater the contact arc of belt more effectively it can transmit power from one pulley to another

Belt Tension in Drive Mechanism

Tension in belt produce stresses in belts and stress produce in belts directly influence the belt life. 

So greater the tension in belt more will be stresses and less will be the life of the belt. 

Working Condition of Belt Drive Mechanism

Belt working condition means the atmosphere in which the belts operated. 

Temperature and humidity or moisture content is the main factor which influences belt selection. 

At elevated temperature the belt show some elongation due to which its grip on pulley decrease and a result the effectiveness of the system decreases.

Standard Belt and Pulley Dimensions

According to the IS 2494-1974 following are the dimensions of the belt and pulley for V belts based on the power they needed to transfer.


Standard Dimension of Flat belt and Pulley
Standard Dimension of Flat belt and Pulley

Standard Dimension of V-belt and Pulley
Standard Dimension of V-belt and Pulley

Standard Dimension of V-belt Pulley
Standard Dimension of V-belt Pulley
Talha Atta is an automotive expert and one of the finest technical content writers from Pakistan. Talha owns WheelWisely.com and is Chief Editor at AutoGlobes.com. He has covered extremely granular content about structures, manufacturing process, automotive, materials and renewable energy. Connect with him on Upwork or check out more of his work on LinkedIn.

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