radial force on pulley 3

[taregan]

I am interested in determining the radial force on the contact surface of a pulley and a flat belt under static tension. Can't find anything in the handbooks. Appreciate any information available.

 

[electricpete]

If the pulley is truly static, then the radial force is twice the belt tension.

If the pulley is rotating under load, then calculate torque associated with load (T = 5250*P/N where T in ft-lbf, P in hp, N in rpm) and convert torque to force based on pulley diameter, and multiply be a belt factor.


Here is a reference with belt factors for various configurations. You may find some lower numbers in other references (I know many people use 1.5 -2.0 for Vee belts)

http://www.nskf-bearings.com/bearin...e/Belt_or_Chain_Transmission_Applications.htm

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[electricpete]

convert torque to force based on pulley diameter

Maybe that was misleading. Let me try again:

convert torque to force based on pulley radius

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[taregan]

Thanks electricpete...to clarify, I meant the belt force was constant but the pulley is in motion. You got me covered.

 

[hydtools]

This may be helpful:

http://www.roymech.co.uk/Useful_Tables/Drive/Flat_belts.html

Ted