Machine Design
Belt Drive
Belt Drive :
- For Open Belt
- For Closed Belt
α = Angle of wrap for belt (radians)
P1 = Belt tension in the tight side
P2 = Belt tension in the loose side (N)
m = Mass of the one meter length of belt (kg/m)
v = Belt velocity (m/s)
f = Coefficient of friction
- Power Transmitted = (P1 - P2) Velocity
- Condition for maximum power
- The maximum permissible tension in the belt should be three times the tension due to centrifugal force (Pmax = 3Pc)
- Alternatively, the tension in the tight side of the belt should be twice the tension due to centrifugal force (P1 = 2Pc)
Reason Of Power Loss In Belt Drive:
- Power loss due to belt creep on the pulley.
- Power loss due to internal friction between the particles of the belt in alternate bending and unbending over the pulley.
- power loss due aerodynamic resistance to the motion of pulleys and belt.
- power loss due to friction in bearing of pulleys
page no.3
- The maximum permissible tension in the belt should be three times the tension due to centrifugal force (Pmax = 3Pc)
- Alternatively, the tension in the tight side of the belt should be twice the tension due to centrifugal force (P1 = 2Pc)
Reason Of Power Loss In Belt Drive:
- Power loss due to belt creep on the pulley.
- Power loss due to internal friction between the particles of the belt in alternate bending and unbending over the pulley.
- power loss due aerodynamic resistance to the motion of pulleys and belt.
- power loss due to friction in bearing of pulleys
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