Machine Design (Belt Drive) 3

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

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