Belt Design Guide, Equations, and Information

Belt Tensions, Pretensions, Torques, Power and Configurations

Description Equation Definitions
Torque transmitted by a belt

P = tension in belt (1-tight, 2-slack)
T = Torque (in-lb)
w = rpm
f = coefficient of friction (leather = 0.3, rubber = 0.25 Flat belt (use .5123 for V-belts)
B = 1/2 groove angle
C = distance between shafts (in.)
D1 = sheave diameter
D2 = sheave diameter
L = Length
m' = mass/unit length of belt
= Angle of contact

Rated power of belt
Tension of flat belt
Tension of V-belt
Belt length (open)
Belt length (closed)
• Angle of contact
Note:
• Use (+) for large pulley and X-belts
• Use (-) small pulley

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