Vbelt
drive 


Transmitting power P 
kW 
Rotational speed driver pulley n_{1} 
rpm 
Diameter driver pulley D_{1} 
mm 
Diameter driven pulley D_{2} 
mm 
Center to center distance 
mm 
Pulley
groove angle β 
deg 
Coefficient of friction μ 
 

Drive ratio i = D_{1}/D_{2} 
 
Rotational speed driven pulley i_{1} n_{1} 
rpm 
Belt speed v = π D_{1} n_{1} 
m/s 
Belt length L 
m 
Smallest belt wrap angle α 
deg 
Drive torque P/(2π·n_{1}) 
Nm 
Drive force T_{1}T_{2 }= P/v 
N 
Effective friction coefficient μ' = μ/(sin(β/2)) 
 
Ratio of belt forces T_{1}/T_{2 }= exp(μ'α) 
 
Belt tension load T_{1 }= (T_{1}T_{2})/(1T_{2}/T_{1}) 
N 
Belt tension load T_{2 }= T_{1} T_{2}/T_{1} 
N 
Shaft load F_{a} 
N 

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