V-belt 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
)/(1-T
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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