Differential Band Brake
Torque M = P/ω, ω=2πn/60
Nm
Drum radius r
10
-3
m
Wrap angle
α
deg.
Coefficient of friction μ
-
Lever ratio b
1
/b
2
-
Lever ratio b
2
/a
-
Brake force T
1
-T
2
= M/r
N
Ratio of belt forces T
1
/T
2
= exp(μα)
-
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
Bearing load F
a
N
Actuating force F
i
= (T
2
b
2
-T
1
b
1
)/a
N
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