Belt Drives
Chain Drives
Gears
μ=F/G
T
e
=T
1
-T
2
T
1
:tight T
2
:slack
P
b
=
Bb
2 tan
∗
α
/
2
P
b
=Pitch diameter variation
B
b
=belt top thickness
H
b
=belt thickness
α=sheave groove angle
V=rw
=
radius
2
π n
60
n=rpm of pulley
Design HP=rated HP X service factor
Corrected HP=HP per belt X “F” factor X
number of belts
Actual speed ratio=
rpm
1
rpm
2
=
D
2
D
1
(observation)
Theoretical speed ratio=
D
2
D
1
=
r
2
r
1
D=diameter
Overall TSR=TSR
1
x TSR
2
x TSR
n
Input HP=
Torque x RPM
63000
lb-in
HP=
Torque x RPM
5252
lb-ft
Torque=
63025
x HP
N
in-lb
Torque Ratio=
T
2
T
1
=
N
1
N
2
(inverse
of speed ratio)
Overall ASR= D
first
/D
last
Theoretical velocity ratio=
¿
of teet hdriven
¿
of teet hdriver
Actual velocity ratio=
Driver speed
drivenspeed
L=2C +
N
+
n
2
+
(
N
−
n
)
2
4
πC
C=
L
−
N
+
n
2
+
√ L
−
(
N
+
n
)
2
2
−
8
(
N
−
n
)
2
4
π
2
4
L=length of chain in pitches
C=center distance in pitches
N=number of teeth in large sprocket
n=number of teeth in small sprocket
Design HP= HP x SF
L= # of links x pitch
Mechanical Advantages:

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- Spring '19
- gear, pitch diameter, Torque x RPM , Exam 2