SB--7--627 Page 5
FIGURE 4 -- BELT DRIVE OVERHUNG LOAD CALCULATIONS
Dimensions
Maximum
Gear
(Inches)
Allowable
Diameter
Moment
(Inches)
A
B
C
(Max)
(LB--IN)
Kg M
10
11.50
3.50
.75
16065
185,1
12
12.81
3.81
.75
25789
297,1
14
14.19
4.19
.75
38824
447,3
16
15.38
4.38
.75
65280
752,1
18
17.00
5.00
.75
91975
1059,7
20
18.75
5.25
.75
118673
1367,2
22
20.19
5.19
.75
137269
1581,5
Z
Ac
Z
Ac
Z
Ac
Z
Ac
Z
Ac
Z
Ac
0.000 1.000
0.250 0.966
0.500 0.926
0.750 0.879
1.000 0.823
1.250 0.751
0.025 0.997
0.275 0.962
0.525 0.922
0.775 0.874
1.025 0.816
1.275 0.742
0.050 0.994
0.300 0.958
0.550 0.917
0.800 0.869
1.050 0.810
1.300 0.734
0.075 0.990
0.325 0.954
0.575 0.913
0.825 0.864
1.075 0.803
1.325 0.725
0.100 0.987
0.350 0.951
0.600 0.908
0.850 0.858
1.100 0.796
1.350 0.716
0.125 0.983
0.375 0.947
0.625 0.904
0.875 0.852
1.125 0.789
1.375 0.706
0.150 0.980
0.400 0.943
0.650 0.899
0.900 0.847
1.150 0.782
1.400 0.697
0.175 0.977
0.425 0.939
0.675 0.894
0.925 0.841
1.175 0.774
1.425 0.687
0.200 0.973
0.450 0.935
0.700 0.889
0.950 0.835
1.200 0.767
0.225 0.969
0.475 0.930
0.725 0.884
0.975 0.829
1.225 0.759
2.5 -- Ac
125954 x Hp x S.F.
Ac
D x RPM
Key:
Ac
=
Arc of Contact Factor (Refer to Arc of Contact Factors Chart above)
Hp
=
Blower Horsepower for Operating Conditions
S.F.
=
Actual Drive Service Factor
D
=
Blower Sheave Pitch Diameter in Inches
RPM =
Blower Sheave Speed
Z
=
Large Sheave Pitch Diameter (in) -- Small Sheave Pitch Diameter (in)
Sheave Center Distance (in)
[
] [
]
Belt Pull
=
Shaft Moment (LB--IN) = Belt Pull x
B + C +
[
(
)
]
Sheave Width
2
CALCULATION OF BELT PULL
CALCULATION OF SHAFT MOMENT
DRIVE SHAFT ILLUSTRATION
MAXIMUM ALLOWABLE MOMENT
ARC OF CONTACT FACTORS
