Overhung Load for Roots Positive Displacement Blowers

Proper V-Drive selection is essential to achieve maximum life for your blower and vacuum pump. Improper sizing or installation of a v-belt drive can shorten the life of the blower or even cause failure. Roots has provided a means to calculate the overhung load on the drive bearing and provide operational limits to these loads.

Use the following equations and table to verify that the v-belt drive on your blower does not exceed operating limitations.
Overhung Load Sketch

Calculate the belt pull for Roots Universal RAI with the following equation:

URAI Belt Pull Calculation


Calculate the Shaft Load with the following equation:

Shaft Load

URAI

Frame

Dimension "A"

Max Allowable Shaft Load

(lb.-in.)

22,24
0.61
150
32,33,36
0.80
400
42,45,47
1.02
650
53,56,59
1.13
1325
65,68,615
1.36
2250
76,711,718
1.16
2300


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