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.
Calculate the belt pull for Roots Universal RAI with the following equation:
Calculate the Shaft Load with the following equation:
| URAI Frame | Dimension “A” | Max Allowable Shaft Load (lb.-in.) |
|---|---|---|
| 22,24 | 0.61 | 150 |
| 32,33,36 | 0.8 | 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 |
