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Sunco Blowers www.suncoblowers.com
Phone: 704-545-3922 Pg. 23
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Sunco Blowers
9.3.1. Direct coupled drive with flexible coupling
To directly couple the motor to the input shaft with a flexible coupling:
x
The drive and driven shafts must be accurately aligned and have a sufficient gap to
minimize axial and radial forces;
x
Maximum deviation in offset between drive and driven shaft centerline should not
exceed 0.005” TIR(total indicated run-out) referenced from both hubs; and
x
Maximum deviation from parallel off centerline or hub faces should not exceed
0.001” when checked at least four points around center.
9.3.2. V-belt drive
When using V-belts to connect the motor and rotary blower, consider the following:
x
Misalignment of the V-belt drive should not exceed
f
0.5° in both parallel and
perpendicular planes.
x
Use the largest sheave diameters permitted by speed rating to maximize power
transfer through the V-belt (This is opposite to economically driven belt drive
selection, resulting in small-underrated drives).
x
Use belt lengths that keep the center distance between shafts more than 24” and less
than 48”.
x
Larger center distances are used and favor longer belt life, however the tendency
for V-belts to vibrate at resonate frequencies require review.
x
Shorter distances mean less misalignment forgiveness, shorter V-belt life, and low
speed ratio selection (compact V-belt drives are common, but should be used on
low power, low ratio, drive system with higher service factor rating, above 1.5).
x
Check the tension of the V-belts and adjust, if necessary, when installing the unit.
x
Manual tension adjustment systems need the V-belts checked for tension 30
minutes and 24 hours after every adjustment. Tension should not drift below values
recommended by manufacture.
