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HF-7-604 Page 17
On the direct connected units, alignment and lubrication of couplings to specifications of the coupling
manufacturer is very important. When mounted drives are supplied from the factory, proper alignment
has been established before shipment. However, during shipping, handling and installation, it is likely
that the alignment has been disturbed and final adjustment must be made before startup.
Exceeding overhung load limitations leads to unwarrantable premature bearing failure and shaft
breakage.
The location of the sheave on the blower shaft greatly affects the stress in the shaft. The optimum blower
sheave positioning is as close as possible to the blower drive cover, not to exceed dimension “C” in Drive
Shaft Illustration, (Figure 2- 5).
The calculated shaft moment must not exceed the maximum allowable moment listed in Maximum
Allowable Moment Chart, (Figure 2- 5). If the calculated shaft moment exceeds the maximum allowable
moment:
•
Increase Sheave Diameters to Reduce Belt Pull
•
Use Jackshaft Drive
•
Use Direct Coupled or Gearbox Drive
To calculate shaft moment for a given V-Belt Drive Arrangement:
1. Use the formula for Calculation of Belt Pull, (Figure 2- 5) to calculate belt pull.
2. Insert the calculated belt pull into the formula for Calculation of Shaft Moment,
(Figure 2- 5), to arrive at the calculated shaft moment.
Summary of Contents for HELIFLOW 8 Series
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