0 = Least Favorable, 1 = Less Favorable, 2
= Favorable, 3 = More Favorable, 4 = Most Favorable
|
FEATURE |
|
Grid |
|
Gear |
|
Disc |
Elastomer |
Remarks |
|
Torque Range |
|
3 |
|
4 |
|
2 |
|
1 |
|
Gear packs a lot of punch in a small package while elastomer couplings get prohibitively expensive in large sizes.
|
|
Bore Range |
|
3 |
|
4 |
|
2 |
|
1 |
|
An indication of the breadth of the
line.
|
|
Speed Capability |
|
2 |
|
3 |
|
4 |
|
2 |
|
Because of closely machined and fitted components, disc and gear couplings have little inherent vibration.
|
|
Misalignment Capacity |
|
2 |
|
3 |
|
3 |
|
4 |
|
Grid coupling is rated for 1/4°, gear
and disc about 3/4°, and elastomer is still higher.
|
|
Temperature Range |
|
3 |
|
2 |
|
4 |
|
1 |
|
Elastomer coupling is limited to 200°F (95°C), while a disc coupling can
handle 450°F (232°C).
|
|
Torsionally Flexible |
|
2 |
|
0 |
|
0 |
|
4 |
|
Allows wind-up to dampen shock loads and vibration. |
|
Torsionally Rigid |
|
1 |
|
3 |
|
4 |
|
0 |
|
Disc couplings allow for exact synchronization of equipment and can raise natural frequencies. Gear
couplings have backlash.
|
|
Ease of Installation |
|
4 |
|
1 |
|
2 |
|
4 |
|
Includes types of fits typically
utilized, number of components, lubrication and alignment.
|
|
Ease of Service |
|
4 |
|
0 |
|
3 |
|
4 |
|
Degree of difficulty in disassembly and replacement of wearing component.
|
|
Minimum Maintenance |
|
3 |
|
0 |
|
4 |
|
4 |
|
Frequency of routine service, parts replacement and relubrication.
|
|
Lifetime Operating Costs |
|
3 |
|
1 |
|
4 |
|
3 |
|
Considers initial price and labor,
spare part cost and labor plus frequency of routine maintenance.
|
|
Life Expectancy |
|
3 |
|
1 |
|
4 |
|
2 |
|
A measure of durability and rugged performance over the long haul.
|
|
General Availability |
|
4 |
|
3 |
|
2 |
|
4 |
|
General marketplace availability
through distribution channels and speed of response.
|
|
Minimum Radial Loads |
|
2 |
|
1 |
|
4 |
|
3 |
|
Forces exerted on bearings due to misalignment.
|
|
Minimum Bending Moment |
|
2 |
|
2 |
|
4 |
|
3 |
|
Forces exerted on bearings due to misalignment.
|
|
Generated Axial Forces |
|
2 |
|
4 |
|
4 |
|
2 |
|
Forces produced by the coupling which act on connected shaft bearings.
|
|
Transmitted Axial Forces |
|
1 |
|
1 |
|
4 |
|
1 |
|
Force transmitted through the coupling.
|
