DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS | Page 100 of 124 |
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Selection Guide
Compression
•Parallel Arrangement
The driving shaft can be connected to all of the bush- ings, and the driven shaft connected to the coupling fl ange. This arrangement loads all bushings in parallel and produces maximum torque capacity and a less resilient coupling.
•Series Arrangement
This arrangement requires an even number of bush- ings per fl ange. Mating fl anges of the driving and driven shafts are attached to alternate bushings. This arrangement transmits the torque through the bush- ings in an N x N series arrangement, thereby making the torque capacity
When high torque and small space are the control- ling factors, the parallel arrangement is recommended. When misalignment is the controlling factor, the bushings should be applied in series arrangement.
Table 1 provides selection criteria for parallel arrange- ment, Table 2 provides data for the series arrangement. Bushing selection is dependent upon torque require- ments, angular, parallel and axial misalignments, as well as bolt circle diameter, number of bushings and bushing size. The torque values shown on the charts are nominal. The bushings are capable of withstanding higher torques due to the shock loads or other short duration surges.
Torsional Flexibility
Example
Required torque capacity – 3400
Misalignment – Angular – 1.75°
Axial – 1/8 in
Parallel – 1/32 in
Proposed Coupling – 7 x 7 Series,
Torsional Spring Rate, Kθ = N R2 KR 2
Kθ = 7 (4)2 4000 = 224,000
Caution: Shaft length must be considered for potential whirl problems.
Recommended Misalignment Limits
| Misalignment | Bushing Arrangement | ||
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| Parellel | Series | ||
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| Angular | 1° | 1.75° | |
Single |
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Parallel | 1/64 in | 1/32 in | ||
Coupling | ||||
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| Axial | ±1/16 in | ±1/8 in | |
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| Angular | 2° | 3.5° | |
Double |
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Parallel | 3/16 to 1/2 in* | 3/8 to 1 in* | ||
Coupling | ||||
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Axial | ±1/8 in | ±1/4 in | ||
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* Dependent on shaft length (10 to 30 in).
Figure 1 – Parallel Arrangement | Figure 2 – Series Arrangement |
A part’s listing in this catalog does not guarantee its availability. |
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To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. | Rev.1 10/08 |