Transmission Products: Couplings

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Selection of flexible couplings is based on the following parameters:

1.    

Misalignment
Where misalignment is high, a highly elastic design such as Optiflex tyre is preferable to medium elasticity designs. Low elasticity couplings should never be combined with high misalignment. Operational life of couplings and associated machinery is reduced as misalignment increases; hence, the most accurate alignment possible is desirable (particularly as speeds increase).

2.

Machine Mounting
Flexible mountings or supporting structures with low rigidity also require a highly elastic coupling such as the Optiflex Tyre design.

3.

Shock
Where shock or vibration is high, a highly elastic design such as Optiflex is preferable to medium elasticity designs. The higher cost of Optiflex relative to medium elasticity designs will generally be repaid many times over by the extended service life of machinery.

4.

Size
Generally, TRC and Jaw couplings are physically smaller than highly elastic couplings of a similar power rating.

5.

Cost
TRC, MC and Jaw couplings offer the best cost/performance scenario for drives requiring midrange-shock, vibration and misalignment capacity.

6.

Maintenance
Flexible elements on MC, Optiflex and Jaw (wrap type) couplings can be easily replaced without disturbing the coupling, driving or driven machines. This can significantly reduce maintenance costs.

7.

Positive Vs Non-Positive Drive
In the event of tyre failure on the Optiflex Tyre coupling there is no connection between the drive and driven shaft. TRC, Jaw and MC couplings will continue to drive for a period of time after element failure. Optiflex can be used as a shear-pin but never in a situation where the drive should always be maintained. Conversely, TRC, Jaw and MC couplings offer better safety.

8.

Environment
All couplings in this publication will withstand typically encountered environments. For highly corrosive or high temperature applications, first consult Transeals for compatible elements and designs.

9.

Lubrication
Chain couplings require regular lubrication.

10.

TaperFix Bush Vs Parallel Bore
For the same sized coupling, TaperFix designs are often easier to install than parallel bore designs however parallel bore designs usually accommodate larger bore sizes than the equivalent sized TaperFix coupling.

With TaperFix couplings it is often necessary to select a larger size coupling than required (due to power ratings) to accommodate the shafts where a smaller parallel bore coupling can often be selected on power ratings alone.

Additionally TaperFix designs are harder to axially align than parallel bore designs. TaperFix H flanges require end wrench clearance which is not required by parallel bore designs. Where space and fitting issues do not preclude TaperFix bushes, their advantages far outweigh their disadvantages.

For more information Click Here to view our Couplings catalogue.