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Coupling extends service life of entire drive system

25 April 2015

Siemens is extending its couplings portfolio to include a new elastic claw coupling, the Flender N-Bipex, which will be available in ten sizes made of high-quality nodular cast iron.

An optimized cam geometry and newly developed elastomers have meant a major improvement to the service life of the N-Bipex. Depending on the size, torque has been increased by between ten and 20 percent over previous versions.

The new elastomers are available in three different shore hardnesses, and allow the couplings to be used across a temperature range of -50° C to +100 °C without compromising nominal torque. 

The casting method used increases the degree of freedom for shaping the cams. This added scope enables the contour to be designed to ensure optimum engagement of the load flank surfaces. The decisive factor here is that the adjacent cam ring made of high-grade polyurethane has the facility for sufficient load-dependent deformation, while remaining in its designated position under all conditions.

This results in a marked reduction in wear coupled with increased performance. The degree of resilience to forced rupture and the maximum admissible speeds achievable with nodular cast iron couplings are far superior to those of grey cast iron couplings, and are comparable with their steel counterparts.

The newly developed elastomers used for the Flender N-Bipex are designed for high performance. They are capable of withstanding dynamic loads across a very wide temperature range without restriction. The material used offers excellent compressive strength, wear resistance, dimensional stability and ductility.


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