Coupling extends service life of entire drive system
Siemens is extending its coupling portfolio to include a new elastic claw coupling, the Flender N-Bipex, with hubs identical in construction. It will be available in ten sizes made of high-quality nodular cast iron.
An optimised cam geometry and newly developed elastomers have meant a major improvement to the service life of the N-Bipex in comparison to standard couplings available in the marketplace. Depending on the size, Siemens says torque has been increased by between ten and 20% over previous solutions.
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. Flender N-Bipex couplings are used predominantly in connection with hydraulic systems and geared motors.
The casting method of the coupling hubs 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.
Siemens says the degree of resilience to forced rupture and the maximum admissible speeds achievable with nodular cast iron couplings are superior to those of grey cast iron couplings, and are comparable to 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 wide temperature range without restriction.
Siemens plc (Drives Div)
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