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ROTEX® SP ZS-DKM-C non-sparking, double-cardanic coupling

Fail-safe and maintenance-free jaw coupling for potentially explosive atmospheres

The double-cardanic, non-sparking jaw coupling ROTEX® SP ZS-DKM-C is a special elastomer coupling for potentially explosive atmospheres (ATEX coupling). The double-cardanic, fail-safe ROTEX coupling type SP ZS-DKM-C can be applied maintenance-free in potentially explosive atmospheres.Compensating for large shaft displacements by the double-cardanic structure

They can be operated further in case if the elastomer spider wears off. This is made possible by a conductive nylon material preventing any static charge. At the same time this nylon material is highly resistant enabling it to continue to transmit the torque even in case of total wear of the elastomer spider. The double-cardanic elastomer coupling is characterized by completely non-sparking operation.

Jaw coupling complying with ATEX:

Assessed and approved for potentially explosive atmospheres acc. to EU directive 2014/34/EU (type 7.6 marked from stock, type 7.5 half shell clamping hub without feather keyway acc. to category 3)

  • Cam geometry is made up of conductive and high-strength nylon
  • Maintenance-free in potentially explosive atmospheres
  • Material of base body of hub: steel, aluminium or other metal materials
  • Standard drop-out center design elements up to a shaft distance dimension of 250 mm
  • Assembly/disassembly via four screws only
  • Low restoring forces, thus increased overall service life of all adjacent components (bearings, gaskets, etc.)
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ROTEX® torsionally flexible jaw couplings are elastomer couplings characterized by a compact design.
In spite of low weights and mass moments of inertia of the elastomer couplings they are able to transmit high torques. The compact shaft couplings are characterized by a long service life and sound operating characteristics generated by allover machining.

Thanks to the elastomer (elastomer spider) between the coupling hubs of the jaw couplings shocks respectively torsional vibrations in the drive train are damped. The high temperature-resistant spider material T-PUR® (elastomer) is available in various degrees of hardness. The torsionally flexible ROTEX couplings are used in almost every range of general machinery and plant engineering.

Overview: torsionally flexible shaft couplings / elastomer couplings

Properties of torsionally flexible jaw couplings:

ROTEX shaft couplings consist of two hubs (aluminium or steel) and a spider (elastomer ring / cam ring) made of T-PUR. The different degrees of hardness of the T-PUR-spider allow to adjust the level of damping and torsional stiffness of the elastomer coupling.

ROTEX couplings require few mounting space and thus enable easy assembly/disassembly. The numerous types provide for maximum flexibility and meet with the different mounting requirements through various types of hubs.

Function of torsionally flexible jaw couplings:

Jaw couplings ensure torsional vibration-damping power transmission and absorb shocks generated by machines with irregular operation.
In contrast to flexible couplings the connecting elements of which are subjected to bending and therefore to earlier wear, the flexible teeth of ROTEX® couplings (elastomers) are subjected to compressive stress only. The benefit of the elastomer coupling thus is to resist significantly higher loads.

The elastomers become deformed with load and high speeds. Sufficient expansion space must be provided.

All sizes of ROTEX® elastomer couplings have a maximum torsion angle of 5°. They can be mounted both horizontally and vertically.

Material of torsionally flexible jaw couplings:

Our elastomer material T-PUR is resistant to higher temperatures and has a considerably longer service life than common polyurethanes. From a visual point of view we marked the T-Pur material by the colours orange (92 Shore A), purple (98 Shore A) and light green (64 Shore D).

The previous polyurethane spiders in the colours yellow, red and natural white with green marking of teeth continue to be available on request.

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