FLENDER Standard Couplings Flexible Couplings — RUPEX Series © Siemens AG 2015 General information ■ Overview Coupling suitable for use in potentially explosive atmospheres. Complies with the current ATEX Directive for: II 2 G T4 / T5 / T6 D120 °C -30 °C ≤ T a ≤ +80 °C / +50 °C / +40 °C I M2 RUPEX pin and bush couplings link machine shafts and com- pensate for shaft misalignment with weak restorative forces. The torque is conducted through elastomer buffers, so the cou- pling has typically flexible rubber properties. Thanks to their robust design, RUPEX couplings are also suit- able for rough operating conditions.
■ Benefits RUPEX couplings can also hold loads when overloaded and are therefore especially suitable for drives for special safety and re- liability requirements. RUPEX couplings are fitted by putting together the coupling halves. Fitting with low torsional backlash is simplified by the barrel-shaped geometry of the buffers. Torque shock loads and changing loads are no problem for robust, compact flexible RUPEX couplings. RUPEX couplings require little maintenance. Only the elastomer buffers, as wear parts, need be replaced and the coupled ma- chines need not be moved to do so. The steel variant is also especially suitable for high-speed drives.
8 RUPEX couplings are suitable for reversing operation and hori- zontal and vertical fitting or fitting at any required angle. ■ Application RUPEX couplings are available as a catalog standard in 26 sizes with a rated torque of between 200 Nm and 1300000 Nm. pling is particularly suitable for operation in rough conditions or heavy-duty drives with electric motor drive. Ventilator drives with high ventilator mass and drives in the cement industry are typi- cal applications. The coupling is suitable for use at ambient temperatures of be- tween -30 °C and +80 °C. By using alternative elastomer buf- fers, the permissible ambient temperature range can be ex- tended to between -50 °C and +100 °C.
Examples of particularly safety-relevant areas of application are cable railway drives, lifting gear for crane drives or escalator drives. Frequently, the coupling is used to connect the gear shaft to the driven machine. In the case of drives without gear units, the cou- ■ Design A RUPEX coupling comprises two hub sections which are mounted on the machine shafts. The hub parts are connected positively by steel pins and elastomer buffers. The coupling can be fitted with add-on parts such as brake disks or brake drums. Up to size 360, the pins and buffers are fitted on one side. From size 400 up, the pins and buffers are fitted in the hubs on alter- nate sides.
Buffer material NBR standard type 80 ShoreA Buffer black -30 °C ... +80 °C NBR electrically insulating 80 ShoreA Buffer green -30 °C ... +80 °C Materials NBR soft 65 ShoreA Buffer black with green dot -30 °C ... +80 °C Hubs • Types RWN and RWB made of grey cast iron EN-GJL-250 • Types RWS and RBS made of steel NBR hard NR for low temperature 90 ShoreA Buffer black with magenta dot 80 ShoreA Buffer black with white dot -30 °C ... +80 °C -50 °C ... +50 °C HNBR high temperature 80 ShoreA Buffer black with red dot -10 °C ...
+100 °C Flange • Types RFN, RFS made of steel Brake disks • Type RWB made of EN-GJS-400 spheroidal graphite cast iron • Type RBS made of steel Pin Material steel 42CrMo4, surface fine-machined Brake drums • Type RWB made of EN-GJL-250 grey cast iron • Type RBS made of steel 8/2 Siemens MD 10.1 · 2015 Material/description Hardness Identification Ambient temperature