FLENDER Standard Couplings Highly Flexible Couplings — ELPEX Series © Siemens AG 2015 General information ■ Configuration The ELPEX coupling is especially suitable for rough opera- tion. An application factor different from that in catalog section 3 is therefore sufficient for all applications. In the case of machines which excite torsional vibration, Siemens urgently recommends carrying out a torsional vibration calculation or measuring the coupling load occurring in the drive. Coupling load due to dynamic torque load Applying the frequency factor FF, the dynamic torque load must be lower than the coupling fatigue torque.
Dynamic torque load T KW ≥ T W ⋅ FT ⋅ FF ⋅ 0.6 FB – 1.0 Coupling selection Coupling load in continuous operation Frequency of the dynamic torque load f err ≤ 10 Hz frequency factor FF = 1.0 The operating principles of the driving and driven machines are divided into categories and the application factor FB derived from these in accordance with DIN 3990-1. Frequency of the dynamic torque load f err > 10 Hz frequency factor FF = √ ( f err / 10 Hz) Checking the maximum speed: The following must apply to all load situations:
n Kmax ≥ n max Checking permitted shaft misalignment and restorative forces Electric motors, hydraulic motors, gas and water turbines 1.0 1.3 1.4 For all load situations the actual shaft misalignment must be less than the permitted shaft misalignment. Internal combustion engines 1.3 1.4 1.6 Checking bore diameter, mounting geometry and coupling design Examples of torque characteristic in driven machines: • uniform with moderate shock loads: generators, fans, blowers • non uniform: reciprocating compressors, mixers, conveyor systems • very rough: crushers, excavators, presses, mills The check must be made on the basis of the dimension tables.
On request, couplings with adapted geometry can be provided. Checking shaft-hub connection Please refer to catalog section 3 for instructions. Checking temperature and chemically aggressive environment ELPEX NR 1.1 1.0 1.25 1.40 1.60 The permitted coupling temperature is specified in the Temper- ature Factor FT table. In the case of chemically aggressive envi- ronments, please consult the manufacturer. NR: Natural rubber mixture Select size with: T KN ≥ T N ⋅ FB ⋅ FT Coupling load at maximum and overload conditions The maximum torque is the highest load acting on the coupling in normal operation.
Maximum torques at a frequency of up to 25 times an hour are permitted and must be lower than the maximum coupling torque. Examples of maximum torque conditions are: Starting opera- tions, stopping operations or usual operating conditions with maximum load. 12 T Kmax ≥ T max ⋅ FT Overload torques are maximum loads which occur only in com- bination with special, infrequent operating conditions. Examples of overload torque conditions are: Motor short circuit, emergency stop or blocking because of component breakage. Overload torques at a frequency of once a month are permitted and must be lower than the maximum overload torque of the coupling.
The overload condition may last only a short while, i.e. fractions of a second. T KOL ≥ T OL ⋅ FT 12/4 Siemens MD 10.1 · 2015 Application factor FB Torque characteristic of the driven machine Torque characteristic of the driving machine uniform with moderate shock loads non uniform very rough Temperature factor FT Temperature Ta on the coupling Coupling Elastomer material -40 °C to -30 °C -30 °C to +50 °C to 60 °C to 70 °C to 80 °C