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Drives with periodical torsional vibrations. For drives subjectto high torsional vibrations, e. g. diesel engines, piston compres-sors, piston pumps, generators, etc., it is necessary to perform atorsional vibration calculation to ensure a safe operation. If re-quested, we perform the torsional vibration calculation and thecoupling selection in our company. For necessary details pleasesee KTR standard 20004. Drives without periodical torsional vibrations e. g. centrifugal pumps, fans, screw compressors, etc. The coupling is selected taking into account the rated torquesTKNand maximum torque TK max.2.

KTR catalog complete - 14739 ROTEX

®

Torsionally flexible coupling

Load produced by rated torque

Coupling selection

Taking into account the ambient temperature, the permissiblerated torque TKNof the coupling has to correspond at least to the rated torque TNof the machine.2.2 The ROTEX
® coupling is selected in accordance with DIN 740 part 2. The coupling has to be dimensioned in a way that the permissible couplingload is not exceeded in any operating condition. For this purpose the actual loads have to be compared to the permissible parameters of the coupling.1.1 Passing through the resonance range Taking into account the temperature, the peak torque TSarising when the resonance range is run through must not exceed the maximum torque TKmaxof the coupling.2.3 Load produced by vibratory torque shocks Load produced by ratedtorque Taking into account the ambient temperature, the per-missible vibratory torque TKWof the coupling must not be exceeded by the highest periodical vibratory torque TWwith operating speed.For higher operating frequencies f > 10, the heat produced bydamping in the elastomer part is considered as damping powerPW.The permissible damping power PKWof the coupling depends on the ambient temperature and must not be exceeded by the damping power produced.rated torque TNof the machine is at the same time subject toshocks.Knowing the mass distribution, shock direction and shock mode,the peak torque TScan be calculated.For drives with A. C.-motors with high masses on the load side wewould recommend to calculate the peak driving torque with thehelp of our simulation programme.1 Taking into considerationthe ambient temperature,the permissible rated torque TKNof the couplinghas to correspond at leastto the rated torque TNofthe machine.1.2
–––––––- P [kW]TN[Nm] = 9550· n [1/min] Load produced by torque shocks TKN≥ TN· St TKN≥ TN· St The permissible maximumtorque of the coupling hasto correspond at least tothe total of peak torque TSand the rated torque TNofthe machine, taking intoaccount the shock fre-quency Z and the ambienttemperature.This applies in case if the2.1 TK max≥ TS· St
TK max≥TS· Sz· St+ TN· St Drive-sided shockTS= TAS· MA· SALoad-sided shockTS= TLS· ML· SL TKW ≥ TW· St
JLJAMA =–––––––ML =––––––– JA+ JLJA+ JL PKW ≥ PW DescriptionSymbolDefinition or explanation DescriptionSymbolDefinition or explanation
Rated torque TKNTorque that can continuously be transmitted of couplingover the entire permissible speed range MaximumTK maxTorque that can be transmitted as dynamic torqueload Peak torque of TLSPeak torque with torque shock on load load sideside, e. g. brakingVibratory torque of TWAmplitude of the vibratory torque effective machineon the couplingDamping powerPWDamping power which is effective on theof the machinecoupling due to the load produced by thevibratory torqueMoment of inertiaJATotal of moments of inertia existing on theof driving sidedriving or load side referring to the coupling speedMoment of inertiaJLof load sideRotational inertia MAFactor taking into account the masscoefficient of drivingdistribution with shocks and vibrationssideproduced on the driving or load side 10 5 times or 5 x 10 4 as vibratory of couplingload, respectively, during the entire operating life of the couplingVibratory torque of TKWTorque amplitude of the permissible perio-couplingdical torque fluctuation with a frequency of 10 Hz and a basic load of TKNor dynamic load up to TKN, respectively Damping powerPKWPermissible damping power with an of couplingambienttemperature of + 30 °C.Rated torqueTNStationary rated torque on the couplingof machineRated torque of TANRated torque of machine, calculated from driving side rated power and rated speedRated torque of TLNMaximum figure of the load torque load sidecalculated from power and speedPeak torque of machine TSPeak torque on the couplingPeak torque on theTASPeak torque with torque shock on the driving side,driving sidee. g. breakdown torque of the electric motor JLJAMA =ML =(JA+ JL)(JA+ JL) Rotational inertiaMLcoefficient of load side

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