Formula symbols

Formula symbols

Name Symbol Unit Explanation
Torsional stiffness, dynamic CTdyn Nm/rad For calculating torsional vibration
Excitation frequency J kgm2 Excitation frequency of motor or driven machine
Moment of inertia ferr Hz Moment of inertia of coupling sides 1 and 2
Axial misalignment ∆Ka mm Axial misalignment of the coupling halves
Radial misalignment ∆Kr mm Radial misalignment of the coupling halves
Angular misalignment ∆Kw ° Angular misalignment of the coupling halves
Service factor FB   Factor expressing the real coupling load as a ratio of the nominal coupling load
Frequency factor FF   Factor expressing the frequency dependance of the fatigue torque load
Temperature factor TF   Factor taking into account the reduction in strength of flexible rubber materials at a higher temperature
Weight m kg Weight of the coupling
Rated speed nN min-1 Coupling speed
Maximum coupling speed nKmax min-1 Maximum permissible coupling speed
Rated power PN kW Rated output on the coupling, usually the output of the driven machine
Rated torque TN Nm Rated torque as nominal load on the coupling
Fatigue torque TW Nm Amplitude of the dynamic coupling load
Maximum torque Tmax Nm More frequently occuring maximum load, e.g. during starting
Overload torque TOL Nm Very infrequently occurring maximum load, e.g. during short circuit or blocking conditions
Rated coupling torque TKN Nm Torque which can be transmitted as static torque by the coupling over the period of use.
Maximum coupling torque TKmax Nm Torque which can be frequently transmitted (up to 25 times an hour) as maximum torque by the coupling.
Coupling overload torque TKOL Nm Torque which can very infrequently be transmitted as maximum torque by th coupling.
Fatigue coupling torque TKW Nm Torque amplitude which can be transmitted by the coupling as dynamic torque at a frequency of 10 Hz over the period of use.
Resonance factor VR   Facotor specifying the torque increase at resonance
Temperature Ta °C Ambient temperature of the coupling in operation
Damping coefficient Ψ Psi Damping parameter