SIZING AND SELECTION ELASTIC JAW COUPLINGS EK
Symbols
| TKN | Rated torque of the coupling (Nm) |
| TKmax | Maximum torque rating coupling (Nm) |
| TS | Peak torque applied to the coupling (Nm) |
| TAS | Peak torque of the drive system (Nm) |
| TAN | Nominal torque of the drive system (Nm) |
| TLN | Nominal torque of the load (Nm) |
| P | Drive power (kW) |
| n | Rotational speed (min.-1) |
| JA | Total load inertia (kgm2) (motor including gear ratio + 1/2 of coupling) |
| JL | Total load inertia (kgm2) (load + drive line components + half of coupling) |
| J1 | Moment of inertia of driving coupling half (kgm2) |
| J2 | Moment of inertia of driven coupling half (kgm2) |
| m | Ratio of the moment of inertia of the drive to the load |
| υ | Temperature at the coupling (also consider radiant heat) |
| Sυ | Temperature factor |
| SA | Load factor |
| SZ | Start factor (factor for the number of starts per hour) |
| Zh | Number of starts per hour (1/h) |
Coupling selection for operation withour shock or reversal
The rated torque of the coupling (TKN) must be greater than the rated torque of the load (TLN), taking into account the temperature at the coupling (Temperature factor Sυ). Should TLN be unknown, TAN can be used as a substitute in the formula.
Coupling selection for operation with shock loads
Same basic conditions as above. In addition, the maximum torque rating of the coupling (TKmax) is dictated by peak torque (TS) due to shock loads.
