When choosing a coupling, the designer should first choose among the couplings that have been formulated as national standards, machinery industry standards, and national patents. Only when existing standard couplings and patented couplings cannot meet the design requirements. You need to design your own coupling.
Understand the comprehensive function of the coupling (especially the flexible coupling) in the transmission system. From the overall design of the transmission system, choose the type and type of coupling. The type of coupling is selected according to the combination of prime mover type and working load type, working speed, transmission accuracy, two-axis offset condition, temperature, humidity, and working environment. According to the needs of the supporting mainframe, choose the structural type of the coupling. When the coupling is used with the brake, the coupling with the brake wheel or brake disc type should be selected. When the overload protection is needed, the safety coupling should be selected. When connecting with the flange, the flange type should be selected; for long-distance transmission, when the axial dimension of the coupling is large, the intermediate shaft type or the intermediate sleeve type should be selected.
The power of the power unit in the transmission system should be greater than the power required by the workpiece machine. According to the power and speed of the power machine, the theoretical short moment T of the high speed end connected with the power machine can be calculated; according to the working condition coefficient K and other relevant coefficients, the calculated torque Tc of the coupling can be calculated. The coupling T is inversely proportional to n, so the low speed end T is larger than the high speed end T.