Why the short-term overload of the coupling must not exceed 2-3 times the nominal torque

XINLAN analysisCouplingThe load category of the transmission system is the basic basis for selecting the type of coupling.For working loads with large changes in shock, vibration and torque, flexible couplings with elastic elements, that is, elastic couplings, should be selected to buffer, reduce vibration, compensate for axis deviation, and improve the performance of the transmission system.The torque during frequent starting, forward and reverse rotation, and braking is several times the torque during normal and stable work. It is overload work, which will inevitably shorten the service life of the elastic element. The coupling is only allowed to be overloaded for a short time. Generally, the short-term overload must not exceed 2-3 times the nominal torque.
      The mechanical characteristics of the coupling power machine have a certain impact on the entire transmission system. For different types of power machines, due to their different mechanical characteristics, the corresponding power machine coefficient K should be selected, and the best coupling suitable for the system should be selected.The type of power machine is the basic factor for selecting the type of coupling; the power of the power machine is one of the main basis for determining the size of the coupling, and it is proportional to the torque of the coupling.Most of the power machines in the transmission system of fixed mechanical products are electric motors. The power machines in the transmission systems of mechanical products (such as ships, various vehicles, etc.) are mostly internal combustion engines. When the power machines are internal combustion engines with different cylinder numbers, the torsional vibration must be considered. The influence of the transmission system is related to the number of cylinders of the internal combustion engine and whether each cylinder is working normally.At this time, flexible couplings should generally be selected to adjust the natural frequency of the axis, reduce the torsional vibration reduction, thereby damping, buffering, and protecting the transmission device components, improving the centering performance, and increasing the stability of the output power.
      Between the power machine and the working machine, the main and the driven ends are connected through one or several couplings of different varieties or different types and specifications to form a shaft transmission system.In mechanical transmission, power machines are nothing more than electric motors, internal combustion engines and steam turbines.Due to the different working principle and structure of the power machine, its mechanical properties are quite different. Some run smoothly, and some have shocks during operation, which have unequal effects on the transmission system.
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