Due to the different construction and materials, the coupling capacity of the couplings used in the transmission systems of various mechanical products varies greatly. The load category mainly forms different types of loads for the impact, vibration, forward and reverse, braking, frequent starting, etc. of the working load of the working machine. In order to facilitate the selection of calculations, the load of the transmission system is divided into four categories.
The load category of the traditional system is the basic basis for selecting the type of coupling. For working loads with large changes in impact, vibration and transfer, flexible couplings with elastic elements, ie elastic couplings, should be selected to cushion, damp, compensate axis offset and improve the performance of the transmission system. Frequent starting, reverse rotation, and braking torque are several times the torque during normal smooth operation. It is overloaded, which will shorten the service life of the coupling elastic components. The coupling only allows short-time overload, generally short-time. The overload must not exceed 2 to 3 times the nominal torque, ie [Tmax] ≥ 2~3Tn.
Low-speed heavy-duty conditions should avoid the use of couplings that are only suitable for medium and small power, such as: elastic sleeve pin couplings, core-type elastic couplings, polygonal rubber couplings, tire couplings, etc.; For shafting systems that control overload safety protection, safety couplings should be used; shafts with large load changes and shock and vibration should be selected. Flexible couplings with elastic components and good cushioning and damping effects should be selected. The metal elastic coupling has higher bearing capacity than the non-metallic elastic element elastic coupling; the elastic coupling of the elastic element is more reliable than the elastic coupling of the elastic element being sheared.