Factory to consider when choosing a shaft coupling: Load category

Due to different structures and materials, the load capacity of couplings varies greatly. The load category forms different types of loads for the impact, vibration, forward and reverse rotation, braking, and frequent start of the working load of the working machine. In order to facilitate the selection and calculation, the load of the transmission system is divided into four categories,

1. Uniform load, stable work, working condition coefficient 1-1.5

2. Medium impact load, working condition coefficient 1.5-2.5

3. Heavy impact load, frequent forward and reverse rotation, working condition coefficient 2.5-2.75

4. Extremely heavy impact load, frequent forward and reverse rotation, working condition coefficient>2.75

The load category of the transmission system is the basic basis for selecting the coupling. For working loads with large changes in shock, vibration and torque, flexible couplings with elastic elements 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 operation. This is overload work, which will inevitably shorten the service life of the coupling elastic element. The coupling is only allowed to be overloaded for a short time, and generally cannot be exceeded. 2-3 times the nominal torque, ie ≥ 2-3T n.

Low-speed and heavy-load conditions should avoid the use of couplings that are only suitable for small and medium power, such as: pin bush coupling, core-type flexible coupling, polygonal rubber coupling, tire coupling, etc.; For shafting systems that control overload and safety protection, safety couplings should be selected; for shafting systems with large load changes and impacts and vibrations, flexible couplings with elastic elements and better cushioning and damping effects should be selected. The load-bearing capacity of the flexible coupling of the metal elastic element is higher than that of the flexible coupling of the non-metal elastic element.