Depending on the working conditions, the coupling must have the following properties:
(1) Movability. The mobility of a coupling refers to the ability to compensate for the relative displacement of two rotating components. Factors such as manufacturing and installation errors between connected components, temperature changes during operation, and load deformation all put forward requirements for mobility. Movability compensates or alleviates the additional loads between shafts, bearings, couplings and other components caused by the relative displacement between rotating components.
(2) Buffering. For occasions where loads are frequently started or working loads change, the coupling must have elastic elements that play a buffering and vibration reduction role to protect the prime mover and working machine from damage or no damage.
(3) Safe and reliable, with sufficient strength and service life.
(4) Simple structure, easy to assemble, disassemble and maintain.
Selection of coupling type When selecting a coupling type, the following items should be considered.
① The size and nature of the required torque to be transmitted, the requirements for buffering and vibration reduction functions, and whether resonance may occur.
② The degree of relative displacement of the two shaft axes caused by manufacturing and assembly errors, shaft load and thermal expansion deformation, and relative movement between components.
③ Allowable dimensions and installation methods, in order to facilitate the necessary operating space for assembly, adjustment and maintenance. For large couplings, it should be possible to disassemble and assemble without the need for axial movement of the shaft.
In addition, the working environment, service life, lubrication, sealing and economic conditions should also be considered, and then refer to the characteristics of various couplings to select a suitable coupling type.
