When selecting a coupling type, the following items should be considered:

1. The working environment, service life and conditions such as smoothness, sealing and economy should be considered, and then refer to the characteristics of various couplings, and select a suitable coupling type.

2. The size and nature of the torque to be transmitted, the requirements for buffering and damping functions, and whether resonance may occur.

3. The relative displacement of the axes of the two shafts is caused by manufacturing and device errors, shaft load, thermal expansion and deformation, and relative movement between components.

4. The allowable dimensions and installation methods are the necessary operating space for the convenience of installation, adjustment and maintenance.Regarding large-scale couplings, it should be possible to disassemble and assemble without the need for axial movement of the shaft.