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

　　2. The relative displacement of the axis of the two shafts is caused by manufacturing and assembly errors, shaft load and thermal expansion deformation, and relative movement between components.

　　3. The allowable dimensions and installation methods are the operating space necessary for ease of assembly, adjustment and maintenance.For large couplings, it should be possible to disassemble and assemble without the need for axial movement of the shaft.

　　4. Considering the working environment, service life, lubrication, sealing and economy and other conditions, and then referring to the characteristics of various couplings, select a suitable coupling type.

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