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1) the required size of the torque and the nature of the buffer and the requirements of the buffer. For example, the high power of heavy load transmission, can choose the type of gear coupling; the severe impact load or require the elimination of shaft torsional vibration of the transmission, the use of tire type coupling and so has a high elastic coupling.

2) the working speed of the coupling and the centrifugal force caused by the rotation speed of the shaft. For high speed drive shaft, the coupling of high precision and high precision, such as diaphragm coupling, and so on.

3) two relative displacement magnitude and direction. When the installation and adjustment, it is difficult to maintain two axis precise of, or work in the process of two axis will produce an additional large relative displacements, should use flexible coupling. For example, when the radial displacement is large, optional slide coupling, angular displacement larger or universal coupling can be used for connecting the two axes intersecting etc..

4) coupling reliability and working environment. It is usually made of metal components without lubrication of the coupling is more reliable; the need to lubricate the coupling, its performance is easy to be affected by the degree of lubrication, and may pollute the environment. Coupling containing rubber and other non-metallic components of temperature, corrosive medium and strong light, and more sensitive, and easy to aging.

5) because of the manufacture, installation, load deformation and change of temperature, etc., when the installation and adjustment, it is difficult to maintain two axis strictly accurate to. There is a certain degree of X, Y direction displacement and deflection angle CI. When the radial displacement is large, optional slide coupling, angular displacement larger or universal coupling can be used for connecting the two axes intersecting and so on. When the two work in the process of generating additional relatively larger displacement, should use flexible coupling.