The choice of coupling mainly considers the speed of the required transmission shaft, the size of the load, the installation accuracy of the two connected parts, the stability of rotation, the price, etc., refer to the characteristics of various couplings, and choose a suitable one. Coupling type.

  Most couplings have been standardized or standardized.The designer's task is to choose, not design.The basic steps for selecting a coupling are as follows:

1) The size and nature of the torque to be transmitted and the requirements for the buffer and vibration reduction function.For example, for high-power and heavy-duty transmissions, gear couplings can be selected; for transmissions that require severe impact loads or to eliminate shaft torsional vibrations, tire couplings and other couplings with high elasticity can be selected.

2) The working speed of the coupling and the centrifugal force caused by it.For high-speed transmission shafts, couplings with high balance accuracy, such as diaphragm couplings, should be selected, rather than slider couplings with eccentricity.

3) The magnitude and direction of the relative displacement of the two axes.When it is difficult to maintain strict and precise alignment of the two shafts after installation and adjustment, or when the two shafts will have a large additional relative displacement during the working process, a flexible coupling should be used.For example, when the radial displacement is large, you can choose a slider coupling, and when the angular displacement is large or the connection of two intersecting shafts, you can choose a universal coupling.

4) The reliability and working environment of the coupling.Generally, couplings made of metal components that do not require lubrication are more reliable; couplings that require lubrication are easily affected by the degree of lubrication and may pollute the environment.Couplings containing non-metallic components such as rubber are more sensitive to temperature, corrosive media and strong light, and are prone to aging.

5) Due to reasons such as manufacturing, installation, load deformation and temperature changes, it is difficult to maintain strict and accurate alignment of the two shafts after installation and adjustment.There is a certain degree of displacement in the x and Y directions and the deflection angle CI.When the radial displacement is large, you can choose a slider coupling, and when the angular displacement is large or the connection of two intersecting shafts, you can choose a universal coupling.When the two shafts produce a large additional relative displacement during the working process, a flexible coupling should be used.