The allowable speed range of the coupling is determined by calculation based on the maximum outer edge dimension of the line speed allowed by the different materials of the coupling. The allowable speed range of the couplings of different materials, varieties and specifications is different. Changing the material of the coupling can increase the allowable speed range of the coupling. The allowable speed of the material is greater than the allowable speed of the cast iron.
Relative displacement of two axes
The two shafts connected by the coupling are relatively displaced due to various factors such as manufacturing error, assembly error, installation error, shaft load and deformation and deformation, base deformation, bearing wear, temperature change, and relative motion between components. Under normal circumstances, the relative displacement of the two axes is difficult to avoid, but the direction of the equilibrium displacement of the shafting transmission under different working conditions, that is, the axial direction, the radial angular direction and the displacement amount are different. Only flexible couplings have the ability to compensate for the relative displacement of the two axes, so a large number of flexible couplings are selected in practical applications. Rigid couplings are not limited to compensating applications and are therefore used in small quantities. A shaft coupling with a large angular displacement should use a universal joint; a shaft drive with axial yaw and control of axial displacement should use a diaphragm coupling; only the alignment accuracy is high. Only rigid couplings are used.