The function of plum-shaped elastic coupling

　　The plum-shaped elastic coupling has the advantages of small radial size and moment of inertia, no gap, good damping and buffering effects, and strong axial, radial and angular compensation capabilities. It is widely used in metallurgy, petroleum, chemical industry, etc. Lifting and other industries, especially medium and high speed working conditions with frequent starting and forward and reverse rotation.Although the plum blossom flexible coupling has good misalignment compensation capabilities, the misalignment of the coupling still produces additional force and additional torque on the rotor and bearing system, and these additional forces often bring serious consequences.
　　With the advancement of science and technology, the rotor system is gradually developing towards high speed and heavy load. People have realized the seriousness of the coupling misalignment problem. Many scholars have carried out related theoretical and experimental research, but mainly concentrated on the drum gear. Research on misalignment of plum-shaped couplings and diaphragm couplings is rarely seen in various documents.
　　There are three types of coupling misalignment: parallel misalignment, angular misalignment and comprehensive misalignment.This article will explore theoretically the parallel misalignment of plum blossom elastic coupling.
　　The quincunx elastic coupling transmits torque mainly through the engagement of the convex teeth of the two halves of the coupling and the quincunx-shaped elastic body.There is no gap between the protruding teeth and the elastic body. When the axes of the two rotors are relatively offset, the elastic element will deform correspondingly, which plays a role of automatic compensation.
　　As the coupling is rotating, the relative offset direction and offset 5 will periodically change for each elastic body, which is not convenient for mechanical analysis. The author took the relative offset along the center of the elastic body and the center of rotation. The direction of the connection line is along the center of the elastomer.