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1. Coupling function

It is used to connect the two axes together. When the machine runs, the two axes cannot be separated. Only when the machine stops and disconnects the connection, the two axes can be separated.

2. Types of coupling

Because of the manufacturing and installation errors, the deformation after loading and the influence of temperature change, the relative position of the two axes connected by the coupling will change, and the rigorous alignment can not be guaranteed. Coupling can be divided into rigid coupling, flexible coupling and safety coupling according to whether the coupling has elastic elements, whether it can compensate for various relative displacements, that is, whether it can maintain the connection function under the condition of relative displacement and the use of the coupling.

Rigid coupling: It can only transmit motion and torque, and has no other functions, such as flange coupling, sleeve coupling, clamp coupling, etc.

Flexible couplings: Flexible couplings without elastic elements can not only transmit motion and torque, but also have different degrees of axial, radial and angular compensation performance, including gear couplings, universal couplings, chain couplings, slider couplings and so on.

Flexible couplings with elastic elements can transmit motion and torque; they have different degrees of axial, radial and angular compensation performance; they also have different degrees of vibration reduction and cushioning effect to improve the working performance of transmission system, including flexible couplings with various non-metallic elastic elements and flexible couplings with metal elastic elements. Elastic couplings have different structures and different functions in transmission systems.

Safety coupling: transfer movement and torque, overload safety protection. Flexible safety coupling also has different compensation performance, including pin type, friction type, magnetic powder type, centrifugal type, hydraulic type and other safety coupling.