1. Elastic coupling:

It is made of metal round bar wire, and the commonly used materials are aluminum alloy, stainless steel, and engineering plastics. The one-piece design allows the elastic coupling to achieve the advantages of zero torque transmission and no maintenance. Generally, there are two types of parallel type and thread type, both of which can be fixed by means of positioning screws and clamping. The screw type is most suitable for correcting declination and axial deviation, but the ability to deal with eccentricity is relatively poor. It is more suitable for low torque applications.

2. Plum blossom coupling:

It is composed of two metal bushes (usually made of aluminum alloy or stainless steel) and a plum blossom elastic spacer, which is driven by compression. Can not deal with large deviations, especially axial deviations.

3. Diaphragm coupling:

It is composed of more than one set of diaphragms and two shaft sleeves. There are two types of single diaphragm couplings and double diaphragm couplings. They are generally tightly clamped on the side or fixed by expansion sleeves. They are often used in servo systems.

4. Bellows coupling:

It consists of two shaft sleeves and a thin-walled metal tube, usually they are connected together by means of bonding or steel bar compression. This thin and uniform pipe wall makes it produce a very low bearing load, maintaining a constant amount of rotation at each point, instead of destroying the high and low load points of the cycle like other couplings, and maintaining when subjected to torque loads rigidity.

5. Rigid coupling:

It is a torsionally rigid coupling. Even if it is under load, there is no slewing clearance. Even if there is a deviation to produce a load, the rigid coupling still transmits torque rigidly. If there is any deviation in the system, it will cause premature damage to the shaft, bearing or coupling, which means that it cannot be used in a high-speed environment because it cannot compensate for the relative displacement between the shafts due to the high temperature generated by high-speed operation.

       These are commonly used. Encoders generally use parallel couplings and threaded couplings. Stepper motors and servo motors generally use diaphragm couplings, plum blossom couplings, slider couplings and bellows couplings. . Select the coupling and secondly determine the torque of the coupling, its outer diameter, inner hole and length.