What are the types of couplings? What are the characteristics

What are the types of couplings? What are the characteristics
Elastic coupling:
It is formed by wire cutting of metal round rods, and commonly used materials include aluminum alloy, stainless steel, and engineering plastics. The integrated design enables the elastic coupling to achieve the advantages of transmitting torque without gaps and requiring no maintenance. Generally, there are two types of fixation: parallel type and threaded type, both of which can be fixed using positioning screws and clamping. The threaded type is most suitable for correcting misalignment and axial misalignment, but its ability to handle eccentricity is relatively poor. Suitable for low torque applications.
Plum coupling:
It is formed by combining two metal shaft sleeves (usually made of aluminum alloy or stainless steel) and a plum blossom elastic spacer, and is driven by pressing. Cannot handle large deviations, especially axial deviations.
Diaphragm coupling:
Consisting of more than one set of diaphragms and two shaft sleeves, there are two types of single diaphragm couplings and dual diaphragm couplings, commonly used in servo systems, which are held tightly by the side or fixed by expanding the sleeve.
Bellows coupling:
It consists of two shaft sleeves and a thin-walled metal tube, usually connected together by bonding or pressing steel bars. This thin and uniform pipe wall allows it to generate very low bearing loads, maintain a constant amount of rotation at each point, unlike other couplings that disrupt the high and low load points of the cycle, and maintain rigidity when subjected to torque loads.
Rigid coupling:
It is a torsional rigid coupling that does not have any rotational clearance even when under load. Even when there is a deviation that generates a load, the rigid coupling still transmits torque rigidly. Any deviation in the system can lead to premature damage to shafts, bearings, or couplings, which means they cannot be used in high-speed environments because they cannot compensate for the relative displacement between shafts caused by high temperatures during high-speed operation.