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Shaft couplings can be divided into rigid couplings and flexible couplings
With rigid couplings, the two shafts should be accurately alignment during installation. The rigid couplings are not able to compensate for shaft misalignment. However, rigid couplings have many advantages, including simple structure, easy assembly, convenient maintenance, and low cost.
The flexible shaft coupling can be classified into elastic couplings and universal joints. The universal joints can only compensate for shaft misalignment. But the elastic coupling can not only achieve the function above but also absorbs shock and vibration.
The flexible coupling can be classified into curved jaw couplings, disc couplings, beam couplings, Oldham couplings and bellows couplings according to their shapes.
Curved jaw coupling :
It has the best ability to absorb impact energy, and is most suitable for servo motors.
Disc coupling:
It is suitable for high speed rotation environments.-
Beam coupling:
It is classified into a helical coupling and parallel slit coupling to accommodate misalignment. 
Oldham coupling:
The center disc can accommodate a high misalignment, and it has relatively low reaction force to reduce the load of shaft and other components.
High-gain rubber type coupling:
It allows for the shortest response time, making the coupling suitable for use in the equipment which needs quick response.
Bellows couplings:
The bellows design can compensate for a high misalignment. In addition, it features quick response and high torsional stiffness.
Coupling functionsA coupling is a component used to connect the driving shaft and the driven component. The main functions are below:Connect the drive shaft and the driven parts to transmit power.
Read MoreRigid Couplings and Flexible CouplingsWith rigid couplings, the two shafts should be accurately alignment during installation. The rigid couplings are not able to compensate for shaft misalignment.
Read MoreShaft Attachment methodsDifferent types of shaft attachment methods are available. We will introduce the common attachment methods below: Set screw type
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