Couplings can be divided into two types: rigid couplings and flexible couplings.
The rigid coupling does not have the cushioning ability and the ability to compensate the relative displacement of the two axes. It requires two axes to be strictly centered, but the coupling has a simple structure, low manufacturing cost, and assembly and disassembly. It is easy to maintain and can ensure high alignment of the two shafts, large transmission torque and wide application. Commonly used are flange couplings, sleeve couplings and clamp couplings.
Flexible couplings can be further divided into inflexible flexible couplings and flexible flexible couplings. The former class only has the ability to compensate for the relative displacement of the two axes, but it cannot damp vibrations. Common slipping occurs. Block couplings, gear couplings, universal couplings and chain couplings; the latter category contains elastic elements, in addition to the ability to compensate the relative displacement of the two axes, it also has a buffering and damping effect, However, the transmitted torque is limited by the strength of the elastic element, generally less than the flexible coupling of the non-elastic element, the common elastic sleeve pin coupling, the elastic pin coupling, the plum-shaped coupling, the tire type Couplings, serpentine spring couplings, reed couplings, etc.