Flexible coupling. Flexible couplings can be divided into flexible couplings with no elastic elements, flexible couplings with non-metallic elements, flexible couplings with metal elastic elements and combined flexible couplings. There are two ways to compensate the relative displacement between the two shafts by the flexible coupling. One is to rely on the relative movability between the connecting elements to make the two coupling halves move relative to each other, thereby compensating for the alignment error of the two connected shafts during installation and the relative displacement during operation.

The other is to place an elastic element in the coupling. The elastic element can produce significant elastic deformation when loaded, so that the two halves of the coupling can move relative to each other to compensate for the relative displacement between the two shafts. At the same time, the elastic element also It has a certain buffering and damping capacity. There are two types of materials for making elastic elements: non-metallic and metallic. Non-metallic materials include rubber, plastic, etc., which are characterized by light weight, low price and strong vibration damping ability, especially suitable for occasions where the working load changes greatly. The elastic elements (mainly various springs) made of metal materials have high strength, small size and long service life.

①Flexible coupling without elastic element. The components of this type of coupling are relatively movable, so they can compensate for the relative displacement between the two shafts, but because there are no elastic elements, they cannot buffer and reduce vibration. Figures 2-74 to 2-78 show several typical flexible couplings with no elastic elements.

Non-metallic elastic element flexible coupling. There are many types of non-metallic elastic element flexible couplings, as shown in Figure 2-79 ~ Figure 2-82.

Safety coupling. When the transmitted torque exceeds the specified value, the connecting elements of the safety coupling will be broken, separated or slipped, causing the transmission to be interrupted, thereby protecting other important parts from damage. Safety couplings can be divided into two categories: flexible safety couplings and rigid safety couplings (see Figure 2-83).Application range:amusement park、Family entertainment center、game center、shopping mall.