In a rigid coupling, the torque is transmitted from one half of the coupling to the other through the bolts and in this arrangement shafts need be aligned very well. However, in the bushed coupling the rubber bushings over the pins (bolts) (as shown in Figure 16.2) provide, flexibility and can accommodate, some misalignment. Because of the rubber bushing the design for pins should be considered carefully.
Figure 16.2 Flexible Bushed Coupling
Advantages of flexible bushed coupling
- It can bear 0.5 mm of lateral or axial misalignment and 1.5° of angular misalignment.
- It prevents transmission of shock from one shaft to the other and absorbs vibrations.
- It is used for transmission of high torque.
- It is easy to assemble and disassemble due to simple design.
Disadvantages of flexible bushed coupling
- Its cost is higher than the rigid flange coupling.
- It requires more radial space.
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