What is the purpose of a coupling between the driver and driven shaft?

The purpose of a coupling between the driver and driven shaft is to ensure proper alignment between both shafts. Aligning the shafts is crucial for the efficient transfer of power and to minimize wear and tear on the equipment. When shafts are misaligned, it can lead to excessive vibration, increased friction, and even premature failure of components. A well-aligned coupling helps maintain the relationship between the shafts, ensuring smooth operation and longevity of the machinery involved.

In addition, while other options like absorption of vibrations or reducing friction may be secondary benefits, the primary role of a coupling is to facilitate alignment, which is fundamental to effective mechanical operation.