What aspect of machinery does a coupling predominantly improve?

A coupling predominantly improves alignment between shafts. This mechanical component connects two shafts while allowing for some degree of misalignment. Proper alignment is crucial for the smooth operation of machinery; if shafts are misaligned, it can lead to increased wear and tear on equipment, vibration, and even premature failure of components. Couplings accommodate slight misalignments, ensuring that both shafts rotate in synchrony, which is essential for maintaining operational reliability and longevity of the machinery.

While other aspects, such as torque transmission and potentially aspects of energy efficiency, can be influenced by couplings, their primary purpose is to facilitate proper alignment between rotating shafts in various machines. This helps in ensuring uniform motion and reduces the risk of mechanical failure.