What are the two major classifications of bearings?

The classification of bearings into friction and anti-friction highlights the fundamental differences in how these two types operate and the resulting performance characteristics.

Friction bearings, also known as plain bearings, work on the principle of sliding surfaces where one part moves over another. These bearings create a resistance through direct contact, resulting in friction, which can lead to wear over time.

On the other hand, anti-friction bearings, primarily rolling-element bearings, minimize the friction between moving parts by incorporating rolling elements such as balls or rollers. This design allows for greater efficiency and load-bearing capacity, as it significantly reduces the contact area and, therefore, the frictional forces involved.

The distinction made in this classification is important in bearing selection for various applications, as it influences factors like efficiency, wear rates, maintenance needs, and overall performance in machinery. Understanding these two categories helps in making informed decisions in troubleshooting or replacing components in machinery.