What is a major disadvantage of using friction bearings?

Using friction bearings does indeed have a major disadvantage related to the necessity for more frequent lubrication. Friction bearings, also known as plain bearings or sleeve bearings, operate on the principle of sliding contact between surfaces. This contact generates heat and can lead to increased wear if not properly lubricated.

The requirement for regular lubrication is crucial to reduce friction, manage heat, and minimize wear on both the bearing surfaces and the shaft that it supports. If lubrication is insufficient or not maintained frequently, the friction can become excessive, potentially leading to faster degradation of the bearing and shaft components.

While increased wear on the shaft, lower efficiency, and higher costs could also be considered disadvantages of friction bearings, the critical need for frequent lubrication stands out as a primary operational challenge that directly impacts the reliability and longevity of the bearing system. Thus, ensuring adequate lubrication is vital for the effective functioning of friction bearings.