Spherical plain is a self- aligning bearing consisting of an outer and an inner ring. Spherical plain is particularly suitable for the accommodation of heavy radial load. It can also carry a certain amount of thrust in various directions. There is several kind of types as to be lubricated, self – lubricating and accommodate for heavy or light load.
Life of the spherical plain bearing to be serviced ,can be intended as the number of completed oscillations or the number of hours functions. Generally it is very difficult to carry out a precise calculation of the duration, due to the condition of different elements, among which the movement, the maintenance, the lubrication and duration itself of other conditions of use, such as loads, bumps, impurities in the environment that often make it difficult if not impossible to calculate and evaluate. One must consider, as much as possible, each of the above mentioned elements, because it is influence directly the duration of the spherical bearing. It is always good practice to follow the previous applicative experience.