An Experimental Study of Journal Bearing Lubrication Effected by Journal Misalignment as a Result of Shaft Deformation Under Load

Abstract

Journal bearing friction pair system is one of the most general and essential parts used in various mechanical devices. A special test bench is developed for the study on lubrication performance of cylindrical journal bearings. The effect of journal misalignment as a result of shaft bending under load is studied. The results show obvious changes at distribution and value of oil film pressure, oil film thickness and oil temperature of journal bearing due to journal misalignment. The higher the load on the shaft, the larger the journal misalignment resulted from shaft deformation, the more obvious effect on lubrication performance of journal bearing.

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

“…The misalignment caused more significant changes in bearing performance when the rotational speed or load was low, and the hydrodynamic effects were then relatively small and the bearing offered less resistance to the misalignment. Sun et al [394] also developed a special test bench for studying the lubrication performance of cylindrical journal bearings considering journal misalignment. The results indicated that the journal misalignment led to the obvious changes at distribution and oil film pressure, oil film thickness and, oil temperature of journal bearing, and the higher the load on the shaft.…”

Edge loading and running-in wear in dynamically loaded journal bearings

“…Sun et al [10] experimentally investigated the behaviour of misaligned journal bearings due to elastic shaft deformation. At a specific amount of rotational load he identified an increase of bearing temperature and a reduction of the maximum hydrodynamic pressure caused by metalmetal contact at the bearing edge.…”

On the Characteristics of Misaligned Journal Bearings

“…The results showed that there are obvious changes in pressure distribution, the maximum pressure, film thickness, the minimum film thickness, and the misalignment moment when misalignment takes place. Later Sun et al [75,76] in 2005 investigated the effects of journal misalignment caused by shaft deformation under static and rotary loads. The results showed that the higher the load on the shaft, the larger is the journal misalignment resulted from shaft deformation, and the more obvious becomes the effect on lubrication performance of journal bearing.…”