Date: 2013-08-20

NSK spherical roller bearing in the gearbox failure modes analysis of causes

　　High-speed operation under the conditions of high temperature rise at the same time, large temperature difference between inner and outer rings, inner and outer rings as thermal expansion does not, resulting in radial clearance reduction, resulting in spherical roller bearings are stuck.
　　(1) the full complement roller structure. Roller to scroll through direct contact with the surface at work, occurring between and sliding, forcing larger roller contact area is not easy to form liquid dynamic lubrication film, therefore, under certain conditions, roller damage is not caused by friction or knock but injury due to fatigue failure.
　　(2) retaining rings and touches with the retaining ring for axial location of washers (fig 1). Retaining ring external diameter is too large, increase the roller end faces and flat contacts on the retaining ring of, to the detriment of lubricant film formation, increase the wear of rollers, is not conducive to bearing axial force. And contact washers and retaining ring designs excessive and gap-free contact with the retaining ring, is not conducive to formation of splash lubrication, resulting in larger temperature rise. At the same time the second longest axes, less rigid, systems manufacture error of spherical roller bearings, there is a certain radial internal clearance, resulting in displacement and deflection of the shaft end will have a certain, lead to a second axes turning center line and spherical roller bearing slewing center line does not coincide, caused early failure of the spherical roller bearing.
　　(3) the axial clearance. Axial internal clearance of spherical roller bearings cannot meet the circumstances of the axial displacement of the shaft, roller end faces and flanges and plain between the retaining ring will lose pressure oil film to direct contacts, when roller working at high speed, easy roller end faces caused by excessive wear.

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