Failure Investigation of Differential Pinion Tapered Roller Bearing
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Premature bearing failures can be attributed to several factors such as improper selection of bearing, rise in temperature, corrosive media, dirt, abusive handling, improper installation, and servicing practices. In the present study, damage analysis made on the prematurely failed differential pinion tapered roller bearing is discussed. A detailed metallurgical analysis is carried out on the failed bearing and the probable root cause was traced to higher preload on the bearing resulting in temperature rise and degradation of lubrication. Excessive preload caused rubbing of rollers against the cone rib leading to temperature rise. This in turn degraded the lubricant and caused eventual seizure. The steep rise in temperature was confirmed by the presence of untempered martensitic structure in the raceway load zone of the cone.
KeywordsTapered roller bearing Premature failure Untempered martensite Preload Differential pinion bearing
The authors wish to express sincere thanks to Mr. N.K. Gupta of Metallurgy division and Mr. Rahul K. Modi of Advanced materials technology division of the National Engineering Industries Limited for their support and inputs.
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