Bearing failure: the causes and cure.

A single cylindrical roller bearing was supplied to us for inspection and report. From information provided, we understand that the bearing had been fitted to an electric motor and that the end user required confirmation of the failure mode.

Bearing Issues in Electric Motors The increased use of Variable Frequency Drives (VFDs), in recent years, has aided in reducing electricity costs substantially but has also caused increased numbers in premature bearing failure. The rising numbers of failures can be attributed to electrical fluting or, an issue also known as, electrical erosion.

Bearing engineers generally use fatigue as the normal failure mode, on the assumption that the bearings are properly installed, operated and maintained. Today, because of improvements in manufacturing technology and materials, bearing fatigue life, which is related to sub-surface stresses, is not the limiting factor and accounts for less than 3% of failures in service.

How To Diagnose Rolling Bearing Failures. As with plain bearings, analysing and diagnosing rolling bearing failures is all about recognising the visual signs associated with typical failure modes. The first step is therefore to perform a careful inspection of the failed roller bearing race, cage and housing.

If the wear is excessive, the life of the bearing will be reduced significantly. The result is a contamination-induced bearing failure. But even when contamination is minimized, if the lubricant selected for the application does not meet the operating and environmental requirements, a lubricant- induced bearing failure will occur.

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The hardness of the seized bearing races and balls were measured to be 60 to 61 Rockwell C. The inner and outer races and a ball from a large seized bearing were determined to be made of E52100 bearing steel. The composition and hardness of the components were found to be typical and acceptable for ball bearings. ANALYSIS.

Understanding the root cause of bearing failures by review of the wear patterns generated through progression of a fault in a rotating system. Techniques such as ICP-OES, hardness testing, electron microscopy and energy dispersive x-ray analysis are then also used to review lubricant condition and metallurgical properties to assess likely causes of failure.

Main Bearing Failure Modes. The simplest way to identify the failure mode of a bearing is to examine the sleeve surface and characterize how the material itself failed. Each failure mode can have several different root causes that lead to the eventual failure of the bearing surface.

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FAILURE ANALYSIS Methodology The crank pins and bush bearings have undergone wear failure. This being a surface phenomenon, the examination of the surface and characterization to identify the fundamental mode of wear is essential. The process of wear also generates the wear debris, which can give the clue to the type of wear.

Bearing Failure Analysis. The accurate diagnosis of a bearing failure is imperative to prevent repeated failures and their additional expenses. This comprehensive guide to bearing failures outlines the many ways bearings can and do fail. Industry Solutions and Bearing Resources. If you'd like to learn how bearings are being used in your.