Turning Bearing Failure into Bearing Success

(Image courtesy of toyotaoffroad.com)

There's an interesting article in Gear Solutions magazine this month regarding the identification and analysis of failed bearings. The article discusses how important it is for engineers to dissect bearings that have failed prematurely on a visual level, as well as taking the time to fix the causes of the failure as opposed to trying to re-invent their whole process. It is common in the gear industry for someone to say "Well, this bearing arrangement didn't withstand the amount of stress it was supposed to, we either need to implement a new set-up or at least the same process with a new material." The article discusses the problems and causes thusly:

"Most bearing failures such as flaking and pitting, spalling unusual wear patterns, rust and corrosion, creeping, skewing and others are usually attributed to a relatively small group of causes that are often inter-related and correctable. These causes include lubrication, mounting, operational stress, bearing selection, and environmental influence."

The article then gives a breakdown of the likelihood of each of the causes of bearing failure. Lubrication issues, including unsuitable, insufficient or aged lubricant, total fifty-five percent of bearing failures. Around thirty percent of failures were attributed to solid and liquid contamination, leaving only fifteen percent for errors such as "wrong bearing chosen" or "errors while mounting". Using these statistics, one can see that the majority of bearing failures are the result of miscalculations regarding lubrication, whereas only 1/3 of failures are due to standard wear and tear, and less than 1/5 of failures are the result of incorrect bearing selection or implementation. Keep these figures in mind the next time one of your bearings fails, you might save yourself some money by fixing something as simple as lubricant distribution, rather than replacing an entire arrangement.

To read the article from Gear Solutions magazine, you can download the entire issue from the link below:

http://gearsolutions.com/magazine/currentIssue