True brinelling is caused by shock or excessive loads due to improper mounting, dropping of machinery during handling, excessive static or impact loads during the operating cycle. The signs of this type of brinelling are regularly-spaced indentations in the bearing raceway and rolling elements, and an increase in vibration.
False brinelling is caused by vibrations acting on the bearing while in a non-rotating state and may occur on new equipment which has been carelessly transported. The signs of this type of brinelling, as seen in the image to the right, are depressions and wear marks in the bearing raceway along the axial direction. These depressions cause more noise and eventual fatigue.
How to Prevent Brinelling
Brinelling is typically caused by a heavy load resting on a stationary bearing for an extended length of time. Both true brinelling and false brinelling have different preventive methods. The best way to prevent bearing true brinelling is to avoid unnecessary shock or high impact loads, and isolate the bearings from any external vibration. When looking into bearing false brinelling prevention, reduce or eliminate external vibration and ensure the shaft has been properly blocked and packaged during shipment.
By understanding what brinelling is and how to identify its symptoms, you will be able to help prevent premature bearing failures. For more information on Rexnord Bearings such as installation manuals, videos and product specifications, click here.