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Rolling-element bearings often work well in non-ideal conditions, but sometimes minor problems cause bearings to fail quickly and mysteriously. For example, with a stationary (non-rotating) load, small vibrations can gradually press out the lubricant between the races and rollers or balls ( false brinelling ).
In normal operation, a rolling-element bearing has the rollers and races separated by a thin layer of lubricant such as grease or oil. [6] [7] [8] Although these lubricants normally appear liquid (not solid), under high pressure they act as solids and keep the bearing and race from touching. [9] [10]
The exact cause of WECs and their significance in rolling bearing failures have been the subject of much research and discussion. [8] [6] Ultimately, the formation of WECs appears to be influenced by a complex interplay between material, mechanical, and chemical factors, [3] including hydrogen embrittlement, high stresses from sliding contact, inclusions, [9] electrical currents, [10] and ...
Overview of bearing components, including bearing element and inner ring [1] Rolling Contact Fatigue (RCF) is a phenomenon that occurs in mechanical components relating to rolling/sliding contact, such as railways, gears, and bearings. [2] It is the result of the process of fatigue due to rolling/sliding contact.
A degrading rolling-element bearing, on the other hand, will usually exhibit vibration signals at specific frequencies increasing in intensity as it wears. Special analysis instruments can detect this wear weeks or even months before failure, giving ample warning to schedule replacement before a failure which could cause a much longer down-time.
A rolling element bearing's static load rating is defined to avoid this failure type. Increasing the number of elements can provide better distribution of the load, so bearings intended for a large load may have many balls, or use needles instead. This decreases the chances of brinelling, but increases friction and other factors.
Different areas of typical false brinelling and fretting corrosion damage in a ball bearing. In rolling element bearings fretting may occur when the bearings are operating in an oscillating motion. Examples of applications are blade bearings in wind turbines, helicopter rotor pitch bearings, and bearings in robots.
Pages in category "Rolling-element bearings" The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes. ...