Roller Bearings
Rolling bearings reduce friction between contacting surfaces in rotary motion by introducing rolling elements.
The purpose of rolling bearings, also called anti-friction bearings, is to minimise friction in rotating systems by replacing sliding friction between surfaces in contact with each other by the greatly reduced rolling friction which prevails between rolling elements and their raceways.
A bearing has an outer ring and an inner ring which are separated by rolling elements which, depending on type, are balls, cylindrical rollers, needle rollers, spherical or taper rollers. In most cases modern bearings are desigend with a metal or plastics cage to keep the rolling elements apart.
Rolling bearings allow for precise rotational movement between parts under load with greatly reduced friction. Any machine which involves rotational movement such as a motor vehicle, an aircraft, rolling stock, mills or paper-making machine or automation equipment contains rolling bearings.
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