Basic Rolling Bearing
With the information in this section, we hope to assists users
of SKF Bearings to achieve Trouble-Free Operation and optimum
rolling bearing life. There are five basic elements, which
are essential for achieving maximum machine reliability and
2. Correctly designated high quality bearing
3. Damage free installation
4. Correct lubrication
5. Efficient sealing
Why Rolling Bearings ?
A bearing's function is to support and accurately locate a
load, allowing the load to move with the minimum of friction.
For rolling bearings, the load is carried on a rotating shaft
or housing. Plain bearings were popular and used extensively
until the 20th century. The main drawback of plain bearings,
the relatively high friction and lubrication problems at low
speeds and start up, resulted in the need for a more effective
and efficient solution. It had long been realised that rolling
friction was much more efficient than sliding friction. With
the development of improved methods of manufacture and steels,
the rolling element bearing came into its own.
Ball and Roller Bearings
Two distinct families of rolling bearings have been developed:
the ball and the roller bearings. The ball bearing is normally
used in applications where the loads are relatively light
and the speed is high. The contact ellipse between the rolling
element and raceway in the load-carrying zone is very small,
resulting in extremely high contact pressure.
In roller bearings the load is carried over a significantly
larger area due to the line contact between roller and raceway.
These bearings are generally capable of carrying heavier loads
but are restricted in the speed they can operate at.
Within these two families there are many variants each with
specific characteristics and uses. The following are the main
types of ball and roller bearings.