Expert advice on lubrication of rolling bearings

Paul Boughton

A new publication is now available from precision bearing manufacturer Schaeffler UK. “Lubrication of Rolling Bearings” contains a wealth of useful information for engineers who want to learn more about the principles, methods, selection and testing of lubricants for rolling bearings.

The comprehensive 200-page publication begins by looking at the main principles and theories of rolling bearing lubrication, as well as the key design considerations such as viscosity ratio, fatigue theory, lubricant film thickness, load carrying capacity, calculation of the rating life, and the effects of friction, speed and operating temperature on lubricant performance.
The chapter on “Lubrication Methods” includes grease and oil lubrication, as well as advice and guidance on the selection of the most suitable method. This chapter concludes by providing examples of both individual (single bearing) and centralised lubrication methods (multiple bearings).
“Lubricant Selection” provides in-depth information on how to select the most suitable grease (or lubricating oil) for rolling bearings. This includes information on the influencing factors such as speed, temperature, load, water and moisture, shock and vibration, vacuum conditions, mounting position, bearing type, as well as legal and environmental regulations that may also need to be considered.
Other chapters include “The Supply of Lubricant to the Bearings” including the miscibility of lubricants and the various types of lubrication supply systems and condition monitoring methods for lubricants.
The section on “Contaminants” deals with solid foreign matter, liquid contaminants, gaseous contaminants and the cleaning of contaminated rolling bearings.
Other sections include lubricant testing; the storage and handling of rolling bearings; dry running and media lubrication; and coatings for rolling bearings, including protection against wear, friction and slippage.

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