Motor Bearing Lubrication
Reliable lubrication of the motor bearings is necessary to maintain optimum operating conditions and ultimately reduce unnecessary downtime.
Grease is often used as a motor bearing lubricant because of its convenient application and unique properties. The main functions of motor bearing grease are:
● reduce friction and prevent wear
● Prevent bearing corrosion
● It acts as a seal to prevent the entry of contaminants
Grease is a semi-solid lubricant consisting of a base oil, a thickener and an additive. These components combine together under complex chemical reactions at controlled temperature and pressure. The base oil used in the grease may be mineral oil or synthetic oil. Mineral oils are available for most motor bearing applications. However, synthetic base oils are required for extreme temperature applications or for applications that require longer relubrication. The thickener is primarily used as a carrier for the base oil and prevents the base oil from leaking in the application. Some commonly used thickeners include metal soaps composed of calcium, lithium, sodium, aluminum or bismuth and composite metal soaps such as lithium complex soaps. A thickening agent widely used in motor bearing lubrication is polyurea.
As with many types of lubricants, additives are often used to improve grease performance. Commonly used additives include preservatives, antiwear and extreme pressure agents, antioxidants and etchants, pour point depressants, lubricants, dyes or pigments.