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The lubrication of rolling bearings – similar to that of sliding bearings – mainly serves one purpose: to avoid or at least reduce metal-to-metal contact between the rolling and sliding contact surfaces, i.e. to reduce friction and wear in the bearing. Oil, adhering to the surfaces of the parts in rolling contact, is fed between the contact areas. The oil film separates the contact surfaces preventing metal-to-metal contact (»physical lubrication«). | Rolling Bearing Lubrication Rolling Bearings FAG OEM und Handel AG Publ. No. WL 81 115 4 EA Rolling Bearing Lubrication Publ. No. WL 81 115 4 EA FAG OEM und Handel AG A company of the FAG Kugelfischer Group P.O. Box 1260 D-97 419 Schweinfurt Phone 0 97 21 91 2349 Telefax 0 97 21 91 4327 http www.fag.de Table of Contents 1 Lubricant in Rolling Bearings 3 5 Damage Due to Imperfect Lubrication 52 1.1 Functions of the Lubricant in Rolling Bearings 3 5.1 Contaminants in the Lubricant 52 1.1.1 The Different Lubricating Conditions in Rolling Bearings 3 5.1.1 5.1.2 Solid Foreign Particles How to Reduce the Concentration of Foreign 54 1.1.2 Lubricating Film with Oil Lubrication 4 Particles 54 1.1.3 Influence of the Lubricating Film and Cleanliness 5.1.3 Oil Filters 54 on the Attainable Bearing Life 6 5.1.4 Liquid Contaminants 55 1.1.4 Lubricating Film with Grease Lubrication 12 5.2 Cleaning Contaminated Rolling Bearings 55 1.1.5 Lubricant Layers with Dry Lubrication 13 5.3 Prevention and Diagnosis of Incipient Bearing 1.2 1.3 2 2.1 2.2 2.3 2.4 2.5 2.5.1 2.5.2 2.5.3 2.5.4 2.5.5 3. 3.1 3.1.1 3.1.2 3.1.3 3.2 3.2.1 3.2.2 3.2.3 3.3 3.4 4 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.2 4.2.1 4.2.2 4.2.3 4.2.4 4.2.5 4.3 Calculation of the Frictional Moment Operating Temperature Lubrication System Grease Lubrication Oil Lubrication Dry Lubrication Selection of Lubrication System Examples of the Different Lubrication Systems Central Lubricating System Oil Circulation System Oil Mist Lubrication System Oil-Air Lubrication System Oil and Grease Spray Lubrication Lubricant Selection Selection of Suitable Greases Grease Stressing by Load and Speed Running Properties Special Operating Conditions and Environmental Influences Selection of Suitable Oils Recommended Oil Viscosity Oil Selection According to Operating Conditions Oil Selection According to Oil Properties Selection of Dry Lubricants Quickly Biodegradable Lubricants Lubricant Supply Grease Supply Lubricating Equipment Initial Grease
