TAPER ROLLER BEARING

2. TAPER ROLLER BEARING

4. TAPER ROLLER BEARING TAPER ROLLER BEARING MOUNTINGS 1. Face to face (direct) mounting 2. Back to back (indirect Mounting)

6. LUBRICATION OF ROLLER CONTACT BEARING • Objectives (Purpose) : • To reduce the friction and wear • To dissipate the frictional heat • To protect the highly finished surfaces from corrosion • To obstruct the entry of foreign matters like dust, dirt, water particles etc. • Guidelines for selection of lubricant: • Operating Temperature • Operating speed • Bearing Load • Lubrication system • Types of lubrication system • Grease Lubrication • Oil Lubrication

7. Grease Lubrication

8. Oil Lubrication

9. Bearing Failures – Causes and Remedies • Breakage of parts like races or cage • Surface destruction/ Wear (Abrasive, Corrosive, Pitting and scoring) Breakage of parts like races or cage • Retainer of spherical roller bearing • Breakage of partitions between pockets of pressed steel retainer • Retainer of angular contact ball bearing • Breakage of machined high tension brass casting retainer L1 • The cause is poor lubrication.

10. Damage to Reteiners • Retainer of tapered roller bearing • Breakage of pockets of pressed steel retainer

11. Flaking • Inner ring of deep groove ball bearing • Flaking on one side of the raceway surface • The cause is an excessive axial load. • Deep groove ball bearing • Inner ring, outer ring, and balls are flaked. • The cause is excessive load.

12. Peeling • Rollers of spherical roller bearing • Peeling on rolling contact surfaces • The cause is poor lubrication. • Tapered roller bearing • Development of peeling to flaking on inner ring and rollers • The cause is poor lubrication.

13. Wear • Inner ring of cylindrical roller bearing • Stepped wear on full circumference of raceway • The cause is poor lubrication. • Outer ring of cylindrical roller bearing • Stepped wear on raceway surface • The cause is poor lubrication.

14. Retainer of cylindrical roller bearing • Wear of pockets of machined high tensile brass casting retainer (G1)

15. Rust and Corrosion Outer ring of tapered roller bearing Rusting on raceway surface spacing equivalent to the distances between rollers. The cause is water in lubricant. Some points are corroded. • Inner ring of tapered roller bearing • Rusting on raceway surface spacing equivalent to the distance between rollers. The cause is water in lubricant.

16. Electrical Pitting • Inner ring of cylindrical roller bearing • Raceway surface is corrugated by electric pitting • Rollers of tapered roller bearings • Electric pitting at middle of rolling contact surfaces

17. Explanation of magnified photo 6 • Magnified (x400) pitting of roller shown in Photo 5 • Nital etchant develops a white layer on the cross section

18. Adhesive Wear

19. Inadequate Lubrication Cage Damage