This document discusses bearings and their lubrication. It classifies bearings into radial bearings and thrust bearings. It also describes different types of journal bearings including full, partial, and fitted journal bearings. The document notes that lubrication reduces friction and prevents wear, corrosion, and contamination in bearings. While a properly lubricated bearing could theoretically last forever under ideal conditions, in reality properly lubricated bearings have the best chance of reaching their maximum service life.

1. UNIT-5
BEARINGS

2. INTRODUCTION

3. Classification

4. Radial Bearing

5. Thrust Bearing

7. Types of Journal Bearing

8. Full Journal Bearing

9. Partial Journal Bearing

10. Fitted Journal Bearing

11. Types of Lubrication

13. BEARING LUBRICATION
Lubrication reduces friction. It also prevents wear and corrosion,
and guards against
solid and liquid contamination. Theoretically, a properly
lubricated bearing operating
under ideal conditions will last forever. This is not possible in
reality, of course. But a
properly lubricated bearing has the best chance of achieving its
maximum service life.