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United Arab Emirates University
College of Engineering
Department of Mechanical Engineering
Machine Design 2
MECH 412
Chapter 12
Lubrication and Journal Bearings
Prepared by
Dr. Abdel-Hamid I. MouradMechanical Engineering Department
UAE University
MECH 412 1Dr. A-H. I. Mourad
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The object of lubrication is to
A lubricant is.
In a sleeve bearing, a shaft, orjournal, rotates or oscillates within a
sleeve, or bushing, and the relative motion is .
In an antifriction bearing, the main relative motion is..
Gear teeth mate with each other by a combination of and.
The field of application for journal bearings is immense.
The crankshaft and connecting-rod bearings of an automotive
engine
The journal bearings used in the steam turbines of power-generating
stations .
At the other extreme there are thousands of applications in which theloads are light and the service relatively unimportant; a simple, easily
installed bearing is required, using little or no lubrication.
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12-1 Types of Lubrication
Five distinct forms of lubrication may be identified:
1. Hydrodynamic
2. Hydrostatic
3. Elastohydrodynamic
4. Boundary5. Solid film
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Sommerfeld Number
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12-4 Stable Lubrication
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