8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

1/14

h-12 Lubrication and Journal Bearing 3/3/2

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

MECH 412 2Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

2/14

h-12 Lubrication and Journal Bearing 3/3/2

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.

MECH 412 3Dr. A-H. I. Mourad

12-1 Types of Lubrication

Five distinct forms of lubrication may be identified:

1. Hydrodynamic

2. Hydrostatic

3. Elastohydrodynamic

4. Boundary5. Solid film

MECH 412 4Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

3/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 5Dr. A-H. I. Mourad

MECH 412 6Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

4/14

h-12 Lubrication and Journal Bearing 3/3/2

Sommerfeld Number

MECH 412 7Dr. A-H. I. Mourad

12-4 Stable Lubrication

MECH 412 8Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

5/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 9Dr. A-H. I. Mourad

MECH 412 10Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

6/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 11Dr. A-H. I. Mourad

MECH 412 12Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

7/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 13Dr. A-H. I. Mourad

MECH 412 14Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

8/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 15Dr. A-H. I. Mourad

MECH 412 16Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

9/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 17Dr. A-H. I. Mourad

MECH 412 18Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

10/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 19Dr. A-H. I. Mourad

MECH 412 20Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

11/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 21Dr. A-H. I. Mourad

MECH 412 22Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

12/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 23Dr. A-H. I. Mourad

MECH 412 24Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

13/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 25Dr. A-H. I. Mourad

MECH 412 26Dr. A-H. I. Mourad

8/12/2019 Lubrication and Journal Bearings-Ch12-Student Version

14/14

h-12 Lubrication and Journal Bearing 3/3/2

MECH 412 27Dr. A-H. I. Mourad

MECH 412 28Dr. A-H. I. Mourad