part of lecture series on rolling contact bearing

2. Unit-4: Machine Design-II (RME-603)
Rolling Contact Bearing
By:
Dr. Ashish Gupta
(Associate Prof., Department of Mechanical Engineering)
GL Bajaj Institute of Technology and Management, Greater
Noida
Lecture-1

3. Topics to be covered
Introduction
Broad Classification
Advantages and disadvantages,
Terminology
Classification of rolling contact bearing

5. Broad Classification
• Sliding contact bearings
• Roller contact bearings (also known as
Anti-friction bearing)

6. The advantages of rolling bearings compared to journal bearings are:
1. Starting friction torque is about twice the running frictional
torque, but still it is negligible in comparison to starting friction
of a sleeve bearing (Sliding Bearing).
2.
3.
4.
5.
6.
7.
8.
Ease of lubrication either with grease or with relatively simple
systems.
Less axial space for a comparable shaft diameter.
Capable of supporting both radial and thrust loads.
Early warning of impending failure signaled by increasing
noisiness at the same speed of rotation.
Standardization and close tolerances make preferable their use
in precision machinery.
Easy to mount and erect.
Cleanliness.

7. The disadvantages of rolling bearings as compared to journal bearings
are:
1. Greater diametrical space required for a comparable shaft diameter.
2. Initial cost is usually higher.
3. Noisier in normal operation.
4. Finite life due to failure by fatigue.
5. Lesser capacity to withstand shock.

8. Terminnolgy

9. Classification of Roller contact
bearing
• Ball bearing (Radial and Thrust)
• Roller bearing (Radial and Thrust)
Figure (A) Figure (B)