bearings

Bearings
• Definition:
– Bearing is a machine element which support another moving machine element called as Journal.
– A bearing is a mechanical element that permits relative motion between two parts, such as shaft and housing.

•

Function:
– Ensures free rotation of shaft or axel with minimum friction.
– Supports shaft or axel and holds it in correct position.
– Takes up the forces that acts on the shaft or axel and transmit them to the foundation.

1

Classification of Bearing
Bearing

Depending Upon
Type of Friction

Depending Upon
Direction of Force
Radial Bearing

Rolling Contact
Bearing
OR
Antifriction
Bearing

Sliding Contact Bearing OR
Journal Bearing OR
Sleeve Bearing OR
Plain Bearing

Thrust Bearing

Single Row Deep Groove
Ball Bearing
Double Row Deep Groove
Ball Bearing

Ball Bearing
Roller Bearing

Angular Contact Bearing
Self-aligning Bearing

Cylindrical

Spherical

Tapered

Needle
Filling Notch Bearing

2

Classification of Bearing
• Bearings are classified in different ways
A. Depending upon direction of Force.
1. Radial Bearing.
2. Thrust Bearing .
B. Depending upon type of Friction.
1. Rolling Contact Bearing OR Ball Bearing OR
Antifriction Bearing.
2. Sliding Contact Bearing OR Plain Bearing OR Journal
Bearing OR Sleeve Bearing.

3

General Description
• Radial Bearing:
– Supports the load which is perpendicular to the axis of rotation.

• Thrust Bearing:
– Supports the load which acts along the axis of shaft. Radial Bearing

Thrust Bearing

4

General Description
•

•

Sliding Contact Bearing OR Plain Bearing OR Journal
Bearing OR Sleeve Bearing.
– Sliding takes place between surface of contact between moving and fixed element.
– Sliding results in friction and wear.
– To avoid friction, lubricating oil is used.
Rolling Contact Bearing OR Ball Bearing OR
Antifriction Bearing.
– Steel balls or rollers are introduced between moving and fixed