bearings

Topics: Ball bearing, Bearing, Thrust bearing Pages: 13 (1458 words) Published: August 17, 2014
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 element.
– Friction is Rolling in nature.

Sliding Contact Bearing

Rolling Contact Bearing

5

Application
Sr.
No.

Sliding Contact Bearing

1

Crankshaft bearing in petrol Automobile Front and rear axel
and diesel engines.

2

Centrifugal pumps

Machine tool spindles

3

Large size electric motors

Small size electric motor

4

Steam and gas turbine

Gear Boxes

5

Concrete
conveyor
installation

mixer,
and

Rolling Contact Bearing

rope crane hook, hoisting drum
marine
6

Rolling Contact Bearing
• In rolling contact bearings, the contact between the bearing surfaces is rolling instead of sliding as in sliding contact bearings.
• It is an outstanding advantage of a rolling contact bearing over a sliding bearing that it has a low starting friction.
• Due to this low friction offered by rolling contact bearings, these are called antifriction bearings.


Rolling contact bearing consists of four parts:
– Inner race : It is mounted on the shaft and rotate with it. – outer race : It rests on frame and generally stationary. – Rolling element like ball : permits the motion between inner & outer race. – Roller or needle

– Cage which holds the rolling element together and space them evenly around the periphery of the shaft.

Ordinary sliding bearing starts from rest with practically metal-to-metal contact and has a high coefficient of friction

7

Major Parts of Rolling
Contact Bearing



Outer / Inner race



Rolling element like : Ball, Roller or Needle.



Cage which holds the rolling elements together
with equal space.

8

Types of Rolling Contact Bearing
1. Ball Bearing
2. Roller Bearing

9

Ball Bearing
• The ball and roller bearings consist of an inner race which is mounted on the shaft or journal and an outer race which is
carried by the housing or casing.
• In between the inner and outer race, there are balls or rollers. A number of balls or rollers are used as a...
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