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1. AMRUTVAHINI COLLEGE OF ENGINEERING, SANGAMNER
DESIGN OF TRANSMISSION SYSTEM
“MOUNTING OF BEARINGS”
PRESENTED BY,
NAME ROLL NO. SEAT NO.
KADAM AJAY YADAV 3147 T190100857
JANGID BHAGIRATH DEVKARAN 3146 T190100856
JADHAV SUNIL BHAUSAHEB 3145 T190100851
GUNJAL PRASAD LAHANBHAU 3138 T190100843
GUNJAL TEJAS VILAS 3137 -
KARPE KANCAHN KISHOR 3154 -
UNDER THE GUIDANCE OF,​
PROF.A.V.DEOKAR

2. • Bearing is a mechanical element that permits relative motion between two
parts, such as the shaft and the housing, with minimum friction.
• The functions of the bearing are as follows:
(i) The bearing ensures free rotation of the shaft or the axle with minimum
friction.
(ii) The bearing supports the shaft or the axle and holds it in the correct
position.
(iii) The bearing takes up the forces that act on the shaft or the axle and
transmits them to the frame or the foundation.
Bearing

3. • Depending upon the direction of force that acts on them, bearings are classified
into two categories,
1. radial bearings
2. thrust bearings
- A radial bearing supports the load, which is perpendicular to the axis of the
shaft
- A thrust bearing supports the load, which acts along the axis of the shaft

4. • Depending upon the type of friction, bearings are classified into
two main groups—
1. sliding contact bearings :
In this the surface of the shaft slides over the surface of
the bush resulting in friction and wear
2 . rolling contact bearings:
In this type , Rolling elements, such as balls or rollers,
are introduced between the surfaces that are in relative motion.
In this type of bearing, sliding friction is replaced by rolling friction.

5. Types of rolling contact bearings
• Deep groove : the radius of the ball is slightly less than the
radii of curvature of the grooves in the races.
• Cylindrical roller : point contact in ball bearing is replaced
by the line contact of roller bearing for maximum load
carrying capacity
• Angular contact : line of reaction at the contact between
balls and races makes an angle with the axis of the
bearing
• Self aligning : this consists of two rows of balls, which roll
on a common spherical surface in the outer race

6. • Taper roller : The taper roller bearing consists
of rolling elements in the form of a frustum
of cone.
• Thrust ball bearing : this consists of a row of
balls running between two rings,
the shaft ring and the housing ring

7. MOUNTING OF BEARING
• The inner race of the bearing is fitted on the shaft by means of an interference fit
• It prevents the relative rotation and the corresponding wear between the inner
race and the shaft.
• Care should be taken to select the fit in such a way that it provides sufficient
tightness
• Insufficient tightness of the outer race in the housing seat may cause ‘creep’
• creep is slow rotation of the outer race ,caused when the shaft is subjected to
external force that rotates and changes its direction

8. • The bearing is press fitted on the adapter
sleeve
• A washer and lock nut is provided to restrict
the displacement of the inner race to the right
side

9. • The shaft is provided with a shoulder to restrict
the displacement of the inner race to the
left side
• The displacement of the race to the right side is
restricted by a plate, which is bolted to the shaft.

10. • In ( c ) a snap-ring is used in place of
the plate.
• A circular ring of the cover plate
restricts the displacement to the
right side
• The cover plate is bolted to the housing
• oil seal unit is used to prevent the
leakage of lubricating oil

11. • It is necessary to position inner and outer races axially
by methods like:
- providing shoulders for the shaft or the housing
- lock nut
- snap ring or cover plates

12. The precautions to be taken during the mounting
operation are:
• Mounting should be carried out in a dust free and dry environment
• Before assembly, the shaft and the housing bore should be inspected.
• The burrs on the shaft and the shoulders should be removed.
• The bearing should not be taken out from its package until before it is assembled
• Direct blows should never be applied to the bearing surface, it can
cause damage.
• The bearing should never be heated by direct flame

13. Preloading of cylindrical roller bearing is obtained by
the following methods:
1.The roller bearing is mounted on a taper shaft or sleeve, which causes the
inner race to expand and remove the radial clearance.
2.The outer race is fitted in the housing bore by an interference fit. It causes
the outer race to contract and remove the radial clearance