The document discusses different types of bearings, including plain/fluid film bearings, anti-friction/rolling contact bearings, and their characteristics. It describes hydrodynamic, hydrostatic, and combination bearings. It also explains ball bearings, roller bearings, tapered roller bearings, needle roller bearings, and their parts and applications.

1. Bearings
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2. Bearings
Anti Friction/
Rolling Contact
Bearings
Plain/ Fluid Film
Bearings
Hydro
Dynamic
Hydro Static Combination
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3. • The relative motions between the mating surfaces of a
plain bearing may take place in the following ways:
As pure sliding with any lubricating medium between the
moving surfaces.
With hydrodynamic lubrication where a film buildup of lubricating
medium is produced.
With hydrostatic lubrication where a lubricating medium is
introduced under pressure between the moving surfaces
With a combination of hydrodynamic and hydrostatic lubrication.
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4. Antifriction
bearings
Ball Bearing Roller
Bearings
Cylindrical
Roller
Bearings
Tapered
Roller
Bearings
Needle
Roller
Bearings
Minimize friction by
•Removing any possible sliding between
bearing surfaces
•Replacing all contacts with rolling
interfaces.
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5. Advantage Disadvantage
Quieter in
operation
High friction between mating surfaces result in
high power consumption.
Lower cost
More susceptible to damage from impurities in
lubrication system.
Require less
space
More susceptible to damage from impurities in
lubrication system.
Bearing
life is not limited by fatigue Have more stringent
lubrication requirements.
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6.  Inner ring or race which fits on the
shaft.
 Outer ring or race which fits inside
the housing.
 Ball and roller arranged between
the surfaces of two races. These
provide rolling action between the
races.
 the radius of the track for balls is slightly
greater 5 to 10 % than that of the ball
themselves.
 Note that the rotating surfaces rotate in
opposite directions.
 Cage which separates the balls or
rollers from one another.
The ball and roller bearing consists of
following parts:
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7. Single-Row Ball Bearing, Non-Filling Slot
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8. • It is a symmetrical unit capable of taking combined
radial and thrust loads.
• This type of bearing is not self-aligning
• Accurate alignment between shaft and housing
bore is required.
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10. Cylindrical Roller
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11. • Have solid or helically wound hollow cylindrical
rollers.
• The free ring may have a restraining flange to
provide some restraint to endwise movement in
one direction or maybe without a flange so that the
bearing rings may be displaced axially with respect
to each other.
• Can carry very large radial loads
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12. Tapered Roller
•They are held in accurate
alignment by a guide flange
on the inner ring.
•The shape of the roller is
tapered rather than straight
right cylindrical.
•This allows thrust loads to be
withstood in addition to the
radial loads.
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14. Needle Roller
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15. • Needle bearings are characterized by their relatively
small size rollers.
• The diameter of needle roller is usually less than ¼"
in diameter.
• The length of needle roller can range from 3 to 10
times of its diameter.
• The needle rollers are located directly between the
shaft and the outer bearing bore.
• This type of bearing is capable of high radial load
capacity.
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16. • Tapered roller bearing (TRB):
– used for gear boxes for heavy trucks, bevel-gear
transmission, lathe spindles, etc.
• Thrust ball bearing:
– It can take only thrust loads.
– Heavy axial loads and low speeds.
• Needle roller bearing:
– Used for radial load at slow speed and oscillating motion.
• Light weight and occupy small space.
• They are used in aircraft industry, live tail stock centers,
bench-drill spindles, etc.
APPLICATIONS OF ROLLER BEARINGS
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