summer training report on NBC for B.TECH students

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2.  Introduction
 Types of bearings
 Tapper roller Bearings
 Construction
 Classification
 Setting Techniques
 Features
 Applications
 Advantages

3.  Objective of bearing is to provide relative
positioning and rotational freedom while
transmitting a load between two parts.
 It needs a good ssuuppppoorrtt to ensure ssttaabbiilliittyy
and frictionless rotation.
 The ssuuppppoorrtt for the shaft is known as
“bearing”.

4.  Ball Bearing
 Taper Roller Bearing
 Cylindrical Roller Bearing
 Railway Bearing
 Large Diameter Bearing

5.  Tapered roller bearings are bearings that can take
large axial forces as well as being able to sustain large
radial forces.
 Tapered roller bearings are based on the observation
that cones that meet at a point can roll over each other
without slipping.
Tapered Roller bearings are generally separable, which
means the cone assembly, consisting of the inner ring
with roller and cage

6. The Taper Roller bearings are
composed of four elements.
i.Outer race
ii.Inner race
iii.Rolling element
iv.Cage of retaining ring

7. Taper Roller bearing
With its parts
i.Outer ring
ii.Inner ring
iii.Rolling elements
iv.Cage

8. Single Row TRB
Double Row TRB
 Four Row TRB
 Tapered Row TRB

9.  Tapered roller bearings can take both axial
and radial loads.
 The axial load carrying capacity of the
bearings is largely determined by the contact
angle α .
A single row tapered roller bearing can be
located endwise in one direction.

11.  In Double Row Tapered Roller bearings,
NBC provides both back-to-back arrangement
and face-to-face arrangement.
 These are adjusted to fix the clearance
values of each type.
Only parts with identical manufacturing
numbers can be used.

13.  Four Row Tapered roller bearings are made
up of two double row inner rings and two double
row outer rings.
 These bearings are used for heavy load
capacity as in the roller necks of rolling mills.
The life of large bearings is extended by using
case hardened steel, hollow rollers and pin-type
cages.

15.  NBC Tapered Roller Thrust bearings include
rollers that have conical sections.
 These bearings are designed primarily to
support axial loads at contact angles between 30˚
and 90˚.
 These bearing are suited for applications where
extremely high thrust loads like in crane hooks,
coal pulverizes etc.

17. Production-line assembly workers often set bearings
manually for equipment that is manufactured in low-to
moderate volume, and where a non-exact and wider-than -
normal range of end play is acceptable.
 No special tools, gages, charts, or fixtures are typically
required. In a truck no driven wheel, for example, manual
setting consists of tightening an adjusting nut on the end of the
shaft while rotating the wheel until a slight bind is felt.
Then the assembler backs off the nut 1/6 to 1/4 turn to the
nearest locking hole or enough to let the wheel rotate freely.
The adjusting nut is then locked in position

18.  High quality through hardened bearing
steel
 Optimized, engineered internal
geometry
 Highly consistent, reliable, and flexible
manufacturing
 Globally interchangeable inch and
metric designs
 Available integrated seal

19.  Heavy duty applications.
 Agriculture.
 Construction.
 Mining equipment.
 Axle systems.
 Gear box.
 Engine motors.
 Reducers.

20.  Dimensional Stability.
 Long Life Even In Contaminated
Lubricant.
 Durable Steel Cage.
 Dimensionally Interchangeable
With Other Bearing Manufacturers