1. Bearing Types ppt

Bearing Bea ring Types Types

History of Inventions of Rolling Element Bearings

Primary Function of Bearings •

Transmit loads

•

Reduce Friction

•

Secondary roles  – 

Support the shaft

 – 

Locate the shaft

Bearing Loads

How did a bearing evolve ? * Invention of wheel * Wheel rotates on axle * Wear Plate + Rollers * Inner ring + Outer ring + Rollers * With introduction of cage Rolling Bearing was created

Roller and Ball Raceway Contact

Types of Rolling Elements Ball

Spherical roller (symmetrical)

Spherical roller (asymmetrical)

Taper roller

Cylindrical roller Needle roller

Bearing Components (Deep Groove Ball Bearing)

Seal

Rolling Elements Outer ring

Inner Ring Cage

Seal

Characteristics Ball bearings Deep groove ball bearing

Angular contact ball bearing

Point Contact :

Self-aligning ball bearing

* * * * Roller bearings Cylindrical roller  bearing

Taper  Needle roller  roller  bearing bearing

Spherical roller bearing

Less area of contact Less friction More speed Less load

Line Contact : * * * *

More area of contact More friction Less speed More load

Bearing Loads

Radial rolling bearings Ball bearings Deep groove ball bearing

Angular Self-aligning contact ball bearing ball bearing

Roller bearings Cylindrical roller  bearing

Taper  Needle roller  roller  bearing bearing

Spherical roller bearing

Thrust bearings Ball bearings Thrust ball bearing

Angular Contact Ball Thrust bearing

Roller bearings Taper Roller Thrust bearing

Spherical Roller Thrust bearing

Cylindrical / Needle Roller Thrust bearing

Bearing Terminology

Bore surface O.D. Bore

O.D. surface

Bearing Terminology Outer ring raceway Outer ring land Side faces

Inner ring land

Inner ring raceway

Ball and Roller Bearing Ranges Ball bearings Deep groove

Angular contact

Self-aligning

+

Roller bearings

Cylindrical

Taper

Needle

Spherical

Load Capabilities

Load carrying capacity is expressed as the basic dynamic load rating

Relative Speed Limitations r/min

Oil lubrication speed rating

Grease lubrication speed rating

Bearing Contact Angle

Single Row

Cylindrical Roller

Radial Loads

Angular Contact

Taper Roller

Spherical Roller

Combined Loads

Bearing Components Cage

Outer Ring

Rolling Element

Inner Ring

Closures: Shields

 Non-Contact Seal

RZ

Land Riding Lip Seal

RS1

Rolling Bearings are Precision Products How much is a ?

Normal

Standard

0/-15 m

Precision bearing

P6

0/-12 m

A human hair

High precision bearing

P6 SP

P4A UP

0/-9 m

0/-7 m

1 PA9A PA9B

0/-2,5 m

Tolerance classes

0,06 mm

Precision Classes Precision classes: US vis-a-vis Europe ABEC

 – 

 – 

ISO

1

Normal

3

P6

5

P5

7

P4

9 P9 Generally, use bearings no more than one precision class better than the precision of the mating components Extra precision has no benefit if applied to poorly made mating components

Internal Clearances Radial clearance

Axial clearance

Bearing Basics C1 - Less than C2 clearance C2 - less than normal clearance (CN, C0) normal clearance (not generally marked) C3 - greater than normal clearance (“standard”) C4 - greater than C3 clearance C5 - greater than C4 clearance Example: A 6210 /C3 Ball bearing has from 18 - 36 µm (microns) or 0.0007” - 0.0014” Radial Internal Clearance