Bearings. Bearings Anti-Friction Anti-Friction Rolling Element Bearings Friction Friction Plain Bearings While all bearings are intended to reduce friction.

BearingsBearings

BearingsBearings

Anti-FrictionAnti-Friction

Rolling Element BearingsRolling Element Bearings FrictionFriction

Plain BearingsPlain Bearings

While all bearings are intended to reduce friction they are generally categorized as either:

BearingsBearings

The primary purpose of a Bearing is The primary purpose of a Bearing is to carry a load in either one of two to carry a load in either one of two directions:directions:

BearingsBearings

Some Bearings are subjected to a Some Bearings are subjected to a combination of the two directions:combination of the two directions:

BearingsBearings

Plain Bearings Plain Bearings TypesTypes

BushesBushes

Headed BushesHeaded Bushes

BearingsBearings

Plain Bearings Plain Bearings TypesTypes

SleeveSleeveLow Friction Lining Low Friction Lining attached to a steel, attached to a steel, cast iron or bronze cast iron or bronze back or shellback or shell

Split Sleeve, PrecisionSplit Sleeve, PrecisionInsert or SlipperInsert or Slipper

BearingsBearings

Plain Thrust Plain Thrust BearingsBearings

Step or PivotStep or Pivot

Collar ThrustCollar Thrust

Tilting PadTilting Pad

BearingsBearings

Advantages of Plain BearingsAdvantages of Plain BearingsFor Dynamic Applications:For Dynamic Applications:

The housings for plain bearings can be of smaller The housings for plain bearings can be of smaller diameterdiameter

Any possible centrifugal problems connected Any possible centrifugal problems connected with ball and rollers can be eliminatedwith ball and rollers can be eliminated

BearingsBearings

Advantages of Plain BearingsAdvantages of Plain BearingsIf assembly is difficult:If assembly is difficult:

Plain bearings may be designed in two (2) halves Plain bearings may be designed in two (2) halves and bolted together, to permit insertion of the and bolted together, to permit insertion of the shaftshaft

BearingsBearings

Advantages of Plain BearingsAdvantages of Plain BearingsTo Withstand Shock Loads:To Withstand Shock Loads:

Plain bearings have a resilient oil film so that Plain bearings have a resilient oil film so that they are not sensitive to wide clearancesthey are not sensitive to wide clearances

Plain bearings are not prone to “bump” Plain bearings are not prone to “bump”

Plain bearings are silent in operationPlain bearings are silent in operation

BearingsBearings

Advantages of Plain BearingsAdvantages of Plain BearingsFor Heavy Duty Loads:For Heavy Duty Loads:

Plain bearings have a high thermal conductivityPlain bearings have a high thermal conductivity

Plain bearings permit controlled distribution of Plain bearings permit controlled distribution of oil under pressure for oil under pressure for lubricationlubrication and and coolingcooling

BearingsBearings

Advantages of Plain BearingsAdvantages of Plain BearingsLong Life Free From Breakdown :Long Life Free From Breakdown :

Plain bearings are not sensitive to Plain bearings are not sensitive to Corrosion by dampCorrosion by dampFatigueFatigueBreakage of balls and rollers by Breakage of balls and rollers by

high local high local pressures due to entry pressures due to entry of gritof grit

Bearings

There are five basic types of anti-friction bearings:

Tapered

Needle

Ball

Spherical

CylindricalEach is named for the type of rolling element it employs.