a LUBRICATION ShgyrrttrrrYSTEM-PDF.pdf

Lubrication System

1. SATHEESAN M.P.
LECTURER IN MECHANICAL ENGINEERING
S.N.P.T.C. KANHANGAD
SEMESTER-4
MECHANICAL ENGINEERING
Subject-AUTOMOBILE ENGINEERING
UNIT-1 LUBRICATION SYSTEM

3. •Alubricantisasubstance,usuallyorganic,
introducedtoreducefrictionbetweensurfacesin
mutualcontact,whichultimatelyreducesthe
heatgeneratedwhenthesurfacesmove.
•Thejobofthelubricationsystemistodistribute
oiltothemovingpartstoreducefriction
betweensurfaceswhichrubagainsteachother.
•OilReducesFrictionbycreatingathin
film(Clearance)betweenmovingparts.
•Theoilhelpsformasealbetweenpistonrings
andcylinderwalls
•Itmayalsohavethefunctionoftransporting
foreignparticles,orcoolingthesurfaces.

4. •LubricationSystemCleansAsitcirculatesthrough
theengine,theoilpicksupmetalparticlesand
carbon,andbringsthembackdowntothepan.
•Picksupheatwhenmovingthroughtheengine
andthendropsintothecooleroilpan,givingup
someoftheheat.
•AbsorbsshockWhenheavyloadsareimposedon
thebearings,theoilhelpstocushiontheload.
•Theadditivesinoilhelpsinabsorbingthe
contaminantsthatenterthelubricationsystem.

6. LUBRICATION SYSTEM
1.PETROIL LUBRICATION
2.SPLASH LUBRICATION SYSTEM
3.PRESSURISED LUBRICATION SYTEM

7. PetroilLubrication
Thissystemoflubricationisgenerallyadopted
intwostrokepetrolengines,likescootersand
motorcycles....Whenthefuelgoesintothe
crankchamberduringtheengineoperation,
theoilparticlesgodeepintothebearing
surfacesandlubricatethem.

8. PetroilLubrication System:
•This system is generally used in the two-stroke petrol
engines like scooters, motorcycles.
•In this type of system, a certain amount of oil is mixed
with petrol itself. therefore 3 to 6% of oil mixed with
fuel.
•This proportion should be proper. If this proportion is
less, the danger of oil starvation causes damage to the
engine.
•If this proportion is more, the engine gives dark smoke
and excessive carbon deposits on the cylinder head.

9. SPLASH LUBRICATION SYSTEM

10. Splash Lubrication System
•This is the most popular type of lubrication system duly
used in cars extra.
•This is one of the cheapest methods of the lubrication
system.
•It consists of a scoop, which is fitted at the lower end
of the connecting rod as shown in the diagram.
•As when the engine runs scoop splashes, the oil from
oil through by centrifugal force to all engine parts.

11. Splash Lubrication System
•Inthissystem,thecapofthebigendbearing
ontheconnectingrodisprovidedwitha
scoopwhichstrikesanddipsintotheoil-filled
throughateveryrevolutionofthecrankshaft
andoilissplashedallovertheinteriorof
crankcaseintothepistonandcoverthe
exposedportionofthecylinderisshownin
thefigurebelow.

12. SPLASH LUBRICATION SYSTEM

13. PRESSURISED LUBRICATION SYTEM

15. PRESSURISED LUBRICATION SYTEM
•Thissystemisused,becausethesplashsystemis
notsufficientforlargerengineslikeAmbassador,
Jeep,AshokLeyland,andothers.
•Oilfromthesumpwillbesuppliedtotheengine
partsthroughmaingalleries,viastrainerand
filter.
•Thepressureofoilisabout2to4kg/cm2.
•Forcamshaftandtiminggears,oilissuppliedbya
separatelinethroughthepressurereducing
valves.

16. •Inthissystem,theoilisdeliveredfromthesump
strainertodifferentengineparts.
•Inthissystem,thepressureofoilisabout4to
5kg/cm2.
•Afterlubricationoilisdrawnbacktotheoilsump.
•Inthiscase,theoilisalwayspresentinthesump.
•Hencecalledawetsumplubricationsystem.