# COOLING SYSTEM OF IC ENGINE. PDF
Download PDF ↓
COOLING SYSTEM
Polytechnic 3rd semester
Download Thermal engineering notes↓
click here
DOWNLOAD NOW
LUBRICATION SYSTEM
INTRODUCTION:-
As we know that lubrication is a process of flowing &
covering the mating surfaces which are in relative motion
with each other.
In an I.C.E all most all engine parts have relative motion due
to which the component gets rubbed against each other.
This rubbing action will damage the parts or components
after some time.
Thus it become very much necessary to lubricate the parts/
components to increase there service life.
MAIN OBJECTIVE :-
It reduce the friction between mating parts & reduce there wear
& tear . An oil film is formed between the mating parts which
prevents them from coming in direct contact with each other.
It reduces the power consumption inorder to drive the
component.
It acts as a cooling mediumfor removing the heat.
It acts as cleaning agent by preventing the carbon deposition
over the surface of component & carry away harmful substance
that result due to incomplete combustion.
It acts as a sealing agent & provides a good seal between piston
rings & cylinder wall.
PETROIL LUBRICATION SYSTEM
This is the simplest type of lubrication system. This
method of lubrication is used in small engines like
engine of scooters & motorcycle.
In this method of lubrication the lubricating oil is
mixed with petrol & fed into the engine cylinder
during suction stroke.
About 3-6% of lubricating oil is added with petrol in
petrol tank. When engine starts working the crank
compresses the fuel in crank case due to which the
gasoline evaporates & moves upward in combustion
chamber while the lubricating oil left behind in form
of mist(fog).
The parts of engine such as piston, cylinder wall &
connecting rod are lubricated by this mist.
ADVANTAGES:-
1. It is simple in construction as no external system is
required for lubrication.
2. Low cost.
3. No maintainance cost is required for lubrication system.
4. Causes less engine weight.
Disadvantages:-
1. If lubricating oil added is less ,there will be in sufficient
lubrication & causes seizure of piston.
2. If lubricating oil is added more, it will produces large
smoke.
3. It creates Problem in engine staring.
WET SUMP LUBRICATION SYSTEM
These system employs a large capacity oil sump at the
base of or bottom of crank chamber & it from this sump
the lubricating oil is drawn by a low pressure pump & is
forced to various engine parts.
The oil after circulating to different parts return back to
the sump.
In this type of lubrication system the sump is always filled
with the lubricating oil hence it is called as wet sump
lubrication system.
Wet sump lubrication system is of three types:-
1. Splash lubrication system.
2. Semi pressurized lubrication system.
3. Full pressurized lubrication system.
