HELLO
FRIENDS,
Previous article we have discuss parts of cylinder block,
cylinder head and this article we have discuss crankcase and cylinder liner and piston introduction.
So…..lets start,😊
3. Crankcase:
Crankcase is attached to the bottom face of the cylinder
block. Crankcase is base on the engine. It is supported the crankshaft and
camshaft in suitable bearings and provided the arm for supporting the engine on
the frame. The oil pan and the lower part of cylinder block together are called
the crankcase.
Sometimes you are thinking about oil pan, so I can
explain this oil pan is bottom half of the crankcase is called oil pan show in figure.
it is bolted or screwed to the lower flange of the main casting are usually made
of pressed steel and aluminum.
In the crankcase
cylinder block and upper half of the crankcase usually are cast as single
integral unit. This casting is usually made of a ferrous alloy or semi-steel
provide to stronger and harder casting. 4. Cylinder Liners:
Problem of cylinder were and this has been solved by use
of cylinder liner. The cylinder liner
are in the form of barrels made of special alloy iron containing
silicon, manganese, nickel and chromium. It is now fit cylinder liner on engine
for cars and commercial vehicles. The cylinder liner are used of cooling in
cylinder. There are two types dry liner and wet liner are as show in the
figure.
►Dry liner: A
dry liner is made in the shape of a barrel having a flange at the top which
keeps it into position in the cylinder block. Outer surface of dry liner bear against
the cylinder block. It’s not a direct contact with cooling water and hence is
khown as dry liner. Thikness range is 1.5mm to 3mm.
5.
Piston:
Piston is considered to
be the most important parts of reciprocating and rotary engine. Which its help
to convert the chemical energy to mechanical energy. The purpose of the piston
is the expansion of the gases to crankshaft, via the connecting rod, without
loss of gas from the top dead centre to bottom dead center. Previous article “two
stroke engine” discuss in how to work of piston on suction stroke to compression
stroke. In the piston construction are equipped with piston rings to provide a
good seal between the cylinder wall and piston. The efficiency and economy of
the engine primarily depends on the working of piston. In the cylinder very
high temperature ranging from 2000ºC
to
over 2800 ºC during
this operation.
►
Piston must be the following qualities:
1. Rigidly to high pressure
2. Lightness weight
3. Good heat conductivity
4. Material low expansion. For different
Expansion rate of cast iron cylinder block and aluminum piston.
The top of the piston is called
head. Ring
grooves are cut on the Circumference of the
upperp portionof the piston. The part of the
ring grooves is skirts. The portions of piston
thats separatedthe grooves are called lands.
Some piston have groove in the top land is
called a heatd Dam which is reduce heat
transfer to the rings. The piston bosses are
the reinforce section of the piston design to
hold the piston pin or wrist pin.
grooves are cut on the Circumference of the
upperp portionof the piston. The part of the
ring grooves is skirts. The portions of piston
thats separatedthe grooves are called lands.
Some piston have groove in the top land is
called a heatd Dam which is reduce heat
transfer to the rings. The piston bosses are
the reinforce section of the piston design to
hold the piston pin or wrist pin.
in piston cylinder some details are show on the.... next aritical never miss....
Thank you🤗
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