Ship engine components and functions #mainengine #2strokeengine
Summary
TLDRThis educational video script discusses the workings of a two-stroke diesel engine, highlighting its use for ship propulsion. It explains the interconnected components, starting from the rocker arm operated by the camshaft to control the exhaust valve, to the cylinder liner where the piston moves. The script details the cooling jacket, ports for scavenging, and the piston's connection to the crankshaft via the connecting rod and crank pin. It also touches on the turbocharger's role in supplying fresh air and the exhaust gas reuse, concluding with the engine's bed plate and cylinder block, providing a comprehensive overview of the engine's critical parts.
Takeaways
- 🚢 Two-stroke diesel engines are primarily used for ship propulsion, driving the propeller via the tail shaft, intermediate shaft, and crankshaft.
- 🔧 The rocker arm is a crucial component that operates the exhaust valve, controlled by the push rod which in turn is operated by the camshaft.
- ⚙️ The camshaft is connected to the engine's crankshaft, ensuring synchronized operation through chain drive or gear mechanisms.
- 🔥 The cylinder liner is where the piston moves, generating heat that is managed by a water jacket for cooling purposes.
- 💧 The jacket is filled with freshwater from a freshwater generator to cool the cylinder liner, maintaining engine temperature.
- 🔄 Ports in the cylinder liner allow for scavenging, the process of fresh air intake necessary for combustion within the engine.
- 🔩 The piston is connected to the piston rod, which then connects to the connecting rod (con rod) through a crosshead bearing, ensuring vertical movement.
- ⚙️ The crankshaft, or main engine shaft, has a crank pin to which the connecting rod attaches, converting linear motion to rotational.
- 🌀 The turbocharger's role is to supply fresh air to the scavenger space for combustion, driven by the exhaust gas from the engine.
- 🏗 The bed plate and A-frame are structural components that support the engine, with the cylinder block mounted on the A-frame.
Q & A
What is the primary use of a two-stroke engine on a ship?
-The primary use of a two-stroke engine on a ship is for propulsion purposes. It is used to rotate the propeller of the ship.
How is the propeller connected to the engine in a two-stroke diesel engine setup?
-The propeller is connected to the tail shaft, which is in connection with the intermediate shaft and the crankshaft of the main engine.
What is the function of the rocker arm in a two-stroke engine?
-The rocker arm is used to operate the exhaust valve in a two-stroke engine.
How is the camshaft related to the crankshaft in a two-stroke engine?
-The camshaft is internally connected with the crankshaft of the engine by a chain drive or gear mechanism.
What is the role of the cylinder liner in a two-stroke engine?
-The cylinder liner is the cylindrical shape in which the piston moves up and down.
What is the purpose of the jacket in the cylinder liner?
-The jacket is used for cooling the cylinder. It is filled with water for cooling purposes.
What are the ports in the cylinder liner used for?
-The ports are used for scavenging purposes, allowing fresh air to enter the cylinder for combustion.
How does the piston rod connect to the connecting rod in a two-stroke engine?
-The piston rod connects to the connecting rod through the crosshead bearing.
What is the function of the crankshaft in a diesel engine?
-The crankshaft is the main shaft of the diesel engine, to which the connecting rod is connected.
What is the purpose of the turbocharger in a two-stroke diesel engine?
-The turbocharger is used to supply fresh air into the scavenger space for combustion purposes.
What is the function of the relief crankcase door in a two-stroke engine?
-The relief crankcase door is used to release excess pressure from the crankcase.
Outlines
🚢 Understanding Two-Stroke Diesel Engines in Ships
This paragraph introduces the two-stroke diesel engine used primarily for propulsion in ships. It explains how the propeller is driven by the engine via the tail shaft, intermediate shaft, and crankshaft. The engine's components and their functions are discussed, starting with the rocker arm, which operates the exhaust valve. The camshaft, connected to the crankshaft via a chain or gear, controls the push rod, which in turn operates the rocker arm. The paragraph also describes the cylinder liner, where the piston moves, and the piston rod connected to the piston. The importance of the water jacket for cooling and ports for scavenging are highlighted. The piston rod is connected to the connecting rod, which is guided by the crosshead bearing to ensure vertical movement. The paragraph concludes with an invitation for viewers to ask questions in the comment section.
🔧 Key Components of a Diesel Engine
The second paragraph delves deeper into the mechanics of a diesel engine, focusing on the connecting rod, also known as the con rod, which connects the piston rod to the crankshaft via the crank pin. The crankshaft is the main shaft of the engine and includes the bottom end bearing. The crankcase and relief door are mentioned for their role in managing pressure. The turbocharger's function in supplying fresh air for combustion is explained, as is the air cooler's role in cooling the incoming air. The exhaust gas's path post-turbocharger is also described. The paragraph concludes with a discussion of the bed plate and A-frame, which support the engine's structure, and the engine's exterior temperature zones. The narrator encourages viewers to comment with any doubts for further clarification.
Mindmap
Keywords
💡Two-stroke diesel engine
💡Propeller
💡Rocker arm
💡Camshaft
💡Cylinder liner
💡Piston
💡Scavenging ports
💡Crosshead
💡Turbocharger
💡Crankshaft
Highlights
Two-stroke diesel engines are primarily used for ship propulsion.
The propeller is connected to the tail shaft, intermediate shaft, and crankshaft.
The camshaft operates the push rod, which in turn operates the rocker arm and exhaust valve.
The crankshaft's rotation drives the camshaft through a chain drive or gear mechanism.
The cylinder liner is where the piston moves up and down.
Pistons are connected to piston rods, which in turn are connected to connecting rods.
The jacket filled with water cools the cylinder liner.
Ports in the cylinder liner are used for scavenging and introducing fresh air for combustion.
Connecting rods are connected to the crankshaft through crosshead bearings.
The crankshaft is the main shaft of the diesel engine.
The crankcase relief door releases excess pressure from the crankcase.
The turbocharger supplies fresh air into the scavenger space for combustion.
The air cooler is part of the turbocharger system.
The exhaust gas is reused in the exhaust gas boiler.
The bed plate and a-frame support the engine's structure.
The engine's exterior body is referred to as the in temperature and out temperature.
The importance of understanding the components and functions for exam purposes.
Transcripts
[Music]
two-stroke digit engine
these are the components i have written
here this is the basic line diagram
and the engine a lot of components are
there
so first of all we must know what is the
use of the two-stroke engine onboard the
ship
two-stroke diesel engine is mostly used
for the propulsion purpose
okay this engine is used for the
propulsion purpose
the propeller of the ship is rotated
with the help of the two-stroke diesel
engine
the propeller is connected to the tail
shaft
by in connection with the intermediate
shaft and crankshaft
so there are three shafts are connected
tail shaft intermediate shaft and
crankshaft
of the main engine you can call it main
software zone
so main shaft is connected to the
intermediate intermediate connected to
the tail shaft and the propeller is
mounted on the
tail shaft so this engine is used for
the propulsion purpose
we must know what are the components are
used in this engine
and what are the functions of these
components
so we are going from top to bottom what
are the components
basics we must know okay so here
this is the base line diagram we will
start from the top
the first one is the rocker arm so
the use of the rocker arm is to operate
the
exhaust wall in the dual struck engine
the rocker
is operated by the puss rod store is
here
you can see from here to here is the
puss road
okay so rocker on is operated by the
puss road
the puss road is operated by the cam
shaft
this is the camshaft is here so camshaft
operates the push rod and push rod
operates the
rocker and rocker arm operates the
exhaust tower of the engine
okay so these all things are
interconnected
so how the camshaft is rotated
the camshaft is internally connected
with the crankshaft of the engine
by the chain drive or gear mechanism so
when the crankshaft of the engine
rotates
the camshaft will start rotating and it
will operate the push rod
and push rod will operate the rocker arm
and rocker arm will operate the
exhaust wall okay so this is the basic
function
then we'll go downwards
here you can see from here to here this
here to here this is known as the
cylinder
liner okay cylinder liner
is the name source cylinder so it is the
cylindrical shape
in which piston moves up and down so
this is the cylinder liner here the
arrow marking is
indicating next inside the piston sorry
inside the cylinder liner piston moves
up and down so here this is the piston
i have shown the piston rings here so
this is the piston
okay piston is connected with a piston
rod
okay so this is the piston rod this one
let me write it okay
this is the piston rod
okay piston rod
piston cylinder liner you can see here
the dotted mark i have seen
so these are the dotted marks means this
is the water cooling water
so this portion is known as the jacket
okay
jacket jacket is used to cool the
cylinder
because when the piston moves inside the
cylinder liner
it generates some heats so for the
cooling purpose we use
the jacket a jacket is filled with the
water for the cooling purpose okay this
water we use for the
fresh water generator okay so
this is the jacket here you can see some
holes are there
okay so these holes are known as the
ports
these ports are used for the scavenging
purpose
what the scav engine will discuss later
on so
these ports are used for the scavenging
so fresh air is going through this ports
into the cylinder
for the combustion purpose okay now
we'll go downwards again
this is a piston rod and the piston rod
is connected to the
connecting rod so this is known as the
connecting rod
we can see here connecting rod is
connected to the
piston rod and in the short form we also
call it
con rod the piston rod is connected to
the
connecting rod through the cross head
okay so this is known as the
cursed bearing from here this
is the crosshair bearing
these two lines this one and this one
these are the guides
okay and this is the cross head
connecting dot is also indicating here
these two lines are the guide guide
means they are guiding the crosshair in
the vertical direction okay
for the linear motion when the piston
moves up and down
it it should not uh misalign so for that
crosshair is used
because it is
connecting to the piston rod and the
connecting rod and the guide are used to
keep the piston movement in the vertical
direction okay
so this connecting rod is connected to
the crane soft
this center one is the crankshaft
here crankshaft means the main shaft of
the diesel engine
so this is the crankshaft the crankshaft
also has some parts
wave crank pen so connecting rod is
connected to the
crank pen crank pin is a part of the
crankshaft okay
so this round circle is known as the
bottom end bearing
okay this bearing is divided in the two
halves
this one is known as the crankcase
relief crank is the leaf door
kangas relief door is used to release
the excess pressure from the crankcase
then we go on this part
this is the turbocharger okay what is
the function of the turbocharger
turbocharger
is used to supply the fresh air into the
scavenger space for the combustion
purpose
so this is a turbocharger this is the
air cooler
so fresh air coming through this way
okay
so and it's going inside and it will go
for the
combustion and the air intake is taken
from here
and the turbocharger is driven by the
exhaust case of the diesel engine
so after driving the turbocharger
exhaust case
will go to the for the reuse in the
exhaust case boiler
so this is the exhaust gas going from
here
this exhaust wall is provided here
this is the these are the parts of the
diesel engine
then we'll go here this is known as the
bad plate
okay this is known as the
bed plate then you can see from here
it is go like this
so this is the same like a
so from here to here this body is known
as the a-frame
bad blade a frame on the top of the
a-frame
the cylinder block is mounted
so this is known as the end temperature
okay
so from here to here is known as the in
temperature
interpolation means outside body of the
engine not a slender liner okay
so these are the basic parts of the
diesel engine lot of parts are there
but here we are looking after
some important parts which are most
useful for your exams purpose
i hope you all understand these parts if
you have any doubts
go to the comment box and let me know
what are the doubts you have
[Music]
you
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