Ship engine components and functions #mainengine #2strokeengine

Summary

This 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

00:00

🚢 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.

05:00

🔧 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.

Keywords

💡Two-stroke diesel engine

A two-stroke diesel engine is a type of internal combustion engine used primarily for propulsion on ships. It completes a power cycle with two movements of the piston. In the context of the video, it is the engine used to rotate the propeller of a ship, generating the mechanical power necessary for propulsion.

💡Propeller

A propeller is a rotating device that powers the movement of the ship through water by converting rotational energy into thrust. In the video, it is mentioned that the ship's propeller is connected to the tail shaft, intermediate shaft, and crankshaft, all driven by the two-stroke diesel engine.

💡Rocker arm

A rocker arm is a part of the engine that helps to operate the exhaust valve by transferring motion from the pushrod. The video explains how the rocker arm is connected to the push rod and camshaft, and how it plays a key role in opening and closing the exhaust valve, ensuring the proper exhaust of gases.

💡Camshaft

A camshaft is a shaft in an engine that controls the timing of the valve's opening and closing. In the video, it is highlighted that the camshaft drives the push rod, which in turn operates the rocker arm, thereby controlling the exhaust valve's motion during the engine's cycle.

💡Cylinder liner

The cylinder liner is a cylindrical component that houses the piston, allowing it to move up and down while providing a smooth surface for operation. In the video, the cylinder liner is described as essential for guiding the piston's motion, and it is cooled by a water jacket to prevent overheating.

💡Piston

A piston is a moving component inside the cylinder liner that converts the fuel combustion's energy into mechanical work. The video explains how the piston is connected to the piston rod and moves up and down within the cylinder liner, driving the engine’s power cycle.

💡Scavenging ports

Scavenging ports are openings in the cylinder liner through which fresh air enters the combustion chamber, facilitating the removal of exhaust gases and introducing fresh air for the next combustion cycle. The video discusses how these ports are essential for providing air for combustion, a process called scavenging.

💡Crosshead

A crosshead is a part of the engine that connects the piston rod to the connecting rod, ensuring smooth linear motion of the piston without sideways movement. In the video, the crosshead is mentioned as being guided by two vertical lines called guides, keeping the piston’s movement aligned during operation.

💡Turbocharger

A turbocharger is a device used to force more air into the engine’s combustion chamber to increase its efficiency and power output. The video explains that the turbocharger supplies fresh air for combustion by utilizing exhaust gases from the engine, thus boosting the engine's performance.

💡Crankshaft

The crankshaft is a rotating shaft that converts the piston's reciprocating (up and down) motion into rotational motion. In the video, the crankshaft is described as the main component of the engine, to which the connecting rod is attached, and it is ultimately responsible for transferring power to the propeller of the ship.

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