The mechanism that transmits the

power developed by the engine of

automobile to the engine to the driving

wheels(rear wheels) is called the

TRANSMISSION and the system is called

TRANSMISSION SYSTEM.

It is used to transmit engine torque to

the driving wheels to drive the vehicle

on the road.

.

Provide means of connection and disconnection of engine with

rest of power train without shock and smoothly.

Enable power transmission at varied angles and varied

lengths.

Provide means to drive the driving wheels at different speeds

when required.

Provide a varied leverage between the engine and the drive wheels

ENGINE

FLYWHEEL

CLUTCH

GEAR BOX (or) TRANSMISSION BOX

UNIVERSAL JOINT

PROPELLER SHAFT OR DRIVE SHAFT

DIFFERENTIAL

REAR WHEEL AXLE

REAR WHEELS

Engine is a mechanical device which converts the chemical energy of a fuel into heat or thermal energy and then converts the heat energy into mechanical energy and makes the vehicle to run at different loads.

Engines are again classified into IC or EC Engines and are used for different purposes.

So the main purpose of engine is to transfer mechanical energy to different parts of the transmission system by the crankshaft.

A FLYWHEEL is connected to

the crankshaft of the engine

which is a rotating device.

FLYWHEEL is a body having

large mass and it act as a

reservoir for energy store

coming from the engine.

It stores energy from engine

when it is more and releases

the energy when it is more than

requirement.

In IC engines power produced

in one stroke and the remaining

three strokes are idle. So in

that case a Flywheel supplies

energy to all the rotating parts

and makes the crankshaft to

run at uniform speeds.

The purpose of clutch is to engage and disengage the transmission system from the engine when a vehicle is being driven away from a standstill and when the gearbox gear change is necessary. The gradual increase in the transfer of engine torque to the transmissions roust be smooth.

When the clutch is in the coupling (normal running) position, power flows through it from the engine to the transmission. If the transmission is in gear, then power flows on through to the propelling wheels of the vehicle.

The clutch contains a friction disc, spring arrangement and pressure plate for pressing this disc tightly against the smooth rear face of the flywheel.

•This GEAR BOX is considered as

the heart of the transmission

system.

• It is located between Clutch and

Propeller shaft .

• Gear box varies the leverage

(speed ratio & hence torque

ratio) between the engine

&driving wheels.

• It is provided with either 4

speed or 5 speed ratios or more

depending on design.

to change the gears to travel at

different speeds.

A UNIVERSAL JOINT is used to

transmit power from gear box to

PROPELLER SHAFT. And then from

PROPELLER SHAFT to DIFFRENTIAL.

So to maintain uniform speed and

mation,two universal joints are

used, one b/w gear box and drive

shaft and anoher b/w drive shaft

and differential and the coupling is

called universal coupling.

They are designed to to eliminate

torque and speed fluctions(for

constant velocity)

If only one universal joint isused,

speed fluctuations will not be

neutralized

Front engine rear wheel drive

Reduction in car height (lowering of

body).

It propels the vehicle forward, so called

propeller shaft.

A Propeller Shaft connects a gearbox to a

Differential.

It is used to transmit the drive force

generated by the engine to the axles.

It is provided with two U-joints to

maintain constant velocity and

positioning of differential at different

plane.

It is provided with a slip joint to take

care of the change inlength.

It is strong enough to handle maximum

low gear torque.

To transfer the engine

power to the rear wheels.

To act as the final gear

reduction in the vehicle.

To make the wheels to

rotate at different speeds

neglecting the turn.

It is provided with

different gears to transmit

power to rear wheels.

Transmits rotary motion

and torque from the

engine-transmission-

driveshaft to the wheels.

Provides speed reduction

and torque multiplication.

Finally provide power from

engine to road wheels (rear

wheels) through many

different steps.

THANK YOU

T.RAMBABUMECHANICAL –B

12A91A03B9