2. 09/05 Basic automobile, history, petrol vs diesel vs hybrid vs Electrical
10/05 Basic parts of vehicle, engine, chassis, power train, body
11/05 ignition, lubrication cooling, fuel, starting, charging, exhaust
12/05 Tire, axle, steering, brake, abs
15/05 , Ebd, front drive, rear drive 4x4 drive, disc, drum
16/05 , Adas
17/05 , Car accessories
18/05 , Scan, emission Noms, BS standard
19/05 , EV
22/05 , Auto electrical and A/C
23/05 , Convocation and general calss
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GAA PROPERTY
ENGINE
ENGINE IS THE POWER PLANT OF THE AUTOMOBILE
IT GENERATES MOTIVE POWER FOR LOCOMOTION
IT CONVERTS CHEMICAL ENERGY OF THE FUEL TO
MECHANICAL ENERGY
ENGINE DEVELOPS POWER & TORQUE
TORQUE : - Is the capacity to do work. Measured in Kg-m , N-m , Lb-ft
POWER : - How fast the work can be done Measured in - Horse Power,
Kilo watt
عزم
طاقة
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ENGINE
Click
Power
السحب اإلنضغاط القدرة التفريغ
4 شوط
T D C
B D C
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CLUTCH
CLUTCH IS THE CRUCIAL LINK BETWEEN THE POWER
PLANT (ENGINE) AND THE DRIVELINE
THE PURPOSE OF THE CLUTCH IS TO LINK OR DELINK
(ENGAGE OR DIS-ENGAGE) THE ENGINE FROM THE
DRIVELINE, AS DESIRED BY THE DRIVER
IT IS ALSO MAKING STARTING SMOOTH, MAKES IT POSSIBLE
TO STOP THE VEHICLE WITHOUT STALLING AND MAKES ENGINE
OPERATION EASIER
COMPONENTS OF CLUCH
•CLUTCH MASTER CYLINDER
• CLUTCH SLAVE CYLINDER
• RELEASER BEARING
• CLUTCH PRESSURE PLATE
• CLUTCH DRIVEN PLATE
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The torque converter is a coupling
between the engine and transmission
of the vehicle. The purpose is to allow
the vehicle to come to a stop, with the
engine running. From this perspective,
it acts much like an automatic clutch.
TORQUE CONVERTER
تنجره
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Torque converters work by
transferring power, through fluid
motion. An easy way to understand
might be to consider two desk fans.
One connected to power and turned
on, the other unplugged. Motion of
air, coming from the running fan, can
make the blades in the non-running
fan turn. A torque converter works
similarly. Internal blades, attached to
the converter housing and bolted to
the engine flywheel, move
transmission fluid. The motion of
this fluid causes other blades,
attached to the transmission, to turn.
This drives the vehicle and at idle,
allows the engine to run with the
vehicle not moving.
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Structure of Torque converter
◆The flow of the
fluid
in Torque
converter
1. Pump impeller
2. Turbine runner
3. Stator
4. Lockup damper
5. One way clutch
6. Converter front cover
7. Lockup piston
Stator
Pump impeller Turbine
runner
Flow of
fluid
Click
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Basic structure of Automatic transmission
Gear
mechanism
2
Control
system
3
1 Torque
converter
Input
Output
AUTOMATIC
TRANSMISSION
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①Torque converter
The torque converter is composed of three types of impellers: the
pump impeller coupled with the output shaft of the engine, the
turbine runner coupled with the input shaft of the transmission,
and the stator fixed to the case; the inside of the converter is
filled with oil.
The function of the torque converter is to use this oil for
transmitting the driving power from the engine to the
transmission with effective torque conversion, which is done
automatically and sleeplessly
②Transmission mechanism
Because the drive force is transmitted by the torque converter
only, it cannot function as a an efficient power transmission
device; for this reason, a gearbox has been added to the output
shaft of the torque converter.
③Control system
The control system operates the hydraulic multi-disk clutch and
the brakes according to the driving conditions, and together with
gear shifting by the planetary gear set, it sends oil to the torque
converter, lubricates the various transmission parts, etc.
AUTOMATIC
TRANSMISSION
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Click
AUTOMATIC
TRANSMISSION
Planetary gear system
جير بالنتري
جير سن
جير ستار
جير رينج
Ring = 42
Star = 12
Sun = 18
كوكبي
جير
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Gear ratio
Clutch No.2
Clutch No.3
Brake No.2
BrakeNo.2
One way Clutch No.1
Input shaft and Middle planetary shaft are connected
Middle planetary gear rotation is lock
Middle & Rear planetary ring gear are rotation is lock
Left rotation of Middle planetary carrier to case is
locked
Component & Operation
Component & Operation
condition
【1】 Structure AT
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Unlike the automatic transmission which has a
set number of gear ratios, and cars with CVT
use a pulley and belt system to provide an
unlimited range of gear ratios.
Cars with continuously variable transmission
system to take advantage of pulleys and belts
to provide varying gear ratios. This system
consists of a pair of variable diameter pulleys.
While the contribution of one reel is connected
to the engine, and the reel is connected output
to the drive wheels. Metal belt running
between two pulleys. When pulley halves
closer to each other, and a belt of metal or
chain goes higher on the reel and thus
increase the diameter of the reel. This is the
change in the diameter of the reel to achieve a
variety of transfer rates. The ratio can be
achieved when the diameter of the low input
pulley smaller reel production. Thus, the
change in the diameter pulleys play a major
role in changing the ratio of engine speed to
vehicle speed. Unlike traditional transmission
where the ratio of changes in stages when
converting the gears, and the percentage
changes when continuously driving the car
with the CVT system.
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DIFFERENTIAL
The differential on a front wheel drive car is not a
separate component, but is part of (inside) the transaxle. On a
rear wheel drive car, the transmission and differential (drive axle)
are separate, and connected together via a driveshaft.
The purpose of a differential is to allow the two driven wheels
to turn at different speeds. As the car goes around a corner, the
outside wheel travels further than the inside wheel, and thus
must turn more revolutions. If the two wheels were solidly
connected together, one tire would skid any time the car was not
travelling in a straight line.
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DRIVE SHAFTS
In front wheel drive vehicles, the drive shafts transfer
the drive directly from the differential to the front wheels. A short
inner stub shaft is splined to the differential side gear and an
outer stub shaft is splined to the front wheel hub. Each stub
shaft has a yoke, or housing, to accommodate a CV JOINT, at
each end of a connecting intermediate shaft. CV JOINT let the
shaft keep rotating while allowing for changes due to suspension
movement - such as shaft length and horizontal angle, and shaft
angle as the steering turns
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DRIVE SHAFT WITH CV
Constant velocity joint with boot, attachment
parts and grease . CV JOINT.
Click
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STEERING
The basic aim of steering is to ensure that the wheels are
pointing in the desired directions. This is typically achieved by a
series of linkages, rods, pivots and gears
One of the fundamental concepts is that of caster angle - each
wheel is steered with a pivot point ahead of the wheel; this
makes the steering tend to be self-centering towards the
direction of travel.
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An example of a chopper with
raked forks at an extreme
caster angle.
CASTER ANGLE : - Caster angle[1] or castor angle[2] is the angular
displacement from the vertical axis of the suspension of a steered wheel in a
car. Measured in Degrees
STEERING
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Suspension is the term given to the system of springs, shock
absorbers and linkages that connects a vehicle to its wheels and
allows relative motion between the two.
Suspension systems serve a dual purpose — contributing to
the vehicle's road holding/handling and braking for good active
safety and driving pleasure, and keeping vehicle occupants
comfortable and reasonably well isolated from road noise,
bumps, and vibrations, etc
SUSPENSION
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A vehicle brake is a brake used to slow down a vehicle by
converting its kinetic energy into heat. The basic hydraulic
system, most commonly used, usually has six main stages. The
brake pedal, the brake boost (vacuum servo), the master
cylinder, the apportioning valves and finally the roadwheel
brakes themselves.
A drum brake is a brake in which the friction is caused by a set
of brake shoes that press against the inner surface of a rotating
drum. The drum is connected to the rotating roadwheel hub.
The disc brake is a device for slowing or stopping the rotation
of a road wheel. A brake disc (or rotor in U.S. English), usually
made of cast iron or ceramic, is connected to the wheel or the
axle. To stop the wheel, friction material in the form of brake
pads (mounted in a device called a brake caliper) is forced
mechanically, hydraulically, pneumatically or electromagnetically
against both sides of the disc. Friction causes the disc and
attached wheel to slow or stop.
BRAKES
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Make sure double tires have the same air pressure.
SAME AIR PRESSURE
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When installing a disc wheel on
the drum, confirm that there are
no foreign substances on the
contact surface and tighten
the wheel uniformly. If
deformation occurs, brake
jitter due to brake drum inner
distortion may occur.
CONTACT SURFACE
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TORQUE(T)
عزم
Torque, moment or moment of force is the tendency of a force
to rotate an object about an axis
Relationship between force F, torque τ, linear
momentum p, and angular momentum L in a
system which has rotation constrained in one
plane only (forces and moments due to gravity and
friction not considered
T= N x R
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OUT PUT(HP)
طاقه
If the amount of work than an engine can do in a given period
of time is called horse power. The torque is the amount of power
than engine produces.
Out put(HP) = 1/716 X Torque X Speed
Person A, a heavy person with great deal of strength, and
person B, who was not very strong, but who could run fast, had a
competition to see who could carry greatest number of bricks in
a minute.
A, with all his strength, could carry 10 bricks at one time, but
since he could not move very fast, he could only makes 10 round
trips.
One other hand, B, who was not very strong, could carry only 5
bricks at a time, but because he could run fast, he was able to
make 20 round rips
Thus, both persons were able to carry 100 bricks with in the
same period of time
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ENGINE VALVE MECHANISM
OHV = Over head valve OHC = Over Head Cam
shaft
SOHC = Single Over
Head Cam shaft
DOHC = Double Over
Head Cam shaft
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ENGINE VALVE MECHANISM
OHV = Over
head valve
SOHC = Single
Over Head Cam shaft
DOHC = Double
Over Head Cam shaft
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EFI ELECTRONIC FUEL
INJECTION SYSTEM
Fuel injection is a system for admitting fuel into an internal
combustion engine. It has become the primary fuel delivery
system used in automotive engines, having replaced carburetors
during the 1980s and 1990s. A variety of injection systems have
existed since the earliest usage of the internal combustion
engine.
The primary difference between carburetors and fuel injection
is that fuel injection atomizes the fuel by forcibly pumping it
through a small nozzle under high pressure, while a carburetor
relies on suction created by intake air accelerated through a
Venturi tube to draw the fuel into the airstream.
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BATTERY
BATTERY IS THE HEART OF THE ELECTRIC SYSTEM
1. ENGINE OFF: energy is used to operate the lighting
and accessory systems.
2. ENGINE STARTING: Battery Energy is used to operate the
starter motor and to provide current for the ignition system
during cranking.
3. Engine running: Battery energy may be needed when
the vehicle's electrical load requirements exceeded the supply
from the charging system.
The battery is the primary "Source" of electrical energy. It store chemical
energy. The chemical reaction changes chemical energy to electrical
energy.
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DIODE
In electronics, a diode is a two-
terminal electronic component
with an asymmetric transfer
characteristic, with low (ideally
zero) resistance to current flow
in one direction, and high
(ideally infinite) resistance in the
other
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FUSES
Automotive fuses are a class of fuses used to protect the wiring and
electrical equipment for vehicles. They are generally rated for circuits no
higher than 24 volts direct current, but some types are rated for 42-volt
electrical systems. They are occasionally used in non-automotive
electrical products.
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ALTERNATOR
An alternator is an electromechanical device that converts
mechanical energy to electrical energy in the form of alternating
current.
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Dynamo
An alternator is an electromechanical device that converts
mechanical energy to electrical energy in the form of alternating
current.
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STARTING MOTOR
A starter is an electric motor for rotating an internal-
combustion engine so as to initiate the engine's operation under
its own power.
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Automobile air conditioning systems cool the occupants of a
vehicle in hot weather
Air condition will supply hot air in cold weather
AIR CONDITION
Click