Study on power_transmission_system is Completely done by Md. Sumon Ahmed, ID#14207045, Student of IUBAT-International University of Business Agriculture & Technology

1. Presented By
Md. Sumon Ahmed
ID# 14207045
Program: Mechanical Engineering
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IUBAT—International University of Business Agriculture & Technology
A study on Power Transmission System in Automotive Vehicle
at Vehicle Care Pvt. Ltd.

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3. Contents
 Introduction
 Objectives
 Company Profile
 Transmission System
 Different Parts of Transmission System
 Transmission System Operation
 Maintenance
 Trouble-Shooting
 Servicing at Vehicle Care Pvt. Ltd.
 Analysis
 Recommendation
 Conclusion
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4. Introduction
 To make a bridge between theoretical knowledge and practical skills industrial
training is very important.
 Automobile technology has been advancing rapidly and many new systems have
been implemented.
 During the training period, relevant and pertinent knowledge about Transmission
System and functioning of vehicles was obtained.
 However, an automobile is a complex system comprising thousands of parts.
Therefore, only specific systems in vehicles which were studied during the short
industrial attachment period will be discussed in this presentation.
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5. Objectives
Broad Objective
The Broad objective of this study is to gain practical work experience and implement
theoretical knowledge in the field of automobiles.
Specific Objectives
 To study about Power Transmission System
 To study about Manual Transmission System
 To study about Automatic Transmission System
 To study about CVT
 To study about Propeller Shaft in Vehicle
 To study about Differential Gearbox
 To study about working principle/Function all of the systems
 To study maintenance of all of the system
 To study trouble-shooting of the system
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6. Company Profile
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7. Vehicle Care Pvt. Ltd. is one of the biggest servicing center in Dhaka city. “Vehicle Care Pvt. Ltd.” is
the name which established on 19th April , 2013 at capital city, Dhaka, Bangladesh. Vehicle Care Pvt.
Ltd. itself lighted and starting all types of repairing, servicing, overhauling and other relevant jobs.
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8. Vehicle Care locations
3rd Phase connecting road, Diabari,
Uttara,
Dhaka-1230, Bangladesh.
Telephone: 01775-788261-6
E-mail: vehiclecareuttara@gmail.com
Web: www.vehiclecarebd.com
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9. Organogram
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Executive Director
HR Workshop InchargeAccounts
Chairman
Marketing
Executive
Helper
Mechanic
Senior Mechanic
Service EngineerStore
Security
Delivery
Trainee Engineer

10. Services of Vehicle Care Pvt. Ltd.
Computerized wheel balancing
Computerized wheel alignment
Injector testing & cleaning
Engine overhauling
Engine & gear box replacement
Suspension system works
Steering system works
Brake system works
A/C & Electric works
General servicing with car wash
Auto transmission fluid change
Denting & Painting
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11. Machineries in Vehicle Care Pvt. Ltd.
Computerized wheel balancing machine
Diagnostic scanner for electric system
Injector tester & cleaner
ATF changer machine
Paint booth ( latest with all options )
Polish machine
Four two post car lift
Two scissor lift
High pressure water cleaner
Hydraulic transmission jack & floor jack
Battery charger
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12. Transmission System
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13. Transmission System
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Concepts
 Reduce gear torque interruption.
 Increase fuel efficiency.
 Provide speed and torque
conversions from a rotating power
source to another device.
Device which transfers energy between a power source and a load.

14. Parts of Transmission System
 Clutch
 Transmission Gearbox
 Propeller shaft/ Drive shaft
 Universal Joint
 Slip Joint
 Differential Gearbox
 Axel
 Wheel
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15. Clutch
Device which is used in the transmission system to engage and disengage the
power engine to the transmission or gear box.
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16. Parts of Clutch
There are three main parts
• Driving member
• Driven member
• Operating member
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17. Operation of Clutch
Disengaged
When the clutch
pedal is pressed
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Engaged
When the
clutch pedal is
released

18. Transmission Gearbox
A set of gears with its casing,
especially in a motor vehicle.
 Need to operate at a relatively
high rotational speed, which is
inappropriate for starting,
stopping, and slower travel.
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19. Compound gear ratios
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First set of gears
Number of teeth on
driven gear = 24
Number of teeth on
driver gear = 12
Formula =
driven / driver
24/12 = 2
Second set of gears
Number of teeth on
driven gear = 30
Number of teeth on
driver gear = 10
Formula =
driven/ driver
30/10 = 3
Multiply both ratios together
= 2 x 3
Overall ratio = 6:1
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20. Kinds of Transmission Systems
a) Manual Transmission,
b) Automatic Transmission,
c) Semi-Automatic Transmission,
d) Continuously-Variable Transmission (C.V.T.).
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21. Manual Transmission
Components
 Transmission Shafts
 Blocking Ring
 Cluster Gear Snap Ring
 Main shaft Bearing
 Synchro Hub
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Referred as stick shift transmission

22. Operation of Manual Transmission
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23. Automatic Transmission System
Components-
 Torque Converter
 Planetary Gear Sets
 Governor and Modulator
 Hydraulic System
 Seals and Gaskets
 Computer
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o Different speeds are obtained automatically.
o A completed gear set, called planetary gears.

24. Torque Converter
Components
1. Pump (Impeller)
2. Turbine
3. Stator
4. Transmission fluid
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 Transmits the twisting force or torque.
 Engine and Transmission automatically coupled and uncoupled.

25. Torque Converter Operation
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Gearbox
Flywheel Turbine
Impeller
Converter
Causing Stator

26. Planetary Gear Sets
• The "heart" of an automatic transmission.
• Changing gear ratios without having to engage or disengage individual gears.
Planetary has three main parts
a) Sun (centre gear)
b) Planets (small gears turning
around the sun)
c) Ring or annulus gear
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27. Governor and Modulator
• Governor is a clever valve that tells the
transmission how fast the car is going.
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 Governor and Modulator or Throttle valve that monitor speed and throttle position in
order to determine when to shift gear.
• Modulator senses the
manifold pressure
under a greater load.

28. Hydraulic (Pump & Valve Body)
 Neat pump, called a gear pump
 It draws fluid from a sump
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 The brain of the automatic transmission
 Contains a maze of channels and passages

29. Computer controls & Seals
 That redirect the fluid to the appropriate
clutch pack or servo in order to control
shifting gear.
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 Control the flow of hydraulic fluid.
 Two main external seals: front seal
and rear seal.Solenoid pack
Seal

30. Automatic Transmission operation
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31. Automatic Transmission Modes
U.S. Government standards must
have the modes ordered P-R-N-D-L
 P (Park)
 N (Neutral)
 R (Reverse)
 D (Drive)
 3 (Third)
 2 (Second)
 1 or L (First or Low)
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Other Non-Common Gear Modes
S (Sport):
B (Brake):
M, -/+:
W (winter):
D2 to D5

32. CVT Transmission
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33. Propeller Shaft
• Transfers power from the
transmission to the rear
axle.
• Transmitting torque and
rotation.
• To connect other
components of a drive
train.
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34. Cont..(Propeller shaft)
One-piece drive shaft
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Two-piece drive shaft
Slip-in-tube drive shaft
New type that improves crash safety. It can
be compressed to absorb energy in the event
of a crash, so is also known as a collapsible
drive shaft.

35. Propeller Shaft Joints
 Joint that connects two rotating shafts,
allowing them to move in all directions.
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 The Propeller shaft with a slip joint is
called telescopic propeller shaft.
 Increase or decrease the length
of propeller shaft.
Slip Joint
Universal Joint

36. Differential Gearbox
Components
• Pinion gears.
• Side gears.
• Ring gear.
• spider gears
• Left and Right axle shaft.
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To transmit power from the engine to the wheels while allowing them to spin at
different speeds. Avoid skidding of the rear wheel.

37. Working of Differential Assembly
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38. Axle
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Mechanical part of a vehicle which is a device like 2 wheel separated by a rod or
other stabilizing device.
Dead Axle
It move only when vehicle is move due to
drive axle.
Live Axle/Drive Axle
A live axle is an axle that transmits power to
a pair of wheels.
 It exist for load bearing purpose
 It distribute weight of vehicle

39. Construction
The basic part of an drive axle is -
1. Hub
2. CV Joints (Outer)
3. CV Joints (Inner)
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Locate at the end of the axle.
Used for join wheel to axle.

40. Construction
Inner CV Joint
Allow for suspension changes while
axle is rotating.
Outer CV Joint
Allow wheel to move or revolve
while axle is rotating or vehicle
is turning at an angle.
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41. Wheel
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P205/75R x 15 92H
205-cross-sectional width in mm
75-aspect ratio
R-radial construction
15-rim diameter in inches
92-load index
H-speed rating (130 mph/210
km/h)

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43. Maintenance
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Description Check Replacement interval
Fluid levels of
Manual Transmission
Every Three(3) Month 30,000 miles
Automatic Transmission
Fluid
6,000 miles 10,000 to 15,000 miles
Automatic Transmission
fluid flushed
30,000 miles
Transmission Filter
Change
According to the user
manual
CVT Transmission Fluid 6,000 miles 10,000 to 15,000 miles
Differential oil 30,000 to 50,000 miles
Engine oil 10,000 Km

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Problem Findings, Analysis
& Solution

46. Problem-1
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 Gear not shift smoothly in manual transmission system

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Problem-2
 Fluid leak in automatic transmission system

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Problem-3
 Steering hard to move wheel and make noise

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Problem-4
 Transmission Slipping, Car Won’t Shift

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Problem-5
 Car cannot go backward

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Problem-6
 Transmission Overheating

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Problem-7
 Fluid leak or Drain out continuously in automatic transmission System

53. Analysis
• The analysis has been accomplished after observing some of job
cards. I picked more than 15 job cards for analysis. Among them I
found many of complains were written in the job cards.
• The most common complains against transmission are as bellow:
 Transmission overheat
 Fluid leak
 Axle make noise.
 Gear shifting problem
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84
2 1
Number of Car
Gear Shift problem
Transmission Overheting
Gear Oil leak
Axle problem
53%
27%
13%
7%
0
1
2
3
4
5
6
7
8
9
Gear Shifting
Problem
Transmission
Overheating
Gear Oil Leak Axle Problem

55. Recommendations
 Safety first-most of the worker they don’t care about safety, whenever a
car is pull up by lift they stay in front of car, side and under the car. After
they staying under the car with out giving support car lift.
 Need to appoint more employees. They provide services delay because
they have no sufficient worker. By appoint more worker they can give
proper service quickly as well as earn more money.
 They need to make a better relationship between management and
workers.
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 Working place should be cleaned regularly.
Every organization need to maintain 5S method to success in future

57. Conclusion
In my presentation I tried my best to give the description about
Transmission System and my practical works. During this practicum
period at the Vehicle Care Pvt. Ltd. was my basic vehicle servicing for
gaining knowledge as well as experience. Because of its having
advanced technology in automotive so it is a great achievement for me.
At last I want to say it was a very interesting and great knowledge base
journey for my student life as well as my future life.
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