The document summarizes different types of automatic transmissions. It discusses torque converters, planetary gear sets, and four main types of automatic transmissions: traditional, automated manual, continuously variable, and dual clutch. A torque converter replaces a clutch to change gears hydraulically. Planetary gears provide gear reductions like underdrive and overdrive. Automated manual transmissions automate manual transmissions. Continuously variable transmissions use pulleys to provide infinite gear ratios. Dual clutch transmissions use two clutches to switch between gears more quickly.

1. AUTOMATIC TRANSMISSION
AND ITS TYPES
Submitted to :
Prof. Sukhinderpal
Singh
Submitted by :
Arshdeep Singh
Ashishpreet Singh
Avinash Shah

5. 1. TORQUE CONVERTER
Unlike a manual gearbox, it does not use a clutch to change
gears. Instead, a hydraulic fluid coupling or a torque converter
does this job.

7. Planetary Gear can provide
following gear reductions:
a. Under Drive
(Low Speed , High Torque)
b. Direct Drive
(Same Speed and Torque as of Engine)
c. Neutral
(No power transmitted)
d. Over Drive
(High Speed , Low Torque)
e. Reverse
(Opposite motion of rotation )

8. 2. PLANETARY GEAR SET
(principle of transmission system)
Planet Gear

9. UNDER DRIVE (First Gear)
Principle:- By fixing different gears of Planetary Set, different
speeds can be achieved at the output of transmission.

10. OVER DRIVE (Sixth Gear)

11. REVERSE DRIVE

12. HTTPS://WWW.YOUTUBE.COM/WA
TCH?V=U_Y1S8C0HMC&T=5S
WORKING OF AN AUTOMATIC
TRANSMISSION

13. https://www.youtube.com/watch?v=U
gao6jTyM7k

14. Terminologies of Gear system
• Clutch Packs (Locking of gears)

15. • Hydraulic System
-Pump, Governor, Shift Valves
How Transmission senses?
Vehicle
speed
Load Throttle Pedal
Position
**Governor, Engine Control Unit**
Pump, Shift Valves

16. Hydraulic System
(It routes fluid to all the
different components
in the transmission)
Shift Valve
The shift valve is
pressurized with fluid
from the governor on
one side, and the
throttle valve on the
other.

17. Types of Automatic Transmission
• Traditional Automatic Transmission
• Automated Manual Transmission
• Continuously Variable Transmission
• Dual Clutch Transmission

18. Automated-Manual Transmission
(AMT)
• Automates the current manual transmission.
• Regular Clutch Gear Setup (without a clutch pedal),
which does gear shifting via sensors, actuators and
processors.
• Shifting from automatic to manual(Sports mode)
possible.
• Increased fuel efficiency, economical
Disadvantages-
1. Not effective in hills
2. Jerky shifts if you drive aggressively
3. Not the finest smooth acceleration - which otherwise is
there in Automatic Cars.

19. Costs under INR.50,000 to convert Manual to AMT model
(factory fitting)
Examples : Maruti Celerio, Audi A5 etc.

20. Continuously Variable Transmission
(CVT)
• Two variable-diameter pulleys, each shaped like a pair
of opposing cones, with a metal belt or chain running
between them. One pulley is connected to the engine
(input shaft) and the other to the drive wheels (output
shaft).
• Attains infinite transmission ratios
• The transmission shifts gears to provide the most
appropriate ratio for a given situation: Lowest gears for
starting out, middle gears for acceleration and passing,
and higher gears for fuel-efficient cruising.
• As the car accelerates, the pulleys vary their diameter
to lower the engine speed as car speed rises.

21. https://www.youtube.com/watch?v=PEq5_b4LWNY
PROS
• Step less transmission
• Smooth Drive
• Better
Fuel Consumption
• Good Adaptability
CONS
• Limited Amount of
Torque
• High Costs
• High Wear
Examples- Maruti Suzuki Baleno, Nissan Micra , Honda City/Amaze

22. Widening and contracting
of Pulleys lead to variation
in transmission ratios

23. Dual Clutch Transmission
(DCT)
• Formed to overcome the drawbacks of
manual transmission
• The DCT splits up odd and even gears on
two input shafts , that means two different
manual gear shafts with different clutches
Single Clutch
Transmission

25. https://www.youtube.com/watch?v=lF
Atc-zOKZs

26. Pros
• No lag in transfer of
power to the road
wheels while shifting
gears
• Switches gears faster
• Less fuel consumption
Cons
• High costs

27. Thank You