The document summarizes a presentation on dual clutch transmissions (DCT). It provides an overview of the history and development of DCT, from its invention in 1939 to its use in modern cars. It describes the components and operation of a 6-speed DCT gearbox, explaining how it differs from manual and automatic transmissions. DCT uses two separate clutches for odd and even gears, allowing direct gear changes without interrupting power flow for a smoother driving experience than manual transmission. It also offers performance advantages over traditional automatic transmissions by being lighter and easier to repair.

1. A seminar on
Dual Clutch Transmission
Presented by
Shubham Kumar Gupta
Roll no. 13/ME/143
Department of Mechanical Engineering

2. Presentation outline:
Introduction
History of DCT development
Meshing of gears
Components of a 6 speed DCT gear box
Operation of a 6 speed DCT gearbox
How it is different from manual and automatic
transmission ?
Conclusion

3. Introduction
A dual-clutch transmission, (DCT) (sometimes referred
to as a twin-clutch transmission or double-clutch
transmission), is a type of automatic transmission
or automated automotive transmission. It uses two
separate clutches for odd and even gear sets. It can
fundamentally be described as two separate manual
transmissions (with their respective clutches) contained
within one housing, and working as one unit.

4. History
o The man who invented the dual-clutch gearbox was a pioneer in automotive
engineering. His name was Adolphe Kégresse. In 1939, Kégresse conceived the
idea for a dual-clutch gearbox, which he hoped to use on the legendary Citroën
"Traction" vehicle. Unfortunately, adverse business circumstances prevented
further development.
o Both Audi and Porsche picked up on the dual-clutch concept, although its use
was limited at first to racecars.
o In 1986, a Porsche 962 won the Monza 1000 Kilometer World Sports Prototype
Championship race - the first win for a car equipped with the PDK semi-
automatic paddle-shifted transmission.
o Audi also made history in 1985 when a Sport quattro S1 rally car equipped with
dual-clutch transmission won the Pikes Peak hill climb, a race up the 4,300-
meter-high mountain.
o Volkswagen has been a pioneer in dual-clutch transmissions.
o Ford is the second major manufacturer to commit to dual-clutch transmissions,
made by Ford of Europe and its 50/50 joint venture transmission manufacturer,
GETRAG-Ford.

5. How a gear is connected to shaft?

6. Structure of a dual clutch transmission gearbox

8. Operation of dual clutch transmission gearbox

14. Better than a manual transmission

15. o A phenomenon called "shift shock" or "torque interrupt“ occurs
in a manual transmission. For an unskilled driver, this can result
in passengers being thrown forward and back again as gears are
changed.
o Cars with DCT are easy to drive

16. Better than an automatic transmission
o Auto transmission has 5 clutch packs for 6
speed transmission .
o The geometry is complex.
o Auto transmission gearbox is heavier than DCT
gearbox.
o DCT is easy to repair.
o Auto transmission uses a torque converter
instead of clutch packs.

17. Conclusion:
Commercialization of the dual-clutch transmission, however,
has not been feasible until recently. It is having a serious
competition with CVTs but it is being used in most of the
sports car manufactured by BMW, Porche, Nissan, Mercedes.
The car that uses DCT are Ford Figo, Volkswagen Polo GT,
Skoda Rapid, Volkswagen Vento, etc.