transissison

1. Transmission System
in an Automobile
Shailja Chaudhry
NIT Kurukshetra

2. What is a Transmission?
 The word ‘Transmission’ means the whole
of the mechanism that transmits the power
from the engine crankshaft to the rear
wheels, providing the suitable variations of
the engine torque at the road wheels,
whenever required.

3. Types of Transmission
 Manual transmission
 Fully automatic Transmission
 Semi-Automatic Transmission
 Continuously Variable Transmission

4. Manual Transmission
Components of Manual Transmission:
 Clutch
 Gearbox
 Differential

5. What is clutch
 It is a device which carries a power form engine to
drive wheel through shafts.
 It is located between flywheel and gearbox

6. Construction of Clutch

8. How it Works

11. Types of
Clutches

12. Single Plate Clutch

13. Multi-Plate Clutch

14. Cone Clutch

15. Electromagnetic Clutch

16. Centrifugal Clutch

17. Gearbox

18. Gear Ratio
 It is the ratio of the no. of teeth on the driven
wheel to no. of teeth on the driver wheel or the
speed of rotation of the driver to the driven .
For example:
Gear ratio,
G=(20/10)=2:1
(smaller gear is the driver) 20
Teeth
10
Teeth

19. Types of Gearbox
 Constant mesh type
 Synchromesh type
 Sliding mesh type

21. Constant Mesh Type

22. Dog Gear

23. Synchromesh type
Gearbox
Synchro collar

24. Sliding Mesh type

25. First Gear

26. Second Gear

27. Third Gear

28. Fourth Gear

29. Reverse Gear

30. Sliding Mesh
 Oldest and the simplest type of transmission
 Spur gears were used
 Main shaft gears splined to the main shaft
 Gear shift is achieved by sliding the gears on main
shaft
 Low mechanical efficiency
 Noisy operation

31. Constant Mesh
• The gears on the main shaft and lay shaft are in
constant mesh
• Main shaft gears are free to rotate
• Gear engagement is achieved by dog clutches splined
to the main shaft
• Helical gears are used

32. Synchro Mesh
 Gears are in constant mesh
 Instead of dog clutch synchroniser unit is used
 Each pair of gear has one synchroniser unit
 Gears are first brought into frictional contact which
equalizes their speed after which the actual engagement
takes place

33. Differential

34. Differential
 Differential is a mechanism which
provide different speed to tyres at
cornering.
 It provides equal torque on both tyre not
power.

35. Types of Differentials
 Open Differential
 Limited-Slip Differential
 Locking Differential
 Auto Limited-Slip Differential

37.  From the differential, power is transmitted to
the rear axles and from there to the wheels of
the Automobile.

38. Thank You