The transmission system transfers power from an automobile's engine to the driving wheels. It provides a varied leverage between the engine and wheels through a gearbox, enables speed reduction from 5:1, and allows driving wheels to be driven at different speeds. There are two main types of transmission: manual and automatic. A manual transmission requires the driver to disengage the clutch to change gears, while an automatic transmission uses a torque converter and planetary gears to change gears without the driver operating a clutch. The main components of a manual transmission are the clutch, gearbox, U-joints, shafts, and differential gearbox.

1. Transmission system

2. Transmission system
The mechanism that transmits the power developed by
the engine of automobile to the engine to the driving
wheels is called the TRANSMISSION SYSTEM

3. Requirements Of Transmission System
Provide means of connection and disconnection of
engine with rest of power train without shock and
smoothly.
Provide a varied leverage between the engine and the
drive wheels
Provide means to transfer power in opposite direction..
Enable speed reduction between engine and the drive
wheels in the ratio of 5:1.
Provide means to drive the driving wheels at different
speeds when required.

4. Transmission system
Types of transmission system
1.Manual transmission,
2.Automatic transmission,
• Manual Transmission:
The first transmission invented was the manual
transmission system. The driver needs to
disengage the clutch to disconnect the power from
the engine first, select the target gear, and engage
the clutch again to perform the gear change. This
will challenge a new driver. It always takes time
for a new driver to get used to this skill.

5. Transmission system
Automatic Transmission:
An automatic transmission uses a fluid-coupling
torque converter to replace the clutch to avoid
engaging/disengaging clutch during gear change.
A completed gear set, called planetary gears, is
used to perform gear ratio change instead of
selecting gear manually. A driver no longer needs
to worry about gear selection during driving. It
makes driving a car much easier

6. Manual Transmission:
• The main components of manual transmission
are:
• Clutch
• Gear box
• U- joint
• Shafts
• Differential gear box

7. Manual Transmission:
• Clutch:
Clutch is a device which is used in the transmission
system of automobile to engage and disengage the
engine to the transmission or gear box. It is located
between the transmission and the engine. When the
clutch is engaged, the power flows from the engine to
the rear wheels in a rear- wheel-drive transmission
and the vehicle moves. When the clutch is
disengaged, the power is not transmitted from the
engine to the rear wheels and vehicle stops even if
engine is running.

8. Manual Transmission:
• Gear box:
A gearbox is a mechanical method of transferring
energy from one device to another and is used to
increase torque while reducing speed
• Types of Gear Boxes:
• The following types of gear box are used in
automobiles:
• Sliding Mesh
• Constant Mesh
• Synchromesh.
• Epicyclic gearbox

9. Sliding Mesh Gear Box

10. Sliding Mesh Gear Box

11. Sliding Mesh Gear Box
Second gear position:

12. Sliding Mesh Gear Box
Third gear position:

13. Sliding Mesh Gear Box
Reverse gear position:

14. Constant mesh Gearbox

15. Constant mesh Gearbox
Dog clutch:

16. Synchro mesh Gearbox

17. Synchro mesh Gearbox

18. Epicyclic Gearbox

19. Clutch
Types of clutches:
1. Cone clutch
2. Single plate clutch
3. Multiplate clutch
4. Semi centrifugal clutch
5. Centrifugal clutch

20. Cone clutch

21. Single plate clutch

22. Multiplate clutch

23. Semi centrifugal clutch

24. Centrifugal clutch

25. Propeller shaft

26. Propeller shaft

27. Rear axle drives

28. Final drive system