The document explains the concept of 'transmission' as the mechanism that transmits power from the engine crankshaft to the rear wheels, detailing various types of transmissions such as manual, automatic, and continuously variable. It discusses the components of manual transmission, including the clutch, gearbox, and differential, along with various types of clutches and gear systems. Additionally, it describes the function of the differential in providing speed variation to wheels during cornering.

2.  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.

4. Manual transmission
Fully automatic Transmission
Semi-Automatic Transmission
Continuously Variable Transmission

5. Components of Manual Transmission:
Clutch
Gearbox
Differential

6.  It is a device which carries a power form
engine to drive wheel through shafts.
 It is located between flywheel and gearbox

10. Types of
Clutches

16. Gearbox

18.  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.  Constant mesh type
 Synchromesh type
 Sliding mesh type

29.  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

30.  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

31.  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 is a mechanism which provide
different speed to tyres at cornering.
 It provides equal torque on both tyre not
power.
 From the differential, power is transmitted to
the rear axles and from there to the wheels .

34.  Open Differential
 Limited-Slip Differential
 Locking Differential
 Auto Limited-Slip Differential