The document summarizes the transmission system of an automobile. It defines the transmission system as the mechanism that transmits power from the engine to the driving wheels. It has three main components - the clutch, gearbox, and propeller shaft. The transmission allows the engine to be disconnected from the wheels, connected smoothly, and drives the wheels at different speeds. It enables torque multiplication for starting and leverage variation between the engine and wheels. The document discusses different types of transmission systems including mechanical, hydraulic, electrical and automatic systems. It also explains the power flow in sliding mesh and constant mesh gearboxes.

1. STUDY OF TRANSMISSION
SYSTEM OF AUTOMOBILE
Prepared by-
Ganvit Jigar (U14ME074)
Chavda Nikhil (U14ME075)
Lad Jay (U14ME076)

2. WHAT IS TRANSMISSION
SYSTEM??
 The Mechanism that transmits the power developed
by the engine of the automobile to the driving wheel
is called the transmission system (or Power
Train)
 In order to propel the vehicle, a particular speed
and power changing devices is require to transfer
the power developed by the engine to the driving
wheel due to constant changing requirements.
These devices are known as Transmissions.

3. COMPONENTS OF
TRANSMISSION SYSTEM

4. PRINCIPLES OF
TRANSMISSION
 The torque produced by a petrol or diesel engine is
not maximum at the start.
 It increases with increases of speed until at about
50 to 60% of the engine speed providing maximum
H.P., maximum torque value is reached.
 In this case, some means must be used to increase
or multiply the engine torque for starting vehicles
from rest.

5. PRINCIPLES OF
TRANSMISSION
 Transmission means should provided usually a
starting torque of about 13 to 15 times that of
engine required at the road wheels when the clutch
is engaged because the engine power is a function
of torque and it’s speed.
 Therefore for a constant power output torque varies
inversely with torque.
Power = 2 π N T/ 60000 kW
For constant Power, T α 1/N

6. PURPOSE OF TRANSMISSION
SYSTEM
 It enables engine to be disconnected from the
running driving wheels.
 It enables the running engine to be connected to
the driving wheel smoothly.
 It enables the driving wheels to be driven at
different speeds.
 It enables turning of the drive round through 90
degree.
 It enables the reduction of engine speed in the ratio
of 4:1 incase of passenger car and in a greater ratio
incase of lorries.
 It enables leverage between engine and wheels to
be varied

7. TYPES OF TRANSMISSION
SYSTEM
A. Mechanical Transmission system
 Clutch, gear box, and live axle transmission
 Clutch, gear box, and dead axle transmission
 Clutch, gear box, and axle less transmission
B. Hydraulic transmission
 Hydro static
 Hydro dynamic
C. Electrical and electromagnetic transmission

8. CONTINUE..
D. Manually operated selective or
synchromesh transmission
E. Overdrive of semiautomatic or combine
selective transmission
F. Chrysler semiautomatic
G. Automatic
 Hydromatic
 Torque converter

9. TYPES OF GEAR BOX

10. ADVANTAGES OF CONSTANT MESH
OVER SLIDING MESH GEARBOX
 Helical and herringbone gear can be used in these
gearboxes and therefore, constant mesh gearboxes
are quieter.
 Since the gears are engaged by dog clutches, if
any damage occurs while engaging the gears, the
dog unit members get damaged and not the gear
wheels.

11. TYPES OF GEAR BOX

12. POWER FLOW IN SLIDING
MESH GEAR BOX

13. POWER FLOW IN CONSTANT MESH
GEAR BOX

14. POWER FLOW IN CONSTANT MESH
GEAR BOX

15. POWER FLOW IN CONSTANT MESH
GEAR BOX

16. POWER FLOW IN CONSTANT MESH
GEAR BOX