STUDY OF TRANSMISSION

SYSTEM OF AUTOMOBILE

Prepared by-

Ganvit Jigar (U14ME074)Chavda Nikhil (U14ME075)Lad Jay (U14ME076)

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.

COMPONENTS OF TRANSMISSION SYSTEM

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.

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

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

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

CONTINUE..D. Manually operated selective or synchromesh transmission

E. Overdrive of semiautomatic or combine selective transmission

F. Chrysler semiautomatic

G. Automatic Hydromatic Torque converter

TYPES OF GEAR BOX

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.

TYPES OF GEAR BOX

POWER FLOW IN SLIDING MESH GEAR BOX

POWER FLOW IN

CONSTANT MESH GEAR BOX

POWER FLOW IN

CONSTANT MESH GEAR BOX

POWER FLOW IN

CONSTANT MESH GEAR BOX

POWER FLOW IN

CONSTANT MESH GEAR BOX

THANK YOU