study of transmission system of automobile
TRANSCRIPT
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STUDY OF TRANSMISSION
SYSTEM OF AUTOMOBILE
Prepared by-
Ganvit Jigar (U14ME074)Chavda Nikhil (U14ME075)Lad Jay (U14ME076)
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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.
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COMPONENTS OF TRANSMISSION SYSTEM
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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.
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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
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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
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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
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CONTINUE..D. Manually operated selective or synchromesh transmission
E. Overdrive of semiautomatic or combine selective transmission
F. Chrysler semiautomatic
G. Automatic Hydromatic Torque converter
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TYPES OF GEAR BOX
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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.
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TYPES OF GEAR BOX
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POWER FLOW IN SLIDING MESH GEAR BOX
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POWER FLOW IN
CONSTANT MESH GEAR BOX
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POWER FLOW IN
CONSTANT MESH GEAR BOX
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POWER FLOW IN
CONSTANT MESH GEAR BOX
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POWER FLOW IN
CONSTANT MESH GEAR BOX
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THANK YOU