1. Vehicle Systems
Topic- Transmission System
BY
Prof. Pratik Raut
Class-B.E.(Mechanical) Div.: A & B SEM-VII
CO-1 : Understand the working of different Vehicle Systems and Subsystems
2. Transmission System :
Transmission system in a car helps to transmit
mechanical power from the car engine to give
kinetic energy to the wheels.
4. Functions :
โข To provide the high torque at the time of starting, hill climbing,
accelerating and pulling a load since high tractive effort is
needed
โข It permits engine crankshaft to revolve at high speed, while the
wheels turn at slower speeds
โข Variable torque by set of gears
โข Vehicle speed can be changed keeping engine speed same with
certain limit
โข The transmission also provides a neutral position so that the
engine and the road wheels are disconnected even with the
clutch in the engaged position
โข A means to back the car by reversing the direction of rotation
of the drive is also provided by the transmission
5. Necessity / Requirements :
โข Variation of resistance to the vehicle motion at various
speeds
โข Variation of tractive effort of the vehicle available at various
speeds
โข To engaged or disengaged the power from engine to
transmission system
โข To transmit the torque
โข To distribute the final torque equally between the driving
wheels.
โข To Provide the torque needed to move the vehicle under a
variety of road and load conditions.
11. Synchromesh
Gearbox :
โข This type of gearbox is similar to
the constant mesh type gearbox.
โข Instead of using dog clutches here
synchronizers are used.
โข The modern cars use helical gears
and synchromesh devices in
gearboxes, that synchronize the
rotation of gears that are about to
be meshed
12. Gear selector Mechanisms :
โข 1. Mechanism with gear lever on top of
Transmission Case
โข 2. Mechanism with gear lever on steering
Column
22. Overdrive :
โข Is a device which is used to
step up the gear ratio in
the vehicle.
โข It is mounted in between
transmission and propeller
shaft.
โข A transmission is in
overdrive when the
transmission output shaft
is turning faster than
the transmission input
shaft, or clutch gear.
โข Overdrive is generally fixed
on top gear only.
Link:
https://www.youtube.com/watch?v=R
uVINSha4VM
23. Hydrodynamic Torque
Converter:
โข A Torque Convertor
is a type of fluid
coupling capable of
producing torque.
โข Replacement of
Clutch for Automatic
Transmission
Vehicle.
Link : https://youtu.be/bRcDvCj_JPs
24. Epicyclic Gear Box (Not in Syllabus)
Link : https://youtu.be/ARd-Om2VyiE
https://www.youtube.com/watch?v=u_y1S8C0Hmc
25. Comparison between
AMT vs CVT vs DCT vs AT :
(Not in Syllabus)
โข Link : https://youtu.be/q0aOXVndCx4