Module-1_Transmission System.pdf

Vehicle Systems Module 1 Notes 1

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 :
Transmissionsysteminacarhelpstotransmit
mechanicalpowerfromthecarenginetogive
kineticenergytothewheels.

3. Layout :

4. Functions :
•Toprovidethehightorqueatthetimeofstarting,hillclimbing,
acceleratingandpullingaloadsincehightractiveeffortis
needed
•Itpermitsenginecrankshafttorevolveathighspeed,whilethe
wheelsturnatslowerspeeds
•Variabletorquebysetofgears
•Vehiclespeedcanbechangedkeepingenginespeedsamewith
certainlimit
•Thetransmissionalsoprovidesaneutralpositionsothatthe
engineandtheroadwheelsaredisconnectedevenwiththe
clutchintheengagedposition
•Ameanstobackthecarbyreversingthedirectionofrotation
ofthedriveisalsoprovidedbythetransmission

5. Necessity / Requirements :
•Variationofresistancetothevehiclemotionatvarious
speeds
•Variationoftractiveeffortofthevehicleavailableatvarious
speeds
•Toengagedordisengagedthepowerfromengineto
transmissionsystem
•Totransmitthetorque
•Todistributethefinaltorqueequallybetweenthedriving
wheels.
•ToProvidethetorqueneededtomovethevehicleundera
varietyofroadandloadconditions.

6. Types of Gear Boxes :
•Manual
•Sliding Mesh Gear box
•Constant Mesh Gear box
•Synchromesh Gear box
•Automatic
•Over drive (semi-automatic)
•Fluid drive or Fluid coupling
•Fully automatic
•Epicyclic gear box
•Free Wheeling unit
•Torque Convertor

7. 1. Sliding mesh gear box :

8. 2.Constant Mesh Gear Box :

9. Double-Declutching :

10. Advantages of Constant
Mesh Gearbox :

11. Synchromesh
Gearbox :
•This type of gearbox is similar to
the constant mesh type gearbox.
•Instead of using dog clutches here
synchronizers are used.
•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 :
•1.Mechanismwithgearleverontopof
TransmissionCase
•2.Mechanismwithgearleveronsteering
Column

13. 1. Mechanism with gear lever on top
of Transmission Case

14. 2. Mechanism with gear lever on
steering Column

15. Gear Box Trouble Shooting

16. Gear Box Trouble Shooting

17. Gear Box Trouble Shooting

18. Gear Box Trouble Shooting

19. Gear Box Trouble Shooting

20. Gear Box Trouble Shooting

21. Manual Transmission Link :
•https://youtu.be/wCu9W9xNwtI

22. Overdrive:
•Is a device which is usedto
step up thegear ratio in
the vehicle.
•It is mounted inbetween
transmission and propeller
shaft.
•Atransmission is in
overdrive whenthe
transmission output shaft
is turning faster than
thetransmission input
shaft, or clutch gear.
•Overdrive is generally fixed
on top gear only.
Link:
https://www.youtube.com/watch?v=R
uVINSha4VM

23. Hydrodynamic Torque
Converter:
•ATorqueConvertor
isatypeoffluid
couplingcapableof
producingtorque.
•Replacement of
ClutchforAutomatic
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)
•Link : https://youtu.be/q0aOXVndCx4