The power developed by the engine is transferred to the wheels by transmission system. Transmission system must do three jobs :
(a) It must provide varying gear ratios. Number of gear ratios are equal to
number of gears in a vehicle.
(b) It must provide a reverse gear for moving vehicle in reverse direction.
(c) It must provide a neutral or disconnecting arrangement so that the
engine can be uncoupled from the wheels of the vehicle. In a
conventional transmission system, there is a clutch, a manually
operated transmission (gear box), a propeller shaft and a differential
or final drive.
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