The power generated in the engine of the automobile is sent to the wheels for their movement with the help of transmission. The basic functions of transmission are:
- To transfer the engine output power to the final driven gear.
- To provide sufficient torque at starting, ascending, accelerating, braking etc.,
- To provide low to high-speed driving capability, and
- To change the direction of wheel rotation (forward or reverse).
The engine rotation is transmitted to the transmission main shaft through the action of a clutch. This main shaft then drives a countershaft using a set of meshing gears which are selected by the gearshift lever. The countershaft's output gear transfers the motion to the differential assembly final gear, and the differential transmits it to the left and right driveshafts. These shafts ultimately turn the left and right wheels respectively.
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