Automobile Engineering in ME
The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft
Reduce vibrations caused by the crankshaft rotation
Adjusts the timing of the intake and exhaust valve openings
Balance the timing in the movement of the two groups of pistons

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Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Makes the steering more responsive
Reduces the amount of kickback for large steering angles
Allows the steering wheel to be turned by a greater amount when steering
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion

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