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

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

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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

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

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