Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Can deal with movement of the suspension both vertically and in other directions
Reduce the amount of sliding resistance
Reduce the amount of noise generated
Improve the force transmission speed

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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

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

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