Helical gear is most commonly used gear in all automobiles(low power), double helical gear is used in heavy power automobiles like suv.
Spur gear is simple to design but it is not used because of heavy impact stress so spur gear are used in watch or low rpm low load conditions.
Spur gears are used almost exclusively in rack and pinion steering. The forces on the rack are not particularly high and don’t normally require helical gears.
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