They also possess the ability to a much smoother and quieter running. Helical gears, therefore, tend to have greater load-carrying capacity compared with spur gears which material, quality of manufacture, lubrication, type of loading, and other factors are the same.
For helical gears the total contact ratio is higher owing to the axial tooth overlap. The helical gears offer considerable advantages for high speed and heavy-duty gear drives. Cylindrical gears are essential machine elements and widely used in many fields, such as wind power, coastal ships, automotive products, and general gear boxes.
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