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In planetary gear systems of high power density and high gear ratio, helical gears create undesirable tilting moments on the planet gears; therefore, spur gears are still preferred for planetary gears -- a special challenge with respect to noise. Specifically, the different behavior of planetary gears with sequential and symmetric gear mesh is explained in this paper.
Durability requirements must be balanced with the need for lightweight and low-cost solutions which meet noise and vibration
targets whilst also exhibiting excellent efficiency.