Power Transmission Engineering Magazine
www.powertransmission.com/articles/1296-dynamic-behavior-of-planetary-gears

Dynamic Behavior of Planetary Gears

June 1, 2020
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.