If either the number of sun or ring gear is not multiple of planet gear, system will run effectively, with lower impaction of tooth mesh in and out.
行星轮与内齿圈齿数不为行星轮个数的整数被时，轮齿的啮入、啮出对系统的冲击小，系统的效率高。
2
A planetary gearbox for a Marine propulsion unit or an earth moving unit, comprises a hollow wheel gear 1, two or more planet gears 2, and a sungear 3.
One or more of the hollow wheel gear, two or more planet gears, andsungear comprise a plurality of teeth 4 that have been superfinished to a final surface roughness of 0.25 micron or less.