这种片状齿轮应用非常广泛，一般应用在行星减速器行星齿轮是变速机构的基础。行星齿轮由一个太阳轮、若干个行星齿轮和一个齿轮圈构成。单排行星齿轮位于行星齿轮机构中心的是太阳轮，太阳轮和行星轮常啮合，两个外齿轮啮合旋转方向相反。

　　行星齿轮在结构、设计方面都有各自的特点。行星齿轮始终都是相互啮合的，换挡时，不需要滑移齿轮，所以摩擦磨损小，寿命也比较长。单排行星齿轮结构简单、紧凑，其承载能力强，可以获得多个传动比。

　　This kind of plate gear is widely used,and generally used in planetary reducer planetary gear is the basis of speed change mechanism.The planetary gear is composed of a sun gear,several planetary gears and a gear ring.The single-row planetary gear is located at the center of the planetary gear mechanism.The sun gear and the planetary gear are often meshed,and the two outer gears mesh and rotate in opposite directions.

　　Planetary gears have their own characteristics in structure and design.Planetary gears always mesh with each other.When shifting,there is no need to slip the gears,so the friction and wear are small and the service life is relatively long.Single-row planetary gear has simple and compact structure,strong bearing capacity and can obtain multiple transmission ratio.