這種片狀齒輪應用非常廣泛，一般應用在行星減速器行星齒輪是變速機構的基礎。行星齒輪由一個太陽輪、若干個行星齒輪和一個齒輪圈構成。單排行星齒輪位于行星齒輪機構中心的是太陽輪，太陽輪和行星輪常嚙合，兩個外齒輪嚙合旋轉方向相反。

　　行星齒輪在結構、設計方面都有各自的特點。行星齒輪始終都是相互嚙合的，換擋時，不需要滑移齒輪，所以摩擦磨損小，壽命也比較長。單排行星齒輪結構簡單、緊湊，其承載能力強，可以獲得多個傳動比。

　　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.