In an automatic transmission, however, the gears are never physically moved and are always engaged to the same gears. This is accomplished through the use of planetary gear sets.
但是，在自动变速器里，齿轮不需要滑动，所有齿轮相互之间保持啮合状态，换挡是通过行星齿轮的控制来实现的。
Following is the important part of automatic transmission: planetary gear sets.
下面就是自动变速器的最主要的机构------行星齿轮机构。
The type spectrum and the method based on the matrix and MATLAB offers new approaches to the research of the complex planetary gear transmission and the design of the automatic transmission.
该型谱和基于矩阵与MATLAB的传动分析方法，为研究复杂行星齿轮机构和设计汽车自动变速器提供了新的途径。
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