A small switching gear, a contrate gear shaft respectively fixedly connected with a big chain wheel and a big gear, a speed change gear set and a generator set are arranged in the casing.
外壳内，设有小切换齿轮、分别与大链轮和大齿轮固连的端面齿轮轴、变速齿轮组和发电机组。
To change the gear ratio, most automatic transmissions use planetary gear set.
为了能够改变变速器的传动比，大多数自动变速器使用了行星齿轮机构。
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