A small switching gear, a contrate gear shaft respectively fixedly connected with a big chain wheel and a big gear, a speed changegearset 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。
2
To change the gear ratio, most automatic transmissions use planetary gear set.