传动比变化范围大，特别是采用行星传动时，传动比可到100 ~ 200(单级)，适用于减速或增速传动。

Change gear ratio range, in particular, using planetary transmission, the transmission ratio can be up to 100 ~ 200 (single stage), the growth rate for slow down or drive.

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齿轮传动主要是通过齿轮的啮合作用来传递动力及实现减速、增速或换向的目的。

Gear power transmission is mainly through gear meshing to transmit power, realizing reducing and increasing speed or changing direction.

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