stepped gear ratio
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二级传动比调档 shifting in both ratios
·2,447,543篇论文数据，部分数据来源于NoteExpress
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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