注：双级减速比由两单级速比组合而成，上表中未列出的亦可生产。
Note: The double step reducing ratio consists of the both mono-step reducing ratio. The unlisted on the above table also can be produced.
双级减速器除了存在单级的传动问题以外，还有外形尺寸协调、传动比分配、功率流分流及机构平衡等问题。
Besides existing the single transmission questions, two grades of reducer have other problems, such as dimension coordinate, transmission radio distribute, power flow direction and balancing.
测试结果表明：该两级同轴式双环减速机传动效率达到96%振动方面也有所改善。
The test result indicated that the two-stage coaxial double-ring reducer reached an efficiency of 96% and is improved on the vibration.
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