The double speed switch has the advantages of simple structure and good transmission effect.
这种结构的双速开关结构简单、传动效果好。
The speed-ratio curve of double-action parallel indexing cam mechanism has special property in shape, which makes it is not available from present transmission function, but designed purposely.
双作用式平行分度凸轮机构对速比曲线的几何形态有特殊要求，这使得该机构的速比不能从同类机构现有运动规律中得到，而必须经过特殊设计。
Transmission gear shift part USES single whirlpool and double whirlpool shift, exchange frequency conversion, in order to obtain consecutive speed.
传动变速部位采用单蜗、双蜗变速，变速均匀连续。
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