一种大传动比的变速机构设计

A design of gearing device with high transmission ratio

应用行星轮系理论而设计的一种大传动的变速机构，其传动比的大小由行星齿轮的齿数而决定。当行星齿轮的齿数比大于２ 时，传动比小于１ ，传动自右到左为增速；当齿数比小于２ 时，传动自右到左为减速；当齿数比趋向１ 时，传动比理论上趋向无穷大。所以，此种变速机构可通过调整齿轮齿数设计出各种传动比，既可作减速机构，也可作加速机构。它最适合于大传动比、小功率的场合，该变速机构在机械传动式远距离高压水力喷砂带火切割装置中作为减速机构的运用中，证明它是一种设计合理、操作轻便、体积小且具有很大的实用性的变速机构。

A kind of gearing device with high transmission ratio was designed by using planetary gear theory,its transmission ratio depends on the number of teeth of planetary gear.When the teeth ratio of planetary gear is greater than 2 and transmission ratio is less than 1,the transmission will be speeded up from right to left.When the teeth ratio is less than 2,transmission will be slowed down from right to left,and when the teeth ratio is becoming close to 1,transmission ratio will trend towards infinity theorically.Therefore,this device can give a variety of transmission ratios by changing the number of teeth of planetary gear,and it can not only works as a slowing down mechanism,but also works as a speeding up mechanism.It is very useful when big transmission ratio and low horsepower are needed.This gearing device used as slowing down equipment in far distance,high pressure hydraulic sand jetting device,which proves the gearing device has advantages of design reasonableness,easy operation,small volume and wide practicality.