Transmission Error Analysis Of Double Crank Four-Ring-Plate Pin-Cycloid Reducer Driven By Three Gears

The thesis is based on the national nature scientific fund organized project-double crank ring-plate-type cycloid drive which have high load-capacity, high transmission efficiency and high reliability. It's about transmission error analysis of double crank four-ring-plate pin-cycloid drive driven by three gears.Double crank four-ring-plate pin-cycloid drive driven by three gears is a new-type of drive. After analyzing the merits and the drawbacks of involute-gear ring flat-plate drive and traditional cycloid drive respectively, we proposed the double crank four ring flat-plate pin-cycloid drive, which possess the merits of small volume, light weight, wide range of drive ratio, high efficiency, uniform operating, well knit-structure, high load-capacity. With the further research on the performance of this kind of reducer, we should analyze its driving errors, because it's an important index in evaluating driving accuracy and operating smoothness for a reducer, and it's also necessary for improving machine performance further and for a wider application of this kind of machine.On the basis of the gear meshing theory, the article analyzes the influences of fabricating errors on driving accuracy of the whole reducer without working load. Considering the structure of the reducer, by using equivalent effect principle of error which bases on independent principle of error, we compute the driving error of the first involute-gear drive with a statistical method. The influences of the output-angle error generated by the second pin-cycloid drive part on driving error of the whole reducer are great. The method adopted is that, building up a coordinate system considering all errors with analysis, defining the driving process mathematically, building a model that can compute output-angle error instantaneously; and then making a program to compute to find the maximal error; finally drawing the graph of output-angle error by drawing software with the data computed above. It's a visual way to know instantaneous value of output-angle error. More importantly this method takes error-correlation into account. The driving error of the whole reducer is the sum of that of the two driving parts.In addition, we should make the curves reflecting influences of every individual error on the maximal output-angle error when they varies within their tolerance zones, which is done when considering all the other driving errors, that is also to say considering error-correlation, therefore we can know the influences of a individual error on output-angle error. At the same time, we can design tolerances of every dimensions related according to the variation law of the curves, thus the driving errors can be limited within their allowable ranges and therefore made the tolerances selection reasonable further.