Effects of Assembly and Manufacturing Errors on Transmission Error of Planetary Gears

Abstract

Abstract Transforming 2K-H type planetary gears with three planet gears into an equivalent model with many degrees of freedom, in a plane perpendicular to the input and output shafts, the loci of the displacement of a floating sun gear were analyzed theoretically by using the equivalent model. The theoretical locus of the displacement of the sun gear was nearly identical to the experimental one. K-H-V type planetary gears have been used as the reduction gears in the industrial robot, and have desired to decrease the transmission error between the input and output shafts for increasing the positioning accuracy of the robot. The K-H-V type planetary gears composed of a sun gear for the input, three planet gears, three crankshafts, two disks with cycloidal teeth, an internal gear with pin type teeth, and a carrier for the output were also transformed into the equivalent model in the same manner as the 2K-H planetary gears, and the effects of manufacturing and assembly errors of elements on the transmission error were determined theoretically.