Fundamental analysis of a Cycloid Ball Reducer (5th Report) - Development of a two stage type reduction mechanism

The motion of a two stage type Cycloid Ball Reducer is analyzed. The fundamental reduced element of this reducer consists of three components; two surface grooved discs and a train of balls. One of the discs has an epi-trochoidal wave groove on one side surface while other disc has a hypo-trochoidal wave grooves. These grooves are just like a grooved cam mechanism. Also, they are arranged face-to-face with each other, and balls are located which transmit the torque between these discs. Especially, to eliminate the eccentric excitation which is caused by eccentric motion, this newly proposed mechanism has the special transmitting element which locates between the fundamental reduced elements. In this paper, the motion principle is analyzed using the polar complex vectors analysis. Also the design parameters are investigated. It is proved that the proposed reducer has a constant velocity rotation characteristic in motion principle. Then using the prototype reducer, the positioning accuracy and the backlash characteristic have been verified.