A novel approach to design a pure rolling cycloid reducer with involute teeth superimposed

A novel pure rolling cycloid planetary gear reducer is presented in this paper. It has a character of pin wheels pure rolling. It can eliminate the sliding friction between pin wheels and gears, gain high transmission efficiency. The motion status of pin wheels in traditional dual-cycloid gear reducer is analyzed in detail. Under the condition of pin wheels pure rolling, novel profiles of epicycloid and hypocycloid gears are designed. And then small involute teeth are added on the profiles, in order to constrain the tangential displacement of pin wheels. In addition the pin wheel frame which is used in the traditional dual-cycloid gear reducer can be discarded to simplify the structure. At last, validity and feasibility of the approach to the pure rolling cycloid gear reducer are testified by kinematics simulation.