Research Of Cycloidal-Pinwheel Transmission And Small-Sized RV Reducer With Two Stages

Cycloidal pinwheel transmission and RV transmission, both of which are important ones among planetary gear reducers, are widely applied for industrial fields because of their advantages such as high transmission ratio, high precision, high stiffness, etc.In this paper, the mending tooth shape of cycloid gear tooth profile is researched, the mathematical model of positive equidistance and moved distance is established, the computer optimization of parameters of mending tooth shape is realized, a Matlab optimization program is composed, and a good result is obtained.Besides, according to cycloid tooth profile and the meshing characteristics and requirements of cycloid planetary transmission, a new method of cycloid gear modification is presented in this paper. The compound cycloid gear profile that we get from this method is constituted of work section, non-work section of gear root and non-work section of gear top. The feature is that the work section is a strict conjugate gear profile, while proper clearance is set aside in the non-work sections. The mathematical solution model is proposed, at the same time, a solving program of the model is compiled. An example is given in the end. The backlash can be reduced by using this method, which also can enhance the meshing performance of cycloid pin gear transmission.In addition, the feasibility of non-pin cycloid transmission is analyzed according to the two ways of formation of cycloid. And a computer graphic method is presented that the determination of optimum cycloid gear profile pin shell is depended on parameter search and image recognition. The program of the method is established and an example is given.At the same time, a small-sized RV reducer with two stages, is a new configuration presented in this paper according to the special requirements of some spacecraft actuator reducer. It is constituted of primary RV deceleration mechanism and primary cycloid pin gear transmission structure. It will keep its high stiffness, high strength and high precision on the premise that it guarantees the requirements of its reduction ratio and size.The theoretical analysis of the small-sized RV reducer with two stages is made in detail, and the formula of transmission ratio is deduced, the dimention of each part is determined, and the theoretical efficiency is calculated. Also, the strength of key parts is checked, and the backlash of the prototype is calculated. The 3D model and 2D engineering drawings of the small-sized RV reducer with two stages are established, which is a preparation for follow-up machining. Preliminary kinematical simulation of the small-sized RV reducer with two stages is made by using virtual prototype, and improved scheme of the kinematical simulation is presented. In the end, the work in this paper is summarized, and also an extended scheme of involved but unstudied late contents is presented, which lays the foundation for long term development of decelerating transmission equipments.