Design Of A Novel Cycloid Gear Reducer

Cycloid gear reducer shows high efficiency when has a big transmission ratio which is an advantage that involute gear reducers don’t have. In addition, cycloid gear loaded by pressure can withstand greater mechanical stress and deformation than the involute gear reducer loaded by shear stress. In this paper, the development and application of cycloid gear reducers in the domestic and abroad had been discussed and the necessity of the design of novel cycloid gear reducers had been analyzed.Firstly, the double cycloid gear reducers’ principle had been analyzed in this paper. And the problem that the length of the epicycloidal gear’s tooth is not equal with the length of the hypocycloidal gear’s tooth was pointed out. Because of the problem, slide will occur during the meshing between the pins and the cycloid gears. In order to solve the problem, a novel cycloid gear reducer was designed under the condition that the length of the epicycloidal gear’s tooth equals the length of the hypocycloidal gear’s tooth. And small teeth were designed on the profile of the cycloid gears which can eliminate the use of pin-wheel. The novel reducer has smaller axial size and less parts than the old ones.Secondly, Mathematica was used to design cycloid small teeth and circular arc small teeth on the profile of the epicycloidal gear and hypocycloidal gear. The results of the calculation in the Mathematica were stored in text files which can be read by the Pro/E during the design of the 3D model of the new reducer. In addition, the simple volute small teeth were designed on the profile of the epicycloidal gear and hypocycloidal gear by using the parameterized modeling method of Pro/E and the 3D model of the reducer was designed. Then, the feasibility of the new reducer was testified using ADAMS to do the kinematics simulation.In order to design the involute small teeth on the profile of the epicycloidal gear and hypocycloidal gear, the graphing method, tooth shape normal method, analytical method and convert-tooth shape method were discussed by referencing the design of the non-circular gears. A novel reducer was designed in the Pro/E by using the convert-tooth shape method to calculate the involute small teeth designed on the profile of the epicycloidal gear and hypocycloidal gear. In addition, the kinematic analysis was completed in the ADAMS which proved that the convert-tooth shape method was useful and reliable.Finally, two new cycloid gear reducers which have cycloid small teeth were designed and drew their two-dimensional engineering graphics in detail. Two new reducers were manufactured which proved that the new reducers with cycloid small teeth can achieve desired objectives and lay a solid foundation for the further research.