Series Design And Prototype Manufacture Of Novel Double-Ring Gear Reducers

In this thesis, a novel double-ring gear reducer (DRGR) is designed to solve the problems of complicated structure, premature fatigue of planetary bearings, and strong vibration and noise in multi-ring gear reducers. The unique features of this novel reducer are that the phase angle difference between two parallelogram mechanisms is a little less than 180 degree and four well-designed counterweights are fixed to the high-speed crankshafts to eliminate the unbalanced shaking force/moment.The major achievements of this thesis are as follows.By considering the elasticities of high-speed shafts, gear-couplers, meshing teeth and bearings as well as additional rotation of the supporting shaft, the compatibility conditions of elastic deformations are derived, and an elasto-quasi-static model is developed for the novel DRGR.By solving the system's governing equation, the loads acting on gears and bearings are obtained and further introduced into the strength/rating life calculation of key parts. In the process of the bending strength calculation of gears, the positive effect of multi-teeth-contact is taken into consideration, which is a special phenomenon in internal gearing with small tooth number difference. With these work, a serial design of the novel DRGR is carried out for future industrial application.And finally a prototype of the novel DRGR is designed and manufactured. The concerned experiments are to be carried out.The aforementioned research will provide theoretical and technical guidelines for the future application of this novel transmission.