Abstract: On the basis of the analysis of existing ring-reducer principle and its disadvantages, a new ring-reducer with small tooth number difference parallel movable axis, which consists of two stage transmissions—cylinder gear transmission and double-ring reducer transmission, is first proposed.The principles and features of the new two-stage coaxial ring-reducer are analyzed, and load-carrying capacity of the reducer is calculated. Moreover, the whole system dynamic behavior is simulated by considering the non-linear coupling characteristic, this dynamic model also takes into account the inner excitation. Finally, The physical prototype of the new structural is manufactured and tested to verify its rationality.

Key words: Dynamic, Experimental testing, Ring reducer, Substructure