Study On Transmission Performance Of Co-axial Counter-rotating Planetary Reducer

In order to satisfy the requirements of the propulsion system of Underwater Unmanned vehicle (UUV), various transmission mechanisms have been investigated. The compound epicyclic gearing composed by a fixed-shaft and differential gearing is proposed to apply into the propulsion system. This epicyclic gearing can transform one input into two counter-rotation outputs with equal torques and speeds. On the basis of the design of geometric parameters of the compound epicyclic gearing, structural design of the reducer is finished. Primary parts of the reducer are analyzed by means of FEM, which can provide a base of the manufacture of the gearbox.This thesis consists of following parts:①After some transmission mechanisms are compared, the compound epicyclic gearing composed by a fixed-shaft and differential gearing is proposed to apply into the propulsion system of UUV. This epicyclic gearing can reduce one high-speed input into two low-speed counter-rotation outputs.②On the basis of the analysis method of the power flow in differential gearing, the characters of power flow of this counter-rotation drive is determined. After comparing the power distribution of input flow, the condition of this gear train without circulation power is investigated. Proportional relationship of power-flow in the fixed-shaft and differential gearing is obtained.③The geometric parameters of the compound epicyclic gearing are designed. The contact and bending strength of the fixed-shaft and differential gearing are checked.④Finite Element Method (FEM) is applied to analyze the deformation and stress of the output ring gear and output carrier. According to the strength theory, the safety of the ring gear and carrier is acquired.⑤Due to the limiting factors of the noise and temperature increase of the propulsion system of UUV, appropriate measures of improving the quality of the reducer is suggested.