双输入行星减速器关键零件校核及评判方法研究

针对某航天飞行器的要求,设计出双输入行星减速器,分别用传统方法和有限元软件对其受载最大的齿轮进行强度校核。针对较大轴向载荷的存在,对减速器箱体进行了有限元强度校核和轴向刚度校核;完成了对减速器样机的承载能力试验和轴压试验,验证了校核的正确性。传统齿根强度校核方法基于材料力学的梁理论,将轮齿处理成单向受拉或受压的悬臂梁,而实际上每个点都处于三向应力状态,有限元计算得到的Von-Mises等效应力基于第四强度理论,能更好地作为校核的准则。

Research of the Checking and Judging Method of the Key Parts of the Double Input Planetary Reducer

According to the requirements of a spacecraft,a double input planetary reducer is designed,and the most loaded gear is checked using traditional methods and finite element software.Due to the existence of a large axial force,the finite element strength check and axial stiffness check of the reducer box are completed.Bearing capacity test and axial stiffness test of the reducer is completed to verify the correctness of the check.The traditional gear root strength checked method is based on the beam theory of mechanics of materials.The gear teeth are treated as cantilevers with unidirectional tension or compression,but actually,each element is in three dimensional state of stress.The Von-Mises equivalent stress obtained by finite element method,which is based on the fourth strength theory,can better serve as a check criterion.