Gear is the core component of mechanical transmission system,and pitting and wear are its main failure forms.In order to solve the problem that the time-varying meshing stiffness and dynamic characteristics of double involute gear are unknown when pitting failure occurs.The meshing stiffness of double involute gear with pitting corrosion was calculated by using the percentage of contact line method,and the correctness of the algorithm was verified through finite element method.Firstly,the different erosion conditions were categorized and the influence of different number of pitting on the contact line length was analyzed.Then,based on the method of the percentage of contact line,the ratio relationship between tooth load and tooth deformation was used to solve the meshing stiffness of gear at different points of erosion.The correctness of the algorithm was verified by finite element method,and the influence of pitting on meshing stiffness of double involute gear and ordinary involute gear was compared and analyzed.Finally,the flexible multi-body dynamic models of the two gears were established,and the dynamic characteristics of the two gears under different corrosion conditions were analyzed based on the impulse function method.The research results show that,under the same working conditions,with the deepening of pitting corrosion,the meshing stiffness of both types of gears continuously decreases,while the dynamic meshing force and vibration angle acceleration amplitude increase.Among them,the maximum meshing force of double involute gear is 1.24×105 N,and the maximum angular acceleration is 2.66×106°/s2.Comparing with ordinary involute gear,the meshing stiffness of double involute gear under the influence of pitting corrosion is more stable,the acceleration amplitude fluctuates more gently,and it has better impact resistance and power transmission stability.
关键词
机械传动系统/齿轮传动/点蚀与磨损/接触线长度/啮合刚度/动力学特性
Key words
mechanical transmission system/gear transmission/pitting and wear/length of contact line/meshing stiffness/dynamic characteristics
维普
万方数据