Planetary gear transmission systems are commonly used in high-precision and high reliability deceleration situa-tions.During the transmission process,the interference fit surface between the planetary gear and its bearings is prone to mi-cro-slip,causing periodic changes in the local stress state,leading to micro-cracks,which in turn exacerbates micro-wear and ultimately result in cracks and micro-fatigue damage.Though contact finite element calculation with Ansys Workbench soft-ware,the slip amount and stress distribution of the mating surface between the inner hole of the planetary gear and the outer ring of the bearing were obtained.The slip values corresponding to different interference amounts and the influence of inter-ference amounts on the micro-slip of the mating surface was analyzed.The results show that under the rated load,as the ini-tial interference amount increases,the radial stress on the mating surface of the planetary gear inner hole and the bearing out-er ring increases,while the maximum slip amount gradually decreases;when the interference amount exceeds a reasonable range,further increase in its value will lead to stress concentration on the interference fit surface,and the changing trend of micro-slip will reverse.Therefore,the selection of the optimal interference amount has a significant impact on the micro-slip phenomenon.Under the premise that the transmission torque is met,selecting the most suitable interference amount can ef-fectively reduce maintenance frequency and operating costs,so as to improve the service life of planetary gears.
关键词
微动滑移/NGW行星轮/过盈配合/有限元分析
Key words
micro-slip/NGW planetary gear/interference fit/finite element analysis
维普
万方数据