摘要
因为盾构主减速机低速、重载的工作特点,工作时遇到的主要问题是齿轮发热严重及齿面点蚀甚至断裂。将减速机低速级太阳轮轮齿啮合过程离散化为20个啮合姿态,通过对齿轮热力耦合接触有限元模型进行仿真分析,研究温度场对齿轮动态啮合接触的影响。基于修正后的S-N曲线,将每个啮合姿态视为一个时间步,利用nCodeDesignLife分别计算了考虑和未考虑齿轮温度场影响的接触疲劳寿命。结果表明:齿轮啮合接触时,热力耦合接触应力值普遍大于非热力耦合接触应力,两者分布规律相似;计算低速级太阳轮疲劳寿命,热力耦合接触疲劳寿命为常规接触寿命的0.74,齿轮的温升对齿轮的接触疲劳寿命存在较大的削弱作用。
Due to the low speed and heavy load,severe heat and gear contact fatigue failure become serious problems for shield main reducer.The meshing process of a planetary reducer was discretized into 20 meshing attitudes.Through simulation analysis of the thermal-mechanical coupling finite element model of the gear,the influence of temperature field on the dynamic meshing contact of gears was studied.Based on the modified S-N curve,each engaging attitude was regarded as a time step,andcontact fatigue life with and without consideration of gear temperature effects was estimated using nCodeDesignLife.The results show that when the gears are in contact,the thermal-mechanical coupling contact stress is generally greater than the non-thermal-mechanical coupling contact stress,and the two calculations are generally similar;the thermal-mechanical coupling contact fatigue life of the low speed planetary gear is 0.74 times of the normal contact life,the gear temperature rise greatly reduces the contact fatigue life of the gear.
作者
闫利鹏
YAN Lipeng(China Railway Construction Kunlun Metro Investment and Construction Management Co.,Ltd.,Chengdu Sichuan 610040,China)
出处
《机床与液压》
北大核心
2021年第14期60-65,123,共7页
Machine Tool & Hydraulics
基金
中国铁建昆仑投资集团有限公司科技研发计划项目(KLTZ-KX01-2020-003)。
关键词
主减速机
齿轮啮合
热力耦合
疲劳寿命
Main reducer
Gear meshing
Thermal-mechanical coupling
Fatigue life
作者简介
闫利鹏(1979-),男,硕士,高级工程师,从事城市轨道交通工程研发工作。E-mail:3512114972@qq.com。
