齿根裂纹几何参数对齿轮强度影响的研究  

Study on Influence of Geometry Parameters of Tooth Root Crack Upon Gear Strength

作　　者：余清[1] 朱江新[1] 黄伟[1] 吴海浪[1] 

机构地区：[1]广西大学机械工程学院,广西南宁530004

出　　处：《机床与液压》2014年第23期137-139,共3页Machine Tool & Hydraulics

基　　金：国家科技支撑项目(2012BAF02B02)

摘　　要：在工程机械再制造过程中，齿根裂纹特征作为齿轮失效的主要检测依据之一，直接决定齿轮回收件的再制造处理方案。提出了基于缺陷建模的齿轮强度分析方法，根据齿轮回收件裂纹统计情况，设计了一组裂纹特征的几何参数，并使用齿根裂纹建模技术将其引入到齿轮副模型中，使用Ansys系统进行有限元静力分析，得到了齿轮内部最大等效应力随裂纹几何参数的变化曲线。结果表明：与无裂纹时齿根受拉侧最大等效应力108 MPa相比，裂纹处的最大等效应力变化范围为301～890 MPa，齿根裂纹有明显的应力集中作用；在相同几何参数条件下，中部裂纹处的最大等效应力大于端部裂纹处的最大等效应力，中部裂纹对应力集中的影响较大；裂纹最大等效应力随深度变化曲线斜率比随长度变化曲线斜率大，裂纹深度对最大等效应力的影响比裂纹长度强。In the remanufacturing process of engineering machinery, the characteristic of tooth root crack is treated as a main test standard for gear failure, which directly decides the remanufacture processing scheme for recycled gears. A gear strength analysis meth-od based on crack modeling was introduced. According to the crack-s statistics in recycled gears, a series of geometrical parameters of the crack characteristic were designed and introduced into gear pair models with the modeling technique for tooth root crack. These models were analyzed in static status by finite element analysis （ FEA） method using Ansys system. The curves that described the rela-tion of maximum equivalent stress-Von Mises in the gear interior with the crack geometrical parameters were obtained. The results show that as compared with the Max. Von Mises 108 MPa at pulled side of tooth without root crack, the variable range of Von Mises at place of crack is 301-890 MPa, which shows obviously concentration effect of stress with tooth root crack. Under the condition of same geo-metrical parameters, the Max. Von Mises at middle place of crack is larger than that of at end place, and the middle place of crack has larger influence on stress concentration. Curvature of curve of change along depth is larger than that of length by the Max. Von Mises of crack, and the depth of crack has stronger influence than that of length on Max. Von Mises.

关 键 词：齿根裂纹 齿轮回收件 几何参数 等效应力 

分 类 号：TH-132[机械工程]