摘要
以SCR尾气排放系统中的尿素泵(主要结构为一对相互啮合的摆线齿轮,材质为PEEK)为研究对象,应用有限元的思想方法,结合通用有限元分析软件ANSYS,分析了泵在运转过程中的内外转子的应力和应变状况。通过研究表明:转子受到两种负载,分别是作用在内转子上的输入轴产生的转矩和齿间各封闭腔中液体产生的液压力。同时发现:齿间压力分布并不是均匀的,应变大小和变形的趋势也是不同的。因此,产生了齿间的轴向间隙以及泵体和转子的径向间隙,导致泵的内部泄漏加剧,严重影响泵的工作压力、容积效率和寿命。阐述了一种如何确定泵的输入转矩范围的方法,转矩产生的应力σ2不能大于压应力σ2(为PEEK的极限压应力Re),即σz≤σc≤Re。同时,轴向间隙ha和径向间隙hr不能超过特定型号所规定的最大轴向间隙hamax和径向间隙hrmax,即ha<hamax,hr<hrmax。
Using the urea pump（a cycloid pump） of SCR exhaust emission system as the object of study,the stress and deformations of the pump during the operation process by using the finite element method and the ANSYS program are analyzed.According to the research,it shows that the two kinds of load which the rotor received are respectively the torque of the input shaft of the inner rotor and the hydraulic load resulted from the pressure of the liquid between the tooth displacement chambers.The tooth stresses are not even and both the strain and deformation trends are different are also discovered.Therefore,the axial gap between teeth and radial clearance between the pump body and rotor occur which leads to the internal leakage of pump and seriously influence the pump working pressure and the volume efficiency and life of the pump.Least but not last the paper illustrates a way to determining the load range for pump： the loading of the pump should not higher than stress（equal to the maximum pressure stress of PEEK,that is,and at the same time,the radial clearance and the axial clearance should not exceed the extreme values and assumed for a particular size of the pump,that is and.
出处
《机械传动》
CSCD
北大核心
2013年第1期25-28,共4页
Journal of Mechanical Transmission
关键词
尾气排放
摆线泵
应力
应变
FEA
Exhaust emission
Cycloid pump
Stress
Deformation FEA
