缸套预紧变形及结构影响因素研究  

Study on Cylinder Liner Pretightening Deformation and Influence of Structure Factors on It

作　　者：毕玉华[1] 申立中[1] 雷基林[1] 徐远志[1] 贾德文[1] 

机构地区：[1]昆明理工大学云南省内燃机重点实验室,昆明650500

出　　处：《内燃机工程》2013年第5期62-68,共7页Chinese Internal Combustion Engine Engineering

基　　金：云南省科技强省计划项目(2007AD005);科技部科技人员服务企业行动项目(2009GJF30001)

摘　　要：基于弹性力学理论与非线性接触理论,建立机体-缸盖-缸套的装配耦合模型,在预紧工况下进行装配体的静力分析,研究了缸套变形特点,并应用正交设计试验法,研究了结构因素对缸套变形的影响。研究结果表明:预紧工况下各缸缸套整体呈现上部截面收缩变形,中下部截面扩张变形,最大变形位于各缸缸套的上部;受机体结构刚度不均匀的影响,各缸缸套变形不均匀,2、3缸缸套变形相似且变形相对较小,1、4缸缸套变形相似且变形相对较大;1、4缸缸套对应自由端的变形相对较大;结构因素中,对缸套变形的影响较大的是螺栓沉孔深度与缸套壁厚,在相同预紧力下,沉孔深度的增加使机体顶面变形变小,但使缸套最大膨胀变形量增加,随着缸套厚度减小,截面收缩变形增大,截面膨胀变形减小。The coupling model of cylinder block-head-liner assembly was established based on the elastic mechanics theory and the nonlinear contact theory. Then static analysis of the assembly was carried out in pretightening condition to research cylinder liner deformation characteristics, and structure factor influence on liner deformation was also studied by using orthogonal design method. Results indicate that each cylinder liner deformation presents shrinkage in upper cross- section, expansion in middle and lower cross-sections ,and the maximum deformation is located in cylinder liner top;influenced by unevenness of block local rigidity,the each liner deformation is different,deformations of second and third liners are similar and relatively smaller, deformations of first and fourth liners are similar and relatively larger and largest deformations at their free end;among various structural factors,screw hole counter bore depth and liner wall thickness have greater influence on liner deformation ;as the counter bore depth increases, the block top surface deformation becomes small, while the biggest liner expansion deformation increases in the same pretihgtening condition, and as the liner thickness decreases the cross-section shrinkage deformation increases and the expansion deformation decreases.

关 键 词：内燃机 缸套 预紧变形 正交设计 结构因素 

分 类 号：TK423[动力工程及工程热物理—动力机械及工程]