摘要
基于制造效率和成本的平衡考虑,发动机曲轴的轴颈圆柱度不可避免地产生公差,从而对轴承副润滑状态、摩擦功耗和服役性能产生重要影响。本研究针对某三缸发动机,基于弹性流体润滑(EHD)理论分析曲轴主轴颈圆柱度对主轴承润滑性能的影响。首先将主轴颈圆柱度分解为沿轴颈径向的圆度和轴向的腰鼓度及轴心直线度,通过Kriging方法建立形位尺寸与轴承摩擦功间代理模型;然后基于遗传算法进行优化求解,进而评估轴颈圆柱度尺寸在公差范围内对轴承润滑的影响规律。结果表明,轴颈圆柱度对于轴承润滑状态有重要影响,在公差范围内会使得轴承摩擦功明显增大,但是提供了轴承润滑状态小幅度改善的可能性。其中腰鼓度的影响最大,使得轴承摩擦功变化27.7%;直线度的影响次之,导致摩擦功变化18.9%;而轴颈圆度的影响十分微小,仅为3.1%。
Manufacturing tolerance of journal cylindricity is inevitable with the consideration of manufacturing efficiency and cost.Based on the elastohydrodynamic (EHD)theory,effects of cylindricity for main journals in a three -cylinder engine on bearing lubrication are analyzed.In this study,cylindricity of main journal is equivalent to degree of barrel and straightness of journal center along the axial direction and roundness along the radial direction.The kriging method is used to establish the agent model between the geometric dimensions and bearing friction loss.And based on genetic algorithm,the influence of geometric dimensions on bearing lubrication is obtained.The results show that the journal cylindricity has an important influence on the lubrication of engine bearing.Within the tolerance range,the friction loss of the bearing will increase significantly,but it may also lead to a slight improvement in the lubrication of bearing.And the maximum influence of straightness is 18.9%,while the effect of roundness is very small,only 3.1%.
作者
袁志远
顾廷昶
王宝
YUAN Zhiyuan;GU Tingchang;WANG Bao(School of Mechanical Engineering,ShanghaiJiao Tong University,Shanghai 200240,China;SAIC General Motors Corporation Limited,Shanghai 201201,China)
出处
《机械设计与研究》
CSCD
北大核心
2019年第1期105-109,117,共6页
Machine Design And Research
基金
上海汽车工业科技发展基金资助项目(1614)
