王星全1,2,张俊青1,2,徐涛1,2,王占宜1,2,夏金宝1,2，张新超1,2
1.滨州渤海活塞有限公司，山东滨州256602；2.山东省发动机活塞摩擦副重点实验室，山东滨州256602
摘要：以某高强化船用柴油机钢顶铁裙组合活塞为研究对象，分析活塞裙部型面的纵向中凸曲线和横向椭圆设计过程，运用有限元分析软件研究不同设计方案的活塞裙部接触压力分布并进行优化，通过合理调整不同位置的横向椭圆的椭圆度及修正系数得到最优方案，并对优化设计的活塞装机进行台架试验。研究结果表明：采用横向二次椭圆和纵向中凸曲线设计时活塞裙部的接触位置及接触压力更合理；经装机试验验证，活塞裙部与缸套的贴合较好，无异常磨损等现象，达到预期设计目标。
关键词：船用柴油机；组合活塞；裙部型面
Abstract:The design process of the longitudinal convex curve and the transverse ellipse of the piston skirt profile have been studied in detail on a combined piston with steel head and iron skirt, which is designed for dieseldriven offshore ship. The contact pressure distributions of different design schemes are analyzed and optimized by using the finite element analysis software.The optimal scheme is obtained by reasonably adjusting the ovality and correction coefficient of the transverse ellipse at different positions,and the bench test of the optimized piston machine is carried out. The results show that the contact position and pressure of piston skirt are more reasonable when the design is based on transverse quadratic ellipse and longitudinal convex curve, the fit between piston skirt and cylinder liner is good, and there is no abnormal wear and so on, which achieves the design goal.
Keywords:marine diesel; combined piston; skirt profile
|
