船用二冲程柴油机十字头轴承润滑分析  

Lubrication Analysis of Crosshead Bearing of Two Stroke Marine Diesel Engine

作　　者：武起立[1] 林叶春[1] 魏立队[1] 刘冲[1] 李精明[1] 段树林[2] 

机构地区：[1]上海海事大学商船学院,上海201306 [2]大连海事大学轮机工程学院,辽宁大连116026

出　　处：《润滑与密封》2016年第12期68-73,共6页Lubrication Engineering

摘　　要：根据动载滑动轴承弹流润滑相关理论,将有限元法与非线性多体动力学相结合,计入摩擦表面的粗糙度、轴瓦与轴颈的弹性变形、供油特性等因素,分析船用二冲程柴油机十字头轴承润滑状况。结果表明,在整个工作循环内,十字头轴承始终受压,承受压应力;轴承载荷的峰值出现在缸内气压最大的时刻;十字头轴承轴心的运动轨迹始终坐落于下半区域的较小范围内,高油压区域相对集中;轴承下瓦开设油槽,降低了承压能力,峰值油膜厚度较小;在轴承摩擦面的光洁度很高的情况下,粗糙接触压力较小且持续时间短,对轴承的正常工作影响不大;整个工作循环内绝大部分为液动摩擦,粗糙接触摩擦功耗相对较小。According to the elasto-hydrodynamic lubrication theory of bearing, combined with finite element and nonlin- ear multi-body dynamics, the lubrication conditions of the crosshead bearing of marine diesel engine were analyzed by con- sidering the effect of friction surface roughness, bearing and shaft neck elastic deformation, oil supply characteristic etc.The results show that in a working cycle, the crosshead bearing is always under compression.The peak value of the bearing load appears at the maximum pressure in the cylinder.The movement track of the axis of the crosshead bearing is always located in a small region of the lower shell.The area of high pressure of oil film is relatively concentrated.There are oil grooves in the lower shell, which reduces the loading capacity of bearing and makes the minimum oil film thickness be small.The as- perity contact pressure is small and of short duration with the high smooth degree of friction surface, and the bearing can work normally.In a working cycle, the majority of friction is hydraulic friction power, and the rough contact friction power is relatively small.

关 键 词：船用柴油机 弹流润滑 十字头轴承 轴承润滑 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程] TH117.2[机械工程—机械设计及理论]