某船用大功率柴油机拉缸故障分析

针对某船用大功率柴油机运行过程中的拉缸故障进行拆检分析和有限元仿真研究.分析与研究结果表明:润滑油喷嘴堵塞影响了活塞热量散发和气缸套有效润滑,在高负荷下加速了零件磨损,进而导致拉缸故障.不同负荷下,活塞、气缸套和活塞环均向外部膨胀,活塞与气缸套间存在足够的热膨胀余量;而活塞环与气缸套间将出现过盈配合,在高负荷和润滑失效的情况下将导致拉缸故障.

Analysis on the Scuffing Failure of a Large Power Marine Diesel Engine

To deal with the scuffing failure during the operation of a large power marine diesel engine, the engine was disassembled and inspected, and finite element simulation study were carried out. The analysis and research results showed that the blockage of lubricating oil nozzle affected the heat dissipation of piston and the effective lubrication of cylinder liner, accelerated the wear of parts under high load, and finally led to scuffing fault. Under different loads, the piston, cylinder liner and piston ring expanded outward, and there is sufficient thermal expansion allowance between the piston and cylinder liner. Interference fit will occur between piston ring and cylinder liner, which will lead to scuffing failure under the condition of high load and lubrication failure.