车用柴油机台架磨合过程影响因素研究——表面粗糙度对磨合过程的影响

Study on Running-in Process of Vehicle Diesel Engine on Bench——Effect of Surface Roughness

利用MOA原子发射光谱分析仪、分析铁谱仪和TR200表面粗糙度仪，在其他台架磨合试验条件相同的情况下，研究CA6110Z-07Y柴油机主要摩擦副缸套-活塞环、主轴瓦和曲柄销轴瓦的不同表面粗糙度对柴油机台架磨合过程的影响。试验结果表明，当活塞环的初始表面粗糙度Ra小于0．4μm、缸套的初始表面粗糙度Ra小于0．75μm时，能够有效改善柴油机缸套-活塞环台架磨合质量，当主轴瓦和曲柄销轴瓦的Ra小于0．5μm时，能够有效改善柴油机轴瓦-轴颈台架磨合质量，能够缩短柴油机台架磨合时间，并且柴油机摩擦副中主要磨损元素Fe、Cu、Al和Pb的含量在25～35min均处于平衡状态。

Based on the same testing condition and using MOA atom emission spectrometer, TR2000 surface roughness tester and ferrography tesler, this article studies the running-in process of CA6110Z-07Y-type diesel engine on bench at different surface roughness on cylinder, piston ring, main bearing shell and crank pin bearing shell. The testing results show that the quality of cylinder and piston ring running-in of diesel engine is improved when the original surface roughness of piston ring is less than 0.4 μm, and that of cylinder liner is less than 0.75 μm. The quality of main bearing shell and crank pin bearing shell running-in is improved when the original surface roughness of main bearing shell and crank pin bearing shell is less than 0.5 μm, thus can shorten the diesel running-in duration. The fraction of wear element Fe, Cu, Pb and Al of the friction pairs keeps balance at 25 to 35 minutes running time.