为有效抑制柴油机缸内最高燃烧压力提高后气缸套变形导致的密封失效问题，以小排量3缸增压柴油机为研究对象，基于多体动力学理论，采用CAE分析方法，对比分析了增压前后气缸套位移、气缸套截面变形和气缸套止口平面度等参数的变化规律，并提出了控制缸套变形的可行方案与措施。结果表明：采用增压技术前后，气缸套上部变形均较大，下部变形均较小，各气缸套在变形总体上有Y轴拉长， X轴缩短的趋势，第2缸的变形相对较大，第1缸的变形相对较小；各缸套的顶端部分变形波动均较为剧烈，形变值较大；相对3缸非增压柴油机，采用增压技术对缸套各个截面的径向变形影响较小，3缸的缸套止口不平度均有明显降低，分别降低了约35.5%，23.2%和26.6%；利用深沉孔气缸盖螺栓结构，螺栓被进一步拉长，沉孔以上机体部分的压应力得到释放，相应的变形减小，可以有效抑制缸套止口形变发生。

In order to effectively suppress the seal failure caused by the deformation of cylinder liner after improving the explosion pressure of diesel engine cylinder, the variation laws of cylinder liner displacement, cylinder liner section deformation and cylinder liner stop flatness for a 3-cylinder turbocharged diesel engine with small displacement before and after the supercharging were compared and analyzed with the CAE analysis method based on the multi-body dynamics theory, and the feasible schemes and measures for controlling cylinder liner deformation were proposed. The results show that the deformation is large in the upper part and small in the lower part of cylinder liner before and after using the supercharging technology. The deformation of each cylinder liner lengthens along the Y axis and shortens along the X axis. The deformation of the second cylinder is relatively large and the deformation of the first cylinder is relatively small. The deformation fluctuation of the top part of each cylinder sleeve is more severe and the deformation value is larger. Compared with the 3-cylinder non-supercharged diesel engine, the supercharging technology has minor influence on the radial deformation of each section of cylinder liner. The unevenness of cylinder liner lip for the three cylinders reduces by about 35.5%, 23.2% and 26.6% respectively. After using the bolt structure of cylinder head with deep countersunk hole, the bolt is lengthened, the compressive stress of body part above the counterbore is released, the corresponding deformation is reduced, and the deformation of cylinder liner can be inhibited effectively.