为确保柴油机在全负荷工况下可靠工作,必须使活塞环能够很好地密封住燃烧室,即活塞环的整个工作表面必须紧靠在缸套上。如果活塞环和缸套之间有空隙,则难免出现漏气;漏气会吹掉润滑油膜、使摩擦表面过热,从而造成擦伤(即拉缸)。实际上不可能使事先制造的气缸活塞组各零件彼此之间准确地配合。因为很难考虑到气缸活塞组由动力、热力和装配 To ensure reliable operation of the diesel engine at full load, the piston ring must be well sealed to the combustion chamber so that the entire working surface of the piston ring must abut against the cylinder liner. If there is a gap between the piston ring and the cylinder liner, it is inevitable that air leakage will occur; the air leak blows off the lubricating film, causing the friction surface to overheat, causing galling (ie, pulling the cylinder). In practice, it is virtually impossible to precisely match the parts of the cylinder piston assembly manufactured in advance with each other. Because it is hard to consider the cylinder piston set by power, heat and assembly