活塞环１前言活塞环是左右内燃机等往复式机械性能的最重要零件之一。经多次努力、反复研究和改进，才生产出现用的活塞环。特别是最近，为了适应车用发动机急剧的高性能化和排放等法规，活塞环的使用条件进一步严酷化。因此，活塞环的功能日益受人重视。２活塞环的功能（... Piston ring 1 Foreword Piston ring is one of the most important parts of reciprocating mechanical performance such as internal combustion engine. After many efforts, repeated research and improvement, the emergence of the emergence of the use of piston rings. In recent years, the use conditions of piston rings have been further harsh, in order to meet the drastic high-performance and emission regulations of vehicle engines. Therefore, the function of the piston ring is paid more and more attention. 2 piston ring function (...