为适应日趋严格的排放法规，内燃机制造商们采用的技术措施之一是缩小活塞项环到缸盖的距离，而减小这个距离最有效的方法是降低活塞顶岸的高度，即将活塞第一环槽上移，进入活塞的强受热部分，从而受到更高的热负荷和机械负荷，为保证第一环槽的耐热强度和耐磨性，Mahle公司研 To meet the increasingly stringent emission regulations, one of the technical measures adopted by internal combustion engine manufacturers is to reduce the distance between the piston collar and the cylinder head. The most effective way to reduce this distance is to reduce the height of the top of the piston, The ring groove moves upwards and enters the strong heated part of the piston to be subjected to higher heat load and mechanical load. In order to ensure the heat resistance and wear resistance of the first ring groove, Mahle Company