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编号为DIN70907,DIN70908,DIN70909的西德活塞环标准,分别颁布于 1980、1983、1987年。其中DIN70907作为德国建议标准被国际标准化组织的ISO/TC22和ISO/TC70两个技术委员会采纳,在此基础上创订了活塞环国际标准ISO6621。这个国际标准与原西德标准DIN70907比较,在内容上作了充实,在制造上则更符合国际上的技术现状,并纳入了弹簧拉紧挡油环的有关数据。 为了便于使用活塞环国际标准ISO6621,《西德标准通报》刊登分析文章,剖析DIN70907与ISO6621的异同。现把主要部分摘择如下:
West Germany Piston Ring No. DIN70907, DIN70908, DIN70909 standards were promulgated in 1980, 1983, 1987. Which DIN70907 as German recommended standards by the International Organization for Standardization ISO / TC22 and ISO / TC70 two technical committees to adopt, on the basis of which set the piston ring international standard ISO6621. Compared with the former West German standard DIN70907, this international standard has been enriched in content and more in line with the international technological status in manufacturing. The data relating to the spring tightening of the oil deflector is also included. In order to facilitate the use of piston ring international standard ISO6621, “West Germany Standard” published analysis of articles, analysis of similarities and differences between DIN70907 and ISO6621. The main part is as follows: