去年在美国出现了对具有某些设计特点以改进密封性能的唇型油封的强烈兴趣的热潮。对这些油封的称呼纷纭不一,在本文中,将用“正作用油封”这个名称。在欧洲,油封制造商对正作用油封发生兴趣已有很长的时间了,本文将介绍目前欧洲在这方面的一些情况。为了理解现状,必须对正作用油封的发展历史作一简单的回顾。 Last year there was a strong interest in the United States of lip seals with some design features to improve the sealing performance. The names of these oil seals vary in this article, will use the name “positive role in oil seal.” In Europe, it has been a long time since oil seal manufacturers have become interested in operating oil seals. This article will present some of the current developments in Europe in this area. In order to understand the status quo, we must make a brief review of the history of the development of the oil seal being used.