前言: 无級变速是現代机床等拖动的发展方向。采用无級变速拖动后,能使机床发揮最大的生产率,使用最合理的切削用量,并能使传动平稳,从而提高了机床的加工精度。其中机械式的虽因效率、摩損等情况不够理想,但因制造使用上具有現实意义,所以各国对这方面都进行了一些研究,如苏联1620車床就是采用了反球面式无級变速器传动的,其精度极 Foreword: CVT is the development direction of modern machine tools such as dragging. With variable speed drag, the machine can maximize productivity, use the most reasonable amount of cutting, and make the transmission stable, thus improving the machining accuracy. The mechanical type is not ideal due to the efficiency, wear and other conditions, but because of the practical significance of the manufacture and use, all countries conducted some research in this respect. For example, the Soviet Union 1620 lathe is the use of anti-spherical CVT transmission , Its accuracy is extremely