久久hd-xxxx日本少妇-中国91视频-欧美狠狠插-久久视精品-天天天天天天天天操-日韩xxxxxxxx-中国黄色录像一级片-亚洲最大的黄色网址-顶臀精品视频www-午夜成年-日韩av偷拍-jjzz在线-午夜伦伦-国产成人精品在线播放-人民的名义第二部

Development of metallurgical machinery gear theory and manufacturing processes will be further study the mechanism of tooth damage, which is to establish a reliable method of strength calculation basis is to improve the carrying capacity of gears, gear extended theoretical basis of life; the development of a circular arc tooth profile the new tooth representatives; study new materials and manufacturing gear gear new technology; the elastic deformation of gear research, manufacture and installation errors, and the distribution of temperature field, performed tooth modification to improve the smoothness of running gear and at full load increases the contact area between the teeth, thereby enhancing the carrying capacity of gears.

Friction, lubrication technology lubrication theory and metallurgical machinery gears basic research work on the elastic hydrodynamic lubrication theory, promote the use of synthetic lubricants and extreme pressure additives added as appropriate in oil, not only can increase the carrying capacity of the tooth surface but also can improve the transmission efficiency.