操一操91视频_欧美区自拍偷拍_日韩性xx在线视频_日韩欧美抽查使劲插_中国大陆无码_免费性爱视频网_天堂久久国产一区二区_天天摸夜夜添_北条麻妃一区二区韩晓雅_国产艹艹艹艹_无码精品国产AV在_chinaav免费视频_久久午夜无码鲁丝片午夜精片_老熟女黄片_777久久久久久久久久久

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.