ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

The structure and drive principle of the cycloid ball planetary transmission was introduced. The mathematic models for the tooth surfaces of epitrochoid and hypotrochoid enclosed grooves generated by cone milling cutter were proposed. According to space meshing theory, the meshing equations and the undercut limit functions were deduced. The variational regularity of undercut limit functions with the fundamental design parameters were analyzed through the numerical method. The analytical results showed that the undercutting phenomenon of the tooth surfaces of hypotrochoid and epitrochoid enclosed grooves occurred orderly corresponding to the variation of fundamental design parameters, and the first undercut point always occurred on inside tooth surface of hypotrochoid groove. Consequently, a simpler dimensionless inequality which can avoid the undercut was derived from the proposed analysis. Then, the conclusion was verified by the design examples and the computer simulations. The research results offer a theoretical basis for designing and manufacturing of the cycloid ball planetary transmission. 