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

Aiming at the large fluctuation for chains length of two eccentric sprockets transmission mechanism at work, an eccentric tensional sprocket was set. The chains were always in tension through the optimized revolving center, eccentricity and initiatory phasic angle of the eccentric tensional sprocket. By kinematics analysis with differential equation, the relation equation of angle displacement between the main sprockets wheel and subordinate sprockets was obtained. Then, the optimization calculation for the position of rotary center, initiatory phasic angle and eccentricity of the tensional sprocket was accomplished, with a view of the minimal degree of tightness fluctuate of chain. An optimizing example was present. Furthermore, the consideration for the non-continuity of chain length was taken into in optimization. 