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

A 4 axle driven hill terrain vehicle was made in China. To improve the vehicle fatigue strength and reliability, the dynamics models of 4 axle-load were founded when it crossing obstacle. According to the dynamics models, the axleload distributions of the vehicle crossing obstacle were calculated when offroad adhesion coefficient φ is 0.1~1.0. The results showed its axleload distributions had more different among 4-axle when the vehicle crossing obstacle, the distribution law was analyzed. The design of 4-axle different strength and improving the 4-axle strength was put forward. The paper provided a mathematic model for reliability design and optimizing distribution of torque when the hill-ground crossing obstacle.