文档介绍：0 目录内容提要··············································································· 2 绪论................................................................................................................... 3 前言............................................................................................................. 3 课题设计要求............................................................................................. 4 2 国内外研究现状及发展动态....................................................................... 5 国外研究状况及发展动态........................................................................ 5 国内研究情况及发展动态........................................................................ 7 3 液压系统的设计........................................................................................... 7 液压挖掘机的工况分析............................................................................ 8 液压系统的主要参数确定...................................................................... 12 负载分析.................................................................................................. 13 液压缸主要几何尺寸的计算.................................................................. 15 液压缸结构参数的计算.......................................................................... 17 4 液压系统原理图的制定............................................................................. 22 制定基本方案.......................................................................................... 22 确定回路方式........................................................................................... 24 选用液压油液.......................................................................................... 25 绘制液压系统原理图.............................................................................. 28 5 选择各液压元件.......................................................................................... 29 液压泵的选择.......................................................................................... 29 柴油发动机的选择.....