【正文】 ..................................................................................................................１９ 主要回路 .......................................................................................................................２０ 功能實(shí)現(xiàn)和工作原理 ...................................................................................................２０ 變幅回路 ..............................................................................................................................２１ 性能要求 .......................................................................................................................２１ 主要元件 .......................................................................................................................２１ 主要回路 .......................................................................................................................２２ 功能實(shí)現(xiàn)和工作原理 ...................................................................................................２２ 支腿回路 ..............................................................................................................................２３ 性能要求 .......................................................................................................................２３ 主要元件 .......................................................................................................................２３ 主要回路 .......................................................................................................................２３ 功能實(shí)現(xiàn)和工作原理 ...................................................................................................２４第 4 章 液壓系統(tǒng)設(shè)計(jì)計(jì)算 ......................................................................................２５ 液壓系統(tǒng)工作參數(shù)和各機(jī)構(gòu)主要參數(shù) ..............................................................................２５ 工作機(jī)構(gòu)主要參數(shù) ......................................................................................................２５ 液壓系統(tǒng)參數(shù) ..............................................................................................................２６ 液壓元件選擇計(jì)算 ..............................................................................................................２７ 液壓馬達(dá)和液壓泵的選擇計(jì)算 ..................................................................................２７ 液壓閥的選擇 ..............................................................................................................３７ 液壓輔助元件選擇 ......................................................................................................４０第 5 章 系統(tǒng)各回路性能計(jì)算 ..................................................................................４４ 系統(tǒng)各回路功率計(jì)算 ..........................................................................................................４４ 各回路功率選取 ..........................................................................................................４４ 管路系統(tǒng)容積效率及壓力效率計(jì)算 ..........................................................................４４ 系統(tǒng)各回路性能的驗(yàn)算 ......................................................................................................４５ 起升回路 ......................................................................................................................４５ 回轉(zhuǎn)回路 ......................................................................................................................５０ 伸縮回路 ......................................................................................................................５１ 變幅回路 ......................................................................................................................５３ 支腿回路 ......................................................................................................................５４ 液壓系統(tǒng)的發(fā)熱驗(yàn)算 ..........................................................................................................５５ 工作循環(huán)周期 T...........................................................................................................５５ 油泵損失所產(chǎn)生的熱能 H ..........................................................................................５６ 馬達(dá)產(chǎn)生的熱量 ..........................................................................................................５７ 油箱散熱量 ..................................................................................................................５８第 6 章 起重機(jī)液壓系統(tǒng)電液比例控制專(zhuān)題研究 ..................................................５９ 電液比例控制原理和特點(diǎn) ..................................................................................................５９ 起重機(jī)部件電液比例控制 ..................................................................................................６０ 電液比例對(duì)各回路的控制 ..................................................................................................６３ 電液比例對(duì)起重機(jī)液壓系統(tǒng)的影響及發(fā)展趨勢(shì) ..............................................................６６第 7 章 總結(jié) ..............................................................................................................６８ 設(shè)計(jì)總結(jié) ..............................................................................................................................６８ 工作展望 ..............................................................................................................................６８致謝 ............................................................................................................................６９參考文獻(xiàn) ....................................................................................................................７０附錄 1 QY40 液壓汽車(chē)起重機(jī)液壓系統(tǒng)原理圖 ..................................................７１附錄 2 QY40 液壓汽車(chē)起重機(jī)液壓系統(tǒng)電磁鐵動(dòng)作順序表 ..............................７２附 錄 3 QY40 液壓汽車(chē)起重機(jī)液壓系統(tǒng)元件明細(xì)表 ..........................................７３任務(wù)書(shū) ........................................................................................................................７４文獻(xiàn)綜述 ....................................................................................................................７６開(kāi)題報(bào)告 ................................