【正文】 .................... II 1 緒論 ................................................................................................................ 1 課題來源 ..............................................................1 液壓舉升系統(tǒng)的使用要求 ..............................................1 國內(nèi)外發(fā)展?fàn)顩r .......................................................2 國內(nèi)發(fā)展概況 .......................................................2 國外發(fā)展概況 ........................................................2 改進(jìn)的實際意義 ........................................................2 2 液壓系統(tǒng)方案確定 ............................................................................................ 3 舉升機構(gòu)液壓系統(tǒng)改進(jìn)方案及特性分析 ....................................3 整車性能參數(shù)的選擇 ....................................................4 參數(shù)的確定 ..........................................................4 質(zhì)量參數(shù)的確定 .....................................................5 最大舉升角的確定 ...................................................5 舉升時間的確定 ......................................................5 3 舉升機構(gòu)的設(shè)計 ................................................................................................ 6 舉升機構(gòu)的類型及選擇 ..................................................6 直推式 ..............................................................6 油缸與桿系組合式 ....................................................6 T 式舉升機構(gòu)的運動與受力分析及參數(shù)選擇 [5] ..............................6 作圖法 ..............................................................6 計算舉升最大阻力矩 ..................................................8 舉升合力 ............................................................8 油缸最大舉升推力 ....................................................8 拉桿最大拉力 ........................................................9 液壓缸的設(shè)計計算 ......................................................9 缸筒材料選擇 ........................................................9 油缸的內(nèi)徑計算 ......................................................9 活塞桿直徑的計算 ...................................................9 油缸外徑的確定 .....................................................9 缸筒壁厚 ............................................................9 活塞桿強度的校核 ...................................................10 剛度校核 ..........................................................10 缸筒壁厚的校核 .....................................................10 液壓缸缸底厚度計算 .................................................11 大學(xué)本科畢業(yè)設(shè)計（論文） IV 密封件的選用 ......................................................11 缸筒的長度 ........................................................12 鋼蓋厚度計算 ......................................................12 連接計算 ..........................................................13 油泵的選型計算 ......................................................15 計算壓力損失 .......................................................15 油泵的工作壓力： ...................................................17 油泵的理論流量 .....................................................17 由選定的油泵計算油泵的工作功率 .....................................18 輔助件的計算 .........................................................19 油箱的容積與油管的內(nèi)徑計算 .........................................19 油 液溫升驗算 .......................................................20 單向閥的選用 .......................................................21 換向閥的選用 ......................................................21 4 液壓系統(tǒng)總體布置方案 .................................................................................... 22 液壓系統(tǒng)結(jié)構(gòu)布置 .....................................................22 結(jié)論 ................................................................................................................. 23 參考文獻(xiàn) .......................................................................................................... 24 致謝 ................................................................................................................. 25 目錄 1 1 緒論 課題來源 選擇二類底盤，舉升力 F=15t； 貨廂的傾斜角為 500 — 550 ，在其基礎(chǔ)上確定結(jié)構(gòu)類型及總體構(gòu)造。 關(guān)鍵詞 自卸車 液壓系統(tǒng) 油缸 油泵 大學(xué)本科畢業(yè)設(shè)計（論文） II Abstract With the quick development of our country traffic transportion, hydraulic pressure system application already has got broader and broader in each fields. In order to make the mechanization discharging cargo e true, thereby hydraulic pressure system can reduce labour intensity, inprove the speed, easy to discharge pressure selfdischarging system was set up in lots of agriculture transportation automobile. But there are still a few defects and deficiency exist in the traditional hydraulic pressure litre system. Frist: it adopts multilevel telescopic cylinders, which only is applied in the partment angle less than 45 degrees occasions。 本文主要對自卸汽車液壓舉升機構(gòu)進(jìn)一步改進(jìn)與完善，自卸車采用的油泵、油缸、液壓閥等液壓系統(tǒng)元件均為高度標(biāo)準(zhǔn)化、系統(tǒng)化與通用化，是由專業(yè)化液壓 件廠集中生產(chǎn)供應(yīng)，因此自卸車優(yōu)化設(shè)計只需進(jìn)行液壓元件選