液壓習(xí)題答案

1、1習(xí)題解答習(xí)題解答第三章第三章液壓泵液壓泵31已知已知泵轉(zhuǎn)速srrnp601750min1750??排量rmrmLV108.98.936????負(fù)載流量smLqL601025.13min25.1333????溢流閥調(diào)定壓力PakPap64103.101003.1????求：求損失功率。解：該題中只要是經(jīng)溢流閥溢流進(jìn)入油箱的流量損失，也就是流經(jīng)溢流閥的流量與溢流閥壓力的乘積。即kWpqnVPLpw67.0103.10)601025.136

2、01750108.9()(636?????????????34已知：齒輪泵的齒輪齒頂圓直徑，齒輪厚度mmmD048.0480??，齒輪齒數(shù)z=14，最高工作壓力p=10MPa=107Pa，轉(zhuǎn)速mmmB024.024??n=980rmin=98060[rs]，容積效率，總效率。求油泵輸入功90.0?pv?80.0?p?率Pi解：。由于是齒輪泵，對(duì)于標(biāo)準(zhǔn)BzmVnVqqpPppvppppi?????????22????齒輪有：—模數(shù)mmmz

3、DmDmmz3003.0214048.02200?????????kWpnzBmPppvi49.38.0109.060980024.014003.022722??????????????????補(bǔ)充題1：（1）D，A，C，B。（2）C，B，A。補(bǔ)充題2：已知：大泵流量q1=40Lmin，小泵流量q2=6Lmin，快進(jìn)時(shí)系統(tǒng)壓力p=1MPa=106Pa，工作進(jìn)給時(shí)大泵在p1=0.3MPa卸荷運(yùn)轉(zhuǎn)，小泵在p2=4.5MPa壓力給系統(tǒng)供油。解

4、：分兩種工況計(jì)算1）快進(jìn)時(shí)：kWqqpPpi96.08.06010)640(10)(36211?????????V=9.8mLrqL=13.25Lminnp=1750rmPw=p=10.3MPa3速度：速度：對(duì)于缸1：smmAqvp01.0min6.010501034311????????對(duì)于缸2：smmvAAvAvAv025.0min5.16.0205012122211????????A2A1p1p2W1W2qpv2v146已知：?jiǎn)螚U

5、液壓缸D=100mm，d=70mm，q=25Lmin，p1=2Mpa，p2=0.2MPa。求其牽引力F，速度v及運(yùn)動(dòng)方向。解：設(shè)無桿腔面積為A1，有桿腔面積為A2。則232222223221100.4)07.01.0(4)(41085.71.044mdDAmDA?????????????????a)kNApApF9.14100.4102.01085.710236362211?????????????leftwardsmmAqv053.0

6、min18.31085.71025331????????b)kNApApF43.61085.7102.0100.410236361221?????????????leftwardsmmAqv104.0min25.6100.41025332????????c)kNAApF7.710)0.485.7(102)(36211?????????rightwardsmmAAqv108.0min5.610)0.485.7(10253321??????