轮机英语（二三管轮）Lesson 4 Diesel Engine Construction (Moving Parts).ppt

Unit1MainPropulsionPlantLesson4DieselEngineConstruction(MovingParts)4.1TheCrankshaft4.2TheConnectingRodandCrosshead4.3ThePistonNewWordsandExpressionsintermediate[??nt??mi:di?t]a.中间的generator[?d?en?re?t?(r)]n.发电（原动）机shrink[?r??k]v.红套，收缩，冷缩crankpin[kr??kp?n]n.曲柄销layout[?le?a?t]n.布局，布置，设计predetermined[?pri:d??t?:m?nd]a.预先确定的displacement[d?s?ple?sm?nt]n.移位counterweight[?ka?nt?we?t]n.平衡重NewWordsandExpressionschromium[?kr??mi?m]n.铬nickel[?n?kl]n.镍molybdenum[m??l?bd?n?m]n.钼compromise[?k?mpr?ma?z]v.妥协，折中thermal[?θ?:ml]a.热（力）的taper[?te?p?(r)]a.锥形的，逐渐变窄的clearance[?kl??r?ns]n.间隙stabilize[?ste?b?la?z]v.稳定，使稳固NewWordsandExpressionsbronze[br?nz]n.青铜abrasive[??bre?s?v]a.磨料的，磨损的cermet[s?:met]n.金属陶瓷hollow[?h?l??]a.中空的annular[??nj?l?(r)]a.环形的scraper[skre?p?(r)]n．刮sludge[sl?d?]n.渣，沉积物crankthrow曲柄臂NewWordsandExpressionsguideshoe导板滑块running-in磨合cocktailshaker鸡尾振荡4.1TheCrankshaftCrankshaft(seeFig.4-1)istheintermediatepartofamarineengine,whichtransfersthepowerofafiringcylinderfromthereciprocatingpistontotherotatingpropeller(oralternatorincaseofagenerator).4.1TheCrankshaftTheworkingofothercomponentsoftheenginedependsuponthecorrectrotationofthecrankshaftsuchascamshaftforfueltiming,firingorderofunitsetc.Failureofasinglepartofthecrankshaftcandamagetheengineaswellastheship.Thecrankshaftsarebuiltuptypes.Forthesemi-builttype,theforgedmainbearingjournalsareshrunkintocaststeelcrankthrowswithacrankpinandtwothrowsasoneunit.Inthefullybuilttype,thecrankthrowsareshrunkintomainjournalsandcrankpins(对于半组合式（曲轴），锻造主轴颈冷缩入铸钢曲柄臂中，此时两个曲柄臂和一个曲柄销形成一个单元。在全组合式（曲轴）中，曲柄臂冷缩入主轴颈和曲柄销中).Thecrankthrowsaredisplacedfromeachothertoobtainthesamenumberofdegreesbetweenthedifferentcrankthrows.Thecrankpinsareprovided