武科大机械专业英语lesson4

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1、Lesson4ShaftsandCouplingsTerminologyTexttour7/4/20211《机械工程专业英语教程》Terminology7/4/20212《机械工程专业英语教程》CouplingAcouplingisadeviceforconnectingtheendsofadjacentshafts.联轴器：联轴器是用来把相邻的两个轴的轴端联接起来的装置《机械工程专业英语教程》7/4/2021SocketwrenchAwrenchwithausuallyinterchangeablesocke

2、ttofitoveranutorbolt3套筒扳手：通常带有可替换套筒以适于螺帽或螺栓的扳手《机械工程专业英语教程》7/4/2021KeywayAslotforakeyinthehuborshaftofawheel键槽：轮毂里或轴上装键的沟槽Bolt螺栓,螺杆4《机械工程专业英语教程》7/4/2021screw:螺钉Screwdriver:螺丝刀socket:插座，插口，套筒扳手wrench:扳手，拧，扳紧，扭转5《机械工程专业英语教程》7/4/2021stem:杆，棒，柄，柱，轴clutch:抓住，捏紧，离合

3、器Cold-roll:冷轧，冷轧机forge:锻造，打制，锻工车间key:键Keyway:键槽，销座6《机械工程专业英语教程》7/4/2021propeller:螺旋桨，推进器flange:凸缘，法兰盘hub:衬套，轮毂Flexiblecoupling:弹性联轴器，挠性联轴器7Virtually（infact）allmachinescontainshafts．Themostcommonshapeforshaftsiscircularandthecrosssection(截面)canbeeithersolidor

4、hollow(hollowshaftscanresultinweightsavings减轻重量)．《机械工程专业英语教程》7/4/2021Texttour8Rectangularshaftsaresometimesused，asinscrewdriverblades，socketwrenchesandcontrolknobstems（螺丝刀的头、套筒扳手和控制旋扭的杆）．Ashaftmusthaveadequatetorsionalstrength（抗扭强度）totransmittorqueandnotbeov

5、erstressed．《机械工程专业英语教程》7/4/20219Generallyspeaking，theangleoftwist（扭转角）shouldnotexceedonedegreeinashaftlengthequalto20diameters．Itmustalsobetorsionallystiff（刚度）enoughsothatonemountedcomponentdoesnotdeviateexcessivelyfromitsoriginalangularpositionrelativetoase

6、condcomponentmountedonthesameshaft．Shaftsaremountedinbearingsandtransmitpowerthroughsuchdevicesasgears，pulleys，camsandclutches（齿轮、皮带轮、凸轮和离合器）．《机械工程专业英语教程》7/4/202110Thesedevicesintroduceforceswhichattempttobendtheshaft；hence，theshaftmustberigidenoughtoprevent

7、overloadingofthesupportingbearings．Ingeneral，thebendingdeflectionofashaftshouldnotexceed0.01in．perftoflengthbetweenbearingssupports．Inaddition，theshaftmustbeabletosustainacombinationofbendingandtorsionalloads（弯矩和扭矩）．Thusanequivalent（等效的，当量的）loadmustbeconside

8、redwhichtakesintoaccountbothtorsionandbending．《机械工程专业英语教程》7/4/202111Also，theallowablestressmustcontainafactorofsafetywhichincludesfatigue，sincetorsionalandbendingstressreversals（交变）occur．Fordiam