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时间:2018-09-21
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1、Lesson4ShaftsandCouplingsTerminologyTexttour8/10/20211《机械工程专业英语教程》Terminology8/10/20212《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》8/10/2021SocketwrenchAwrenchwithausuallyinterchangeable
2、sockettofitoveranutorbolt3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》8/10/2021KeywayAslotforakeyinthehuborshaftofawheel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》8/10/2021screw: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》8/10/2021stem:杆,棒,柄,柱,轴clutc
3、h:抓住,捏紧,离合器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》8/10/2021propeller: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)canbe
4、eithersolidorhollow(hollowshaftscanresultinweightsavings减轻重量).《机械工程专业英语教程》8/10/2021Texttour8Rectangularshaftsaresometimesused,asinscrewdriverblades,socketwrenchesandcontrolknobstems(螺丝刀的头、套筒扳手和控制旋扭的杆).Ashaftmusthaveadequatetorsionalstrength(抗扭强度)totransmit
5、torqueandnotbeoverstressed.《机械工程专业英语教程》8/10/20219Generallyspeaking,theangleoftwist(扭转角)shouldnotexceedonedegreeinashaftlengthequalto20diameters.Itmustalsobetorsionallystiff(刚度)enoughsothatonemountedcomponentdoesnotdeviateexcessivelyfromitsoriginalangularpo
6、sitionrelativetoasecondcomponentmountedonthesameshaft.Shaftsaremountedinbearingsandtransmitpowerthroughsuchdevicesasgears,pulleys,camsandclutches(齿轮、皮带轮、凸轮和离合器).《机械工程专业英语教程》8/10/202110Thesedevicesintroduceforceswhichattempttobendtheshaft;hence,theshaftmust
7、berigidenoughtopreventoverloadingofthesupportingbearings.Ingeneral,thebendingdeflectionofashaftshouldnotexceed0.01in.perftoflengthbetweenbearingssupports.Inaddition,theshaftmustbeabletosustainacombinationofbendingandtorsionalloads(弯矩和扭矩).Thusanequivalent(等
8、效的,当量的)loadmustbeconsideredwhichtakesintoaccountbothtorsionandbending.《机械工程专业英语教程》8/10/202111Also,theallowablestressmustcontainafactorofsafetywhichincludesfatigue,sincetorsionalandbendingstressreversals(交变)oc
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