汽车专业英语(幻灯片)chapter 5 drive axle(3.4-3.8)

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1、Review1:What’sthefunctionofdriveshaftandUJ?Totransmitthedrivefromthetransmissionmainshafttothefinaldrivepinion;Tohavesomeallowanceformotionbetweenthefinaldriveandtransmission.1)Thesuspensionconnectsthefinaldriveassemblytothecarbody.Thefinaldrivemovesupanddowninrelationtotheengin

2、eandtransmission.Acouplingisneededthatpermitsmovementbetweenthefinaldriveandtransmission.Theuniversaljoints(U-joints)andslidingjointsprovidethiscoupling.悬架连接着主减速器总成和车身。主减速器相对于发动机和变速器上下运动，这样就需要一个连接器来允许主减速器和变速器之间相对运动。万向节和滑动联轴节提供了这种连接作用．Review2:ListthetypesofUJ(Universaljoints).Non

3、-constantVelocityUniversalJointConstantVelocityUniversalJointNear-constantVelocityUniversalJointCardan(Hooke’s)UniversalJoint（十字轴式万向节）DoubleCardanUniversalJoint（双联式万向节）RzeppaUniversalJoint（球笼式万向节）TripodUniversalJoint（三销轴式万向节）WeissUniversalJoint（球叉式万向节）FlexibleUniversalJoint（挠性万向

4、节）2)HeretwoU-shapedpiecesareplacedperpendiculartooneanotherandjoinedwithasimplecross[Fig.3-16].TheU-shapedpiecesarecalledyokes.Thecrossthatconnectsthemiscalledaspider.Thearmsthatextendfromthespiderarecalledtrunnions.Thetwoyokesareata90ºangletooneanother.Mostcarshavetwouniversalj

5、oints,oneateachendofthepropellershaft.两个U形片垂直布置，通过十字叉连接在一起。U形片称为万向节叉，连接万向节叉的十字叉叫作十字轴，从十字轴延伸出的臂叫作耳轴，两个万向节叉成90º布置。多数汽车采用两个万向节，在传动轴的每一端各有一个万向节。3)Ashaftwhichreceivesthedrivefromacrosstypejointvariesitsspeedduringrotation;thegreaterthedriveanglethegreaterthespeedvariation.Aconstantro

6、tationalspeedcanberestoredbyfittingasecondjointinawaysuchthatwhenthefirstjointincreasesitsspeedthesecondjointdecreasesitsspeed.传动轴接收十字轴式万向节传来的动力，转动时其速度发生变化。传动角越大，速度变化越大。要实现等速，必须以某种方式安装第二个万向节，这样第一个万向节使转速增大，第二个万向节就使转速减少。Review3:Listthemainpartsofdrivingaxle.Review3:What’sthefuncti

7、onofFinalDrive?ToreducethespeedofrotationToredirectthelineofdriveSingle(reduction)finaldrive(单级主减速器)DrivepinionCrowngear(ringgear)主动轮从动轮Thefinaldriveconsistsofahypoidbevelgeardrive.Thegeometryofthebeveldrivepinionandofthecrownwheeldeterminesthefinaldriveratio.Review4:ListtheGear

8、Typesoffinaldrive.SpurGear（直齿圆柱齿轮）HelicalGear（斜