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1、Review1:What’sthefunctionofSteeringsystem?Toconvertthesteering-wheelrotarymotionintoaturnmotionofthesteeredwheelsofthevehicle.Toguidethecarwherethedriverwantsittogo.转向器Steeringbox/gear转向摇臂Pitman/Droparm转向直拉杆Draglink转向节臂Steeringarm转向节Steeringknuckle梯形臂Trackarm横拉杆TrackrodR
2、eview2:Basicpartsofsteeringsystem转向轴Steeringaxle方向盘Steeringwheel转向万向节steeringshaftuniversaljointsteeringcontrolmechanism转向操纵机构Steeringgear转向器Steeringlinkage转向传动机构梯形臂TrackarmThebasicsteeringsysteminmostcarsisthesame.Thesteeringgearofsteeringboxistheheartofthesteeringsyste
3、m.Thisusuallyisnexttotheengine.Ashaftextendsfromthebackofthesteeringgear.Thisshaftisconnectedtothesteeringcolumnorsteeringshaft.Thesteeringwheelisatthetopofthesteeringcolumn.Anothershaftcomesfromthebottomofthesteeringgear.Thisshaftconnectstothearms,rods,andlinks.Thispart
4、sassembly,calledthesteeringlinkage,connectsthesteeringgeartothepartsatthewheels.Thewheelsandtiresmounttothesteeringknuckles.AsshowninFig.5-1,theknucklesarepivotedatthetopandbottom.Thus,thewheelsandtirescanturnfromsidetoside.多数汽车的转向系基本上是一样的。转向系的核心是转向器，一般位于发动机附近。一根轴从转向器后部伸
5、出，连接着转向柱。方向盘在转向柱的顶端。另一根轴从转向器低端伸出，连接着转向臂、转向拉杆和转向杆系，这些部件总称为转向传动机构，连接转向器和车轮上的部件。车轮和轮胎安装在转向节上。如图5-1所示，转向节的上下端可自由转动，这样车轮可从一侧转到另一侧。Whilethesteeringsystemmaylookcomplicated,itworksquitesimply.Whenadriverdrivesacarstraightdowntheroad,thesteeringgeariscentered.Thegearholdsthelink
6、agecenteredsothatthewheelsandtirespointstraightahead.Whenthedriverturnsthesteeringwheel,thesteeringshaftrotatesandthesteeringgearmovestowardthatside.Theshaftcomingoutthebottomofthesteeringgearturns,aswell.Whentheshaftturns,itpullsthelinkagetoonesideandmakesthesteeringknu
7、cklesturnslightlyabouttheirpivotpoints.Thus,thesteeringknuckle,spindle,wheels,andtiresturntooneside,causingthecartoturn.转向系看起来复杂，工作原理却很简单。汽车直行时，转向器处于中间位置，转向传动机构也处于中间位置，车轮直行。驾驶员转动方向盘，转向轴旋转，转向器向同侧转动，同时转向器底部的输出轴也会旋转。输出轴转动时，会向一侧拉动拉杆，使得转向节绕其支点旋转。这样，转向节、转向节轴端、车轮和轮胎都会向一侧旋转，汽车实现
8、转向。Review2:HowtheofSteeringSystemworks?Review3:HowdoestheSteeringSystemwork?Review3:HowdoestheSteeringS
