凸轮机构的特点

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1、TheTheoryofMachinesandMechanismsChapter4.CamsandItsDesignSunZhihongZhsun@dhu.edu.cn6237331762373319Room307,No.3TeachingBuildingToday’stopicsCharacteristicsofcammechanisms凸轮机构的特点Classificationandapplicationofcammechanisms凸轮机构的分类及应用Thefollower’smotiontype从动件的运动形式Characteristicsofcamme

2、chanisms凸轮机构的特点Whatisacammechanism?Asystem/mechanismthatusesacam(凸轮)andfollower(从动件)tocreateaspecificmotion.Inmostcases,thecamismerelyaflatpieceofmetalthathasanunusualshapeorprofile(轮廓)machinedontoit.Thiscamisattachedtoashaft(轴)whichenableittobeturnedbyapplyingaturningactiontothesha

3、ft.Asthecamrotates,itistheprofileorshapeofthecamthatcausesthefollowertomoveinaparticularway.Themovementofthefolloweristhentransmitted(传递)toanothermechanismoranotherpartofthemechanism.Characteristicsofcammechanisms凸轮机构的特点AdvantagesofcammechanismsSimpleandcompact(简单、紧凑)–thereonlythree

4、links,cam(凸轮),follower(从动件),frame(机架).Sometimes,thereisaroller(滚子).Thefollowercanpreciselyrealizeanytypemotion.ExampleDisadvantagesofcammechanismsHigherpair(高副),linecontactorpointcontact(线或点接触)Can’ttransfer(传递)largepower.FunctionContinuousturningmotion→translating(往复移动)oroscillating

5、(摆动)motion.ExampleApplication:internal-combustionengine(内燃机)Applicationofcammechanism凸轮机构的应用Camshaft（凸轮轴）ofanEngineincorporatingaRockerArm（摆臂）:Thediagramshownrightisanothertypicalcamandfollowersystemthatcouldbeusedinanengine. Thissystemincorporatesarockerarm(showninblueintheimage).I

6、nthiscasethemotionthatthecamimpartsonthefolloweristranslatedtothevalvethroughapushrodandtherockerarm.多臂提花机作者：潘存云教授绕线机构3作者：潘存云教授12Ayarn线Yarnwindingmachine(绕线机)作者：潘存云教授132送料机构ApplicationofcammechanismFeedingmechanism送料机构自动机床的进刀机构(FeederofAutomaticMachineTools)园柱凸轮回转→滚子带动推杆往复摆动→刀架的进刀和退

7、刀12刀架o机床进给机构13245放音键卷带轮皮带轮摩擦轮录音机卷带机构作者：潘存云教授3皮带轮5卷带轮录音机卷带机构1放音键2摩擦轮4Classificationofcammechanism凸轮机构的分类Bythecamshape(按凸轮形状分)Bythefollowershape(按从动件类型分)Bythefollower’smotiontype(按从动件运动形式分)Bythemannerofkeepingthecamandthefollowerincontact(按从动件与凸轮的锁合方式分)BythecamshapeEdge,plateorfacecam

8、s盘状凸轮BythecamshapeT