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1、TheTheoryofMachinesandMechanismsChapter4.CamsandItsDesignSunZhihongZhsun@dhu.edu.cn6237331762373319Room307,No.3TeachingBuildingToday’stopicsCharacteristicsofcammechanisms凸輪機構(gòu)的特點Classificationandapplicationofcammechanisms凸輪機構(gòu)的分類及應(yīng)用Thefollower’smotiontype從動件的運動形式Characteristicsofcamme
2、chanisms凸輪機構(gòu)的特點Whatisacammechanism?Asystem/mechanismthatusesacam(凸輪)andfollower(從動件)tocreateaspecificmotion.Inmostcases,thecamismerelyaflatpieceofmetalthathasanunusualshapeorprofile(輪廓)machinedontoit.Thiscamisattachedtoashaft(軸)whichenableittobeturnedbyapplyingaturningactiontothesha
3、ft.Asthecamrotates,itistheprofileorshapeofthecamthatcausesthefollowertomoveinaparticularway.Themovementofthefolloweristhentransmitted(傳遞)toanothermechanismoranotherpartofthemechanism.Characteristicsofcammechanisms凸輪機構(gòu)的特點AdvantagesofcammechanismsSimpleandcompact(簡單、緊湊)–thereonlythree
4、links,cam(凸輪),follower(從動件),frame(機架).Sometimes,thereisaroller(滾子).Thefollowercanpreciselyrealizeanytypemotion.ExampleDisadvantagesofcammechanismsHigherpair(高副),linecontactorpointcontact(線或點接觸)Can’ttransfer(傳遞)largepower.FunctionContinuousturningmotion→translating(往復(fù)移動)oroscillating
5、(擺動)motion.ExampleApplication:internal-combustionengine(內(nèi)燃機)Applicationofcammechanism凸輪機構(gòu)的應(yīng)用Camshaft（凸輪軸）ofanEngineincorporatingaRockerArm（擺臂）:Thediagramshownrightisanothertypicalcamandfollowersystemthatcouldbeusedinanengine.?Thissystemincorporatesarockerarm(showninblueintheimage).I
6、nthiscasethemotionthatthecamimpartsonthefolloweristranslatedtothevalvethroughapushrodandtherockerarm.多臂提花機作者：潘存云教授繞線機構(gòu)3作者：潘存云教授12Ayarn線Yarnwindingmachine(繞線機)作者：潘存云教授132送料機構(gòu)ApplicationofcammechanismFeedingmechanism送料機構(gòu)自動機床的進刀機構(gòu)(FeederofAutomaticMachineTools)園柱凸輪回轉(zhuǎn)→滾子帶動推桿往復(fù)擺動→刀架的進刀和退
7、刀12刀架o機床進給機構(gòu)13245放音鍵卷帶輪皮帶輪摩擦輪錄音機卷帶機構(gòu)作者：潘存云教授3皮帶輪5卷帶輪錄音機卷帶機構(gòu)1放音鍵2摩擦輪4Classificationofcammechanism凸輪機構(gòu)的分類Bythecamshape(按凸輪形狀分)Bythefollowershape(按從動件類型分)Bythefollower’smotiontype(按從動件運動形式分)Bythemannerofkeepingthecamandthefollowerincontact(按從動件與凸輪的鎖合方式分)BythecamshapeEdge,plateorfacecam
8、s盤狀凸輪BythecamshapeT
