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1、Chapter4.CamsandItsDesignSunZhihongZhsun@dhu.edu.cn67792564-108Today’stopicsCharacteristicsofcammechanisms凸輪機構的特點Classificationandapplicationofcammechanisms凸輪機構的分類及應用Thefollower’smotiontype從動件的運動形式Whatisacammechanism?Asystem/mechanismthatusesacam(凸輪)andafollower(從
2、動件)tocreateaspecificmotion.Inmostcases,thecamismerelyaflatpieceofmetalthathasanunusualshapeorprofile(輪廓).Thecamisattachedtoashaft(軸)whichenableittobeturnedbyapplyingaturningactiontotheshaft.Asthecamrotates,itistheprofileorshapeofthecamthatcausesthefollowertomovein
3、aparticularway.Themovementofthefolloweristhentransmitted(傳遞)toanothermechanismoranotherpartofthemechanism.AdvantagesofcammechanismsSimpleandcompact(簡單、緊湊)–thereonlythreelinks,cam(凸輪),follower(從動件),frame(機架).Sometimes,thereisaroller(滾子).Thefollowercanpreciselyreali
4、zeanytypemotion.ExampleDisadvantagesofcammechanismsHigherpair(高副),linecontactorpointcontact(線或點接觸)Can’ttransfer(傳遞)largepower.FunctionContinuousturningmotion→translating(往復移動)oroscillating(擺動)motion.ExampleApplicationofcammechanismCamshaft（凸輪軸）ofanEngineincorporat
5、ingaRockerArm（擺臂）:Thediagramshownrightisatypicalcamandfollowersystemthatcouldbeusedinanengine.?Thissystemincorporatesarockerarm(showninblueintheimage).Inthiscasethemotionthatthecamimpartsonthefolloweristranslatedtothevalvethroughapushrodandtherockerarm.Dobby多臂提花機作
6、者：潘存云教授繞線機構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Feedingmechanism送料機構FeederofAutomaticMachineTools自動機床的進刀機構園柱凸輪回轉→滾子帶動推桿往復擺動→刀架的進刀和退刀12刀架o機床進給機構13245放音鍵卷帶輪皮帶輪摩擦輪錄音機卷帶機構3皮帶輪5卷帶輪錄音機卷帶機構1放音鍵2摩擦輪4錄音機卷帶機構Classificationofcammechanism凸輪機構的分類Bythecamshape
7、(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)Edge,plateorfacecams盤狀凸輪Translatingcams移動凸輪Cylindricalordrumcams圓柱凸輪Bythefollowerend’sshape Knife-edgefollower尖頂從動件Theendofthefol
8、lowerisverysharp(nearlyapoint)ThecontactbetweenthecamandthefollowerisapointThefolloweriseasytobeworn.It’srarelyused.作者：潘存云教授Bythefollowerend’sshape Disk
