平面連桿機(jī)構(gòu)planarlinkagemechanisms

平面連桿機(jī)構(gòu)planarlinkagemechanisms主講人：周會(huì)娜目錄CONTENTS1234平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism曲柄搖桿機(jī)構(gòu)及其應(yīng)用Crankrockermechanismanditsapplication雙曲柄機(jī)構(gòu)及其應(yīng)用Doublecrankmechanismanditsapplication雙搖桿機(jī)構(gòu)及其應(yīng)用Doublerockermechanismanditsapplication1平面四桿機(jī)構(gòu)的基本形式ThebasicformofplanarfourbarmechanismONE一、平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism若干構(gòu)件通過(guò)低副(轉(zhuǎn)動(dòng)副或移動(dòng)副)聯(lián)接所組成的機(jī)構(gòu)稱作連桿機(jī)構(gòu)。Themechanismcomposedofseveralcomponentsconnectedbylowpairs(rotatingormovingpairs)iscalledalinkagemechanism.平面連桿機(jī)構(gòu)planarlinkagemechanisms空間連桿機(jī)構(gòu)Spatiallinkage一、平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism全由低副(轉(zhuǎn)動(dòng)副、移動(dòng)副)構(gòu)成的平面機(jī)構(gòu)稱為平面連桿機(jī)構(gòu)。Aplanarmechanismcomposedentirelyoflowpairs(rotatingpairs,movingpairs)iscalledaplanarlinkagemechanism.曲柄搖桿機(jī)構(gòu)crank-rockermechanism曲柄滑塊機(jī)構(gòu)Crankslidermechanism一、平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism完全由低副(轉(zhuǎn)動(dòng)副、移動(dòng)副)構(gòu)成的平面機(jī)構(gòu)稱為平面連桿機(jī)構(gòu)。Aplanarmechanismcomposedentirelyoflowpairs(rotatingpairs,movingpairs)iscalledaplanarlinkagemechanism.完全由低副(轉(zhuǎn)動(dòng)副、移動(dòng)副)構(gòu)成的平面機(jī)構(gòu)稱為平面連桿機(jī)構(gòu)。Aplanarmechanismcomposedentirelyoflowpairs(rotatingpairs,movingpairs)iscalledaplanarlinkagemechanism.完全由低副(轉(zhuǎn)動(dòng)副、移動(dòng)副)構(gòu)成的平面機(jī)構(gòu)稱為平面連桿機(jī)構(gòu)。Aplanarmechanismcomposedentirelyoflowpairs(rotatingpairs,movingpairs)iscalledaplanarlinkagemechanism.曲柄搖桿機(jī)構(gòu)crank-rockermechanism曲柄滑塊機(jī)構(gòu)Crankslidermechanism一、平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism基本型式一一鉸鏈四桿機(jī)構(gòu)BasicType-ChainFourBarMechanism一、平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism一、平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism機(jī)架連架桿連架桿sidelinksidelinkrack基本型式一一較鏈四桿機(jī)構(gòu)BasicType-ChainFourBarMechanism一、平面四桿機(jī)構(gòu)的基本形式Thebasicformofplanarfourbarmechanism基本型式一一較鏈四桿機(jī)構(gòu)BasicType-ChainFourBarMechanism曲柄搖桿連桿crankconnectingrodrocker在鉸鏈四桿機(jī)構(gòu)中，按連架桿能否作整周轉(zhuǎn)動(dòng)，可將鉸鏈四桿機(jī)構(gòu)分為:Inthehingefourbarmechanism,thehingefourbarmechanismcanbedividedinto:一、平面四桿機(jī)構(gòu)的基本形式ThebasicformofplanarfourbarmechanismMachiningmachinetool加工機(jī)床manipulator機(jī)械手excavator挖掘機(jī)2曲柄搖桿機(jī)構(gòu)及其應(yīng)用CrankrockermechanismanditsapplicationTWO二、曲柄搖桿機(jī)構(gòu)及其應(yīng)用Crankrockermechanismanditsapplication兩個(gè)連架桿Twoconnectingrods一個(gè)為曲柄，作勻速轉(zhuǎn)動(dòng)Oneisacrankthatrotatesataconstantspeed一個(gè)為搖桿，作變速往復(fù)擺動(dòng)Oneisarocker,whichperformsvariablespeedreciprocatingswing曲柄搖桿機(jī)構(gòu)crank-rockermechanism二、曲柄搖桿機(jī)構(gòu)及其應(yīng)用Crankrockermechanismanditsapplication汽車前窗雨刮器攪拌機(jī)機(jī)構(gòu)雷達(dá)俯仰角度調(diào)整裝置CarfrontwindowwiperMixermechanismRadarpitchangleadjustmentdevice3雙曲柄機(jī)構(gòu)及其應(yīng)用DoublecrankmechanismanditsapplicationTHREE三、雙曲柄機(jī)構(gòu)及其應(yīng)用Doublecrankmechanismanditsapplication兩連架桿均為曲柄的四桿機(jī)構(gòu)是雙曲柄機(jī)構(gòu)?？蓪⒃瓌?dòng)曲柄的等速轉(zhuǎn)動(dòng)轉(zhuǎn)換成從動(dòng)曲柄的等速或變速轉(zhuǎn)動(dòng)。Afourbarmechanismwithtwoconnectingrodsthatarebothcranksisadoublecrankmechanism.Theconstantspeedrotationoftheoriginalcrankcanbeconvertedintoconstantorvariablespeedrotationofthedrivencrank.雙曲柄機(jī)構(gòu)Doublecrankmechanism三、雙曲柄機(jī)構(gòu)及其應(yīng)用Doublecrankmechanismanditsapplication慣性篩機(jī)構(gòu)Inertiascreenmechanism三、雙曲柄機(jī)構(gòu)及其應(yīng)用DoublecrankmechanismanditsapplicationAB桿和CD桿，桿長(zhǎng)相等且平行AD桿和BC桿，桿長(zhǎng)相等且平行ABrodandCDrod,rodlengthequalandparalleltoADrodandBCrod,rodlengthequalandparalleltoBCrod因此，主動(dòng)曲柄和從動(dòng)曲柄的瞬時(shí)角速度相等，連桿始終作平動(dòng)Therefore,theinstantaneousangularvelocitiesoftheactiveanddrivencranksareequal,andtheconnectingrodalwaysperformstranslationalmotion特例1--平行四邊形機(jī)構(gòu)Specialcase1-parallelogrammechanism三、雙曲柄機(jī)構(gòu)及其應(yīng)用Doublecrankmechanismanditsapplication特例1--平行四邊形機(jī)構(gòu)Specialcase1-parallelogrammechanism機(jī)車車輪聯(lián)動(dòng)機(jī)構(gòu)Locomotivewheellinkagemechanism三、雙曲柄機(jī)構(gòu)及其應(yīng)用Doublecrankmechanismanditsapplication相對(duì)邊長(zhǎng)相等但其中一對(duì)不平行EqualrelativesidelengthsButonepairisnotparallel特例2一一反平行四邊形機(jī)構(gòu)Specialcase2-antiparallelogrammechanism三、雙曲柄機(jī)構(gòu)及其應(yīng)用Doublecrankmechanismanditsapplication相對(duì)邊長(zhǎng)相等但其中一對(duì)不平行EqualrelativesidelengthsButonepairisnotparallel車門啟閉機(jī)構(gòu)保證兩扇車門同時(shí)開(kāi)啟和關(guān)閉DooropeningandclosingmechanismEnsurethatbothcardoorsopenandclosesimultaneously特例2一一反平行四邊形機(jī)構(gòu)Specialcase2-antiparallelogrammechanism4雙搖桿機(jī)構(gòu)及其應(yīng)用DoublerockermechanismanditsapplicationFOUR四、雙搖桿機(jī)構(gòu)及其應(yīng)用Doublerockermechanismanditsapplication兩根連架桿只能在一定范圍內(nèi)左右擺動(dòng)Twoconnectingrodscanonlyswingleftandrightwithinacertainrange沒(méi)有曲柄Nocrank雙搖桿機(jī)構(gòu)double-rockermechanism港口鶴式起重機(jī)Portcrane四、雙搖桿機(jī)構(gòu)及其應(yīng)用Doublerockermechanismanditsapplication兩搖桿長(zhǎng)度相等地雙搖桿機(jī)構(gòu)DoubleRockerMechanismwithEqualLengthofTwoRockers特例一一等腰梯形機(jī)構(gòu)Specialcase-isoscelestrapezoidalmechanism四、雙搖桿機(jī)構(gòu)及其應(yīng)用Doublerockermechanismanditsapplication兩搖桿長(zhǎng)度相等地雙搖桿機(jī)構(gòu)DoubleRockerMechanismwithEqualLengthofTwoRockers兩搖桿長(zhǎng)度相等地雙搖桿機(jī)構(gòu)當(dāng)整個(gè)車子轉(zhuǎn)向時(shí)，保證四個(gè)輪子都是純滾動(dòng)，從而可以避免輪胎因滑動(dòng)而產(chǎn)生過(guò)大磨損。Thedoublerockermechanismwithequallengthsoftworockerrodsensuresthatallfourwheelsarepurerollingwhentheentirecarturns,therebyavoidingexcessivetirewearduetosliding.四、雙搖桿機(jī)構(gòu)及其應(yīng)用Doublerockermechanismanditsapplication汽車前輪轉(zhuǎn)向機(jī)構(gòu)Frontwheelsteeringmechanismofautomobiles5課程總結(jié)CourseSummaryFIVE優(yōu)點(diǎn):Advantages:面接觸，承載能力強(qiáng)，耐磨損Facecontact,strongload-bearingcapacity,andwearresistance易于制造和獲得較高制造精度Easytomanufactureandachievehighmanufacturingaccuracy能實(shí)現(xiàn)多種運(yùn)動(dòng)規(guī)律Abletoachievemultiplemotionpatterns可實(shí)現(xiàn)不同軌跡要求Canachievedifferenttrajectoryrequirements四、雙搖桿機(jī)構(gòu)及其應(yīng)用Doublerockermechanismanditsapplication缺點(diǎn):Disadvantages:累計(jì)運(yùn)動(dòng)誤差較大，機(jī)械效率低;Accumulatedmotionerrorislar