汽運一班2#618.ppt

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1、汽運一班2#618作業(yè)發(fā)動機(jī)的構(gòu)造成員：Carheart-engine汽車心臟——發(fā)動機(jī)一、Enginebasicknowledge發(fā)動機(jī)基本知識Theessenceofengine:Isakindofenergyconversionmechanism,itwillfuelcombustionproducesheatenergyintomechanicalenergy.Fourstrokegasolineengineisacylinder,pistonsystem,fuelinthecylinderofcombustion,andpromotethepistonmotion,

2、throughconnectingrodthenreciprocatingmotionintorotarymotion.發(fā)動機(jī)的本質(zhì):是一種能量轉(zhuǎn)換機(jī)構(gòu)，它將燃料燃燒產(chǎn)生的熱能轉(zhuǎn)變成機(jī)械能。四行程汽油機(jī)是一個氣缸-活塞系統(tǒng)，燃料在氣缸中燃燒，推動活塞運動，經(jīng)過曲柄連桿機(jī)構(gòu)再將往復(fù)運動轉(zhuǎn)換為旋轉(zhuǎn)運動。constituentelements組成部件profile1.機(jī)體組：Crankcase曲軸箱cylinderblock汽缸體headgasket汽缸墊cylinderhead氣缸蓋Cylinder氣缸vittaandwaterchanneloilsump1.blockgroup

3、:Istheengineframe,isinitinstalledenginemainpartsandaccessories,underallkindsofload.Thegroupofcylinderblock,crankcase,cylinderheadandcylinderpad,etc.1.機(jī)體組：是發(fā)動機(jī)的骨架，是在它的上面安裝著發(fā)動機(jī)的主要零件和附件，承受各種載荷。機(jī)體組由氣缸體、曲軸箱、氣缸蓋和氣缸墊等組成。Generalusegraycastironmoulds,theupperportionofthecylindricalcavitycalledcylind

4、er,thelowerbearingcrankshaftcrankcase,themcavityforcrankshaftmovementspace.Cylinderblockinternalcastmanystiffener,coolingwaterjacketandoilduct,etc.一般用灰鑄鐵鑄成，上部的圓柱形空腔稱為氣缸，下部為支承曲軸的曲軸箱，其內(nèi)腔為曲軸運動的空間。氣缸體內(nèi)部鑄有許多加強(qiáng)筋，冷卻水套和潤滑油道等?氣缸體：Threekindsofcylinderblock三種氣缸體generalexpression一般式gantrytype龍門式tunnel-

5、vision隧道式?cylinderhead氣缸蓋：Installedinthetopofthecylinderblock,fromuppersealcylinderandconstituteacombustionchamber.Havetheintakeandexhaustgateseat,valveguidehole,inletchannelandexhaustchannel.Theenginehasinstalledsparkplugtheholes,dieselenginewithinstallationoftheinjectorhole.安裝在氣缸體的上面，從上部密

6、封氣缸并構(gòu)成燃燒室。有進(jìn)、排氣門座，氣門導(dǎo)管孔，進(jìn)氣通道和排氣通道。汽油機(jī)有安裝火花塞的孔，柴油機(jī)有安裝噴油器的孔。?氣缸墊：Putinthecylinderandbetweenthecylinder,itsfunctionistoensurethatcylinderheadandcylinderblockcontactsealing,preventgasleakage,leakageandoilleakage裝在氣缸蓋和氣缸體之間，其功用是保證氣缸蓋與氣缸體接觸面的密封，防止漏氣，漏水和漏油?；钊B桿機(jī)構(gòu)Oneofthemostimportantpartsofengine.

7、Andconnectingrodwithwillfunctioninthepistonofgaspressureintorotatingpower.Atthesametime,drivedistributiondeviceandotherauxiliarydevice,suchasfan,waterpumps,generators,etc.發(fā)動機(jī)最重要的機(jī)件之一。與連桿配合將作用在活塞上的氣體壓力變?yōu)樾D(zhuǎn)的動力。同時，驅(qū)動配氣機(jī)構(gòu)和其它輔助裝置，如風(fēng)扇、水泵、發(fā)電機(jī)等。曲軸：END