valve timing measurement 气门正时测量

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1、ValveTimingMeasurement气门正时测量2010-05-0622:39:42View:85Purpose目的The performance and emissions behaviour of any internal combustion engine is heavily dependant upon timing, lift and duration of the inlet and exhaust valves任何内燃机的性能和排放指标主要依Purpose目的Theperformanceandemissionsbehaviourofanyinternalc

2、ombustionengineisheavilydependantupontiming,liftanddurationoftheinletandexhaustvalves任何内燃机的性能和排放指标主要依赖于进排气门打开时间,升程,打开持续时间 Equipment测量设备 -Crankshaftanglegauge曲轴角度测量仪-Dialtestindicator  杠杆千分表(DTI)-DTImountingbracketDTI安装支架-Suitablestylusextensionbar(toreachthepiston)合适的延伸杆（以延伸到活塞） Measurementof

3、ValveMaximumOpeningPoint(alsoknownasValvePeakorMOP)气门最大打开点测量(气门最大升程) Inadditiontotheequipmentlistedabove,asmallerprobewillberequiredformeasuringthevalveposition. 除了以上设备，还需要一个很小的探针以测量气门位置 Step步骤1Rotatetheenginecrankshaft,sothatthepistonincylindernumberoneisatTopDeadCenter,thisshouldbemeasuredu

4、singthecrankshaftanglegauge.转动发动机曲轴，因此通过测量曲轴角度测量仪让第一缸的活塞到达上止点 Step步骤2Rotatetheenginecrankshaftfurtheruntilthevalveisopenedtoitsmaximumopeningpoint. Judgethemaximumopeningvisually.继续转动发动机曲轴直到气门达到最大打开点。目视确认最大开启量 Step步骤3InstalltheDTIonthefirstvalvetobemeasured,ensuringthatthegaugeismountedparall

5、eltotheaxisofthevalveandaround75%loaded.TheDTIprobeshouldbeincontactwithaflatareaofeitherthetappetorthespringretainer.Zerothegauge.将DTI安装于首个待测气门上，取保量规平行于气门的中心轴并加载约75％。DTI的探针应置于挺柱或锁夹的平面上。清零。 Step步骤4Slowlyrotatethecrankshaftintheclockwisedirection(normalrotation)untilthevalveliftis0.5mmbeforeth

6、ehighestpoint.Notethereadingfromthecrankshaftanglegauge.缓慢顺时针方向（通常转动方向）转动曲轴直到气门升程达到最高点前0.5mm，记录曲轴角度测量仪读数 Step步骤5Slowlyrotatethecrankshaftfurtherintheforwarddirection,untilthegaugemovesoverthemaximumvalveliftpositionandfallsto0.5mmafterthemaximumliftposition.Again,notethecrankshaftanglegaugere

7、ading.继续缓慢转动曲轴直到气门越过最大位置并回落0.5mm，再次记录曲轴角度测量仪读数 Step步骤6Themaximumvalveliftwillbethemean(average)ofthetwotimingreadings.Calculatetheaverageofthetworeadingsbyaddingthemtogetheranddividingtheresultbytwo.Recordthisvalue.最大气门升程将取两次读数的平均值。将两次读数相加，再除