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1、西南交通大学本科毕业设计(论文)第20页摘要喷油泵是汽车柴油机上的一个重要组成部分。喷油泵总成通常是由喷油泵、调速器等部件安装在一起组成的一个整体。其中调速器是保障柴油机的低速运转和对最高转速的限制,确保喷射量与转速之间保持一定关系的部件。而喷油泵则是柴油机最重要的部件,被视为柴油发动机的“心脏”部件,它一旦出问题会使整个柴油机工作失常。喷油泵有直列式、分配式、单体式等三大类。喷油泵要有动力源才能运转,它下部的凸轮轴是由发动机曲轴齿轮带动的。由此可见,对柴油机喷油泵的设计及制造提出了严格的要求。本次毕业设计任务是对柴油机喷油泵的
2、工艺设计与夹具设计,在柴油机喷油泵零件的加工工艺过程中主要是对Φ8.7H7孔及Φ9H8孔和油泵内圆的加工,其中Φ8.7H7孔与内圆中心线之间、Φ9H8孔与油泵端面之间、Φ9H8孔与内圆中心线之间都有位置要求,因此采用专用夹具以毛坯外圆定位先加工内圆及Φ8.7H7孔,再以内圆及Φ8.7H7孔定位钻Φ9H8孔。在夹具的设计过程中,主要以支承钉、菱形销和定位心轴来定位,靠螺钉来实现夹紧。同时夹具可绕铰链回转,以便于装卸。关键字:喷油泵,工艺设计,夹具设计,定位,夹紧西南交通大学本科毕业设计(论文)第20页Dieselfuelinjec
3、tionpumpprocessdesignandfixturedesignABSTRACTDieselfuelinjectionpumpistheimportantconstituent.Fuelinjectionpumpassemblyisusuallycomposedoffuelinjectionpump,governor,etc.Partsofinstallationtogetherconsistingofawhole.Amongthemistheguaranteeofthedieselenginegovernor'ssp
4、eedandthehighestspeedlimitto,ensureinjectionvolumeandspeedoftherelationshipbetweenmaintaincertainparts.Andfuelinjectionpumpisthemostimportantelementofadieselengine,isconsideredasthe"heart"ofdieselengineparts,onceitisoutofthequestionwillmakethewholedieselengineworkdis
5、order.Fuelinjectionpumphaveinlinetype,distributiontype,monomerthreecategoriessuchastype.Fuelinjectionpumptohavepowertooperation,itisthebottomofthecamshaftdrivenbytheenginecrankshaftgear.Thisshows,ofdieselfuelinjectionpumpdesignandmanufacturinggivenstrictrequirements.
6、Thegraduationdesigntaskisondieselenginefuelinjectionpumptechnologydesignandfixturedesign,indieselenginefuelinjectionpumppartsprocessingtechnologyprocessismainlytotheΦ8.7H7holeandΦ9H8holesandoilpumpintheroundprocessed,theΦ8.7H7holeinthecenterline,withroundbetweenΦ9H8h
7、oleandoilpumpend,betweentheΦ9西南交通大学本科毕业设计(论文)第20页h8/21datedwithinthecenterlineoftheroundholebetweenallhavelocationrequirements,sothemethodwiththespecialfixtureblankcircleinthefirstroundandpositioningprocessingΦ8.7H7hole,thencircleandwithinΦ8.7H7holedrillingpositionin
8、gΦ9H8holes.Thefixturedesignprocess,mainlysupportingscrew,diamondpinandpositioningheartshafttolocate,relyontoachievetheclampingscrew