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1、Chapter9DesignofHydraulicTransmissionSystem9.1TheApproachforHydrostaticCircuitsDesign9.2ADesignExampleofHydraulicSystemIntroductionThedesignofhydrostatictransmissionsystemsisanimportantpartofthewholemechanicaldesignandalsoasummarizingandcomprehensiveapplicationofknowledgeinpreviouschapte
2、rs.Theaimofthischapteristoshowthroughanexamplehowhydrostatictransmissioncircuitscanbedesignedtosatisfyagivensetofrequirements.9.1TheApproachforDesignofHydrostaticsystems9.1.1Determinationofdesignedrequirements9.1.2Analysisforworkingconditionsanddeterminationofmainparameters9.1.3Thedeterm
3、inationofhydraulicsystemdiagram9.1.4Hydrauliccomponentscalculationandselection9.1.5Performancecheckforahydraulicsystemdesigned9.1.6Drawingofworkingdiagramsandtechnicaldocuments9.1TheApproachforDesignofHydrostaticsystemsFig.9-1Generaldesignprocessforahydraulictransmissionsystem9.1.1Determ
4、inationofdesignedrequirementsBeforeahydraulicsystemisdesigned,theworkingconditionsofthemainframeinthemechanicalequipmentmustbeanalyzed.1.Thepurposeofthemainframe,theoverallarrangement,thelimitationstothepositionofthehydraulicdevicesandtheirsizes.2.Themainframeworkcycle,thesystemactions,t
5、heirsequence,interlockfunction,automatization.3.Theloadonactuatorsandtherangesofspeed,motionstability,positionaccuracy,conversionaccuracy,etc.4.Workingenvironmentandworkingconditions.5.Workingefficiency,safety,reliability,cost,etc.9.1.2Analysisforworkingconditionsanddeterminationof mainp
6、arametersAnalysisofworkingconditions1）DynamicparametersanalysisAloaddiagramcanbedrawnoutbasedonthedeterminedextrinsicloads,seeFig.9-2a,whichisloadchart.Theloadchartisactuallyaload-displacement（F-l）curve.a)Loadchartb)SpeedchartFig.9-2Loadchartandspeedchartofactuators1-Startupacceleration2
7、-Quickfeed3-Workingfeed4-Brake5-Friction6-Cuttingforce7-Sealandbackpressureresistance8-Inertiaforce2）MovementparametersanalysisFig.9-2bisaspeed-displacement（v-l）curvedrawntoexpressthespeedofeachactuatorindifferentphases,itiscalledspeedchart.Whentheactuatorworksinlinerecip
