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广东技术师范学院天河学院本科毕业设计外文翻译译文学生姓名院（系）广东技术师范学院天河学院专业班级机械设计制造及其自动化指导教师完成日期外文出处：–axisaxialpistonpumpThepumpingactionoftheaxialpistonpumpismadepossiblebyauniversaljointorlink.Figure4-15isaseriesofdrawingsthatillustrateshowtheuniversaljointisusedintheoperationofthispump.First,arockerarmisinstalledonahorizontalshaft.(Seefig4-15viewA)Thearmisjoinedtotheshaftbyapinsothatitcanbeswungbackandforth,asindicatedinviewB。Next,aringisplacedaroundtheshaftandsecuredtotherockerarmsotheringcanturnfromlefttorightasshowninviewC,Thisprovidestworotarymotionsindifferentplanesatthesametimeandinvaryingproportionsasmaybedesired.Therockerarmcanswingbackandforthinonearc,andtheringcansimultaneouslymovefromlefttorightinanotherarc,inaplaneatrightanglestotheplaneinwhichtherockerarcturns.Next,atiltingplateisaddedtotheassembly.Thetiltingplateisplacedataslanttotheaxialoftheshaft,asdepictedinfigure4-15,viewD.Therockerarmisthenslantedatthesameangleasthetiltingplate,sothatitliesparalleltothetiltingplate.Theringisalsoparallelto,andincontactwith,thetiltingplate.Thepositionoftheringinrelationtotherockerarmisunchangedfromthatshowninfigure4-15,viewC.Figure4-15viewEshowstheassemblyaftertheshaft,stillinahorizontalposition,hasbeenrotatedaquarterturn.TherockerarmisstillinthesamepositionasthetiltingplateandoscarnowperpendiculartotheaxialoftheshaftTheringhasturnedontherockerpinstripe,sothatithaschangeditspositioninrelationtotherockerarm,butitremainsparallelto,andincontactwiththetiltingplate.ViewFoffigure4-15showstheassemblyaftertheshafthasbeenrotatedanotherquarterturn.ThepartsarenowinthesamepositionasshowninviewD,butwiththeendsoftherockerarmreversed,Theringstillbearsagainstthetiltingplate.Astheshaftcontinuestorotate,therockerarmandtheringturnabouttheirpivots,witheachchangingitsrelationtotheotherandwiththeringalwaysbearingontheplate.Figure4-15,viewGwheeladdedtotheassembly.Thewheelisplaceduprightandfixedtotheshaft,sothatrotateswiththeshaft.Inaddition,tworodsAandB,arelooselyconnectedtothetiltingringandextendthroughtwoholessandingoppositeeachotherinthefixedwheel.Astheshaftisrotated,thefixedwheelturnsperpendiculartotheshaftatalltimes.Thetiltingringrotateswiththeshaftandalwaysremainstilted,sinceitremainsincontactwiththetiltingplate.ReferringtoviewG,thedistancealongrodA,fromthetiltingringtothefixedwheel,isgreaterthanthedistancealongrodB.Astheassemblyisrotated,however,thedistancealongrodAdecreasesasitspointofattachmenttothetiltingringmovesclosertothefixedwheel,whilethedistancealongrodBincreases.Thesechangescontinueuntilafterahalfrevolution,atwhichtimetheinitialpositionsoftherodshavebeenreversed.Afteranotherhalfrevolution,thetworodswillagainbeintheiroriginalpositions.Astheassemblyrotates,therodsmoveinandoutthroughtheholesinthefixedwheel.Thisisthewaytheaxialpistonpumpworks.Togetapumpingaction,placepistonsattheendsoftherods,beyondthefixedwheelandinsertthemintocylinder.Therodsmustbeconnectedtothepistonsandtothewheelbyballandsocketjoints.Astheassemblyrotates,eachpistonmovesbackandforthinitscylinder.Suctionanddischargelinescanbearrangedsothatliquidentersthecylinderwhilethespacesbetweenthepistonheadsandthebasesofthecylinderareincreasingandleavesthecylinderduringtheotherhalfeachrevolutionwhenthepistonsaremovingintheoppositedirection.Themainpartsofthepumparethedriveshaft,pistons,cylinderblock,andvalveandswashplates,Therearetwopartsinthevalveplate.ThesePortsmouthconnectdirectlytoopeningsinthefaceofthecylinderblock.Fluidisdrawnintooneportandforcedouttheotherportbyt