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中国矿业大学2008届本科生毕业设计第1页翻译部分英文原文HydraulicpumpAbstract:Ahydraulicpumpunitisencasedbetweenapumpbodyandapumpcover.Abearingholepassesthroughthepumpbodyandisformedinthepumpbody.Adriveshaftandabearingbushareinsertedintothebearinghole.Thedriveshaftdrivesthehydraulicpumpunitandthebearingbushsupportsthedriveshaft.Atanendportionofthebearinghole,asealchamberisformed.Thesealchamberencasesasealmember.Anoilgrooveisformedinsidethebearinghole.Theoilgrooveconnectsthehydraulicpumpunitsidewiththesealchamberandcarrieshydraulicoilforlubrication.Theoilgrooveisformedinsuchamannerthatasectionalareainthesealchambersideisgreaterthanasectionalareainthehydraulicpumpunitside.Thebearingbushcomprisesapluralityofbushpiecesarrangedatapredeterminedintervalinanaxialdirectionofthebearinghole.SUMMARYOFTHEINVENTIONThefollowingisanexplanationofoneembodimentappliedtoahydraulicpumpofapowersteeringofthepresentinventionwithreferencetothedrawings.中国矿业大学2008届本科生毕业设计第2页Inthedrawings,areferencenumeral1denotesapumpbodymadeofmetallicmaterialssuchasaluminumalloyandsoonandareferencenumeral2denotesapumpcovermadeofmetallicmaterials.Thepumpbody1andthepumpcover2encaseahydraulicpumpunit3.Thatis,anannularconcaveportion4isformedbetweenthepumpbody1andthepumpcover2.Thehydraulicpumpunit3isinstalledintheannularconcaveportion4.Inthisembodiment,thehydraulicpumpunit3isavanehydraulicpumpunit.Thehydraulicpumpunit3includesacamring7encasingarotor6.Therotor6comprisesapluralityofvanes5whichareradiallymovableinandout.Bothsidesofthecamring7areguidedbysideplates8and9.Apumpingchamber10isformedbytwoadjacentoneofthevanes5betweenthecamring7andtherotor6.Thevolumeofthepumpingchamber10variesbytherotationoftherotor6.Withthisvariation,aninhalingzoneisformedinaportionincreasinginvolumeandadischargingzoneisformedinaportiondecreasinginvolume.Notchpassages8aand8bareformedinthesideplates8and9.Thesideplates8and9facethedischargingzone.Thenotchpassages8aand9aopenradiallyandoutwardly.Theoildischargedfromthepumpisdischargedintoadischargingchamber(ahighpressurechamber)11oftheannularconcaveportion4oftheoutercircumferenceofthecamring7.Aninhalingportnotshowninthedrawingisformedinthesideplate9facingtheinhalingzoneandpassestherethrough.Abearinghole12isformedinthepumpbody1andpassesthroughthepumpbody1.Asealchamber13isformedinanendportionofthebearinghole12.Anoilgroove14communicatingfromthehydraulicpumpunit3sidetothesealchamber13isformedinthebearinghole12.Thesectionoftheoilgroove14isacirculararc.thesectionalareaoftheoilgroove14inthesealchamber13sideisgreaterthanthesectionalareaoftheoilgroove14inthehydraulicpumpunit3sideanditiseasytoformtheoilgroove14inacastingmold.Theoilgroove14inthisembodimentisdividedatasubstantiallycenterpositionofthebearinghole12.However,becausethesubstantiallycenterpositionofthebearinghole12ispositionedbetweenapluralityofbushpieceslater-mentioned,thesubstantiallycenterpositionofthebearinghole12issubstantiallycommunicatedwithanintervalbetweenthebushpieces.Becausetheoilgroove14isdividedatthesubstantiallycenterpositionofthebearinghole12,thisdividedpartbecomesaso-calledlabyrinthandaflowresistanceisappliedtohydraulicoilflowingintheoilgroove14.Therefore,itispossibletodecreasetheenergyofthehydraulicoilflowingintothesealchamber13.Theoilgroove14canbecontinuouslyformedwithoutdividingatthesubstantiallycenterpositionofthebearinghole12.Theoilgroove14canbecontinuouslyformedinatapershapesothatthesectionalareaincreasesgraduallyfromthehydraulicpumpunit3sidetothesealchamber13side.Withthisstructure,theoilgroove14canleadtheleakageoilfromthebearinghole12ofthehydraulicpumpunit3tothesealchamber13.Theleakageoilfromthehydraulicpumpunit3isthehydraulicoilleakingbetweentherotor6andthesideplates8and9andisalittle中国矿业大学2008届本科生毕业设计第3页hydraulicoilleakingfromthejointbetweenthepumpbody1andthesideplate9.Aninhalingpassage15,adischargingpassage16andaspoolvalvereceivingbore17areformedinthepumpbody1.Theinhalingpassage15connectseachpumpingchamber10oftheinhalingzonewithastoragetanknotshowninthedrawing.Thedischargingpassage16connectseachpumpingchamber10ofthedischargingzonewiththeactuatorofthepowersteeringnotshowninthedrawing.Oneendofthespoolvalvereceivingbore17issealed.Theinhalingpassage15isbranchedintotwodirectionsatthejointfacingthesideplate9.Attheendportionoftheinhalingpassage15,acirculararcshapeinhalingport18isformed.Theinhalingport18isformedsothattheinhalingport18facestheinhalingport,notshowninthedrawing,formedinthesideplate9.Theinhalingpassage15isconnectedwiththesealchamber13throughalowpressurepassage19.Thelowpressurepassage19issubstantiallyparallelwiththebearinghole12.Thedischargingpassage16isbentradiallyandoutwardlyatthejointfacingthesideplate9.Anorificepassage21connectedwithaninhalingport20formedinthesideplate9isformedinthedischargingpassage16.Areferencenumeral22denotesabearingbushinsertedintothebearinghole12.Thebearingbush22comprisesapluralityofbushpieces23positionedatapredeterminedintervalintheaxialdirectionofthebearinghole12.Inthisembodiment,thebearingbush22comprisestwobushpieces23positionedattheinterval1intheaxialdirectionofthebearinghole12.Thebushpiece23isformedintoacylindricalshapebyroundingaplatemember.Theinnersurfaceofthebearingbush22issmooth.Theoilgrooveisnotformedinthebearingbush22.Theinterval1betweenthetwo-bushpieces23formingthebearingbush22ispreferabletobesubstantially1/3oftheaxiallengthLofthebearingbush22inordertosecuretheareaforsupportingthebearingbush22.Inthisembodiment,theinterval1betweenthebushpieces23issubstantially1/5oftheaxiallengthLofthebearingbush22.Areferencenumeral25denotesadriveshaftfordrivingthehydraulicpumpunit3.Thedriveshaft25isinsertedintothebearinghole12insuchamannerthatthedriveshaft25issupportedbythebearingbush22.Thedriveshaft25hasserrations26formedneartheforwardend.Theserrations26passthroughthethroughhole9bofthesideplate9andarefittedintheserrationhole27oftherotor6.Withthis,thedriveshaft25iscapableofdrivingtherotor6ofthehydraulicpumpunit3.Theforwardendportionofthedriveshaft25istaperedandlooselyfittedinthethroughhole8bofthesideplate8.Aspoolvalve30controllingthequantityoftheoilisslidablymovableandisfittedinthespoolvalvereceivingbore17.Thespoolvalve30dividestheinsideofthespoolvalvereceivingbore17intoafirstpressurechamber17aandasecondpressurechamber17b.Thespoolvalve30isnormallybiasedtowardthefirstpressurechamber17asidebyaspringforceofacontrolspring31.Thecontrolspring31isencasedinthesecondpressurechamber17b.Thespoolvalve30closesadrainpassage33connectingtheinhalingpassage15inanormalcondition.中国矿业大学2008届本科生毕业设计第4页Inthepumpbody1,apassage35isformed.Thepassage35isconnectedwithadischarginglotnotshowninthedrawinginordertoconnectwiththedischargingpassage16andtoleadhydraulicoiltothepowersteering,thatis,theactuatornotshowninthedrawing.Thepassage35isconnectedwiththesecondpressurechamber17bthroughapassage36.Thepressureinthedischargingpassage16isledintothesecondpressurechamber17b.Areferencenumeral39denotesapressureswitchmountedonthepumpcover2.Thepressureswitch39comprisesafixedcontact39aandamovingcontact39b.Thepressureswitch39isabletooperateaccordingtothepressureofthedischargingchamber11becausetheendportionofthemovingcontact39bfacesapassage40connectingwiththedischargingchamber11.Thepressureswitch39isthrustintoandfixedintheinsideofaconcaveportion41.Theinsideoftheconcaveportion41isconnectedwiththethroughhole9bofthesideplate9througharadialpassage42andanaxialpassage43.Thepumpbody1andthepumpcover2areconnectedandfixedwitheachotherbyboltsnotshowninthedrawing.Thejointbetweenthepumpbody1andthepumpcover2issealedbyasealring44soastopreventthehydraulicoildischargedintothedischargingchamber11fromleakingtotheoutside.Areferencenumeral45denotesasealringinstalledbetweenthepumpcover2andthesideplate8.Thesealring45separatesthedischargingchamber11fromthethroughhole8bofthesideplate8.Areferencenumeral46denotesasealmember.Thesealmember46isinstalledinthesealchamber13andsealsthedriveshaft25.Withthisstructure,thedriveshaft25isrotationallydriventhroughthepulleynotshowninthedrawingandtherotor6connectedwiththedriveshaft25isrotationallydriven.Whentherotor6isrotationallydriven,withtherotationoftherotor6,thevolumeoftheinhalingzoneincreasesandthevolumeofthedischargingzonedecreases.Hydraulicoilisinhaledfromtheinhalingpassage15throughtheinhalingport18intothepumpingchamber10intheinhalingzone,passesthroughthepumpandisdischargedfromthepumpingchamber10inthedischargingzoneintothedischargingchamber11.Thehydraulicoildischargedinto