MAN MARINE DIESEL ENGINE MAN

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1、主题：翻译1、MANMARINEDIESELENGINEMAN ThelatestlargeboretwostorkeMAN,engineistheKSZ90/163Bseriesincylindernumberfrom6to12anddeveloping2,700kW(3,672HP)/cyl.Theengineoperatesat122r/min,withanM.E.Pof13barandameanpistonspeedof6.5m/s. ThebedplateisoffabricateddesignandconsistsofweoI-shapedlongitudin

2、algirderswithtransversemenbersintowhichthecaststeelbearinghousingsarewelded.Thethrustbearingcastingisincorporatedintothebedplate. Columnshavebeenreplacedbyframesconstructedofboxshapedlongitudinalgirders.Thewfabricatedtopandbottomsectionsrunthefulllengthoftheengineandaremountedonthebedplat

3、e.Suchanengineframehelpstostiffentheengineandsoprotectthebearingsfromthedeformationforcestransmittedviatheship'sdoublebottom.Thecastironguidewaysforthecrossheadareattachedtothetopsectionandsealoffthecrankcase. Thecylinderjacketsareindividualcastingsboltedtogethertoformonecontinuousmember.

4、Theonepiececylinderlinersarefittedintothejacketsfromthetopandacaststeelstrongbackisfittedinwayofthecombustionspacetohelpabsorbgasforces.ThescavengeprocessistheMANloopsystemandthescavengeandwxhaustportsarearrangedintwotiersandarecarriedfararoundtheliner.Theverticallandsbetweentheportsareco

5、oledbywaterpassinghroughcastintubesandhencetopassagesarrangedaroundthelinerabovetheexhaustports. Eachcylindercoverisintwoparts,thelowersectionisofspecialthinwalledforgedsteelpermittingtheareainwayofthecombustiongasestobeintensivelycooledwhilstabsorbingthermalstressesandthisisheldinpositio

6、nbyanuppersupportingunitofcastiron,whichtransmitsthegasforcestothecylinderjacketsvialongstuds.Thejointfacebetweenthecylindercoverandthelinerisarrangedasfarfromthecombustionprocessaspossible.Thegasloadsontheenginestructureareconstrainedbymeansofhydraulicpreloadedtierodswhichconnectthebedpl

7、ate,framesectionsandcylinderjacketsintoasingleunit. Thecrankshaftisofthesemi-builttybe,withthejournalbeingshrunkintotheforgedorcaststeelcrankthrows.Withtheexceptionofthesix-cylinderengine,itisintwoartsjoinedbyfittedbolts.Thecouplingflangeforattachmenttothepropellers