Injini ye-Audi 4.2 v8 - ukucaciswa kwe-powertrain

Injini engu-4.2 V8 ine-angle yemfoloko engu-90°. Ezinye izici ezikhethekile zifaka isikhala sesilinda esingu-90 mm kanye nendawo yeketango lesikhathi ohlangothini lwe-clutch. Iyunithi ye-4.2 V8 ibhekwa njengeguquliwe kuphela, ngoba onjiniyela bomkhiqizi waseJalimane basebenzisa isipiliyoni esicebile esihlobene nokusebenza nokukhiqizwa kwamamodeli enjini yangaphambilini.

4.2 Injini ye-V8 - idatha yobuchwepheshe

Iyunithi yamandla yanikezwa igama elithi BVN. Ukususwa sekukonke kwaba ngu-4134 cm3 namandla angu-240 kW (360 hp), i-bore engu-83 mm kanye ne-piston stroke engu-95,5 mm ene-compression ratio engu-16,4:1. Okunye okufanele kukhulunywe ngakho yi-oda lokudubula: 1-5-4-8-6-3-7-2. Isisindo seyunithi yokushayela sasingu-255 kg.

Injini isebenzisa isistimu yokulawula ye-Bosch - imodeli ye-EDC-16 CP +, kanye nesistimu ye-Common-Rail enengcindezi yomjovo efika ku-1600 bar kanye nemibhobho enezimbobo eziyi-8. Isixazululo sokubuyisela igesi exhaust saphinde samukelwa ngesipholile segesi ekhipha amanzi ephuma emanzini kanye nesistimu yokuhlanza equkethe ama-catalyst e-oxidation amabili kanye nesihlungi se-diesel particulate (DPF) esingalondolozi lutho. Ukukhishwa kwe-exhaust bekuhambisana nezindinganiso ze-Euro IV.

Dizayina izixazululo kudrayivu

Abaqambi bakhetha ikesi elenziwe nge-vermicular cast iron, elihlukaniswe eduze kwe-axis ye-crankshaft. Ingxenye engezansi isebenzisa ifreyimu eqinile, okuyizindlu zamakepisi athwalayo. Ngenxa yalezi zixazululo, kanye nezinto zokusetshenziswa ezisetshenzisiwe, isisindo se-4.2 V8 sesilula kakhulu ngamakhilogremu angu-10 uma kuqhathaniswa nenguqulo engu-4.0 litre.

I-crankshaft yenjini yenziwe ngensimbi engu-42 CR MO S4 futhi yafakwa iphrofayili ukuze ama-torque e-oda lokuqala nelesibili alingane. Ingxenye ishumekwe kuma-bearings angu-5. Kufanele futhi kuqashelwe ukuthi i-transition radii yama-crankpins iphinde yacindezelwa ukuze kwandiswe amandla e-crankshaft.

Ukwakhiwa kwemoto kuthinta isiko eliphezulu lomsebenzi

Esinye sezinqumo eziyinhloko kulesi sici kwakuyisistimu ye-crank-piston elinganiselwe kahle, eyayingathinteki ukudlidliza, ukuze injini ingakhiqizi umsindo omkhulu. Ngaphezu kwalokho, isisindo esengeziwe se-torsional vibration damper nepuleti lokushayela kunikeza ibhalansi efanelekile yeyunithi yamandla. 

Izinga eliphezulu lenjini engu-4.2 V8 liphinde lathonywa yindlela isilinda esiyikhanda enziwe ngayo, ebolekwe kuhlobo lwe-3.0 L V6. Inama-valve amane isilinda, ama-camshaft agoqayo, ukulungiswa kwe-hydraulic lash, izingalo ze-roller rocker kanye ne-spur lash adjustment sprockets.

Ngenxa yokuthi izigqoko ezithwalayo zakha ifreyimu evamile ene-flat sealing surface, futhi impahla ye-cap iyipulasitiki, futhi ukuqiniswa kwezakhi kunamandla, ukukhishwa kwe-acoustic okuhle kakhulu kwengxenye kuqinisekiswa.

Isistimu yokupholisa esebenzayo

Iqukethe ipompo yamanzi kanye ne-thermostat, efakwe endlini evamile etholakala ngaphandle kweyunithi yokushayela. Iphampu ishayelwa uchungechunge D ngamashafti amabili namagiya epompo likawoyela.

Ibhantshi lamanzi lifinyelela ku-hull ngokusebenzisa izimbobo zomjovo ezimbili ezinikezela ngokupholisa emaceleni angaphandle ebhulokhi yesikhungo samandla. Abaqoqi bamanzi baphonswa ezinhlangothini zombili zalesi sici, ngayinye enezimbobo ezine lapho into inikezwa khona.

Inqwabelana ekamelweni phakathi kwama-cylinder banks futhi igeleze iye kurediyetha noma ngokuqondile ohlangothini lokumunca lwephampu yamanzi, kuye ngezilungiselelo ze-thermostat.

Isistimu ye-exhaust iyashintsha ukusuka ku-DPF

4.2 I-V8 isebenzisa izinguquko uma iqhathaniswa nezinguqulo zangaphambilini. Lokhu kubhekisela ekusetshenzisweni kokusekelwa kwe-carborundum enezindonga ezincane. Ngenxa yokuthi ukuqina kodonga kuncishiswe ngo-37% uma kuqhathaniswa nenguqulo ye-3.0L V8, indawo esebenzayo ye-catalyst iyanda.

Lokhu kunciphisa ingcindezi ye-exhaust back futhi kunciphise isikhathi sokuvuselela isihlungi. Le nqubo iphinde yenza kube nokwenzeka ukufeza ukuvuselelwa kwengxenye kakade ekushiseni kwe-580-600 ° C ngenkathi kugcinwa i-backpressure ephansi yegesi yokukhipha.