Iyini i-DOHC?

I-DOHC isifinyezo esisho i-Double Overhead Camshaft noma I-camshaft engaphezulu ephindwe kabili. Uhlobo lwezinjini lapho ama-camshaft amabili atholakala kumakhanda angama-cylinder, ukuhambisa ama-valve ngokuqondile.

Empeleni ziyingxenye yezinjini ze-OHC. Ama-Acronyms ngesiNgisi asho nje i-Overhead Camshaft noma i-camshaft ekhanda Lezi zingahlukaniswa zibe yilezo ezine-camshaft eyodwa kuphela, i-Single Overhead Camshaft (SOHC), noma lezo ezinama-camshaft amabili (DOHC), okuyizo esizobhekana nazo kulesi sihloko.

Ukusuka ku-OHV kuye ku-OHC bese kuya ezinjinini ze-DOHC

Ngokwesiko, i-camshaft yayisezansi, eduze kwe-crankshaft, ngakho kwakukude kakhulu nama-valve. Ngenxa yalesi sizathu, kwakudingeka kusebenze ama-pushers anyakazayo izingalo ze-rocker, zona, eziphusha ama-valve. Ngakho bathola igama I-Overhead Valve (OHV), okuyinto ngeSpanishi ehumusha ngokuthi Amavalvu ekhanda lesilinda.

Noma kunjalo ezinye izimoto ezindala zisasebenzisa amasistimu e-OHV, umkhuba ovamile namuhla ukwamukela umklamo Cmb ngezinzuzo zayo eziningi. Ivumele ukuthuthuka ekusebenzeni kukonke kwenjini, ngoba isuse izingxenye eziningi ezihambayo, ngaleyo ndlela yehlisa uquqaba olungenayo ekusabalaliseni. Kodwa futhi ukuthi yenza kube lula ukuqaliswa kwezinhlelo zokusabalalisa eziguquguqukayo, ezisetshenziswa kabanzi namuhla ekusebenzeni kwazo okuthuthukisiwe nokusebenza kahle.

Ngaphezu kwakho konke lokhu, amasistimu ane i-camshaft ephindwe kabili I-DOHC siphinde sigcizelele izinzuzo zama-OHC. Isibonelo, bavumela ukulawulwa kwenjini okukhulu, ngokusebenzisa i-shaft eyodwa yokudonsa kanye neyodwa yokukhipha umoya. I-akhawunti enhle yayo inikeza injini ye-Honda DOHC VTEC evela esithombeni esikhulu.

Isebenza kanjani injini ye-DOHC?

Igama lalolu hlobo lwenjini lihunyushwe ngesiSpanishi (I-camshaft engaphezulu ephindwe kabili) kakade isitshela okuningi mayelana nokuma nokwakheka kwayo. Iyinjini evuthayo yangaphakathi futhi isebenzisa, njengoba negama layo liphakamisa, ama-camshaft amabili atholakala ekhanda lesilinda evula ngalo ama-valve wokukhipha kanye nokungenisa injini. Ngenxa yalesi sizathu, kukuvumela ukuthi ulawule ukungena nokukhipha ngokuhlukile ezintweni ezifana nokuvula nokuvala ama-valve noma isikhathi lapho avuliwe.

Uma ubheka izinjini kulesi sihloko, uzobona ukuthi banazo amasondo amabili egiya phezulu. Indlela enhle yokubona injini ye-DOHC ngokubuka nje. Ngenxa yabo, womabili ama-camshaft anyakaziswa ukusatshalaliswa futhi asale kuhlanganiswe ne-crankshaft.

Izinzuzo ze-DOHC

Ukufika kwezinjini ze-DOHC kwaba kusengaphambili futhi, ngakho-ke, isamba seziningana izinzuzo. Nazi ezinye zazo:

• Izingxenye ezimbalwa phakathi kwamakhamera namavalvu, ngaleyo ndlela zithola ukunemba okukhulu ekuvuleni nasekuvaleni kwazo. I ompompi Yibo abathola ingcindezi yamakhamera.
• Ezinjinini zikaphethiloli, zivumela ukuthi i-spark plug ibekwe phakathi nendawo yegumbi, ngaleyo ndlela kuncishiswe ukwenzeka kokuziqhumisa, edume kakhulu ngokuthi "chopped". Le nzuzo iphinde idluliselwe ezinjini ze-diesel, lapho zivumela khona ukuthi zikhiqize ukusebenza kahle okukhulu komlilo. Okuthile okuye kwagxila kakhulu ngokujwayelekile kwe- umjovo oqondile.
• Ngokukwazi ukuphatha ama-valve okungenisa kanye nokukhipha ngokuhlukana, kubangela uketshezi olukhulu ekamelweni elivuthayo, elihumusheka ngokuthi. amandla aphakeme.

I-athikili ehlobene:

amasistimu womjovo

Izinkinga ze-DOHC

Kodwa akuyona yonke into eyayizoba izinzuzo, kodwa lezi zinjini nazo zinomlingani othile:

• Inesisindo esikhulu nevolumu kunenjini ye-SOHC, ngakho umhlangano wayo uyinkimbinkimbi kakhulu.
• Ibonisa ubunzima bokulungisa ukucaciswa kwama-valve.
• Njengoba kuyinjini ye-OHC, idinga uhlelo oluthile ukuze idlulise ukunyakaza kusuka ku-crankshaft (ngezansi) kuya ku-shafts (ngenhla). Ngokujwayelekile a Ibhande lesikhathi lokho kudinga ukunakekelwa nokushintshwa njalo ngenani elithile lamakhilomitha. Amanye amamodeli ane uchungechunge lokusabalalisa okudinga ukulungiswa okuncane futhi, ukuvimbela amaphutha noma ukuwohloka, ngokuvamile kugcina impilo yenjini. Isithombe senjini ye-Honda (ngenhla kwalesi sigaba) siyisibonelo esihle salokhu.

I-athikili ehlobene:

Izinhlobo zokusabalalisa ezinjinini zamanje kanye nokusebenza kwazo

Umlando we-DOHC

Kwavela ku 1920s, nakuba ukusetshenziswa kwayo kwakuvunyelwe kusukela ngonyaka ka-1980. Ekuqaleni, lezi zinjini zazihlanganiswe kuphela imikhiqizo emikhulu efana neFerrari, Jaguar, njll., nakuba kancane kancane yanwetshwa kwamanye amafemu.

Kwavela okuphambene ne Izinjini ze-SOHC, I-Single Overhead Camshaft. Umehluko phakathi kwalezi zinjini ezimbili akukhona ukuthi i-DOHC Basebenzisa i-camshaft eyodwa kuma-valve okudonsa kanye neyodwa yamavalvu okukhipha umoya.. Ngenkathi izinjini ze-SOHC sebenzisa i-camshaft eyodwa, ukusebenzisa kokubili ama-valve okungenisa nawokukhipha. Kungakho badinga izingxenye ezengeziwe njengezingalo ze-rocker ukuxhuma amakhamera namavalvu.

Isithombe 5 - WillVision

Ulwazi olwengeziwe mayelana nale modeli

2017 Honda Civic

• Amaplaza 5
• Potencia 126 - 320 hp
• Ukusetshenziswa 5,7 - 8,5l/100km
• Ukuhlola 4,4