Nthawi ya valve yosinthika. Kodi ubwino wake ndi wotani? Zopuma zotani?
Kuyika ma valve nthawi zonse pa liwiro la injini ndi njira yotsika mtengo koma yosagwira ntchito. Kusintha kwa gawo kuli ndi zabwino zambiri.
Pofufuza mipata yowonjezera pisitoni, injini zoyaka mkati mwa sitiroko zinayi, opanga nthawi zonse akubweretsa njira zatsopano zosinthira mphamvu, kukulitsa liwiro lothandizira, kuchepetsa kugwiritsa ntchito mafuta komanso kuchepetsa kutulutsa mpweya. Polimbana ndi kukhathamiritsa njira zoyatsira mafuta, mainjiniya nthawi ina amagwiritsa ntchito ma valve osinthasintha kuti apange injini zogwira mtima komanso zosunga chilengedwe. Kuwongolera nthawi, komwe kunathandizira kwambiri njira yodzaza ndi kuyeretsa malo pamwamba pa ma pistoni, kunatsimikizira kukhala othandizana nawo opanga mapangidwe ndipo kunatsegula mwayi kwa iwo.
M'mayankho apamwamba osasintha nthawi ya ma valve, mavavu a injini ya sitiroko zinayi amatseguka ndikutseka molingana ndi kuzungulira kwina. Kuzungulira uku kumabwerezedwanso chimodzimodzi malinga ngati injini ikuyenda. Pa liwiro lonselo, palibe malo a camshaft (s), kapena malo, mawonekedwe ndi chiwerengero cha makamera pa camshaft, kapena malo ndi mawonekedwe a rocker arms (ngati aikidwa) kusintha. Zotsatira zake, nthawi yabwino yotsegulira ndi kuyenda kwa valve kumangowoneka pamtunda wopapatiza kwambiri. Kuphatikiza apo, sizigwirizana ndi zomwe zili mulingo woyenera ndipo injini ikuyenda bwino. Choncho, nthawi ya valve yopangidwa ndi fakitale ndizovuta kwambiri pamene injini ikugwira ntchito bwino koma sangathe kusonyeza mphamvu zake zenizeni za mphamvu, kusinthasintha, kugwiritsa ntchito mafuta ndi mpweya wotulutsa mpweya.
Ngati zinthu zilowetsedwa mu dongosolo lokhazikika, logwirizana lomwe limalola kusintha magawo a nthawi, ndiye kuti zinthu zidzasintha kwambiri. Kuchepetsa nthawi ya valve ndi kukweza kwa valve mumayendedwe otsika ndi apakatikati, kukulitsa nthawi ya valve ndikukweza kukweza kwa valve mu liwiro lalikulu, komanso "kufupikitsa" mobwerezabwereza nthawi ya valve pa liwiro loyandikira kwambiri, kungathe kukulitsa kwambiri liwiro lomwe magawo a nthawi ya valve ali abwino. M'malo mwake, izi zikutanthauza ma torque ocheperako (kusinthasintha kwa injini, kuthamangitsa kosavuta popanda kutsika), komanso kukwaniritsa makokedwe ake pamitundu yambiri. Choncho, m'mbuyomu, mu specifications luso, makokedwe pazipita kugwirizana ndi liwiro la injini, ndipo tsopano nthawi zambiri amapezeka mu osiyanasiyana liwiro.
Kusintha kwa nthawi kumachitika m'njira zosiyanasiyana. Kupita patsogolo kwa dongosolo kumatsimikiziridwa ndi mapangidwe a variator, i.e. executive element yomwe ili ndi udindo wosintha magawo. M'mayankho ovuta kwambiri, ndi dongosolo lonse lomwe limayendetsedwa ndi makompyuta, poganizira zinthu zambiri zosiyana. Zonse zimatengera ngati muyenera kusintha nthawi yotsegulira ma valve kapena sitiroko. Ndikofunikiranso ngati zosinthazo zichitika mwadzidzidzi kapena pang'onopang'ono.
Mu dongosolo losavuta (VVT), chosinthira, i.e. chinthu chomwe chimapanga kusamuka kwa angular kwa camshaft chimayikidwa pa pulley ya camshaft drive. Mothandizidwa ndi kukakamiza kwamafuta komanso chifukwa cha zipinda zopangidwa mwapadera mkati mwa gudumu, makinawo amatha kuzungulira kachipangizo kamene kamakhala ndi camshaft yomwe imayikidwa momwemo molingana ndi nyumba yamagudumu, yomwe imayendetsedwa ndi chinthu choyendetsa nthawi (unyolo kapena lamba wa mano). Chifukwa cha kuphweka kwake, dongosolo loterolo ndi lotsika mtengo, koma losathandiza. Amagwiritsidwa ntchito ndi, mwa ena, Fiat, PSA, Ford, Renault ndi Toyota mumitundu ina. Dongosolo la Honda's (VTEC) limapereka zotsatira zabwino kwambiri. Kufikira pa rpm inayake, ma valve amatsegulidwa ndi makamera okhala ndi mbiri zomwe zimalimbikitsa kuyendetsa bwino komanso kopanda ndalama. Liwiro lina likadutsa, ma cams amasinthasintha ndipo ma levers amakanikiza makamera, zomwe zimapangitsa kuyendetsa bwino kwamasewera. Kusintha kumachitika ndi hydraulic system, chizindikirocho chimaperekedwa ndi wolamulira wamagetsi. Ma hydraulics amakhalanso ndi udindo woonetsetsa kuti ma valve awiri okha pa silinda akugwira ntchito mu gawo loyamba, ndi ma valve onse anayi pa silinda mu gawo lachiwiri. Pankhaniyi, osati nthawi zotsegulira za mavavu amasintha, komanso sitiroko yawo. Yankho lofananalo kuchokera ku Honda, koma ndi kusintha kosalala kwa nthawi ya valve kumatchedwa i-VTEC. Mayankho ouziridwa ndi Honda atha kupezeka ku Mitsubishi (MIVEC) ndi Nissan (VVL).
Zabwino kudziwa: zotsatsa zabodza. Pali scammers pa intaneti! Chitsime: TVN Turbo / x-news
