進氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)閥(fa)座(zuo)(zuo)環功能氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)的(de)主(zhu)要作(zuo)用(yong)(yong)是(shi)(shi)(shi)承(cheng)(cheng)受(shou)高速沖擊(ji),密(mi)封(feng)氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)。發(fa)動(dong)機(ji)(ji)氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)用(yong)(yong)于延(yan)長發(fa)動(dong)機(ji)(ji)的(de)使(shi)用(yong)(yong)壽命(ming),便(bian)(bian)于維(wei)護和(he)更(geng)(geng)換。氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)的(de)缺點是(shi)(shi)(shi)導熱性(xing)差(cha),選(xuan)擇(ze)合(he)適的(de)與缸膛過盈(ying)量,否則工作(zuo)時(shi)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)會脫落,造成(cheng)發(fa)動(dong)機(ji)(ji)維(wei)修(xiu)(xiu)事故!氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)一(yi)般(ban)由(you)耐熱合(he)金鋼制成(cheng)。汽車氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)是(shi)(shi)(shi)汽車發(fa)動(dong)機(ji)(ji)的(de)重要附(fu)件,主(zhu)要用(yong)(yong)來密(mi)封(feng)發(fa)動(dong)機(ji)(ji)氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men),基本(ben)上是(shi)(shi)(shi)一(yi)個時(shi)刻承(cheng)(cheng)受(shou)高速沖擊(ji)的(de)部件。因此,汽車氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)在使(shi)用(yong)(yong)一(yi)段時(shi)間后,容易出現不同(tong)程度的(de)磨(mo)損失(shi)效,經常面(mian)臨維(wei)修(xiu)(xiu)。修(xiu)(xiu)理氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)時(shi),應根據氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)的(de)不同(tong)磨(mo)損情(qing)況選(xuan)擇(ze)不同(tong)的(de)修(xiu)(xiu)理方法(fa),以(yi)降低發(fa)動(dong)機(ji)(ji)的(de)維(wei)修(xiu)(xiu)成(cheng)本(ben)。一(yi)般(ban)來說,氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)座(zuo)(zuo)圈(quan)(quan)(quan)(quan)(quan)的(de)作(zuo)用(yong)(yong)是(shi)(shi)(shi)提(ti)高發(fa)動(dong)機(ji)(ji)的(de)使(shi)用(yong)(yong)壽命(ming),承(cheng)(cheng)受(shou)高速沖擊(ji),方便(bian)(bian)發(fa)動(dong)機(ji)(ji)維(wei)修(xiu)(xiu)和(he)更(geng)(geng)換,密(mi)封(feng)發(fa)動(dong)機(ji)(ji)氣(qi)(qi)(qi)(qi)(qi)門(men)(men)(men)(men)。
1、氣門(Valve)的作用是專門負責向發動機內輸入燃料并排出廢氣,傳統發動機每個汽缸只有一個進氣門和一個排氣門,這種設計結構相對簡單,成本較低,維修方便,低速性能較好,缺點是功率很難提高,尤其是高轉速時充氣效率低、性能較弱。
2、為了提高進排氣效率,現在多采用多氣門技術,常見的是每個汽缸布置有4個氣門(也有單缸3或5個氣門的設計,原理一樣,如奧迪A6的發動機),4汽缸一共就是16個氣門,我們在汽車資料上經常看到的“16V”就表示發動機共16個氣門。這種多氣門結構容易形成緊湊型燃燒室,噴油器布置在中央,這樣可以令油氣混合氣燃燒更迅速、更均勻,各氣門的重量和開度適當地減小,使氣門開啟或閉合的速度更快。
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