進氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈閥座(zuo)環功能氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈的(de)(de)(de)主(zhu)要(yao)作(zuo)用(yong)(yong)是承(cheng)受高(gao)速沖擊,密(mi)封(feng)(feng)氣(qi)(qi)門(men)(men)(men)(men)(men)。發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈用(yong)(yong)于(yu)延長(chang)發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)的(de)(de)(de)使用(yong)(yong)壽命,便于(yu)維(wei)護(hu)和更換。氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈的(de)(de)(de)缺點是導(dao)熱性差,選擇合(he)適的(de)(de)(de)與(yu)缸(gang)膛過盈量,否則工作(zuo)時(shi)(shi)座(zuo)圈會脫落,造成發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)維(wei)修事故!氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈一般(ban)(ban)由(you)耐熱合(he)金鋼(gang)制成。汽(qi)車氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈是汽(qi)車發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)的(de)(de)(de)重要(yao)附件(jian),主(zhu)要(yao)用(yong)(yong)來(lai)密(mi)封(feng)(feng)發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)氣(qi)(qi)門(men)(men)(men)(men)(men),基本(ben)(ben)上(shang)是一個時(shi)(shi)刻承(cheng)受高(gao)速沖擊的(de)(de)(de)部件(jian)。因此,汽(qi)車氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈在使用(yong)(yong)一段時(shi)(shi)間后,容易出現不同(tong)程(cheng)度的(de)(de)(de)磨(mo)損失效,經常面臨維(wei)修。修理(li)(li)氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)時(shi)(shi),應根據(ju)氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)的(de)(de)(de)不同(tong)磨(mo)損情況選擇不同(tong)的(de)(de)(de)修理(li)(li)方法(fa),以降(jiang)低發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)的(de)(de)(de)維(wei)修成本(ben)(ben)。一般(ban)(ban)來(lai)說,氣(qi)(qi)門(men)(men)(men)(men)(men)座(zuo)圈的(de)(de)(de)作(zuo)用(yong)(yong)是提(ti)高(gao)發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)的(de)(de)(de)使用(yong)(yong)壽命,承(cheng)受高(gao)速沖擊,方便發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)維(wei)修和更換,密(mi)封(feng)(feng)發動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)氣(qi)(qi)門(men)(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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