CAMOZZI 61M2P125A0320氣缸

排量較大、功率較大的發(fā)動機(jī)要采用多氣門技術(shù)。簡單的多氣門技術(shù)是三氣門結(jié)構(gòu)，即在一進(jìn)一排的二氣門結(jié)構(gòu)基礎(chǔ)上再加上一個進(jìn)氣門。世界各大汽車公司新開發(fā)的轎車大多采用四氣門結(jié)構(gòu)。四氣門配氣機(jī)構(gòu)中，每個汽缸各有兩個進(jìn)氣門和兩個排氣門。

四氣門結(jié)構(gòu)能大幅度提高發(fā)動機(jī)的吸氣、排氣效率，新款轎車大都采用四氣門技術(shù)。不過，達(dá)到或超過六氣門不僅使配氣結(jié)構(gòu)過于復(fù)雜，還會導(dǎo)致發(fā)動機(jī)壽命縮短，氣門開啟的空間簾區(qū)（氣門的圓周和氣門的升程）也較小，效率下降。因此，四氣門技術(shù)目前使用為普遍。

需要指出的是，汽缸和氣門數(shù)可以作為判斷發(fā)動機(jī)優(yōu)劣的標(biāo)準(zhǔn)之一，但不是標(biāo)準(zhǔn)。比如，寶馬公司的直列4缸2.0升發(fā)動機(jī)，由于其*的可變氣門技術(shù)，在功率和扭矩輸出上絲毫不遜于普通的6缸機(jī)，這也是寶馬318轎車動力性*的原因。奔馳公司長期采用每缸3氣門技術(shù)，也達(dá)到了很好的功率、扭矩和環(huán)保水平。此外，配備渦輪增壓技術(shù)后，寶來1.8T4缸機(jī)的功率和扭矩也能達(dá)到普通6缸機(jī)的水平。CAMOZZI汽缸是鑄造而成的 03A4885-E00202 氣缸
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CAMOZZI 61M2P125A0320氣缸

在汽缸運行過程中，汽缸滲漏和汽缸變形是為常見的設(shè)備問題，汽缸結(jié)合面的嚴(yán)密性直接影響機(jī)組的安全經(jīng)濟(jì)運行，檢修研刮汽缸的結(jié)合面，使其達(dá)到嚴(yán)密，是汽缸檢修的重要工作，在處理結(jié)合面漏汽的過程中，要仔細(xì)分析形成的原因，根據(jù)變形的程度和間隙的大小，可以綜合的運用各種方法，以達(dá)到結(jié)合面嚴(yán)密的要求。原因如下：

1、汽缸是鑄造而成的，汽缸出廠后都要經(jīng)過時效處理，就是要存放一些時間，使汽缸在住鑄造過程中所產(chǎn)生的內(nèi)應(yīng)力*消除。如果時效時間短，那么加工好的汽缸在以后的運行中還會變形，這就是為什么有的汽缸在次泄漏處理后還會在以后的運行中還有漏汽發(fā)生。因為汽缸還在不斷的變形。