CAMOZZI 61M2P125A0320氣缸

排量較大、功率較大的發(fā)動(dòng)機(jī)要采用多氣門技術(shù)。簡(jiǎn)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(gè)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(gè)汽缸各有兩個(gè)進(jìn)氣門和兩個(gè)排氣門。

四氣門結(jié)構(gòu)能大幅度提高發(fā)動(dòng)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(huì)導(dǎo)致發(fā)動(dòng)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(dòng)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(dòng)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(dòng)力性*的原因。奔馳公司長(zhǎng)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(yùn)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(yùn)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(yùn)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(shí)效處理，就是要存放一些時(shí)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(shí)效時(shí)間短，那么加工好的汽缸在以后的運(yùn)行中還會(huì)變形，這就是為什么有的汽缸在次泄漏處理后還會(huì)在以后的運(yùn)行中還有漏汽發(fā)生。因?yàn)槠走€在不斷的變形。