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排氣歧管(guan)，是與發動機氣缸體相(xiang)連的，將(jiang)各缸的排氣集中起來導入排氣總管(guan)，帶有分歧的管(guan)路(lu)。對它的要求主要是，盡量減(jian)少排氣阻力，并避免各缸之間相(xiang)互(hu)干擾。
排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)作用：排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)是(shi)(shi)(shi)(shi)連(lian)接每個(ge)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)缸的(de)(de)(de)，最后(hou)排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)會匯集(ji)成一根管(guan)(guan)(guan)(guan)(guan)子(zi)，排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)可以(yi)讓(rang)汽(qi)缸內排(pai)(pai)(pai)(pai)出的(de)(de)(de)廢氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)進入排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)。汽(qi)車(che)都(dou)是(shi)(shi)(shi)(shi)有(you)排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)，如(ru)果發(fa)動機(ji)有(you)四個(ge)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)缸，就(jiu)有(you)四根排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)，如(ru)果發(fa)動機(ji)有(you)八個(ge)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)缸，就(jiu)有(you)八個(ge)排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)。排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)歧(qi)(qi)管(guan)(guan)(guan)(guan)(guan)也被稱(cheng)為排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)頭段(duan)(duan)，發(fa)動機(ji)的(de)(de)(de)排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)是(shi)(shi)(shi)(shi)由三(san)段(duan)(duan)組成的(de)(de)(de)，分(fen)別是(shi)(shi)(shi)(shi)頭段(duan)(duan)，中段(duan)(duan)，尾段(duan)(duan)。中段(duan)(duan)是(shi)(shi)(shi)(shi)在底盤上的(de)(de)(de)，中段(duan)(duan)是(shi)(shi)(shi)(shi)一根比(bi)較(jiao)長的(de)(de)(de)管(guan)(guan)(guan)(guan)(guan)子(zi)。尾段(duan)(duan)是(shi)(shi)(shi)(shi)靠(kao)近后(hou)保險杠的(de)(de)(de)部分(fen)，尾段(duan)(duan)上一般有(you)一個(ge)比(bi)較(jiao)大的(de)(de)(de)消音器(qi)。排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)可以(yi)讓(rang)發(fa)動機(ji)做(zuo)功產(chan)生(sheng)的(de)(de)(de)廢氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)排(pai)(pai)(pai)(pai)到(dao)大氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)中，并且(qie)可以(yi)降低排(pai)(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)(qi)(qi)(qi)過程(cheng)中產(chan)生(sheng)的(de)(de)(de)噪音。
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