排(pai)氣(qi)歧(qi)管,是(shi)與發(fa)動(dong)機氣(qi)缸(gang)(gang)體(ti)相連的(de)(de),將各缸(gang)(gang)的(de)(de)排(pai)氣(qi)集(ji)中起來(lai)導(dao)入排(pai)氣(qi)總(zong)管,帶有(you)分歧(qi)的(de)(de)管路。對它的(de)(de)要求主要是(shi),盡量(liang)減少排(pai)氣(qi)阻(zu)力,并避免(mian)各缸(gang)(gang)之間相互干擾。
排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan)的(de)(de)(de)作用:排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan)是(shi)連接每(mei)個(ge)氣(qi)(qi)(qi)(qi)缸(gang)的(de)(de)(de),最后排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan)會(hui)匯(hui)集(ji)成一根(gen)(gen)管(guan)(guan)(guan)子(zi)(zi),排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan)可以讓汽缸(gang)內排出的(de)(de)(de)廢氣(qi)(qi)(qi)(qi)進(jin)入(ru)排氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)。汽車都是(shi)有(you)(you)排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan)的(de)(de)(de),如果(guo)發動(dong)機(ji)有(you)(you)四個(ge)氣(qi)(qi)(qi)(qi)缸(gang),就(jiu)(jiu)有(you)(you)四根(gen)(gen)排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan),如果(guo)發動(dong)機(ji)有(you)(you)八個(ge)氣(qi)(qi)(qi)(qi)缸(gang),就(jiu)(jiu)有(you)(you)八個(ge)排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan)。排氣(qi)(qi)(qi)(qi)歧(qi)(qi)(qi)管(guan)(guan)(guan)也(ye)被稱(cheng)為排氣(qi)(qi)(qi)(qi)頭(tou)段(duan),發動(dong)機(ji)的(de)(de)(de)排氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)是(shi)由(you)三段(duan)組成的(de)(de)(de),分(fen)別是(shi)頭(tou)段(duan),中(zhong)(zhong)(zhong)段(duan),尾(wei)段(duan)。中(zhong)(zhong)(zhong)段(duan)是(shi)在(zai)底盤上的(de)(de)(de),中(zhong)(zhong)(zhong)段(duan)是(shi)一根(gen)(gen)比較長的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)。尾(wei)段(duan)是(shi)靠近后保險(xian)杠(gang)的(de)(de)(de)部分(fen),尾(wei)段(duan)上一般有(you)(you)一個(ge)比較大(da)的(de)(de)(de)消音(yin)器。排氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)可以讓發動(dong)機(ji)做(zuo)功產生的(de)(de)(de)廢氣(qi)(qi)(qi)(qi)排到大(da)氣(qi)(qi)(qi)(qi)中(zhong)(zhong)(zhong),并且可以降低(di)排氣(qi)(qi)(qi)(qi)過程中(zhong)(zhong)(zhong)產生的(de)(de)(de)噪音(yin)。
savana是gmc品牌中(zhong)的商用車系(xi)列。gmc除了savana(商務之星)外,還有有使節(envoy)、峽谷(canyon)、西拉(sierra)育空河(yukon)、旅行(safari)等一系列車型。
savana自從1965年首次面世以來只經歷過一次徹底的重新設計。雖然不間斷的改進貫穿了70、80 和90年代使其保持最新狀態,但是直到1995年的徹底重新設計和改裝才使得gmc貨車成為一款正統的現代機動車。
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