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【正文】 TD height=148 align=middle vAlign=up TABLE cellSpacing=1 cellPadding=0 width=533 align=center border=0TBODY TR TD width=120 height=138 align=middle vAlign=centerimg src=../image/u=388028740,2190678585amp。gp= width=140 height=109/TD TD vAlign=top width=400 TABLE width=100% height=122 border=0 cellPadding=0 cellSpacing=0 TBODY TR TD height=36 align=middle TABLE height=23 cellSpacing=3 cellPadding=0 width=98% border=0 TBODY TR TD width=93% height=17 align=center class=chong汽車構(gòu)造(上冊(cè))/TD /TR/TBODY/TABLE/TD/TR TR class=lllllllllllllllllllllll TD height=69 align=center valign=middle class=zhang STYLE3p class=zhang第一章 汽車發(fā)動(dòng)機(jī)的工作原理及總體構(gòu)造amp。nbsp。/p p class=jie節(jié) :a href=1/a a href=2/a a href=3/a a href=4/a a href=5/a     /p /TD /TR TR class=lllllllllllllllllllllll TD height=17 align=center bgcolor=FFFFFF class=zhengwen STYLE3amp。nbsp。/TD /TR /TBODY/TABLE/TD/TR/TBODY/TABLE/TD/TR TR TD height=18 bgcolor=ECDCF5amp。nbsp。/TD /TR TR TD height=237 align=left vAlign=up TABLE height=185 cellSpacing=0 cellPadding=0 width=572 align=center border=0 TBODY TR TD width=572 height=27 align=right vAlign=upp class=jjjjjjjjjjjjjjjjjjjjjjspan class=mmmmmmmmmmmmmmmmmmmmmmmmmmm a href=返回節(jié)目錄/a amp。gt。 a href=上一頁(yè)/a | a href=下一頁(yè)/a /span/p /TD /TR TR TD height=120 align=left vAlign=upDIV align=center DIV align=left p align=center class=jie第四節(jié) 發(fā)動(dòng)機(jī)的總體構(gòu)造/p p span class=zhengwen發(fā)動(dòng)機(jī)是一種由許多機(jī)構(gòu)和系統(tǒng)組成的復(fù)雜機(jī)器。無(wú)論是汽油機(jī),還是柴油機(jī);無(wú)論是四行程發(fā)動(dòng)機(jī),還是二行程發(fā)動(dòng)機(jī);無(wú)論是單缸發(fā)動(dòng)機(jī),還是多缸發(fā)動(dòng)機(jī),要完成能量轉(zhuǎn)換,實(shí)現(xiàn)工作循環(huán),保證長(zhǎng)時(shí)間連續(xù)正常工作,都必須具備以下一些機(jī)構(gòu)和系統(tǒng)。/span/p p img src=image/ width=515 height=557/p p class=zhengwen 汽油機(jī)由以下兩大機(jī)構(gòu)和五大系統(tǒng)組成,即由曲柄連桿機(jī)構(gòu),配氣機(jī)構(gòu)、燃料供給系、潤(rùn)滑系、冷卻系、點(diǎn)火系和起動(dòng)系組成;柴油機(jī)由以上兩大機(jī)構(gòu)和四大系統(tǒng)組成,即由曲柄連桿機(jī)構(gòu)、配氣機(jī)構(gòu)、燃料供給系、潤(rùn)滑系、冷卻系和起動(dòng)系組成,柴油機(jī)是壓燃的,不需要點(diǎn)火系。/p p align=center class=zhengwena href=../../spjj/ target=_blankimg src=../image/ width=342 height=35 border=0/a/p /DIV /DIV p class=zhengwen/p p class=zhengwen曲柄連桿機(jī)構(gòu)是發(fā)動(dòng)機(jī)實(shí)現(xiàn)工作循環(huán),完成能量轉(zhuǎn)換的主要運(yùn)動(dòng)零件。它由機(jī)體組、活塞連桿組和曲軸飛輪組等組成。/p p align=center class=zhengwenimg src=image/ width=499 height=430/p p class=zhengwen/p p class=zhengwen 配氣機(jī)構(gòu)的功用是根據(jù)發(fā)動(dòng)機(jī)的工作順序和工作過程,定時(shí)開啟和關(guān)閉進(jìn)氣門和排氣門,使可燃混合氣或空氣進(jìn)入氣缸,并使廢氣從氣缸內(nèi)排出,實(shí)現(xiàn)換氣過程。(如下圖)/p img src=image/ width=589 height=438span class=zhengwen/span p class=zhengwen 冷卻系的功用是將受熱零件吸收的部分熱量及時(shí)散發(fā)出去,保證發(fā)動(dòng)機(jī)在最適宜的溫度狀態(tài)下工作。水冷發(fā)動(dòng)機(jī)的冷卻系通常由冷卻水套、水泵、風(fēng)扇、水箱、節(jié)溫器等組成。(如下圖)/p p class=zhengwen    object classid=clsid:D27CDB6EAE6D11cf96B8444553540000 codebase=,0,19,0 width=500 height=400 param name=movie value=image/ param name=quality value=high embed src=image/ quality=high pluginspage= type=application/xshockwaveflash width=500 height=400/embed /object /p/TD /TR TR TD height=38 align=right vAlign=upspan class=jjjjjjjjjjjjjjjjjjjjjjspan class=mmmmmmmmmmmmmmmmmmmmmmmmmmm a href=返回節(jié)目錄/a amp。gt。 a href=上一頁(yè)/a | a href=下一頁(yè)/a /span/span/TD /TR /TBODY/TABLE/TD/TR/TBODY/TABLE/TD TD width=1 align=left vAlign=top bgColor=ffffff/TD /TR/TBODY/TABLEtable height=56 cellspacing=0 cellpadding=0 width=755 align=center border=0 tbody tr td height=56 align=middle valign=top bgcolor=fffffftable cellspacing=0 cellpadding=0 width=100% align=center border=0 tbody tr tdtable height=56 cellspacing=0 cellpadding=0 width=755 align=center border=0 tbody tr td height=56 align=middle valign=uptable class=style cellspacing=0 cellpadding=0 align=center border=0 tbody tr valign=top tdtable cellspacing=0 cellpadding=0 width=100% align=center border=0 tbody tr tdtable class=style cellspacing=0 cellpadding=0 align=center border=0 tbody tr td height=2 align=left valign=upimg height=2 src=../image/ width=755 border=0/td /tr /tbody /table/td /tr tr tdtable class=style height=45 cellspacing=0 cellpadding=0 width=755 align=center bgcolor=efe4f6 border=0 tbody tr
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