【正文】 variation is possible as regards the transmission ratio, ranging as far as a reversal of the direction of rotation. The parallel meshing of several gears under load permits a pact construction.
行星齒輪系主要應(yīng)用在主減速器、后置副變速器和自動(dòng)變速器上。最簡(jiǎn)單的行星齒輪系統(tǒng)由太陽(yáng)輪、齒圈和行星輪組成。三部件中任意一個(gè)都可作輸、輸出或保持靜止。這樣，依照變速比的不同可得到較大的變速范圍，汽車(chē)的倒行也能實(shí)。承載齒輪的平行嚙合使行星輪系結(jié)構(gòu)較緊湊。
4）When a vehicle is cornered the inner wheel moves through a shorter distance than the outer wheel. This means that the inner wheel must slow down and the outer wheel must speed up. During this period it is desirable that each driving wheel maintains its driving action. The differential performs these two tasks.
當(dāng)汽車(chē)轉(zhuǎn)彎時(shí)，內(nèi)側(cè)車(chē)輪比外側(cè)車(chē)輪行駛的距離要短 ，這說(shuō)明內(nèi)側(cè)車(chē)輪比外側(cè)車(chē)輪轉(zhuǎn)得要慢。在此期間，維持每個(gè)驅(qū)動(dòng)車(chē)輪的行駛狀態(tài)是很重要的。這兩個(gè)任務(wù)由差速器來(lái)完成。
另：重點(diǎn)詞句重點(diǎn)詞語(yǔ) Train: 傳動(dòng)系統(tǒng) : 懸架 : 氣缸 : 變速器 : 汽油機(jī) Drive: 主減速器，后橋 Spring: 鋼板彈簧 : 活塞 : 上止點(diǎn) : 潤(rùn)滑 : 消聲器 Gear: 行星齒輪 Brake: 盤(pán)式制動(dòng)器 System: 通風(fēng)系統(tǒng) : 混合動(dòng)力重點(diǎn)句子一1 Gasoline and Diesel are called heat engines, the burning fuel generates heat which causes the gas inside the cylinder to increase its pressure and supply power to rotate a shaft connected to the power ，車(chē)用燃料產(chǎn)生熱量使得氣缸里的氣體壓力升高，為傳動(dòng)系統(tǒng)的曲軸提供動(dòng)力。2 An automatic transmission performs similar functions to a manual transmission except that gear selection is controlled either htdraulically or ，其余方面，自動(dòng)變速器和手動(dòng)變速器的功能類似。3 The purpose of the plete suspension system is to isolate the vehicle body from road shocks and vibrations, which will otherwise be transferred to the passengers and 、緩減路面沖擊和振動(dòng),避免傳遞到車(chē)身,影響乘客和貨物的舒適性和安全性。4 All vehicles must fitted with at least 2 independent brake systems. They were once called the service brake and the emergency ，即行車(chē)制動(dòng)和緊急制動(dòng)。5 The pressure developed within the bustion chamber is applied to the head of a piston to produce a usable mechanical 。6 The valve system is made up of those parts needed to open and close the valves at just the right time. 氣門(mén)系統(tǒng)由那些在正確時(shí)間開(kāi)啟和關(guān)閉氣門(mén)的零部件組成。7 The burned gases removed from the bustion chamber contain such harmful emissions as hydrocarbons,carbon monoxide and nitrous ：HC、CO和NOx8 The location of the driving axle determines whether the vehicle is classified as rearwheel drive,frontwheel drive,fourwheel drive or allwheel ：后驅(qū)、前驅(qū)、四輪驅(qū)動(dòng)和全輪驅(qū)動(dòng)。9 In mercial vehicles, the necessary finaldrive ration can only rarely be acmodated in one stage. For this reason, use is usually made of more elaborate finaldrive ，很少采用單級(jí)的主減速裝置?；诖?，商用車(chē)通常采用復(fù)雜的多級(jí)主減速傳動(dòng)裝置。10 There are two main ways of building automobiles. They are built using body/frame construction and unitized body ：承載式和車(chē)身和非承載式車(chē)身。重點(diǎn)句子二1. In a work cycle of the engine ,each piston goes through fourstroke processes:intake stroke ,pression stroke ,power stroke and exhaust ，壓縮沖程，作功沖程和排氣沖程 mechanism includes valve group and valve driving valve group includes valve,valve seat ,valve guide and valve valve driving group includes camshaft,lifter,push rod,rocker arm,timing gear and so ，氣門(mén)組包括氣門(mén)，氣門(mén)座，氣門(mén)導(dǎo)管和氣門(mén)彈簧。氣門(mén)傳動(dòng)組包括凸輪軸，挺桿，推桿，搖臂，正時(shí)齒輪等 basic ignition system consists of the battery,lowtension coil and cables,the ignition coil,the distributor,hightension coil and cables,spark plug cables and spark 、低壓線圈電纜、點(diǎn)火線圈、分電器、高壓線圈電纜、火花塞電纜和火花塞。 purpose of the ignition switch is to connect and disconnect the ignition system with the battery, so the engine can be started and stopped as ，從而使發(fā)動(dòng)機(jī)能夠按照人的意愿起動(dòng)或停止。 oneway clutch is a device that will allow a ponent such as a ring gear to turn freely in one direction but not in the （如齒圈）朝一個(gè)方向轉(zhuǎn)動(dòng)，另外一個(gè)方向不能轉(zhuǎn)動(dòng)。 mechanism consists of three parts : engine block group ,piston and connecting rod group ,crankshaft and flywheel group .曲柄連桿機(jī)構(gòu)由發(fā)動(dòng)機(jī)機(jī)體組、活塞連桿組和曲軸飛輪組三部分組成。11