【正文】 JH125 起動(dòng)棘輪 JH125 起動(dòng)軸 JH125 棘輪彈簧 JH125 回位彈簧 JH125 雙聯(lián)齒輪 JH125 轉(zhuǎn)子部件 JH125 定子部件 JH125 二次進(jìn)氣管 JH125 左前蓋 JH125 左后蓋 JH125 左上蓋 JH125 磁電機(jī)螺栓 JH125 油封14*22*5 根據(jù)上述零部件的價(jià)格，再考慮到裝配工人工資、。外文資料：JH125 Motorcycle Engine An understanding of the operation or purpose of the various parts is necessary for a plete understanding of the whole engine .Each part or unit has its own special function to perform and in conjunction with other parts makes up a petrol engine . A person who wants to operate , repair ,or otherwise service petrol engines must be able to recognize the different parts b sight and know what their particular functions are . Engine’s the main working parts are , the cylinder .the cylinder heard .usually holding inlet and exhaust valves .the piston .the connecting rod .the crankshaft .the crankshaft or main and connectingrod bearings .Cylinder : The heart of the engine is the cylinder ,where the fuel is burned and the power is developed ,The inside lf the cylinder is formed by the liner ,or sleeve .The inside diameter of the cylinder is called the bore .valves through which air and fuel are admitted and the exhaust gass discharged . Piston The other end of the working space of the cylinder is closed by the piston that transnits to the crankshaft the power developed by the burning of the fuel . Piston rings lubricated with engine oil produce a gastight seal between the piston and the cylinder liner . The distance that the piston travels from one end of the cylinder to the other is called the stroke . Connecting Rod ,One end ,called the small end of the connecting rod ,is attached to the wrist pin or piston pin located in the piston . The other or bin end has a bearing for the crankpin .The connecting rod changes and transmits the reciprocating motion of the piston to the continuously rotaing crankpin during the working stroke and vice versa during the other strokes . Crankshaft . The crankshaft turns the action of the piston through the connecting rod and crankpin located between crank webs ,or cheeks , and transmits the work from the piston to the drive shaft . The parts of the crankshaft supported by and rotating in the main bearing are called the journals . A flywheel of sufficient weight is fastened to the crankshaft and stores kinetic energy during the power stroke and returns it during the other strokes . The flywheel helps to start the engine and also serves to make the rotation of the crankshaft more or less uniform . A camshaft driven from the crankshaft by a chain drive or by a chain drive or by timing gears operates the intake and exhaust valves through cams , cam followers ,push rods ,and rocker arms ,Valve springs serve to close the valves . A crankcase serves to hold together the cylinder ,piston and crankshaft ,to protect all moving parts and their bearings ,and to provide a reservoir oil ,The lower part of the crankcase is called a bedplate .JH125摩托車(chē)發(fā)動(dòng)機(jī)　 了解發(fā)動(dòng)機(jī)各個(gè)部件的工作情況及用途，對(duì)于全面了解整個(gè)發(fā)動(dòng)機(jī)是必要的。每個(gè)部件或組合件都有各自的專(zhuān)門(mén)功用，并與其他部件一起構(gòu)成汽油發(fā)動(dòng)機(jī)。操作、修理或保養(yǎng)汽油發(fā)動(dòng)機(jī)的人，必須一眼便能識(shí)別出各個(gè)不同的部件，并且知道它們特有的作用。對(duì)于發(fā)動(dòng)機(jī)各部件的認(rèn)識(shí)是逐漸的每個(gè)術(shù)語(yǔ)。 發(fā)動(dòng)機(jī)的主要工作部件有：氣缸、汽缸蓋、連桿、曲軸、曲軸軸承和連桿軸承。 汽缸。汽缸是發(fā)動(dòng)機(jī)的心臟，燃油在汽缸中被燃燒并產(chǎn)生動(dòng)力。汽缸里面襯有缸套或套筒。汽缸的內(nèi)徑稱為缸徑。 汽缸蓋封閉著汽缸的一端，它通常帶有進(jìn)排氣門(mén)?？諝夂腿加徒?jīng)進(jìn)氣門(mén)進(jìn)入，廢氣經(jīng)排氣門(mén)排出。 活塞，活塞封閉著汽缸工作空間的另一端，并把由于燃油燃燒而產(chǎn)生的動(dòng)力傳給曲軸。用機(jī)油潤(rùn)滑的活塞環(huán)在活塞和缸套之間形成氣密封?；钊麖臍飧椎囊欢说搅硪欢怂?jīng)過(guò)的距離稱為沖程。 連桿。連桿一端叫做小頭，與裝在活塞中的活塞銷(xiāo)（或叫做肘節(jié)銷(xiāo)）相連。連桿的另一端即連桿大頭，有一個(gè)曲柄銷(xiāo)軸承。在作功沖程時(shí)，連桿將活塞的往復(fù)運(yùn)動(dòng)，轉(zhuǎn)變?yōu)榍N(xiāo)的連續(xù)轉(zhuǎn)動(dòng)，而在其他沖程時(shí)，則與其相反。 曲軸。曲軸在活塞的作用下，通過(guò)連桿和位于曲柄或曲柄扳之間的曲柄銷(xiāo)而轉(zhuǎn)動(dòng)，并吧活塞所做的功傳給驅(qū)動(dòng)軸。由主軸承并在曲軸的旋轉(zhuǎn)大致保持均勻。 由曲軸通過(guò)鏈傳動(dòng)或者正時(shí)齒輪傳動(dòng)的凸輪軸，通過(guò)凸輪、凸輪傳動(dòng)件、推桿和搖臂控制進(jìn)氣門(mén)和排氣門(mén)。氣門(mén)彈簧用來(lái)關(guān)閉氣門(mén)。 曲軸箱將氣缸、活塞、曲軸連成一體，使所有的運(yùn)動(dòng)零件及其軸承得到保護(hù)，并用作潤(rùn)滑油箱。曲軸箱的底部稱為底座。 心 得 體 會(huì) 不覺(jué)間已在機(jī)電學(xué)院生活了兩年，兩年來(lái)，在學(xué)校的指導(dǎo)、老師的教誨和同學(xué)的幫助下，我付出了許多，卻收獲得更多。兩年來(lái)，感受頗多，下面是我畢業(yè)之前的一些感想。畢業(yè)設(shè)計(jì)不僅是對(duì)前面所學(xué)知識(shí)的一種檢驗(yàn)，而且也是對(duì)自己能力的一種提高。通過(guò)這次畢業(yè)設(shè)計(jì)使我明白了自己原來(lái)知識(shí)還比較欠缺。自己要學(xué)習(xí)的東西還太多，以前老是覺(jué)得自己什么東西都會(huì)，什么東西都懂，有點(diǎn)眼高手低。通過(guò)這次畢業(yè)設(shè)計(jì)，我才明白學(xué)習(xí)是一個(gè)長(zhǎng)期積累的過(guò)程，在以后的工作、生活中都應(yīng)該不斷的學(xué)習(xí)，努力提高自己知識(shí)和綜合素質(zhì)。 此外，還得出一個(gè)結(jié)論：知識(shí)必須通過(guò)應(yīng)用才能實(shí)現(xiàn)其價(jià)值！有些東西以為學(xué)會(huì)了，但真正到用的時(shí)候才發(fā)現(xiàn)是兩回事，所以我認(rèn)為只有到真正會(huì)用的時(shí)候才是真的學(xué)會(huì)了。 在此要感謝我的指導(dǎo)老師董老師對(duì)我悉心的指導(dǎo)，感謝老師給我的幫助。在整個(gè)設(shè)計(jì)中我懂得了許多東西，也培養(yǎng)了我獨(dú)立工作的能力，樹(shù)立了對(duì)自己工作能力的信心，相信會(huì)對(duì)今后的學(xué)習(xí)工作生活有非常重要的影響。而且大大提高了動(dòng)手的能力，但是在設(shè)計(jì)過(guò)程中所學(xué)到的東西才是這次畢業(yè)設(shè)計(jì)的最大收獲和財(cái)富，使我終身受益。參考資料《摩托車(chē)專(zhuān)業(yè)英語(yǔ)》《機(jī)械設(shè)計(jì)手冊(cè)》《夾具設(shè)計(jì)手冊(cè)》《機(jī)械技術(shù)基礎(chǔ)》《摩托車(chē)制造技術(shù)基礎(chǔ)》《摩托車(chē)裝配工藝》《汽車(chē)工程手冊(cè)摩托車(chē)篇》《機(jī)械加工工藝手冊(cè)》