【正文】 most modern Ottocycle engines. Higher pression ratios, up to about 15 to 1, with a resulting increase of efficiency, are possible with the use of highoctane antiknock fuels. The efficiencies of good modern Ottocycle engines range between 20 and 25 percent— in other words, only this percentage of the heat energy of the fuel is transformed into mechanical energy Theoretically, the diesel cycle differs from the Otto cycle in that bustion takes place at constant volume rather than at constant pressure. Most diesels are also fourstroke engines but they operate differently than the fourstroke Ottocycle engines. The first, or suction, stroke draws air, but no fuel, into the bustion chamber through an intake valve. On the second, or pression, stroke the air is pressed to a small fraction of its former volume and is heated to approximately 440176。制定工藝路線時主要考慮粗、精加工安排、加工方法選擇、工序集中與分散、加工順序等方面的要求。根據(jù)這四種發(fā)動機的優(yōu)點，把它們應(yīng)用于不同的工況?；钊纳舷逻\動使得氣缸與活塞間的空間發(fā)生大小變化，從而改變壓縮空間的大小。 內(nèi)燃機的燃料供給系統(tǒng)又油箱、油泵、和分油管以及使液體燃料霧化的機構(gòu)組成。這樣燃料就會在汽缸里混合，這比化油器混合更充分，污染更小。一些飛機、汽車、和船只上的舷外發(fā)動機采用風(fēng)冷。有時候在大型發(fā)動機上，會有慣性啟動裝置，或者是借助手工輸入力矩知道驅(qū)動能量能使 曲軸轉(zhuǎn)動。在最后一個 行程中，排氣門打開，活塞的上行會對燃燒后的氣體進行擠壓，是廢氣排出燃燒室，做好下一循環(huán)的準(zhǔn)備。首先，在進氣時，活塞向下運動，并通過進氣門將空氣吸進燃燒室。事實上，柴油機的曲軸轉(zhuǎn)速的 100— 750 轉(zhuǎn)每分鐘，這等同于奧托式發(fā)動機的 2500— 5000 轉(zhuǎn)每分鐘。緊接著，燃料開始壓縮，并在活塞到達上至點是點燃。正因為轉(zhuǎn)子發(fā)動機與柴油機相比，結(jié)構(gòu)緊湊、質(zhì)量輕，因而在汽車發(fā)動機中作用很大?；鸹ㄈ麜赛c燃多余部分的混合氣，在將另一部分點燃。 發(fā)動機采用火花點火的改進方式，進行分層點火稀薄燃燒，幫助沒有使用廢氣再循環(huán)和催化轉(zhuǎn)換器的發(fā)動機減小排放量。然后， 廢棄就會隨著轉(zhuǎn)子的運動從排氣口排出。在最簡單的二沖程發(fā)動機上，排氣門被廢氣管代替了。柴油機的效率，跟一般的奧托式發(fā)動機是受同樣的因素所影響的，但是稍好于奧托式發(fā)動 機。理論上，柴油周期相比奧托循環(huán)的區(qū)別在于，它的壓縮過程是等容、等壓的。接著的行程，就是將混合后的氣體壓縮到燃燒室里。汽車發(fā)動機的啟動要靠一個與曲軸箱嚙合的摩擦片，通過摩擦片的分離才能向外輸出力矩。在火花塞末端的兩極間有一個間隙，高壓電流會擊穿這個點火間隙，從而點燃汽缸中的混合氣體。在上世紀 80 年代，缸內(nèi)直噴技術(shù)開始用于內(nèi)燃機領(lǐng)域，從很大程度上代替了傳統(tǒng)的燃油與空氣相混合的技術(shù)。這樣能夠使曲軸運動的慣性最小化，達到平衡的目的。 奧托式發(fā)動機和柴油機的基本構(gòu)造都是一樣的。 關(guān)鍵字： 活塞；工藝路線；加工設(shè)備；切削用量；夾具 任何通過燃料在氣缸中燃燒，使燃油的化學(xué)能轉(zhuǎn)化為機械能，從而獲得動力的引擎都成為內(nèi)燃機。在本設(shè)計中將對活塞的加工工藝進行設(shè)計，以保證活塞長久穩(wěn)定工作。 Rocket. The Ottocycle engine, named after its inventor, the German technician Nikolaus August Otto, is the familiar gasoline engine used in automobiles and airplanes。C) gas role, and the pressure through the piston pin, connecting rod to the crankshaft. Can be seen that the piston is a long time under high temperature and high pressure in continuous reciprocating motion of the load, its load and working conditions were appalling. During the design process of the piston will be designed to ensure longterm stability of the work piston. The design of the work done by a brief introduction as follows:Diesel Engine Piston 180C reasonable processing technology is important, the role of parts and technology program analysis, preparation of rough form and process manufacturing line, through the analysis, parison, use of the relative concentration of processing programs, and ultimately more reasonable to determine the mechanical line processing. The development process of rough line the main consideration, finishing arrangements, choice of processing methods, centralized and decentralized processes, such as processing the order requirements. Then determine the allowance, process size, after the analysis of the characteristics of the process, select the appropriate processing equipment and technical equipment. Calculated lookup table to determine the next major piston cutting process and the mapping of processes card, the design of the final fixture. Fixture design, it is necessary to take various aspects into account, the strict requirements of the fixture a direct impact on the surface of the workpiece processing position accuracy. Therefore, the machine tool design fixture design is an important task is the processing of one of the most active. During the graduation project in a specially designed positioning accuracy, simple structure and easytouse precision pin hole