本文選題：柴油機(jī) + 配氣機(jī)構(gòu)�。� 參考：《大連理工大學(xué)》2011年碩士論文

【摘要】：作為內(nèi)燃機(jī)重要組成部分的配氣機(jī)構(gòu),其性能直接影響內(nèi)燃機(jī)的動(dòng)力性、經(jīng)濟(jì)性和耐久性。所以,當(dāng)前內(nèi)燃機(jī)研究的重要方向之一就是分析配氣機(jī)構(gòu)的動(dòng)力學(xué)性能。隨著人們對(duì)發(fā)動(dòng)機(jī)的性能的要求不斷提高,針對(duì)發(fā)動(dòng)機(jī)的配氣機(jī)構(gòu)的動(dòng)力學(xué)分析具有重要意義。 本文以某型柴油機(jī)配氣機(jī)構(gòu)實(shí)體為模型,在Pro/Engineer中建立挺柱、推桿、搖臂、進(jìn)、排氣門、進(jìn)、排氣門座、進(jìn)、排氣門彈簧座、氣門鎖夾等實(shí)體模型,并進(jìn)行組裝。同時(shí),計(jì)算這些零部件的質(zhì)量、剛度、阻尼。然后,應(yīng)用AVL-Excite Timing Drive軟件,建立柴油機(jī)配氣機(jī)構(gòu)的動(dòng)力學(xué)模型,并進(jìn)行計(jì)算分析。 根據(jù)所建立的配氣機(jī)構(gòu)的動(dòng)力學(xué)模型,在發(fā)動(dòng)機(jī)轉(zhuǎn)速為1000rpm時(shí),當(dāng)進(jìn)氣門間隙分別為0.4mm和0.3mm時(shí),對(duì)配氣機(jī)構(gòu)的進(jìn)、排氣門進(jìn)行動(dòng)力學(xué)計(jì)算,得出了進(jìn)、排氣門升程、速度、加速度、凸輪與挺柱間接觸力、氣門與氣門座間接觸力、彈簧中心質(zhì)量位移等曲線,實(shí)現(xiàn)了配氣機(jī)構(gòu)的運(yùn)動(dòng)學(xué)和動(dòng)力學(xué)分析。將得到的結(jié)果曲線與實(shí)驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比,發(fā)現(xiàn)升程曲線與設(shè)計(jì)的理論升程基本一致,各零部件的受力沒有超過允許的范圍,說明建立的這個(gè)模型是可行的。同時(shí),對(duì)不同氣門間隙的進(jìn)氣門結(jié)果曲線進(jìn)行對(duì)比,發(fā)現(xiàn)較大氣門間隙的進(jìn)氣門在氣門開啟和落座時(shí)的加速度和氣門與氣門座間接觸力震蕩較大,說明氣門間隙的大小對(duì)于配氣機(jī)構(gòu)動(dòng)力學(xué)特性有較大影響。
[Abstract]:As an important part of internal combustion engine, its performance directly affects the power, economy and durability of internal combustion engine. Therefore, one of the most important research directions of internal combustion engine is to analyze the dynamic performance of valve train. With the improvement of engine performance, it is of great significance to analyze the dynamics of engine valve train. In this paper, the solid models of tappet, push rod, rocker arm, intake, exhaust valve, intake and exhaust valve seat, inlet and exhaust valve spring seat, valve lock clamp and so on are established and assembled in Pro/Engineer. At the same time, calculate the mass, stiffness and damping of these parts. Then, using AVL-Excite Timing Drive software, the dynamic model of diesel engine valve train is established and analyzed. According to the established dynamic model of the valve distribution mechanism, when the engine speed is 1000rpm, when the intake valve clearance is 0.4mm and 0.3mm, the intake and exhaust valve of the valve valve are calculated dynamically, and the intake and exhaust valve lift and velocity are obtained. The kinematics and dynamics analysis of the valve distribution mechanism is realized by the curves of acceleration, contact force between cam and tappet, contact force between valve and valve seat, and mass displacement of spring center. By comparing the result curve with the experimental data, it is found that the lifting curve is basically consistent with the designed theoretical lift, and the force of each component does not exceed the allowable range, which shows that the model is feasible. At the same time, by comparing the result curves of intake valve with different valve clearance, it is found that the acceleration of inlet valve with larger valve clearance and the vibration of contact force between valve and valve seat are larger when the valve opens and sits. It shows that the size of valve clearance has great influence on the dynamic characteristics of valve distribution mechanism.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TK423;TH113

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本文編號(hào)：1783854