基于proe的四缸內(nèi)燃機(jī)凸輪配氣機(jī)構(gòu)的結(jié)構(gòu)及運(yùn)動(dòng)仿真分析畢業(yè)論文-全文預(yù)覽
【正文】 件將配氣機(jī)構(gòu)的骨架搭建好以后，就可以根據(jù)骨架創(chuàng)建各組件的三維模型了。氣門桿長度L:氣門桿長度決定于氣缸蓋和氣門彈簧的設(shè)計(jì)，一般總希望短些，以便降低發(fā)動(dòng)機(jī)的總高度，減小氣門的質(zhì)量，通常L=（~）D，D是氣門的頭部直徑。此內(nèi)燃機(jī)采用的是曲面挺柱，它的特點(diǎn)是結(jié)構(gòu)簡單，質(zhì)量輕。 挺柱的設(shè)計(jì)挺柱的功能是按凸輪的運(yùn)動(dòng)規(guī)律推動(dòng)傳動(dòng)機(jī)構(gòu)，同時(shí)承受凸輪的側(cè)向壓力。 ~，范圍內(nèi)，~。整機(jī)骨架除了需要確定發(fā)動(dòng)機(jī)結(jié)構(gòu)的基本布置形式，如發(fā)動(dòng)機(jī)的氣門驅(qū)動(dòng)形式，直列還是V 型，還需確定發(fā)動(dòng)機(jī)整機(jī)的基本參數(shù)，如缸數(shù)、缸徑、行程、點(diǎn)火順序、沖程數(shù)、缸心距等。骨架模型能同時(shí)控制組件的大小和形狀。 2 基于Pro /E 的配氣機(jī)構(gòu)的結(jié)構(gòu)設(shè)計(jì) 2． 1 配氣機(jī)構(gòu)總體骨架設(shè)計(jì)骨架在大型產(chǎn)品的裝配設(shè)計(jì)建模中是非常重要的。隨著發(fā)動(dòng)機(jī)強(qiáng)化程度的不斷提高, 配氣機(jī)構(gòu)已經(jīng)成為發(fā)動(dòng)機(jī)發(fā)展過程中的一個(gè)重要而且困難的環(huán)節(jié)。而配氣機(jī)構(gòu)性能的好壞, 直接影響到發(fā)動(dòng)機(jī)的經(jīng)濟(jì)性、可靠性, 并對發(fā)動(dòng)機(jī)噪聲與振動(dòng)產(chǎn)生直接影響。發(fā)動(dòng)機(jī)在車輛中是動(dòng)力部件，其性能直接影響車輛在使用中的工作狀況和可靠性。同時(shí)，設(shè)備在工作時(shí)產(chǎn)生的振動(dòng)和噪聲，會(huì)損害操作者的身心健康，污染環(huán)境。目前，國際上已有各種配氣凸輪設(shè)計(jì)軟件，國內(nèi)也出現(xiàn)了一些類似的軟件，這些軟件在速度與計(jì)算精度上都有所提高。作為發(fā)動(dòng)機(jī)的重要組成部件，配氣機(jī)構(gòu)的研究內(nèi)容從最初單純的凸輪經(jīng)驗(yàn)設(shè)計(jì)，發(fā)展到常將配氣機(jī)構(gòu)傳動(dòng)鏈當(dāng)作完全剛性物體只進(jìn)行運(yùn)動(dòng)學(xué)計(jì)算，再發(fā)展到了整個(gè)配氣機(jī)構(gòu)的運(yùn)動(dòng)學(xué)與動(dòng)力學(xué)的綜合研究。 Optimal design。汽車；發(fā)動(dòng)機(jī)；配氣系統(tǒng)；頂置凸輪；動(dòng)態(tài)仿真Based on the PRO / E four cylinder internal bustion engine cam mechanism design and motion simulation analysisAbstract:The valve train is one of the most important mechanisms in a internal bustion engine, whether the performances are good or bad, that affecting the power performance, economic performance, emissions performance of the engine, as well as affecting the reliability and wear performances of the whole engine. Along with the requests of the engine’s high power, superspeed, people demand a higher index. That is, when the engine runs under a high speed, it can still work steadily and dependably, which demand that the valve train system should have a high performance. Cam profile is the hard core of the valve train, which design is one of the important ways to carry out valve train optimal design. Simulation calculation and experimentation research are two important ways to carry out research and development on valve train of internalbustion engine.Valvetrain has been dynamically simulated by the multibody theory model has been built for the valve train by using the digital multibody only the lift height,speed and acceleration of valve but also the collision between valve and rocker and the flexibility of rocker support are taken into , the collision force between valve and rocker ,loading on the flexible bearing of rocker support, valve spring force, can support counter force, valve ring counter force and direction angle of acting force between cam and rocker have been carried out. The important basis on design improvement for cam profile, rocker form and valve form and valve train have been paper analyzed the dynamic characteristics of a camtype valve t rain and the influence o f the spring stiffness on the systematic mot ion by using Pr o / E .The relationship between stiffn
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