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內也出現了一些類似的軟件,這些軟件在速度與計算精度上都有所提高。 電子計算機的采用和測試技術的發(fā)展為配氣機構動力學的研究開辟了新途徑。 作為發(fā)動機的重要組成部件,配氣機構的研究內容從最初單純的凸輪經驗設計,發(fā)展到常將配氣機構傳動鏈當作完全剛性物體只進行運動學計算,再發(fā)展到了整個配氣機構的運動 學與動力學的綜合研究。通過對配氣機構的動態(tài)模擬可以知道各零件的真實運動情況和載荷變化規(guī)律, 可以知道配氣機構出現飛脫、氣門反跳等不正?,F象的條件, 判斷機構設計是否合理, 工作是否安全可靠。 Optimal design。 Valve train。汽車;發(fā)動機;配氣系統(tǒng);頂置凸輪;動態(tài)仿真 Based on the PRO / E four cylinder internal bustion engine cam mechanism design and motion simulation analysis ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ Abstract: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 stiffness of spring and vibration of valve was got ten. The work ha s provided a basis for improving the system39。利用計算機軟件仿真 , 有利于降低研發(fā)成本并縮短產品的開發(fā)周期。為凸輪型線、搖臂形狀和整個配氣機構的設計改進提供了重要依據。 運用多體力學的方法對配氣機構進行了動態(tài)仿真分析,采用數字多體程 序的方法,建立了配氣系統(tǒng)的理論模型,進行配氣機構的運動學、動力學分析,除了得到氣門的升程、速度、加速度外,還考慮了搖臂與氣門之間的碰撞,以及搖臂支座的柔性。配氣凸輪型線是配氣機構的核心部分,配氣凸輪型線設計是配氣機構優(yōu)化設計的重要途徑之一。 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 湖北文理學院 畢業(yè)設計 (論文 )正文 題 目 基于 PRO/E的四缸內燃機凸輪配氣機構的結構設計及運動仿真分析 專 業(yè) 機械設計制造及其自動化 班 級 機制 0812班 姓 名 學 號 指導教師 職 稱 2021 年 5 月 23 日 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 基于 PRO/E 的四缸內燃機凸輪配氣機構的結構設計及運動仿真分析 摘要 : 配氣機構作為內燃機的重要組成部分,其設計合理與否直接關系到內燃機的動力性能、經濟性能、排放性能及工作的可靠性、耐久性。隨著內燃機高功率、高速化,人們對其性能 指標的要求越來越高,要求其在高速運行的條件下仍然能夠平穩(wěn)、可靠地工作,因而對其配氣機構提出了更高的要求。模擬計算和實驗研究是內燃機配氣機構研究兩種重要手段。因此得到氣門與搖臂之間的碰撞力,搖臂支座的柔性襯套 的受力,氣門彈簧力,凸輪軸支座反力,氣門座反力及凸輪與搖臂之間的壓力角等。 利用 pro/e強大的分析仿真功能 , 對凸輪式配氣機構的運動特性以及彈簧剛度對系統(tǒng)運動的影響進行了仿真分析 , 得出彈簧剛度與氣門振動的關系圖 , 為改善系統(tǒng)動力學性能和關鍵零部件設計提供了依據。 關鍵詞: 內燃機;配氣機構;凸輪型線;優(yōu)化設計 。s dynamic char act eristics and designing the key ponents. T hereby , puter simulation can cut down the pro duct cost and shorten the development cycle. Key words: Internal bustion engine。 Cam profile。Automobile Engine Valve train system Overhead camshaft Dynamic simulation ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊