使用ADAMS在新型雙搖臂式無段可變正時與升程汽門機構動態模擬分析

Dynamic Simulation and Analysis Using ADAMS on a New Double-Rocker Variable Timing and Lift Valve Mechanism

陳裕智(Yu-Zhi Chen)

指導教授 ： 鐘證達

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2010年)

摘要

本研究使用ADAMS針對一新型雙搖臂式無段可變正時與升程汽門機構做動態模擬分析，探討幾個包括汽門彈簧及調整搖臂復歸彈簧的彈性係數值和預負荷等主要設計參數，對系統裡搖臂連桿與汽門升程位移的影響，利用田口法整理分析模擬之數據，求得新型與傳統汽門機構彈簧彈性係數值和預負荷值的最佳組合，並藉由此分析值，針對傳統的機構及兩種新型可變汽門機構做凸輪瞬間扭力及消耗功率的模擬比較。此新型機構是將傳統汽門機構之單搖臂，改良成兩組搖臂，其中第一搖臂組有固定搖臂及調整搖臂；調整搖臂中有調整溝槽，其與一可變控制軸上之調整凸件相接，藉此可經由控制軸之軸向運動來達成汽門無段升程變化。研究結果顯示，田口法可以對汽門機構之主要設計參數做快速、有效的性能靈敏度分析，並得到一最佳參數值組合，可作為未來發展此新型可變汽門機構之重要參考。

關鍵字

可變汽門正時 ； 可變升程 ； 無效運動 ； 田口法

並列摘要

This study aims at dynamic simulation and analysis on a new double-rocker variable timing and lift valve mechanism conducted by using ADAMS, which is to optimize the preloaded value of the return spring for the adjustable rocker arm as well as the values of stiffness coefficient for the return springs on the first and second rocker arm according to how they affect the dynamic displacement of the rocker arms and the instantaneous valve lift. The optimal combinations of the selected design parameters for both the conventional and proposed new valve system are obtained by analyzing the simulation data using Taguchi method. The corresponding instantaneous power consumption and torque are further calculated for comparing and evaluating their performance and efficiency. The proposed system is intended to modify the conventional single rocker arm into a set of two rocker arms, called the first and second rocker arms respectively. The first rocker arm consists of a fixed rocker arm and an adjustable rocker arm. The latter is held by the adjusting slots engaging with the adjusting lugs on the control shaft, and thereby can be followed by the axial moment of the control shaft. The results show that the Taguchi method can quickly and effectively perform the sensitivity analysis of performance on the selected major design parameters. The calculated optimal combinations of the design parameters can be a valuable reference for the future development of this proposed new valve system.

並列關鍵字

Variable Valve Timing ； Variable Lift ； Ineffective Movement ； Taguchi Method

參考文獻

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