新型雙搖臂式汽門機構的設計與動態模擬分析

Design and Dynamic Simulation Analysis of the New Double-Rocker Valve Mechanism

杜政憲(JHENG-SIAN DU)

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(2011年)

https://doi.org/10.6827/NFU.2011.00013

摘要

本研究針對新型雙搖臂式汽門機構作初步電腦輔助設計及動態模擬分析，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可變汽門正時與可變升程。首先以市售125cc機車引擎為基底，利用SolidWorks 軟體適度加以簡化繪製之後，轉匯入機構分析軟體ADAMS裡。先建立基底機構之動態分析，其模擬結果並予實際數據比對調校。接著保留原來凸輪和汽門閥等元件，並將原凸輪曲線做適度比例縮小以及保留原有升程曲線作為基底曲線，來開始設計新型機構。初步設計的重點放在新型第一搖臂與第二搖臂軸心位置及空間配置，接著是針對第二搖臂的推頂曲面，找出可行之曲面產生法則，再進行機構動態模擬分析與比較，結果將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 ； 固定搖臂 ； 調整搖臂 ； 可變控制軸

並列摘要

This study aims at making initial computer-aided design and dynamic simulation analysis on a new double-rocker variable timing and lift valve mechanism, 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 variable control shaft, and thereby can be followed by the axial movement to achieve variable valve timing and variable lift of the control shaft. A mechanism model is constructed using the software SolidWorks based on a 125cc motorcycle engine, and imported into the simulation software ADAMS for further analysis. First, the dynamic simulation analysis is carried out on the base mechanism. The simulation results are compared with the tested results. Then the design of the new mechanism is started with keeping the original models of cam and valve unchanged, properly scale down the original cam contour, and preserve the original lift profile as the base profile. In initial stage, the design is focused on determining the positions of the rotational centers and spatial layout of the first rocker and the second rocker. It is followed by finding a feasible curve-generating algorithm for the pushing surface of the second rocker. The generated curve is used to simulate the corresponding lift profile and compare it with the base profile. The results can serve as an important reference for future development of the proposed new mechanism.

並列關鍵字

Variable Valve Timing ； Variable Lift ； Fixed Rocker Arm ； Adjustable Rocker Arm ； Variable Control Shaft

參考文獻

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