- 學位論文
可變汽門揚程機構與汽缸頭之整合設計
Integrated Design of Variable Valve Lift Mechanisms and Cylinder Head
摘要
本研究欲設計出具備雙自由度之可變汽門揚程裝置，分別以七連桿八接頭(7R1P)與五連桿五接頭(4R1P)兩種構造作設計，藉由調整汽門揚程之高度，以求高速運轉時馬力輸出大，中低速則具備充沛扭力，且於怠速時，能以較低的進氣量運轉，藉此提高燃油效率，達到節能的目的，且4R1P部分由於構造簡單，相較於市售產品，有降低成本之優勢，另外設計過程中考慮現有汽缸頭之幾何尺寸，以提升應用於引擎之可能性。本研究將延續過去之可變汽門揚程裝置論文進行更加深入之研究，過程中參考其專利分類與分析與機構型態，之後依據設計規格擬定較佳機構型態，並繪製機構3D以進行細部設計，隨後使用CAD軟體做動態模擬，以此推估合宜的模型尺寸，經以上流程後，本研究最終設計出可應用之可變汽門揚程裝置並已提出專利申請。
並列摘要
This research is to design variable valve lift devices with two DOF, based on seven links eight joints (7R1P) or five links five joints (4R1P) chains. Adjusting valve lift may increase output horsepower at high speed, provide sufficient torque at moderate or low speed, and reduce air intake and oil consumption at idle speed. The 4R1P design with simpler structure has the superiority of low cost compared to the existing products. In the design procedures, the geometric dimensions of the present cylinder head were used to ensure the possibility of practical application in the engine. This research followed previous research about variable valve lift devices and put one more step forward. During the process, different patents were collected and analyzed; better mechanism type was decided according to design specifications; 3D model was constructed for detailed design; CAD software was used for motion simulation to evaluate proper linkage size. Finally, usable variable valve lift devices were developed and filed for new patent.