Motion characteristic of hydraulic driven fully variable valve mechanism
SUN Changlin
XIE Zongfa
Abstract：In order to improve the performance of the fully variable valve timing mechanism under high-speed working conditions,taking a hydraulic driven fully variable valve mechanism as an example,ADINA software is used to perform computational fluid dynamics(CFD)simulation analysis on the valve motion law and pressure fluctuations in the hydraulic system of the valve mechanism,and experimental research and comparison are conducted with the K157 engine.The results show that by adjusting the oil leakage phase angle,the simulation model of the valve timing mechanism can achieve fully variable valve timing phase and valve lift.The phase angle of oil leakage has a significant impact on the valve motion law,while the crankshaft speed has a relatively small impact on the valve motion law.Excessive pressure fluctuations in the hydraulic system seriously affect the reliability of the mechanism.Based on theoretical analysis,the performance of the valve mechanism can be improved by reducing the mass of the moving components,adopting a DC channel,increasing the design stiffness and preload of the valve spring,and so on.
Keywords：fully variable valve mechanismCFDmovement of valvepressure fluctuation
Publication Date：2023-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 29-34 )