Abstract
This paper presents the study of a multibody virtual model, of a finger follower valve train system. The valve train mechanism has a very important role in the insurance of the economic and ecological performances, reason why it is important to assure its good functioning. The high speeds influence negatively the dynamic behavior of the valve train; this is why their thorough examination is required. The paper presents the analysis of a mechanism based on a single valve actuation system. The model used in this study, it is partly flexible. The spring model is designed using PDS (Powertrain Dynamic Simulator), a Virtual Lab tool. For this model the action of the valve is made indirectly, through the use of a finger follower, which is sustained at one end by a hydraulic lash adjuster. The first part of this paper, presents the conceptual model, which was designed using CATIA, Part Design module, and the cam's profile, which was used to generate the cam. The second part includes the description of the dynamic model used in analysis, and the comparison of the simulations results. Accelerations were considered as control parameters.
Keywords: valve train, hydraulic lash adjuster, multibody simulation, internal combustion engine, dynamic analysis.