Abstract
The operating conditions for the pair of inlet or exhaust valves in a single engine cylinder has been analyzed. The differences for the phase angle position of cams, due to manufacturing faults, vibration and wear, result in differences in valve lifts for such a pair. The use of a single camless drive for the pair of valves cannot eliminate such differences in the valve lifts. When individual drive for each valve is used, the differences can be greater. The aim of the analysis is to determine the needed stiffness of the element connecting the pair of valves with the drive and permissible differences for geometrical and material properties of an individual drive, allowing to obtain the differences for the valve lifts smaller than those for the camshaft case. The analysis has been made using the elaborated FEM model, for two configurations of the camless drive. The paper also presents the dynamic parameters of the valves – drive assembly, stresses in such assembly and recommendations for stiffness of the element connecting the pair of valves with the drive
Highlights
In contemporary engines there is a trend to use four valves per each cylinder, including two inlet valves and two exhaust valves
The valves are mostly driven by cam drives
In the case of an electromechanic drive, e.g. in the studied engines manufactured by Valeo [1] (Fig. 1), they applied a system, in which each driven inlet valve was associated with a single drive
Summary
In contemporary engines there is a trend to use four valves per each cylinder, including two inlet valves and two exhaust valves. In the case of an electromechanic drive, e.g. in the studied engines manufactured by Valeo [1] (Fig. 1), they applied a system, in which each driven inlet valve was associated with a single drive. It is possible to use a camshaft, in which each a single blocked drive serves for driving of two inlet or exhausts valves. In this paper the magnetoelectric drive is analyzed with its two examples of configurations making it possible to realize the blocked drive for two inlet or exhaust valves. The integrated drive was analyzed with its configuration making it possible to realize common driving of two inlet or exhaust valves in a single engine cylinder. The important problem, which occurs while using the blocked or integrated drive of camshaft valves, is the synchronization of motion
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