Local pressure leveling design method for multi-link mechanism for variable compression ratio engine

In the multi-link mechanism of a variable compression ratio engine, the stiffness of the end of the housing increase by adopting the slit structure, this eventually led to an increase in pressure concentrate locally at a certain contact point at the end of the sliding surface of the lower link bearing. As a design solution, this is a report of how to disperses/reduces the generated axial pressure by optimizing the shape of the sliding surface based on FEM/EHD, which are estimated by considering the deformation characteristics of lower link mechanism.