탄성 변형을 고려한 피스톤 스커트부의 마찰 특성 연구

In this paper, the friction loss in piston skirt has been calculated considering elastic deformation of piston. Bothof the secondary motion of piston and the mixed lubrication theory have been applied to the analytical dynamic model of piston, and the stiffness matrix of piston skirt, calculated through FEM, has been added as well. The effect of geometrical piston design parameters on the friction loss has been investigated. A small piston pin offset was more effective on the reduction of the friction loss. The friction loss was largely affected by the piston CG position in high speed, but little in low speed. From the parametric study, it is found that the crank offset is the most important piston design parameter to the reduction of the friction loss in piston skirt.