Based on the mechanism of lubricating oil consumption,taking a 12v diesel engine as the research object,the dynamic simulation model of piston assembly was established,and the influence of piston pin offset mode and amount on lubricating oil consumption was analyzed.The results show that the offset mode of piston pin generally leads to the decrease of lubricating oil consumption,improves the oil channeling and oil throwing obviously,and the piston pin offset to anti-thrust side(ATS)has the best effect on reducing the consumption of lubricating oil.The offset of piston pin has a great influence on the consumption of lubricating oil.When the offset increases,the oil channeling first decreases and then increases,and the oil throwing decreases continuously.When the piston pin deviates 3 mm to ATS,the best comprehensive effect on reducing lubricating oil consumption is obtained.With the increase of diesel engine speed,the consumption of lubricating oil shows a growing trend,resulting in the reduction of engine efficiency.