1.内燃机可靠性国家重点实验室，山东 潍坊 261061；2.潍柴动力股份有限公司发动机研究院，山东 潍坊 261061
Abstract：In order to solve the problem of high oil temperature in lubrication system function test of an engine, according to the engine lubrication system schematic diagram, through the method of bench test verification and simulation calculation, several possible causes including by-pass valve normally open, friction pair clearance, oil pump flow and structure, heat dissipation of oil cooler, oil sump material are investigated and analyzed. The results show that the main causes of high oil temperature are large flow rate of oil pump, unreasonable structure and poor heat dissipation capacity of oil cooler. Using a small flow oil pump, increasing the number of layers of the oil cooler, and adding a guide rib to the oil cooler shell can improve the heat dissipation capacity of the oil cooler and the uniformity of the water flow field, and reduce the oil temperature. This study can be used as a reference for reducing engine oil temperature and improving engine reliability.
Keywords:lubrication system; high oil temperature; test bench; optimize