许雪利^1,2，成敬敏^1,2，史美丽^1,2，齐宝丹^1,2，张兆栋^1,2

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

摘要：为解决某发动机润滑系统功能试验中出现的机油温度过高问题，根据发动机润滑系统原理，通过台架试验和仿真计算对旁通阀常开、摩擦副间隙、机油泵流量及结构、机油冷却器散热量、油底壳材质等可能造成机油温度高的因素进行排查及分析，并对机油冷却器进行改进。结果表明：机油泵流量偏大、结构不合理及机油冷却器散热能力差是机油温度过高的主要原因；采用小流量的机油泵、增加机油冷却器的层数、在机油冷却器壳体增加导流筋，可以提升机油冷却器的散热能力及水流场的均匀性，降低机油温度。该研究可以为降低发动机机油温度、提高发动机可靠性提供参考。

关键词：润滑系统；机油温度过高；台架试验；优化

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