王睿1,2，周兆鹏1,2，杨文钊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，山东潍坊261061

摘要：为解决某轻型柴油机开发过程中正时皮带磨损断裂故障，基于故障树分析法分析此次故障的产生原因，采用测量及仿真计算等方法对各原因进行分析与排除，故障原因确定为喷油泵与正时皮带的相位匹配未达到最优，导致正时错乱。提出了正时皮带相位的优化方案，发动机耐久试验结果表明优化方案有效，最优的油泵相位为+6相位。

关键词：喷油泵；正时皮带；相位；曲轴转角

Abstract:In order to solve the wear and fracture fault of the timing belt in the development process of a lightdiesel engine, the fault tree analysis method is used to find out the reason of the fault. The experiments and simulation results show that the cause of the fault is the phase matching between the fuel injection pump and the timing belt is not optimal, which leads to the timing disorder. An improvement of the timing belt phase is proposed, and the results of durability test show that the optimized scheme is effective, and the optimal pump phase is + 6 phase.

Keywords:fuel injection pump; timing belt; phase position; crank angle