Abstract: Piston cooling nozzle is the key part of the engine, its own machining quality and assembly accuracy directly affect the reliability of the piston, and it has a very important role in the life of the engine. In order to identify the possible machining quality problems and assembly accuracy problems of piston cooling nozzles in advance, an intuitive and accurate assembly method of piston cooling nozzles is studied from the aspects of nozzle shooting, positioning structure and assembly process control, which could effectively identify the possible machining quality problems and assembly accuracy problems in the assembly stage. lt can greatly reduce the problem of engine cylinder pulling caused by insufficient piston cooling.

Key words: Piston cooling nozzle; Engine parts; Assembly accuracy; Quality of processing

摘要： 活塞冷却喷嘴是发动机上的关键零部件，其自身的加工质量及装配精度直接影响活塞 的可靠性，对发动机的寿命具有十分重要的作用。为了提前辨识活塞冷却喷嘴可能存在的加 工质量问题及装配精度问题，文章从喷嘴打靶、定位结构及装配工艺控制等方面进行分析， 研究了一种直观、准确的活塞冷却喷嘴装配方法，可在装配阶段有效识别可能存在的加工质 量问题以及装配精度问题，能大大减少因活塞冷却不足导致的发动机拉缸问题。

关键词: 活塞冷却喷嘴；发动机零部件；装配精度；加工质量