关键词: 活塞冷却喷嘴；发动机零部件；装配精度；加工质量

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