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随着发动机的不断强化,活塞的热负荷越来越高,常规的冷却已不能满足要求。为保证发动机的性能,因而采用了对活塞内腔顶部进行喷油冷却的结构措施。近年来广泛使用的是在机体的润滑油道上安装专用冷却喷嘴,对活塞内腔顶部进行强制喷油冷却。在使用中要保证冷却喷嘴畅通、有效,否则将因得不到喷油冷却而使活塞顶部与第一道环槽的温度升高,造成活塞顶部异常膨胀、烧蚀,甚至拉缸;环槽温度升高使机油胶结,造成卡环等发动机故障。下面以解放CA1380P4K2L11T4重型卡车为例分析活塞冷却喷嘴失效引发的发动机故障。该车发动机型号为CA6DF2-26,活塞冷却喷嘴安装在发动机机体的主油道上,活塞采用内冷油腔设
As the engine continues to strengthen, the piston heat load is higher and higher, conventional cooling can not meet the requirements. To ensure the performance of the engine, thus using the top of the piston cavity injection cooling structure measures. In recent years widely used in the body of the lubricating oil to install a dedicated cooling nozzle, the top of the piston cavity forced injection cooling. In use to ensure that the cooling nozzle unobstructed and effective, otherwise it will not get the fuel injection cooling and the piston top and first ring groove temperature, causing abnormal expansion of the top of the piston, ablation, and even pull the cylinder; ring groove Increased temperature causes the oil to bond, causing engine problems such as snap rings. The following to liberate CA1380P4K2L11T4 heavy truck as an example analysis of piston cooling nozzle failure caused by engine failure. The car engine model CA6DF2-26, the piston cooling nozzle installed in the main body of the engine oil, the piston is equipped with an internal cooling oil chamber