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D80推土机的NH-220-CI高速柴油机,只有近20%的新车达到或接近厂方规定万小时大修的标准,其余大部分只使用2000～3000h或5000～6000h就发生主轴瓦合金脱落,严重者主轴瓦与曲轴咬合,曲轴严重损坏事故。经分析,我们认为除润滑油质量外,一是外界温度变化,二可能是NH-220-CI发动机润滑系统缺少一个稳定最低油压的保护装置。NH-220-CI发动机的润滑油路如图1所示。目前,国产内燃机大都采用混合润滑方式,其特点是最高油压由限压阀控制,系统中最小油量和最低压力由溢流阀控制(主要是指安全
D80 bulldozer NH-220-CI high-speed diesel engine, only nearly 20% of the new car to reach or close to the factory standard million hours of overhaul, the rest of most only use 2000 ~ 3000h or 5000 ~ 6000h spindle bearing alloy shedding, severe Main bearing and crankshaft occlusion, crankshaft serious damage accident. The analysis, we believe that in addition to the quality of lubricating oil, one is the outside temperature changes, the second may be NH-220-CI engine lubrication system lacks a stable minimum oil pressure protection device. NH-220-CI engine lubricant circuit shown in Figure 1. At present, most domestic-made internal combustion engines use hybrid lubrication, which is characterized by the maximum pressure controlled by the pressure limiting valve, the system of minimum fuel and minimum pressure relief valve control (mainly refers to safety