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D80A-15型推土机经大修之后,发现4D155型发动机机油压力偏低,经过多次故障检验,发现是机油泵安全阀溢流严重,造成漏损所致。而安全阀溢流严重,是由于溢流阀的柱面密封副磨损,间隙过大,使机油泵安全阀处于不正常地溢流状态,造成机油泵出口压力下降,流量减少。这是引起发动机机油压力低的主要原因。图1为原机机油泵安全阀结构简图,它是
After overhauling the D80A-15 bulldozer, the engine oil pressure of the 4D155 engine was found to be low. After several failure tests, it was discovered that the oil pump safety valve overflowed seriously and caused leakage. The overflow of the safety valve is serious due to the abrasion of the cylindrical seal pair of the overflow valve, and the clearance is too large. As a result, the safety valve of the oil pump is in an abnormally overflowing state, which causes the outlet pressure of the oil pump to drop and the flow rate to decrease. This is the main reason for the low engine oil pressure. Figure 1 is a schematic diagram of the original engine oil pump safety valve structure, which is