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对喷油泵顶隙式柱塞偶件、非顶隙式柱塞偶件以及等压出油阀、阻尼阀做交叉试验，通过喷油泵泵端压力、嘴端压 力、喷油速率、喷油始点、单喷射油量的检测分析，研究当前直列高喷射压力条件下，顶隙式柱塞偶件的喷油提前特性及 其对喷油泵综合性能的影响。研究结果表明，在喷油泵工作转速与循环油量范围内，顶隙式柱塞偶件较普通型柱塞偶件 而言，有1．8°的喷油提前功能，泵端压力、嘴端压力、喷油速率性能基本一致。除此以外，顶隙式柱塞偶件还可以降低喷 油泵中、低速油量，从而可以调整供油速度特性。
On the fuel injection pump headcap-type coupling parts, non-head-mounted piston and even the pressure out of the valve, the damping valve to do the cross test, pump pressure through the pump, the nozzle pressure, fuel injection rate, fuel injection starting point , Single-jet fuel testing and analysis to study the current in-line high injection pressure conditions, the head-topping-style plunger coupling fuel injection advance characteristics and performance of the injection pump. The results show that, in the operating speed of the injection pump and the circulating oil volume range, the tip-cap-type plunger has a 1.8 ° injection advance function compared with the ordinary plunger. The pump end pressure, Pressure, fuel injection rate performance is basically the same. In addition, the head-mounted plunger coupling can also reduce the fuel injection pump, low-speed fuel, which can adjust the speed characteristics of the oil supply.