高压共轨喷油嘴G3S14共轨油咀F453

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高压共轨喷油嘴G3S14共轨油咀F453

喷油泵的喷油时间是指发动机在运转中，喷油嘴向汽缸喷射燃油的开始时刻（用曲轴旋转角度表示）。柴油喷人汽缸后，与空气混合成可燃混合气，为保证可燃混合气燃烧充分，且在上止点后某一时刻燃烧压力达到最大值，以确保柴油机正常工作。喷油器必须在压缩上止点前某一时刻开始喷油。发动机在不同负荷和转速下，对应有不同的喷油开始时刻。在标定负荷下对应的喷油开始时刻叫标定喷油时间。在使用中，按理应检查标定负荷时的喷油时间，但由于受条件和设备的限制，用检查供油时间来代替。喷油泵的供油时间，是指手油门在最大位置时，摇转曲轴驱动柱塞泵油，在刚封闭进油孔顶开出油阀的瞬间（用曲轴转角表示）。GS 4NY3004 83 22 69

Injection nozzles for diesel engines inject the fuel into the combustion chamber, atomize it and seal the combustion chamber by means of the nozzle needle. In the Common Rail System, the injection nozzle is part of the injector.

The injection nozzle consists of the nozzle body the cone of which protrudes into the combustion chamber. The injection orifices through which the fuel is injected are bored in the nozzle cone. The number, configuration, length and diameter of these injection orifices permit the shape of the injection spray to be formed in a way that is ideally matched to the engine cylinder.

Inside the nozzle body is the nozzle needle which, when closed, blocks the injection orifices. For fuel injection, the nozzle needle is raised by the hydraulic servo system of the injector so that the injection orifices are opened. The faster the nozzle needle can be opened and re-closed, the more precisely the injection rate can be controlled.