| 摘要 |
A fuel injection system for an internal combustion engine has a fuel injection pump for controlling the amount of fuel injected in accordance with operating conditions of the engine, and a fuel injection nozzle unit for injecting the fuel delivered from the fuel injection pump into a combustion chamber. In the fuel injection nozzle unit, an injection pump chamber is located in a nozzle housing thereof so as to receive the fuel delivered from the fuel injection pump. The pressurized fuel in the fuel injection pump chamber is delivered by an injection plunger to an injection nozzle thereof. A pressure pump chamber is also located in the nozzle housing so as to receive a fluid. This fluid is pressurized by the pressurizing plunger which reciprocates in synchronism with the engine. The injection plunger pressurizes the fuel in the injection pump chamber by the pressure of the fuel in the pressure pump chamber, thereby supplying the pressurized fuel to an injection nozzle.
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