| 摘要 |
In a pressure accumulation type of fuel injection device for an internal combustion engine, including a fuel injector which is adapted to temporarily store each incoming charge of highly pressurized fuel and inject the fuel under high pressure, a nozzle valve is provided within the pressure accumulation chamber defined in the fuel injector body. The upper end portion of the nozzle valve stem extends hermetically and slidably through a bore formed in the fuel injector body. Furthermore, a cylindrical check valve is provided so as to encircle the valve stem and is adapted to be biased towards an underside of an annular projection formed on the valve stem by a check valve spring mounted on the valve stem to close the check valve. The spring force for closing the check valve which controls the opening and the closing of the inlet portion of the pressure accumulation chamber is reduced and the pressure of the fuel stored in the pressure accumulation chamber can be increased greatly. The fuel injection timing can thereby be controlled more accurately. |
