| 摘要 |
PURPOSE:To improve the response performance by making an electromagnetic selector valve for controlling the fuel pressure into small-sized, by varying the capacity inside a pressurizing chamber by an injection controller operated by the control pressure lower than the pressure in the pressurizing chamber. CONSTITUTION:When an electromagnetic selector valve 26 is in opened state, the fuel supplied from a fuel feeding pump 16 into a cylinder chamber 23 is returned into a fuel tank 27 through the electromagnetic selector valve 26. When a plunger 8 lowers in this state, and a fuel feeding port 15 is closed, and the plunger further lowers, and the pressurizing action for the fuel in a pressurizing chamber 11 is started, the plunger 20 shifts rightward with a piston 22 against the springy force of a compression spring 24, since the inside of the cylinder chamber 23 is not pressurized, and the capacity is increased, preventing the fuel in the pressurizing chamber 11 from being pressurized. Therefore, since the fuel pressure in the cylinder chamber 23 is low, it is enough for the electromagnetic selector valve 26 for controlling said fuel pressure to be small-sized.
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