| 摘要 |
PURPOSE:To enable the adoption of a compact solenoid valve of low cost and the sure control of a small injected quantity, by connecting a pump chamber and a plunger pressurization chamber to each other through two fuel passages, and providing one fuel passage with the solenoid valve, which is opened at the end of injection. CONSTITUTION:A plunger 6 begins to move rightward during the closure of a solenoid valve 50 as a drive shaft 3 is rotated. When the plunger has reached a prescribed injection start position at a prescribed lift, a pre-cut port 34 and an annular groove 38, which constitute a first fuel passage, are disconnected from each other, the pressure of fuel in a pressurization chamber 33 is heightened, and the injection of the fuel is started. When the supply of electricity to the solenoid valve 50 is stopped and a valve element 53 is opened by the pressure in the pressurization chamber 33 and a spring 59, the fuel in the chamber is caused to overflow into a pump chamber 5 through a second fuel passage 37, 44, 43 so that the injection of the fuel is terminated. The solenoid valve 50 is kept open until the suction stroke of the plunger 6 for injecting the fuel into a next cylinder ends. |
