| 摘要 |
PURPOSE:To increase the pressure of inside of a pump even during low load operation to aim at enhancing the combustibility of a Diesel-engine, by providing an accumulator communicated with a plunger chamber, and a discharge control valve disposed in an oil passage between the plunger chamber and a discharge valve. CONSTITUTION:A plunger 9 starts its ascent as a cam 5 rotates. A discharge valve push-rod 15 and an overflow valve push-rod 10 start to ascend simultaneously. At this time fuel in a plunger chamber 13 is compressed while the plunger 9 ascends, and the thus increased pressure of fuel is accumulated in an accumulator 3. When the plunger 9 further ascends, a discharge control valve 14 is opened to allow the accumulated high pressure oil to flow into a discharge valve 7. When the pressure becomes higher than the pressure of inside of a high pressure pipe line 2, the discharge valve 7 is pushed upward to allow fuel to be fed to a fuel valve 1 and to be injected. When the plunger ascends further more, an overflow valve 8 is opened, and therefore, high pressure oil in the plunger chamber 13 flows out as indicated by the arrow 21. Therefore, the discharge valve 7 is closed to terminate the fuel injection. |
