| 摘要 |
PURPOSE:To make the precise determination of injection time possible by the simple composition of a fuel injection device by communicating a pressure relief fuel breathing chamber with the valve closing pressure fuel chamber of a fuel injector individually through the pressure relief passage of a pressure relief valve for determining injection time and a fuel return passage. CONSTITUTION:A pressure relief fuel breathing chamber 21 communicates with the valve closing pressure fuel chamber 85 of a fuel injector 29 individually through the pressure relief passages 59 for pressure relief valve 19 for determining injection time and a fuel return passage 22 to timingly interlock the pressure relief valve 19 with a crankshaft. The passages 59 causes the fuel chamber 85 to communicate with the fuel breathing chamber 21 during fuel injection, and the fuel in the fuel chamber 85 is therefore set free into the fuel breathing chamber 21 to reduce internal pressure in the fuel chamber 85. Thus since the injection time is determined in dependence of the valve opening time of the pressure relief valve 19 opened and closed with timing control made on the crankshaft, the injection time can be simply and precisely determined. In addition to that, the fuel return passage 22 causes the fuel breathing chamber 21 to communicate with the fuel chamber 85 after the fuel injection to discharge back the fuel in the fuel breathing chamber 21 into the fuel chamber 85. |
