| 摘要 |
PURPOSE:To obtain engine operation without any malfunction by installing a working oil supply system, which operates a servo piston for an injector plunger, separately from a fuel feeding system, which is provided with an independent fuel flow rate control mechanism. CONSTITUTION:An injector, in which a spool valve 26 is inserted into a spool valve chamber 23 within an injector body 13, lowers the valve 26 via a core 28 when a solenoid coil 8 is magnetized. A changeover valve 41, which is inserted into a changeover valve chamber 19 that is connected to a valve chamber 23 via a fuel passage 17', is energized downward by a spring 42. Working oil, which is supplied from a working oil supply system via an oil passage 12 and a flow inlet 14 by opening the changeover valve 41, is introduced into a servo pistion chamber 46 to lower a servo pistion 50. With this contrivance, fuel, which has been supplied from a fuel feeding system to a fuel passage 54 via a fuel control system S2b, a fuel passage 12b, and a flow inlet 14a, is pressurized to push up a needle 36, thereby being injected from a nozzle 55. |
