| 摘要 |
PURPOSE: To obtain a compact structure by providing an injector for intermittently injecting fuel under high pressure in an internal combustion engine with an injector valve member, and controlling this valve by a fuel pressure in a control chamber acting on a valve piston. CONSTITUTION: An injector 10 is provided with an injector valve member 18. The movement of the valve member 18 to open and close a fuel discharge orifice 24 is controlled by a fuel pressure in a control chamber 40 acting on a valve piston 26 on a side opposite to the discharge orifice 24. A cylinder member 36 surrounds an upper part 30 of the valve piston 26. Energization of a solenoid 44 results in the opening of a pilot valve 46 and a subsequent quick drop of the fuel pressure in the control chamber 40. In addition to the function as a high speed actuator for the valve 46, the solenoid 44 is also used to carry and transmit the force generated by the fuel pressure in the control chamber 40 and acting on the member 36, the solenoid 44 and other members 48, 50, 52, 14. Consequently, the solenoid 44 can be mounted directly in the injector housing 14.
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