Patent ID: 7438238
Filing Date: 2008-10-21
Classification: F02D,F02M,Y02T

Abstract:
1. An injector for an internal combustion engine, the injector comprising: a nozzle that has an injection hole, through which high-pressure gaseous fuel is injected into a combustion chamber of the engine; a needle that is axially reciprocably received in the nozzle to open and close the injection hole of the nozzle, wherein: a control chamber for applying a pressure to the needle; a working fluid supply passage for supplying liquid fuel, which serves as a working fluid, to the control chamber; an electric switching valve for controlling an inflow of the liquid fuel to the control chamber and an outflow of the liquid fuel from the control chamber; a high-pressure gaseous fuel supply passage for supplying the high-pressure gaseous fuel to the injection hole; and a lubrication liquid fuel supply passage for supplying the liquid fuel, which serves as a lubrication, from the working fluid supply passage to the sliding portion and the valve portion of the needle, wherein: the sliding portion of the needle includes a glide portion; the nozzle includes a slide hole, which slidably receives the guide portion; the value portion of the needle includes a seating part; the lubrication liquid fuel supply passage, includes: wherein the second lubrication liquid fuel supply passage is constructed such that the first end of the second lubrication liquid fuel supply passage is communicated and discommunicated relative to the first lubrication liquid fuel supply passage through opening and closing the injection hole by the needle.