| 摘要 |
PURPOSE:To prevent incomplete sealing and malfunction upon seating of a needle valve, by making one of needle valves in slidable contact with the other one of the needles only in their base end parts so that the machining of the needle valves and the inner peripheral surface of a nozzle body is facilitated. CONSTITUTION:The front end conical surface of a nozzle body 1 is formed on its outer peripheral side with a plurality of first jet holes 2 and on its inner peripheral side with a plurality of second jet holes 3. Further, a first needle valve 9 is slidably fitted in the guide surfaces 7, 8 of the nozzle body 1 so that the base and front end parts 9a, 9b of the needle valve 9 provide an oil- tight measure, and is urged in the closing direction thereof by a first spring nozzle 12. Further, a second needle valve 14 is fitted in the inside of the first needle valve 9, and is urged in its closing direction by a second nozzle spring 20. Further, an oil sump section 22 is defined by the valves 9, 14 within the first needle valve 9, and is communicated with a fuel passage 23 through a communication hole 23.
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