| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem where an injection timing is sensitively changed, when the valve opening pressure of a needle is changed by changing an effective seat area of a nozzle by abrasion caused by strongly pressing the needle to the seat of a nozzle body, since a part where the valve opening pressure is changed, is a part where the pressure in a pressure control chamber is modestly changed in a conventional valve. SOLUTION: A flow rate adjusting pin 18 inserted into an outlet orifice 18 is mounted on a ball valve 23 for opening and closing the outlet orifice 18, and a flat part 28a is formed on a lower side of the flow rate adjusting pin 28. Whereby the lowering of the pressure of the pressure control chamber 16 is moderated until the lifting amount of the ball valve 23 reaches a predetermined lifting amount L, and the pressure of the pressure control chamber 16 is rapidly lowered, when the lifting amount becomes more than the predetermined lifting amount L. As the injection timing is set to the part where the pressure is rapidly lowered, the sensitive change of the injection timing is prevented even when the effective seat area of the nozzle is changed. COPYRIGHT: (C)2004,JPO
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