| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection device which has a command piston reciprocating inside a body holding a nozzle body and directly or indirectly moving a nozzle needle and prevents excessive force applied to nozzle seat parts of the nozzle needle and the nozzle body. SOLUTION: This fuel injection device is provided with the nozzle body 11 having a nozzle hole 41, the nozzle needle 31 opening/closing the nozzle hole 41 by reciprocating inside the nozzle body 11, the body 50 holding the nozzle body, and the command piston 60 reciprocating inside the body 50 and directly or indirectly moving the nozzle needle 31. Drive force acting on the command piston 60 is applied to the nozzle seat parts 13, 36 in which the nozzle needle 31 is seated on the nozzle body 11. The fuel injection device is further provided with drive force dispersion means 11a, 91 for dispersing drive force into portions other than the nozzle seat parts 31, 36, when amount of elastic deformation by which the nozzle needle 31 is relatively sink to the nozzle body 11 exceeds predetermined amount L, at the time of seating. COPYRIGHT: (C)2005,JPO&NCIPI
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