| 摘要 |
A fuel injection nozzle equipped with an injection hole (14), a cylindrical nozzle body (3), the tip end of which has a suction chamber (15) formed therein to which the intake port (21) of the injection hole opens, and a needle (2) housed inside the nozzle body so as to be capable of moving in the axial direction, wherein the needle moves in the axial direction so as to be seated on and unseated from the inner wall (16) of the nozzle body, and as a result, fuel injection starts and stops. The fuel injection nozzle is further equipped with a hole (5) that is provided in the tip end (12) of the needle and recesses toward the rear-end side in the axial direction, and a tip-end component (6) that projects into the suction chamber and is slidably held on the inner-circumferential surface of the hole. The tip-end component has a sliding part (51) for sliding on and contacting the inner-circumferential surface of the hole, and a narrow part (52) that is provided on the tip-end side of the sliding part (51) in the axial direction and is narrower than is the sliding part (51), as a result of constriction toward the inside in the radial direction. Even when the needle moves in the axial direction, the tip-end component continues to contact the floor surface (24) of the suction chamber, and the narrow part always maintains the same position within the suction chamber. |
