| 摘要 |
PURPOSE:To inject fuel more smoothly by forming a ring-like exhaust passage having a V-shaped cross section and a cone-shaped basic end in the lower part on a valve box side, which is formed as a narrow passage, and moving both a sealing material and a movable nozzle to a fine exhaust passage forming position in an interlocking manner with a narrow passage forming edge. CONSTITUTION:When a non-fuel is to be injected, a seal material 4 comes to contact with the top 16U of a movable nozzle 3 at its neck 16 and blocks a branch hole 17S and closes a narrow passage forming edge 11 of an exhaust passage port 10 having a V-shaped cross section formed on a side of a valve box. During fuel injection, the seal material 4 is brought into contact with the bottom 16d of the neck 16 16 interlocking with the vertical movement of a movable nozzle 3 which is pushed by a fuel cylinder, and opens the branch hole 17a and holds a position which allows the formation of a fine exhaust passage 19 with the narrow passage forming edge 11 of the exhaust port 10. This construction makes it possible to exhaust air more smoothly and inject fuel more smoothly as well.
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