| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve which surely supplies an amount of fuel necessary for injection while reducing a temporal change of a fuel injection amount to an injection hole.SOLUTION: A needle 40 has a first seal part 41 arranged at an end of an injection hole 310 side, and a second seal part 42 arranged at a fixed core side of the first seal part 41. When a boundary 400 between a first outer wall 411 of the seal part 41 and a second outer wall 421 of the second seal part 42 and an inner wall 322 separate from each other or abut on each other, the injection hole 310 is opened and closed. By this constitution, a sheet diameter between the boundary 400 and an inner wall 322 is stabilized, and a temporal change of a fuel injection amount can be reduced. The first outer wall 411 of the first seal part 41 is formed into a spherical shape. Therefore, since a clearance between the first outer wall 411 and the inner wall 322 becomes wide compared with the case that the first outer wall is formed into a tapered shape, an amount of fuel which is necessary for injection from the injection hole 310 can be surely supplied to a sack 313.SELECTED DRAWING: Figure 2 |
