| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve with little carbon deposit. SOLUTION: The fuel injection valve comprises a valve seat, which has a valve seat surface forming a tapered flow-path and a cylindrical nozzle, and a valve body having a spherical portion and a conical projection, which are separated from and brought in contact with the valve seat surface. The projection is designed to make the cross sectional area of an annular flow-path between the valve seat surface and the valve body substantially constant along the flowing direction of a fuel to suppress the flow rate variation of the fuel. The conical shape of the projection is larger in diameter than the nozzle. The valve seat surface is formed in a two-staged conical shape. The projection is substantially spherical at the tip end portion thereof. The projection comprises at the tip end portion thereof a cylindrical portion, which is substantially equal in diameter to the maximum diameter of a cavity in the fuel flow formed in the fuel nozzle. COPYRIGHT: (C)2004,JPO&NCIPI
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