| 摘要 |
In a fuel injection valve ( 1 ) having a nozzle body ( 31 ) with a nozzle hole ( 35 ) at its tip that is opened and closed by a nozzle needle ( 32 ) housed in the nozzle body ( 31 ), the area of contact between the nozzle needle ( 32 ) and a seat ( 31 A) on the nozzle body ( 31 ) is provided with a coating layer (Y) to reduce the frictional resistance with the nozzle body ( 31 ). When the nozzle needle ( 32 ) seats on the seat ( 31 A), between the time from when the tip of the nozzle needle ( 32 ) contacts the seat ( 31 A) to when it is pressed against the seat ( 31 A), the nozzle needle ( 32 ) slides on the surface of the nozzle body ( 31 ) with low frictional resistance. As a result, wear on the seat ( 31 A) when the nozzle needle ( 32 ) is seated to open the valve can be kept down.
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