Patent ID: 6991188
Filing Date: 2006-01-31
Classification: B24B,F02M,Y10S

Abstract:
1. A fuel injection valve comprising: a substantially cylindrical valve casing in which a fuel flow passage is provided in its axial direction; a valve seat member comprising a valve seat installed within the fuel flow passage of one end of the cylindrical valve casing to enable a seating of a valve body and an injection outlet opening with a periphery of which the valve seat is enclosed, the valve body being disposed within the fuel flow passage of the valve casing to be operatively separated from the valve seat to open the fuel injection valve to inject the fuel in the fuel flow passage of the valve casing in response to an activation of an actuator; a nozzle plate faced against the injection outlet opening and on both surfaces of which openings of a plurality of nozzle holes are formed, the fuel being injected through the nozzle holes when the fuel injection valve is open; and a smoothly chamfered portion in a substantially arc shape of cross section formed on an edge of an inner wall portion of each opening end of the corresponding nozzle hole of the nozzle plate to further expand a whole diameter of an injection stream of fuel passed through the nozzle holes; wherein the dimension ratio between a hole diameter of each nozzle hole (d) at a substantially center of its corresponding nozzle hole and a radius of curvature of its corresponding arc-shaped chamfered portion (r) at the corresponding opening end is set to fall in a range from 1:0.1 to 1:0.28.