FUEL INJECTION VALVE

摘要

The purpose of the present invention is to provide a fuel injection valve that uses swirl flow wherein atomization performance is increased by improving speed distribution uniformity in a fuel flow channel. In order to solve the above mentioned problem this fuel injection valve has a swirl chamber having an inner peripheral wall formed so that the curvature gradually increases from the upstream side toward the downstream side swirling passages (21a-d) for introducing fuel into the swirl chamber and a fuel injection hole opening into the swirl chamber. A fuel flow channel is formed by the swirling passages (21a-d) of an orifice plate (20) the orifice plate (20) in which the swirl chamber and the fuel injection hole are formed and an opening (5) provided to the bottom surface of a nozzle member (2) in contact with the top surface of the orifice plate (20). Notches (31) for communicating the opening (5) and the swirling passages (21a-d) are provided to the bottom surface of the nozzle member (2) in contact with the top surface of the orifice plate (20).