Patent ID: 9022304
Filing Date: 2015-05-05
Classification: F02M

Abstract:
1. A fuel injection valve of a direct injection engine for directly injecting fuel containing gasoline into a cylinder of the engine, comprising: a valve body with a nozzle hole, facing inside the cylinder, formed at a tip thereof; a cylindrical case arranged inside the valve body and forming a fuel passage by an inner circumferential surface of the case; a cylindrical fixed core having a fitting portion fixed to the inner circumferential surface of the cylindrical case, so that a fuel pressure acts on portions of the fixed core other than the fitting portion of the fixed core; a needle body provided inside the fixed core for opening and closing the nozzle hole, configured to be moved in a cylinder axial direction by at least one movable core; the at least one movable core movably provided inside the case in the cylinder axial direction and for driving the needle body to open and close, so that the needle body is movably provided inside the fixed core; a solenoid coil arranged inside the valve body and outside the case and configured for attracting the at least one movable core by forming a magnetic circuit over the inside and outside of the case when power is supplied to the solenoid coil, so that the needle body opens the nozzle hole; and a reinforcing member arranged inside the valve body and fitted externally onto the case, wherein a maximum fuel pressure inside the fuel passage is set to a high fuel pressure of 40 MPa or above.