Patent ID: 7819344
Filing Date: 2010-10-26
Classification: F02M

Abstract:
1. An electromagnetic fuel injector, comprising: a valve member in which a seat part provided on a tip end thereof contacts a valve seat to close a fuel passage, and separates from the valve seat to open the fuel passage; an electromagnet provided as a drive for the valve member, and having a coil and a magnetic core; an anchor held by the valve member in a state of being relatively displaceable with respect to the valve member in a drive direction of the valve member; a housing which accommodates the anchor, the magnetic core being fixed on an inner peripheral side of the housing, the coil being fixed on an outer peripheral side of the housing; a first spring which biases the valve member in a direction opposite to a direction of a drive force by the drive; a second spring which biases the anchor in the direction of the drive force with a biasing load smaller than a biasing load of the first spring; and a restrictor configured to restrict relative displacement of the anchor with respect to the valve member in an axial direction of the valve member, the restrictor being arranged between only a side of the anchor facing the magnetic core and the valve member so as to allow the valve member to move independently relative to the anchor in the direction of the drive force, wherein the second spring is arranged between a spring seat provided in the housing to which the magnetic core and the coil are fixed so that the second spring and the anchor are located between the spring seat and the magnetic core within the housing.