Patent ID: 7775464

Claim:
An electromagnetic fuel injection valve comprising: a valve housing which includes: a valve seat member having a valve hole at a front end thereof, and a valve seat leading to an inner end of the valve hole; a magnetic cylinder connected to a rear end of the valve seat member; and a stationary core connected to a rear end of the magnetic cylinder via a nonmagnetic collar abutting the rear end of the magnetic cylinder; a valve element housed in the valve seat member so as to open and close the valve hole in cooperation with the valve seat; a movable core housed in the magnetic cylinder, the movable core being connected to the valve element and facing a front end of the stationary core; a coil housing fittingly fixed to an outer periphery of the magnetic cylinder, and housing a coil assembly provided in an outer periphery of the stationary core, wherein the coil housing includes: a shell part surrounding the coil housing; an annular bent part bent radially inward from a front end of the shell part; and a cylindrical boss part projecting forward from a front end of the annular bent part; wherein an inner peripheral surface of the annular bent part and an inner peripheral surface of at least a rear half part of the boss part are shrinkage-fitted to an outer peripheral surface of the magnetic cylinder; and wherein a positioning flange is integrally formed in the magnetic cylinder so as to receive a front end of the boss part and define a fitting depth between the coil housing and the magnetic cylinder.