ELECTROMAGNETIC DRIVE TYPE FUEL INJECTION VALVE

摘要

PROBLEM TO BE SOLVED: To obtain an electromagnetic drive type fuel injection valve having excellent response by reducing generation of a liquid adhesion force between a fixed core and a movable core and preventing a collision surface from being magnetized. SOLUTION: The electromagnetic drive type fuel injection valve includes an annular collision surface of partly limited width formed on an annular end face of the movable core 10 which is magnetically attracted to the fixed core 1 having the annular end face. The collision surface is formed at a bore side from a center as seen in a radial direction of the annular end face of the movable core 10. A tapered surface is also formed at an inner peripheral side and an outer peripheral side of the annular collision surface. The annular end face of the movable core 10 is covered with a film of chromium including the annular collision surface. COPYRIGHT: (C)2005,JPO&NCIPI