Patent ID: 6412713
Filing Date: 2002-07-02
Classification: F02D,F02M

Abstract:
A fuel injector, comprising:a valve member for opening and closing a fuel injection hole by leaving a valve seat and seating on the valve seat; a moving core provided integrally with the valve member, the moving core having an annular groove at an outer periphery thereof; a first fixed core facing one end of the moving core; a second fixed core facing the other end of the moving core; a tubular housing surrounding the moving core, the first fixed core, and the second fixed core, the tubular housing being made of magnetic material portions and nonmagnetic material portions disposed alternately in an axial direction, the nonmagnetic material portions being positioned around facing parts of the moving core and the first fixed core, around facing parts of the moving core and the second fixed core, and around the annular groove; a first coil, mounted at one end of the moving core, for magnetizing the first fixed core when the first coil is energized by an electrical current and attracting the moving core toward a valve opening direction; and a second coil, mounted at the other end of the moving core, for magnetizing the second fixed core and attracting the moving core toward a valve closing direction.