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Electromagnetic fuel injector

  • US 5,012,982 A
  • Filed: 06/05/1989
  • Issued: 05/07/1991
  • Est. Priority Date: 11/15/1986
  • Status: Expired due to Term
First Claim
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1. An electromagnetic fuel injector comprising a cylindrical yoke opened at its respective ends;

  • a cylindrical core made of magnetic material connected with one end of said yoke and having a distal end extending into said yoke;

    an electromagnetic coil supported between said core and said yoke;

    a valve guide fixed in the other end of the yoke and including a guide part for a ball valve located at a position remote from said electromagnetic coil;

    an elongated movable member with a ball valve provided at one end and an armature made of a magnetic material provided at the other end thereof;

    said elongated moveable member being disposed in such a manner that the distal end of said cylindrical core opposes said armature and said ball valve is disposed adjacent said guide part remote from said electromagnetic coil;

    said electromagnetic coil being disposed around said cylindrical core for producing an electromagnetic force between said cylindrical core and said armature when said coil is energized to effect axial movement of said elongated moveable member; and

    a guide member for guiding the movement of said elongated movable member in the axial direction and being disposed in the vicinity of said armature of said elongated movable member, said guide member provided in the vicinity of said armature of said elongated movable member being composed of a hollow sliding member made of an on-magnetic material disposed between and engaging with said armature and the distal end of said core so that magnetic flux from said electromagnetic coil does not pass therethrough; and

    wherein a sliding surface of the sliding member and an open inner wall surface of the yoke to which the valve guide is fixed are precisely coaxial.

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