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Electromagnetic type fuel injector valve

  • US 6,834,844 B1
  • Filed: 09/13/2001
  • Issued: 12/28/2004
  • Est. Priority Date: 03/08/2000
  • Status: Expired due to Fees
First Claim
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1. A fuel injector having a valve driven by electromagnetic force, which injects fuel directly into a cylinder of an internal combustion engine, comprising:

  • a first coil in which a large excitation current flows for a short time during a beginning of a valve opening operation so as to substantially secure magnetomotive force necessary to open said valve;

    a second coil in which a relatively small excitation current flows so as to substantially secure magnetomotive force to hold the valve in an open state after said valve is opened; and

    a bobbin on which said first and second coils are wound;

    wherein said bobbin with said first and second coils is formed by a resin molding material having a heat conductivity between 1.0-3.0 W/mk, and wherein said first and second coils are arranged on an axial direction of said bobbin, a flange for partitioning between said first coil and said second coil is provided at the bobbin, and said flange extends to the inner surface of a yoke housing the first and second coils.

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