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Solenoid driving device and solenoid valve

  • US 20050051748A1
  • Filed: 09/01/2004
  • Published: 03/10/2005
  • Est. Priority Date: 09/04/2003
  • Status: Active Grant
First Claim
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1. A solenoid driving device comprising:

  • a coil disposed on a bobbin formed of a non-magnetic material;

    end portions formed of a magnetic material which are disposed adjacent to both ends of said coil;

    a yoke formed of a magnetic material which is disposed encompassing said coil and said end portions; and

    a plunger disposed slidably in a hollow portion formed within said bobbin and end portions in the radial direction;

    said plunger comprising a base formed of a magnetic material, a first layer formed of a non-magnetic material which is disposed outside of said base in the radial direction, and a second layer formed of a non-magnetic material which has a friction coefficient smaller than that of said first layer and is disposed outside of said first layer in the radial direction.

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