Patent ID: 7552908
Filing Date: 2009-06-30
Classification: F02M,F16K,H01F

Abstract:
1. A solenoid drive apparatus for driving a driven member by a magnetic attractive force, the solenoid drive apparatus comprising: a tubular magnetic metallic body that has an opening portion at one end; a coil that is received in the body from the opening portion and provides a magnetic field when the coil is energized; a magnetic metallic plate that closes the opening portion of the body; a magnetic gasket that is held between the body and the plate, wherein the magnetic gasket is made of steel; an armature, wherein the magnetic field is formed at the body, the plate, the gasket, and the armature when the coil is energized; and an elastic member that is provided on a surface of the gasket, the elastic member having lower hardness than the gasket, wherein the body includes a body end surface at one side of the body, the one side facing the opening portion; the plate includes a plate end surface that faces the body end surface; the gasket has a flat annular shape and is held between the body end surface and the plate end surface; the elastic member has a first thickness dimension in a magnetic-field direction, in which the magnetic field is formed through the elastic member; the magnetic gasket has a second thickness dimension in the magnetic-field direction; and the first thickness dimension is smaller than the second thickness dimension.