Electromagnetic valve apparatus
The force to draw an armature of an electromagnetic valve apparatus driving a valve for opening or closing a high-pressure liquid passage is increased and valve bouncing is alleviated by a surface of the core being flat and a surface of the armature facing the surface of the core being shaped convexly spherical. Interference of the surfaces is prevented by a smaller initial gap in a central portion of the faces, even when the armature is installed aslant due to insufficient accuracy of the component parts. Strong electromagnetic attraction can be secured because the smaller the gap is, the stronger the electromagnetic attraction.
1. An electromagnetic valve apparatus comprising:
an E-shaped core having an embedded coil;
an I-shaped armature located facing said core so as to be able to be driven by electromagnetic force;
wherein said E-shaped core has a surface facing said I-shaped armature, and said I-shaped armature has a surface located facing said surface of said E-shaped core with a small gap between said surface of said E-shaped core and said surface of said I-shaped armature;
wherein a gap width of said small gap between said surface of said E-shaped core and said surface of said I-shaped armature is smaller at central parts of said surface of said E-shaped core and said surface of said I-shaped armature than a gap width at peripheral parts of said surface of said E-shaped core and said surface of said I-shaped armature;
wherein said I-shaped armature has at least one passage hole therein that connects said small gap on one side of said I-shaped armature with a side of said I-shaped armature opposite to said one side so that fluid can flow between said sides; and
wherein said at least one passage hole has a tapered portion at one side thereof facing the surface of the E-shaped core, said one side is formed in a cone shape broadening toward the surface of the E-shaped core, and another side of said at least one passage hole opposite to the tapered portion of the passage hole is formed in a cylindrical shape.
2. The electromagnetic valve gear according to claim 1 , wherein said surface of said E-shaped core is shaped into a flat surface, and said surface of the I-shaped armature is shaped such that the central part thereof is a flat surface and an outer side of said surface from said flat surface is a convexly spherical or convexly ovally spherical surface connecting tangentially to the flat surface, or said surface of said I-shaped armature is shaped into a convexly spherical or convexly ovally spherical surface with the central part removed to be formed into a flat surface.