Patent ID: 6547215
Filing Date: 2003-04-15
Classification: F16K,Y10T

Abstract:
An electromagnetic device, comprising:a moving core made of magnetic material; a stator core having a container portion, a thin wall portion and an attraction portion, the container portion, the thin wall portion and the attraction portion being formed integrally with a continuous magnetic material, the container portion containing and supporting said moving core therein, said moving core being movably supported in a reciprocating direction, the attraction portion defining a stopper facing an axial end surface of the moving core contained in the container portion and magnetically attracting said moving core in the reciprocating direction of said moving core, and the thin wall portion being provided as a magnetic resistor between the container portion and the attraction portion for magnetically partitioning therebetween; a coil disposed on an outside of the container portion, the coil being electrically energized to generate a magnetic force for attracting said moving core toward said attraction portion; and a cylindrical cup-shaped nonmagnetic member attached on said moving core so as to be movable therewith, the cylindrical cup-shaped nonmagnetic member covering said axial end surface of said moving core facing the stopper, an entire outside surface of said moving core which faces an inner surface of said container portion, and a edge between said axial end surface and said outside surface.