Patent ID: 7049916

Claim:
An electromagnetic apparatus comprising: an electromagnetic valve including an valve body having an inlet port and an outlet port for passing a fluid under pressure therethrough, and a housing; a solenoid having a coil disposed in said housing and wound around a coil bobbin, a yoke joined to an end of said housing, a fixed core, a movable core for being attracted to said fixed core when said coil is energized, and a spring member interposed between said fixed core and said movable core for returning said movable core to an initial position thereof; and a valve mechanism having a shaft joined to said movable core for displacement in unison with said movable core, and a valve element for selectively opening and closing a passageway between said inlet port and said outlet port in response to the displacement of said shaft; said moveable core having a nonmagnetic layer formed on an outer surface thereof and having a predetermined thickness, wherein said yoke has a tubular member and an annular flange, said tubular member surrounding an outer circumferential surface of said movable core and extending axially, said annular flange projecting radially outwardly from of said tubular member, and wherein said tubular member has an upper tubular segment extending from said annular flange toward said fixed core and a lower tubular segment extending from said annular flange toward said shaft.