Patent ID: 6542059
Filing Date: 2003-04-01
Classification: F16K

Abstract:
A solenoid for an electromagnetic valve which is mounted to an electromagnetic valve to drive a valve member for switching flow paths, the solenoid comprising:a bobbin made from a non-magnetic body, which has an iron core hole extending in an axial direction and which has a coil wound on an outer periphery thereof; a magnetic body case which covers a side face of the bobbin and one end face thereof in the axial direction; an annular magnetic body plate coupled to the magnetic body case on the side of the other end face of the bobbin; a movable iron core which is received movably in the iron core hole of the bobbin; a fixed magnetic pole member which attracts the movable iron core; and a return spring which biases the movable iron core in a direction of separating from the fixed magnetic pole member, wherein: the movable iron core has a main body portion with an even section fitted into the iron core hole, and a flange portion with an even section formed on a portion extending from the iron core hole of the main body distal end, a ring is fixedly fitted on an outer periphery of the distal end of the movable iron core at a position where it spans over the main body portion and the flange portion, and the ring has a first portion which is positioned on a distal end side and which has a large diameter in which the flange portion is fitted and a second portion which is positioned on a proximal end side and which has a small diameter in which the main body portion is fitted.