Electromagnetic valve

Abstract

The present invention is directed to an electromagnetic valve which includes a cylindrical fixed core, a spring which is mounted at a predetermined position within a hollow portion of the fixed core, a non-magnetic portion which is formed in the fixed core near the spring, and a valve seat member which is disposed at a position away from the predetermined position by a certain distance along a longitudinal axis of the fixed core. And, a movable core is disposed within the hollow portion of the fixed core between the valve seat member and the spring to be movable along the longitudinal axis of the fixed core. The movable core is provided with a stepped columnar portion having a small diameter section formed at its one end portion near the spring, and a large diameter section formed at its the other one end portion near the valve seat member, with a step formed at a boundary between the large diameter section and the small diameter section. The movable core is disposed so as to enable the step and one end portion of the small diameter section near the spring to contact with the inside wall of the hollow portion of the fixed core. And, a solenoid coil is provided for exciting the movable core and the fixed core.

Dependencies are inferred from the claim text.