Smc Corporation

Masanori Kaizuka

Hideyuki Takada

Hideaki Tanaka

Ryushiro Kaneko

To provide an electromagnetic actuator, having a large stroke and capable of producing the maximum thrust at a retreated stroke end, which is simple in structure and easy to manufacture. The electromagnetic actuator comprises an electromagnetic coil,, a magnetic frame,arranged on the periphery thereof, a movable iron core,slidable in a central hole,of the coil,, a first sleeve,coupled with the magnetic frame,at one end side of the central hole,of the coil, and a second sleeve,coupled with the magnetic frame,at the other end side of the central hole,. The second sleeve,is spaced from the first sleeve,with a space (A&plus;C) in the axial direction, and has an end thereof opposing the first sleeve,extended to a position in close proximity to the movable iron core,when the movable iron core,is at the retreated stroke end, but without being substantially fitted thereon, and extended to a position apart therefrom by a micro-distance A.

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Tsukuba-gun, Japan

Masanori Kaizuka