Solenoid and method for manufacturing same

A solenoid comprising:

• a yoke having a U-shaped cross section;
• a bobbin having an electromagnetic coil disposed inside the yoke;
• a fixed iron core disposed inside the bobbin;
• and
• a flapper attached to the yoke to be able to swing freely, wherein
• the fixed iron core and a bottom surface of the yoke are integrally coupled by threaded fitting,
• a thread groove of at least one of an external thread and an internal threaded fitted together by the threaded fitting includes, on a surface thereof, an adhesive layer configured by a microcapsule encapsulating an adhesive component, and
• a hole of a required size is formed in a center portion of a top portion of the fixed iron core.

A method for manufacturing a flapper-type solenoid, comprising:

• inserting a fixed iron core, including a hole of a required size being formed in a center portion of a top portion of the fixed iron core, into a bobbin, after installing the bobbin including an electromagnetic coil inside a yoke having a U-shaped cross section;
• and
• causing the fixed iron core threaded fitting with a bottom surface of the yoke, wherein
• a thread groove of at least one of an external thread and an internal thread fitted together by the threaded fitting includes, on a surface thereof, an adhesive layer configured by a microcapsule encapsulating an adhesive component.