Patent ID: 8451079

Claim:
An electromagnetic solenoid comprising: an electromagnetic coil forming an electromagnet when receiving electric power; a fixed iron core arranged at one end part of the electromagnetic coil, and magnetized when electric power is supplied to the electromagnetic coil; a movable iron core configured to be moved along the axial direction in the inside of the electromagnetic coil to and from the fixed iron core; a spring coil placed between the fixed iron core and the movable iron core and supplying a spring force to the movable iron core toward an opposite direction of the fixed iron core along the axial direction; a fitting part protruding from and having a maximum width perpendicular to the axial direction less than a maximum width of the at least one of the fixed iron core and the movable iron core in the same direction; and a magnetic attraction surface formed on a first surface of the at least one of the fixed iron core and the movable iron core facing the other iron core; wherein the magnetic attraction surface is contacted with the other iron core when the movable iron core is attracted to and in contact with the fixed iron core; the outer circumferential surface of the fitting part is in direct contact with the spring coil, and the maximum width of the magnetic attraction surface perpendicular to the axial direction is less than the maximum width of the fitting part in the same direction.