Patent ID: 8456262

Claim:
An electromagnetic solenoid comprising: a coil which generates magnetic force by energization; a cylindrical yoke covering an outer circumference of the coil and extending in an axial direction of the coil; first and second stators which are arranged around the coil to configure a magnetic circuit around the coil together with the yoke, the first and second stators being magnetized by the energization of the coil to configure an electromagnet; a plunger guide arranged radially inward of the first and second stators; and a plunger inserted into the plunger guide to be slidably movable in the axial direction of the coil and to be attracted by magnetic force of the electromagnet, wherein the first stator is arranged at one end side of the coil in the axial direction of the coil, and the second stator is arranged at the other end side of the coil in the axial direction of the coil, the first stator includes: an annular radial core part arranged perpendicularly to the axial direction of the coil and extending in a radial direction of the coil; an axial core part cylindrically extending from an inner diametrical end of the radial core part toward the second stator at a position radially inward of the coil; and a core corner part provided at an intersection portion of the radial core part and the axial core part, and having an of outer corner surface, the plunger guide includes: a cylindrical sleeve which is arranged radially inward of the first and second stators and extends in the axial direction of the coil to hold the plunger slidably; a flange which extends radially outward from an end part of the cylindrical sleeve and is located at a side of the radial core part of the first stator opposed to the coil in the axial direction of the coil; and a plunger-guide corner part provided at an intersection portion of the cylindrical sleeve and the flange, and having an inner corner surface, and the outer corner surface of the core corner part and the inner corner surface of the plunger-guide corner part abut on each other in a circular contact portion linearly or in area along an entire circumference; wherein an inner circumferential surface of the yoke has a step surface that is opposed to a surface of the radial core part on a side of the coil in the axial direction of the coil, the step surface and the surface of the radial core part hold a magnetic member therebetween, and the yoke and the radial core part are magnetically coupled with each other through the magnetic member.