JP2006279001A - Electromagnet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance an attracting force by which a movable iron core is attracted by a fixed iron core when a coil is energized at the position where the movable iron core is farthest from the fixed iron core with no increase in size. <P>SOLUTION: In a fixed iron core 1, a first beveled ridge 23 is formed on an outer peripheral surface 3B side of an annular hole 3, a second beveled ridge 24 is formed on an inner peripheral surface 3C side of the annular hole 3, a third beveled ridge 25 is form on the outer peripheral surface 15B side of the protrusion 15 of the movable iron core 13, and a fourth beveled ridge 26 is formed on the inner peripheral surface 15C side of the protrusion 13. Relating to the protrusion 15, the third beveled ridge 25 and the first beveled ridge 23 are positioned almost axially agreed with each other while the fourth beveled ridge 26 and the second beveled ridge 24 are positioned almost axially agreed with each other, at the position of the movable iron core 13 farthest from the fixed iron core 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnet in which a movable iron core moves in the axial direction by an attractive force generated by energization and is attracted to a fixed iron core.

This type of electromagnet opens to one end surface in the axial direction in a fixed iron core to form a bottomed annular hole, and provides an outer cylinder part on the outer peripheral side of the annular hole, and an inner cylinder part on the inner peripheral side of the annular hole. And mounting the annular coil in the annular hole so as to contact the bottom surface of the annular hole, and providing the outer cylinder part and the inner cylinder part of the fixed core longer in the axial direction than the coil. An annular space is formed at the tip of the coil. The movable iron core includes a movable iron core that is movably disposed facing the fixed iron core in an axial direction and is attracted to one end surface of the fixed iron core by a suction force generated by energizing the coil. An annular convex portion to be fitted is formed so as to protrude in the axial direction toward the fixed iron core to increase the suction force.
JP-A-2001-289018 (paragraph numbers 0042-0044, 0062, FIG. 5)

  However, in such a conventional electromagnet, the convex portion is separated from the annular gap at the position where the movable core is farthest from the fixed core, and there is still a problem that it is difficult to obtain a satisfactory attractive force.

  The subject of this invention is providing the electromagnet which raises the attraction | suction force by which a movable iron core is attracted | sucked to a fixed iron core by the electricity supply to a coil in the position which the movable iron core was most spaced apart from the fixed iron core, without enlarging.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In an electromagnet that moves the moving iron core in the axial direction by the attractive force generated by energizing the coil and attracts it to the fixed iron core, the fixed iron core opens to one end surface in the axial direction to form an annular hole, and the outer circumference of the annular hole An outer cylinder portion is provided on the side, an inner cylinder portion is provided on the inner peripheral side of the annular hole, and the first ridge portion is formed by intersecting the outer peripheral surface of the annular hole and one end surface in the axial direction of the outer cylindrical portion. A second ridge is formed by intersecting the inner peripheral surface of the annular hole and one axial end surface of the inner cylindrical portion, and an annular coil is accommodated in the annular hole, and the inner cylindrical portion of the fixed iron core is connected to the inner cylindrical portion. An annular space is formed at the tip of the coil with the cylindrical portion, and is arranged so as to be movably opposed to the fixed core in the axial direction, and is attracted to one end surface of the fixed core by the suction force generated by energizing the coil. A movable iron core is provided, and the movable iron core has an annular convex part that fits into the annular space of the fixed iron core facing the fixed iron core in the axial direction from one end surface. The convex portion is formed with a third ridge portion by intersecting the outer peripheral surface and the protruding tip surface, and the fourth ridge portion is formed by intersecting the inner peripheral surface and the tip surface. The electromagnet is characterized in that the third ridge portion and the fourth ridge portion substantially coincide with the second ridge portion in the axial direction at a position where the movable iron core is farthest from the fixed core. That is it.

  In this case, a first chamfer is formed on the first ridge, a second chamfer is formed on the second ridge, a third chamfer is formed on the third ridge, and a fourth chamfer is formed on the fourth ridge. The first chamfer and the outer peripheral surface of the annular hole intersect each other to form a first chamfered ridge, the second chamfer and the inner peripheral surface of the annular hole intersect, and a second chamfer ridge. The chamfer and the outer peripheral surface of the convex portion intersect to form a third chamfered ridge portion, the fourth chamfer and the inner peripheral surface of the convex portion intersect to form a fourth chamfered ridge portion, and the convex portion Is a position in which the third chamfered ridge portion and the fourth chamfered ridge portion substantially coincide with the second chamfered ridge portion in the axial direction at a position where the movable iron core is farthest from the fixed iron core. May be provided.

  As described above in detail, the invention according to claim 1 is configured such that the first ridge portion, the third ridge portion, the second ridge portion, and the fourth ridge portion are respectively axised at the position where the movable iron core is farthest from the fixed iron core. Since the first ridge part and the third ridge part and the second ridge part and the fourth ridge part can be brought close to each other, the first ridge part is located between the fixed iron core and the movable iron core. And the third ridge part and the second ridge part and the fourth ridge part, the magnetic flux can easily flow, and the movable iron core is attracted to the fixed iron core by energizing the coil. It can be raised at the most distant position.

  In the invention according to claim 2, the first chamfered ridge portion, the third chamfered ridge portion, the second chamfered ridge portion, and the fourth chamfered ridge portion are respectively axially arranged at a position where the movable iron core is farthest from the fixed core. Therefore, the first chamfered ridge portion, the third chamfered ridge portion, the second chamfered ridge portion, and the fourth chamfered ridge portion can be brought close to each other. The magnetic flux can easily flow through the one chamfered ridge portion, the third chamfered ridge portion, the second chamfered ridge portion, and the fourth chamfered ridge portion, and is movable by energizing the coil as in the invention of claim 1. The suction force by which the iron core is attracted to the fixed iron core can be increased at a position where the movable iron core is farthest from the fixed iron core. Moreover, in addition to the effect of the invention according to claim 1, the invention according to claim 2 forms the first to fourth chamfers at the first to fourth ridges, respectively. When manufacturing or processing a convex portion or the like, it is possible to satisfactorily remove a microprotrusion called a splinter that protrudes from each ridge and may adversely affect its function.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a fixed iron core made of a magnetic material, which penetrates in the axial direction at the center to form a through hole 2 and has a bottomed annular hole 3 that coincides with the through hole 2 and the axial center. The annular hole 3 is formed in a hollow by opening at one end face 4 in the axial direction below the figure. The fixed iron core 1 is provided with an outer cylindrical portion 5 on the outer peripheral side of the annular hole 3 and an inner cylindrical portion 6 on the inner peripheral side of the annular hole 3. A coil 7 is electrically connected to an external power source (not shown) so as to be energized, and is formed in an annular shape by being wound between both flange portions of a cylindrical coil bobbin 8 having flange portions protruding radially at both ends in the axial direction. It is accommodated in the annular hole 3 so as to contact the bottom surface 3 </ b> A of the hole 3. 9 is an annular retaining ring with a part cut in the circumferential direction so as to expand its diameter by its own elastic force, and is provided in pressure contact with the annular groove 10 formed in the outer peripheral surface 3B of the annular hole 3 by its own elastic force. The coil 7 housed in the annular hole 3 is fixed via a disk-shaped plate member 11 formed of a nonmagnetic material. The outer cylinder part 5 and the inner cylinder part 6 of the fixed iron core 1 are provided with an axial dimension longer than the axial dimension of the coil 7 including the retaining ring 9 and the plate member 11, and between the outer cylinder part 5 and the inner cylinder part 6. Thus, an annular space 12 is formed at the tip of the coil 7.

  Reference numeral 13 denotes a movable iron core made of a magnetic material. The shaft portion 13A is slidably fitted into a bottomed hole 14A formed in a lid member 14 made of a nonmagnetic material welded and fixed to the fixed iron core 1 to be fixed. The iron core 1 and the shaft center are aligned and movably disposed in the lid member 14, and the fixed iron core 1 and the shaft are attracted to one end surface 4 in the axial direction of the fixed iron core 1 by the suction force generated by energizing the coil 7. It is provided facing the direction. The movable iron core 13 is set at the position shown in the right half of FIG. 1 that is farthest from the fixed iron core 1 by contacting the bottom surface of the bottomed hole 14A with the tip of the shaft portion 13A. Reference numeral 15 denotes an annular protrusion formed so as to protrude in the axial direction from the one end surface 16 of the movable iron core 13 facing the one end surface 4 of the fixed iron core 1 toward the fixed iron core 1. The fitting gap with the space 12 is made larger than the fitting gap between the shaft portion 13A and the bottomed hole 14A. 17 is a spacer ring made of a non-magnetic material and is provided on the movable core 13 so as to slightly protrude in the axial direction from the one end face 16. When the movable core 13 is attracted to the fixed core 1 by energizing the coil 7, When the one end surface 16 of the movable iron core 13 is in contact with the one end surface 4 in the axial direction and prevents the one end surface 16 of the movable core 13 from coming into direct contact with the one end surface 4 in the axial direction of the fixed core 1 to reduce the residual magnetic force. The responsiveness that the movable iron core 13 is separated from the fixed iron core 1 is improved. Reference numeral 18 denotes a pin member fixed to the movable iron core 13. The pin member is inserted through the through hole 2 of the fixed iron core 1 and protrudes one end to the outside, and an external load (not shown) separates the movable iron core 13 from the fixed iron core 1 at the protruded one end. It is acting on.

  As shown in FIGS. 2 to 4, reference numeral 19 denotes a first chamfer formed on a first ridge 19 </ b> A where the outer peripheral surface 3 </ b> B of the annular hole 3 intersects one end surface 4 of the outer cylinder part 5, and 20 denotes an inner part of the annular hole 3. A second chamfer formed on the second ridge portion 20A where the peripheral surface 3C and the one end surface 4 of the inner cylinder portion 6 intersect, 21 is an outer peripheral surface 15B of the convex portion 15 formed on the movable iron core 13, and a protruding end surface 15A. 3 is a third chamfer formed on the third ridge 21A where the two intersect, and 22 is a fourth chamfer formed on the fourth ridge 22A where the inner peripheral surface 15C of the convex portion 15 intersects the tip surface 15A. When the convex portion 15 and the like are manufactured and processed, it is intended to remove minute protrusions called burrs that are formed on the respective ridge portions 19A, 20A, 21A, and 22A and may adversely affect the function. Each chamfer 19, 20, 21, and 22 has substantially the same chamfer dimension.

  Reference numeral 23 denotes a first chamfered ridge formed by intersecting the first chamfer 19 and the outer peripheral surface 3B of the annular hole 3, and reference numeral 24 denotes a second chamfer formed by intersecting the second chamfer 20 and the inner peripheral surface 3C of the annular hole 3. 2 chamfered ridges, 25 is a third chamfered ridge formed by intersecting the third chamfer 21 and the outer peripheral surface 15B of the convex portion 15, and 26 is a fourth chamfer 22 intersecting the inner peripheral surface 15C of the convex portion 15. The fourth chamfered ridge formed. The convex portion 15 has a third chamfered ridge portion 25 at a position where the movable iron core 13 is farthest from the fixed iron core 1 (indicated by a separation dimension R between one end face 16 of the movable iron core 13 and one end face 4 of the fixed iron core 1). The first chamfered ridge portion 23 and the fourth chamfered ridge portion 26 are provided at positions that substantially coincide with the second chamfered ridge portion 24 in the axial direction. That is, the dimension H of the convex portion 15 protruding in the axial direction between the one end face 16 of the movable iron core 13 and the third chamfered ridge 25 and the fourth chamfered ridge 26 is set to the separation dimension R and the chamfer of the first chamfer 19. The dimension C1 or the chamfer dimension C2 of the second chamfer 20 is added to approximately the same dimension.

Next, the operation of this configuration will be described.
The state of the right half of FIG. 1 shows a non-energized state of the coil 7, and the movable iron core 13 is urged in a direction away from the fixed iron core 1 by an acting force based on an external load (not shown) acting on the pin member 18. The tip end surface of the shaft portion 13A is at a position farthest from the fixed iron core 1 in contact with the bottom surface of the bottomed hole 14A.

  When the coil 7 is energized in the state of the right half of FIG. 1, the movable iron core 13 is attracted to the fixed iron core 1 against the acting force based on an external load (not shown) by the attraction force generated by the energization, and moves upward in the figure. The spacer ring 17 stops at the position shown in the left half of FIG. 1 where the spacer ring 17 contacts the one axial end surface 4 of the fixed iron core 1.

  At the position shown in the left half of FIG. 1, the value of the current supplied to the coil 7 is reduced and the movable iron core 13 is held in position. In this state, when the coil 7 is deenergized, the movable iron core 13 moves downward in the figure by an acting force based on an external load (not shown), returns to the position shown in the right half of FIG.

    With such an operation, the first chamfered ridge portion 23, the third chamfered ridge portion 25, the second chamfered ridge portion 24, and the fourth chamfered ridge portion 26 are respectively axially positioned at a position where the movable core 13 is farthest from the fixed core 1. Since the first chamfered ridge portion 23 and the third chamfered ridge portion 25 and the second chamfered ridge portion 24 and the fourth chamfered ridge portion 26 can be brought close to each other, the fixed iron core 1 and the movable iron core 13 can be located. The magnetic flux can easily flow through the first chamfered ridge portion 23, the third chamfered ridge portion 25, the second chamfered ridge portion 24, and the fourth chamfered ridge portion 26. The suction force at which 13 is attracted to the fixed iron core 1 can be increased at a position where the movable iron core 13 is farthest from the fixed iron core 1.

  Further, since the first to fourth chamfers 19, 20, 21, and 22 are formed on the first to fourth ridges 19A, 20A, 21A, and 22A, respectively, the annular hole 3 and the convex portion 15 are formed. When manufacturing and processing, it is assumed that minute protrusions called “bursts” that have been formed to protrude from the first to fourth ridges 19A, 20A, 21A, and 22A and may adversely affect the function are well removed. be able to.

  In the embodiment, the first to fourth chamfers 19, 20, 21, and 22 are formed on the first to fourth ridges 19 </ b> A, 20 </ b> A, 21 </ b> A, and 22 </ b> A, respectively. Of course, it is not necessary to form chamfers 19, 20, 21, and 22 on 21A and 22A. In this case, the convex portion 15 substantially coincides with the third ridge portion 21A, the first ridge portion 19A, and the fourth ridge portion 22A in the second ridge portion 20A in the axial direction at the position where the movable core 13 is farthest from the fixed core 1. It is provided at a position where Further, although the chamfer dimensions of the chamfers 19, 20, 21, and 22 are provided substantially the same, it is needless to say that the chamfer dimensions of the chamfers 19, 20, 21, and 22 may be provided differently.

  Now, as shown in FIG. 5, the distance R between the one end surface 16 of the movable core 13 and the one end surface 4 of the fixed core 1 at a position where the movable core 13 is farthest from the fixed core 1 is 1.1 mm. The dimension H of the convex portion 15 projecting in the axial direction between the one end face 16 of the first chamfered portion and the third and fourth chamfered ridges 25 and 26 is 1.2 mm, the chamfer dimension C1 of the first chamfer 19 and the second chamfer The chamfering dimension C2 of 20 is 0.1 mm, and the third chamfered ridge 25 is the first chamfered ridge 23 and the fourth chamfered ridge 26 is the second chamfered at the position where the movable core 13 is farthest from the fixed core 1. In the electromagnet of one embodiment provided at a position substantially coincident with the ridge portion 24 in the axial direction, the analytical experimental value of the attractive force was 99.6 Newton. The experimental analysis values of the suction force when the dimension H of the convex portion 15 is increased by 0.1 mm are 97.1 Newton at 1.3 mm, 94.4 Newton at 1.4 mm, and 91.2 at 1.5 mm. Newton, 87.4 Newton at 1.6 mm, 83.2 Newton at 1.7 mm, 79.2 Newton at 1.8 mm, and the suction force decreases as the dimension H of the convex portion 15 increases. This is because, at the position where the movable iron core 13 is farthest from the fixed iron core 1, the axial dimension of the convex portion 15 fitted into the annular space 12 at the tip of the coil 7 increases as the dimension H of the convex portion 15 is increased. Therefore, the magnetic flux easily flows in the radial direction perpendicular to the axial direction between the fixed iron core 1 and the movable iron core 13 via the convex portion 15 fitted in the annular space 12, and the radial attractive force is increased. This is because the suction force in the axial direction for sucking the iron core 13 to the fixed iron core 1 is reduced.

  Further, when the dimension H of the convex portion 15 is decreased by 0.1 mm, the analytical experimental value of the suction force is 94.6 Newton at 1.1 mm, 91.9 Newton at 1.0 mm, and 87.2 at 0.9 mm. Newton, 80.4 Newton at 0.8 mm, 75.4 Newton at 0.7 mm, 70.8 Newton at 0.6 mm, and the suction force decreases as the dimension H of the convex portion 15 decreases. This is because between the first chamfered ridge portion 23 and the third chamfered ridge portion 25 and the second chamfered ridge portion 24 as the dimension H of the convex portion 15 is lowered at the position where the movable iron core 13 is farthest from the fixed core 1. Since the separation distance between the first chamfered ridge portion 26 and the fourth chamfered ridge portion 26 increases, the distance between the first chamfered ridge portion 23 and the third chamfered ridge portion 25 and the second chamfered ridge portion 24 and the fourth chamfered ridge portion 26 are increased. This is because it is difficult for the magnetic flux to flow between them, and the axial attractive force for attracting the movable iron core 13 to the fixed iron core 1 is reduced.

  The third chamfered ridge portion 25 and the fourth chamfered ridge portion 26 and the second chamfered ridge portion 24 in the axial direction at the position where the movable iron core 13 is farthest from the fixed core 1, respectively. The third chamfered ridge 25 is caused by a manufacturing tolerance of the dimension H of the convex part 15, the chamfering dimension C1 of the first chamfering 19, and the chamfering dimension C2 of the second chamfering 20. 5 includes the axial displacement between the first chamfered ridge portion 23 and the fourth chamfered ridge portion 26 and the second chamfered ridge portion 24. In the dimension H of the convex portion 15 shown in FIG. 1.2 mm is the reference point a, and the dimensional tolerance ± 0.3 mm is in the range of 0.9 mm to 1.5 mm.

It is a longitudinal cross-sectional view of the electromagnet which showed one Embodiment of this invention. It is an enlarged view of the principal part A of FIG. It is an enlarged view of the principal part B of FIG. It is an enlarged view of the principal part C of FIG. It is the characteristic view which showed the relationship between the attraction force of an electromagnet, and the dimension H of a convex part.

Explanation of symbols

1: fixed iron core 3: annular hole 3B: outer peripheral surface of annular hole 3C: inner peripheral surface of annular hole 4: one end surface of fixed core 5: outer cylinder part 6: inner cylinder part 7: coil 12: annular space 13: movable Iron core 15: Convex portion 15A: Tip surface 15B: Outer peripheral surface of convex portion 15C: Inner peripheral surface of convex portion 16: One end surface of movable iron core 19: First chamfer 19A: First ridge 20: Second chamfer 20A: First 2 ridges 21: 3rd chamfer 21A: 3rd ridge 22: 4th chamfer 22A: 4th ridge 23: 1st chamfer ridge 24: 2nd chamfer ridge 25: 3rd chamfer 26: 4th Chamfered ridge

Claims (2)

  In an electromagnet that moves the moving iron core in the axial direction by the attractive force generated by energizing the coil and attracts it to the fixed iron core, the fixed iron core opens to one end surface in the axial direction to form an annular hole, and the outer circumference of the annular hole An outer cylinder portion is provided on the side, an inner cylinder portion is provided on the inner peripheral side of the annular hole, and the first ridge portion is formed by intersecting the outer peripheral surface of the annular hole and one end surface in the axial direction of the outer cylindrical portion. A second ridge is formed by intersecting the inner peripheral surface of the annular hole and one axial end surface of the inner cylindrical portion, and an annular coil is accommodated in the annular hole, and the inner cylindrical portion of the fixed iron core is connected to the inner cylindrical portion. An annular space is formed at the tip of the coil with the cylindrical portion, and is arranged so as to be movably opposed to the fixed core in the axial direction, and is attracted to one end surface of the fixed core by the suction force generated by energizing the coil. A movable iron core is provided, and the movable iron core has an annular convex part that fits into the annular space of the fixed iron core facing the fixed iron core in the axial direction from one end surface. The convex portion is formed with a third ridge portion by intersecting the outer peripheral surface and the protruding tip surface, and the fourth ridge portion is formed by intersecting the inner peripheral surface and the tip surface. The electromagnet is characterized in that the third ridge portion and the fourth ridge portion substantially coincide with the second ridge portion in the axial direction at a position where the movable iron core is farthest from the fixed core. .   Forming a first chamfer on the first ridge, a second chamfer on the second ridge, a third chamfer on the third ridge, and a fourth chamfer on the fourth ridge; Crossing the chamfer and the outer peripheral surface of the annular hole, the first chamfered ridge, crossing the second chamfer and the inner peripheral surface of the annular hole, the second chamfered ridge, the third chamfer and the A third chamfered ridge is formed by intersecting the outer peripheral surface of the convex portion, and a fourth chamfered ridge portion is formed by intersecting the fourth chamfer and the inner peripheral surface of the convex portion, and the convex portion is the movable The third chamfered ridge portion and the fourth chamfered ridge portion and the second chamfered ridge portion are provided in positions that substantially coincide with each other in the axial direction at a position where the iron core is farthest from the fixed iron core. The electromagnet according to claim 1.

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