JP6610363B2 - Electromagnet device, electromagnetic contactor including the same, and iron core manufacturing method - Google Patents

Description

  The present invention relates to an electromagnet device, an electromagnetic contactor including the electromagnet device, and a method for manufacturing an iron core.

  An electromagnet device incorporated in an electromagnetic contactor includes a fixed iron core and a movable iron core as iron cores. Each of the fixed iron core and the movable iron core is formed by laminating a plurality of steel plates, and the ends of the rivets are caulked in a state where the rivets are inserted into the rivet insertion holes provided in each of the plurality of steel plates. Each of the fixed iron core and the movable iron core is disposed such that the contact surfaces formed by the steel plate contact surfaces of the plurality of steel plates face each other.

In such an electromagnet device, the armature contact surface of the movable iron core is separated from the armature contact surface of the fixed iron core by a biasing member such as a metal spring, and the armature contact surface of the moveable iron core is an electromagnetic coil. By switching between the contact state by the attraction force, the interruption (separation) and conduction (contact) between the fixed contact and the movable contact are controlled.
For example, Patent Document 1 discloses a fixed iron core and a movable iron core in which a plurality of steel plates are stacked and fastened and fixed by rivets.

Japanese Patent Laid-Open No. 2004-22444

  By the way, tightening and fixing of a plurality of steel plates by rivets is performed by compressing the rivets in the axial direction with the rivets inserted through the rivet insertion holes provided in each of the plurality of steel plates and caulking the ends wide. . At this time, the rivet swells in a direction (radial direction) intersecting the axial direction in the rivet insertion hole. As the rivet bulges, the steel plate is deformed outward in the direction intersecting the thickness direction, and irregularities are generated on the contact surface formed by each steel plate contact surface of the plurality of steel plates. Since the bulge of the rivet becomes larger on the end portion side of the rivet, the deformation of the steel plate becomes the largest in the steel plate located on the outer side among the plurality of steel plates.

On the other hand, if the unevenness of the contact surface of each of the fixed iron core and the movable iron core is rough, it will be easy to generate sag when the electromagnet is attracted (during conduction). Therefore, the unevenness of the contact surface is reduced and the armature surface is as smooth as possible. It is necessary to.
Conventionally, after a plurality of steel plates are fastened and fixed with rivets, the armature surfaces made up of a plurality of steel plate armature surfaces are polished to smooth the armature surfaces. However, the polishing process requires a lot of man-hours due to adjustment of the polishing amount and maintenance of the polishing machine, and the iron core (fixed iron core and movable iron core) needs to be cleaned after the polishing process, so that it takes a long time to complete the product. In addition, polishing powder that could not be cleaned could get caught between the armature contact surface of the movable iron core and the armature contact surface of the fixed iron core when the electromagnet is attracted, which may cause warping. I want to reduce the polishing process.

  The present invention has been made paying attention to the above-mentioned problems of the prior art, and an object of the present invention is to provide a technique capable of smoothing the contact surface of the iron core.

  In order to achieve the above object, an electromagnet device according to an aspect of the present invention includes a fixed iron core and a movable iron core that are laminated with a plurality of steel plates and fixed with rivets, and an electromagnetic coil that moves the movable iron core, and the fixed iron core. Of the laminated steel plates, the steel plates positioned at least at both ends of the laminated steel plates are formed of a rivet insertion hole through which a rivet is inserted, and a rivet insertion hole. And a deformation absorbing portion that is provided next to and absorbs deformation generated in the steel plate due to the bulge of the rivet when the end portion of the rivet is caulked.

Moreover, in order to achieve the said objective, the electromagnetic contactor which concerns on 1 aspect of this invention is provided with the said electromagnet apparatus.
In order to achieve the above object, a method of manufacturing an iron core according to one aspect of the present invention forms a steel plate having an iron core contact surface, a rivet insertion hole, and a deformation absorbing portion provided next to the rivet insertion hole. And a step of laminating a plurality of steel plates in the thickness direction and caulking an end portion of the rivet in a state where the rivet is inserted into each rivet insertion hole of the plurality of steel plates.

  According to one embodiment of the present invention, the armature surface of the iron core can be made smooth.

It is a front view which shows the external appearance structure of the electromagnetic contactor provided with the electromagnet apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the cross-sectional structure along the II-II line | wire of FIG. It is a top view which shows schematic structure of the movable iron core of FIG. It is a front view which shows schematic structure of the movable iron core of FIG. It is an expanded sectional view which expands and shows the cross-section along the III-III line of FIG. It is a top view which shows schematic structure of the fixed iron core of FIG. It is a front view which shows schematic structure of the fixed iron core of FIG. It is an expanded sectional view which expands and shows the cross-section along the IV-IV line of FIG. The figure for demonstrating the manufacturing method of the movable iron core integrated in the electromagnet apparatus which concerns on Embodiment 1 of this invention ((a) is a top view, (b) is the cross-sectional structure along the VV line of (a). Sectional drawing shown, (c) is an enlarged cross-sectional view of the main part of (b). It is a figure for demonstrating the manufacturing method of the movable iron core integrated in the electromagnet apparatus which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the manufacturing method of the movable iron core integrated in the electromagnet apparatus which concerns on Embodiment 1 of this invention. In the electromagnet apparatus which concerns on Embodiment 1 of this invention, it is a figure which shows the modification of a movable iron core. In the electromagnet apparatus which concerns on Embodiment 1 of this invention, it is a figure which shows the modification of a movable iron core. In the electromagnet apparatus which concerns on Embodiment 1 of this invention, it is a figure which shows the modification of a movable iron core. In the electromagnet apparatus which concerns on Embodiment 1 of this invention, it is a figure which shows the modification of a fixed iron core. In the electromagnet apparatus which concerns on Embodiment 1 of this invention, it is a figure which shows the modification of a fixed iron core movable iron core. In an electromagnetic contactor provided with an electromagnet device concerning Embodiment 2 of the present invention, it is a principal part top view showing a schematic structure of a fixed iron core. It is a figure which shows the reference example of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Note that, in the following description of the embodiments and the accompanying drawings, the same reference numerals are given to the same components, and duplicate descriptions are omitted.
In addition, the accompanying drawings described in the following embodiments are not drawn to an accurate scale and dimensional ratio in order to make them easy to see or understand. The present invention is not limited to the description of the embodiments described below unless it exceeds the gist.
(Embodiment 1)
Embodiment 1 demonstrates the manufacturing method of an alternating current type electromagnet apparatus, an electromagnetic contactor provided with the same, and an iron core.

  As shown in FIGS. 1 and 2, the electromagnetic contactor 50 includes a main body case 51, a fixed contact 52, a bridge-type movable contact 53, and the electromagnet device 1. The fixed contact 52, the movable contact 53 and the electromagnet device 1 are disposed in the main body case 51. The body case 51 includes a lower frame 51a and an upper frame 51b. A detachable contact cover 54 is provided on the upper frame 51b.

As shown in FIG. 2, the electromagnet device 1 includes a fixed iron core 10 and a movable iron core 30 as iron cores, an electromagnetic coil 41, and a return spring 45. Each of the fixed iron core 10 and the movable iron core 30 is disposed such that each of the contact surfaces 15 and 35 described later face each other.
As shown in FIGS. 3, 4, and 5, the movable iron core 30 includes a plurality of steel plates 31 stacked in the thickness direction, rivet insertion holes 32 provided in each of the plurality of steel plates 31, and the plurality of steel plates 31. The steel plate 31 is inserted into the rivet insertion hole 32 and the end 33a is caulked with a wide end 33a, and the contact formed by the steel plate contact surface 34 provided on each of the plurality of steel plates 31. And a pole face 35. Each of the plurality of steel plates 31 includes a deformation absorbing portion 36 that absorbs deformation generated in the steel plate 31 due to the swelling of the rivet 33 when the end portion 33a of the rivet 33 is compressed in the axial direction and crimped wide. Is provided next to the rivet insertion hole 32.

Each of the rivet insertion hole 32 and the deformation absorbing portion 36 is disposed at a position away from the contact surface 35. The rivet insertion hole 32 is formed in a circular shape, for example. The deformation absorbing portion 36 is formed by a long hole having a length in the longitudinal direction longer than the inner diameter size of the rivet insertion hole 32, for example.
The movable iron core 30 is connected to a central leg 37 and a pair of outer legs 38 arranged in parallel and spaced apart from the central leg 37 on both sides of the central leg 37 opposite to each other in the width direction. It is constituted by a substantially E-shaped shape connected by the portion 39. Each of the central leg portion 37 and the pair of outer leg portions 38 is formed by the central leg portion 37 and the pair of outer leg portions 38 provided on each of the plurality of steel plates 31, and continuously extends.

The contact surface 35 is provided at the tip of each of the central leg portion 37 and the pair of outer leg portions 38. In the movable iron core 30, the rivet insertion hole 32, the rivet 33, and the deformation absorbing portion 36 are provided in each of the center leg portion 37 and the pair of outer leg portions 38. The deformation absorbing portions 16 of the center leg portion 37 and the pair of outer leg portions 38 are provided on the side of the contact surface 35 of the rivet insertion hole 32.
As shown in FIGS. 3 to 5, the rivet 33 has end portions 13 a on both sides in the longitudinal direction that are caulked wide. Further, as shown in FIGS. 6 to 8, the rivet 13 is also caulked with wide end portions 13 a on both sides in the longitudinal direction. As the rivets 33 and 13, for example, iron, aluminum or copper is used. Moreover, as the steel plates 11 and 31, for example, electromagnetic steel plates are used.

  As shown in FIGS. 3 and 4, the deformation absorbing portion 36 is provided on the side of the contact surface 35 (steel plate contact surface 34) of the rivet insertion hole 32. As shown in FIG. 5, the deformation absorbing portion 36 is formed when the bridge portion 31 a between the rivet insertion hole 32 of the steel plate 31 and the deformation absorbing portion 36 is deformed to caulk the end portion 33 a of the rivet 33. The deformation generated in the steel plate 31 due to the swelling of the rivet 33 is absorbed.

  As shown in FIG. 5, the rivet 33 mainly bulges toward the deformation absorbing portion 36 and hardly bulges to the side opposite to the deformation absorbing portion 36 side. On the deformation absorbing portion 36 side of the rivet 33, the bridge portion 31 a between the rivet insertion hole 32 of the steel plate 31 and the deformation absorbing portion 36 is deformed along with the swelling of the rivet 33, and the deformation generated in the steel plate 31 due to the swelling of the rivet 33. Is absorbed by the deformation absorbing portion 36. On the other hand, the rivet 33 swells toward the deformation absorbing portion 36 due to the deformation of the bridge portion 31a, and hardly swells on the opposite side to the deformation absorbing portion 36 side. This is because the bridge portion 31 a is more easily deformed than the side opposite to the deformation absorbing portion side of the rivet insertion hole 32 of the steel plate 31. Therefore, the center leg portion 37 and the outer leg portion 38 of the movable iron core 30 in which the deformation absorbing portion 36 is provided on the side of the contact surface 35 of the rivet insertion hole 32 are used when the end portion 33a of the rivet 33 is caulked. The deformation that occurs in the steel plate 31 due to the swelling can be absorbed by the deformation absorbing portion 36.

  As shown in FIGS. 6, 7, and 8, the fixed iron core 10 includes a plurality of steel plates 11 stacked in the thickness direction, rivet insertion holes 12 provided in each of the plurality of steel plates 11, and the plurality of steel plates 11. The steel plate 11 is inserted into the rivet insertion hole 12 and the end portion 13a is caulked with a wide end 13a, and the contact formed by the steel plate contact surface 14 provided on each of the plurality of steel plates 11. And a pole face 15. The fixed iron core 10 includes a plurality of steel plates 11 each having a deformation absorbing portion 16 that absorbs deformation generated in the steel plate 11 due to the bulge of the rivet 13 when the end portion 13a of the rivet 13 is compressed in the axial direction and is crimped wide. Is provided next to the rivet insertion hole 12.

Each of the rivet insertion hole 12 and the deformation absorbing portion 16 is disposed at a position away from the contact surface 15. The rivet insertion hole 12 is formed in a circular shape, for example. The deformation absorbing portion 16 is formed by a long hole having a length in the longitudinal direction longer than the inner diameter size of the rivet insertion hole 12, for example.
The fixed iron core 10 is connected to the central leg 17 and a pair of outer legs 18 arranged in parallel and spaced from the central leg 17 on both sides of the central leg 17 opposite to each other in the width direction. It is comprised by the substantially E-shaped shape connected by the part 19. FIG. Each of the central leg 17 and the pair of outer legs 18 is formed by the central leg 17 and the pair of outer legs 18 provided on each of the plurality of steel plates 11, and continuously extends.

  The contact surface 15 is provided at the tip of each of the central leg 17 and the pair of outer legs 18. Each of the pair of outer legs 18 is divided into three protrusions 21 a, 21 b, and 21 c by two cut grooves 20. Each of the two cut grooves 20 is continuously extended by the cut grooves 20 provided on the outer legs of each of the plurality of steel plates 11. A cornering coil 22 is provided at the tip of each of the pair of outer legs 18 so as to be fitted into the two cut grooves 20. The corner coil 22 is a shading coil for reducing fluctuations in the attractive force of the electromagnetic coil 41 caused by an AC power source.

  Of the three protrusions 21a, 21b, and 21c, the armature surface 15 is provided at the tip of each of the protrusion 21b positioned at the center and the protrusion 21a positioned closer to the center leg 17 than the protrusion 21b. No contact surface is provided at the tip of the projection 21c located outside the projection 21b. That is, in the pair of outer leg portions 18, of the three projections 21 a, 21 b, 21 c, each of the two projections 21 a, 21 b located on the central leg portion 17 side is used as the contact portion.

  In the fixed iron core 10, the rivet insertion hole 12, the rivet 13, and the deformation absorbing portion 16 are provided in each of the central leg portion 17 and the pair of outer leg portions 18. The deformation absorbing portion 16 of the central leg portion 17 is provided on the contact surface 15 side of the rivet insertion hole 12. On the other hand, the deformation absorbing portion 16 of each of the pair of outer leg portions 18 is provided on the opposite side of the rivet insertion hole 12 from the contact surface 15 side. This is because the distal end of the pair of outer legs 18 is divided into three protrusions 21a, 21b, and 21c by the cut groove 20, so that the rigidity on the distal end side is low. For this reason, when the deformation absorbing portion 16 is provided on the side of the contact surface 15 of the rivet insertion hole 12 as in the case of the central leg portion 17, as shown in FIG. 18, the two protrusions 21a and 21b used as the contact portions are formed. Among them, the inner protrusion 21a having a narrow width is likely to be deformed. Therefore, in the pair of outer leg portions 18, it is preferable to provide the deformation absorbing portion 16 on the side opposite to the contact surface 15 side of the rivet insertion hole 12.

  As shown in FIG. 8, the deformation absorbing portion 16 rivets when the end portion 13 a of the rivet 13 is caulked by deforming the bridge portion 11 a between the rivet insertion hole 12 of the steel plate 11 and the deformation absorbing portion 16. The deformation generated in the steel plate 31 due to the swelling of 33 is absorbed.

  As shown in FIG. 8, the rivet 13 mainly swells on the deformation absorbing portion 16 side and hardly swells on the side opposite to the deformation absorbing portion 16 side. On the deformation absorbing portion 16 side of the rivet 13, the bridge portion 11 a between the rivet insertion hole 12 of the steel plate 11 and the deformation absorbing portion 16 is deformed with the swelling of the rivet 13, and the deformation that occurs in the steel plate 11 due to the swelling of the rivet 13. Is absorbed by the deformation absorbing portion 16. On the other hand, the rivet 13 swells to the deformation absorbing portion 16 side due to the deformation of the bridge portion 11a, and hardly swells to the side opposite to the deformation absorbing portion 16 side. This is because the bridge portion 11 a is more easily deformed than the side opposite to the deformation absorbing portion 16 side of the rivet insertion hole 12 of the steel plate 11. Therefore, the outer leg portion 18 of the fixed iron core 10 provided with the deformation absorbing portion 16 on the side opposite to the contact surface 15 side of the rivet insertion hole 12 bulges the rivet 13 when the end portion 13a of the rivet 13 is caulked. Therefore, the deformation absorbing portion 16 can absorb the deformation generated in the steel plate 11.

In the central leg portion 17 of the fixed iron core 10, the deformation absorbing portion 16 is provided on the side of the contact surface 15 of the rivet insertion hole 12 as in the case of the central leg portion 37 of the movable iron core 30. When the end portion 13 a of the rivet 13 is caulked, the deformation that occurs in the steel plate 11 due to the swelling of the rivet 13 can be absorbed by the deformation absorbing portion 16.
The deformation of the bridge portions 11a and 31a caused by the swelling of the rivets 13 and 33 affects the distance between the rivet insertion holes 12 and 32 and the deformation absorbing portions 16 and 36. Accordingly, when the end portions 33a and 33a of the rivets 13 and 33 are caulked, the deformation absorbing portions 16 and 36 cause the bridge portions 11a and 31a to bulge in the rivet insertion holes 12 and 32 of the steel plates 11 and 31, respectively. The separation distance from the rivet insertion holes 12 and 32 is set so that the deformation absorbing portions 16 and 36 are more easily deformed than the opposite side.

  The electromagnetic coil 41 generates a magnetic field that attracts the fixed iron core 10 and the movable iron core 30 by electromagnetic force. As shown in FIG. 2, the electromagnetic coil 41 has a winding 42 and a bobbin 43. The winding 42 circulates around the central leg portions 17 and 37 through between the central leg portions 17 and 37 and the outer leg portions 18 and 38 of each of the fixed iron core 10 and the movable iron core 30. The bobbin 43 is obtained by winding the winding 42. The bobbin 43 has a cylindrical portion into which the center leg portions 17 and 37 of the inner diameter side fixed iron core 10 and the movable iron core 30 are inserted and the winding 42 is wound around the outer diameter side. Further, the bobbin 43 is provided with a flange portion that protrudes in a flange shape from both ends of the cylindrical portion toward the outer diameter side.

The return spring 45 is a biasing unit that biases the movable iron core 30 in a direction away from the fixed iron core 10. The return spring 45 is, for example, a coil spring provided between the upper surface of the bobbin 43 of the electromagnetic coil 41 and the movable iron core 30.
The stationary contact 52 and the movable contact 53 are electrical contacts that switch between connection and disconnection of the circuit by contacting and separating from each other. The fixed contact 52 is fixed to the upper frame 51b by a terminal screw 55 with the contact portion facing upward.

The movable contact 53 is fixed to a movable contact support 56 fixed to a back surface portion (upper surface portion in FIG. 2) opposite to the leg portion side of the movable iron core 30. The movable contact 53 is arranged with the contact portion facing the contact portion of the fixed contact 52. Further, a contact spring (not shown) is provided on the side of the movable contact 53 opposite to the movable core 30 side.
The fixed contact 52 and the movable contact 53 are separated when the fixed iron core 10 and the movable iron core 30 are separated from each other, and are in contact with each other when the fixed iron core 10 and the movable iron core 30 are in contact with each other.
Next, a method for manufacturing the movable core 30 as an iron core will be described with reference to FIGS. 10 and 11 show a cross-sectional structure at the same position as the line VV in FIG.

  First, as shown in FIGS. 9A, 9B, and 9C, a steel plate contact surface 34, a rivet insertion hole 32 spaced apart from the steel plate contact surface 34a, and the rivet insertion hole 32 are adjacent to each other. The steel plate 31 which has the deformation | transformation absorption part 36 arrange | positioned in is formed. The steel plate 31 includes a central leg portion 37 and a pair of outer leg portions 38 arranged in parallel and spaced apart from the central leg portion 37 on opposite sides of the central leg portion 37 in the width direction. It is formed in a substantially E-shaped shape that is connected. The steel plate 31 is formed by punching a base material using a predetermined mold. In this steel plate forming process, the steel plate contact surface 34 is formed by shaving. The shaving process may be selectively performed on the steel plate contact surface 34 in a separate process after the punching process, or may be selectively performed on the steel plate contact surface 34 in the punching process. As shown in FIG. 9C, the shaving process can form the steel plate contact surface 34 with a small amount of sag 34a, and can increase the area of the steel plate contact surface 34. Specifically, when the thickness of the steel plate 31 is about 0.7 mm, for example, the steel plate contact surface 34 can be formed with a plane width of about 90% with respect to 100% of the thickness of the steel plate 31.

  Next, as shown in FIG. 10, a plurality of steel plates 31 are arranged in the thickness direction in the cavity 61 of the mold 60, and then clamped to fix the plurality of steel plates 31. The cavity 61 of the mold 60 includes, for example, a first mold 62a and a second mold 62b that press the plurality of steel plates 31 from both sides in the stacking direction, and a plurality of the steel plates 31 on the respective steel plate positive surfaces 34 side and vice versa. The third die 63a and the fourth die 63b are pressed from the side. The plurality of steel plates 31 are clamped in a state where the steel plate contact surfaces 34 are aligned. Thereafter, as shown in FIG. 10, the rivets 33 are inserted into the rivet insertion holes 32 of the plurality of steel plates 31. As the rivet 33, a straight pin type having a length of about 17 mm and having no wide head at one end is used. As the steel plate 31, one having a thickness of about 0.7 mm is used, for example, laminated in 21 steps. The mold 60 may be clamped after the rivets 33 are inserted into the rivet insertion holes 32 of each of the laminated steel plates 31.

Next, as shown in FIG. 11, the rivet 33 is compressed in the axial direction by the compression pin 64 in a state where the rivet 33 is inserted into each rivet insertion hole 32 of the plurality of steel plates 31, and the end 33 a of the rivet 33 is widened. Squeeze and squeeze. In the first embodiment, the rivet 33 is compressed by the compression pins 64 from both ends of the rivet 33, and the ends 33 a on both sides of the rivet 33 are crimped.
Thereafter, by removing the steel plate laminate composed of a plurality of steel plates 31 clamped and fixed by the rivets 33 from the mold 60, the movable iron core 30 having the contact surface 35 composed of the plurality of steel plate contact surfaces 34 is formed. .

  In the rivet tightening step during the manufacturing process of the movable iron core 30, as shown in FIG. 9, each of the central leg portion 37 and the outer leg portion 38 has a steel plate contact surface 34 (contact surface 35) of the rivet insertion hole 32. Since the deformation absorbing portion 36 is provided on the side), deformation that occurs in the legs of the steel plate 31 (the central leg 37 and the outer legs 38) due to the swelling of the rivet 33 when the end 33a of the rivet 33 is caulked. It can be absorbed by the deformation absorber 36. Thereby, even if the rivet 33 is swollen when the end portion 33a of the rivet 33 is crimped, a plurality of steel plate armatures provided on each leg portion (the central leg portion 37 and the outer leg portion 38) of the movable iron core 30. The contact surface 35 formed by the surface 34 can be made smooth.

  Moreover, since the armature surface 35 provided in each leg part (the center leg part 37 and the outer leg part 38) of the movable iron core 30 can be made smooth, conventionally, the several iron core 31 was fastened with the rivet 33. It is possible to reduce the polishing step of the contact surface 35 that has been performed later. Moreover, since the polishing process of the contact surface 35 can be reduced, it is possible to prevent the occurrence of wrinkling due to the polishing powder during the electromagnet suction. Thereby, the reliability improvement of the electromagnet apparatus 1 and the electromagnetic contactor 50 provided with the same can be aimed at.

Further, in the manufacture of the movable iron core 30, the area of the steel plate contact surface 34 can be increased by forming the steel plate contact surface 34 of the steel plate 31 by shaving, so that the contact surface 15 of the fixed core 10 can be increased. And the contact surface 35 of the movable iron core 30 can be stabilized, and the occurrence of twisting and the increase in power consumption at the time of attracting the electromagnet can be suppressed.
In addition, about the manufacturing method of the fixed iron core 10, since it is the same as that of the manufacturing method of the movable iron core 30, description is abbreviate | omitted. In this movable iron core 30, similarly to the fixed iron core 10, the armature surface 15 composed of a plurality of steel plate armature surfaces 14 can be made smooth. Moreover, the polishing process of the contact surface 15 can be reduced. Moreover, the area of the steel plate positive surface 14 can be increased.

As described above, according to Embodiment 1, the armature surface of the iron core can be made smooth.
In addition, since the iron core can be made smooth, it is possible to reduce the step of polishing the armature surface, which has been conventionally performed after a plurality of iron cores are tightened with rivets.
Further, since the steel plate contact surface of the steel plate is formed by shaving in the manufacture of the iron core, the area of the steel plate contact surface can be increased.

  In the first embodiment, the case where the deformation absorbing portion 36 is formed as a long hole having a length in the longitudinal direction longer than the inner diameter size of the rivet insertion hole 32 has been described. According to the study by the present inventors, when the deformation absorbing portion 36 is formed with a long hole, as shown in FIG. 12 (a), it is equal to the outer diameter size of the rivet insertion hole 32 or FIG. 12 (b). As shown in FIG. 5, it was found that the same effect can be obtained even if the rivet insertion hole 32 is shorter than the outer diameter size. Also, in the steel plate 31, as shown in FIG. 12C, the same effect can be obtained by providing a long hole-shaped deformation absorbing portion 36 on the opposite side of the rivet insertion hole 32 from the steel plate contact surface 34 side. I found out that Moreover, as shown in FIG.12 (d), it turned out that the same effect is acquired even if the deformation | transformation absorption part 36 is each provided in the steel plate contact surface 34 side of the rivet penetration hole 32, and the other side. In any case, it is preferable to dispose the deformation absorbing portion 36 on a virtual straight line that crosses the rivet insertion hole 32 and the steel plate contact surface 34 in the extending direction of the leg portion.

  Further, as shown in FIGS. 13A, 13B, and 13C, the deformation absorbing portion 36 is formed by an arc-shaped hole, and at least the rivet insertion hole 32 on the side of the steel plate contact surface 34 and the opposite side thereof. It was found that the same effect can be obtained even if it is arranged on either one. In any case, it is preferable to dispose the deformation absorbing portion 36 on a virtual straight line that crosses the rivet insertion hole 32 and the steel plate contact surface 34 in the extending direction of the leg portion.

  Further, as shown in FIGS. 14A, 14B, and 14C, the deformation absorbing portion 36 is formed as a circular hole, and at least one of the rivet insertion hole 32 on the side of the steel plate contact surface 34 and the opposite side thereof. It was found that the same effect can be obtained even if they are arranged on either side. In any case, it is preferable to dispose the deformation absorbing portion 36 on a virtual straight line that crosses the rivet insertion hole 32 and the steel plate contact surface 34 in the extending direction of the leg portion.

  Further, when the deformation absorbing portion 36 is provided on the steel plate contact surface 34 side of the rivet insertion hole 32 and on the opposite side, the deformation absorbing portion 16 composed of a long hole, an arc-shaped long hole, and a circular hole is combined. It was found that a certain effect can be obtained even if provided. In any case, it is preferable to dispose the deformation absorbing portion 36 on a virtual straight line that crosses the rivet insertion hole 32 and the steel plate contact surface 34 in the extending direction of the leg portion.

A plurality of deformation absorbing portions 36 may be provided so as to surround the rivet insertion hole 36. In any of these cases, it is preferable to dispose the deformation absorbing portion 36 on an imaginary straight line that crosses the rivet insertion hole 32 and the steel plate contact surface 34 at least in the extending direction of the leg portion.
Further, as shown in FIG. 15 (a), in the central leg portion 17 of the steel plate 11, the long hole deformation absorbing portion 16 is provided on the opposite side of the rivet insertion hole 12 from the steel plate contact surface 14 side. As shown in FIG. 15 (b), the same effect can be obtained even if the deformation absorbing portion 16 having a long hole is provided on the steel plate contact surface 34 side of the rivet insertion hole 12 and the opposite side. I understood. In any of these cases, it is preferable to arrange the deformation absorbing portion 16 on a virtual straight line that crosses the rivet insertion hole 12 and the steel plate contact surface 14 in the extending direction of the leg portion.

  Also in the steel plate 11, as shown in FIG. 16 (a), the deformation absorbing portion 16 is formed by an arc-shaped hole, and as shown in FIG. 16 (b), the deformation absorbing portion 16 is formed in a circular shape. It was found that the same effect can be obtained even if the holes are formed. In any of these cases, it is preferable to arrange the deformation absorbing portion 16 on a virtual straight line that crosses the rivet insertion hole 12 and the steel plate contact surface 14 in the extending direction of the leg portion.

  Moreover, according to examination of this inventor, it turned out that the iron core armature surface of the iron core located on the outer side among the plurality of iron cores fastened and fixed by the rivet is displaced most. Accordingly, before the plurality of iron cores are fastened and fixed with rivets, the positions of the core core contact surfaces of the iron cores located on the outside of the plurality of cores to be stacked are different in advance from the core contact surface of the iron core located on the inner side. You may keep it.

(Embodiment 2)
The electromagnetic contactor according to the second embodiment of the present invention is a modification of the shape of the fixed iron core from the electromagnetic contactor 50 according to the first embodiment. Therefore, only the fixed iron core will be described, and the description of other configurations will be omitted. In FIG. 17 and FIG. 18, the cornering coil 22 shown in FIG. 7 is omitted for easy understanding of the drawing.
As shown in FIG. 17, the fixed iron core 10 </ b> B has substantially the same configuration as the fixed iron core 10 of the first embodiment, and the position of the rivet insertion hole 12 is different. That is, the center 12s of the rivet insertion hole 12 is located outside the center 18s of the width along the arrangement direction of the three protrusions (21a, 21b, 21c) of the outer leg 18, that is, away from the center leg 17. In this way, the outer leg 18 is provided.

  In this way, by setting the center 12s of the rivet insertion hole 12 at a position farther from the central leg 18 than the center 18s of the width of the outer leg 18, the rigidity inside the tip of the outer leg 18, that is, Among the three protrusions 21a, 21b, and 21c, the rigidity of the protrusion 21a located on the inner side can be increased, so even when the tip is divided into the three protrusions 21a, 21b, and 21c by the cut groove 20, Similar to the central leg portion 17, the deformation absorbing portion 16 can be arranged on the side of the contact surface 15 of the rivet insertion hole 12.

In the above-described embodiment, the case where straight pin type rivets are used has been described. However, the present invention is not limited to the straight pin type rivets 13 and 33, and a wide head is provided on one end side. You can also use rivets that you have.
In the first and second embodiments described above, the deformation absorbing portion is provided on all the steel plates. However, the deformation absorbing portion may be provided only on a steel plate in a region that is deformed when caulking a rivet. Specifically, in the case where the deformation of the rivet remains within the area of one sheet positioned at both ends of the laminated iron cores, it is only necessary to provide the deformation absorbing portion on only one sheet at both ends. Of course, when the region where the rivet is deformed covers a plurality of steel plates, the deformation absorbing portions may be provided only on the plurality of steel plates located at both ends.

The present invention has been specifically described based on the above-described embodiment. However, the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the invention. .
For example, the present invention can be applied to a direct current type electromagnet device and an electromagnetic contactor including the same.

DESCRIPTION OF SYMBOLS 1 ... Electromagnet apparatus 10, 10B ... Fixed iron core 11 ... Steel plate, 11a ... Bridge part 12 ... Rivet insertion hole 13 ... Rivet, 13a ... End part 14 ... Steel plate contact surface 15 ... Contact surface 16 ... Deformation absorption part 17 ... Center Leg part 18 ... Outer leg part 19 ... Connecting part 20 ... Cut groove 21a, 21b, 21c ... Projection 22 ... Cornering coil 22
DESCRIPTION OF SYMBOLS 30 ... Movable iron core 31 ... Steel plate, 31a ... Bridge part 32 ... Rivet insertion hole 33 ... Rivet, 33a ... End part 34 ... Steel plate contact surface 35 ... Contact surface 36 ... Deformation absorption part 37 ... Central leg part 38 ... Outer leg Part 39 ... Connecting part 41 ... Electromagnetic coil 42 ... Winding 43 ... Bobbin 45 ... Return spring 50 ... Electromagnetic contactor 51 ... Main body case, 51a ... Lower frame, 51b ... Upper frame 52 ... Fixed contact 53 ... Movable contact 54 ... Contact cover 55 ... Terminal screw 56 ... Moving contact support

Claims (5)

A fixed iron core and a movable iron core, which are laminated with a plurality of steel plates and fixed with rivets, and an electromagnetic coil for moving the movable iron core, arranged so that the contact surfaces of the fixed iron core and the movable iron core face each other. Electromagnet device, comprising:
The steel plates positioned at least at both ends of the laminated steel plates are provided adjacent to the rivet insertion holes through which the rivets are inserted and the rivet insertion holes, and the rivets bulge when the ends of the rivets are caulked. possess a deformation absorbing portion for absorbing a deformation generated in the steel sheet by,
The deformation absorbing portion is an electromagnet provided on the side of the contact surface of the rivet insertion hole and having a longer length in the longitudinal direction than the inner diameter size of the rivet insertion hole. apparatus. The fixed iron core includes a central leg and a pair of outer legs arranged in parallel and spaced apart from the central leg on both sides of the central leg opposite to each other. Consists of an E-shaped shape,
The contact surface is provided at the tip of each of the central leg and the pair of outer legs,
The rivet insertion hole and the deformation absorbing portion are provided in each of the central leg portion and the pair of outer leg portions,
The tip of each of the pair of outer legs is divided into three protrusions in the arrangement direction of the pair of outer legs by a cut groove,
2. The electromagnet according to claim 1, wherein a center of the rivet insertion hole of the outer leg portion is located outside a center of a width along an arrangement direction of the three protrusions of the outer leg portion. apparatus. Electromagnetic contactor, characterized in that it comprises an electromagnet device according to claim 1 or 2. A steel plate contact surface, a rivet insertion hole disposed away from the contact surface , and the positive surface side of the rivet insertion hole, and the length in the longitudinal direction is longer than the inner diameter size of the rivet insertion hole Forming a steel plate having a deformation absorbing portion made of a long hole ;
A step of laminating a plurality of the steel plates in a thickness direction, and crimping an end of the rivet in a state where the rivets are inserted into the rivet insertion holes of the plurality of steel plates,
An iron core manufacturing method comprising: The method of manufacturing an iron core according to claim 4 , wherein the steel plate contact surface is formed by a shaving process.

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