JP2018010774A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay advantageous to prevent failure in soldering at a connecting terminal.SOLUTION: An electromagnetic relay comprises: a base by which an electromagnetic relay body is held; a housing placed over the base and provided with a housing part in which the electromagnetic relay body is housed; a connecting terminal crossing the upper surface and lower surface of the base and having a folded part 23a to provide a longitudinal folded end 23d by folding one metal piece such that one plate part 23b and the other plate part 23c cover each other; and a sealing material 25 provided on at least part of the lower surface of the base and sealing the housing part. In the folded end 23d, a thin part 23f, in which one plate part 23b is thinner than the other plate part 23c, is formed. The thin part 23f is disposed across the sealing material 25.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electromagnetic relay.

  An electromagnetic relay is an electronic component that switches energization on and off by switching between contact and separation between a movable contact and a fixed contact included in a housing. Here, the movable contact and the fixed contact are respectively connected to a connection terminal that protrudes outside across the base attached to the opening side of the housing. The connection terminal forms a part of a contact member formed by processing a thin metal piece, and the thickness of the terminal is folded in two to increase the strength of the terminal itself or to increase the current capacity. Shaped to get.

  Patent document 1 is disclosing the electromagnetic relay provided with the terminal for a connection made into the predetermined thickness dimension especially by making it fold in half along a longitudinal direction.

JP 2007-66807 A

  In the process of manufacturing an electromagnetic relay, the opening of the housing including the surface of the base is made using a sealing material made of resin in a state where the connection terminal protrudes outward from the base and the base is held on the opening side of the housing The entire side is sealed. Thereby, dustproofness inside a housing can be improved or the support strength of the terminal for a connection can be improved.

  However, when this sealing material is filled, the sealing material before curing is connected to the base connection portion of the connection terminal through the gap between the overlapping end portions extending in the longitudinal direction of the connection terminals. There is a case of scooping up toward the tip. In this case, the scoring seal material is cured as it is, and as a result, a buried portion of the seal material extending in the longitudinal direction is formed in the connection terminal. In general, when a manufactured electromagnetic relay is mounted on a substrate, for example, its connection terminal is soldered. However, if there is such a buried portion of the sealing material in the connection terminal, the sealing material repels the solder, which may cause a soldering failure.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay that is advantageous for suppressing the occurrence of soldering defects in connection terminals.

  An electromagnetic relay according to an aspect of the present invention traverses a base on which an electromagnetic relay main body is held, a housing that is attached to the base and has a storage portion in which the electromagnetic relay main body is stored, and an upper surface and a lower surface of the base. One metal piece is folded on one and the other plate piece and is provided on at least a part of the lower surface of the base and a connection terminal having a push-up portion provided with an overlap end portion in the longitudinal direction, and the storage portion is sealed. And a thin portion where one plate piece is thinner than the other plate piece is formed at the overlapping end portion, and the thin portion is disposed across the seal material.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic relay advantageous to suppressing generation | occurrence | production of the soldering malfunction in a connection terminal can be provided.

It is a figure which shows the external appearance of the electromagnetic relay which concerns on one Embodiment of this invention. It is a figure which shows the internal structure of the electromagnetic relay which concerns on one Embodiment of this invention. It is a figure which shows the shape of the pushing overlap part of the terminal for a connection in one Embodiment. It is a figure for demonstrating the process of a push-ply part in one Embodiment. It is a figure for demonstrating the process of a push-ply part in one Embodiment. It is a figure which shows the state of the pushing overlap part after soldering in one Embodiment. It is a figure which shows the state before and behind soldering in case a thin part does not exist.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the direction in which the connection terminal extends is defined as the Z direction, and the direction in which the tip of the connection terminal faces is the lower side. Further, the X axis and the Y axis are defined so as to be perpendicular to each other in a plane perpendicular to the Z direction.

  First, the structure of the electromagnetic relay in this embodiment is demonstrated. FIG. 1 is a perspective view showing an external appearance of an electromagnetic relay 1 in the present embodiment. FIG. 2 is a cross-sectional view showing the configuration of the electromagnetic relay 1 as seen from the Y direction minus side by cutting the side wall on the Y direction minus side of the housing 10.

  The electromagnetic relay 1 is an electronic component that is installed in various electronic devices and appropriately switches on / off of energization. The electromagnetic relay 1 includes a housing 10, a base 11, an electromagnet block 12, an armature 13, a movable contact portion 14, and a fixed contact portion 15.

  The housing 10 is made of, for example, a resin and is a rectangular parallelepiped box having an opening 10a on the lower side. The housing 10 has a storage portion S that is a rectangular parallelepiped internal space inside each wall portion constituting the housing 10. The housing 10 also has a vent hole 30 that allows air to flow between the storage portion S and the external space.

  The base 11 is a rectangular plate made of synthetic resin, which is an insulating material, and holds the constituent elements of the electromagnet block 12, the armature 13, the movable contact portion 14, and the fixed contact portion 15. In the base 11, connection terminals extending from the electromagnet block 12, the movable contact portion 14, and the fixed contact portion 15 are crossed across the upper surface and the lower surface, that is, from the housing portion S of the housing 10 to the outside. A plurality of insertion holes for projecting are formed. The base 11 is attached to the housing 10 by fitting the peripheral edge thereof to the inner peripheral portion of the opening 10 a of the housing 10. In this state, the storage portion S stores the electromagnetic relay body having the electromagnet block 12, the armature 13, the movable contact portion 14, and the fixed contact portion 15 except for the terminals protruding outward. After the base 11 is adhered, a sealing material 25 made of a liquid curable resin such as an epoxy seal is filled in the gap on the lower surface of the base 11 or formed on the entire lower surface of the base 11, and then the sealing material 25 is solidified. The In this manner, the sealing material 25 is provided on at least a part of the lower surface of the base 11, and the storage portion S is sealed. Thereby, the dustproof property of the accommodating part S can be improved, or the support strength of the terminal for a connection can be improved.

  The electromagnet block 12 drives the return spring 20 of the movable contact portion 14 by appropriately switching between excitation and non-excitation based on external energization. The electromagnet block 12 includes an iron core having an adsorbing piece 16 at the tip, a coil wound around a coil bobbin that supports the iron core, and a coil terminal 17 to which the coil is connected. The iron core, coil bobbin, and coil body are not shown.

  The armature 13 is a flat conductor, and is disposed at a position facing the suction piece 16 of the return spring 20 constituting the movable contact portion 14.

  The movable contact portion 14 includes a connection terminal 19 connected to the main body portion 18, a movable return spring 20 connected to the main body portion 18, and a movable contact 21 installed at the tip of the return spring 20. .

  The fixed contact portion 15 includes a connection terminal 23 connected to the main body portion 22 and a fixed contact 24 installed at the tip of the main body portion 22.

  Next, the contact operation of the electromagnetic relay 1 will be described. The movable contact 21 and the fixed contact 24 are disposed so as to face each other in the Z direction. When the coil of the electromagnet block 12 is not energized, the fixed contact 24 and the movable contact 21 are separated from each other. On the other hand, when the coil is energized, the movable contact 21 approaches and contacts the fixed contact 24. Here, the time when the coil is not energized refers to the time when the electromagnet block 12 is not energized, and the armature 13 is held away from the attracting piece 16 by the biasing force of the return spring 20 toward the plus side in the Z direction. Is done. On the other hand, the time when the coil is energized refers to the time when the electromagnet block 12 is excited, and the magnetic force of the attracting piece 16 surpasses the biasing force of the return spring 20 and the armature 13 contacts the attracting piece 16. Switching of the contact is performed by moving the movable contact 21 to and from the fixed contact 24 according to the swing of the movable contact portion 14. That is, in the electromagnetic relay 1, when the energization to the coil terminal 17 is switched on / off, the movable contact 21 and the fixed contact 24 come in contact with and separate from each other.

  Next, the shape and processing direction of the external connection terminal of the electromagnetic relay 1 will be described. In the present embodiment, the external connection terminals refer to the coil terminal 17, the connection terminal 19 of the movable contact portion 14, and the connection terminal 23 of the fixed contact portion 15. Here, as an example, the connection terminal 23 of the fixed contact portion 15 will be described.

  FIG. 3 is a diagram illustrating the shape of the push-up portion 23 a that is a part of the connection terminal 23 of the fixed contact portion 15. In particular, FIG. 3A is a perspective view showing an appearance of the push-up portion 23a. The connection terminal 23 includes, for example, a part of the main body part 22 and two push-up parts 23 a that are connected to a part of the main body part 22 and are arranged in the Y direction. FIG. 3A illustrates one of the push-up portions 23a. The push-up portion 23a is formed by processing a metal plate by a method described in detail below.

  The push-up portion 23a is formed by bending one metal piece extending in the Z direction, which is the longitudinal direction, in the Y direction orthogonal to the longitudinal direction. Then, at one end portion in the longitudinal direction, the folded one plate piece 23b and the other plate piece 23c are folded to form an overlapping end portion 23d. In addition, in order to make it easy to attach the electromagnetic relay 1 to the installation position, two notches 23e are provided at the tip of the push-up portion 23a, but this shape is particularly limited in the present embodiment. It is not a thing.

  Furthermore, a thin portion 23f in which one plate piece 23b is thinner than the other plate piece 23c is formed in the overlapping end portion 23d. Here, the position where the thin portion 23f is formed is a part of the overlapping end portion 23d on the base 11 side. More specifically, the thin portion 23f is arranged at a position where a part of the filled sealing material 25 crosses the thin portion 23f when the sealing material 25 is filled in the lower surface of the base 11. Further, the thin portion 23f is provided only in a part of each of the width direction orthogonal to the longitudinal direction, that is, the Y direction, and the longitudinal direction in the overlapping end portion 23d.

  FIG. 3B is an enlarged perspective view of the thin portion 23f shown in FIG. Moreover, FIG.3 (c) is AA sectional drawing in FIG.3 (b), FIG.3 (d) is BB sectional drawing in FIG.3 (c).

  First, as shown in FIG. 3C, in the overlap end portion 23d, when a cross section of a portion that is not the thin portion 23f is viewed, the shape of one plate piece 23b and the other plate piece 23c is a surface in contact with each other. It is symmetric with respect to the border. Note that a gap 23g exists in a part of the overlapping end portion 23d where the one plate piece 23b and the other plate piece 23c face each other.

On the other hand, as shown in FIG. 3D, when the cross section of the thin portion 23f is viewed at the overlapping end portion 23d, one plate piece 23b is close to the other plate piece 23c, They are in contact with no gaps. In this state, the thickness _{d 1} of one plate piece 23b is thinner than the thickness _{d 2} of the other plate piece 23c.

  Next, a method for forming the push-up portion 23a of the connection terminal 23 will be described. 4 and 5 are schematic views showing the formation process of the push-up portion 23a in time series. The connection terminal 23 is integrally formed by being connected to the main body portion 22 constituting the fixed contact portion 15. Therefore, strictly speaking, the overall processing formation is further complicated including the processing of the portion corresponding to the main body portion 22, but for the steps other than the forming step of the push-up portion 23a related to the features of the present embodiment, The description is omitted. 4 and 5, the direction from the upper side to the lower side of the drawing is the vertical direction, and the metal piece P constituting the push-up portion 23a is held on a horizontal plane perpendicular to the vertical direction. Suppose.

  First, as shown to Fig.4 (a), the metal piece P is mounted by making the direction which goes to a back side from the near side in a horizontal surface into a longitudinal direction. Next, the metal piece P is bent in half with respect to the central axis O extending in the longitudinal direction.

  Next, as shown in FIG. 4B, the end portion of the push-up portion 23 a formed by folding the one plate piece 23 b and the other plate piece 23 c is cut by the cutting device 40. Thereby, the width dimension of the Y direction of the pushing overlap part 23a is adjusted. Here, the cutting direction is the vertical direction, that is, the folding direction, as indicated by the white arrow in the figure. Although not shown, before this cutting process, the push-up portion 23a is once pressed in the vertical direction to adjust the thickness in the vertical direction. Further, the gap 23g extending in the longitudinal direction in the overlapping end portion 23d is generated by the pressing process at this time.

  Next, as shown in FIG. 4C, when the cutting of the overlapping end portion 23d by the cutting device 40 proceeds, the remaining portion of the overlapping end portion 23d is pulled by the cutting device 40, thereby protruding in the cutting direction. A protrusion 23h is generated. On the other hand, a part of the gap 23g remains even after the cutting of the part of the overlapping end part 23d is completed.

  Next, as shown in FIG. 5A, in the vertical direction, the positions of one plate piece 23b and the other plate piece 23c are reversed, and the protrusion 23h that has been oriented in the vertical direction so far is It turns to the opposite direction. In this case, the cross-sectional shape of the push-up portion 23a is as follows instead of the cross-sectional shape of the push-up portion 23a shown in FIG. That is, in the cross-sectional shape of the push-up portion 23a, as shown in FIG. 5 (a), either the one plate piece 23b or the other plate piece 23c in the overlap end portion 23d extends in the longitudinal direction and is folded. A protruding portion protruding in the overlapping direction is formed.

  Next, as shown in FIG. 5 (b), the surface hitting device 41 is pressed against the position where the thin portion 23f is formed. Here, the surface hitting direction is a vertical direction as indicated by a white arrow in the figure. That is, the surface hitting direction is opposite to the protruding direction of the protruding portion 23h.

  And as shown in FIG.5 (c), the thin part 23f is formed and the formation process of the pushing overlap part 23a is complete | finished.

  In FIGS. 4 and 5, attention is paid to one push-up portion 23 a for the sake of simplicity of explanation. However, as assumed in the present embodiment, since there are two push-up portions 23a arranged in the Y direction on the connection terminal 23, the formation process as described above proceeds simultaneously for the two push-up portions 23a. It is desirable to do. In this case, the two push-up portions 23a are arranged, for example, so that the overlapping end portions 23d face each other in the Y direction, in order to simplify the cutting process and the surface-setting process as described above. Is desirable.

  Next, the operation and effect obtained by forming the push-up portion 23a of the connection terminal 23 as described above will be described. First, the push-up portion 23a is formed so as to bend a metal piece extending in the longitudinal direction, and bend and overlap one plate piece 23b and the other plate piece 23c. Thereby, especially the strength of the push-up portion 23a among the connection terminals 23 can be ensured, or the current capacity can be increased.

Next, a gap 23g exists at the overlapping end portion 23d of the push-over portion 23a from the time of the forming step shown in FIG. However, in the present embodiment, as shown in FIGS. 3A and 3B, a thin portion 23f is formed in a part of the overlapping end portion 23d extending in the longitudinal direction on the base 11 side. In the thin portion 23f, as shown in FIGS. 5 (b) and 5 (c), one plate piece 23b is faced toward the other plate piece 23c, as shown in FIG. 3 (d). , the thickness _{d 1} of one plate piece 23b is thinner than the thickness _{d 2} of the other plate piece 23c. That is, one plate piece 23b is in close contact with the other plate piece 23c while deforming a part of the other plate piece 23c facing each other. Therefore, there is no gap 23g in the thin portion 23f. As a result, when the sealing material 25 is filled on the lower surface of the base 11 at the time of manufacturing the electromagnetic relay 1, the uncured sealing material 25 travels through the gap 23g toward the front end side of the overlapping end portion 23d due to the capillary phenomenon. The phenomenon of creeping up can be suppressed.

  FIG. 6 is a perspective view showing a state of the push-up portion 23a whose surface is soldered for explaining the effect of the present embodiment. When the manufactured electromagnetic relay 1 is mounted on a substrate, for example, the push-up portion 23a is soldered. At this time, according to the present embodiment, in the thin portion 23f, the gap between the one plate piece 23b and the other plate piece 23c is closed and the closed portion 23i exists, and the closed portion 23i is sealed. The climbing of the material 25 is suppressed. That is, the sealing material 25 stops flowing when it crosses the thin portion 23f, and the sealing material 25 does not exist on the leading end side of the thin portion 23f in the overlapping end portion 23d. Therefore, even if the solder 50 is attached to the push-up portion 23a, the solder 50 is not repelled by the sealing material 25, and good soldering is possible. Note that a small gap may be provided in the closing portion 23i so that the sealing material 25 does not crawl up.

  Here, unlike the present embodiment, a case where the thin end portion 23f does not exist in the overlapping end portion 23d will be described. FIG. 7 is a perspective view showing a state where the thin portion 23 f as in this embodiment does not exist at the overlapping end portion of the push-over portion 60 for reference. Among these, FIG. 7A corresponds to FIG. 3A according to the present embodiment, and shows a state in which the push-over portion 60 is not yet soldered. In this case, there is one gap extending in the longitudinal direction from the base 11 side toward the distal end side at the overlapping end portion. Therefore, when the sealing material 25 is filled in the lower surface of the base, the unsealed sealing material 25 crawls up toward the front end side through the gap between the overlapping end portions. Then, the sealing material 25 fills the gap between the overlapping end portions and hardens, thereby forming one sealing material embedded portion 61 extending in the longitudinal direction.

  FIG. 7B shows a state in which the push-up portion 60 is soldered. As shown in FIG. 7A, when the seal material burying portion 61 is formed at the overlapping end portion of the push-over portion 60, the solder 62 is attached to the push-up portion 60 as shown in FIG. When attached, the solder 50 is repelled by the sealing material 25. Therefore, a portion to which the solder 62 does not adhere is generated at the overlapping end portion of the push-over portion 60, which may cause a soldering failure.

  On the other hand, the thin portion 23f is provided on a part of the overlapping end portion 23d in the longitudinal direction, in particular, on the base 11 side in the present embodiment. However, the thin portion 23f may be provided on the entire overlapping end portion 23d. It is done. Even with such a configuration, the creeping phenomenon of the sealing material 25 can be suppressed.

  In addition, the thin portion 23f is provided only in a part of the width direction orthogonal to the longitudinal direction of the overlapping end portion 23d, that is, the Y direction, particularly in the present embodiment, only in the overlapping end portion 23d. Here, the creeping phenomenon is likely to occur mainly in the vicinity of the overlapping end portion 23d. For example, in the central region of the portion where one plate piece 23b and the other plate piece 23c overlap in the Y direction, or the root region of the bending. It is hard to occur. Therefore, it is not necessary to make the entire Y direction thin in order to achieve the effect of the present embodiment.

  Further, in the present embodiment, the thin portion 23 f is formed by a chamfering process by the chamfering device 41. In particular, the thin portion 23f is a part of the push-up portion 23a and further the overlap end portion 23d. That is, since the surface-coating device 41 has a small surface area to be surfaced, it can be processed with a small pressure. Further, when the thin portion 23f is formed, the deformation of the push-up portion 60 is suppressed when the thin portion 23f is provided on a part of the base 11 side than when the thin portion 23f is provided on the entire overlapping end portion 23d. Can do.

  Moreover, in this embodiment, as shown in FIG.5 (b) and (c), the surface hitting apparatus 41 is not a surface perpendicular | vertical to a folding direction, but is made to contact | abut diagonally with respect to one board piece 23b. Pressure is applied by the tapered surface 41a inclined toward the surface. Thereby, since the edge part of one plate piece 23b faced becomes easy to deform | transform toward the other plate piece 23c, the suitable obstruction | occlusion part 23i can be formed.

  Furthermore, as shown in FIG. 4C, as the cutting by the cutting device 40 proceeds, a protruding portion 23h that extends in the longitudinal direction and protrudes in the cutting direction is generated. Therefore, in the case of performing the surface hitting by the surface hitting device 41, it is desirable that the surface hitting direction is opposite to the protruding direction of the protruding portion 23h, as shown in each drawing of FIG. This makes it easier to form the closed portion 23i in the thin portion 23f and suppress the remaining gap than the case where the facing direction is the same as the protruding direction of the protruding portion 23h.

  As described above, according to the present embodiment, it is possible to provide an electromagnetic relay that is advantageous for suppressing the occurrence of soldering defects in the connection terminals.

  In the above description, the connection terminal 23 of the fixed contact portion 15 is illustrated as an example of the external connection terminal included in the electromagnetic relay 1, but the present invention is a coil terminal 17 that is another external connection terminal, The present invention can also be applied to the connection terminal 19 of the movable contact portion 14.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to this embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 10 Housing 11 Base 23 Connection terminal 23a Pushing-up part 23b One board piece 23c The other board piece 23d Stacking end part 23f Thin part 25 Sealing material P Metal piece S Storage part

Claims (3)

A base on which the electromagnetic relay body is held;
A housing provided on the base and provided with a storage portion in which the electromagnetic relay main body is stored;
A connection terminal having a push-up portion that crosses the upper surface and the lower surface of the base, and one metal piece is folded on one and the other plate piece and an overlapping end portion is provided in the longitudinal direction;
A sealing material provided on at least a part of the lower surface of the base and sealing the storage portion;
With
The overlapped end is formed with a thin portion in which the one plate piece is thinner than the other plate piece,
The thin portion is an electromagnetic relay disposed across the sealing material.   2. The electromagnetic relay according to claim 1, wherein the thin portion is provided at only a part of the width direction orthogonal to the longitudinal direction and a part of the longitudinal direction at the overlapping end portion. A protruding portion that extends in the longitudinal direction and protrudes in the folding direction is formed on either the one plate piece or the other plate piece at the overlapping end portion,
The electromagnetic relay according to claim 1, wherein the thin portion is provided in a part of the protruding portion.

Images