JP2005050663A - Terminal structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal structure preventing a leakage from being generated from the folded part of a terminal which is formed by folding one metallic plate in two. <P>SOLUTION: A movable contact terminal 13 is formed by folding one terminal piece 13a in two, and is disposed in a recessed groove 1a on the side of a base 1. The terminal piece 13a is formed into an almost symmetric shape with respect to the center line in its width direction, each of the side pieces 13b, 13c of the almost symmetric shape is in the form of rectangular strips, and side rims along the longitudinal direction of both side pieces 13b, 13c are integrally connected each other. In one side piece 13b, a notch 21 is formed at a position on the side piece 13c side in the end part of the interior side of an apparatus body, and the notch 21 constitutes an inflow port 22 for a sealing agent. In addition, an introduction path 23 for the sealing agent 20 which reaches the inflow port 22 for the sealing agent from the bottom surface of the base 1 is constituted by a gap between the movable contact terminal 13 and the longitudinal piece 2a of a yoke 2 insert-molded in the recessed groove 1a and base 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a terminal structure of an electric device in which a terminal formed by folding a single metal plate into two is protruded from the bottom surface of a container, and the bottom surface is sealed with a sealant.

  As electric equipment using this type of terminal structure, an electromagnetic relay having a structure as shown in FIGS. 13 and 14 has been conventionally provided.

  In this electromagnetic relay, an excitation coil 3 is inserted into a central through hole of a coil bobbin 4 wound around a winding drum through a hole (not shown) of a lateral piece of an L-shaped yoke 2 insert-molded in a base 1. The tip of the iron core 5 is caulked and fixed, and a fixed contact terminal 7 provided with an NO side fixed contact 6 and a fixed contact terminal 9 provided with an NC side fixed contact 8 are attached to the base 1. Both ends of the exciting coil 3 are electrically connected to coil terminals 3a and 3a that are inserted through holes formed in the base 1.

  Further, the hanging piece 12 of the contact spring 11 of the contact spring block 10 is arranged along the outer surface of the longitudinal piece 2 a of the yoke 2, and the vertical piece of the yoke 2 is inserted into each pair of holes 12 a formed in the hanging piece 12. The contact spring block 10 is fixed to the yoke 2 by inserting and caulking each pair of dowels 2c protrudingly formed on the outer surface of 2a. The contact spring block 10 includes a contact spring 11, movable contacts 17 and 17, which will be described later, and an armature 18.

  The contact spring 11 (hinge spring) includes a movable contact terminal 13 extending from the lower end of the drooping piece 12 and a bent piece 14 that extends integrally from above both upper ends of the drooping piece 12 and then extends obliquely downward from its upper end. 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14. Y-shaped piece 16. The middle leg of the Y-shaped piece 16 projects obliquely downward, and then projects in the direction substantially perpendicular to the plate surface of the hanging piece 12 from its lower end, and the movable contacts 17 and 17 are fixed to the upper and lower surfaces of the tip. Yes. The armature 18 is fixed to the lower surface of the fixed piece 15 by inserting and crimping the dowels 18 a of the strip-shaped armature 18 arranged on the lower surface side of the fixed piece 15 into the holes provided in the fixed piece 15. . The armature 18 has one end in the longitudinal direction in contact with the upper end of the vertical piece 2a of the yoke 2, and the other end is opposed to the adsorption surface 5a of the iron core 5. The bent pieces 14 and 14 are bent. As a result, the upper end portion of the vertical piece 2a of the yoke 2 is supported so as to be rotatable.

  The fixed contact terminals 7 and 9 are bent in an inverted L shape, and the fixed contacts 6 and 8 are caulked and fixed to the horizontal pieces 7a and 9a, respectively, and the lower ends of the vertical pieces 7b and 9b are externally connected. Terminal pieces 7c and 9c are integrally extended. The fixed contact terminals 7 and 9 are fixed to the base 1 with the fixed contacts 6 and 8 facing the movable contacts 17 and 17, respectively. That is, the fixed contacts 6, 8 are arranged opposite to each other in the vertical direction with a gap, and the tip of the Y-shaped piece 16 is inserted between the fixed contacts 6, 8 and provided on both the upper and lower surfaces of the Y-shaped piece 16. When the movable contacts 17 and 17 are opposed to the fixed contacts 6 and 8, and the energizing coil 3 is not energized, the fixed piece 15 is elastically springed upward by the spring elasticity of the bent pieces 14 and 14, thereby the armature. 18 moves away from the adsorption surface 5a of the iron core 5, and the movable contact 17 provided on the upper surface side of the middle leg tip of the Y-shaped piece 16 contacts the NC fixed contact 8. On the other hand, when the exciting coil 3 is energized, the armature 18 is attracted to the attracting surface 5a of the iron core 5 by the magnetic force generated in the exciting coil 3, and the fixed piece 15 is moved downward against the spring force of the bent pieces 14,14. Therefore, the movable contact 17 provided on the lower surface side of the tip of the middle leg of the Y-shaped piece 16 contacts the fixed contact 6 on the NO side.

  Incidentally, the electromagnetic relay shown in FIGS. 13 and 14 is a two-contact type electromagnetic relay, and a pair of yokes 2 are insert-molded on the base 1, and an excitation coil 3 is provided on each of the yokes 2. The iron core 5 is passed through the central through hole of the coil bobbin 4 wound around the winding drum, and the tip of the iron core 5 is caulked and fixed to the hole in the horizontal piece of the yoke 2 and is in contact with the vertical piece 2a of each yoke 2. A spring block 10 is attached. Then, after covering the parts attached to the base 1 and covering the box-shaped cover 19 whose bottom surface is opened, the sealing agent 20 is supplied to the bottom surface of the base 1 to form the base 1 and the cover 19. The inside of the container is sealed.

  Further, in the above-described electromagnetic relay, since the contact spring 11 is required to be flexible, the contact spring 11 is formed of a plate material that is thinner than the fixed contact terminals 7 and 9. On the other hand, since the movable contact terminal 13 needs to have a certain thickness due to a problem in strength or the like, a strip-shaped terminal piece 13a extended from the hanging piece 12 is provided as shown in FIGS. The movable contact terminal 13 is formed by folding back at the center line L1 in the width direction and overlapping the both side edges in the width direction. Then, by preliminarily soldering the surface of the movable contact terminal 13, the fixed contact terminals 7, 9 and the coil terminal 3a (part shown by hatching in FIGS. 13 and 14), the surface of the movable contact terminal 13 is covered, Leakage is prevented by closing the gap between the overlapping portions of the terminal pieces 13a with solder.

As shown in FIG. 11A, the terminal piece 13a is formed in a substantially symmetric shape with respect to the center line L1 in the width direction, and the side pieces 13b and 13c formed in the substantially symmetric shape are elongated. The side edges along the longitudinal direction of both side pieces 13b, 13c are integrally connected to each other. And the left side piece 13b in the figure is continuously and integrally connected to the lower end of the drooping piece 12, the terminal piece 13a is folded back at the center line L1 in the width direction, and the side piece 13c is superimposed on the upper side of the side piece 13b. Thus, the movable contact terminal 13 is formed.
Japanese Utility Model Publication No. 63-56546

  By the way, in recent years, it has been pointed out that when waste electrical equipment is exposed to acid rain, lead may be dissolved from the solder used in the electrical equipment, causing soil contamination and groundwater contamination. Thus, products using so-called lead-free solder instead of conventional lead-containing solder are provided.

  However, there is a problem that lead-free solder has poor wettability compared to conventional lead-containing solder, and when pre-soldering is performed on lead-free movable contact terminal 13 as described above with lead-free solder, Since the surface of the movable contact terminal 13 is merely covered and does not enter the gap between the overlapped portions of the terminal pieces 13a, a cavity X is generated inside the overlapped portion of the terminal pieces 13a (FIG. 11 ( c)).

  And when mounting this electromagnetic relay on a printed circuit board, the movable contact terminal 13, the external terminal pieces 7c, 9c, and the coil terminal 3a are passed through the insertion hole of the printed circuit board, and the movable contact terminal protruding from the insertion hole to the back surface side. 13 and the fixed contact terminals 7 and 9 are clinched (bent at 45 °) and the electromagnetic relay is temporarily fixed to the printed circuit board, and then the movable contact terminal 13 and the fixed contact terminals 7 and 9 are soldered. When the terminal 13 is clinched, a solder crack B is generated at the bent position (A portion in FIG. 12), an opening is generated in the overlapping portion of the terminal piece 13a, and the cavity X is formed in the bent portion of the terminal piece 13a. There was a problem of leaks.

  The present invention has been made in view of the above problems, and its purpose is to prevent leakage from a folded portion of a terminal formed by folding a single metal plate into two. An object of the present invention is to provide a prevented terminal structure.

  In order to achieve the above object, according to the first aspect of the present invention, there are provided a base on which electrical components constituting an electrical circuit are arranged, and a cover that is attached to the surface of the base so as to cover the electrical components. A container and an external connection terminal of an electric circuit which is formed by folding and overlapping one metal plate at an intermediate portion and arranged in a communication portion which communicates the front and back of the base, and has a sealing agent on the back surface of the base Is a terminal structure of an electrical device that seals the container body by enhancing the seal, and in order to allow the sealing agent to flow into the gap between the metal plates stacked on the inner end of the container body at the external connection terminal In addition to providing an agent inflow port, a seal agent introduction path from the back surface of the base to the seal agent inflow port is provided, and a notch is provided in one of the overlapping portions of the metal plates in the vicinity of the seal agent inflow port. To.

  According to this invention, since the sealing agent that has entered the inside of the container via the introduction path enters the gap between the metal plates stacked from the sealing agent inlet, the gap formed between the metal plates is closed with the sealing agent. It is possible to prevent leakage from occurring through a gap formed between the metal plates. Furthermore, since one of the overlapped portions is provided with a notch, the sealing agent can easily flow into the sealing agent inflow port, and the gap formed between the metal plates can be reliably closed with the sealing agent. Therefore, when pre-soldering is performed on the surface of the terminal with lead-free solder, even if a crack occurs in the solder that covers the surface of the terminal by bending the terminal, a gap is created between the stacked metal plates. Because it is blocked by, there is no leakage.

  In the invention of claim 2, in the invention of claim 1, it has a metal part arranged so as to face the introduction path of the sealing agent, and an uneven part is provided in a portion facing the introduction path on the surface of the metal part. It is characterized by.

  According to the present invention, when the metal part is arranged so as to face the introduction path of the sealing agent, the plating layer repels the sealing agent if the plating layer is formed on the part of the metal part facing the introduction path. For this reason, the sealing agent becomes difficult to flow in or the amount of inflow of the sealing agent varies, but by providing an uneven portion, it prevents the sealing agent from being repelled on the surface of the metal part and prevents the sealing agent from flowing in. It can be stabilized.

  In the invention of claim 3, in the invention of claim 2, the uneven part is an uneven part formed by knurling the surface of the metal part, and the same effect as in the invention of claim 2 is provided. is there.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the metal component is disposed so as to face the introduction path of the sealing agent, and a recess is formed in a portion of the surface of the metal part facing the introduction path. A synthetic resin layer is formed in the recess.

  According to the present invention, when the metal part is arranged so as to face the introduction path of the sealing agent, the plating layer repels the sealing agent if the plating layer is formed on the part of the metal part facing the introduction path. Therefore, it becomes difficult for the sealing agent to flow in or the amount of inflow of the sealing agent varies, but by forming a recess in the part of the metal part facing the introduction path, and forming a synthetic resin layer in this recess, It is possible to prevent the sealing agent from being repelled on the surface of the metal part and to stabilize the flow of the sealing agent.

  As described above, in the present invention, since the sealant that has entered the interior of the container via the introduction path enters the gap between the metal plates stacked from the sealant inlet, the gap formed between the metal plates is sealed. It can be blocked with an agent, and leakage can be prevented from occurring through a gap formed between the metal plates. Furthermore, since one of the overlapped portions is provided with a notch, the sealing agent can easily flow into the sealing agent inflow port, and the gap formed between the metal plates can be reliably closed with the sealing agent. Therefore, when pre-soldering is performed on the surface of the terminal with lead-free solder, even if a crack occurs in the solder that covers the surface of the terminal by bending the terminal, a gap is created between the stacked metal plates. Because it is blocked by, there is no leakage.

  Hereinafter, an embodiment in which a terminal structure of the present invention is applied to an electromagnetic relay will be described with reference to the drawings. However, the electric device is not limited to the electromagnetic relay, and it is needless to say that the technical idea of the present invention can be applied to electric devices other than the electromagnetic relay.

(Embodiment 1)
Embodiment 1 of this invention is demonstrated based on drawing. Since the electromagnetic relay of this embodiment has the same configuration as that of the electromagnetic relay described in the prior art, common constituent elements are denoted by the same reference numerals, and illustration and description thereof are omitted. Only the characteristic part will be described in detail.

  1A and 1B show a contact spring 11 to which the terminal structure of the present invention is applied. The contact spring 11 includes a movable contact terminal 13 extended from the lower end of the drooping piece 12 and an upper end of the drooping piece 12. After integrally extending upward from both sides, the bent pieces 14, 14 extending obliquely downward from the upper end thereof are integrally connected to the ends of the bent pieces 14, 14, and the plate surface is substantially orthogonal to the plate surface of the drooping piece 12. And a Y-shaped piece 16 extending from both ends of the fixed piece 15. When the contact spring 11 is caulked and fixed to the vertical piece 2a of the yoke 2 insert-molded in the base 1, the movable contact terminal is inserted into the concave groove 1a serving as a communicating portion that communicates the front and back of the base 1 provided on the side surface of the base 1. 13 is arranged.

  The movable contact terminal 13 is formed by folding a belt-like terminal piece 13a extended from the drooping piece 12 at the center line in the width direction so that both side edges in the width direction overlap each other. Is pre-soldered with lead-free solder.

  As shown in FIG. 1A, the terminal piece 13a is formed in a substantially symmetric shape with respect to the center line in the width direction, and the side pieces 13b and 13c formed in the substantially symmetric shape are each an elongated rectangular shape. It is plate-shaped and formed in a shape in which both corners of the lower end are dropped, and side edges along the longitudinal direction of both side pieces 13b, 13c are integrally connected. The left side piece 13b in the drawing is connected continuously and integrally to the lower end of the drooping piece 12, and a notch 21 is formed at a portion of the side piece 13b on the side piece 13c side at the end of the drooping piece 12 side. It is. Thus, when the terminal piece 13a is folded back at the center line in the width direction and the side piece 13c is superimposed on the upper side of the side piece 13b, the two side pieces 13b and 13c are overlapped except at the portion where the notch 21 is formed. However, only one side piece 13 c is formed at the portion where the notch 21 is formed, and this portion serves as the sealant inlet 22.

  In this way, a part of the two overlapping side pieces 13b and 13c is cut out, and the side piece 13c forms only one part, compared with the part where the two side pieces 13b and 13c overlap. Thus, when only one side piece 13c is provided, the sealing agent 20 easily flows into the gap between the side pieces 13b and 13c, and the gap between the side pieces 13b and 13c can be reliably closed with the sealing agent 20. Further, since the sealing agent inlet 22 is provided at the end of the movable contact terminal 13 on the inner side of the container, the gap on the root side of the movable contact terminal 13 can be closed with the sealing agent 20, and the leakage path Can be reliably shut off.

  The movable contact terminal 13 is disposed in the concave groove 1a of the base 1 and faces the vertical piece 2a of the yoke 2 protruding from the base 1, and the gap between the movable contact terminal 13 and the concave groove 1a is The introduction path 23 of the sealing agent 20 that reaches the sealing agent inlet 22 from the back surface of the base 1 is constituted by the gap between the movable contact terminal 13 and the vertical piece 2 a of the yoke 2.

  Thus, after mounting electrical parts on the surface of the base 1 and covering the surface of the base 1 with the cover 19 so as to cover the electrical parts, the bottom surface of the base 1 is filled with the sealing agent 20, and the base 1 and the cover are covered. When the container 19 is sealed, the bottom surface of the base 1 is sealed with the sealing agent 20, and the sealing agent 20 is guided to the sealing agent inlet 22 through the introduction path 23. 22 flows into the gap between the side pieces 13b and 13c of the terminal piece 13a, so that the gap can be reliably closed with the sealant 20. Therefore, when this electromagnetic relay is mounted on a printed circuit board, the tip of the movable contact terminal 13 is clinched (45 ° bent) through the movable contact terminal 13, the external terminal pieces 7c and 9c and the coil terminal 3a through the hole of the printed circuit board. In this case, even if a solder crack occurs in the preliminary solder covering the surface of the movable contact terminal 13, the gap between the side pieces 13b and 13c and the introduction path 23 are blocked by the sealing agent 20. Leakage can be prevented from occurring.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. Since the basic configuration is the same as that of the first embodiment, common components are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment described above, the movable contact terminal 13 and the longitudinal piece 2a of the yoke 2 insert-molded on the base 1 are opposed to each other, and a part of the introduction path 23 of the sealant 20 is connected to the movable contact terminal 13. It is comprised by the clearance gap between the vertical pieces 2a of the yoke 2. As shown in FIG.

  Here, when the surface of the yoke 2 which is a metal part is subjected to a plating process or the like, the sealing agent 20 travels through the introduction path 23 to repel the sealing agent 20 on the surface of the yoke 2. There is a possibility that the amount of inflow may vary due to the difficulty of entering or the influence of the flowability of the sealing agent 20.

  Therefore, in this embodiment, a knurling process is performed on the facing portion 24 (shaded portion in FIG. 2) of the longitudinal piece 2a of the yoke 2 with respect to the movable contact terminal 13 to form irregularities on the surface of the facing portion 24. Therefore, it is possible to prevent the sealing agent 20 from being repelled on the surface of the facing portion 24 and the amount of the sealing agent flowing in can vary. Therefore, when sealing the container with the sealing agent 20, the sealing agent 20 can be reliably flowed from the bottom surface of the base 1 through the introduction path 23 to the sealing agent inlet 22, and the side from the sealing agent inlet 22. The sealing agent 20 can be poured into the gap between the pieces 13b and 13c to reliably close the gap.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. Since the basic configuration is the same as that of the first embodiment, common components are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment described above, the movable contact terminal 13 and the longitudinal piece 2a of the yoke 2 insert-molded on the base 1 are opposed to each other, and a part of the introduction path 23 of the sealant 20 is connected to the movable contact terminal 13. It is comprised by the clearance gap between the vertical pieces 2a of the yoke 2. As shown in FIG.

  Here, when the surface of the yoke 2 that is a metal part is subjected to plating or the like, the sealing agent 20 is repelled on the surface of the yoke 2, so that the sealing agent 20 passes through the introduction path 23 and enters the inside of the container body. There is a possibility that the amount of inflow may vary due to the difficulty of entering or the influence of the flowability of the sealing agent 20.

  Incidentally, the yoke 2 is formed in an L shape from a magnetic material as shown in FIGS. 4 to 6, and a pair of dowels 2c, 2c for caulking and fixing the contact spring 11 to the outer surface of the vertical piece 2a. And a hole 2d for caulking and fixing the tip of the iron core 5 is provided in the horizontal piece 2b.

  And in this embodiment, as shown to Fig.4 (a) (d) and Fig.8 (a), the concave groove 25 is formed in the site | part facing the movable contact terminal 13 in the vertical piece 2a of the yoke 2. As shown in FIG. When the yoke 2 is insert-molded together with the base 1 to form the base block 27, a synthetic resin layer 26 is formed in the concave groove 25 of the vertical piece 2a (FIGS. 7 (a) to ( d), see FIG. 8B and FIG.

  Thus, in this embodiment, since the concave groove 25 is formed in the portion of the vertical piece 2a of the yoke 2 facing the movable contact terminal 13, and the synthetic resin layer 26 is formed in the concave groove 25, FIG. As shown, the synthetic resin layer 26 in the concave groove 25 is opposed to the movable contact terminal 13, and the movable contact terminal 13 and the yoke 2, which is a metal part, are directly opposed to each other. It is possible to prevent the sealing agent 20 from being repelled on the surface of 2 and the amount of the sealing agent flowing in, and to make the sealing agent 20 flow easily. Therefore, when sealing the container with the sealing agent 20, the sealing agent 20 can be reliably flowed from the bottom surface of the base 1 through the introduction path 23 to the sealing agent inlet 22, and the side from the sealing agent inlet 22. The sealing agent 20 can be poured into the gap between the pieces 13b and 13c to reliably close the gap.

1 shows Embodiment 1, (a) is a front view of a contact spring before bending the movable contact terminal, (b) is a front view of the contact spring in a state where the movable contact terminal is bent, and (c) is a main part of the electromagnetic relay. It is an expanded sectional view. FIG. 9 is a main part enlarged view of a base block according to a second embodiment. It is a principal part expanded sectional view of an electromagnetic relay same as the above. The yoke used for the electromagnetic relay of Embodiment 3 is shown, (a) is a front view, (b) is CC sectional drawing, (c) is a rear view, (d) is DD sectional drawing. It is a top view of a yoke same as the above. It is a bottom view of a yoke same as the above. The base block same as the above is shown, (a) is a front view, (b) is a side view, (c) is a rear view, and (d) is a top view. The same as the above, (a) is a front view of the yoke, (b) is a front view of the base block. It is a principal part enlarged view of a base block same as the above. It is a principal part expanded sectional view of an electromagnetic relay same as the above. A conventional movable contact terminal is shown, (a) is a front view of a contact spring before the movable contact terminal is bent, (b) is a front view of the contact spring in a state where the movable contact terminal is bent, and (c) is a movable contact terminal. FIG. It is a principal part enlarged view of the bending part of a movable contact terminal same as the above. The conventional electromagnetic relay is shown, (a) is sectional drawing seen from the front, (b) is sectional drawing seen from the right side. The state which removed the cover of the electromagnetic relay same as the above is shown, (a) is a front view, (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 1a Groove | groove 2 Relay 2a Vertical piece 13 Movable contact terminal 13a Terminal piece 13b Side piece 13c Side piece 20 Sealing agent 21 Notch 22 Sealing agent inflow port 23 Introduction path

Claims (4)

  An electric part comprising an electric part constituting an electric circuit on the surface, a container body comprising a cover that covers the electric part so as to cover the electric part, and one metal plate at an intermediate part And an external connection terminal of the electric circuit that is formed by folding and overlapping and is disposed in a communication portion that communicates the front and back of the base, and the container is sealed by enriching the back surface of the base with a sealing agent. In the terminal structure of the electrical device to be stopped, at the end of the external connection terminal on the inner side of the vessel body, a sealing agent inlet for allowing the sealing agent to flow into the gap between the overlapped metal plates is provided, A sealing agent introduction path reaching the sealing agent inlet from the back surface of the base is provided, and a notch is provided in one of the overlapped portions of the metal plates in the vicinity of the sealing agent inlet. Terminal structure and butterflies.   2. The terminal structure according to claim 1, further comprising: a metal part disposed so as to face the introduction path of the sealing agent, and an uneven portion provided in a portion facing the introduction path on the surface of the metal part.   The terminal structure according to claim 2, wherein the uneven part is an uneven part formed by performing knurling on the surface of the metal part.   It has a metal part arranged so as to face the introduction path of the sealing agent, and a concave portion is formed in a part of the surface of the metal part facing the introduction path, and a synthetic resin layer is formed in the concave part. The terminal structure according to claim 1.

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