JP3932700B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic relay that opens and closes contacts on the side of an electromagnet block.
[0002]
[Prior art]
Conventionally, as an electromagnetic relay, as shown in Japanese Utility Model Laid-Open No. 7-1554, there is one in which a cylindrical portion for accommodating one end portion of an electromagnet block is integrally formed in a base. In this electromagnetic relay, the fixed contact piece and the movable contact piece are respectively press-fitted and fixed at part of the terminals from both sides of the base.
[0003]
[Problems to be solved by the invention]
However, in the electromagnetic relay, the assembly directions of the electromagnet block, the fixed contact piece, and the fixed contact piece with respect to the base are all different. For this reason, the position of the base must be changed for each assembly component in the assembly process, and efficient assembly cannot be expected. This problem becomes prominent during mass production, and special equipment such as a robot is required to change the position of the base.
[0004]
Moreover, in the said electromagnetic relay, since the cylindrical part is previously formed in the base, the press-fitting position of a contact piece is restrict | limited. The position of the terminal extending from each contact piece is determined at a predetermined position according to the standard. For this reason, there is a limit to downsizing.
[0005]
Therefore, an object of the present invention is to provide an electromagnetic relay capable of efficiently assembling and miniaturizing each component.
[0006]
[Means for Solving the Problems]
According to the present invention, as a means for solving the above-described problems, an electromagnet block is placed on a base, and a movable contact piece and a fixed contact piece are provided upright on one end side of the electromagnet block so as to excite the electromagnet block. -In an electromagnetic relay that opens and closes the movable contact to the fixed contact by driving the movable contact piece by demagnetizing,
The base includes a press-fitting portion into which the contact pieces are press-fitted,
At least one of the contact pieces is press-fitted into each press-fit portion from above the base, and includes a bent portion that is above the press-fit position, along the upper surface of the base, and then upward.
The electromagnet block is covered with an insulating member at least at one end,
The insulating member is configured so as to be integrated with the base from above in a state where the contact pieces are press-fitted into the press-fitting holes of the base, and to cover a portion along the base of the bent portion .
[0007]
With this configuration, the bent portion of the contact piece can be covered with an insulating member, and the contact piece can be disposed below the electromagnet block, which could not be provided in the past, while maintaining desired insulation. Become.
[0008]
Forming a positioning portion on the base ;
The positioning unit positions the insulation member, and, when restricting the moving range of the card for transmitting the driving force generated by the excitation of the electromagnet block on the movable contact piece, in that it can enhance the assembling accuracy preferable.
[0009]
While the contact piece can be assembled to the base from above, a press-fit portion is formed on the insulating member, and a press-fit receiving portion is formed by press-fitting and fixing the press-fit portion by assembling the insulating member on the base from above. Or a slide press-fit receiving portion in which the slide press-fit portion is press-fitted and fixed by placing the insulating member on the base from above and sliding it sideways. Therefore, it is possible to improve efficiency by performing all the assembly work from above.
[0010]
The insulating member may be formed by secondary molding after the electromagnet block and the contact piece are assembled to the base.
[0011]
It is preferable in that the engagement portion is formed on the yoke of the electromagnet block while the engagement receiving portion is formed on the insulating member so that the engagement portion can be engaged. .
[0012]
At least two sets of the movable contact piece and the fixed contact piece are provided, and a part of the contact surface of the base and the insulating member is separated in the width direction for each set of the contact pieces, or the recessed part and the recessed part. It is preferable that the convex portion located inside is provided with a sufficient creepage distance even if the contact opening / closing portion having two or more poles is provided.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
[0014]
FIG. 1 is an exploded perspective view of the electromagnetic relay according to the present embodiment.
[0015]
The electromagnetic relay generally includes a base 1, an electromagnet block 2 provided on the base 1, an insulating member 3, a contact piece 4, and a case 5.
[0016]
As shown in FIG. 2, the base 1 has a rectangular plate shape composed of a thick part 6 and a thin part 7, and the first press-fitting receiving part 8 and the second press-fitting receiving part 9 are provided on the thick part 6 on one end side. Is formed.
[0017]
As shown in FIG. 3A, the first press-fit receiving portion 8 and the second press-fit receiving portion 9 are formed by forming slits 10 a and 10 b in the width direction of the thick portion 6. As will be described later, press-fitting protrusions 51 and 57 of the contact piece 4 are press-fitted into both ends of the slits 10a and 10b, respectively, and the relief recesses toward the other end side of the base 1 are inside thereof. 11a and 11b are formed. Further, a shielding wall 13 protrudes from the partition wall 12 that partitions both the slits 10a and 10b. First insertion holes 14a and 14b for inserting the respective terminal portions 52 of the first fixed contact piece 45 on both sides of the bottom surfaces of the slits 10a and 10b of the first press-fitting portion 8 and one bottom surface of the relief recess 11a. Are respectively drilled. On the other hand, the second insertion holes 15 for inserting the respective terminal portions 60c of the movable contact piece 47 are formed in the bottom surfaces of the respective relief recesses 11b of the second press-fitting receiving portion 9. However, the insertion holes 14a and 14b of the slit 10a are not used at the same time (this will be described later).
[0018]
The thick portion 6 and the thin portion 7 of the base 1 are partitioned by a third press-fit receiving portion 16. The third press-fit receiving part 16 has a contact piece press-fit part 17 projecting in a substantially U-shape on the thick-walled part 6 side, and a guide having a substantially L-shaped cross section located on both sides of the contact piece press-fit part 17 and projecting further upward. Part 18. In the contact piece press-fit portion 17, a press-fit groove 19 is formed on the inner surface of the opposing side wall 32 so as to go downward from the upper edge. The guide part 18 is for guiding the insulating member 3 described later.
[0019]
The thin portion 7 of the base 1 is reinforced by ribs 20 in order to prevent warping and the like, and rectangular press-fitting holes 21 are respectively formed at three locations. The thin portion 7 is provided with third insertion holes 22a and 22b at two locations near one of the guide portions 18 and at one location near the other. Further, the thin-walled portion 7 is formed with locking recesses 23 on both sides of the upper surface on one end side, and an engaging protrusion 24 is provided on one end edge.
[0020]
As shown in FIG. 4, the electromagnet block 2 is obtained by integrating a substantially L-shaped yoke 29 with an electromagnet portion 28 in which a coil 27 is wound around an iron core 25 via a spool 26. The movable iron piece 30 shown in FIG. A pair of guide pieces 31 is formed by obliquely forming both upper ends of the one end side flange portion 26a of the spool 26 and cutting the center portion. In addition, a side wall 32 and a bottom wall 33 are extended from the lower half of both side edges and the lower edge of the one end side flange portion 26 a of the spool 26. Coil terminals 34 around which both ends of the coil 27 are wound are press-fitted and integrated with the side wall 32. The bottom wall 33 is provided with an engagement hole 35 that engages with the engagement protrusion 24 of the base 1. A hinge spring 36 bent in a substantially L shape is integrated with the movable iron piece 30. A locking claw 37 is cut and raised at one end of the hinge spring 36 and is inserted between the base 1 and the electromagnet block 2 so as to be locked to the locking recess 23 of the base 1. Further, a locking portion 38 is formed on the upper portion of the movable iron piece 30, and one end portion of the card 39 is locked there. As shown in FIG. 6, the card 39 has a substantially frame shape, and a stopper portion 40 extending downward is formed at the other end, and a locking projection 41 is formed at the end. The stopper surface 40 a of the stopper portion 40 abuts on the guide portion 18 of the base 1 and regulates the movement range of the card 39. The card 39 is formed with guide holes 42 in which the guide pieces 31 of the spool 26 are located. The guide hole 42 is for enabling the card 39 to move stably.
[0021]
As shown in FIG. 7A, the insulating member 3 has a cylindrical shape that opens only at one end side, and a press-fitting protrusion 43 for press-fitting into each press-fitting hole 21 of the base 1 is formed on the bottom wall 33. ing. In addition, guide grooves 44 are formed in the inner surface of the lower portion of the side wall of the insulating member 3 so that the yoke 29 of the electromagnet block 2 is press-fitted.
[0022]
The contact piece 4 includes a first fixed contact piece 45 and a second fixed contact piece 46, and a movable contact piece 47 disposed therebetween.
[0023]
As shown in FIG. 8A, the first fixed contact piece 45 is formed by pressing a conductive material into a substantially rectangular plate shape. A through hole 45a is formed in the upper part of the first fixed contact piece 45, and a first fixed contact 48 is fixed thereto by caulking. In addition, a cutout portion 49 is formed in each side edge of the first fixed contact piece 45, and a lower side thereof is a first press-fit portion 50 wider than the upper portion of the cutout portion 49. The first press-fit portion 50 can be press-fitted into the first press-fit receiving portion 8 of the base 1 by forming first press-fit protrusions 51 protruding in the thickness direction on both sides. A first terminal 52 is formed at the lower end of the first fixed contact piece 45. As shown in FIG. 8B, the first terminal portion 52 includes two first protrusions that protrude downward in the same plane from both lower end sides of the first fixed contact piece 45, as shown in FIG. 8B. As shown in FIG. 8C, there is a high power use provided with the terminal portion 52 and a low power use provided with one first terminal portion 52 protruding in a crank shape from one side portion of the lower end. In the case of the high power one, the two first terminal portions 52 are respectively inserted into the first insertion holes 14 a provided on both sides of the slit 10 of the base 1. On the other hand, in the case of the low power one, one first terminal portion 52 is inserted into the first insertion hole 14 b provided in one of the relief recesses 11.
[0024]
As shown in FIG. 9A, the second fixed contact piece 46 is formed by pressing a conductive material to form a bent portion 53 that bends at a substantially right angle at the lower end portion. The upper part of the second fixed contact piece 46 is a fixed contact portion 55 in which the second fixed contact 54 is caulked and fixed to the through-hole 46a formed. A lower side of the fixed contact portion 55 is a narrow second press-fit portion 56. The second press-fit portion 56 can be press-fitted into the second press-fit receiving portion 9 of the base 1 by forming second press-fit projections 57 projecting in the plate thickness direction at both upper edge portions thereof. Yes. Further, a second terminal portion 58 extending substantially at a right angle is formed at the tip of the bent portion 53 and is inserted through the second insertion hole 15 of the base 1 and protrudes downward. Similarly to the first fixed contact piece 45, the second terminal portion 58 is for high power consisting of two second terminal portions 58, as shown in FIG. 9B, and as shown in FIG. 9C. Each of the second insertion holes 15 provided on both sides of the slit 10 and the second insertion holes 15 provided on one side of the relief recess 11 respectively. It is designed to be inserted.
[0025]
As shown in FIG. 10A, the movable contact piece 47 includes a plate-like contact piece portion 59 formed by pressing a conductive material, and a terminal portion 60 fixed by caulking to the contact piece portion 59. It is composed of
[0026]
In the upper half of the contact piece 59, a movable contact portion 62 and drive pieces 63 located on both sides thereof are formed by the cut portion 61. A through-hole 46a is formed in the movable contact portion 62, and a movable contact 64 is caulked and fixed so as to be located on both sides thereof. Further, on the upper side edge of each drive piece 63, a semi-circular locking receiving portion 65 whose inner edge is cut and raised is formed. The locking projections 41 of the card 39 are locked to the locking receiving portions 65, respectively. On the other hand, a notch 66 is formed at the center of the lower half of the contact piece 59, and a through hole 59a for caulking and fixing the terminal portion 60 is formed below the notch 66. As described above, the contact piece portion 59 can suppress the stress required for driving the drive piece 63 by the cut portion 61 and the notch 66, and can be even and stable by the drive pieces 63 provided on both sides. You can get the action. In the terminal portion 60, a caulking projection 60a for caulking and fixing to the through hole 59a of the contact piece portion 59, a guide projection 60b for guiding the contact piece portion 59, and a third insertion of the base And a third terminal portion 60c penetrating the holes 22a and 22b. As in the first fixed contact piece 45, the terminal portion 60 also has a high power consisting of two third terminal portions 60c as shown in FIG. 10 (b) and is shown in FIG. 10 (c). As described above, there is a low power type composed of one third terminal portion 60c, and the high power type is inserted into the third insertion hole 22a, and the low power type is inserted into the third insertion hole 22b.
[0027]
As shown in FIG. 1, the case 5 is fitted to the outer edge of the base 1 and the flange portion of the spool 26 of the electromagnet block 2 to cover each component. A gas hole 67 is formed in the ceiling surface of the case 5 so as to be sealed after evacuating the interior or injecting an inert gas.
[0028]
Then, the assembly method of the said electromagnetic relay is demonstrated. Here, an electromagnetic relay for high power will be described.
[0029]
First, each contact piece 4 is assembled to each press-fitting portion of the base 1. The first fixed contact piece 45 is assembled by pressing the first press-fitting protrusion 51 of the first press-fitting part 50 into the first press-fitting receiving part 8 of the base 1 from above and projecting the terminal part 60 from the insertion hole. . The second fixed contact piece 46 presses the second press-fitting protrusion 57 of the second press-fitting part 56 into the press-fitting groove 19 formed in the third press-fitting receiving part 16 of the base 1 from above, and the terminal part 60 from the insertion hole. Assemble by protruding. At this time, the bent portion 53 is disposed in the thin portion 7 and does not protrude from the rib 20. The movable contact piece 47 is assembled by press-fitting the terminal portion 60 into the second press-fit receiving portion 9 of the base 1 from above and projecting the terminal from the insertion hole. As described above, the assembly of the contact pieces 4 can be performed from above the base 1, and it is not necessary to change the direction of the base 1, so that the contact pieces 4 can be efficiently performed.
[0030]
When the attachment of each contact piece 4 is completed, the insulating member 3 is assembled to the base 1 as shown in FIG. The insulating member 3 is fixed by guiding one end edge thereof by the guide portion 18 and press-fitting the press-fitting protrusion 43 into the press-fitting hole 21. Accordingly, the bent portion 53 of the second fixed contact piece 46 can be completely covered with the insulating member 3, and the bent portion 53 is disposed below the electromagnet block 2 while maintaining a sufficient insulating state between the two members. It becomes possible.
[0031]
Subsequently, the electromagnet block 2 assembled in advance in a separate process is assembled to the base 1. The electromagnet block 2 is assembled from one end side of the base 1 so that one end thereof is accommodated in the insulating member 3. The electromagnet block 2 is fixed by press-fitting both side edges of the yoke 29 into the guide grooves 44 of the insulating member 3 and engaging the engaging protrusions 24 of the base 1 in the engaging holes 35 of the spool 26. The
[0032]
Next, the movable iron piece 30 to which the hinge spring 36 is attached is assembled to the base 1. One end of the hinge spring 36 is inserted between the base 1 and the electromagnet block 2, and the locking claw 37 is locked to the locking recess 23 of the base 1, so that the movable iron piece 30 is rotatably supported. .
[0033]
Thereafter, the movable iron piece 30 and the movable contact piece 47 are connected by the card 39. Since the movement range of the card 39 is restricted by the guide portion 18 of the base 1 to which the electromagnet block 2 is assembled, it becomes possible to accurately maintain the pushing amount of the movable contact 64 with respect to the second fixed contact 54 at a constant amount. .
[0034]
Finally, by fitting the case 5 to a part of the base 1 and the electromagnet block 2, each component is covered, and the fitting portion is sealed with a sealing agent, and then the gas hole 67 is sealed. Complete the electromagnetic relay.
[0035]
Next, the operation of the electromagnetic relay will be described.
[0036]
In a state where the electromagnet portion 28 is not excited, the movable iron piece 30 biases the movable contact piece 47 through the card 39 by the hinge spring 36, and the movable contact 64 is closed to the second fixed contact 54 of the second fixed contact piece 46. It is made. At this time, since the moving range of the card 39 is restricted by the guide portion 18 provided on the base 1 as described above, the pushing amount of the movable contact 64 with respect to the second fixed contact 54 is kept constant, and a desired contact is achieved. Reliability can be obtained.
[0037]
When the electromagnet portion 28 is excited, the movable iron piece 30 is attracted to the end portion of the iron core 25 and rotated to bend the movable contact piece 47 toward the first fixed contact piece 45 via the card 39. As a result, the movable contact 64 is separated from the second fixed contact 54 and is closed to the first fixed contact 48 of the first fixed contact piece 45.
[0038]
By the way, although the said embodiment demonstrated the case where the structure of this invention was applied to an electromagnetic relay with a contact opening / closing part of 1 pole, it is applicable also to an electromagnetic relay with 2 poles or more.
[0039]
As shown in FIGS. 12 and 15, the electromagnetic relay having a contact opening / closing portion having two poles is provided in each of the press-fit portions 8 a, 8 b, 9 a, and 9 b, in which the contact pieces 4 a and 4 b are partitioned by the partition wall 68. The circuit can be opened and closed. A first groove 69 is formed on the upper surface of the base 1 between the bent portions 53 of the second fixed contact pieces 46a and 46b located on both sides. Further, as shown in FIG. 14, a second groove portion 70 is formed on the bottom surface of the insulating member 3 at a position facing the first groove portion 69. Accordingly, even when the base 1 is configured to be narrow, as shown in FIG. 15, a sufficient creepage distance between the two bent portions 53 can be obtained. In addition, even if it comprises the groove part 69 and 70 by the protrusion which engages with the other which remains one, it can take sufficient creepage distance similarly. Moreover, the other part is the structure similar to the electromagnetic relay which concerns on the said embodiment.
[0040]
In the above embodiment, the insulating member 3 is assembled to the base 1 only by press-fitting its press-fitting protrusion into the press-fitting hole 21 of the base 1. You may make it raise.
[0041]
In addition, as shown in FIG. 16, the insulating member 3 is formed with a substantially L-shaped slide press-fitting portion on the bottom surface, while each slide press-fitting portion is inserted from above and slid in the horizontal direction to be in a press-fitted state. You may make it form a slide press-fit recessed part.
[0042]
The insulating member 3 may be formed by secondary molding after the electromagnet block 2 is assembled to the base 1.
[0043]
【The invention's effect】
As is clear from the above description, according to the electromagnetic relay according to the present invention, the bent portion of the contact piece is covered with the insulating member from above, so that the desired insulating property can be provided in a place where the conventional arrangement is impossible. It is possible to position the contact piece while maintaining the above, and it is possible to reduce the size.
[0044]
Further, since the insulating member and the card are positioned by the positioning portion formed on the base, the assembling accuracy is improved and desired operation characteristics can be obtained.
[0045]
In addition, while the engagement portion is formed on the yoke of the electromagnet block, and the engagement receiving portion that allows the engagement portion to be engaged is formed on the insulating member, the assembly work of the electromagnet block is easily and reliably performed. It is possible to make it happen.
[0046]
In addition, since a part of the contact surface of the base and the insulating member is constituted by a concave portion or a convex portion, even if it has a contact opening / closing portion having two or more poles, a sufficient creepage distance can be taken to make it compact It is possible to maintain the insulation of each contact piece while making it possible.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an electromagnetic relay and its case according to the present embodiment.
FIG. 2 is a perspective view of the base of FIG.
FIG. 3 is a plan view of FIG. 2;
4 is a perspective view of the electromagnet block of FIG. 1. FIG.
FIG. 5 is a perspective view of the movable iron piece of FIG. 1;
6 is a perspective view of the card of FIG. 1. FIG.
7 is a perspective view of the insulating member of FIG. 1. FIG.
8 is a perspective view of the first fixed contact piece of FIG. 1. FIG.
FIG. 9 is a perspective view of the second fixed contact piece of FIG. 1;
10 is a perspective view of the movable contact piece of FIG. 1;
11 is an exploded perspective view showing a state in which an insulating member is assembled to the base of FIG. 1. FIG.
FIG. 12 is a perspective view showing a state where an electromagnetic relay case according to another embodiment is removed.
13 is a cross-sectional view of FIG.
14 is a perspective view of the insulating member in FIG. 12. FIG.
FIG. 15 is a perspective view of the base of FIG.
FIG. 16 is a perspective view of an insulating member according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Electromagnet block 3 ... Insulating member 4 ... Contact piece 16 ... 3rd press-fit receiving part 21 ... Press-fit hole 22 ... 3rd insertion hole 28 ... Electromagnet part 39 ... Card 40 ... Stopper part 40a ... Stopper surface 45 ... 1st One fixed contact piece 46 ... second fixed contact piece 47 ... movable contact piece 53 ... bent portion 68 ... partition wall 69 ... first groove portion 70 ... second groove portion

Claims (3)

An electromagnet block is placed on the base, and a movable contact piece and a fixed contact piece are erected on one end side of the electromagnet block, and the electromagnet block is excited and demagnetized to drive and move the movable contact piece. In electromagnetic relays that open and close contacts to fixed contacts,
The base includes a press-fitting portion into which the contact pieces are press-fitted,
At least one of the contact pieces is press-fitted into each press-fit portion from above the base, and includes a bent portion that is above the press-fit position, along the upper surface of the base, and then upward.
The electromagnet block is covered with an insulating member at least at one end,
The insulating member is configured to be integrated with the base from above in a state where the contact pieces are press-fitted into the press-fitting holes of the base, and to cover a portion along the base of the bent portion. Electromagnetic relay. Forming a positioning portion on the base ;
The positioning unit positions the said insulating member and electromagnetically according to claim 1, characterized in that for regulating the moving range of the card for transmitting the driving force generated by the excitation of the electromagnet block on the movable contact piece relay.   While the contact piece can be assembled to the base from above, a press-fit portion is formed on the insulating member, and a press-fit receiving portion is formed by press-fitting and fixing the press-fit portion by assembling the insulating member on the base from above The electromagnetic relay according to claim 1 or 2, wherein

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