JP3988396B2 - Electromagnetic relay and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic relay, and more particularly to an electromagnetic relay characterized by a terminal positioning structure and a method of manufacturing the same.
[0002]
[Prior art]
Conventionally, as an electromagnetic relay, one of terminals extending on both sides of the base is bent from the internal components provided on the base in the same direction as the terminal extending to the other by bending the terminal extending along the base. What has been proposed is proposed (see Japanese Utility Model Publication No. 8-4670). In this electromagnetic relay, a bent portion is formed at the tip of the terminal, and protrusions protruding from both sides of the bent portion are press-fitted into a groove formed in the base, thereby restricting the position of the terminal bent with respect to the base. I am doing so. This is done to eliminate the fact that the springback generated by the bending of the terminals adversely affects the distance between the terminals, which requires high accuracy when mounted on a printed circuit board.
[0003]
[Problems to be solved by the invention]
However, the electromagnetic relay having the above-described configuration is generally very small, has a thin terminal, and has a small step in the bent portion, so that it is difficult to press-fit the protrusions formed on both sides thereof into the groove portion of the base.
Further, the intermediate portion of the terminal is bent at 90 degrees or less in order to bring the terminal into close contact with the base. For this reason, a specially structured mold is required. In addition, cracks or the like may occur in the intermediate portion.
[0004]
Then, even if it is small, this invention makes it a subject to provide the electromagnetic relay which can fix a terminal to a base simply and appropriately.
[0005]
[Means for Solving the Problems]
As a means for solving the above problems, the present invention provides:
The base having a substantially rectangular parallelepiped shape, of the respectively extend from the two sides which are not adjacent terminals to each other, one terminal, said the one surface, by bending along a surface adjacent to said surface, and a terminal extending to the other In an electromagnetic relay that protrudes in the same direction,
The base has an obtuse angle formed by the one surface and a surface adjacent to the surface,
It said adjacent faces, the bent been terminal is formed a guide groove to be disposed,
Of the upper part of the opposing wall of the guide groove, at least one part has a crimping part for positioning the terminal with respect to the base by being crimped,
The bent terminal is
A protruding base that protrudes from one side of the base and is bent at an acute angle;
An intermediate portion formed at an obtuse angle smaller than an angle formed between one surface of the base and a surface adjacent to the surface between the protruding base and the tip,
It is those with a.
[0006]
With this configuration, it is possible to easily fix the terminal to the base simply by partially deforming the guide groove without requiring any processing other than bending along the base. Further, the terminal can be easily bent and damage such as cracks can be avoided.
[0007]
In particular, if a step portion is formed on the terminal protruding side of the base and the groove portion is provided on the lower surface side of the step portion, the crimped portion will not protrude from the base. It is preferable at the point which does not become.
[0008]
Further, the present invention provides a means for solving the above-described problems,
Of the terminals extending from two non-adjacent surfaces of the substantially rectangular parallelepiped base, one terminal is bent along the one surface and a surface adjacent to the one surface, thereby extending to the other. In the method of manufacturing an electromagnetic relay that protrudes in the same direction,
Forming the base so that an angle formed between the one surface and a surface adjacent to the one surface is an obtuse angle, and the adjacent surface has a guide groove portion in which the bent terminal is disposed; ,
An obtuse angle smaller than the angle formed by one surface of the base and a surface adjacent to the surface at the intermediate portion from the protruding base portion protruding from one surface of the base to the distal end. Step to bend into
Bending the protruding base at an acute angle and disposing the distal end side from the intermediate portion in the guide groove portion;
Positioning the terminal with respect to the base by caulking at least one portion of the opposing wall upper portion of the guide groove portion to form a caulking portion; and
Is included.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
[0010]
FIG. 1 shows an electromagnetic relay according to the present embodiment. This electromagnetic relay has a configuration in which internal components (not shown) such as a coil block are attached to a base 1 and a case 2 is covered. This electromagnetic relay is very small with a length of about 10 mm, a width of about 8 mm, and a height of about 5 mm.
[0011]
As shown in FIGS. 2 to 7, the base 1 is formed with a recess 3 a (see FIG. 6) that accommodates internal components on the first side surface 3, and is integrated from the upper surface 4 and the lower surface 5 by insert molding or the like. A plurality of terminals 6a and 6b protrude. The terminals 6a and 6b are made of phosphor bronze or the like and have a thickness of about 0.1 mm. Further, a groove portion 8 in which each terminal 6 b is disposed is formed from the upper surface 4 to the second side surface 7. A stepped bent portion 6c is formed on the tip side of the terminal 6b, and the intermediate portion 6d is bent at an obtuse angle, here 93 °. Further, the bottom surface of the groove 8 has an angle α formed between the upper surface 4 and the second side surface 7 that is larger than the bending angle β (see FIG. 3) of the intermediate portion 6d of the terminal 6b, which is 98 ° here. It is formed to become. The second side surface 7 is formed with a step portion 9 having a lower surface 9a on the lower surface side. The groove 8 formed on the lower surface 9 a of the step 9 is a guide groove 10. The guide groove portion 10 positions and fixes the terminal 6b so as not to be detached by crimping the upper portion of the opposing wall to form the crimped portion 11 with the terminal 6b disposed therein. Since the caulking portion 11 is formed on the lower surface 9a of the step portion 9, even if it rises, it does not protrude from the second side surface 7 of the base 1.
[0012]
The case 2 has a substantially rectangular parallelepiped box shape with an open bottom surface. The base 1 is covered from the upper surface side, and the fitting portion and the like are sealed while the opening 12 is fitted to the lower surface 5 of the base 1.
[0013]
Next, a method for assembling the electromagnetic relay will be described.
[0014]
First, as shown in FIG. 2, a stepped bent portion 6 c is formed on the tip side of the terminal 6 b protruding from the upper surface 4 of the base 1.
[0015]
Then, as shown in FIG. 3, the terminal 6b is bent at the intermediate portion 6d. In this case, the bending angle β of the intermediate portion 6 d is an obtuse angle slightly smaller than the angle α formed by the bottom surface of the groove portion 8 between the upper surface 4 of the base 1 and the second side surface 7. As a result, an excessive load is not applied to the terminal 6b and a crack or the like is not generated, and the intermediate portion 6d can be easily bent by a normal pressing process.
[0016]
Subsequently, as shown in FIGS. 4 to 5, the protruding base 6 e of the terminal 6 b is bent along the upper surface 4. At this time, the bending angle of the protruding base 6e is slightly acute (here, about 86 °) as shown in FIG. Further, the terminal 6b and the bottom surface of the groove portion 8 are not in contact with each other, and the intermediate portion 6d of the terminal 6b is deformed until an angle γ (94 ° in this case) slightly larger than the angle β already bent. As a result, the tip of the terminal 6b can be securely brought into close contact with the bottom surface of the guide groove 10, and the distance from the other terminal 6a can be made accurate. Although the protruding base 6e is bent at an acute angle, the protruding base 6e is bent toward the base 1, so that it can be easily performed without requiring a specially structured mold as in the case of bending the intermediate portion 6d. In addition, since the resin base 1 is partially crushed when the protruding base 6e is bent, the protruding base 6e has an arc shape and no cracks or the like are generated.
[0017]
Thereafter, while maintaining the bent state of the terminal 6b, the upper part of the opposing wall of the guide groove 10 is crimped as shown in FIG. This caulking is performed by, for example, pressing a jig such as a pin from both sides (cold caulking). It is also possible to crimp by heating a heated jig (hot crimping).
[0018]
According to the said structure, since the terminal 6b is crimped and fixed by the guide groove part 10, the resin waste etc. which may have a bad influence on an internal component etc. do not generate | occur | produce. Further, the crimping portion 11 can reliably prevent the displacement of the terminal 6b due to the spring back until the base 2 is completely fixed by covering the case 2 and sealing the lower surface 5. Moreover, since the crimping part 11 is formed in the low surface 9a of the step part 9, it does not become a hindrance when the case 2 is covered after mounting the internal components on the base 1.
[0019]
In the embodiment, when the terminal 6b is caulked and fixed to the guide groove portion 10, the caulking portion 11 is formed while the terminal 6b is being pressed. For example, the terminal 6b is temporarily fixed to the guide groove portion 10 in advance. If the protrusions are formed, or the guide groove 10 is press-fitted with a width narrower than that of the terminal 6b, it is not necessary to hold the terminal 6b.
[0020]
In the above embodiment, the upper portions of the opposing walls of the guide groove 10 are swaged, but only one of the facing walls is swaged, the number of swaged portions 11 is increased, or the swaged portions 11 Any structure can be adopted as long as the terminal 6b can be prevented from being detached from the guide groove portion 10 by changing the width dimension of the guide groove 10 or the like.
[0021]
Further, as shown in FIG. 1, the protruding form of the terminal after completion of the electromagnetic relay includes a bent form that can be mounted on a printed board as shown in FIG. 8.
[0022]
【The invention's effect】
As is apparent from the above description, according to the present invention, a groove portion in which a bent terminal is disposed is formed in the base, and the terminal is fixed by crimping the upper portion of the opposing wall of the groove portion. Therefore, the terminal can be securely fixed to the base despite the simple configuration.
[Brief description of the drawings]
FIG. 1 is a perspective view of an electromagnetic relay according to the present embodiment.
FIG. 2 is a perspective view showing a state before the terminal of the base in FIG. 1 is bent.
FIG. 3 is a perspective view showing a state in which the terminal of the base in FIG. 1 is bent at an intermediate portion.
4 is a perspective view showing a state in the middle of bending the terminal of the base in FIG. 1 at a protruding base 6e. FIG.
FIG. 5 is a perspective view showing a state in which a crimping portion is formed after the terminal of the base in FIG. 1 is bent at a protruding base portion 6e.
6 is a cross-sectional view of FIG.
7 is a partially enlarged perspective view showing the caulking portion of FIG. 5. FIG.
FIG. 8 is a perspective view showing an example of another electromagnetic relay according to the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Case 3 ... 1st side surface 4 ... Upper surface 5 ... Lower surface 6 ... Terminal 7 ... 2nd side surface 8 ... Groove part 9 ... Step part 10 ... Guide groove part 11 ... Clamping part 12 ... Opening part

Claims (3)

The base having a substantially rectangular parallelepiped shape, of the respectively extend from the two sides which are not adjacent terminals to each other, one terminal, said the one surface, by bending along a surface adjacent to said surface, and a terminal extending to the other In an electromagnetic relay that protrudes in the same direction,
The base has an obtuse angle formed by the one surface and a surface adjacent to the one surface,
It said adjacent faces, the bent been terminal is formed a guide groove to be disposed,
Of the upper part of the opposing wall of the guide groove, at least one place has a crimping part that positions the terminal with respect to the base by being crimped,
The bent terminal is
A protruding base that protrudes from one side of the base and is bent at an acute angle;
An intermediate portion formed at an obtuse angle smaller than an angle formed between one surface of the base and a surface adjacent to the surface between the protruding base and the tip,
Electromagnetic relay, characterized in that it comprises a.   The electromagnetic relay according to claim 1, wherein a step portion is formed on a terminal protruding side of the base, and the guide groove portion is provided on a lower surface side of the step portion.   Of the terminals extending from two non-adjacent surfaces of the substantially rectangular parallelepiped base, one terminal is bent along the one surface and a surface adjacent to the one surface, thereby extending to the other. In the method of manufacturing an electromagnetic relay that protrudes in the same direction,
  Forming the base so that an angle formed by the one surface and a surface adjacent to the one surface is an obtuse angle, and the adjacent surface has a guide groove portion in which the bent terminal is disposed; ,
  An obtuse angle smaller than an angle formed by one surface of the base and a surface adjacent to the base at the intermediate portion from the protruding base portion protruding from one surface of the base to the distal end. Step to bend into
  Bending the protruding base at an acute angle and disposing the distal end side from the intermediate portion in the guide groove portion;
  Positioning the terminal with respect to the base by caulking at least one portion of the opposing wall upper portion of the guide groove portion to form a caulking portion; and
  The manufacturing method of the electromagnetic relay characterized by including.

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