JP4019719B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention relates to an electromagnetic relay characterized by the structure of a contact piece and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, as an electromagnetic relay, a movable contact piece and a fixed contact piece are arranged opposite to each other at a predetermined interval on the base, and the electromagnet is excited and demagnetized to drive the movable contact piece via the movable iron piece, and the movable contact is arranged oppositely. A fixed contact piece of the fixed contact piece is known to come in contact with and away from the fixed contact (see, for example, Japanese Patent Laid-Open No. 5-205595).
[0003]
[Problems to be solved by the invention]
However, in the electromagnetic relay, the movable contact piece and the fixed contact piece are configured differently, and need to be processed in separate steps. That is, materials with different plate thickness (thin plate material for movable contact piece and thick plate material for fixed contact piece) must be prepared for each contact piece and processed into different shapes. Is required.
[0004]
In this case, there is the following problem if the two contact pieces are simply configured identically. That is, if the elastic coefficient of both contact pieces is reduced in order to enhance the operation characteristics of the movable contact piece, the amount of deflection of the fixed contact piece increases when the contact is closed, and a desired contact contact pressure cannot be obtained. On the other hand, when the elastic coefficient of both contact pieces is increased in order to obtain a desired contact contact pressure, the operation characteristics of the movable contact piece are deteriorated.
[0005]
Therefore, the present invention provides an electromagnetic relay that has excellent operating characteristics of a movable contact piece and can secure a desired contact contact pressure, and a method of manufacturing the same, even if the configuration is the same or substantially the same. Let it be an issue.
[0006]
[Means for Solving the Problems]
As a means for solving the above problems, the present invention provides:
In the electromagnetic relay in which the movable contact piece and the fixed contact piece are opposed to each other at a predetermined interval on the base, and the movable contact piece is driven to open and close the contacts provided on the both contact pieces, respectively.
Both the contact pieces have the same configuration,
The base a recess, recessed from the position where the fixed contact piece projects, by Rukoto from the bottom surface of the concave portion is projected the movable contact piece, the elastically deformable area of the movable contact piece, the fixed It is increased compared to the contact piece.
[0007]
With this configuration, even if the elastic coefficient of both contact pieces is a value at which a desired contact contact pressure can be obtained when the contact is closed, the elastically deformable region of the movable contact piece is expanded, so that desired operating characteristics are ensured. It becomes possible.
[0010]
Furthermore, while making the said both contact piece into the same structure,
By forming a protrusion on the base, when the movable contact piece is driven to close the contact, elastic deformation of the fixed contact piece may be suppressed.
[0011]
With this configuration, even when both contact pieces have the same configuration, the protrusion formed on the base can suppress elastic deformation of the fixed contact piece when the contact is closed. Therefore, even if the elastic coefficient of both contact pieces is set to a value that allows the movable contact piece to obtain desired operating characteristics, the deformable area of the fixed contact piece is narrowed by the protrusion, so that the desired contact characteristic can be obtained when the contact is closed. It is possible to obtain contact contact pressure.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the accompanying drawings.
[0014]
1 to 5 show an electromagnetic relay according to the present embodiment. This electromagnetic relay has a configuration in which an electromagnet portion 2 and a contact opening / closing portion 3 are provided on a base 1 and covered with a case 4.
[0015]
The base 1 is formed of a synthetic resin material in a plate shape, and the bottom surface is recessed except for the outer edge as shown in FIG. 3, and is filled with a sealing agent S (see FIG. 8). The filled sealing agent S seals the gap formed on the bottom surface of the base 1 and reinforces the fixed state of the yoke 13, the hinge spring 15, the contact pieces 22 and 23, and the coil terminal 18 described later. A cylindrical spool 5 projects from one end of the base 1, and guide portions 6a, 6b, 6c, 6d (see FIG. 8) are formed at the other end. On the upper surface of the base 1, there is formed a recess 7 for communicating guide portions 6a, 6b to which the contact opening / closing portion 3 is fixed. Locking claws 8 for attaching the case 4 to the base 1 are formed at the center of both side surfaces of the base 1, and standoffs 9 project downward from the center of the four side edges of the lower surface. Yes. A substantially U-shaped guide wall 10 is formed on the upper surface of the spool 5. A pair of protrusions 11 are formed on the opposing surfaces of the guide wall 10.
[0016]
The electromagnet unit 2 includes an electromagnet 12, a yoke 13, a movable iron piece 14, a hinge spring 15, and the like. The electromagnet 12 is obtained by winding a coil 17 around an iron core 16 via a spool 5 constituting a part of the base 1 . At the upper end of the iron core 16, a bowl-shaped magnetic pole portion 16a is formed. Both ends of the coil 17 are wound around coil terminals 18 fixed to the base 1.
[0017]
The yoke 13 is formed by bending a magnetic plate material into a substantially L shape. As shown in FIG. 5, the lower end portion of the iron core 16 is caulked and fixed to the through hole 13a of the horizontal portion, and the vertical portion is the guide portion of the base 1. The upper end portion of the iron core 16 is located on the side of the magnetic pole portion 16a.
[0018]
The movable iron piece 14 is obtained by coating the surface of a magnetic material with a nonmagnetic material. As shown in FIG. 1, a substantially I-shaped drive part 20 is formed at the tip of a bent part 19 on one end side, and the other end side is an iron core. The actuating portion 21 is attracted to the 16 magnetic poles 16a. In the movable iron piece 14, the bent portion 19 is rotatably supported by the upper end portion of the yoke 13, and the operating portion 21 is guided by a projection 11 formed on the guide wall 10 of the spool 5. For this reason, the movable iron piece 14 rotates in a stable state. Further, a protrusion 21 a (see FIG. 5) is formed at the center of the bottom surface of the operating portion 21 by extrusion processing, and surface contact between the operating portion 21 and the magnetic pole portion 16 a of the iron core 16 is prevented.
[0019]
As shown in FIG. 6, the hinge spring 15 is formed by forming a rectangular hole 15 a in a leaf spring and bending the upper end along the bent portion 19 of the movable iron piece 14. The hinge spring 15 is press-fitted into the guide portion 6c of the base 1 at the lower end portion where the press-fit portion 15b is formed, protrudes into a recessed portion on the bottom surface side of the base 1, and is also fixed by a sealing agent that is filled. The rectangular hole 15a of the hinge spring 15 is wide at the bent upper portion, and the drive unit 20 of the movable iron piece 14 is inserted and locked therein. As a result, the hinge spring 15 biases the movable iron piece 14 so that the operating portion 21 of the movable iron piece 14 is kept away from the magnetic pole portion 16 a of the iron core 16.
[0020]
The contact opening / closing unit 3 includes a movable contact piece 22 and a fixed contact piece 23. As shown in FIG. 7, each of the contact pieces 22 and 23 is a strip of conductive plate material, and press-fit portions 22a, 22b, 23a and 23b are formed at the lower end portions, and ribs 22d and 23d are formed from the lower end portions. The narrow terminal portions 22c and 23c having the same length are provided, the reinforcing ribs 24a and 24b are respectively formed in the middle portion, and the movable contact 25 and the fixed contact 26 are respectively crimped and fixed to the upper end portion. is there. Therefore, it can process in the same process which consists only of press work and caulking, and it is not necessary to carry out inventory management separately. The movable contact piece 22 and the fixed contact piece 23 are press-fitted into the guide portions 6a and 6b of the base 1 and face each other at a predetermined interval, so that the contacts 25 and 26 can be contacted and separated. The driving portion 20 of the movable iron piece 14 abuts on the back surface of the movable contact piece 22 (the surface opposite to the movable contact 25), and the movable contact piece 22 is driven by the rotating operation to fix the movable contact 25. The contact 26 is closed. The movable contact piece 22 has a larger elastically deformable region than the fixed contact piece 23 due to the recess 7 formed in the base 1. For this reason, the movable contact piece 22 can be elastically deformed without requiring such a large force until the movable contact 25 is closed to the fixed contact 26.
[0021]
The case 4 has a box shape with an open bottom, and a locking hole 4a through which the locking claw 8 of the base 1 engages and disengages is formed at the bottom of the side surface.
[0022]
Next, the operation of the electromagnetic relay having the above configuration will be described.
[0023]
When the electromagnet 12 is not energized, the movable iron piece 14 rotates about the upper end of the yoke 13 in the clockwise direction by the spring force of the movable contact piece 22 and the hinge spring 15. Therefore, the movable contact piece 22 extends in the vertical direction with respect to the base 1, and the contact point maintains a separated state.
[0024]
Here, when the electromagnet 12 is energized and excited, one end of the movable iron piece 14 is attracted to the magnetic pole surface 16 a of the iron core 16. As a result, the movable iron piece 14 rotates against the elastic force of the movable contact piece 22 and the hinge spring 15, and the movable contact piece 22 bends toward the fixed contact piece 23 side. As is well known, the attractive force of the electromagnet 12 is not proportional to the distance from the magnetic pole portion 14a, but increases rapidly when approaching a certain distance, and conversely changes to a low value until a certain distance. Therefore, although the force acting on the movable contact piece 22 from the movable iron piece 14 is also weak at the initial stage of excitation of the electromagnet 12, the movable contact piece 22 has its elastically deformable region expanded by the recess 7 as described above. Deforms with a small acting force. That is, even with a weak attractive force at the initial stage of excitation of the electromagnet 12, the movable contact piece 22 is smoothly deformed to close the contact. After the contact is closed, the elastic force of the fixed contact piece 23 having a smaller elastically deformable region than the movable contact piece 22 acts, so that the contact closing is possible even though the movable contact piece 22 is easily deformed. A sufficient contact pressure can be obtained later.
[0025]
In the above embodiment, the recess 7 is formed in the base 1 so that the elastically deformable region of the movable contact piece 22 is larger than that of the fixed contact piece 23. However, as shown in FIG. A protrusion 30 that suppresses elastic deformation of the fixed contact piece 23 may be provided in 1 so that the fixed contact piece 23 is less likely to be deformed than the movable contact piece 22. Moreover, it is good also as a structure provided with both the protrusion part 30 and the recessed part 5. FIG.
[0026]
Moreover, in the said embodiment, although the contact pieces 22 and 23 were made the same structure, you may make it form the reinforcement rib 24b only in the fixed contact piece 23. FIG. Since the reinforcing rib 24b can be easily formed by pressing in a separate process, the processing steps of the contact pieces 22 and 23 can be the same except that the reinforcing rib 24b is formed. The formation of the reinforcing rib 24b may be performed at any time, such as before or after the contact is crimped and fixed or punched from the conductive plate. The reinforcing ribs 24b are formed from the lower side of the contact point to the upper side of the press-fitting region to the base 1, but the forming range and number of the reinforcing ribs 24b can be freely set according to the difference in required elastic modulus. . If a large elastic modulus is required, the formation range of the reinforcing ribs 24b can be increased or the number can be increased. If a large elastic modulus is not required, the formation range can be reduced or the number can be reduced. Just do it. In short, it is only necessary that the steps other than the step of forming the reinforcing ribs 24 b can be performed in the same step and the reinforcing ribs 24 b can be formed so that the section modulus of the fixed contact piece 23 is larger than that of the movable contact piece 22.
[0027]
Moreover, in the said embodiment, although the hinge spring 15 formed from the leaf | plate spring was used, as shown in FIG. 10, you may use the linear spring 31 bent.
[0028]
【The invention's effect】
As is clear from the above description, according to the present invention, the operating characteristics of the movable contact piece and the contact contact pressure at the time of closing the contact are set to desired values while making both the contact pieces the same or substantially the same shape. Since it comprised, the material for forming a contact piece, stock management of material, manufacturing equipment, etc. can be made shared, and it becomes possible to reduce cost.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an electromagnetic relay according to the present embodiment.
FIG. 2 is a perspective view showing a state where a case of the electromagnetic relay according to the present embodiment is removed.
3 is a perspective view showing a state viewed from the bottom side of FIG. 2. FIG.
4 is a plan view of FIG. 2. FIG.
5 is a cross-sectional view taken along line VV in FIG.
6 is a perspective view showing the hinge spring of FIG. 1. FIG.
7 is a perspective view showing the contact piece of FIG. 1. FIG.
8 is a partially enlarged view of FIG.
FIG. 9 is a perspective view of an electromagnetic relay according to another embodiment.
FIG. 10 is a perspective view of an electromagnetic relay provided with another form of hinge spring.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Electromagnet part 3 ... Contact opening-and-closing part 4 ... Case 5 ... Spool 6a, 6b, 6c, 6d ... Guide part 7 ... Recess 12 ... Electromagnet 13 ... Yoke 14 ... Movable iron piece 15 ... Hinge spring 22 ... Movable contact piece 23 ... Fixed contact piece 24 ... Reinforcing rib

Claims (2)

In the electromagnetic relay in which the movable contact piece and the fixed contact piece are opposed to each other at a predetermined interval on the base, and the movable contact piece is driven to open and close the contacts provided on the both contact pieces, respectively.
Both the contact pieces have the same configuration,
The base a recess, recessed from the position where the fixed contact piece projects, by Rukoto from the bottom surface of the concave portion is projected the movable contact piece, the elastically deformable area of the movable contact piece, the fixed An electromagnetic relay characterized by being increased compared to a contact piece. In the electromagnetic relay in which the movable contact piece and the fixed contact piece are opposed to each other at a predetermined interval on the base, and the movable contact piece is driven to open and close the contacts provided on the both contact pieces, respectively.
Both the contact pieces have the same configuration,
Characterized in that by forming a protruding portion on the base, upon closing the contacts by driving the movable contact piece, wherein the protruding portion is to suppress the elastic deformation of its contact with the fixed contact piece Electromagnetic relay.

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