JP2543903Y2 - Electromagnetic relay - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay having excellent vibration resistance and shock resistance.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic relay has a movable contact piece, a fixed contact piece, etc. integrated with a spool in order to improve vibration resistance and shock resistance, and the spool is connected to a ceiling surface of a case and an upper surface of a base. It is pinched by.

[0003]

However, in the electromagnetic relay, a high dimensional accuracy is required for the spool, the case, and the base. That is, when the height dimension of the spool is smaller than the distance between the ceiling surface of the case and the upper surface of the base, rattling occurs, and when it is larger, the case cannot be covered. Occurs. For this reason, high precision is required also for the mold for molding the spool and the like,
There was a problem that manufacturing cost was high. The present invention has been made in view of the above problems, and has as its object to provide an inexpensive electromagnetic relay having excellent vibration resistance and shock resistance.

[0004]

According to the present invention, in order to achieve the above object, an electromagnet portion in which a coil is wound on a spool having a contact piece assembled therein is housed in an internal space formed by fitting a case to a base. , An electromagnetic relay to be fixed, a part of a contact piece located between the base and the spool,
An elastic support portion is formed to push up the spool to the ceiling surface side of the case and press-contact the spool.

[0005]

According to the present invention, even if there is some error in the distance between the opposing surface of the case and the upper surface of the base, the electromagnet portion can be moved toward the ceiling of the case. It will be pushed up and pressed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the electromagnetic relay according to the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2, this electromagnetic relay has an electromagnet section 2 attached to a base 1 and a case 23 covered. The electromagnet section 2 is formed by winding a coil 6 around an iron core 5 via a spool 3, and a concave groove 4 is formed on a lower surface of a lower flange 3 b of the spool 3. In this concave groove 4,
The horizontal portion of the yoke 7 having a substantially L-shaped cross section is located,
It is caulked and fixed to the lower end. The yoke 7
The vertically movable portion rotatably supports a movable iron piece 8 which is opposed to the upper end portion (magnetic pole surface) of the iron core 5 so as to be able to come and go. A pair of coil terminals 9 (one not shown) are integrated with the lower flange 3 b of the spool 3, and a lead wire of the coil 6 is wound therearound. Further, a pair of fixed contact pieces 10, 10 are provided on both end flange portions 3a, 3b of the spool 3.
The fixed contacts 11a and 11b provided at the upper end of each fixed contact piece 10 and 10 are vertically opposed in the space formed in the flange 3a on the upper side of the spool 3. A movable contact piece 12 having a substantially U-shaped cross section is fixed by caulking to the lower surface of the spool 3, the back surface of the yoke 7, and the upper surface of the movable iron piece 8, and the movable contact piece 12 fixes the movable iron piece 8 to the yoke 7 in FIG. Of the movable contact 15 in the counterclockwise direction about the vertical tip of
Is in contact with Then, based on the excitation of the electromagnet section 2, the movable iron piece 8 is attracted to the magnetic pole surface of the iron core 5 and rotates clockwise, whereby the movable contact 15 is switched to the lower fixed contact 11b.

As shown in FIG. 3, the movable contact piece 12 is formed by bending a conductive thin plate into a substantially U-shaped cross section. The movable contact 15 extends from the center of the tip edge. On the other hand, approximately H
A letter-shaped slit is provided, and the portions protruding opposite to each other are bent upward by a predetermined angle in the figure to become elastic support portions 17, 17, and the portion cut out between the elastic support portions 17, 17 is raised upward. The terminal portion 18 is bent substantially at right angles. The vertical portion 19 connecting the horizontal portions 13 and 16 has two through holes 2 in the width direction.
0 and 20 are provided, and a square hole 2
1 at both ends. As shown in FIG. 4, the movable contact piece 12 having such a configuration is formed by sequentially punching the conductive strip-shaped thin plates 22 by press working and then bending the conductive strip-shaped thin plates 22 into the above-described shape. Therefore, the width dimension of the conductive strip-shaped thin plate 22 can be shortened by the length dimension of the terminal portion 18, so that the material can be reduced accordingly. The case 23 has a pair of projections 24 on both sides of a central portion of the ceiling surface.

In the electromagnetic relay having the above structure, when the spool 3 integrated with the coil terminals 9 and the like is attached to the base 1 such that the terminals such as the coil terminals 9 project from the lower surface of the base 1, the upper surface of the base 1 is formed. The elastic support portions 17 of the movable contact piece 12 are positioned between the movable contact piece 12 and the lower surface of the spool 3. When the case 23 is fitted to the base 1 in this state, the projection 24 formed on the ceiling surface of the case 23 abuts on the upper surface of the spool 2, and resists the spring force of the elastic support portions 17. The lower surface is pressed against the upper surface of the base 1.

That is, the height of the spool 3 is set slightly smaller than the distance between the upper surface of the base 1 and the end face of the projection 24 provided on the ceiling of the case 23 when the case 23 is fitted to the base 1. Since the difference is absorbed by the amount of deflection of the elastic support portions 17, 17,
There is no need to precisely process the height of the spool 3.
Moreover, in the state assembled in this manner, the spool 3 is held by the elastic support portions 17, 17 in the case 2.
3 is pressed against the projection 24 on the ceiling surface and does not shift due to vibration or the like.

In this embodiment, the movable contact piece 12 has a substantially U-shape. However, the movable contact piece 12 may have a substantially L-shape.
In short, it is sufficient that there is a flat portion located between the base 1 and the spool 3. Although the elastic support portions 17 are provided on the movable contact piece 12, the lower portion of the fixed contact piece 10 may be bent in a crank shape and provided on this portion.

[0011]

As is apparent from the above description, according to the electromagnetic relay of the present invention, the contact piece has an elastic support portion, and the elastic support portion presses the spool against the ceiling surface of the case. Therefore, even if the finished dimensions of the spool and the like vary, the spool can be securely pressed against the ceiling surface of the case and fixed. As a result, there is no need to increase the dimensional accuracy of the spool and the like, and high dimensional accuracy is not required for component processing. Moreover, since the elastic support portion is formed by cutting and raising a part of the contact piece,
It can be manufactured easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an electromagnetic relay.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a perspective view of a movable contact piece.

FIG. 4 is a front view of a belt-shaped thin plate for processing a movable contact piece.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base, 3 ... Spool, 10 ... Fixed contact piece, 12 ...
Movable contact piece, 17 ... elastic support part, 23 ... case.

Claims (1)

(57) [Scope of request for utility model registration] 1. An electromagnetic relay for accommodating and fixing an electromagnet portion having a coil wound around a spool having a contact piece assembled therein in an internal space formed by fitting a case to a base. An electromagnetic relay, wherein an elastic support portion is formed on a part of the contact piece located therebetween to push up the spool toward the ceiling surface side of the case and press-contact the spool.