JPH0260021A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To reduce accumulated error in parts-assembly and retain the principal parts in a fixed relative position with high accuracy by pressing and fixing fixed contact terminals having fixed contacts and movable contact terminals having movable contacts into a spool of an electromagnet block. CONSTITUTION:Coil terminals 25, fixed contact terminals 26a, 26b, movable contact terminals 28 of an electromagnet block 2 on which an amature-block is placed and assembled, are pressed into respective prepared holes 16, 14a, 14b, 15 of a base 1. At the same time, fit-recessed parts 34a, 34b of a spool 23 are fitted onto fit projections 12a, 12b to assemble the electromagnet block 2 on the base. Consequently, a relative position of the principal parts can be entirely determined based on the spool 23 of the electromagnet block 2 in any case, and is not influenced by the degree of accuracy of assembling the electromagnet block to the base 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic relay that opens and closes contacts by swinging an armature block.

(Prior art) Conventionally, electromagnetic relays include, for example,
As shown in Publication No. 3, an electromagnet block is assembled between an electromagnetic block in which a coil is wound via a spool around a substantially U-shaped iron core with both ends bent to form a magnetic pole piece, and the magnetic pole piece. A permanent magnet whose opposing parts are magnetized with the same polarity and whose middle part is magnetized with the opposite polarity, and a protrusion provided approximately in the center with both ends facing the magnetic pole piece. An armature block is swingably supported in a recess provided in the center of the permanent magnet, and the armature block is accommodated in a housing consisting of a base and a case.

In this device, movable contact pieces are provided on both sides of the armature block and supported at the center, and movable contacts are provided at both ends of each movable contact piece so that they can come into contact with and separate from the fixed contact on the base. A T-shaped connecting piece is provided in the center of the movable contact piece to project laterally, and the movable contact piece and a movable contact terminal provided on the base are electrically connected via the connecting piece.

By the way, in this type of electromagnetic ammeter, various adjustments are made after assembly in order to stabilize the operating characteristics by matching the magnetic attraction force of the permanent magnet or electromagnet with the spring load. Dimensions between main parts, such as the positional relationship between the fixed contact and the movable contact, and the positional relationship between the armature block and the electromagnet block, must be maintained with high accuracy so that this can be done easily and in a short time.

(Problems to be Solved by the Invention) However, in the conventional electromagnetic appliance, the fixed contacts are provided on the base, while the movable contacts are provided on both ends of the movable contact piece of the armature block, and then the armature block is supported by the permanent magnet placed on the electromagnetic block housed and assembled in the base, so the positional relationship between the fixed contact and the movable contact depends on the accuracy and the permanent magnet The assembly of the magnet into the electromagnet block affects accuracy. In addition, the iron core of the electromagnet pro J is formed integrally with the sprue, while the armature block is supported on a permanent magnet placed on the electromagnet block, so the magnetic pole surface of the iron core of the electromagnet block and the magnetic pole of the armature block The positional relationship between the permanent magnet and the electromagnet block affects the accuracy of the assembly of the permanent magnet to the electromagnet block.

In this way, the positional relationship between the main parts that determines the operating characteristics of an electromagnetic relay is important, even if the four parts themselves (base, electromagnet block, permanent magnet, and armature block) have high dimensional accuracy, the assembly of each part is difficult. Attachment depends on accuracy. For this reason,
Errors that sometimes occur when assembling each part accumulate, resulting in a large error in the positional relationship between the main parts, and this error varies greatly for each electromagnetic U electric appliance. As a result, the operation varies between products. The properties are not constant, the adjustment work is complicated, and the number of man-hours required for the preparation is large, leading to an increase in manufacturing costs.

The present invention has been made in view of such problems, and an object of the present invention is to provide an electromagnetic U electric appliance in which the accumulation of errors during component assembly is small and the positional relationship between main parts is determined with high precision. .

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an electromagnetic block in which a coil is wound via a spool around a substantially U-shaped iron core with a permanent magnet in the center, and a coil is fixed to the spool of the electromagnet block. A fixed contact terminal having a contact point and a movable contact terminal supporting an intermediate portion of a movable contact piece provided at both ends of the movable contact that presses into contact with the fixed contact are press-fitted and fixed, and the movable contact piece is suppressed on the permanent magnet. The armature block, which opens and opens the contacts, is movably supported so that both ends of the armature block face the magnetic pole portions of the iron core.

(Function) According to the configuration described above, both the fixed contact terminal having a fixed contact and the movable contact terminal having a movable contact are press-fitted into the spool of the electromagnet block, so the positional relationship between the fixed contact and the movable contact is It is determined based on the spool when assembling the electromagnetic block, and the assembly when assembling the electromagnetic block to the base is not affected by accuracy.

In addition, since the armature block is supported on the permanent magnet of the electromagnet block, the positional relationship between its magnetic pole part and the magnetic pole surface of the iron core of the 1ri magnet block is limited to accuracy when assembling the armature block to the electromagnet block. Depends on it.

(Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an electromagnetic relay according to the present invention, roughly consisting of a base 1, an electromagnet block 2, an armature block 5, and a case 6.
It consists of

The base l is a rectangular plate made of insulating synthetic resin, and has insulating walls 11a and Ilb projecting upward at two locations on both sides of the longitudinal centerline, and fittings at both longitudinal ends. Coupling protrusions 12a and 12b are provided to protrude upward. Grooves 13a, 1 are formed on the outer surfaces of the insulating walls +1a, 11b.
3b are provided in the vertical direction, and pilot holes 14a and 1 for fixed contact terminals are provided in the base 1 so as to be continuous with the 1113a and +3b.
4b is drilled. Further, a prepared hole 15 for a movable contact terminal is bored between the insulating walls +1a and Ilb, and the insulating wall 11a
In the figure, there is a pilot hole for the coil terminal on the left side! 6 is drilled.

The electromagnet block 2 roughly includes an iron core 2+, a permanent magnet 22,
The iron core 2I, which is made up of the spool 23, the coil 24, the coil terminal 25, the fixed contact terminals 26a and 26b, the movable contact piece 27, and the movable contact terminal 28, is made of a magnetic material,
As shown in FIG. 4, it is approximately U-shaped with both ends bent upward, and the upper end surfaces thereof serve as magnetic pole surfaces 29a and 29b. The permanent magnet 22 is a rectangular parallelepiped whose upper part is magnetized with an N pole and whose lower part is magnetized with an S pole, and is placed in the center of the iron core 21 .

The spool 23 is formed integrally with the iron core 2I and the permanent magnet 22 by insert molding so as to cover them, and has flanges 30a, 30b, 31 formed at both ends and the center. The magnetic pole faces 29a, 29b of the iron core 2I are exposed on the upper surfaces of the flanges 30a, 30b at both ends, and press-fit grooves 32a are formed in the vertical direction on both sides.

Fixed contact terminal press-fit portion 33a having 32b (not shown)
, 33b are formed, and a fitting recess 34a in which the fitting protrusions 12a, 12b of the base l are fitted is formed on the lower surface.

34b (not shown) is formed. Center flange 31
The N pole of the permanent magnet 22 is exposed on the upper surface, and bearing portions 35 having a semicircular cross section are formed on both sides of the permanent magnet 22, and press-fit grooves 3 are formed on both sides in parallel with the iron core 2I.
A movable contact terminal press-fitting portion 38 is formed which includes a press-fitting pilot hole 37 formed vertically in the center of the press-fitting groove 36.

The coil 24 includes flanges 30a at both ends of the spool 23,
30b and the central flange 31, and both ends of the coil terminal 25, which will be described later, are wound around and connected to a portion 39.

A pair of coil terminals 25 are provided, and are press-fitted into the lower surface of a collar portion 30a at the left end of the spool 23 in the figure, and a portion 39 is provided for coil winding.

Two pairs of fixed contact terminals 26a, 26b are provided, and press-fit portions 33a, 33 of both end flanges 30a, 30b of the spool 23 are provided.
b are press-fitted into the press-fit grooves 32a, 32b from the horizontal direction parallel to the iron core 21, and the upper ends of the pieces press-fitted into the same flanges 30a, 30b are bent horizontally so that they face each other. Fixed contacts 40a and 40b are also formed.

The movable contact piece 27 is a pair of conductors having spring properties that are placed on both sides above the electromagnet block 2, and has movable contacts 41a and 41b formed on the lower surface of both ends. A pair of movable contact terminals 28 are provided, and a support piece 42 is formed by bending the upper ends horizontally so as to face each other, and a guide piece 13 is formed near the support piece 42. The center portion of the movable contact piece 27 is fixed to the support piece 42 by caulking or welding. And this movable contact terminal 2
8 is press-fitted from above into the press-fitting hole 37 of the press-fitting part 38 of the central flange 31 of the spool 23, and the guide piece 43 is press-fitted from above.
is press-fitted into the press-fit lR36, and the movable contacts 41a, 41b of the movable contact piece 27 are pressed against the fixed contacts 40a, 40b.

The armature block 5 is a rectangular armature 5 made of magnetic material.
An insulator 51 made of synthetic resin is integrally provided in the center of the 0. As shown in FIG. 2, a support portion 52 with a semicircular cross section extending in a direction perpendicular to the longitudinal direction is provided at the center of the lower surface of the armature 50. As shown in FIG. Further, on both sides of the center of the lower surface of the insulator 51, as shown in FIG.
A guide shaft portion 53 is formed close to both ends of the upper surface of the top surface, and a pressing portion extending in a direction perpendicular to the longitudinal direction is provided at a position equidistant from the center of the upper surface in the longitudinal direction. 54
a and 54b are provided in a protruding manner. The armature block 5 is constructed by attracting the supporting portion 52 on the back side onto the permanent magnet 22 of the electromagnet block 2, and engaging the guide shaft portion 53 with the bearing portion 35 of the spool 23. , is swingably supported using a contact point between the support portion 52 and the permanent magnet 22 as a fulcrum. Moreover, the pressing part 5 of this armature block 5
The movable contact piece 27 is brought into pressure contact with 4a and 54b.

The case 6 is box-shaped and is fitted onto the base 1 so as to cover the electromagnetic block 2, and is covered with a sole material 7 as shown in FIG.

The assembly of the electric @U electric appliance having the above configuration will be explained.

First, the coil terminal 2 is attached to the spool 23 which has been integrally formed with the iron core 2I and the permanent magnet 22 by insert molding in advance.
5 and wind the coil 24, and after winding both ends of the coil around the winding part 39, the fixed contact terminals 26a and 2C+b are press-fitted into the press-fitted R32a and 32b of the fixed contact terminal press-fitted parts 33a and 33b of the Subur 23. , the armature block 5 is placed on the permanent magnet 22 such that its support portion 52 is attracted to the permanent magnet 22 and the guide shaft portion 53 is engaged with the bearing portion 35 . As a result, the armature block 5 is swingably supported using the contact point between the support portion 52 and the permanent magnet 22 as a fulcrum, and the horizontal movement of the guide shaft portion 53 and the bearing is restrained by the engagement of the portion 35. . Both ends of the armature 50 are magnetized to the magnetic pole at the upper end of the permanent magnet 22, that is, the N pole, and are connected to the magnetic pole parts 29a and 29b of the iron core 21, which are magnetized to the same polarity as the S pole at the lower end of the permanent magnet 22. Working spaces M a and M b are formed between the permanent magnets 22 . iron core 2
+, a magnetic circuit connecting the armature 50 is formed. Note that after placing the armature block 5 first, the fixed contact terminal 26a
, 26b may be press-fitted, or, for example, one flange 30a may be press-fitted.
After the fixed contact terminal 26a is press-fitted into only one portion and the armature block 5 is placed thereon, the remaining fixed contact terminal 26b may be press-fitted into the other flange portion 30b.

Next, the movable contact terminal 28 to which the movable contact piece 27 is fixed is press-fitted into the press-fit pilot hole 37 of the movable contact terminal press-fit portion 38 of the spool 23, and the guide piece 43 is press-fitted into the press-fit groove 36. As a result, the movable contact piece 27 comes into pressure contact with the pressing parts 54a, 54b of the armature block 5, and the movable contacts 41a, 41
b and fixed contact 40a.

Working spaces Sa and Sb are formed between 40b. In reality, the armature block 5 is in an inclined state with one end of the armature 50 being attracted to, for example, the magnetic pole surface 29a of the iron core 21, so that one movable contact 41a is fixed by the spring force. The other movable contact 41 is in pressure contact with the contact 40a.
b is separated from the fixed contact 40b.

Coil terminal 25 fixed contact terminal 2 of electromagnet block 2 assembled with armature block 5 mounted as described above
Press-fit the movable contact terminals 6a, 26b and the movable contact terminals 28 into the respective prepared holes 16, 14a, I4b, +5 of the base l, and fit the fitting recesses 34a, 34b of the spool 23 and the fitting protrusions 12a, I2b of the base l. Then, assemble the electromagnet block 2 to the base 1. Then, fit the case 6 to the base l so as to cover the electromagnet block 2,
As shown in FIG. 4, a seal cutter 7 is filled between the case 6 and the base l and then removed.

In this way, in this embodiment, the iron core 2! , permanent magnet 22, fixed contact terminals 26a, 26b, movable contact terminal 28 with fixed movable contact piece 27, and armature block 5 are assembled. Of these, the iron core 21 and the permanent magnet 22 are molded integrally with the spool 23 by insert molding, so their positional relationship can be determined with high precision. The positions of the fixed contacts 40a and 40b are
It mainly affects the positions of the press-fit grooves 32a, 32b when press-fitting the fixed contact terminals 26a, 26b into the spool 23, but the press-fit i? 132a and 32b are formed in advance when molding the spool 23, so the fixed contacts 40a,
The positional relationship of 40b can be determined with high precision. The positions of the movable contacts 41a and 41b are mainly determined by the movable contact piece 27.
The fixed position of the movable contact terminal 28 and the movable contact terminal 2
8 into the spool 23 (this affects the position, but the fixing of the movable contact piece 27 to the movable contact terminal 28 is done accurately during the parts processing stage, and the press-fit pilot hole 37 is Since the blade is formed in advance when molding the spool 23, the positional relationship between the movable contacts 41a and 4lb can be determined with high precision.The position of the armature block 5 is determined by a bearing that restrains its horizontal movement. is the position of part 35,
Although the assembly to the electromagnetic block 2 affects the accuracy, the bearing part 35 is formed in advance when the spool 23 is molded, and the assembly is performed by the engagement of the guide shaft part 53 and the bearing part 35. Since this is done with relatively high accuracy, the armature 50
The positional relationship between the left and right magnetic pole parts 50a and 50b can be determined with high precision.

Therefore, the positional relationship of the main parts can be determined based on the spool 23 of the electromagnet block 2, and the accuracy of the assembly of the electromagnet block to the base l is not affected. Therefore, there is no cumulative error caused by assembling parts, there is no variation in assembly accuracy between assembled electromagnetic relays, and the operation characteristics are stabilized and the adjustment work is easy and the number of man-hours is reduced. Further, it is no longer necessary to increase the dimensional accuracy of the base l itself.

In this embodiment, the movable contact piece 27 is fixed to the movable contact terminal 28, and the movable contact terminal 28 is press-fitted into the spool 23, so that the movable contact piece does not have a T-shaped connection piece as in the prior art. Unlike the configuration in which the movable contact piece 27 is connected to the movable contact terminal through the movable contact terminal, the movable contact piece 27 is firmly supported and its operation is stable.

In addition, since the armature 50 and the movable contact piece 27 are constructed as separate blocks, they are integrated as in the prior art, and in addition, due to the torsional rigidity of the T-shaped connection piece, the armature block Unlike a configuration in which the swinging motion of the armature 50 is hindered, the seesaw-like swinging motion can be performed only by the armature 50, and the operating characteristics are stabilized.

Next, the operation of the electromagnetic U electric appliance assembled as described above will be explained.

When no current is supplied to the coil 24 via the coil terminal 25 and the electromagnetic block 2 is in the non-energized state, the armature block 5 is moved to the left magnetic pole portion 50 of the armature 50, for example.
a is attracted to the magnetic pole face 29a of the iron core 21, rotates counterclockwise in the figure, and is maintained in an inclined state. and,
The suppressing portion 54b of the armature block 5 pushes up the movable contact piece 27, the suppressing flB D 4 a retreats downward from the movable contact piece 27, the movable contact 41a comes into pressure contact with the fixed contact 40a, and the movable contact 41b presses against the fixed contact 40b. It is in a state separated from.

Supplying current to the coil 24 and connecting the electromagnet block 2 to the iron core 2I
When the magnetic pole part 29a of the armature block 5 is excited so that it becomes the N pole and the magnetic pole part 29b becomes the S pole, the armature block 5 becomes In FIG. 4, the pressing part 54a pushes the movable contact piece 27 by swinging and cutting clockwise, and the pressing part 54a presses the movable contact piece 27.
b retreats downward from the movable contact piece 27, so the movable contact 41
a is opened and separated from the fixed contact 10a, and the movable contact 41b is closed to the fixed contact 40I).

When the current to the coil 24 is reversely switched and excited so that the magnetic pole face 29a of the iron core 21 becomes the S pole and the magnetic pole face 29bh<N pole, the left @ pole part 50a of the armature 50 and the iron core 21
Based on the magnetic attraction force with the magnetic pole surface 29a, the armature block 5 swings counterclockwise in FIG. Separate.

(Effects of the Invention) As is clear from the above description, according to the present invention, the positional relationship of the main parts is determined based on the spool of the ゛/π magnet block, and the parts are assembled without the accumulation of time errors. , the dimensional accuracy becomes high. Moreover, there is no variation in accuracy between finished products, uniform quality is maintained, operational characteristics are stable, adjustment work is facilitated, and the number of man-hours for adjustment work can be reduced.

Furthermore, the base does not affect the positional accuracy of the main parts, and there is no need to increase the precision of the parts, so it has the effect of reducing parts manufacturing costs.

[Brief explanation of the drawing]

1 to 4 show an electromagnetic U electric appliance according to the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a perspective view of the armature block seen from the back side, FIG. 3 is a plan view, and FIG. Figure 4 is a cross-sectional view. 2 electromagnet block, 5... armature block, 2
1 Iron core, 22 Permanent magnet, 23 Spool, 24 Coil, 26a, 26b Fixed contact terminal, 27 Movable contact piece, 28 Movable contact terminal, 29a
, 29b magnetic pole surface, 40a, 40b-fixed contact, 4
1a, 41b・Movable contacts.

Claims (1)

[Claims] (1) A fixed contact terminal having a fixed contact and a movable contact that presses into contact with the fixed contact are attached to the spool of an electromagnetic block in which a coil is wound via a spool around a substantially U-shaped iron core with a permanent magnet in the center. A movable contact terminal that supports the middle of the movable contact piece provided at both ends is press-fitted and fixed, and an armature block that presses the movable contact piece to open the contact is placed on the permanent magnet. An electromagnetic relay characterized by being swingably supported so as to face the magnetic pole face of the electromagnetic relay.