JP2548175Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an electromagnetic relay, particularly to a support structure for a movable contact piece.

(Prior Art and Problems to be Solved by the Invention) Conventionally, as a support structure of a movable contact piece according to an electromagnetic relay, there is one described in, for example, JP-A-1-197932.

That is, as shown in FIG. 22, the movable contact pieces 3, 3 arranged in parallel on both sides of the movable iron piece 2 are integrated via the insulating base 4 to form the movable contact piece block 1, and The movable contact piece 3 is welded and integrated with a wide terminal portion 5a of a hinge spring 5 having a substantially T-shaped flat surface projecting laterally from the center of the side of the movable contact piece 3 to a common terminal (not shown). The contact piece block 1 is rotatably supported.

However, in the movable contact piece block 1, since the hinge springs 5, 5 protrude in a direction orthogonal to the direction in which the movable contact pieces 3, 3 extend, the wide ends 5a, 5a are welded and integrated with the common terminal. When supported, not only the bending moment but also the torsional moment is applied to the bases 5b, 5b of the hinge springs 5, 5, and together, the stress concentration is caused. For this reason,
The hinge springs 5, 5 tend to be fatigued and have a short life.

Moreover, since the projecting dimension from the base 5b of the hinge springs 5,5 to the wide end 5a is short, when an impact force is applied from the outside, the impact force cannot be absorbed by the hinge springs 5,5.
There is a problem in that 5, 5 itself is easily damaged and easily detaches from the common terminal.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic relay in which a hinge spring hardly fatigues, has a long life, absorbs and relaxes an impact force, and is hardly damaged.

(Means for Solving the Problems) In order to achieve the above object, an electromagnetic relay according to the present invention has a coil wound around a U-shaped iron core, a permanent magnet disposed in the middle, and a magnetic pole at both ends of the iron core. An electromagnet block for magnetizing the poles, a movable iron piece whose center is mounted on the permanent magnet and serves as a rotation axis, and whose both ends are disposed so as to be able to contact and separate both ends of the iron core. A movable contact piece is integrally formed on the iron piece via an insulating table, and a hinge spring is formed so as to protrude from the center of the side of the movable contact piece, and the tip end of the hinge spring is fixed to a terminal provided on the base. An electromagnetic relay configured to rotate the movable contact piece block about a rotation axis of the movable iron piece and open and close contacts based on excitation and demagnetization of the electromagnet block. Support parts protruding from both sides A hinge spring protrudes from the side surface of the support portion parallel to the rotation axis of the movable iron piece to extend in parallel with the extension direction of the movable contact piece, and a tip end of the hinge spring is formed. ,
This is a configuration that is arranged on an extension line that extends by bending in the direction opposite to the above-described extension direction.

Therefore, according to the present invention, the hinge spring extending from the movable contact piece projects from the side of the support portion of the insulating base parallel to the rotation axis of the movable iron piece, and the movable contact piece extends. It will extend parallel to the direction. For this reason, when the movable contact piece rotates, only the bending moment is applied to the base of the hinge spring,
Since no torsional moment is applied, the hinge spring is less likely to break due to fatigue, and a long-life electromagnetic relay is obtained.

In addition, when a bending process is performed around an axis of rotation with an adjusting jig near the base of the hinge spring protruding from the insulating base to adjust the operation characteristics, only the bending moment is applied to the base of the hinge spring. When, for example, the base of the hinge spring is plastically deformed in the thickness direction by this bending, the entire broken line S indicating the spring load moves vertically in parallel. At this time, the spring load changes due to a single factor, and the amount of displacement of the broken line S is almost directly proportional to the amount of plastic deformation, that is, the amount of bending, so that it is easy to adjust. Therefore, when adjusting the operating characteristics after assembly on the production line, skill can be adjusted quickly and accurately without skill, and fine adjustment of the operating characteristics is easy.

In addition, since the distal end of the hinge spring is on an extension extending in a direction opposite to the above-described extending direction, the distance from the base to the distal end of the hinge spring is long. For this reason, the spring constant of the hinge spring is reduced, and the hinge is easily bent. As a result, the hinge spring easily absorbs and relieves an external impact force, and has an effect that the hinge spring is hardly damaged and is not easily detached from the common terminal.

(Embodiment) An embodiment according to the present invention will be described below with reference to FIGS. 1 to 21.

The electromagnetic relay according to the present invention generally includes a base 10, a movable contact piece block 20, a movable iron piece 30, an electromagnet block 40, base reinforcing members 50 and 60, and a case 70.

The base 10 has a substantially rectangular shape in a plane, and has a shape in which a central portion on a short side is cut off.
1, 12 and a common terminal 13 are insert-molded. Protrusions 14, 14, 14, 14 for positioning an electromagnet block 40, which will be described later, are provided at the four corners of the upper surface, and coil terminal insertion holes are formed in their bases. 15, 15, 16, and 16 are provided. Further, the base 10 is provided with the coil terminal insertion holes 16, 16
A base 17 having a positioning vertical groove 17a at a position adjacent to the base 17
In addition, a welding receiving portion 13a of the common terminal 13 protrudes near the base portion 17. The upper ends of the welding receivers 13a, 13a are bent outward,
It can be adjusted from the side. Further, the base 10 has a fitting recess 18 in the center of the upper surface, the recess 18 has a gas vent hole 18a in the center of the bottom surface, and a pedestal portion 18b having a substantially semicircular cross section near both side edges. , 18b (in FIG. 1, the pedestal portion on the near side is not shown).

Next, as a method of forming the base 10, for example, as shown in FIGS. 5 and 6, a fixed contact which is connected and integrated by a hatched lead frame 80 and Π-shaped connecting members 81, 81 is used. The terminals 11, 12 and the common terminal 13 are insert-molded, and the fixed terminals 11, 12 and the common terminal 13 are formed after molding.
Is cut off from the lead frame 80 and bent downward, and the connecting members 81, 81 are cut off (FIG. 6), so that the adjusting tongue piece 11b is attached to the distal ends of the fixed terminals 11, 12 provided with the fixed contacts 11a, 12a. , 12b are formed. This tongue piece 11b, 12b
Is adjustable and protrudes from the side end surface of the base 10 and is narrow, so that the adjustment jig can be easily inserted.

The base 10 is separated from the lead frame 80 after the internal components are assembled and the operation characteristics inspection and adjustment work is completed.

In addition, it is needless to say that the tips of the fixed contact terminals 11 and 12 may project from the flush side end face of the base.

As shown in FIGS. 7 to 10, the movable contact piece block 20 is formed by insert-molding a central portion of a pair of movable contact pieces 22 and 23 arranged side by side on an insulating table 21 made of synthetic resin. The insulating base 21 is provided with through holes 24, 24 for secondary molding in the center of the insulating base 21, and the supporting parts 25, 25 projecting upward at opposite side edges of the insulating base 21.
Is provided.

On the other hand, the movable contact pieces 22 and 23 are formed by stamping a conductive thin plate. Both ends are divided into two in the width direction, and the movable contacts 22a and 23a are fixed to the lower surface of one end. At the same time, the movable contact 22b,
23b is fixed to each. Further, the movable contact pieces 22, 23
Has side-to-side extending portions 22c and 23c that extend from substantially the center of the long side. The hinge springs 2 extending laterally from the upper ends of the rising portions 22c and 23c.
6, 26, among the side surfaces of the support portions 25, 25, projecting from the rotation axis of the movable contact pieces 22, 23, that is, the side surfaces parallel to the rotation axis of the movable iron piece 30 described below, The movable contact pieces 22 and 23 extend substantially parallel to the extending direction. Further, the welded portion 26a located at the distal end of the hinge spring 26 is located at a position where it is bent and extended in a direction opposite to the above-mentioned protruding direction, and the positioning arm 27 extends along an extension of the welded portion 26a.

As shown in FIGS. 11 and 12, the movable iron piece 30 is made of a plate-like material having a substantially rectangular shape in a plane, and is provided with a bulging portion 31 by protruding the center portion thereof, and the ridge portion 31a is rotated by a rotating shaft. Have a heart. Further, through holes 32 for insert molding are provided at positions facing each other with the bulging portion 31 interposed therebetween. Further, a magnetic shield 33 is attached and integrated to one end of the upper surface of the movable iron piece 30.

Then, as shown in FIG. 13 to FIG.
30 is positioned between the support portions 25, 25 of the movable contact piece block 30, and the through holes 32, 32 and the through holes 24, 24 of the insulating base 21 overlap and communicate. Further, by subjecting them to secondary insert molding to form a connecting body 34 having a substantially U-shaped cross section, the movable contact piece block 20 and the movable iron piece 20 are formed.
30 is integrated.

Next, the insulating base 21 of the movable contact piece block 20 is
After the positioning arm 27 of the hinge spring 26 is slid into the positioning vertical groove 17a of the base 10 and positioned, the welding portion of the hinge spring 26 is fitted.
26a is welded to the welding receiving portion 13a of the common terminal 13, so that the welding portion 26a of the hinge spring 26 and the ridge 31a of the movable iron piece 30 are formed.
Are arranged on substantially the same plane. Even when the movable contact piece block 20 rotates, only the bending moment is applied to the base of the hinge spring 26, and no torsional moment is applied.

The electromagnet block 40 has a substantially E-shaped cross-section formed by arranging a permanent magnet 42 on an iron core 41 having a substantially U-shaped cross-section, and insert-molding the same into a spool 43.
a is exposed from the lower surface of the central flange portion 43a of the spool 43, while the left magnetic pole portion 41a of the iron core 41 is
And the right magnetic pole of the iron core 41
41b is exposed from the lower surface of the flange 43c of the spool 43. Then, coil terminals 44, 44 and 45, 45 are insert-molded on the flanges 43b, 43c of the spool 43, respectively, and further wound around the spool 43 around the barbs 44a, 44a of the coil terminals 44, 44. The lead wires of the coil 46 are tied and soldered.

And, the electromagnet block 40 has coil terminals 44, 44, 4
5, 45 are inserted into the coil terminal holes 15, 15, 16, 16 of the base 10, respectively, and a solvent adhesive is appropriately injected between the flanges 43a, 43b, 43c and the base 10, thereby being integrally fixed. You.

As a result, the bulging portion 31 of the movable iron piece 30 is
The magnetic pole portion 42a of the movable member 40 attracts and is rotatably held, and the rotational axis of the movable iron piece 30 and the rotational axes of the movable contact pieces 22 and 23 are located on the same plane.

At this stage, the operating characteristics of the electromagnetic relay are inspected,
If the predetermined operating characteristics are not obtained, for example, the tongue pieces 11b and 12b of the fixed contact terminals 11 and 12 protruding from the side end surfaces of the base 10 are twisted by an adjustment jig (not shown), and a broken line S which is a load curve
It can be adjusted so that the straight portions S ₁ and S ₂ on both sides (see FIG. 18) are located between predetermined suction force curves.

However, the force on the vertical axis in FIG. 18 indicates the magnitude of the magnetic attraction force and the spring force, and the stroke on the horizontal axis indicates the distance between both ends of the movable iron piece and the magnetic pole of the iron core. Furthermore, the right end of the horizontal axis indicates the case where the movable iron piece is in the return state, the left end thereof indicates the case where the movable iron piece is in the operating state, and the center portion of the movable iron piece is located at either end of the iron core. Also indicates that it is in a neutral state where it is not in contact. The broken line S indicates the spring force of the hinge spring of the movable contact piece. The reason why both sides of the broken line S are bent and the inclination angle is increased is that the movable contact comes into contact with the fixed contact, the distance between the fulcrums becomes shorter, and the spring constant becomes larger. Therefore, the middle area of the polygonal line S shows a case where the movable contact piece is in a free state.

Further, the welding receiving portion 13a of the common terminal 13 protruding from the upper surface edge of the base 10 may be adjusted in the same manner as described above.

Further, a hinge spring protruding from the support portion 25 of the insulating table 21
When bending is performed around the rotation axis with an adjustment jig (not shown) near the base of the hinge 26, only the bending moment is applied to the base of the hinge spring 26. When, for example, the base of the hinge spring 26 is plastically deformed in the thickness direction by this bending, the entire broken line S shown in FIG. 18 moves vertically in parallel. At this time, the spring load changes due to a single factor, and the amount of displacement of the broken line S is almost directly proportional to the amount of plastic deformation, that is, the amount of bending, so that it is easy to adjust. For this reason, when adjusting operating characteristics after assembly on a production line, there is an advantage that skill can be adjusted quickly and accurately without skill, and fine adjustment of operating characteristics is facilitated.

Adjustment of the fixed contact terminals 11 and 12, the welding receiving portion 13a, and the hinge spring 26 as described above is performed when the assembly of the internal components such as the electromagnet block 40 is temporarily completed to obtain a desired magnetic attractive force characteristic. Therefore, direct adjustment of the electromagnet block 40 takes time and is extremely difficult in practice.

After the adjustment work is completed, the electromagnetic relay, which is a semi-finished product being assembled, is separated from the lead frame 80 (FIG. 17).

The base reinforcing members 50 and 60 each have a shape that can be fitted to the lower surface edge of the base 10, and the coil terminal holes 51, 51 and 61, 61 of the electromagnet block 40 projecting from the lower surface of the base 10. Along with inserting into the coil terminals 44, 44 and 45, 45, respectively, positioning recesses 52, 52 and 62,
Positioning projections 10a, 10a projecting 62 from the lower surface of base 10
(The positioning protrusions on the back side are not shown.).

The case 70 has a box shape that can be fitted to the base 10. The case 70 is fitted to the base 10, and a sealing agent 90 is injected and solidified into a concave portion 71 (FIG. 3) formed on the back surface of the base 10. The assembling operation is completed by extracting the internal gas from the gas vent hole 18a of the base 10 and thermally melting and sealing the gas vent hole 18a.

Next, the operation of the electromagnetic relay having the above-described configuration will be described.

In the case of non-excitation, the magnetic flux of the permanent magnet 42 (shown by a dotted line in FIG. 19) attracts the right end 30b of the movable iron piece 30 to the right magnetic pole 41b of the iron core 41 to close the magnetic circuit. I have. For this reason, the movable contacts 22a and 23a of the movable contact pieces 22 and 23 are
a, 11a, while movable contacts 22b, 23b are fixed contacts
It is separated from 12a, 12a.

Next, as shown in FIG. 20, when a voltage is applied to the coil 46 so as to generate a magnetic flux (indicated by a dashed line) that cancels the magnetic flux, the coil 46 is excited, and the left end 30a of the movable iron piece 30 is
Is attracted to the left magnetic pole part 41a of the movable iron piece 30 against the magnetic force of the permanent magnet 42, the movable iron piece 30 rotates about the ridgeline part 31a as a rotation axis, and the right end 30b of the movable iron piece 30 Right magnetic pole 41b
Then, the left end portion 30a of the movable iron piece 30 is attracted to the left magnetic pole portion 41a of the iron core 41 (FIG. 21). Therefore, after the movable contacts 22a, 23a of the movable contact pieces 22, 23 are separated from the fixed contacts 11a, 11a, the movable contacts 22b, 23b contact the fixed contacts 12a, 12a.

Then, when the excitation of the coil 46 is released, the movable contact piece 2
The movable iron piece 30 is formed by an unbalance of a return force and a magnetic force based on the spring force of the hinge springs 2 and 23 and the spring force of the hinge springs 26 and 26.
Returns to the original position, the movable contacts 22a and 23a and 22b and 23b are switched, and returns to the original state.

In this embodiment, the case of the self-return type has been described. However, the present invention is not necessarily limited to this, and the shape of the iron core 41, the spring force of the movable contact pieces 22 and 23, and the like may be adjusted to be a self-holding type. Good.

[Brief description of the drawings]

1 to 21 show an embodiment of the electromagnetic relay according to the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a plan sectional view, FIG. 3 is a front sectional view, and FIG. Sectional view, fifth
FIGS. 6 and 7 are plan views for explaining a molding process of the base, FIGS. 7 to 10 show movable contact piece blocks, FIG. 7 is a plan view, FIG. 8 is a front view, and FIG. Is a bottom view, FIG. 10 is a right side view, FIGS. 11 and 12 are a plan view and a front view of a movable iron piece, and FIGS. 13 to 16 are drawings in which a movable contact piece block and a movable iron piece are integrated. Shows, FIG. 13 is a plan view, FIG. 14 is a partial cross-sectional front view, FIG. 15 is a bottom view,
FIG. 16 is a partial cross-sectional view of the right side surface, FIG. 17 is a perspective view showing an electromagnetic relay being assembled, FIG. 18 is a graph showing a load curve of operation characteristics, and FIGS. FIG. 22 is a plan view showing components of one embodiment of an electromagnetic relay according to a conventional example. Reference numeral 10: Base, 13: Common terminal, 13a: Weld receiving part, 20: Movable contact piece block, 21: Insulating stand, 22, 23: Movable contact piece, 2
5 ... Supporting part, 26 ... Hinge spring, 26a ... Welding part, 30 ... Movable iron piece, 31a ... Ridge part, 40 ... Electromagnetic block, 41 ... Iron core, 41
a, 41b: magnetic pole, 42: permanent magnet, 46: coil.

Continuing on the front page (72) Inventor Masayuki Noda 10 Tatemachi, Hanazono-cho, Ukyo-ku, Kyoto, Kyoto Prefecture (56) References JP-A-2-78126 (JP, A) JP-A-59-8233 (JP, A) JP-A-59-114721 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. An electromagnet block in which a coil is wound around a U-shaped iron core, a permanent magnet is arranged in the middle, and both ends of the iron core are magnetized to the same polarity, and a center is placed on the permanent magnet. A movable iron piece whose both ends are disposed so as to be able to contact and separate from both ends of the magnetic core of the iron core, and a movable contact piece is integrally formed on the movable iron piece via an insulating base. A hinge spring protrudes from the center of the side of the contact piece, and comprises a movable contact piece block having a tip end portion of the hinge spring fixed to a terminal provided on a base. The movable contact piece block is actuated based on excitation and demagnetization of the electromagnet block. In an electromagnetic relay for rotating the movable contact piece block about a rotation axis of the iron piece and opening and closing a contact, a support portion protruding from both sides of the insulating base is formed, and a movable portion of the side surface of the support portion is formed. From the side parallel to the axis of rotation of the iron piece The hinge spring is projected so as to extend in parallel with the direction in which the movable contact piece extends, and the distal end of the hinge spring is disposed on an extension extending in a direction opposite to the above-described extension direction. And an electromagnetic relay.