JP3350947B2 - 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, and more particularly to a structure for supporting a movable iron piece.

[0002]

2. Description of the Related Art A conventional electromagnetic relay is disclosed, for example, in Japanese Utility Model Laid-Open No. 63-143841. That is, one end of the movable iron piece is rotatably hinged to one of the magnetic pole surfaces of the iron core having a substantially U-shaped cross section around which the coil is wound, via a hinge spring bent in a substantially rectangular shape. An electromagnetic relay that supports and opens and closes contacts by rotating the movable iron piece by attracting and separating the other end of the movable iron piece to the other magnetic pole surface of the iron core based on excitation and demagnetization of the coil. It is.

[0003]

However, in the above-mentioned electromagnetic relay, the bent portion of the hinge spring is cut into a frame shape so as to secure desired operating characteristics, and the two hinge springs that are left uncut are cut out. The movable arm is rotatably supported by the thin arm. Therefore, the supporting force of the hinge spring on the movable iron piece is small. As a result, one end of the movable iron piece that serves as a rotation fulcrum easily moves on the magnetic pole surface of the iron core.
Operating characteristics are unstable. In addition, since the hinge spring has a weak supporting force on the movable iron piece, the hinge spring is likely to be plastically deformed when an external impact force is applied. In the worst case, the end of the movable iron piece contacts the inner surface of the case. There is a problem that operation becomes impossible due to contact.

[0004] In view of the above problems, an object of the present invention is to provide an electromagnetic relay having stable operation characteristics and excellent shock resistance.

[0005]

In order to achieve the above object, an electromagnetic relay according to the present invention has a frame-like hinge spring bent in a substantially rectangular shape on one magnetic pole surface of an iron core around which a coil is wound. The other end of the movable iron piece is attracted to and separated from the other magnetic pole surface of the iron core based on the excitation and demagnetization of the coil, so that the movable iron piece is rotatably hinged at one end of the movable iron piece via the coil. In an electromagnetic relay that rotates an iron piece and opens and closes a contact, a card supported so as to be able to reciprocate in the axial direction is engaged with the other end of the movable iron piece, while the movable iron piece is energized when the coil is excited. A position regulating tongue which abuts on a hinge-supported one end, and which faces the one end of the movable iron piece with a gap therebetween when the coil is demagnetized, and which is positioned on the iron core side of the hinge spring; And adjacent to the pole face of the iron core It is obtained by a structure in which is pressed against the outer surface edge to.

[0006]

Therefore, according to the present invention, the position regulating tongue extending from the hinge spring abuts against one end of the movable iron piece to regulate the position in the longitudinal direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the electromagnetic relay according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the electromagnetic relay generally includes a base 1, a coil block 20, a movable iron piece 35, a card 40, a contact opening / closing mechanism 50, and a case 55.

The base 1 has a first housing portion 2 opening upward and laterally, and a second housing portion 15 located below the first housing portion 2 and opening on the opposite side and end face.
And

Notches 5 and 5 are provided at the center of the side edges of both end surfaces 3 and 4 of the first housing portion 2, respectively. By providing a step portion 6 on the one end surface 3, a first guide portion 7 having a recess 8 opening toward the back side in FIG. 1 is formed, and the first guide portion 7 is provided. A second guide portion 9 is provided on the step portion 6 so as to face at a predetermined interval. Further, the lower end surfaces of the guide portions 7 and 9 serve as stopper portions 10 and 10 for preventing vibration when the movable contact piece 52 described later returns. In addition, a concave portion 11 is formed at the upper end of the end face 3 by cutting out the side edge portion. In the end face 3, a portion located below the cutout portion 5 is provided with a concave portion 3 a for preventing the sealing material from flowing.

A ridge 16 is formed on the opening side of the end face of the second housing portion 15, and a side edge on the opening side is cut out to the ridge 16 to form a locking receiving portion 17. Further, a fixed contact piece 5 described later is provided on the end face 4 side in the second accommodation portion 15.
Press-fit grooves 18 and 19 for press-fitting and fixing the movable contact piece 1 and the movable contact piece 52 are formed respectively.

The coil block 20 is formed by winding a coil 31 around an iron core 21 having a substantially U-shaped cross section via a spool 22, and has flange portions 2 located at both ends of the spool 22.
Coil terminals 30 and 30 are insert-molded on the first and second legs 26 and 28 provided on one of the flanges 23 (the flange 23).

The first leg 26 protrudes from the flange 23, and a positioning projection 27 is formed above the first leg 26. On the other hand, the second leg 28 protrudes from the flange 23 and extends downward, and a locking portion 29 for locking to the locking receiving portion 17 of the base 1 is protruded from a lower edge thereof. . Further, a concave portion 28a for preventing the sealing material from flowing in is provided below the second leg portion 28, and a round surface is formed in the outer corner portion 28b for the same reason. A groove 25 is formed on the side surface of the flange 23 located near the second leg 28 so that the winding start side of the coil 31 is arranged.

The movable iron piece 35 is a plate-like body made of a magnetic material, and has a protrusion 36 at one end and a substantially rectangular shape attached to the flange 24 of the coil block 20 at the other end. A frame-shaped hinge spring 37 is attached. The hinge spring 37 extends a position restricting tongue piece 38 for restricting the position by contacting one end of the movable iron piece 35.

The card 40 is a plate made of synthetic resin.
A pair of elastic pieces 41, 41 facing each other are provided at the upper end so that the protrusion 36 of the movable iron piece 35 can be held.
It has become. Further, locking claws 43 extend on both sides from the lower end of the card 40, and a projection 44 is provided at the center thereof. The narrow portion 42 of the card 40 is guided by the guide portions 7 and 9 of the base 1, and the upward movement of the card 40 is restricted by the stopper portions 10 and 10.

The contact opening / closing mechanism 50 comprises a fixed contact piece 51 and a movable contact piece 52, both of which are mounted by press-fitting the base into the press-fitting grooves 18, 19 from the side of the base 1. The movable iron piece 35 and the movable contact piece 52 are connected by engaging the projection 44 of the card 40 with the through hole 53 provided at the free end of the movable contact piece 52.

Next, a method of assembling the electromagnetic relay having the above configuration will be described. First, the second storage unit 1 of the base 1
5, fixed contact piece 51 and movable contact piece 5 from the side.
2 and press-fit the bases thereof into the press-fit grooves 18 and 19 to fix the movable contacts 51a and the fixed contacts 52a at predetermined intervals.

When the coil block 20 is housed in the second housing portion 2 of the base 1, the coil block 2
0 is located in the concave portion 11 of the base 1 and the first
The leg 26 is located in the recess 8 provided on the side of the first guide 7, and the second leg 28 is located on the side of the second guide 9, and a locking portion 29 provided on the lower end thereof. Is locked to the locking receiving portion 17 of the base 1. Then, the flange 2 of the coil block 20
By inserting and fixing a hinge spring 37 provided on the movable iron piece 35 into a gap formed between the inner surface of the base 1 and the movable iron piece 35, the movable iron piece 35 is rotatably hinged.

Subsequently, the elastic pieces 41, 41 of the card 40 are engaged with the projections 36 of the movable iron piece 35, and the projections 44 of the card 40 are engaged with the through holes 53 of the movable contact piece 52, respectively. The movable iron piece 35 and the movable contact piece 52 are connected via the card 40 (see FIG. 4). Thereby, the card 40 is located between the first and second guide portions 7 and 9 provided on the base 1, and the narrow portion 42 is guided by the two guide portions 7 and 9.

At this time, as shown in FIG. 3, the position regulating tongue 38 provided on the hinge spring 37 is connected to the magnetic pole surface 2 of the iron core 21.
It protrudes while being pressed against the outer surface edge adjacent to 1a. Therefore, even if the movable iron piece 35 attempts to move in its length direction, the tongue piece 38 prevents the movable iron piece 35 from being displaced, so that the operating characteristics are stabilized. In particular, since the tongue piece 38 absorbs and relaxes the impact energy even when an impact force is applied from the outside, there is an advantage that the plastic deformation of the hinge spring 37 is eliminated, and a situation in which the hinge spring 37 becomes inoperable can be prevented.

Next, the case 55 is fitted to the base 1 on which all the internal components are assembled, and after the case 55 is turned over, a sealing material is injected into the bottom surface of the base 1 and solidified to form an electromagnetic relay. Is completed.

In this embodiment, when the sealing material is injected from the bottom surface of the base 1, the sealing material tends to penetrate deep inside from the gap between the outer surface of the base 1 or the spool 22 and the inner surface of the case 55. The intrusion of the sealing material is prevented by the concave portion 3a provided in the first and the concave portion 28a provided in the second leg 28 of the spool 22. Further, even if the sealing material enters along the outer surface of the second leg 28 adjacent to the concave portion 28a, the rounded surface is formed at the corner 28b (FIG. 2), so that the sealing material wraps around. No intrusion. For this reason, there is an advantage that the sealing material does not adhere to the internal movable parts, and no malfunction occurs.
The corner 28b is not limited to a round surface, but may have a chamfered shape.

In the electromagnetic relay, when the coil block 20 is in a non-excited state, the movable iron piece 35 is moved by the urging force of the hinge spring 37 to the magnetic pole surface 21a of the iron core 21 as shown in FIG.
Is pivoted clockwise around the fulcrum, and the card 40
Is located above, the movable contact piece 52 maintains a straight state, and the movable contact 52a is separated from the fixed contact 51a.

When the coil block 20 is excited, the free end of the movable iron piece 35 is moved to the magnetic pole face 21b of the iron core 21.
To rotate counterclockwise. This allows
The card 40 moves downward while being guided by the first and second guide portions 7 and 9. Then, the movable contact piece 52 is bent, and the movable contact 52a is
Contact 1a.

Subsequently, when the coil block 20 is demagnetized, the movable iron piece 35 rotates clockwise by the urging force of the hinge spring 37 and returns to the original position. As a result, the card 40 moves upward while being guided by the first and second guide portions 7 and 9, and the locking claw 4
3, 43 abut against the lower end surfaces of the first and second guide portions 7, 9, that is, the stopper portion 10. As a result,
The movable contact piece 52 returns to the original state without vibrating, and the movable contact 52a is separated from the fixed contact 51a.

Thus, the excitation of the coil block 20
The card 40 moves as the movable iron piece 35 rotates based on the demagnetization. The card 40 moves while being guided by the first and second guide portions 7 and 9 provided on the base 1 at all times. On the other hand, the movable contact piece 52 is
, The card 40 moves accurately with respect to the movable contact piece 52 fixed to the base 1.

Although the movable iron piece 35 is rotated above the coil block 20 in this embodiment, it may be rotated below or beside the coil block 20. The guides 7 and 9 are provided at corresponding positions on the base 1.

[0027]

As is apparent from the above description, according to the electromagnetic relay of the present invention, the tongue for regulating the position of the hinge spring comes into contact with one end of the movable iron piece when the coil is excited, and Since the displacement in the length direction is prevented, the rotation fulcrum does not largely change, and the operation characteristics are stabilized. In particular, since the tongue for position control is pressed against the edge of the pole face of the iron core,
The positioning tongue can be positioned with high positioning accuracy.
For this reason, even if one end of the movable iron piece abuts on the position regulating tongue at the time of exciting the coil, the movable iron piece can be positioned with high positioning accuracy, and the operating characteristics are further stabilized. Further, even if an external impact force is applied, the tongue piece absorbs and relaxes the impact force, so that the plastic deformation of the hinge spring is eliminated, and a situation in which the hinge spring becomes inoperable can be prevented. One end of the movable iron piece is engaged with a card supported so as to be able to reciprocate in the axial direction, but the other end of the movable iron piece comes into contact with the position regulating tongue of the hinge spring when the coil is demagnetized. Not. That is, the movable iron piece has a slight escape, and has a certain degree of freedom. As a result, even if the movable iron piece rotates based on the excitation and demagnetization of the coil, the movable iron piece rotates smoothly, and desired operating characteristics can be secured. Further, since the movable iron piece and the position restricting tongue piece of the hinge spring do not rub strongly, there is an effect that an electromagnetic relay with less generation of abrasion powder can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of an electromagnetic relay according to the present invention.

FIG. 2 is a plan sectional view showing one embodiment of the electromagnetic relay according to the present invention.

FIG. 3 is a front sectional view showing one embodiment of the electromagnetic relay according to the present invention.

FIG. 4 is a side sectional view showing one embodiment of the electromagnetic relay according to the present invention.

[Explanation of symbols]

21: iron core, 21a, 21b: magnetic pole surface, 31: coil,
35: movable iron piece, 37: hinge spring, 38: tongue piece for position control, 40: card.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Nishi 10 Okado Dodocho, Ukyo-ku, Kyoto, Kyoto Prefecture (56) References JP-A-62-183030 (JP, A) 15135 (JP, U) Actually open 63-143841 (JP, U) Actually open 60-183348 (JP, U) Actually open 1-142133 (JP, U) Actually open 64-1644 (JP, U) Japanese Utility Model Application Hei 4-59039 (JP, U) Japanese Utility Model Application Hei 4-96945 (JP, U) Japanese Utility Model Application Hei 4-136847 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H01H 50/00-51/36

Claims (1)

(57) [Claims] An end of a movable iron piece is rotatably hinge-supported on one magnetic pole surface of an iron core around which a coil is wound, via a frame-shaped hinge spring bent in a substantially rectangular shape. An electromagnetic relay that turns the movable iron piece to open and close a contact by attracting and separating the other end of the movable iron piece to the other magnetic pole surface of the iron core based on the excitation and demagnetization of the movable iron piece; While the end is engaged with a card supported so as to be able to reciprocate in the axial direction, it contacts the hinge-supported one end of the movable iron piece when the coil is energized, and moves when the coil is demagnetized. A position regulating tongue facing the one end of the iron piece with a gap therebetween extending from one end located on the iron core side of the hinge spring, and an outer surface edge adjacent to the magnetic pole surface of the iron core An electromagnetic relay characterized by being pressed against a part.