JPH0845407A - Structure of electromagnetic relay - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of the head position of the iron core of a yoke by forming a projection around a through-hole for fitting of the iron core. CONSTITUTION:A bobbin 12 has a cylindrical section 12a with a coil 5 wound around, and is adjacent to a yoke 1. An iron core 4 has a large diameter section 4b inserted in the cylindrical section 12a of the bobbin 12. Also, the core 4 has a head section 4a at one end for engagement with the open end of the section 12a, and a small diameter section 4c at the other end for insertion and fixing in the through-hole 1b of the yoke 1 via caulking, with a step section 4d formed between the sections 4b and 4c. The yoke 1 has a recess 1d or a projection 1c with a through-hole 1b at a center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electromagnetic relay in which the position of an iron core can be easily adjusted.

[0002]

2. Description of the Related Art Conventionally, as this type of technique, for example, there is a technique disclosed in Japanese Utility Model Laid-Open No. 186040/1988. In this technique, a thread portion is formed in the iron core and a screw hole is formed in the yoke so as to be screwed into the thread portion, so that the length from the yoke to the free end portion of the iron core can be adjusted.

[0003]

However, the above-mentioned prior art is to adjust the position of the free end of the iron core by screwing the threaded portion of the iron core to the yoke and the threaded portion of the iron core. The iron core is easy to move and there is a problem with durability. Further, since the iron core and the yoke have the threaded portion, the number of working steps and the number of assembling steps increase, which causes a cost increase.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-mentioned problems of the prior art, and has a bobbin having a tubular portion around which a coil is wound and adjacent to a yoke. A large-diameter portion inserted into the tubular portion of the bobbin at the central portion, a head portion locked at the open end of the tubular portion of the bobbin at one end, and a small-diameter portion that is fixed by swaging through the through hole of the yoke at the other end. And an iron core having a stepped surface formed between the large-diameter portion and the small-diameter portion, and a yoke having a recess formed in the center of the through hole or a protrusion, and the protrusion of the protrusion. ,
The position of the head of the iron core is adjusted, and the structure of the electromagnetic relay having excellent durability is provided.

Further, the present invention adjusts the position of the head of the iron core by arranging the protrusions or depressions of the yoke so as to face the stepped surface of the iron core, and to adjust the position of the head of the iron core against vibrations and shocks. And a durable electromagnetic relay structure.

Further, according to the present invention, by forming a counterbore into which the protrusion of the yoke is loosely fitted, at the opening end on the yoke side of the cylindrical portion of the bobbin, the protrusion protrusion adjustment work for adjusting the position of the head of the iron core. To facilitate.

[0007]

【Example】

First Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. Reference numeral 1 denotes an L-shaped yoke made of metal, one end of which supports an armature 2 swingably, and the other end of which is insert-molded on a pole plate 3.

The armature 2 is made of a metal plate material, the upper end of which is oscillatably hooked on one end of the yoke 1, the lower end of which is arranged in the vicinity of the iron core 4 and is attracted to the iron core 4 by the coil 5. . In the armature 2, when no current is flowing through the coil 5, the fixed leaf spring 7 is pressed against the fixed contact 8 so that there is a gap of length S between the armature 2 and the head 4a of the iron core 4. P is a swinging fulcrum of the armature 2 with which the armature 2 and the yoke 1 are in contact. The distance from the swing fulcrum P of the armature 2 to the surface of the head 4a of the iron core 4 is a length L. The armature 2 has a leaf spring 7 to which the movable contact 6 is fixed, which is fixed by swaging, and is held by the leaf spring 7 so as to be swingable.

The pole board 3 is insert-molded with the terminal 1a of the yoke 1, the terminal 9 to which the fixed contact 8 is fixed, and the terminal 11 to which the fixed contact 10 is fixed.

The iron core 4 has a large diameter portion 4b in the center, a head portion 4a at one end on the armature 2 side, and a small diameter portion 4c at the end portion on the yoke 1 side. The iron core 4 has a large diameter portion 4b fitted in the cylindrical portion 12a of the bobbin 12 and a small diameter portion 4c fixed to the through hole 1b of the yoke 1 by caulking. The iron core 4 has a stepped surface 4d between the large diameter portion 4b and the small diameter portion 4c, which is in contact with the recess 1d. The head 4a projects from the side surface of the bobbin 12, and a part of the head 4a is immersed in the spot facing 12d.

As shown in FIG. 3 (a), the periphery of the through hole 1b is press-molded with a substantially link-shaped projection 1c which is projected outward from the bobbin 12 side of the yoke 1 by a punch 13. The depression 1d is the projection 1c formed during this press molding.
Is the back side of. The inner diameter R1 of the recess 1d is slightly longer than the diameter R2 of the large diameter portion 4b as shown in FIG. The protrusion 1c
After the bobbin 12 is swaged and fixed to the yoke 1 by the iron core 4, and the head 4a is located outside the predetermined position, the punch 13 presses the protrusion 1c as shown in FIG. The height S and the length L are adjusted to desired values by adjusting the height of the.

The leaf spring 7 has one end fixed to the yoke 1, the fixed contact 8 fixed to the bobbin 12 side at the other end, and the central portion fixed to the armature 2. The lower end of the leaf spring 7 contacts the fixed contact 8 when no current is flowing through the coil 5. When an electric current is flowing through the coil 5, the leaf spring 7
The movable contact 6 fixed to the leaf spring 7 contacts the fixed contact 10.

The bobbin 12 has a coil 5 wound around the outer periphery of a tubular portion 12a, and the iron core 4 is inserted into the tubular portion 12a.
The bobbin 12 has a notch 12c that engages with the terminal 11 on the outside of the lower end of the collar 12b on the side of the armature 2. The bobbin 12 has, for example, a counterbore 12d having a circular shape, in which the head 4a is substantially half recessed, at the open end of the cylindrical portion 12a in which the head 4a is disposed. On the bottom surface of the spot facing 12d, a triangular convex portion 12e is formed in pressure contact with the back surface of the head portion 4a.

The present invention has the above-mentioned structure, and the operation will be described in detail below with reference to FIGS. 1 to 3.

Before the insert molding on the pole plate 3 of the yoke 1, as shown in FIG. 3, the projections 1c and the recesses 1d are formed by pressing with the punches 13. The protrusion 1c is the yoke 1
Since it protrudes from the side surface, the surface can be easily adjusted by pressing the surface with the punch 13 or the like.

When the bobbin 12 is fixed to the yoke 1 insert-molded on the pole plate 3, the iron core 4 is inserted into the cylindrical portion 12a and the small diameter portion 4c is fitted into the through hole 1b. Then, the surface of the small diameter portion 4c is swaged with a punch (not shown) or the like to fix the small diameter portion 4c to the protrusion 1c. During this caulking and fixing work, the convex portion 12e is pressed against the back surface of the head portion 4a and the tip is crushed. As a result, the iron core 4 and the bobbin 12 are fixed to the yoke 1 without backlash.

After the iron core 4 is assembled to the yoke 1, the yoke 1
The distance L from the rocking fulcrum P to the surface of the head 4a is measured. When the distance L is shorter than a predetermined dimension, as shown in FIG. 3B, the height H of the protrusion 1c is adjusted by pressing the surface of the protrusion 1c with the punch 13 or the like. Iron core 4 is punch 1
3 and the depression 1d on the back surface of the protrusion 1c to move to the amateur 2 side, and the distance L is adjusted.

When the distance L is longer than a predetermined size, the head 4
The surface of a is pressed by the punch 13 or the like. The iron core 4 moves to the yoke 1 side by the punch 13, and the step surface 4d presses the depression 1d to adjust the distance L. At this time, the bobbin 12
With the movement of the head 4a, the convex portion 12e is further crushed, and a large load is not applied.

As a result, the distance L from the swinging fulcrum P of the yoke 1 to the surface of the head 4a can be easily adjusted because the projection 1c is easily deformed, and the variation of the operating voltage of the electromagnetic relay can be eliminated, and The quality of the electromagnetic relay can be improved. Therefore, even if the distance L is the bobbin 12 that is out of the standard,
All items can be adjusted and used effectively without waste.

Since the length S of the distance L from the center of the head 4a to the armature 2 in the lateral direction can be accurately adjusted as described above, the distance S to be adjusted thereafter can be accurately adjusted. And easy to do.

Second Embodiment Next, a second embodiment of the present invention will be described in detail with reference to FIG. In the second embodiment of the present invention, the protrusion 1c and the depression 1d of the yoke 1 of the first embodiment described above are formed on the opposite side, and the bobbin 1
A counterbore 14c is formed at the opening end of the second tubular portion 12a on the yoke 1 side. Hereinafter, the same members as those in the first embodiment are designated by the same reference numerals and characters, and the description thereof will be omitted.

In FIG. 4, reference numeral 14 denotes a bobbin in which counterbore 14b and 14c are formed at both open ends of the cylindrical portion 14a.
The bobbin 14 is fixed by inserting the iron core 4 into the cylindrical portion 14a, fitting the small diameter portion 4c into the through hole 15a of the yoke 15, and caulking.

The counterbore 14b on the side of the amateur 2 is a stepped hole into which approximately half the head 4a is recessed. York 1
The counterbore 14c on the 5 side is the protrusion 1 protruding toward the bobbin 14 side.
5b is a stepped hole into which the ball is loosely fitted. The depth a of the spot facing 14c is made longer than the height H of the protrusion 15b so that the position of the protrusion 15b can be moved and adjusted when the depression 15c is pressed by a punch or the like.

The yoke 15 is press-formed with a protrusion 15b on the bobbin 14 side and a recess 15c on the outside, which is symmetrical with the first embodiment of the present invention. The protrusion 15b is in contact with the step surface 4d. The surface of the projection 15b may be formed with what corresponds to the projection 12e of the bobbin 12 described in detail in the first embodiment.

The second embodiment of the present invention is configured as described above and has the same operation and effect as the first embodiment. That is, the distance L from the swinging fulcrum P of the yoke 15 to the surface of the head 4a is easily deformed by pressing the recess 15c of the yoke 15 and the head 4a of the iron core 4 with the punch 13 or the like. Then, the height H is adjusted to obtain a desired length.

[0026]

Since the present invention is constructed as described above, it has the following effects. (1) According to the present invention, a large diameter portion is inserted into the cylindrical portion of the bobbin at the center, a head is engaged with the open end of the cylindrical portion of the bobbin at one end, and the other end is inserted into a through hole of the yoke to be added. It is composed of an iron core having a small-diameter portion that is fastened and fixed, and a step surface formed between the head portion and the small-diameter portion, and the yoke having a recess or a protrusion formed at the center of the through hole. The head position of the iron core or the protrusion of the yoke can be pressed to adjust the retracted position of the head, and the adjusted position of the iron core does not shift due to backlash or impact, and has excellent durability. There is. (2) In the present invention, the protrusions or depressions of the yoke are arranged so as to face the stepped surface of the iron core, so that the protruding / retracted position of the head of the iron core can be easily adjusted. (3) The present invention is characterized in that the opening end on the yoke side of the tubular portion of the bobbin is
By forming the spot facing where the protrusion of the yoke is loosely fitted,
When the head of the iron core or the protrusion is pressed to adjust the position of the head, a large load is not applied to the bobbin. (4) According to the present invention, the distance from the swinging fulcrum of the yoke to the surface of the head can be easily adjusted because the protrusion easily deforms,
It is possible to eliminate variations in the operating voltage of the electromagnetic relay and improve the quality of the electromagnetic relay. Therefore, even if the distance is a bobbin that is out of the standard, it can be adjusted and used effectively without waste. (5) According to the present invention, since the distance from the swing fulcrum of the yoke to the surface of the head can be adjusted, the distance from the center of the head of the iron core to the armature in the lateral direction can be easily and accurately adjusted. Can be adjusted.

[Brief description of drawings]

FIG. 1 is a front view with a partial cross section showing a first embodiment of the present invention.

FIG. 2 is a drawing showing a first embodiment of the present invention and is a perspective view of a yoke.

FIG. 3 is a view showing a first embodiment of the present invention, (a)
1 of the yoke showing the state when the protrusion is formed by the punch
The side view which has a partial cross section, (b) is a side view which has a partial cross section in a yoke which shows the state when adjusting the position of the head of an iron core.

FIG. 4 is a cross-sectional view of essential parts showing a second embodiment of the present invention.

[Explanation of symbols]

 1, 15 Yoke 1b, 15b Through hole 1c, 15c Dimple 2 Armature 4 Iron core 4a Head 4c Small diameter part 4d Step surface 12,14 Bobbin 12a, 14a Cylindrical part 12d, 14b, 14c Counterbore

Claims (3)

[Claims] 1. A bobbin having a tubular portion around which a coil is wound and adjacent to a yoke, a large diameter portion inserted into the tubular portion of the bobbin at a central portion, and an open end of the tubular portion of the bobbin at one end. An iron core having a locked head portion, a small diameter portion inserted into a through hole of a yoke at the other end and caulked and fixed, and a step surface formed between the large diameter portion and the small diameter portion, and the through hole. And a yoke having a recess or a protrusion formed in the center, and a structure of an electromagnetic relay. 2. The structure of the electromagnetic relay according to claim 1, wherein the protrusion or the depression of the yoke is arranged so as to face the stepped surface of the iron core. 3. The structure of the electromagnetic relay according to claim 2, wherein a counterbore into which a protrusion of the yoke is loosely fitted is formed at an opening end of the cylindrical portion of the bobbin on the yoke side.