JPH0334175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field of the Invention> The present invention relates to a compact electromagnetic relay using a contact block.

<Prior Art> In recent years, with the miniaturization of electronic circuit elements, there has been a strong demand for miniaturization of electromagnetic relays. However, since electromagnetic relays have a complex structure and a large number of component parts, miniaturization increases the difficulty of assembling and manufacturing them.

For this reason, conventional miniaturized electromagnetic relays require multiple conductive members to be easily and uniformly assembled and manufactured simply by fitting or gluing, without requiring screw fixing or position adjustment work. A contact block in which a terminal of one end of a conductive member is protruded from the insulating member, and a contact is attached to the other end of the conductive member to form a contact mechanism. is used.

A small electromagnetic relay using such a contact block has been proposed in Japanese Utility Model Application No. 56-69841 and Japanese Patent Application Laid-open No. 56-69841.
Proposed in No. 69738.

In the small electromagnetic relay disclosed in Utility Model Application No. 56-69841, insulating members of two contact blocks are arranged on both sides in the width direction inside a case with an open bottom, and an electromagnet is arranged between these two insulating members, The mechanism is configured above the upper surface of the insulating member, and the terminal projects downwardly from the lower surface of the insulating member and extends downwardly from the end hole of the bottom cover.

On the other hand, in the small electromagnetic relay disclosed in JP-A No. 56-69738, the insulating member of the contact block has an L-shape with a horizontal part and a vertical part, and the horizontal part also serves as the bottom cover of the case. A contact mechanism is configured on the top surface, and terminals protrude directly outward from the bottom surface. A vertical portion is disposed at one end in the longitudinal direction of the case, and one end in the axial direction of the electromagnet is fixed to this vertical portion.

<Problems to be solved by the present invention> However, in the small electromagnetic relay of Utility Model Application No. 56-69841, the electromagnet is sandwiched between the insulating members of the contact block on both sides of the case, so the storage volume of the electromagnet 4 is small. Therefore, the electromagnet 4 has to be made smaller. For this reason, the electromagnet iron core cannot be made large, and the number of turns of the electromagnet coil cannot be increased, so the driving force of the electromagnet becomes small.Also, in order to increase the driving force, the electric power supplied to the electromagnet coil must be increased, resulting in consumption. There was a problem with the increase in power consumption.

In addition, since the length of the insulating member of the contact block in the vertical direction is large, when molding the conductive member, the thermal shrinkage rates of the insulating member 2 and the conductive member are greatly different, so the molded insulating member 2 and the conductive member It is easy to create minute voids between the mold part of the
For this reason, there was a problem in that if moisture from the outside were to infiltrate, it would infiltrate from the outside to the upper end of the inside of the electromagnetic relay due to capillary action.

Furthermore, in the small electromagnetic relay disclosed in JP-A No. 56-69738, the vertical part of the insulating member is placed at one end of the electromagnet in the axial direction, which similarly reduces the storage volume of the electromagnet and reduces the driving force of the electromagnet. There was a problem that increasing the driving force would require increased power consumption.

In addition, since the horizontal part of the insulating member also serves as the bottom cover of the case, external moisture can be absorbed by capillary action through the minute gaps created by the difference in thermal contraction rate between the insulating member and the conductive member. There was also the problem that the liquid could leak directly into the case.

The present invention solves these problems.

<Means for solving the above problems> In order to solve the above problems, in the small electromagnetic relay of the present invention, the width of the electromagnet 21 and the width of the yoke 22 are larger than the inner diameter of the case 43 in the width direction. Each insulating member 26 of the two contact blocks 24, 24 has a substantially rectangular shape, and its upper surface 26
In b, the yoke 22 of the electromagnetic block 20
The upper surface 26b has protrusions 40 on both sides of the yoke 22 in the width direction, each of which has a fitting portion for closely fitting into the lower surface 22a of the yoke 22, and the terminal protrudes downward from the lower surface 26a. , the contact mechanism 49 is provided on the side of the opposing surface 26c, and the fitting portions are fitted on both sides of the yoke 22 in the width direction, so that two contacts are provided on both lower sides of the electromagnetic block 20. Opposing surfaces 26 of the two insulating members 26, 26 when the blocks 24, 24 are integrally fixed
The distance between the outer surfaces 26d and 26d on the opposite side from the outer surfaces 26d and 26d is set approximately equal to the inner diameter of the case 43 in the width direction, and
The distance in the vertical direction between the lower surfaces 26a, 26a of the insulating members 26, 26 is set to be slightly smaller than the inner diameter in the height direction of the case 43, and the upper surfaces 26b, 26b of the insulating members 26, 26
is in close contact with the lower surface 22a of the yoke 22,
The fitting portions of the protruding portions 40, 40 of the insulating members 26, 26 are fitted on both sides of the yoke 22 in the width direction, so that the yoke 22 on the lower surface side of the electromagnetic block 20
The two contact blocks 24, 24 are integrally fixed to the lower surfaces of both sides in the width direction, and the integrated electromagnet block 20 and the two contact blocks 24, 24 are arranged in the case 43 so that the electromagnet 21 Located on the back side, a slight gap is formed between the upper end and both sides of the electromagnet 21 and the upper inner wall and both inner walls in the width direction of the case 43, and the lower surfaces 26a, 26 of the insulating members 26, 26
a coincides with the opening of the case 43, and the outer surfaces 26d, 26d of the insulating members 26, 26 are in close contact with the inner walls on both sides of the case 43 in the width direction, so that the insulating members 26, 26 are housed in a fitted and fixed state in the case 43. , the terminals projecting downward from the lower surfaces 26a, 26a of the insulating members 26, 26 project outward from the terminal holes of the bottom cover 44.

<Function> With this structure, the two contact blocks are integrally fixed on both sides of the lower surface of the electromagnet in the width direction of the yoke, and are fitted in the case to be positioned and fixed, so that the upper end of the electromagnet Since there is neither an insulating member nor a contact mechanism on both sides, the storage volume of the electromagnet becomes significantly large.Also, since the contact mechanism is configured inside the opposing surfaces of the two insulating members, the vertical direction of the insulating member is length becomes smaller.

<Embodiment of the present invention> An embodiment of the present invention will be described below based on the drawings.

1 to 6 show an embodiment of a small electromagnetic relay according to the present invention.

In these figures, 20 is an electromagnetic block, and a substantially L-shaped yoke 22 is attached so as to cover the lower surface and one end surface of the electromagnet 21. A pair of contact blocks 24,
Convex portions 23, 23 are formed for fitting into the fitting holes 25, 25 of 24, respectively.

As shown in FIG. 6, the width of the electromagnet 21 and the width of the yoke 22 are set to be slightly smaller than the inner diameter of the case 43 in the width direction.

The contact block 24 has a substantially rectangular insulating member 26 made of synthetic resin or the like, and has terminals 27 to 27 at one end.
The conductive member 30 is molded. As shown in FIG. 2, these conductive members have a connecting piece 31, a pedestal piece 32, and fixed contact plate pieces 33, 34 extending to the other end sides of the terminals 27, 28, 29, 30, respectively. There is.

As shown in FIGS. 2 and 3, the insulating member 26 has cutouts 35 and 3 in the lower surface 26a from which the terminals protrude.
6, 37 on the upper surface 2 opposite to this lower surface 26a.
It has a notch 38 at 6b. These notches 35 to 38 are formed to appropriate depths, and the lower surface 2
6a, and a bottom surface substantially parallel to the top surface 26b.

The connection piece 31, the pedestal piece 32, and the fixed contact plate pieces 33 and 34 have cutouts 35, 36, and 3, respectively.
At 7, 38, it projects outwardly, perpendicular to the bottom surface. That is, the connecting piece 31,
The base piece 32 and the fixed contact plate piece 33 protrude toward the lower surface 26a, and the other fixed contact plate piece 34 protrudes from the upper surface 26a.
It protrudes to the b side.

Connection piece 31, pedestal piece 32, fixed contact plate piece 3
3 and 34 are bent at right angles along the bottom surfaces of the respective notches 35, 36, 37, and 38. Therefore, the two fixed contact plate pieces 33 and 34 are arranged so as to sandwich the insulating member 26 from both upper and lower surfaces.
6b and face each other on the side of the opposing surface 26c adjacent to the opposite surface 26c.

One end of a movable contact spring 39 is fixed to the upper surface of the base piece 32, as shown in FIG. Therefore, the other end of the movable contact spring 39 is located between the two fixed contact plate pieces 33 and 34, but due to its spring properties, it is always in contact with the upper fixed contact plate piece 33. There is.

Contact members 33a and 34a must be fixed to the mutually opposing surfaces of the fixed contact plate pieces 33 and 34, respectively. For this purpose, as shown in FIG. 4, since the fixed contact plate pieces 33 and 34 protrude upward and downward, respectively, the contact members 33a and 34a are fixed on the same side and then bent so as to face each other. good. Contact members 39a and 39b are fixed to the upper and lower surfaces of the movable contact spring 39 at positions corresponding to the contact members 33a and 34a, respectively.

The fitting hole 25 of the insulating member 26 is formed on the upper surface 26.
At the base of the protrusion 40 protruding from approximately the center of b,
It is formed. In order to strongly hold the protrusion 23 of the fitted yoke 22, the upper edge 25a of the fitting hole (fitting part) 25 is bulged downward in an arc shape, and the upper edge 25a is Due to its elasticity, the convex portion 23 of the yoke 22 and the upper surface 26b of the insulating member 26 are connected to the yoke 2.
2, tightly fitted and held in close contact with the lower surface 22a of 2.

Then, in the state where the two contact blocks 24, 24 are integrally fixed to the lower sides of both sides of the electromagnetic block 20, the two insulating members 26, 2
6 facing surfaces 26c, 26c and the opposite outer surface 26
The distance between d and 26d is set approximately equal to the inner diameter of the case 43 in the width direction, as shown in FIG.
In addition, the vertical distance between the upper end of the electromagnet 21 and the lower surfaces 26a, 26a of the insulating members 26, 26 is the sixth
As shown in the figure, it is set to be slightly smaller than the inner diameter of the case 43 in the height direction.

A nearly L-shaped armature 4 is attached to the lower corner of the yoke 22.
1. On the bottom side, there is a hinge spring 42 that is almost L-shaped.
In this state, insert the insulating members 26, 26 into the holes 25, 25 from both sides of the yoke 22.
Press to fit the protrusions 23, 23. Therefore, as shown in FIG.
a is located above the movable contact spring 39. When the coil of the electromagnet is energized and attracted to the iron core 21a, the armature 41 presses the movable contact spring 39 downward. As a result, the contact member 39b of the movable contact spring 39 is connected to the contact member 39b of the lower fixed contact plate piece 34.
Contact 4a. In this way, the contacts are switched.

In this way, a pair of contact blocks 24, 24 are fitted and integrated on both sides of the lower part of the electromagnetic block 20, and housed in an integrally molded case 43 having a hollow rectangular shape with an open bottom. That is, as shown in FIG. 6, inside the case 43, the electromagnet 2
1 is located on the back side, a slight gap is formed between the upper end and both sides of the electromagnet 21 and the upper inner wall of the case 43 and the inner walls on both sides in the width direction, and the lower surfaces 26a, 26a of the insulating members 26, 26 is case 4
3, and further insulating members 26, 26
The outer surfaces 26d, 26d of the case 43 are housed in the case 43 in a fitted and fixed state by coming into close contact with the inner walls on both sides in the width direction of the case 43.

The rectangular flat bottom cover 44 has terminal holes 45 to 48 through which the terminals 27 to 30 pass. Therefore,
If the terminals 27 to 30 are pushed through the lower side of the case 43 to the terminal protruding surface 26a of the insulating member 26, the opening of the case 43 is closed. Apply adhesive to the periphery of the bottom cover 44 to attach the bottom cover 44 to the case 4.
Fixed at 3. Further, the adhesive is applied to the terminal holes 45 to 48 as well.

In this way, as shown in FIG.
6 and 26 are located on the opposite side of the electromagnet 21 with respect to the yoke 22, and are connected to the contact mechanism 49 and the terminals 27 to 30.
are all located on the opposite side of the yoke 22 from the electromagnet 21.

<Effects of the present invention> Since the compact electromagnetic relay of the present invention has such a structure, it has the following effects.

(a) Since the contact mechanism 49 is configured on the side of the opposing surface 26c of the insulating member 26 that is perpendicular to the protruding surface 26a of the terminal 1, the electromagnetic block 20 is connected to the two insulating members of the two contact blocks 24, 24. 2
The electromagnetic block 20 is housed in the inner part of the case 43, and a pair of contact blocks 24, 24 are housed between the electromagnetic block 20 and the bottom cover 244. Therefore, since there are no other members between the upper end and both sides of the electromagnet and the inner wall of the case, a significantly large electromagnet storage volume can be secured, and therefore a significantly large volume can be secured in proportion to the overall volume of the electromagnetic relay. electromagnets can be used. Therefore, a large electromagnetic driving force can be secured with small power consumption.

(b) Since the lower surfaces 26a of the insulating members 26, 26 are not exposed to the outside and are covered with the bottom cover 44, the infiltration of moisture due to capillary action into the gap in the terminal mold portion is significantly reduced.

(C) The height of the insulating member 26 may be between the bottom cover 44 and the electromagnet 21, so the height of the insulating member 26 is between the conductive member and the electromagnet 21.
The occurrence of voids in the terminal mold section due to the difference in thermal shrinkage rate between the terminal mold and the terminal mold is significantly reduced. For this reason, the bottom cover 4
Even if external moisture intrudes from the case 43, the infiltration upward due to capillary action is significantly reduced, and it will not infiltrate deep into the case 43.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an electromagnetic relay according to an embodiment of the present invention, FIG. 2 is a side view showing a contact block before processing in the electromagnetic relay of FIG. 1, FIG. 3 is a perspective view thereof, and FIG. The figure is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a side view of the contact block showing the relationship between the armature and the movable contact spring, and FIG. 6 is a sectional view of the same electromagnetic relay. 20... Electromagnet block, 21... Electromagnet, 2
2... Yoke, 23... Convex portion, 24... Contact block, 25... Fitting hole, 26... Insulating member, 26
a...Bottom surface, 26b...Top surface, 26c...Opposing surface, 26d...Outer surface, 27-30...Terminal, 40
... Protrusion, 41 ... Armature, 42 ... Hinge spring, 43 ... Case, 45-48 ... Terminal hole, 4
9...Contact mechanism.

Claims (1)

[Scope of Claims] 1. An integrally molded hollow rectangular box-shaped case 43 with an open bottom surface, a flat bottom cover 44 having a plurality of terminal holes and closing the opening, and an electromagnet 21. An electromagnetic block 20 is provided with a yoke 22 on the lower surface side and is housed in the case 43. Both ends of a conductive member insert-molded in an insulating member protrude outward from the insulating member, and a contact mechanism 49 is configured at one end. and a terminal is configured on the other end,
A small electromagnetic relay comprising two contact blocks 24, 24 respectively housed on both sides inside the case 43 with the terminals protruding outward from the terminal holes of the bottom cover 44, wherein the electromagnet 21 is The width and the width of the yoke 22 are set to be slightly smaller than the inner diameter in the width direction of the case 43, and each insulating member 26 of the two contact blocks 24, 24 has a substantially rectangular shape, Its upper surface 26
In b, the yoke 22 of the electromagnetic block 20
The upper surface 26b has protrusions 40 on both sides of the yoke 22 in the width direction, each of which has a fitting portion for closely fitting into the lower surface 22a of the yoke 22, and the terminal protrudes downward from the lower surface 26a. , the contact mechanism 49 is provided on the side of the opposing surface 26c, and the fitting portions are fitted on both sides of the yoke 22 in the width direction, so that two contacts are provided on both lower sides of the electromagnetic block 20. Opposing surfaces 26 of the two insulating members 26, 26 when the blocks 24, 24 are integrally fixed
The distance between the outer surfaces 26d and 26d on the opposite side from the outer surfaces 26d and 26d is set approximately equal to the inner diameter of the case 43 in the width direction, and
The distance in the vertical direction between the lower surfaces 26a, 26a of the insulating members 26, 26 is set to be slightly smaller than the inner diameter in the height direction of the case 43, and the upper surfaces 26b, 26b of the insulating members 26, 26
is in close contact with the lower surface 22a of the yoke 22,
The fitting portions of the protruding portions 40, 40 of the insulating members 26, 26 are fitted on both sides of the yoke 22 in the width direction, so that the yoke 22 on the lower surface side of the electromagnetic block 20
The two contact blocks 24, 24 are integrally fixed to the lower surfaces of both sides in the width direction, and the integrated electromagnet block 20 and the two contact blocks 24, 24 are arranged in the case 43 so that the electromagnet 21 Located on the back side, a slight gap is formed between the upper end and both sides of the electromagnet 21 and the upper inner wall and both inner walls in the width direction of the case 43, and the lower surfaces 26a, 26 of the insulating members 26, 26
a coincides with the opening of the case 43, and the outer surfaces 26d, 26d of the insulating members 26, 26 are in close contact with the inner walls on both sides of the case 43 in the width direction, so that the insulating members 26, 26 are housed in a fitted and fixed state in the case 43. , a small electromagnetic relay characterized in that the terminals protruding downward from the lower surfaces 26a, 26a of the insulating members 26, 26 protrude outward from the terminal holes of the bottom cover 44.