JPH11213839A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a card powder from falling to a movable contact for preventing the reduction in contact pressure between fixed and movable contacts by providing a card having an engaging protruding part to be engaged with each of both engaging recessed parts, which is interposed between a movable contact member and an armature. SOLUTION: When an upper part 131a of an armature 131 on the upper part of an iron core 133 is moved downwards by a magnetic force, a lower part 131b is moved toward the left, and a card 14 having a projection part 147 to be engaged with the slit 131c of the lower part 131b is also moved, while pressing the upper side of a movable spring block 12 toward the left. A movable contact 121 is thus connected electrically to a fixed contact 111. The lower part 131b of the armature 131 is moved clockwise, while the upper side of the movable spring block 12 moves counterclockwise. Since both side edge parts of an engaging recessed part 123 are formed into round surfaces by folded pieces 124, neither a force which folds an engaging protruding part 144 not wear is generated between the engaging recessed part 124 and the engaging protruding part 144 to be engaged therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay.

[0002]

2. Description of the Related Art FIG. 11 is a side view showing a part of a conventional electromagnetic relay. In FIG. 11, the electromagnetic relay 90 includes a fixed terminal block 91, a movable spring block 92, a driving unit 93, a card 94, a body 95 for accommodating them, and a cover (not shown).

The fixed terminal block 91 has a fixed contact 911 on the upper side and a connection terminal 912 on the lower side, while the movable spring block 92 has a movable contact 921 facing the fixed contact 911 on the upper side and a lower contact 912 on the lower side. A connection terminal 922 is provided on the side. The driving unit 93 includes a plate-shaped armature 9 bent in an L shape.
31 and the upper part 931a of the armature 931 using magnetic force
Of the armature 931 in a substantially vertical direction so that the lower part 931b of the armature 931 is driven.
Winding 932 and iron core 9 for moving the coil in substantially the left-right direction
33 and the like.

FIG. 12 is a perspective view of the movable spring block 92 and the card 94. The movable spring block 92 has a circular engagement hole 923 formed above the movable contact 921. The card 94 is formed in a disk shape, and a cylindrical insertion portion 941 to be inserted into the engagement hole 923 is formed on a surface on the engagement hole 923 side, and a contact surface is formed on the opposite surface. The angular projection 94 that engages with a not-shown slit of the pole 931
2 are formed.

FIG. 13 is a side view showing a part of the electromagnetic relay 90 in the off state, and FIG. 14 is a side view showing the electromagnetic relay 90 in the off state.
The ON / OFF operation of the electromagnetic relay 90 will be described with reference to these drawings. First, FIG.
3 is attracted to the upper part of the iron core 933 by the magnetic force of the coil winding 932 and the iron core 933,
When the upper portion 931a of the armature 931 is driven substantially downward, the lower portion 931b of the armature 931 moves substantially to the left, and has a projection 942 that engages with a not-shown slit of the lower portion 931b in accordance with this movement. The card 94 also moves while pushing the upper side of the movable spring block 92 substantially leftward.

As a result, the movable contact 921 becomes fixed contact 9
11 (FIG. 14), the connection terminals 912 and 9
22 is electrically connected. On the other hand, when the magnetic force is lost from the on state, for example, the upper side of the movable spring block 92 pushes back the card 94 substantially rightward so as to return to the original state by the elastic force of the movable spring block 92. Accordingly, the lower portion 931b of the armature 931 also moves substantially to the right.

As a result, the movable contact 921 is
11 (FIG. 13), the connection terminals 912 and 922 are electrically insulated. Further, Japanese Unexamined Patent Publication No.
Japanese Patent Publication No. 180786 discloses a fixed contact plate having a fixed contact, a movable contact spring having a movable contact, a card, and the like. An engagement recess is provided below the movable contact in the movable contact spring, and the engagement recess is provided. An electromagnetic relay in which a matching projection is provided on a card is disclosed.

[0008]

However, in the above-mentioned electromagnetic relay 90, the insertion portion 941 of the card 94 is shaved at the edge of the engaging hole 923 of the movable spring block 92, and the card powder generated by this shaving removes the movable contact 921. Descend to
In the ON state, there is a problem that a contact failure occurs between the fixed contact 911 and the movable contact 921.

To solve this problem, as shown in FIG. 15, a cylindrical countersink 924 is provided in the engagement hole 923 to prevent the insertion portion 941 from being worn at the edge of the engagement hole 923. There is something that I did. However, in FIG. 14, the lower portion 931b of the armature 931 moves clockwise around the bent portion of the armature 931 precisely, while the upper side of the movable spring block 92 rotates counterclockwise around the lower portion as a fulcrum. , A force is generated on the contact surface between the insertion portion 941 and the counter sink 924, and the insertion portion 9
There was a problem that 41 was easily broken.

Further, in the case of FIG.
When the hole diameter is increased because the contact point between the hole and the insertion portion 941 changes, the operation becomes unstable. Also in the case of FIG. 15, since the contact point between the counter sink 924 and the insertion portion 941 changes, a stable spring force is hardly obtained, and the operation becomes unstable. On the other hand, in the electromagnetic relay described in Japanese Patent Application Laid-Open No. 8-180786, the engaging recess is provided below the movable contact. The falling of the card powder to the movable contact caused by the shaving is prevented. In addition, since a process of providing a folded piece in the engagement concave portion is performed so as to prevent the engaging concave portion from shaving the protrusion that engages with the engagement concave portion, the generation of card powder is suppressed.

However, in the structure described in the above publication,
Since the card presses the center of the movable contact spring located below the movable contact, the movable contact spring itself is a plate-like elastic member extending in the vertical direction, so that the movable contact spring bends into a portion pressed by the card. This causes a problem that the contact pressure between the fixed contact and the movable contact is reduced by the amount of bending.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can prevent the card powder from falling toward a movable contact, and can prevent a card contact between a fixed contact and a movable contact caused by pressing a card against a movable contact member. An object of the present invention is to provide an electromagnetic relay capable of preventing a decrease in contact pressure of the electromagnetic relay.

[0013]

According to the present invention, there is provided a fixed contact member having a fixed contact and a first connection terminal at one end and the other end in one direction, respectively. In addition to having movable contacts facing each other so as to be able to contact and separate from each other, a second connection terminal is provided at the other end in the one direction, and a range from each of both sides of the movable contact to one end in the one direction A movable contact member having an engagement recess formed therein, and an armature provided so as to be able to approach and separate from the movable contact member, and a driving unit for bringing the armature close to and away from the movable contact member in accordance with an external signal And a card that is interposed between the movable contact member and the armature and has an engagement protrusion that engages with each of the engagement recesses.

In this configuration, the engaging portion between the movable contact member and the card, that is, the engaging portion between the two engaging concave portions and the two engaging convex portions extends from both sides of the movable contact to one end in one direction. For example, if one direction is set to the vertical direction and one end side is set to the upper side in the vertical direction, the engaging portion between the two engaging concave portions and the two engaging convex portions will be movable contacts. It will not be located vertically above. As a result, even if the card is worn at the engagement portion, the card powder due to the wear does not drop to the movable contact.

Further, since the portion of the movable contact member pushed by the card toward the fixed contact member is not located near the center of the movable contact member but in a range from both sides of the movable contact to one end, the movable contact member is A reduction in the contact pressure between the fixed contact and the movable contact caused by the pressing of the card is prevented. In addition, when the both side edges in the engagement concave portion are respectively R surfaces, a force is generated between the engagement concave portion and the engaging convex portion engaging with the engaging concave portion so as to break the engaging convex portion. In addition to this, it is more preferable that abrasion of the engaging convex portion by the engaging concave portion is prevented.

[0016] Further, there is provided a cover having a partition plate having a groove extending in the one direction formed therein, wherein the armature is provided with a slit extending in the one direction.
On the surface of the card on the armature side, a convex portion for controlling movement in the width direction of the groove inserted into the groove of the partition plate is formed, and at the tip of the convex portion, inserted into the slit. It may be one having a projected portion formed. According to this configuration, since the movement of the card in the width direction of the groove is regulated by the groove of the partition plate, a stable operation is ensured.

Further, the card may be such that the movement thereof is regulated by the groove of the partition plate, and the inside between the two engaging projections is separated from the movable contact member between the two engaging recesses. . In this configuration, since the inside of each of the engagement protrusions does not contact the movable contact member between the engagement recesses, the wear of the engagement protrusions by the engagement recesses is more appropriately prevented. Become.

[0018]

FIG. 1 is a perspective view showing a part of an electromagnetic relay according to an embodiment of the present invention, and FIG. 2 is a sectional view of the electromagnetic relay. The electromagnetic relay 10 has a fixed terminal block. It comprises a (fixed contact member) 11, a movable spring block (movable contact member) 12, a driving unit 13, a card 14, a body 15 and a cover 16 for accommodating them. Note that a partition plate 161 having a rectangular groove 161a extending in the vertical direction is integrally formed inside the cover 16.

The fixed terminal block 11 is a conductor, and has a cylindrical fixed contact 111 and a plate-shaped connection terminal (first connection terminal) 112 on the upper and lower sides, respectively. FIG.
4 is a perspective view of the movable spring block 12, FIG. 4 is a front view of the movable spring block 12 shown in FIG. 3, FIG. 5 (a) is a right side view thereof, and FIG. 5 (b) is a rear view thereof. The movable spring block 12 is an elastic member composed of a conductor,
In addition to having a columnar movable contact 121 opposed to the movable contact 11, a plate-like connection terminal (second connection terminal) 122 is provided on a lower side, and an engagement recess 123 is provided above both sides of the movable contact 121. Is formed. On both side edges (upper and lower edges extending in the left-right direction) of each of these engagement recesses 123, a process of providing a folded piece 124 is performed.
Face.

Further, the movable spring block 12 is
25 is inserted into the groove 151 of the body 15 (see FIG. 1), and the movable contact 121 is supported so as to be separated from the fixed contact 111 (see FIG. 2). Returning to FIG. 2, the driving unit 13 is a plate-shaped armature 13 bent in an L-shape.
And an upper portion 131a of the armature 131 is driven substantially vertically using magnetic force to move a lower portion 131b of the armature 131 substantially left and right,
3, a pair of coil terminals 134 and a yoke 135.

The structure of the driving section 13 will be described in more detail. As shown in FIG. 1, a vertically extending slit 131c is formed in the lower portion 131b of the armature 131 near the center. Further, the coil winding 132 is wound around the outer peripheral side wall surface of the tubular body 152 integrally formed with the body 15, and a pair of coil terminals 134 are connected to both ends of the coil winding 132. The iron core 133 is inserted into the cylindrical body 152, and the yoke 135 is inserted into the hole 1 of the body 15.
53 is inserted from below (FIG. 1).

FIG. 6 is a perspective view of the card 14, FIG. 7 (a) is an upper side view of the card 14 shown in FIG. 6, FIG. 7 (b) is a front view thereof, and FIG. 7 (c) is a right side view thereof. is there. Card 14
The substrate 141 and the projections 142 and 143 are integrally formed, and are interposed between the movable spring block 12 and the lower portion 131b of the armature 131 (see FIG. 2). Convex part 1
Reference numeral 42 stands upright on the surface of the substrate 141 on the movable spring block 12 side, and a front end of the projection 142 has a prismatic engagement with each of the engagement recesses 123 of the movable spring block 12. The projection 144 is formed. These engaging projections 14
A groove bottom 145 having an R-shaped edge is formed at a part of the center between the four groove bottoms 145.
46 are further formed.

The projection 143 is formed on the lower part 131 of the armature 131.
The slit 1 is formed on the surface of the substrate 141 on the side b, and the slit 1
A prismatic protrusion 147 that engages with 31c is further formed. The convex portion 143 is provided on the partition plate 1 of the cover 16.
The length in the left-right direction shown in FIG. 6 is set to be slightly shorter than the width in the left-right direction of the groove 161a so that it can be inserted into the groove 161a at 61.

FIG. 8 is a perspective view of the movable spring block 12 and the card 14, FIG. 9A is a cross-sectional view of the engagement when viewed from above, and FIG. It is sectional drawing when it sees from. As shown in FIG. 8, the dimension between the two engaging projections 144 of the card 14 is set to “A”,
The card 14 and the movable spring block 12 are formed so that the relationship of A> B is satisfied, assuming that the dimension of the movable spring block 12 between 23 is “B”. Meanwhile, card 1
4, the movement is regulated by inserting the convex portion 143 into the groove 161 a of the partition plate 161, and as shown in FIG. It is separated from the movable spring block 12 between the two engaging recesses 123. This prevents the movable spring block 12, that is, the engagement protrusion 144 from being scraped by the bottom of the engagement recess 123. As a result, generation of card powder (or conductor powder of the movable spring block 12) is suppressed.

In this embodiment, the two engaging projections 144 are used.
Does not push the movable spring block 12 toward the fixed terminal block 11, but as shown in FIG. 9B, a groove bottom formed between the engagement protrusions 144 and wider than the engagement protrusions 144. A structure 145 pushes the movable spring block 12 toward the fixed terminal block 11. As a result, the portion of the card 14 that presses the movable spring block 12 is hard to break. As a result, a high-strength engagement structure is obtained. Note that the length of the groove bottom 145 in the left-right direction is the same as the dimension “B”.
It is shorter than.

FIG. 10 is a partially cutaway perspective view showing the movable spring block 12, the card 14, and the cover 16. The support structure of the card 14 will be described with reference to FIG. The card 14 has both engaging projections 144 inserted into and engaging with both engaging recesses 123 of the movable spring block 12 supported by the body 15, and the movable spring block 12 side is supported.

On the other hand, in the card 14, the protrusion 143 is inserted into the groove 161 a of the partition plate 161 of the cover 16 to prevent a shift in the left-right direction (the width direction of the groove 161 a). Are inserted into and engaged with the slits 131c formed in the armature 131, and the armature 131 side is supported. At this time, FIG.
As shown in FIG. 7, the card 14 has a protrusion 147 whose downward movement is regulated at the bottom of the slit 131c, while an upward movement is regulated at the bottom of the groove 161a of the partition plate 161. Are moved more than necessary in the vertical direction so that the support by the engagement does not come off.

A return force of the movable spring block 12 to the armature 131 is applied to the supported card 14. Next, the operation of the present embodiment will be described. First, from the off state as shown in FIG.
When the upper portion 131a of the armature 131 is driven substantially downward by being attracted to the upper portion of the iron core 133 by the magnetic force of the iron core 133, the lower portion 131b of the armature 131 moves substantially to the left. Accordingly, the card 14 having the protrusion 147 engaging with the slit 131c of the lower portion 131b
Also moves while pushing the upper side of the movable spring block 12 substantially leftward. As a result, the movable contact 121 becomes the fixed contact 11
1 and the connection terminal 112 and the connection terminal 122 are electrically connected.

On the other hand, when the magnetic force is attenuated or lost below a predetermined level from the on state, the upper side of the movable spring block 12 is returned to the original state by the elastic force of the movable spring block 12 so as to return to the original state. 14 is pushed back substantially rightward, and accordingly, the lower portion 131b of the armature 131 also moves substantially rightward. Thereby, the movable contact 121 is separated from the fixed contact 111, and the connection terminal 112 and the connection terminal 122 are electrically insulated.

Next, each of the engagement recesses 123 in the above operation is described.
The function of the folded piece 124 will be described. The operation from the OFF state to the ON state will be described in detail. The lower portion 131b of the armature 131 moves clockwise around the bent portion of the armature 131 while the movable spring block 12 moves.
Although the upper side moves counterclockwise around the lower point,
Since both side edges of each of the engaging concave portions 123 are formed into an R surface by the folded pieces 124, the engaging convex portion is provided between each of the engaging concave portions 123 and the engaging convex portion 144 engaging with the concave portion. 1
44 is not generated, and the engagement recess 1
The abrasion of the engagement projection 144 due to both side edges of the projection 23 does not occur.

As described above, according to the present embodiment, the card powder can be prevented from falling toward the movable contact 121, and
The contact pressure between the fixed contact 111 and the movable contact 121 caused by the pressing of the card 14 against the movable spring block 12 can be prevented from lowering. In the present embodiment, the two engagement recesses 123 are provided above both sides of the movable contact 121, but the present invention is not limited to this, and a structure provided on both sides of the movable contact 121 may be used. Thereby, it is possible to most efficiently prevent a decrease in the contact pressure between the fixed contact 111 and the movable contact 121 caused by the pressing of the card 14 against the movable spring block 12. In short, it is only necessary that the engagement recess 123 is formed in a range from each of both sides of the movable contact 121 to the upper side.

In the present embodiment, each of the engagement recesses 123
The engaging projections 14 at both side edges of the engaging recess 123
A folded piece 124 is provided to prevent the abrasion of the card 4. However, even if card dust is generated due to the abrasion, since the movable contact 121 does not exist at the place where the card powder descends, a process for preventing the abrasion is performed. May be omitted. Needless to say, it is preferable to perform a wear prevention process.

Further, in this embodiment, each of the engagement recesses 12
The side edges of No. 3 have been subjected to the process of providing the folded pieces 124 to form an R surface. However, the present invention is not limited to this, and the side edges of each engagement recess 123 may be polished to the R surface. in short,
It suffices if both side edges in the engagement recess 123 are R-surfaces.

[0034]

As is apparent from the above description, according to the first aspect of the present invention, it is possible to prevent the card powder from falling toward the movable contact and to fix the card powder by pressing the card against the movable contact member. The contact pressure between the contact and the movable contact can be prevented from lowering. According to the second aspect of the present invention, it is possible to eliminate the generation of a force that breaks the engagement protrusion, and to prevent the engagement protrusion from being worn by the engagement recess.

According to the third aspect of the invention, a stable operation can be ensured. According to the fourth aspect of the present invention, it is possible to more suitably prevent the engagement convex portion from being worn by the engagement concave portion.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of an electromagnetic relay.

FIG. 3 is a perspective view of a movable spring block.

FIG. 4 is a front view of the movable spring block shown in FIG. 3;

5A is a right side view of the movable spring block shown in FIG. 3, and FIG. 5B is a rear view of the movable spring block.

FIG. 6 is a perspective view of a card.

7A is a top view of the card shown in FIG. 6, FIG.
FIG. 7B is a front view of the card, and FIG. 7C is a right side view of the card.

FIG. 8 is a perspective view of a movable spring block and a card.

FIG. 9A is a cross-sectional view when the engagement of the movable spring block and the card is viewed from above, and FIG. 9B is a cross-sectional view when viewed from the right side.

FIG. 10 is a partially cutaway perspective view showing a movable spring block, a card, and a cover.

FIG. 11 is a side view showing a part of an electromagnetic relay as a conventional example.

FIG. 12 is a perspective view of a movable spring block and a card.

FIG. 13 is a side view showing a part of the electromagnetic relay in an off state.

FIG. 14 is a side view showing a part of the electromagnetic relay in an off state.

FIG. 15 is a perspective view of a movable spring block and a card when a counter sink is provided in an engagement hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electromagnetic relay 11 Fixed terminal block 12 Movable spring block 13 Driving part 14 Card 15 Body 16 Cover 111 Fixed contact 112 Connection terminal 121 Movable contact 122 Connection terminal 123 Engaging recess 124 Folding piece 131 Armature 131c Slit 132 Coil winding 133 Iron Core 134 Coil terminal 141 Substrate 142, 143 Convex part 144 Engagement convex part 145 Groove bottom 146 Groove 147 Protrusion 161 Partition plate 161a Groove

Claims (4)

[Claims] 1. A fixed contact member having a fixed contact and a first connection terminal at one end and the other end in one direction, respectively; and a movable contact opposed to the fixed contact so as to be able to contact and separate from the fixed contact. In addition to having a second connection terminal at the other end in the one direction, a movable contact member in which an engagement recess is formed in a range from each of both sides of the movable contact to one end in the one direction, A drive unit that has an armature that is provided to be able to approach and separate from the movable contact member, and that causes the armature to approach and separate according to an external signal; and a drive unit that is interposed between the movable contact member and the armature. And a card having an engagement protrusion engaged with each of the engagement recesses. 2. Both side edges in the engagement recess are R
The electromagnetic relay according to claim 1, wherein the electromagnetic relay is a surface. A cover having a partition plate having a groove extending in the one direction formed therein, wherein the armature is provided with a slit extending in the one direction; On the surface of the card, there is formed a convex portion for restricting movement in the width direction of the groove inserted into the groove of the partition plate, and a protrusion inserted into the slit at a tip of the convex portion. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is formed. 4. The card is characterized in that the movement of the card is regulated by the groove of the partition plate, and the inside between the two engaging projections is separated from the movable contact member between the two engaging recesses. The electromagnetic relay according to claim 3, wherein