JPS61288336A - Electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field] The present invention relates to an electromagnetic relay.

[Background Art] Conventionally, an electromagnetic relay disclosed in US Pat. No. 4,323,945 has been known. In this electromagnetic relay, an actuator is formed in the armature, and when the armature swings between two predetermined positions in response to energization of the coil, the movable contact spring receives force from the actuator. v11#, which swings between the closed position and the open position with respect to the fixed contact. Also,
The movable contact spring applies a spring force to the actuator in a predetermined section of the swing range of the armature.

Here, the movable contact spring accumulates contact pressure against the fixed contact in the closed position, and in this state forms a so-called lift-off contact, α, which opens from the fixed contact in response to the pressing force from the actuator. The contact spring has a spring force to separate from the fixed contact in the open position, and forms a so-called 7-reflexia contact that is pressed to the closed position by the actuator as the armature swings.

In such a supplementary electromagnetic relay, when the armature swings from one of the two positions to the other, the movable contact spring and the actuator that are in contact with the movable contact spring are They slide relative to each other, and in the area where the movable contact spring and the actuator are relatively pressed within the swing range of the armature, frictional force due to the above sliding will occur. . The relative sliding movement between the movable contact spring and the actuator is based on the rotation center of the armature, that is, the rotation center of the actuator,
This is thought to be due to the fact that the effective center of rotation of the movable contact spring does not coincide with the center of rotation of the α spring, and furthermore, the center of rotation of the α spring shifts as the movable contact spring flexes after being moved.

This frictional force generates a moment around the center of rotation of the armature, and this moment is generated in a direction that opposes the torque generated around the center of rotation of the armature due to the magnetic force of the coil, so the electromagnetic relay can be used reliably. It requires a relatively large magnetic force to operate.

In addition, in a bistable electromagnetic relay, when a movable contact and a spring are arranged on both sides of the armature in the swing direction so that the armature receives the pressing force of the movable contact spring in both of the above two positions. In this case, when the armature is located at the center of the swing range, the forces of both rotating contact springs cancel each other out. In normal operation,
Due to the relatively large inertial mass of the armature, the armature does not stop at this position, but there is a moment acting on it that prevents the armature from swinging. If a pulse that is too short to reverse is input to the coil, there is a risk that the armature will remain stationary at the center of the swing range and not move. In such a situation, ■ above normal fill.

In this case, it is no longer possible to reverse the armature, and the electromagnetic relay loses its lf1 capability.

Furthermore, in the above-mentioned 7 lever contact point, a stop bar is provided to stop the movement of the armature, and when the armature reaches the position where the stopper stops the movement, the armature rebounds against the 7 bar. Since this repulsion is directly transmitted to the movable contact spring, a problem arises in that the contact flaps.

[Object of the Invention] The present invention has been made in view of the above-mentioned α, and its main purpose is to prevent the armature from swinging between the armature and the movable contact spring. By reducing the frictional force, in the case of a bistable type, it solves the problem of the armature stopping at an intermediate position in the swing range of the armature, and in the case of a 7-leverage contact, it eliminates the problem of the armature stopping due to the repulsive force acting on the armature. An object of the present invention is to provide an electromagnetic relay that avoids flapping of contacts.

DISCLOSURE OF THE INVENTION According to the solution to the problem described in the characterizing part of claim 1, an unloaded armature is provided which releases the armature from the spring force of the movable contact spring transmitted to the armature via the actuator. By providing the area within the swing range of the armature, the position of the actuator, with which the movable contact spring is in elastic contact, follows the movable contact spring, so that the relative movement between the actuator and the movable contact spring and from it The resulting frictional force is eliminated. In this case, friction occurs in the contact area between the actuator and the armature, which can be significantly reduced by appropriate bearing design.

Since the above-mentioned no-load region is effective in the direction of movement of the actuator, in the case of a bistable electromagnetic relay, the actuator is held by the spring force of a pair of movable contact springs that move toward the center position of the swing range of the armature. In addition, the armature becomes an area where the line of action of the magnetic force can exceed the center position of the swinging range of the armature, regardless of the actuator, that is, without being affected by the frictional force generated by the movable contact spring and the actuator. . This prevents the armature from stopping at an intermediate position in the swing range.

In the case of the 7-reflexia contact, due to the existence of the above-mentioned no-load region, the repulsive motion generated at one of the armature's stop positions is not necessarily transmitted to the actuator.
Therefore, the effect of preventing flapping of the contacts is brought about.

Conventionally, the stroke of the amateur was used as much as possible to operate the movable contact, but
The present invention utilizes a portion of the armature's swing range to provide the above-mentioned advantages, thereby taking the opposite approach.

Two alternative embodiments of the arrangement forming the no-load area are set out in claims 2 and 4, in which case claims 3 to 5 indicate that they are amateurs. This is advantageous insofar as it allows a support structure in which the rolling movement with the actuator reduces friction at the joint 3. Another aspect of the invention according to claim $6 is further advantageous in that it facilitates installation.

(Example 1) In this example, as shown in FIG. 1, a bistable electromagnetic relay is constructed. It has an H-shaped armature 11 that is swingably supported around a central rotating shaft 10.
1 is a pair of magnetic pole plates 12 spaced apart and arranged in parallel, and both magnetic poles! A permanent magnet 13 is interposed between the magnetic pole plates 12 and magnetizes both magnetic pole plates 12 to different polarities. The magnetic pole plate 12 and the permanent magnet 13 are integrated by a jacket 14 made of synthetic resin. A leg piece 15 of a yoke is inserted between each longitudinal end of both magnetic pole plates 12, and both leg pieces 1
A bridging piece (not shown) of the yoke that bridges the armature 5 is disposed below the armature 11 (on the back side of the paper in FIG. 1). That is, the yoke is formed in a U-shape, and a coil (not shown in FIG. 1) that excites both leg pieces 15 with different polarities is wound around the bridging piece. A pair of movable contact springs 17 are disposed along the longitudinal direction of the armature 11 on both sides of the armature 11 in the swinging direction corresponding to each end of the armature 11 in the longitudinal direction, sandwiching the armature 11 therebetween. . Each movable contact spring 17 is electrically and mechanically coupled to the terminal plate 18 at one end on the center side in the longitudinal direction of the armature 11, and at the other end after moving toward and away from the fixed contact 19. #, 20 are provided. 7 Machiyu 711 longitudinal direction l1IiijI! Each pair of movable contact springs 17 disposed corresponding to the armature 11 is driven by a common actuator 21 provided at the end of the armature 11 in the longitudinal direction.

As shown in Fig. f52, the actuator 21 is made of synthetic resin and has an E-shape that opens downward, and the connecting pin 22, which is the central piece, has a circular cross section.

This coupling pin 22 is an insertion hole 2 with a circular cross section formed in the outer cover 14 of the armature 11 in the vertical direction, that is, in the direction of gravity.
The inner diameter of the insertion hole 23 is set larger than the outer diameter of the coupling pin 22. The axis of the coupling pin 22 and the axis of the insertion hole 23 are parallel to the rotating shaft 10, and therefore perpendicular to the longitudinal direction of the armature 11 and perpendicular to the swinging force direction of the armature 11. The outer surfaces of the pressing pieces 24, which are both sides of the actuator 21, are curved around an axis parallel to the axis of the coupling pin 22.

(Operation) The operation will be explained below. The armature 11 swings between two positions in which its longitudinal end abuts the yoke depending on the direction in which the coil is energized. In the state shown in FIG. 1, the armature 11 is located in one of the above two positions, and the upper left movable contact spring 17 (similarly the lower right movable contact spring 17
) is located in the closed position, and the movable contact 20 is pressed against the fixed contact 19 by its own spring force. The actuator 21 is not in contact with the movable contact spring 17. On the other hand, the upper right movable Lg spring 17 (similarly the lower left movable contact spring 17) is connected to the corresponding actuator 21.
is pressed to the open position by the end of the contact and separated from the fixed contact 19. Amateur 11 as the coil is energized
When the actuator 2 rotates counterclockwise and moves to the other of the two positions, the upper actuator 2 in FIG.
1 is the upper right movable contact spring 1 that the right end is in contact with.
The actuator 21 is pushed leftward by the spring force 7, and the left end of the actuator 21 comes into contact with the upper left movable contact spring 17. This operating range is indicated by the symbol a in FIG. As the armature 11 moves further, the pressing force transmitted from the upper right movable contact spring 17 to the upper left movable contact spring 17 via the actuator 21 brings the σ spring 17 into contact with the fixed contact 19 after the upper left has moved. When the spring force is exceeded, the upper left movable contact spring 17 separates from the fixed contact 19. This operating range is indicated symbolically in FIG. Further, the actuator 21 presses the armature 11 to a position where the spring forces of the left and right movable contact springs 17 are balanced. This operating range is designated by the symbol C in FIG. In the operating range a-C, the coupling pin 22 of the actuator 21 is in contact with the left inner wall of the insertion hole 23 of the armature 11 shown in FIG. When the armature 11 moves further, the actuator 21 will stop until the coupling pin 22 comes into contact with the right inner wall of the insertion hole 23. That is, in this region, the armature 11 is released from the spring force transmitted from both rotary contact springs 17 via the actuator 21, and the armature 11 can swing freely regardless of the spring force of the movable contact spring 17. A no-load area (area d in FIG. 4) in which the load moves is provided. Thereafter, the actuator 21 moves to the left together with the armature 11, and at the end of the area indicated by symbol e in FIG. , the armature 11 reaches the other of the two positions.

As described above, in the no-load area d at the center within the swing range of the armature 11, the spring force of the movable contact spring 17 is transmitted to the armature 11 due to the play between the coupling pin 22 and the insertion hole 23. Therefore, the armature 11 moves only by magnetic force, and the moment due to the frictional force between the actuator 21 and the movable contact spring 17 due to the spring force of the movable contact spring 17 does not act on the armature 11. . Therefore, in this no-load region d, the magnetic force shown by the solid line in FIG. Movable contact bone 17 at
A relatively rapidly increasing force acts on the armature 11, unimpeded by the spring force of the armature, and draws the armature 11 to the other of the two positions. In this way, the armature 11 is prevented from stopping in the middle of the two positions.

As described above, when the armature 11 swings and performs a reversal operation from one position to the other, the actuator 21 does not swing together with the armature 11 around the rotating shaft 10, and the actuator 21 is in contact with each other. The movable contact springs 17 are slid in the left-right direction, and in this case, the relative movement between the movable contact springs 17 and the actuator 21 remains stopped. Therefore, the sliding friction that occurs at this contact position in conventional electromagnetic relays does not occur in the electromagnetic relay shown in this embodiment. Although friction occurs between the coupling pin 22 and the insertion hole 23, in this case, since the cross-sectional shapes of both are circular, it becomes rolling friction and is sufficiently small compared to sliding friction. Furthermore, the length of the arm that generates torque in the armature 11 due to this frictional force is at most equal to the radius of the coupling pin 22, as seen in conventional actuators that are fixedly coupled to the armature. This distance is very small compared to the distance from the rotation center of the armature 11 to the movable contact spring 17. This reduction in the moment caused by the frictional force is shown by the narrow distance between the two lines on both sides of the spring force indicated by the dashed line in FIG. From this point of view, the magnetic force does not decrease due to frictional force and the amateur 1
1 can be understood to have a very wide range of effects.

(Embodiment 2) In this embodiment, as shown in FIG. 3, a bistable electromagnetic relay is constructed. The armature 31 passes through the coil 30 and is supported so as to be swingable around a rotation point provided at the lower end of the armature 31 (on the back side of Figure 3). Third
The upper end of the armature 31 in the figure is
It is possible to reciprocate between the upper ends of a pair of magnetic pole plates 32 disposed on both sides of the magnetic pole plate 1, and between the two magnetic pole plates 32 there is a permanent magnet (not shown) that magnetizes the two magnetic pole plates 32 with different polarities. ) is interposed. Coil 30 and 1 amateur 31
A pair of movable contact springs 37a, 3 are provided on the left and right sides of the
7b is arranged, and a movable contact spring 37aw37
The lower end portions in FIG. 3 at b are electrically and mechanically connected to terminal plates 38, respectively. Movable contact spring 37a
, 37b at the upper free end thereof, a fixative solution,
A movable contact 40 that comes into contact with and separates from α39a and 39b is provided. Armature 31 for movable contact springs 37a, 37b
The movement of is transmitted through the actuator 41, and the movable contact springs 37a, 37b are inserted into an opening 44 formed in the actuator 41. Each pair of movable contact springs 37a and 37b has a spring force so as to come into elastic contact with the peripheral wall of the opening 44. Each movable contact spring 37a, 37b, together with the corresponding fixed contact 39a, 39b, forms a lift-off contact in the first region from the closed position to the open position, similar to the first embodiment, while reaching the closed position. 7 reflexion contacts are formed in the region where the contact pressure is applied by the actuator 41, and the contact pressure exerted by the actuator 41 in this case is strengthened by the other movable contact spring 39a, 39b.

A coupling hole 43 is formed in the actuator 41, and the coupling hole 43 has a larger dimension than the corresponding portion of the armature 31 in the swinging direction of the seven cutter 41. Therefore, as in the first embodiment, play is formed in the joint between the armature 31 and the actuator 41, and as a result, a no-load region similar to that in the first embodiment is formed in the center of the swing range of the armature 31. will be formed.

Both left and right sides 4 of the coupling hole 43 facing the armature 31
5 are each curved around an axis parallel to the opening surface of the coupling hole 43 and orthogonal to the swinging force direction of the armature 31. Therefore, the actuator 41 can not only slide with play in the swinging direction with respect to the armature 31, but also
It can swing around the armature 31. Therefore, even though the armature 31 rotates, the actuator 41 can move in its longitudinal direction (left and right direction), and the actuator 41 and the movable contact spring 37
Relative sliding between the ay37b and the ay37b is avoided. Also in this case, the actuator 41 and the armature 31
Only frictional force due to rolling friction is generated at the contact portion between the armature and the armature, and the length of the arm of the frictional torque is at most half the width of the coupling hole 43 of the armature 31.

Regarding the 7-lexia contacts 37b, 39b, as shown in FIG. 3, when the armature 31 reaches the left end position shown in FIG. 3 during swinging and collides with the upper end of the magnetic pole plate 32 at this position, The resulting repulsive movement is not necessarily transmitted to the left movable contact spring 37a, 37b due to the presence of play between the armature 31 and the actuator 41, and therefore the left movable contact spring 37b and its corresponding fixed contact, No flapping occurs at the contact point between α39b and α39b.

[Effects of the Invention] As described above, the present invention provides an armature that swings between two predetermined positions in response to energization of a coil, an actuator driven by the armature, and a swing range of the armature. It is equipped with a fixed contact that contacts the actuator in a predetermined section of the armature, and a movable contact spring that comes into contact with and leaves α as the armature swings, and from the spring force of the movable contact spring that is transmitted to the armature via the actuator. By providing an unloaded area within the swing range of the armature that releases the armature, relative sliding movements between the actuator and the movable contact spring and the resulting frictional forces are avoided. .

As a result, if the electromagnetic relay is designed as bistable, the existence of the no-load region causes a frictional force between the spring force of the movable contact spring and the actuator at the center position of the swing range of the armature. There is no occurrence of this, and only the operating force due to magnetic force acts on the amateur. As a result, the problem of amateurs remaining stuck midway is virtually eliminated.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing Embodiment 1 of the present invention, and FIG.
The figure is a partially exploded perspective view of the armature and actuator used in the above, FIG. 3 is a partially cutaway sectional view showing Embodiment 2 of the present invention, and FIG. 4 is an operation explanatory diagram showing the force acting on the armature. be. 11 is an armature, 17 is an α spring after movable, 19 is a fixed contact, 21 is an actuator, 22 is a coupling pin, 23 is an insertion hole, 30 is a coil, 31 is an armature, 37 is a movable contact spring, 39 is a fixed contact, 41 is an actuator, 4
3 is a coupling hole, and 45 is a side surface. Figure 1 Figure 2 Figure 3 Figure 4

Claims (6)

[Claims] (1) An armature that swings between two predetermined positions in response to energization of the coil, an actuator driven by the armature, and an armature that comes into contact with the actuator in a predetermined section of the armature's swing range. The armature is also equipped with a movable contact spring that moves into and out of contact with the fixed contact as the armature swings. An electromagnetic relay characterized in that it is provided within a range. (2) The actuator is provided with a coupling pin perpendicular to its swing direction, and the armature is provided with an insertion hole into which the coupling pin is inserted, and the insertion hole is larger in size than the coupling pin in the swing direction of the armature. 2. The electromagnetic relay according to claim 1, wherein the no-load area is formed by setting . (3) The electromagnetic relay according to claim 2, wherein the coupling pin and the insertion hole are formed to have a circular cross section, and the insertion hole is set to have a larger diameter than the coupling pin. (4) A coupling hole through which the armature is inserted is formed in the actuator, and the width of the coupling hole is set to be larger than the portion of the actuator that passes through the coupling hole in the swinging direction of the actuator, thereby forming the above-mentioned no-load area. An electromagnetic relay according to claim 1, characterized in that the electromagnetic relay comprises: (5) Claims characterized in that the coupling hole has both side surfaces in the swinging direction of the armature curved around an axis parallel to the opening surface of the coupling hole and orthogonal to the swinging direction of the armature. The electromagnetic relay according to item 4. (6) The armature is formed into an elongated shape and is swingable in a direction substantially perpendicular to the longitudinal direction of the armature, and the actuator is suspended from the armature with the gravity direction being perpendicular to the swinging direction and the longitudinal direction of the armature. Claims 1 to 5 characterized in that
The electromagnetic relay described in any of the paragraphs.