JP6665772B2 - Contact structure and electromagnetic relay - Google Patents

Description

  The present invention relates to a contact structure and an electromagnetic relay using the same.

  Patent Literature 1 discloses a contact piece structure of an electromagnetic relay. The contact piece structure includes a fixed contact piece having a fixed contact and a movable contact piece having a movable contact that is opposed to and can contact the fixed contact.

  In the contact piece structure, a movable contact is disposed at one end in the longitudinal direction of the rectangular plate-shaped movable contact piece, and a pair of cutout portions extending in the longitudinal direction from the longitudinal end of the movable contact piece close to the movable contact are provided. Have been. The pair of cut portions are provided symmetrically with respect to an imaginary straight line passing through the center of the movable contact and extending in the longitudinal direction of the movable contact piece.

JP-A-2000-149949

  In the contact piece structure, by providing a pair of cut portions, the elastic coefficient when the movable contact comes into contact with the fixed contact can be reduced, and even if the movable contact is reduced, a desired pressure between the fixed contact and the movable contact can be obtained. You can do it.

  However, in the contact piece structure, although a desired pressure between the fixed contact and the movable contact can be obtained by the pair of removing parts, the concentration of the stress generated on the movable contact piece is suppressed by providing the pair of removing parts. It was difficult.

  Accordingly, the present invention provides a contact structure and a contact structure capable of obtaining a desired pressure between a fixed contact and a movable contact while suppressing stress concentration occurring at and near the bottom edges of a pair of contact adjusting notches. An object of the present invention is to provide an electromagnetic relay including:

The contact structure of one embodiment of the present invention
A fixed contact piece having a fixed contact,
A movable contact that is opposed to and can contact the fixed contact is provided, and is provided in parallel with the fixed contact piece and electrically independent of the fixed contact side terminal, and is an elastically deformable plate-shaped. A movable contact piece,
With
The movable contact piece,
A pair of contact pressure adjusting notches arranged symmetrically with respect to a first virtual straight line on the plate surface passing through the center of the movable contact, on a plate surface facing the fixed contact;
The plate surface is arranged symmetrically with respect to the first imaginary straight line and connected to each of the bottom edges of the pair of contact pressure adjusting notches, and the area on the plate surface is a pair of the A pair of physical property adjustment cutouts provided so as to be smaller than each of the contact pressure adjustment notches,
Having.

An electromagnetic relay according to one embodiment of the present invention,
The contact structure is provided.

  According to the contact structure of the above aspect, the pair of contact pressure adjustment notches and the pair of physical property adjustment cutouts suppress the concentration of stress generated in the pair of contact pressure adjustment notches, The pressure between the movable contacts can be obtained.

  Further, according to the electromagnetic relay of the aspect, the contact structure makes it possible to obtain a desired pressure between the fixed contact and the movable contact while suppressing the concentration of stress generated in the pair of contact pressure adjusting notches.

The perspective view in the state where the cover of the electromagnetic relay provided with the contact structure of one embodiment of the present invention was removed. The perspective view of the electromagnetic relay of FIG. The top view of the movable contact side terminal of the electromagnetic relay of FIG. FIG. 4 is a plan view showing another example (first example) of the movable contact piece of the electromagnetic relay of FIG. 1. The top view which shows the other example (2nd example) of the movable contact piece of the electromagnetic relay of FIG. FIG. 9 is a plan view showing another example (third example) of the movable contact piece of the electromagnetic relay of FIG. 1. FIG. 9 is a plan view showing another example (fourth example) of the movable contact piece of the electromagnetic relay of FIG. 1. FIG. 9 is a plan view showing another example (fifth example) of the movable contact piece of the electromagnetic relay of FIG. 1. FIG. 13 is a plan view showing another example (sixth example) of the movable contact piece of the electromagnetic relay of FIG. 1. FIG. 13 is a plan view showing another example (seventh example) of the movable contact piece of the electromagnetic relay of FIG. 1.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, terms indicating a specific direction or position (for example, terms including “up”, “down”, “right”, and “left”) will be used as necessary. Is to facilitate understanding of the invention with reference to the drawings, and the technical scope of the invention is not limited by the meaning of those terms. Also, the following description is merely an example in nature, and is not intended to limit the present invention, its application, or its use. Further, the drawings are schematic, and the ratios of the dimensions do not always match actual ones.

  As shown in FIG. 1, the electromagnetic relay 1 according to one embodiment of the present invention includes a conductive fixed contact piece 10 having a fixed contact 11 and a conductive movable contact piece 20 having a movable contact 21. It has a contact structure.

  As shown in FIG. 2, the fixed contact piece 10 and the movable contact piece 20 are housed in an insulating housing 2 as an example. The housing 2 includes a rectangular plate-shaped base 30 (shown in FIG. 1) and a substantially rectangular box-shaped cover 40 (shown in FIG. 2) that covers the upper surface of the base 30.

  As shown in FIG. 1, the fixed contact piece 10 has a plate shape, is fixed to the first end 31 in the longitudinal direction of the upper surface of the base 30, and is arranged to extend along the short direction of the base 30. ing. The fixed contact 11 is fixed to the upper end of the fixed contact piece 10 and the second end 32 side of the plate surface. Further, a pair of fixed contact side terminals 12 projecting from the bottom surface of the base 30 are connected to the lower end of the fixed contact piece 10.

  As shown in FIG. 1, the movable contact piece 20 has a plate shape, is fixed to the second end 32 side of the upper surface of the base 30 with respect to the fixed contact piece 10 in the longitudinal direction, and is arranged in parallel with the fixed contact piece 10. Are located. The movable contact piece 20 is configured to be elastically deformable, and is electrically independent of the fixed contact piece 10. A movable contact 21 that is opposed to and can contact the fixed contact 11 is fixed to the upper end of the movable contact piece 20 and the first end 31 side of the plate surface. Further, a pair of movable contact side terminals 22 (only one is shown in FIG. 1) protruding from the bottom surface of the base 30 is connected to a lower portion of the movable contact piece 20.

  The base 30 is provided with an electromagnet 50 extending from the second end 32 of the base 30 to the vicinity of the movable contact piece 20. On the second end 32 side of the electromagnet section 50, a pair of coil terminals 51 (only one of which is shown in FIG. 1) protruding from the bottom surface of the base 30 are provided.

  An insulating cover 52 is provided at an end of the electromagnet section 50 on the first end 31 side of the base 30. A plate-like movable iron piece 53 is provided at an end of the electromagnet section 50 on the second end 32 side of the base 30. The movable iron piece 53 is disposed so as to extend in the short direction of the base 30, and the lower end thereof is rotatably fixed to the base 30. When a current is supplied to the electromagnet unit 50, the movable iron piece 53 rotates from the second end 32 side to the first end 31 side along the longitudinal direction of the base 30, and When the supply of current is stopped, the base 30 rotates from the first end 31 toward the second end 32 along the longitudinal direction of the base 30.

  A card 54 extending in the longitudinal direction of the base 30 is provided above the electromagnet section 50. In the card 54, the end of the base 30 on the first end 31 side is fixed to the upper end of the movable contact piece 20, and the end of the base 30 on the second end 32 side is fixed to the upper end of the movable iron piece 53. Have been.

  That is, when current is supplied to the electromagnet unit 50 in the electromagnetic relay 1 in the return state (the state in which the fixed contact 11 and the movable contact 21 are separated), the movable contact piece 20 becomes the base via the movable iron piece 53 and the card 54. 30 is pressed from the second end 32 side to the first end 31 side along the longitudinal direction of 30. As a result, the movable contact 21 comes into contact with the fixed contact 11, and the electromagnetic relay 1 changes from the reset state to the operating state (a state in which the fixed contact 11 and the movable contact 21 are in contact).

  When the supply of current to the electromagnet unit 50 is stopped, the pressing of the movable contact piece 20 via the movable iron piece 53 and the card 54 is released, and the movable contact piece 20 is moved in the longitudinal direction of the base 30 by its own elastic force. Move from the first end 31 side to the second end 32 side. Thereby, the movable contact 21 is separated from the fixed contact 11, and the electromagnetic relay 1 returns from the operating state to the returning state.

  Subsequently, the movable contact piece 20 will be described in more detail with reference to FIG.

  As shown in FIG. 3, the movable contact piece 20 has a long plate shape in which the vertical direction is longer than the horizontal direction, and the movable contact piece 20 The movable contact piece 20 has a shape that is symmetrical with respect to the first virtual straight line L1 on the plate surface of the movable contact piece 20 that passes through the center and extends in the longitudinal direction of the movable contact piece 20.

  At the lower end of the movable contact piece 20, four fixed portions 26 are provided. Via the fixed portion 26, the movable contact piece 20 and a terminal portion 25 provided with a pair of movable contact side terminals 22 are provided. Is connected. A substantially rectangular through hole 27 is provided in a portion of the movable contact piece 20 near the fixed portion 26 between the movable contact 21 and the fixed portion 26 when viewed from the plate surface.

  A pair of contact pressure adjusting notches 23 and a pair of physical property adjusting cutouts 24 are provided on both sides of the movable contact piece 20 of the movable contact 21 in the lateral direction. As described above, the pair of contact pressure adjusting notches 23 and the pair of physical property adjusting cutouts 24 are symmetrically arranged with respect to the first virtual straight line L1.

  Each of the notch portions 23 for adjusting contact pressure has a groove shape extending downward from the upper end of the movable contact piece 20 in the longitudinal direction of the movable contact piece 20, and is connected to the upper end of the movable contact piece 20 so as to be outside the movable contact piece 20. The first part 231 is connected to the first part 231, the second part 232 is continuous with the first part 231, and the third part 233 is continuous with the second part 232. The physical property adjusting cutout 24 is connected to the third portion 233 of each contact pressure adjusting notch 23.

  The first portion 231 has a certain width (length in the left-right direction in FIG. 3), and extends from the upper end of the movable contact piece 20 to substantially the center of the movable contact 21 along the first virtual straight line L1.

  The second part 232 extends from the lower end of the first part 231 to near the lower end edge of the movable contact 21. A side portion of the second portion 232 closer to the first virtual straight line L1 (hereinafter, referred to as a near side portion) is a lower portion in the longitudinal direction of the movable contact piece 20 from a lower end of the near side portion of the first portion 231. , It is inclined so as to approach the first virtual straight line L1. Further, a side portion of the second portion 232 farther from the first virtual straight line L1 (hereinafter, referred to as a far side portion) extends from a lower end of the far side portion of the first portion 231 in parallel to the first virtual straight line L1. ing.

  The third portion 233 extends from the lower end of the second portion 232 to substantially the center of the movable contact piece 20 in the longitudinal direction. The near side of the third portion 233 extends from the near side of the second portion 232 in parallel with the first virtual straight line L1. The far side of the third portion 233 is further away from the lower end of the far side of the second portion than the far sides of the first portion 231 and the second portion 232 from the first virtual straight line L1. , And then extend parallel to the first virtual straight line L1. The lower end of the near side portion and the lower end of the far side portion of the third portion 233 are connected by bottom edges 234 of the notch portions 23 for adjusting the contact pressure. 24 are connected.

  Each of the physical property adjusting cutouts 24 is disposed so as to be connected to each of the bottom edges 234 of the pair of contact pressure adjusting notches 23, and the area of the movable contact piece 20 on the plate surface is set to be equal to each contact pressure adjusting cutout 23. It is provided to be smaller than the notch 23.

  More specifically, each of the physical property adjustment cutouts 24 extends from the end near the first imaginary straight line L1 of the bottom edge 234, which is the notch bottom (bottom edge) of each contact pressure adjustment notch 23, to the length of the movable contact piece 20. It has a groove shape extending along the first virtual straight line L <b> 1 in the downward direction, and has a constant groove width smaller than the bottom edge 234 of each contact pressure adjusting notch 23. That is, each physical property adjusting cutout 24 has a smaller groove width than each contact pressure adjusting notch 23 at the boundary with each contact pressure adjusting notch 23.

  In addition, the groove width of each physical property adjusting cutout portion 24 is smaller than the length of each contact pressure adjusting cutout portion 23 on the second virtual straight line L2 passing through the point of force of the movable contact piece 20. In the movable contact piece 20, as shown in FIG. 1, a pair of driving portions 202, which are portions located on the outer side in the short direction of the movable contact piece 20 than the respective contact pressure adjusting notches 23, are pressed by the card 54. You. At this time, since the movable contact piece 20 has elasticity, the vicinity of the boundary between the second portion 232 and the third portion 233 of each contact pressure adjusting notch 23 becomes a power point, the fixed portion 26 becomes a fulcrum, and the movable contact 21 is the point of action.

  In the present embodiment, the thickness of the movable contact piece 20 is 0.15 mm. In this case, it is preferable that each physical property adjusting cutout 24 is provided so as to have a groove width of 0.1 mm or more. This is because the processing is difficult when the groove width of each physical property adjusting cutout 24 is less than 0.1 mm.

  Further, in the present embodiment, each of the physical property adjustment cutouts 24 is about 25% of the maximum groove width in the direction orthogonal to the first virtual straight line L1 of the third portion 233 of each contact pressure adjustment cutout 23. Although it is configured to have a groove width, it is preferable that the groove width of each of the physical property adjusting cutouts 24 is 95% or less of the maximum groove width of the third portion 233. This is because when the groove width of each of the physical property adjusting cutouts 24 exceeds 95% of the groove width of the third portion 233, the distance between the fixed contact 11 and the movable contact 21 adjusted by each contact pressure adjusting notch 23 is increased. This has a large effect on the pressure, and it is difficult to obtain a desired pressure between the fixed contact 11 and the movable contact 21.

  In the contact structure, a pair of physical property adjusting cutouts 24 are provided in addition to the pair of contact pressure adjusting notches 23. By providing the pair of contact pressure adjusting notches 23, the contact portion 201 which is a portion of the movable contact piece 20 sandwiched between the pair of contact pressure adjusting notches 23 when the movable contact 21 contacts the fixed contact 11. Can be reduced. Further, by providing the pair of physical property adjusting cutouts 24, it is possible to suppress the concentration of stress generated at each bottom edge 234 of the pair of contact pressure adjusting notches 23 and in the vicinity thereof. That is, the pair of physical property adjustment cutouts 24 suppresses the concentration of stress generated at each bottom edge 234 of the pair of contact adjustment notches 23 and the vicinity thereof, and the pair of contact pressure adjustment notches 23 reduces the stress concentration. A desired pressure between the fixed contact 11 and the movable contact 21 can be obtained.

  The movable contact piece 20 has a rectangular plate shape, and the first virtual straight line L1 extends in the longitudinal direction of the movable contact piece 20. Thereby, compared with the case where the first virtual straight line L1 extends in the short direction of the movable contact piece 20, the adjustment margin of the pair of contact pressure adjustment notches 23 and the pair of physical property adjustment cutouts 24 is increased. can do.

  Further, each contact pressure adjusting notch 23 has a groove shape extending in the longitudinal direction of the movable contact piece 20, and at the boundary between the contact pressure adjusting notch 23 and the property adjusting cutout 24, each physical contact adjusting notch 23 is formed. The cutout portion 24 has a groove width smaller than each contact pressure adjusting notch portion 23. Thereby, while the movable elastic contact 21 contacts the fixed contact 11, the spring elastic coefficient is reduced, and the concentration of stress generated at the bottom edge 234 of each contact pressure adjusting notch 23 and its vicinity can be suppressed. .

  In addition, the groove width of each physical property adjusting cutout portion 24 is smaller than the length of the contact pressure adjusting cutout portion 23 on the second virtual straight line L2 passing through the point of force of the movable contact piece 20. Accordingly, the bottom edge 234 of each contact pressure adjusting notch 23 is obtained without affecting the desired pressure between the fixed contact 11 and the movable contact 21 obtained by providing each contact pressure adjusting notch 23. And concentration of stress generated in the vicinity thereof can be suppressed.

  Further, in the electromagnetic relay 1, a desired pressure between the fixed contact 11 and the movable contact 21 can be obtained by the contact structure while suppressing the occurrence of stress concentration in the movable contact piece 20.

  The pressure between the fixed contact 11 and the movable contact 21 can be adjusted by adjusting the position, size, range, and the like of the pair of contact pressure adjusting notches 23.

  Further, by adjusting the position, size, range, and the like for forming the pair of physical property adjusting cutouts 24, the stress generated at each bottom edge 234 of the pair of contact pressure adjusting notches 23 and in the vicinity thereof. In addition to this, it is possible to adjust the spring elastic coefficient of the contact portion 201 when the movable contact 21 contacts the fixed contact 11, and to suppress an increase in the current density of the movable contact piece 20.

  In the electromagnetic relay 1, the pair of physical property adjusting cutouts 24 is formed so as to extend downward from the end of the bottom edge 234 of each contact pressure adjusting notch 23 near the first virtual straight line L <b> 1 in the longitudinal direction of the movable contact piece 20. Although it extends along the first virtual straight line L1, it is not limited to this. For example, as shown in FIG. 4, a pair of physical property adjustments are performed such that the distance from the bottom edge 234 of each contact pressure adjustment notch 23 toward the lower side in the longitudinal direction of the movable contact piece 20 is away from the first virtual straight line L1. Each of the resection portions 24 can be configured. Thereby, the distance on the plate surface between each of the property adjusting cutouts 24 and the through-hole 27 is increased as compared with the case where each of the property adjusting cutouts 24 extends along the first imaginary straight line L1, and is movable. The energization path of the contact piece 20 can be increased. As a result, an increase in the current density of the movable contact piece 20 can be suppressed.

  Further, as shown in FIG. 5, a pair of physical property adjusting portions are formed so as to extend from the bottom edge portion 234 of each contact pressure adjusting notch 23 toward the first virtual straight line L1 in a direction orthogonal to the first virtual straight line L1. Each of the cutouts 24 can be configured. Thereby, the spring elastic coefficient of the contact portion 201 when the movable contact 21 contacts the fixed contact 11 can be reduced.

  Further, as shown in FIG. 6, a pair of physical properties are set so as to approach the first imaginary straight line L1 from the bottom edge 234 of each contact pressure adjusting notch 23 toward the lower side in the longitudinal direction of the movable contact piece 20. Each of the adjusting cutouts 24 can be configured. Thereby, the conduction path between the movable contact 21 and the movable contact side terminal 22 can be secured while reducing the spring elastic coefficient when the movable contact 21 contacts the fixed contact 11. The through-hole 27 is not provided in the movable contact piece 20 shown in FIG.

  In the electromagnetic relay 1, the pair of physical property adjusting cutouts 24 has a constant groove width, but is not limited thereto. For example, as shown in FIG. 7, a pair of cuts for adjusting physical properties are formed such that the groove width decreases from the bottom edge 234 of each contact pressure adjusting notch 23 toward the lower side in the longitudinal direction of the movable contact piece 20. The unit 24 can be configured. Thereby, while suppressing the influence on the pressure between the desired fixed contact 11 and movable contact 21 obtained by each contact pressure adjusting notch 23, each bottom edge 234 of the pair of contact adjusting notches 23 and its It is possible to reduce the spring elastic coefficient when the movable contact 21 comes into contact with the fixed contact 11 while suppressing the concentration of stress generated in the vicinity.

  As shown in FIGS. 8 and 9, in addition to the pair of physical property adjusting cutouts 24, a pair of additional physical property adjusting cutouts 124 may be provided on the movable contact piece 20. The pair of additional physical property adjusting cutouts 124 are arranged symmetrically with respect to the first imaginary straight line L1 and discontinuously apart from each of the pair of contact pressure adjusting cutouts 23. Further, each of the pair of additional physical property adjusting cutouts 124 is provided such that the area of the movable contact piece 20 on the plate surface is smaller than each of the pair of contact pressure adjusting notches 23.

  In FIG. 8, each of the pair of additional physical property adjusting cutouts 124 extends from the bottom edge 234 of each contact pressure adjusting notch 23 toward the first virtual straight line L1 in a direction orthogonal to the first virtual straight line L1. It is configured as follows. In FIG. 9, the pair of additional physical property adjusting cutouts 124 is provided below the pair of contact pressure adjusting notches 23 and is provided independently of the pair of contact pressure adjusting notches 23. From the upper edge of the movable contact piece 20 along the first virtual straight line L1 toward the upper side in the longitudinal direction. In this manner, by providing the pair of additional physical property adjusting cutouts 124 in addition to the pair of physical property adjusting cutouts 24, the occurrence of stress concentration and the increase in current density in the movable contact piece 20 are more reliably suppressed. In addition, a desired pressure between the fixed contact 11 and the movable contact 21 can be obtained.

  The movable contact piece 20 may be configured such that the first virtual straight line L1 extends in the short direction of the movable contact piece 20, as shown in FIG.

  The pair of contact pressure adjusting notches 23 is not limited to the case where the notch 23 has a groove shape, but may have any shape capable of adjusting the contact pressure of the movable contact 21 to the fixed contact 11. Like the pair of contact pressure adjusting notches 23, the pair of physical property adjusting cutouts 24 is not limited to having a groove shape, but may have the physical properties of the movable contact piece 20 (for example, the movable contact 21 contacts the fixed contact 11). Any shape (for example, a notch) that can adjust the spring elastic coefficient of the movable contact piece 20 and the bottom edge of the pair of contact pressure adjusting notches and the stress generated in the vicinity thereof can be adopted. .

  The various embodiments of the present invention have been described above in detail with reference to the drawings. Finally, various aspects of the present invention will be described.

The contact structure according to the first aspect of the present invention includes:
A fixed contact piece having a fixed contact,
A movable contact that is opposed to and can contact the fixed contact is provided, is arranged in parallel with the fixed contact piece, is provided electrically independently of the fixed contact piece, and is an elastically deformable plate. And a movable contact piece of
With
The movable contact piece,
A pair of contact pressure adjusting notches arranged symmetrically with respect to a first virtual straight line on the plate surface passing through the center of the movable contact, on a plate surface facing the fixed contact;
The plate surface is arranged symmetrically with respect to the first imaginary straight line and connected to each of the bottom edges of the pair of contact pressure adjusting notches, and the area on the plate surface is a pair of the A pair of physical property adjustment cutouts provided so as to be smaller than each of the contact pressure adjustment notches,
Having.

  According to the contact structure of the first aspect, the pair of contact-adjustment notches is suppressed by the pair of physical-adjustment cutouts while suppressing the stress concentration occurring at and near the bottom edge of the pair of contact-adjustment notches. Thereby, a desired pressure between the fixed contact and the movable contact can be obtained.

In the contact structure according to the second aspect of the present invention,
The movable contact piece has a rectangular plate shape,
The first virtual straight line extends in a longitudinal direction of the movable contact piece.

  According to the contact structure of the second aspect, compared with the case where the first virtual straight line extends in the short direction of the movable contact piece, the adjustment of the pair of notch portions for adjusting the contact pressure and the pair of cutout portions for adjusting the property is performed. The margin can be increased.

In the contact structure according to the third aspect of the present invention,
The physical property adjustment excision part,
It has a groove shape that extends in the longitudinal direction of the movable contact piece and is inclined with respect to the first virtual straight line so as to approach the first virtual straight line as it moves away from the contact pressure adjusting notch.

  According to the contact structure of the third aspect, the elastic modulus of the spring when the movable contact comes into contact with the fixed contact is reduced, and the concentration of stress generated at the bottom edge of the pair of contact pressure adjusting notches and in the vicinity thereof is suppressed. In addition, a desired pressure between the fixed contact and the movable contact can be obtained.

In the contact structure according to the fourth aspect of the present invention,
The contact pressure adjusting notch has a groove shape extending in a longitudinal direction of the movable contact piece,
At the boundary between the contact pressure adjusting cutout and the property adjusting cutout, the property adjusting cutout has a smaller groove width than the contact pressure adjusting cutout.

  According to the contact structure of the fourth aspect, the bottom of each contact pressure adjustment notch is obtained without affecting the desired pressure between the fixed contact and the movable contact obtained by providing each contact pressure adjustment notch. Stress concentration occurring at the edge and its vicinity can be suppressed.

In the contact structure according to the fifth aspect of the present invention,
A groove width of the physical property adjusting cutout portion is smaller than a length of the contact pressure adjusting cutout portion on a second virtual straight line passing through a force point of the movable contact piece.

  According to the contact structure of the fifth aspect, the bottom edge of each contact pressure adjusting notch is obtained without affecting the desired pressure between the fixed contact and the movable contact obtained by providing the contact pressure adjusting notch. And concentration of stress generated in the vicinity thereof can be suppressed.

In the contact structure according to the sixth aspect of the present invention,
The plate surface is arranged symmetrically with respect to the first imaginary straight line and apart from each of the pair of contact pressure adjusting notches, and the area on the plate surface is a pair of the contact pressure adjusting notches. The apparatus further includes a pair of additional physical property adjustment cutouts provided to be smaller than each of the cutouts.

  According to the contact structure of the sixth aspect, it is possible to obtain a desired pressure between the fixed contact and the movable contact while more reliably suppressing the occurrence of stress concentration and the increase in current density in the movable contact piece.

In the electromagnetic relay according to the seventh aspect of the present invention,
The contact structure is provided.

  According to the electromagnetic relay of the seventh aspect, a desired pressure between the fixed contact and the movable contact can be obtained by the contact structure.

  In addition, by appropriately combining any of the above-described various embodiments or modifications, the effects of the respective embodiments or modifications can be achieved. Further, a combination of the embodiments or a combination of the examples or a combination of the embodiment and the example is possible, and a combination of the features in different embodiments or the examples is also possible.

  The present invention can be applied to, for example, an electromagnetic relay having an arbitrary configuration.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Housing 10 Fixed contact piece 11 Fixed contact 12 Fixed contact side terminal 20 Movable contact piece 201 Contact part 202 Drive part 21 Movable contact 22 Movable contact side terminal 23 Contact pressure adjusting notch 231 First part 232 Second Part 233 Third part 234 Bottom edge 24 Physical property adjusting cutout 25 Terminal 26 Fixing 27 Through hole 30 Base 31 First end 32 Second end 40 Cover 50 Electromagnet 51 Coil terminal 52 Insulation cover 53 Movable iron piece 54 Card 124 Additional physical property adjustment cutout L1 First virtual straight line L2 Second virtual straight line

Claims (7)

A fixed contact piece having a fixed contact,
A movable contact that is opposed to and can contact the fixed contact is provided, and is provided in parallel with the fixed contact piece and electrically independent of the fixed contact piece. A contact piece;
With
The movable contact piece,
A pair of contact pressure adjusting notches arranged symmetrically with respect to a first virtual straight line on the plate surface passing through the center of the movable contact, on a plate surface facing the fixed contact;
The plate surface is disposed symmetrically with respect to the first imaginary straight line and connected to each of the bottom edges of the pair of contact pressure adjusting notches, and the area on the plate surface is a pair of the notches. A pair of physical property adjustment cutouts provided so as to be smaller than each of the contact pressure adjustment notches,
Having a contact structure. The movable contact piece has a rectangular plate shape,
The contact structure according to claim 1, wherein the first virtual straight line extends in a longitudinal direction of the movable contact piece. The physical property adjustment excision part,
A groove extending in the longitudinal direction of the movable contact piece and being inclined with respect to the first virtual straight line so as to approach the first virtual straight line as it moves away from the contact pressure adjusting notch. Item 3. The contact structure according to Item 2. The contact pressure adjusting notch has a groove shape extending in a longitudinal direction of the movable contact piece,
4. The contact structure according to claim 3, wherein at the boundary between the contact pressure adjusting cutout and the physical property adjusting cutout, the physical property adjusting cutout has a smaller groove width than the contact pressure adjusting cutout. 5. .   4. The contact structure according to claim 3, wherein a groove width of the physical property adjusting cutout portion is smaller than a length of the contact pressure adjusting cutout portion on a second virtual straight line passing through a force point of the movable contact piece. 5.   The plate surface is arranged symmetrically with respect to the first imaginary straight line and apart from each of the pair of contact pressure adjusting notches, and the area on the plate surface is a pair of the contact pressure adjusting notches. The contact structure according to any one of claims 1 to 5, further comprising a pair of additional physical property adjusting cutouts respectively provided so as to be smaller than each.   An electromagnetic relay comprising the contact structure according to any one of claims 1 to 6.

Images