Electromagnetic relay

Abstract

The electromagnetic relay includes a fixed terminal, a movable contact piece, a first contact, and a second contact. The fixed terminal includes a first surface. The movable contact piece includes a second surface arranged opposite to the first surface. The first contact is embedded in either the fixed terminal or the movable contact piece in a manner coplanar with either the first surface or the second surface. The second contact is arranged opposite to the first contact on either the fixed terminal or the movable contact piece. The second contact includes a contact surface that protrudes from either the first surface or the second surface toward the first contact and is smaller than the first contact when viewed from a direction opposite to the first contact.

Description

Technical Field

[0001] The invention relates to an electromagnetic relay. Background Art

[0002] In the past, electromagnetic relays for opening and closing circuits were known. For example, the electromagnetic relay of Patent Document 1 includes a fixed terminal, a fixed contact disposed on the fixed terminal, a movable contact piece, and a movable contact disposed on the movable contact piece. The movable contact can contact the fixed contact, and the circuit is opened and closed by the movable contact contacting the fixed contact or separating from the fixed contact. In addition, a permanent magnet is provided in the electromagnetic relay, and the permanent magnet is used to extend the arc generated when the movable contact separates from the fixed contact (see Patent Document 1).

[0003] Patent Document 1: Japanese Patent No. 6281301 Summary of the invention

[0004] In the electromagnetic relay of Patent Document 1, the fixed contact protrudes from the fixed terminal toward the movable contact. In addition, the movable contact protrudes from the movable contact piece toward the fixed contact. Therefore, a step difference is generated between the fixed contact and the fixed terminal, and between the movable contact and the movable contact piece.

[0005] If there is a step difference between the fixed contact and the fixed terminal, and between the movable contact and the movable contact piece, the arc will stick to the step when the arc is generated, hindering the extension of the arc. Therefore, in order to extend the arc, a stronger magnet is required. In addition, if the arc sticks, the arc cut-off time becomes longer, so the loss of the contact becomes greater, and the life of the electromagnetic relay may be reduced.

[0006] An object of the present invention is to suppress arc sticking when a movable contact is separated from a fixed contact.

[0007] (1) An electromagnetic relay according to one embodiment of the present invention comprises a fixed terminal, a movable contact piece, a first contact, a second contact, a drive shaft, and an electromagnetic drive device. The fixed terminal includes a first surface. The movable contact piece includes a second surface arranged opposite to the first surface. The first contact is embedded in either the fixed terminal or the movable contact piece in a coplanar manner with either the first surface or the second surface. The second contact is arranged opposite to the first contact on either the fixed terminal or the movable contact piece. The second contact includes a contact surface that protrudes from either the first surface or the second surface toward the first contact and is smaller than the first contact when viewed from a direction opposite to the first contact. The drive shaft is connected to the movable contact piece so as to be movable as a whole. The electromagnetic drive device moves the drive shaft in a contact direction in which the first contact contacts the second contact and in a separation direction in which the first contact separates from the second contact.

[0008] In the electromagnetic relay, the first contact is embedded in either the fixed terminal or the movable contact piece in a manner coplanar with either the first surface or the second surface. For example, when the first contact is embedded in the fixed terminal in a manner coplanar with the second surface of the fixed terminal, no step difference is generated between the first contact and the fixed terminal, so when an arc is generated, it is possible to suppress the arc from sticking between the first contact and the fixed terminal. In addition, the second contact can contact the first contact with a contact surface smaller than that of the first contact, so that even if the position of the movable contact piece is offset when the movable contact piece moves, the first contact and the second contact can be reliably contacted. Thus, for example, when the first contact is arranged on the fixed terminal and the second contact is arranged on the movable contact piece, it is possible to prevent the second contact from contacting the fixed terminal.

[0009] (2) Preferably, the first surface of the fixed terminal has a flat shape along a direction orthogonal to the drive shaft, the first contact is embedded in the fixed terminal in a manner coplanar with the first surface, and the second contact protrudes from the second surface of the movable contact piece toward the first contact. In this case, arc sticking between the first contact and the fixed terminal can be suppressed. In addition, since the first surface is a flat shape along a direction orthogonal to the drive shaft, the first contact and the second contact can be stably contacted.

[0010] (3) Preferably, the fixed terminal includes a recessed portion recessed from the first surface in the contact direction, and the first contact is arranged in the recessed portion of the fixed terminal. In this case, positioning of the fixed contact is facilitated when the fixed contact is welded to the fixed terminal.

[0011] (4) Preferably, the second surface of the movable contact piece has a flat shape along a direction orthogonal to the drive shaft, the first contact is embedded in the movable contact piece in a manner coplanar with the second surface, and the second contact protrudes from the first surface of the fixed terminal toward the second contact. In this case, it is possible to suppress the arc from sticking between the first contact and the movable contact piece. In addition, since the first surface is a flat shape along a direction orthogonal to the drive shaft, the first contact and the second contact can be stably contacted.

[0012] (5) Preferably, the movable contact piece includes a recessed portion recessed from the second surface in the separating direction, and the second contact is arranged in the recessed portion of the movable contact piece. In this case, positioning of the movable contact is facilitated when welding the movable contact to the movable contact piece.

[0013] (6) Another aspect of the electromagnetic relay of the present invention comprises a first fixed terminal, a second fixed terminal, a movable contact piece, a first fixed contact, a second fixed contact, a first movable contact, a second movable contact, a drive shaft, and an electromagnetic drive device. The first fixed terminal includes a first surface. The second fixed terminal includes a second surface, which is arranged at a distance from the first fixed terminal. The movable contact piece includes a third surface arranged opposite to the first surface and the second surface. The first fixed contact is a cathode contact, and is embedded in the first fixed terminal in a manner coplanar with the first surface. The second fixed contact protrudes from the second surface of the second fixed terminal toward the third surface. The first movable contact is arranged opposite to the first fixed contact, can contact with the first fixed contact, and protrudes from the third surface toward the first surface. The second movable contact is arranged opposite to the second fixed contact, can contact with the second fixed contact, and is embedded in the movable contact piece in a manner coplanar with the third surface. The drive shaft is connected to the movable contact piece so as to be movable as a whole. The electromagnetic drive device moves the drive shaft in a direction in which the first fixed contact contacts the first movable contact and the second fixed contact contacts the second movable contact, and in a direction in which the first fixed contact separates from the first movable contact and the second fixed contact separates from the second movable contact. The first movable contact includes a first contact surface that is smaller than the first fixed contact when viewed from a direction opposite to the first fixed contact. The second fixed contact includes a second contact surface that is smaller than the second movable contact when viewed from a direction opposite to the second movable contact. The first fixed contact and the second movable contact are cathode contacts.

[0014] In this electromagnetic relay, for example, when the electromagnetic relay has polarity, arc sticking can be effectively suppressed by eliminating the step difference at the contact point on the cathode side where the arc is difficult to extend.

[0015] According to the present invention, it is possible to suppress the arc from sticking when the movable contact is separated from the fixed contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of an electromagnetic relay according to one embodiment of the present invention.

[0017] Figure 2 This is an enlarged cross-sectional view of the movable contact piece and its surroundings.

[0018] Figure 3 This is a diagram showing the first fixed contact and its surroundings as viewed from the separating direction side.

[0019] Figure 4 This is a cross-sectional view of an electromagnetic relay when voltage is applied to the coil.

[0020] Figure 5 It is an enlarged cross-sectional view of the periphery of the movable contact piece according to the first modified example.

[0021] Figure 6It is an enlarged cross-sectional view of the surrounding area of ​​the movable contact piece according to the second modification.

[0022] Figure 7 It is an enlarged schematic diagram of the surrounding area of ​​the movable contact piece of the third modified example.

[0023] Figure 8 It is an enlarged schematic diagram of the surrounding area of ​​the movable contact piece of the fourth modified example.

[0024] Explanation of symbols: 4…driving shaft; 5…electromagnetic driving device; 14…first fixed terminal; 14a…first surface; 14b…recess; 15…second fixed terminal; 15a…first surface; 15b…recess; 16…first fixed contact; 17…second fixed contact; 20…movable contact piece; 20a…second surface; 20b…recess; 26…first movable contact; 27…second movable contact; 100…electromagnetic relay; A1…contact surface; A2…contact surface; Z1…contact direction; Z2…separation direction. DETAILED DESCRIPTION

[0025] Hereinafter, an embodiment of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. Figure 1 is a cross-sectional view of the electromagnetic relay 100. Figure 1 As shown in FIG. 1 , the electromagnetic relay 100 includes a housing 2, a contact device 3, a drive shaft 4, and an electromagnetic drive device 5. In the following description, the direction in which the axis Ax of the drive shaft 4 extends is referred to as the "axial direction". In addition, in order to make the description easier to understand when referring to the drawings, Figure 1 The upper side in the description is set as "upper", the lower side is set as "lower", the left side is set as "left", and the right side is set as "right". In addition, in this embodiment, Figure 1 The lower part of the diagram is the contact direction Z1. Figure 1 The upward direction in the figure is the separation direction Z2. The details of the contact direction Z1 and the separation direction Z2 will be described later.

[0026] The housing 2 includes a housing 2a and a cover 2b. The housing 2a is a roughly quadrilateral box-shaped body with an open top. The cover 2b covers the top of the housing 2a. The housing 2 is sealed inside by the housing 2a and the cover 2b. The housing 2a and the cover 2b are formed of insulating materials. The contact device 3, the drive shaft 4, and the electromagnetic drive device 5 are accommodated inside the housing 2.

[0027] A contact housing 11 accommodating the contact device 3 and a contact cover 12 covering the upper side of the contact housing 11 are arranged in the housing 2. The contact housing 11 and the contact cover 12 are formed of a material having insulating properties.

[0028] The contact housing 11 includes a bottom 11a, a cylindrical portion 11b, a first contact support portion 11c, and a second contact support portion 11d. The bottom 11a is formed in a rectangular plate shape. The length direction of the bottom 11a is Figure 1 The left and right directions in are consistent.

[0029] The cylindrical portion 11b extends in a cylindrical shape in the axial direction. The cylindrical portion 11b protrudes downward from the center of the bottom 11a, and protrudes upward from the center of the bottom 11a. The cylindrical portion 11b includes a through hole 18 that penetrates the bottom 11a in the axial direction. The through hole 18 penetrates the center of the bottom 11a in the axial direction. The through hole 18 allows the drive shaft 4 to penetrate in the axial direction.

[0030] The first contact support portion 11c is arranged on the left side of the center of the bottom 11a in the longitudinal direction. The first contact support portion 11c is formed to protrude upward from the bottom 11a in a rectangular shape. The second contact support portion 11d is arranged on the right side of the center of the bottom 11a in the longitudinal direction. The second contact support portion 11d is formed to protrude upward from the bottom 11a in a rectangular shape.

[0031] The contact cover 12 covers the upper portion of the contact housing 11. The contact cover 12 includes an arc extension wall 12a extending toward the bottom 11a. The arc extension wall 12a is formed of, for example, a resin or a ceramic material such as alumina.

[0032] The contact device 3 includes a first fixed terminal 14, a second fixed terminal 15, a first fixed contact 16, a second fixed contact 17, a movable contact piece 20, a first movable contact 26, a second movable contact 27, and a contact piece holding portion 30. The first fixed terminal 14, the second fixed terminal 15, the first fixed contact 16, the second fixed contact 17, the movable contact piece 20, the first movable contact 26, and the second movable contact 27 are formed of a conductive material.

[0033] The first fixed terminal 14 extends in the left-right direction and is supported by the first contact supporting portion 11 c of the contact housing 11 in the housing 2 . Figure 2 yes Figure 1 An enlarged view of the surrounding area of ​​the movable contact piece 20 in FIG. Figure 3 This is a diagram showing the periphery of the first fixed contact 16 as viewed from the separation direction Z2 side. Figures 1 to 3 As shown, the first fixed terminal 14 includes a first surface 14 a , a recess 14 b , and an external connection portion 14 c .

[0034] The first surface 14a is provided at a portion of the surface on the separation direction Z2 side in the housing 2. The first surface 14a has a flat shape along a direction orthogonal to the drive shaft 4. At least a portion of the first surface 14a overlaps with the movable contact piece 20 in the axial direction. The recessed portion 14b is formed to be recessed from the first surface 14a toward the contact direction Z1. Figure 3 As shown in FIG. 1 , when viewed from the separation direction Z2 side, the concave portion 14b is surrounded by the first surface 14a. The external connection portion 14c protrudes from the housing 2a in the left-right direction.

[0035] The second fixed terminal 15 extends in the left-right direction and is supported by the second contact support portion 11d of the contact housing 11 in the housing 2. The second fixed terminal 15 includes a first surface 15a, a recess 15b, and an external connection portion 15c. Figure 1 As shown in FIG. 1 , the second fixed terminal 15 is bilaterally symmetrical with the first fixed terminal 14 with the axis Ax of the drive shaft 4 interposed therebetween, and therefore description thereof will be omitted.

[0036] The first fixed contact 16 is connected to the first fixed terminal 14. The first fixed contact 16 is embedded in the first fixed terminal 14 in a coplanar manner with the first surface 14a of the first fixed terminal 14. The surface of the first fixed contact 16 on the separation direction Z2 side has a flat shape along the direction orthogonal to the drive shaft 4. The first fixed contact 16 is arranged in the recess 14b, and the surface on the separation direction Z2 side is connected to the first surface 14a without a step difference. By arranging the first fixed contact 16 in the recess 14b, the positioning of the first fixed contact 16 becomes easy when the first fixed contact 16 is welded to the first fixed terminal 14.

[0037] The second fixed contact 17 is connected to the second fixed terminal 15. The second fixed contact 17 is symmetrical with the first fixed contact 16 across the axis Ax of the drive shaft 4. The second fixed contact 17 is embedded in the second fixed terminal 15 in a manner coplanar with the first surface 15a of the second fixed terminal 15. The second fixed contact 17 is arranged in the recess 15b, and the surface on the separation direction Z2 side is connected to the first surface 15a without a step difference.

[0038] The movable contact piece 20 extends in the left-right direction in the contact housing 11. The movable contact piece 20 is arranged opposite to the first fixed terminal 14 and the second fixed terminal 15. The movable contact piece 20 includes a second surface 20a. The second surface 20a is arranged at both ends of the movable contact piece 20. In detail, the second surface 20a is arranged opposite to the first surface 14a of the first fixed terminal 14 and the first surface 15a of the second fixed terminal 15. The second surface 20a has a flat shape along the direction orthogonal to the drive shaft 4. In addition, the second surface 20a does not necessarily have to be a flat shape.

[0039] The movable contact piece 20 is movable in a contact direction Z1 for contacting the first fixed contact 16 and the second fixed contact 17 and a separation direction Z2 for moving away from the first fixed contact 16 and the second fixed contact 17 .

[0040] The contact direction Z1 is a direction in which the first movable contact 26 and the second movable contact 27 contact the first fixed contact 16 and the second fixed contact 17 ( Figure 1 The separation direction Z2 is the direction in which the first movable contact 26 and the second movable contact 27 are separated from the first fixed contact 16 and the second fixed contact 17 ( Figure 1 The contact direction Z1 and the separation direction Z2 are consistent with the axial direction.

[0041] The first movable contact 26 is connected to the movable contact piece 20. The first movable contact 26 is arranged opposite to the first fixed contact 16 and can contact the first fixed contact 16. The first movable contact 26 protrudes from the second surface 20a of the movable contact piece 20 toward the first fixed contact 16. The surface of the first movable contact 26 on the contact direction Z1 side has a flat shape along the direction orthogonal to the drive shaft 4. In addition, the first movable contact 26 can be mounted on the second surface 20a, or a part of it can be embedded in the movable contact piece 20.

[0042] like Figure 3 As shown in FIG. 1 , the first movable contact 26 completely overlaps the first fixed contact 16 when viewed from the direction opposite to the first fixed contact 16. In other words, the first movable contact 26 entirely overlaps the first fixed contact 16 in the axial direction. In addition, when viewed from the direction opposite to the first fixed contact 16, the first movable contact 26 includes a contact surface A1 that is smaller than a contact surface A2 of the first fixed contact 16.

[0043] The contact surface A1 is a surface area where the first movable contact 26 can contact the first fixed contact 16. In the present embodiment, the contact surface A1 is a surface area of ​​the first movable contact 26 on the contact direction Z1 side.

[0044] The contact surface A2 is a surface area where the first fixed contact 16 can contact the first movable contact 26. In the present embodiment, the contact surface A2 is a surface area of ​​the first fixed contact 16 on the separating direction Z2 side.

[0045] like Figure 3 As shown in the figure, in the longitudinal direction of the movable contact piece 20, the size of the first movable contact 26 is smaller than the size of the first fixed contact 16. In addition, in the short side direction of the movable contact piece 20, the size of the first movable contact 26 is smaller than the size of the first fixed contact 16. When viewed in the axial direction, the outer edge of the first movable contact 26 is arranged at a position closer to the inside than the outer edge of the first fixed contact 16. Thus, the first fixed contact 16 can be reliably contacted with the first movable contact 26.

[0046] The second movable contact 27 is connected to the movable contact piece 20. The second movable contact 27 is arranged opposite to the second fixed contact 17 and can contact the second fixed contact 17. The second movable contact 27 is symmetrical with the first movable contact 26 across the axis Ax of the drive shaft 4, so the description is omitted. In addition, in the present embodiment, the first movable contact 26 and the first fixed contact 16 are rectangular when viewed in the axial direction, but they may also be circular, and the first movable contact 26 and the first fixed contact 16 may have different shapes.

[0047] The contact piece holding portion 30 holds the movable contact piece 20 via the drive shaft 4. The contact piece holding portion 30 connects the movable contact piece 20 to the drive shaft 4. The contact piece holding portion 30 includes a bracket 24 and a contact spring 25. The movable contact piece 20 is clamped in the axial direction by the upper portion of the bracket 24 and the flange portion 4a of the drive shaft 4. The contact spring 25 is arranged between the bottom of the bracket 24 and the flange portion 4a of the drive shaft 4, and applies force to the drive shaft 4 and the movable contact piece 20 toward the separation direction Z2 side.

[0048] The drive shaft 4 extends along the contact direction Z1 and the separation direction Z2. The drive shaft 4 is connected to the movable contact piece 20 via the contact piece holding portion 30. The drive shaft 4 is movable in the contact direction Z1 and the separation direction Z2 together with the movable contact piece 20.

[0049] The electromagnetic drive device 5 moves the drive shaft 4 in the contact direction Z1 by electromagnetic force. The electromagnetic drive device 5 is arranged below the contact housing 11 in the housing 2.

[0050] The electromagnetic drive device 5 includes a coil 32 , a bobbin 33 , a movable iron core 34 , a fixed iron core 35 , a biasing member 36 , and a yoke 37 .

[0051] The coil 32 is mounted on the outer periphery of the bobbin 33. The bobbin 33 includes a housing portion 33a. The housing portion 33a is provided on the inner periphery of the bobbin 33. The housing portion 33a is cylindrical and extends in the axial direction.

[0052] The movable iron core 34 is disposed in the housing portion 33a. The movable iron core 34 is cylindrical, the drive shaft 4 passes through the center thereof in the axial direction, and is connected to the drive shaft 4 so as to be movable integrally. The movable iron core 34 is movable in the axial direction together with the drive shaft 4.

[0053] The fixed iron core 35 is disposed on the contact direction Z1 side of the movable iron core 34 in the accommodation portion 33 a so as to face the movable iron core 34 . The fixed iron core 35 is fixed to the yoke 37 .

[0054] The urging member 36 is, for example, a coil spring, and is disposed between the movable iron core 34 and the fixed iron core 35. The urging member 36 urges the movable iron core 34 in the separation direction Z2. Therefore, the urging member 36 is disposed between the movable iron core 34 and the fixed iron core 35 in a compressed state.

[0055] The yoke 37 includes a first yoke 37a and a second yoke 37b. The first yoke 37a is plate-shaped and is disposed between the bottom 11a of the contact housing 11 and the winding frame 33. The first yoke 37a overlaps the lower part of the cylindrical part 11b in the left-right direction. The first yoke 37a is connected to the fixed iron core 35. The second yoke 37b is roughly U-shaped, and the bottom is disposed below the winding frame 33. The upper ends of both sides of the second yoke 37b are connected to the first yoke 37a.

[0056] Next, the operation of electromagnetic relay 100 will be described. Figure 1 Indicates a state where no voltage is applied to the coil 32. When no voltage is applied to the coil 32, the movable iron core 34 is prevented from moving in the contact direction Z1 by the biasing member 36. Therefore, the first movable contact 26 and the second movable contact 27 are separated from the first fixed contact 16 and the second fixed contact 17.

[0057] Figure 4 Indicates the state of applying voltage to the coil 32. When voltage is applied to the coil 32 to excite it, the movable iron core 34 overcomes the elastic force of the force-applying member 36 by the electromagnetic force of the coil 32 and moves in the contact direction Z1. As the movable iron core 34 moves, the drive shaft 4 and the movable contact piece 20 move in the contact direction Z1, so that the first movable contact 26 and the second movable contact 27 contact the first fixed contact 16 and the second fixed contact 17.

[0058] When the voltage application to the coil 32 stops, the movable iron core 34 moves in the separation direction Z2 by the elastic force of the urging member 36 , so that the first movable contact 26 and the second movable contact 27 are separated from the first fixed contact 16 and the second fixed contact 17 .

[0059] Here, if Figure 1 and Figure 4 As shown, a pair of permanent magnets 40 for arc extinguishing are provided in the contact housing 11. The permanent magnet 40 generates a magnetic flux in the left-right direction at a position between the first fixed contact 16 and the first movable contact 26. If the current flows in the up-down direction between the first fixed contact 16 and the first movable contact 26, the Lorentz force in the width direction of the movable contact piece 20 acts on the arc, and the arc is stretched to the arc extension wall 12a. At this time, for example, if there is a step difference between the first fixed contact 16 and the first fixed terminal 14, the arc is stuck to the step portion and the extension of the arc is hindered.

[0060] However, in the electromagnetic relay 100 of the present embodiment, since the first fixed contact 16 is embedded in the first fixed terminal 14 in a manner coplanar with the first surface 14a of the first fixed terminal 14, it is possible to suppress the arc from sticking between the first fixed contact 16 and the first fixed terminal 14. Thus, the arc can be extinguished quickly. In addition, even if an arc is generated between the second fixed contact 17 and the second movable contact 27, the same effect as described above can be obtained.

[0061] In addition, since the contact surface A1 of the first movable contact 26 is smaller than the contact surface A2 of the first fixed contact 16, even if the position of the movable contact piece 20 is displaced when the movable contact piece 20 moves, the first movable contact 26 can be reliably contacted with the first fixed contact 16. That is, it is possible to prevent the first fixed terminal 14 from contacting with the first movable contact 26. In addition, the second movable contact 27 and the second fixed contact 17 can also obtain the same effect as described above.

[0062] The above is a description of an embodiment of an electromagnetic relay according to one embodiment of the present invention, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the main purpose of the invention. For example, the structure of the electromagnetic drive device 5 can also be changed. The shape or configuration of the coil 32, the winding frame 33, the movable iron core 34, the force member 36, and the yoke 37 can also be changed. The shape or configuration of the housing 2, the contact device 3, the contact housing 11, and the contact cover 12 can also be changed.

[0063] Figure 5 FIG. 2 is an enlarged view of the movable contact piece 20 and its surroundings of the first modified example. Figure 5 As shown, the first modified example is an embodiment in which the shapes of the first fixed contact 16 and the first movable contact 26 in the above-mentioned embodiment are interchanged. Specifically, the first movable contact 26 is embedded in the movable contact piece 20 in a manner coplanar with the second surface 20a of the movable contact piece 20. The first movable contact 26 is arranged in a recessed portion 20b formed by being recessed from the second surface 20a in the separation direction Z2.

[0064] The first fixed contact 16 protrudes from the first surface 14a of the first fixed terminal 14 toward the first movable contact 26. In this case, it is possible to suppress the arc from being stuck between the movable contact piece 20 and the first movable contact 26. In addition, as in the above-mentioned embodiment, the first movable contact 26 can be reliably contacted with the first fixed contact 16. In addition, the second fixed contact 17 and the second movable contact 27 are bilaterally symmetrical with the first fixed contact 16 and the first movable contact 26 across the axis Ax of the drive shaft 4.

[0065] Figure 62 is an enlarged view of the movable contact piece 20 and its surroundings of the second modification. The second modification is an embodiment in which the step difference is eliminated at the contact on the cathode side where the arc is difficult to extend when the electromagnetic relay 100 has polarity. The contact on the anode side protrudes toward the contact on the cathode side. For example, Figure 6 In the embodiment, the first fixed contact 16 and the second movable contact 27 are contacts on the cathode side, and the second fixed contact 17 and the first movable contact 26 are contacts on the anode side.

[0066] The first fixed contact 16 is arranged in the recess 14b of the first fixed terminal 14 in a manner coplanar with the first surface 14a of the first fixed terminal 14. The first movable contact 26 protrudes from the second surface 20a of the movable contact piece 20 toward the first fixed contact 16. When viewed from the direction opposite to the first fixed contact 16, the first movable contact 26 includes a contact surface A1 that is smaller than the first fixed contact 16. In the second modified example, the second surface 20a of the movable contact piece 20 is an example of a third surface.

[0067] The second fixed contact 17 protrudes from the first surface 15a of the second fixed terminal 15 toward the second movable contact 27. When viewed from the direction opposite to the second movable contact 27, the second fixed contact 17 includes a contact surface A2 that is smaller than the second movable contact 27. In the second modified example, the first surface 15a of the second fixed terminal 15 is an example of the second surface. The second movable contact 27 is arranged in the recess 20b of the movable contact piece 20 in a manner coplanar with the second surface 20a of the movable contact piece 20.

[0068] Figure 7 This is an enlarged schematic diagram of the movable contact piece 120 and its surroundings of the third modification. In the third modification, the contact direction Z1 and the separation direction Z2 are opposite to those of the above embodiment. The first fixed terminal 114 and the second fixed terminal 115 are composed of substantially cylindrical terminals extending in the axial direction.

[0069] like Figure 7 As shown, the first fixed contact 116 protrudes from the first surface 114a of the first fixed terminal 114 toward the first movable contact 126. The second fixed contact 117 protrudes from the first surface 115a of the second fixed terminal 115 toward the second movable contact 127. The first movable contact 126 and the second movable contact 127 are respectively arranged in the recess 120b of the movable contact piece 120 in a manner coplanar with the second surface 120a of the movable contact piece 120.

[0070] Figure 8 FIG. 1 is an enlarged schematic diagram of the periphery of the movable contact piece 120 of the fourth modified example. Figure 8As shown, the fourth modification is an embodiment in which the shapes of the first fixed contact 116 and the first movable contact 126, and the second fixed contact 117 and the second movable contact 127 in the third modification are interchanged. The first fixed contact 116 is arranged in the concave portion 114b of the first fixed terminal 114 in a manner coplanar with the first surface 114a of the first fixed terminal 114. The second fixed contact 117 is arranged in the concave portion 115b of the second fixed terminal 115 in a manner coplanar with the first surface 115a of the second fixed terminal 115. The first movable contact 126 protrudes from the second surface 120a of the movable contact piece 120 toward the first fixed contact 116. The second movable contact 127 protrudes from the second surface 120a of the movable contact piece 120 toward the second fixed contact 117.

[0071] According to the present invention, it is possible to suppress the arc from sticking when the movable contact is separated from the fixed contact.

Claims

1. An electromagnetic relay, characterized in that: have: A first fixed terminal including a first surface; a second fixed terminal including a second surface and arranged at a distance from the first fixed terminal; A movable contact piece including a third surface disposed opposite to the first surface and the second surface; a first fixed contact embedded in the first fixed terminal in a manner coplanar with the first surface; a second fixed contact protruding from the second surface of the second fixed terminal toward the third surface; a first movable contact, which is arranged opposite to the first fixed contact, can be in contact with the first fixed contact, and protrudes from the third surface toward the first surface. a second movable contact arranged opposite to the second fixed contact, capable of contacting the second fixed contact, and embedded in the movable contact piece in a manner coplanar with the third surface; A drive shaft connected to the movable contact piece so as to be movable as one; as well as an electromagnetic drive device that moves the drive shaft in a direction in which the first fixed contact contacts the first movable contact and the second fixed contact contacts the second movable contact, and in a direction in which the first fixed contact separates from the first movable contact and the second fixed contact separates from the second movable contact, The first fixed contact and the second movable contact are cathode contacts.

2. The electromagnetic relay according to claim 1, characterized in that: The first surface of the first fixed terminal has a flat shape along a direction orthogonal to the drive axis.

3. The electromagnetic relay according to claim 2, characterized in that The first fixed terminal includes a recessed portion recessed from the first surface toward the contact direction. The first fixed contact is arranged in the recessed portion of the first fixed terminal.

4. The electromagnetic relay according to claim 1, characterized in that: The third surface of the movable contact piece has a flat shape along a direction orthogonal to the drive axis.

5. The electromagnetic relay according to claim 4, characterized in that: The movable contact piece includes a recessed portion formed from the third surface in the separation direction. The second movable contact is arranged in the recessed portion of the movable contact piece.

6. The electromagnetic relay according to claim 1, characterized in that: The first movable contact includes a first contact surface that is smaller than the first fixed contact when viewed from a direction opposite to the first fixed contact. The second fixed contact includes a second contact surface that is smaller than the second movable contact when viewed from a direction opposing the second movable contact.

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