electromagnetic relay

Abstract

To improve heat dissipation in a fixed terminal and also reduce a thermal effect from the fixed terminal to a substrate, while preventing an increase in size of an electromagnetic relay.SOLUTION: An electromagnetic relay comprises a housing, a first fixed terminal, a movable contact piece, and a drive unit. The first fixed terminal includes a first main member and a first layer member. The first main member protrudes from the inside of the housing to the outside thereof. The first layer member is a component separate from the first main member. The first layer member is stacked on the first main member. The first layer member protrudes from the inside of the housing to the outside thereof. The first layer member has a shape branching from the first main member. The movable contact piece is disposed inside the housing and faces the first fixed terminal. The drive unit moves the movable contact piece in a contact direction and in a separating direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] The electromagnetic relay comprises a fixed terminal, a movable contact piece, and a housing. The fixed terminal protrudes from inside the housing to the outside of the housing. The movable contact piece is provided so as to be movable in a contact direction and a separation direction. The contact direction is the direction in which the movable contact piece contacts the fixed terminal. The separation direction is the direction in which the movable contact piece moves away from the fixed terminal. When the movable contact piece contacts the fixed terminal, a current flows through the fixed terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-057225 Summary of the Invention [Problem to be solved by the invention]

[0004] When a large current flows through an electromagnetic relay, the amount of heat generated in the fixed terminal increases. Therefore, it is desirable to improve heat dissipation by increasing the surface area of the fixed terminal. However, increasing the size of the fixed terminal to increase its surface area results in an increase in the size of the electromagnetic relay. Furthermore, increasing the amount of heat generated in the fixed terminal increases the thermal impact from the fixed terminal on the circuit board. An object of the present invention is to improve the heat dissipation of the fixed terminal and reduce the thermal impact from the fixed terminal on the circuit board while preventing an increase in the size of the electromagnetic relay. [Means for solving the problem]

[0005] An electromagnetic relay according to one aspect of the present invention comprises a housing, a first fixed terminal, a movable contact piece, and a drive unit. The first fixed terminal includes a first main member and a first layer member. The first main member protrudes from within the housing to the outside of the housing. The first layer member is separate from the first main member. The first layer member is stacked on the first main member. The first layer member protrudes from within the housing to the outside of the housing. The first layer member has a shape branching off from the first main member. The movable contact piece is disposed within the housing and faces the first fixed terminal. The drive unit moves the movable contact piece in a contact direction and a separation direction. The contact direction is the direction in which the movable contact piece contacts the first fixed terminal. The separation direction is the direction in which the movable contact piece moves away from the first fixed terminal.

[0006] In the electromagnetic relay according to this aspect, the first fixed terminal includes a first main member and a first layer member that are separate from each other, and the first layer member branches off from the first main member. This increases the surface area of the first fixed terminal while preventing the first fixed terminal from becoming too large. This improves the heat dissipation performance of the first fixed terminal while preventing the electromagnetic relay from becoming too large. Furthermore, the current flowing through the first fixed terminal is split between the first main member and the first layer member. Therefore, when the electromagnetic relay is mounted on a circuit board, heat from the first fixed terminal is dispersed between the first main member and the first layer member and then transferred to the circuit board. This reduces the thermal impact from the first fixed terminal on the circuit board.

[0007] The first layer member may include a connection portion and a terminal portion. The connection portion may be disposed on the first main member within the housing. At least a portion of the terminal portion may be disposed outside the housing. The terminal portion may be disposed at a distance from the first main member. In this case, by disposing the terminal portion at a distance from the first main member, the surface area of the first fixed terminal is increased, thereby improving the heat dissipation of the first fixed terminal.

[0008] The first layer member may further include a step portion disposed between the connection portion and the terminal portion. The first layer member may be bent between the connection portion and the step portion and between the step portion and the terminal portion. In this case, the step portion spaces the terminal portion from the first main member, thereby improving the heat dissipation of the first fixed terminal.

[0009] The housing may include a base supporting a first fixed terminal. The first fixed terminal may protrude from a bottom surface of the base to the outside of the housing. The lower end of the first main member may be located below the bottom surface of the base. The lower end of the first layer member may be located below the bottom surface of the base. In this case, the first main member and the first layer member can be easily connected to the board.

[0010] The base may include legs protruding downward from the bottom surface. The lower end of the first main member may be located lower than the lower ends of the legs. The lower end of the first layer member may be located lower than the lower ends of the legs. In this case, the first main member and the first layer member are easily connected to the board. Furthermore, contact of the legs with the board ensures a space between the bottom surface of the base and the board. Therefore, a portion of the first main member and a portion of the first layer member are disposed in the space between the bottom surface of the base and the board. This improves the heat dissipation of the first fixed terminal.

[0011] The first main member and the first layer member may have a plate-like shape. The thickness of the first layer member may be different from the thickness of the first main member. In this case, the temperature rise values in the first layer member and the first main member can be changed as desired depending on the ratio of the thickness of the first layer member to the thickness of the first main member.

[0012] The electromagnetic relay may further include a second fixed terminal. The second fixed terminal may include a second main member and a second layer member. The second main member may protrude from inside the housing to outside the housing. The second layer member may be separate from the second main member. The second layer member may be stacked on the second main member. The second layer member may protrude from inside the housing to outside the housing. The second layer member may have a shape branching from the second main member. In this case, the surface area of the second fixed terminal is increased while preventing the second fixed terminal from becoming larger. This improves the heat dissipation performance of the second fixed terminal while preventing the electromagnetic relay from becoming larger. In addition, the thermal influence from the second fixed terminal to the board is reduced.

[0013] The first layer member and the second layer member may be disposed on the same side of the first main member and the second main member, in which case the first layer member and the second layer member are disposed compactly.

[0014] The first layer member and the second layer member may be disposed on opposite sides of the first main member and the second main member, which improves the heat dissipation properties of each of the first layer member and the second layer member.

[0015] The first fixed terminal may further include a third layer member. The third layer member may be separate from the first main member and the first layer member. The third layer member may protrude from inside the housing to outside the housing. The third layer member may have a shape branching from the first main member. In this case, the heat dissipation performance of the first fixed terminal is further improved. Also, the thermal influence from the first fixed terminal to the board is further reduced.

[0016] The third layer member may be stacked on the first layer member, with the first layer member and the third layer member stacked on the same side of the first main member, thereby allowing the first layer member and the third layer member to be compactly arranged.

[0017] The third layer member may be stacked on the first main member on the opposite side from the first layer member. In this case, the first layer member and the third layer member are stacked on opposite sides of the first main member, thereby improving the heat dissipation properties of each of the first layer member and the third layer member. [Effects of the Invention]

[0018] According to the present invention, the heat dissipation performance of the fixed terminal is improved while preventing the electromagnetic relay from becoming large, and the thermal influence from the fixed terminal to the circuit board is reduced. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is an external perspective view of an electromagnetic relay according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of the inside of the electromagnetic relay. [Figure 3] FIG. 2 is a top view of the electromagnetic relay when the moving member is in the open position. [Figure 4] FIG. 2 is a top view of the electromagnetic relay when the moving member is in a closed position. [Figure 5] FIG. 2 is a side view of the inside of the electromagnetic relay. [Figure 6] FIG. 2 is a perspective view of a first fixed terminal. [Figure 7] FIG. 2 is an enlarged side view of the lower part of the electromagnetic relay. [Figure 8] FIG. 2 is a perspective view of the electromagnetic relay as seen from below. [Figure 9] FIG. 10 is a side view showing a lower part of the electromagnetic relay according to the first modified example. [Figure 10] FIG. 10 is a side view showing a lower part of an electromagnetic relay according to a second modified example. [Figure 11] FIG. 11 is a side view showing a lower part of an electromagnetic relay according to a third modified example. [Figure 12] FIG. 10 is a perspective view of an electromagnetic relay according to another embodiment, as viewed from below. DETAILED DESCRIPTION OF THE INVENTION

[0020] An electromagnetic relay 1 according to an embodiment will be described below with reference to the drawings. Fig. 1 is an external perspective view of the electromagnetic relay 1 according to the first embodiment. Fig. 2 is an internal perspective view of the electromagnetic relay 1. Figs. 3 and 4 are top views of the inside of the electromagnetic relay 1.

[0021] The electromagnetic relay 1 includes a contact device 2, a housing 3, and a drive device 4. The contact device 2 and the drive device 4 are disposed within the housing 3. The housing 3 includes a base 11 and a case 12. The case 12 is omitted from FIGS. 2 to 4. The base 11 supports the contact device 2 and the drive device 4.

[0022] In the following description, the direction from the base 11 toward the contact device 2 and the drive device 4 is defined as the upward direction, and the opposite direction is defined as the downward direction. The direction from the drive device 4 toward the contact device 2 is defined as the forward direction, and the opposite direction is defined as the backward direction. The direction perpendicular to the up-down direction and the front-back direction is defined as the left-right direction.

[0023] Contact device 2 includes a first fixed terminal 13, a second fixed terminal 14, a first movable contact piece 15, a second movable contact piece 16, and a moving member 17. First fixed terminal 13 and second fixed terminal 14 are formed of a conductive material such as copper. First fixed terminal 13 and second fixed terminal 14 each extend in the vertical direction.

[0024] First fixed terminal 13 and second fixed terminal 14 are arranged apart from each other in the left-right direction. First fixed terminal 13 and second fixed terminal 14 are fixed to base 11. First fixed terminal 13 and second fixed terminal 14 protrude from inside housing 3 to the outside of housing 3. First fixed terminal 13 and second fixed terminal 14 protrude downward from base 11.

[0025] First fixed contact 21 and third fixed contact 23 are connected to first fixed terminal 13. Second fixed contact 22 and fourth fixed contact 24 are connected to second fixed terminal 14. First to fourth fixed contacts 21-24 are formed of a conductive material such as silver or copper.

[0026] The first movable contact piece 15 and the second movable contact piece 16 extend in the left-right direction. The first movable contact piece 15 and the second movable contact piece 16 are separate from each other. The first movable contact piece 15 and the second movable contact piece 16 are made of a conductive material such as copper.

[0027] The first movable contact piece 15 is arranged to face the first fixed terminal 13 and the second fixed terminal 14. A first movable contact 25 and a second movable contact 26 are connected to the first movable contact piece 15. The first movable contact 25 is arranged to face the first fixed contact 21. The second movable contact 26 is arranged to face the second fixed contact 22.

[0028] The second movable contact piece 16 is arranged to face the first fixed terminal 13 and the second fixed terminal 14. A third movable contact 27 and a fourth movable contact 28 are connected to the second movable contact piece 16. The third movable contact 27 is arranged to face the third fixed contact 23. The fourth movable contact 28 is arranged to face the fourth fixed contact 24. The first to fourth movable contacts 25-28 are formed of a conductive material such as silver or copper.

[0029] The movable member 17 holds the first movable contact piece 15 and the second movable contact piece 16. The movable member 17 is made of an electrically insulating resin. The movable member 17 is movable in the forward and backward directions. The movable member 17 is movable between a closed position and an open position. In FIG. 3, the movable member 17 is positioned in the open position. When the movable member 17 is in the open position, the movable contacts 25-28 are separated from the fixed contacts 21-24, respectively. In FIG. 4, the movable member 17 is positioned in the closed position. When the movable member 17 is in the closed position, the movable contacts 25-28 are in contact with the fixed contacts 21-24, respectively.

[0030] The driving device 4 moves the first movable contact piece 15 and the second movable contact piece 16 by electromagnetic force. The driving device 4 moves the first movable contact piece 15 and the second movable contact piece 16 in a contact direction and a separation direction. The contact direction is the direction in which the movable contacts 25-28 contact the fixed contacts 21-24. The separation direction is the direction in which the movable contacts 25-28 move away from the fixed contacts 21-24. In this embodiment, the contact direction is backward, and the separation direction is forward.

[0031] The drive unit 4 includes a coil 31, a spool 32, a movable iron core 33, a fixed iron core 34, and a yoke 35. The coil 31 is wound around the spool 32. At least a portion of the movable iron core 33 is disposed within the spool 32. The movable iron core 33 is provided so as to be movable in the front-to-rear direction. The fixed iron core 34 is disposed within the spool 32. The fixed iron core 34 is disposed opposite the movable iron core 33. When current is applied to the coil 31, it generates an electromagnetic force that moves the movable iron core 33.

[0032] The movable iron core 33 is connected to the moving member 17. The movable iron core 33 moves in the contact direction in response to the magnetic force generated by the coil 31. As the movable iron core 33 moves, the moving member 17 moves to the closed position. The yoke 35 is disposed so as to surround the coil 31. The yoke 35 is disposed on the magnetic circuit formed by the coil 31.

[0033] The electromagnetic relay 1 includes a first return spring 36 and a second return spring 37. The first return spring 36 and the second return spring 37 are disposed between the moving member 17 and the driving device 4. The first return spring 36 and the second return spring 37 bias the moving member 17 in the opening direction.

[0034] Next, we will explain the operation of the electromagnetic relay 1. When the coil 31 is not energized, the drive unit 4 is not excited. In this case, the moving member 17, together with the movable iron core 33, is pressed in the opening direction by the elastic forces of the return springs 36 and 37, and the moving member 17 is located in the open position shown in FIG.

[0035] In this state, the first movable contact piece 15 and the second movable contact piece 16 are also pressed in the opening direction via the movable member 17. Therefore, when the movable member 17 is in the open position, the first movable contact 25 and the second movable contact 26 are separated from the first fixed contact 21 and the second fixed contact 22. Similarly, when the movable member 17 is in the open position, the third movable contact 27 and the fourth movable contact 28 are separated from the third fixed contact 23 and the fourth fixed contact 24.

[0036] When the coil 31 is energized, the drive unit 4 is excited. In this case, the electromagnetic force of the coil 31 moves the movable core 33 in the contact direction against the elastic force of the return springs 36 and 37. As a result, the movable member 17, the first movable contact piece 15, and the second movable contact piece 16 all move in the contact direction. Therefore, as shown in FIG. 4, the movable member 17 moves to the closed position.

[0037] As a result, when the moving member 17 is in the closed position, the first movable contact 25 and the second movable contact 26 come into contact with the first fixed contact 21 and the second fixed contact 22, respectively. Similarly, when the moving member 17 is in the closed position, the third movable contact 27 and the fourth movable contact 28 come into contact with the third fixed contact 23 and the fourth fixed contact 24, respectively. As a result, the first movable contact piece 15 and the second movable contact piece 16 are electrically connected to the first fixed terminal 13 and the second fixed terminal 14.

[0038] When the current to the coil 31 is stopped and the coil 31 is demagnetized, the movable core 33 is pressed in the opening direction by the elastic forces of the return springs 36 and 37. As a result, the moving member 17, the first moving contact piece 15, and the second moving contact piece 16 all move in the opening direction. Therefore, as shown in Figure 3, the moving member 17 moves to the open position.

[0039] As a result, when the moving member 17 is in the open position, the first moving contact 25 and the second moving contact 26 are separated from the first fixed contact 21 and the second fixed contact 22. Similarly, when the moving member 17 is in the open position, the third moving contact 27 and the fourth moving contact 28 are separated from the third fixed contact 23 and the fourth fixed contact 24.

[0040] When a large current flows through electromagnetic relay 1, first and second fixed terminals 13, 14 and first and second movable contact pieces 15, 16 become hot. As shown in Fig. 1, in electromagnetic relay 1 according to this embodiment, first fixed terminal 13 and second fixed terminal 14 have a branched shape in order to improve the heat dissipation of electromagnetic relay 1. The structures of first fixed terminal 13 and second fixed terminal 14 will be described in detail below.

[0041] FIG. 5 is a side view of the inside of the electromagnetic relay 1. As shown in FIG. 5, the first fixed terminal 13 includes a first main member 51 and a first layer member 52. The first main member 51 and the first layer member 52 have a plate-like shape. The first main member 51 and the first layer member 52 protrude from inside the housing 3 to outside the housing 3. The first main member 51 and the first layer member 52 are supported by the base 11. The first main member 51 and the first layer member 52 protrude from above the base 11, pass through the base 11, and below the bottom surface 47 of the base 11.

[0042] 1 and 5, the base 11 includes a plurality of legs 43-46. The legs 43-46 protrude downward from a bottom surface 47 of the base 11. As shown in Fig. 5, the legs 43-46 come into contact with a substrate 100 on which the electromagnetic relay 1 is mounted.

[0043] FIG. 6 is a perspective view of the first fixed terminal 13. FIG. 7 is an enlarged side view of the lower part of the electromagnetic relay 1. As shown in FIGS. 6 and 7, the first main member 51 includes a first surface 131, a second surface 132, a first side surface 133, and a second side surface 134. The first surface 131 faces forward. The second surface 132 is located on the opposite side of the first surface 131. The second surface 132 faces rearward.

[0044] The first layer member 52 is separate from the first main member 51. The first layer member 52 is laminated on the first main member 51. The first layer member 52 is disposed facing the first surface 131 of the first main member 51. The first layer member 52 is connected to the first surface 131. The first layer member 52 is connected to the first main member 51 by, for example, welding or caulking. The first layer member 52 has a plate-like shape that is thinner than the first main member 51.

[0045] As shown in Figure 7, the thickness T2 of the first layer member 52 is smaller than the thickness T1 of the first main member 51. The area of the horizontal cross section of the first layer member 52 is smaller than the area of the horizontal cross section of the first main member 51. The upper part of the first layer member 52 faces the movable contact pieces 15, 16 inside the housing 3. The first fixed contact 21 and the third fixed contact 23 are attached to the upper part of the first layer member 52. The lower part of the first layer member 52 has a bent shape so as to branch off from the first main member 51.

[0046] In detail, the first layer member 52 includes a connecting portion 53, a step portion 54, and a terminal portion 55. The first layer member 52 is bent between the connecting portion 53 and the step portion 54. The first layer member 52 is bent between the step portion 54 and the terminal portion 55. The connecting portion 53 extends in the vertical direction. The connecting portion 53 is connected to the first main member 51. The connecting portion 53 is disposed on the first main member 51 within the housing 3.

[0047] The step portion 54 is disposed between the connection portion 53 and the terminal portion 55. The step portion 54 extends in the front-rear direction from the connection portion 53. The terminal portion 55 extends downward from the step portion 54. The terminal portion 55 is connected to the board 100. The step portion 54 and the terminal portion 55 are disposed outside the housing 3. The step portion 54 and the terminal portion 55 are disposed below the bottom surface 47 of the base 11. The terminal portion 55 is disposed at a distance from the first main member 51 in the front-rear direction.

[0048] 7, the lower end 511 of the first main member 51 is located lower than the bottom surface 47 of the base 11. The lower end 521 of the first layer member 52 is located lower than the bottom surface 47 of the base 11. The lower end 511 of the first main member 51 is located lower than the lower ends 431 and 441 of the legs 43 and 44. The lower end 521 of the first layer member 52 is located lower than the lower ends 431 and 441 of the legs 43 and 44. The first layer member 52, together with the first main member 51, is electrically connected to the substrate 100.

[0049] FIG. 8 is a perspective view of the electromagnetic relay 1 as viewed from below. As shown in FIGS. 1 and 8, the second fixed terminal 14 has a shape similar to that of the first fixed terminal 13. The second fixed terminal 14 includes a second main member 61 and a second layer member 62. The second main member 61 and the second layer member 62 have a plate-like shape. The second main member 61 and the second layer member 62 protrude from inside the housing 3 to outside the housing 3. The second main member 61 and the second layer member 62 are supported by the base 11. The second main member 61 and the second layer member 62 protrude from above the base 11, pass through the base 11, and below the bottom surface 47 of the base 11.

[0050] The second layer member 62 is separate from the second main member 61. The second layer member 62 is layered on the second main member 61. The second layer member 62 is connected to the second main member 61 by, for example, welding or crimping. The second layer member 62 has a plate-like shape that is thinner than the second main member 61. The horizontal cross-sectional area of the second layer member 62 is smaller than the horizontal cross-sectional area of the second main member 61. The upper part of the second layer member 62 faces the movable contact pieces 15, 16 inside the housing 3. The second fixed contact 22 and the fourth fixed contact 24 are attached to the upper part of the second layer member 62. The lower part of the second layer member 62 has a bent shape that branches off from the second main member 61.

[0051] The first layer member 52 and the second layer member 62 are arranged in the same direction relative to the first main member 51 and the second main member 61. That is, the first layer member 52 is arranged in front of the first main member 51. The second layer member 62 is arranged in front of the second main member 61. Alternatively, the first layer member 52 may be arranged behind the first main member 51. The second layer member 62 may be arranged behind the second main member 61.

[0052] In the electromagnetic relay 1 according to the present embodiment described above, first fixed terminal 13 includes first main member 51 and first layer member 52 that are separate from each other, and first layer member 52 branches off from first main member 51. This increases the surface area of first fixed terminal 13 while preventing an increase in size of first fixed terminal 13. This improves the heat dissipation performance of first fixed terminal 13 while preventing an increase in size of electromagnetic relay 1.

[0053] The current flowing through the first fixed terminal 13 is divided between the first main member 51 and the first layer member 52. Therefore, when the electromagnetic relay 1 is attached to the circuit board 100, the heat from the first fixed terminal 13 is dispersed between the first main member 51 and the first layer member 52 and then transferred to the circuit board 100. This reduces the thermal influence from the first fixed terminal 13 to the circuit board 100. Furthermore, because the thicknesses of the first main member 51 and the first layer member 52 are reduced, the processing accuracy of the first main member 51 and the first layer member 52 is improved. For example, the first layer member 52 can be easily bent.

[0054] Second fixed terminal 14 includes a second main member 61 and a second layer member 62. Second main member 61 and second layer member 62 have the same structures as first main member 51 and first layer member 52, respectively. Therefore, second fixed terminal 14 also provides the same effects as first fixed terminal 13.

[0055] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0056] The structures of the contact device 2 and the drive device 4 are not limited to those in the above embodiment and may be modified. For example, in the above embodiment, the electromagnetic relay 1 is a so-called plunger type, but in other types of electromagnetic relays such as a hinge type, a fixed terminal having a structure similar to the first fixed terminal 13 described above may be provided.

[0057] The shapes or arrangements of the first fixed terminal 13, the second fixed terminal 14, the first movable contact piece 15, and the second movable contact piece 16 may be changed. For example, the first movable contact piece 15 and the second movable contact piece 16 may be integrated. That is, the first to fourth movable contacts 25-28 may be connected to the integrated movable contact piece. Alternatively, the second movable contact piece 16, the third and fourth movable contacts 27, 28, and the third and fourth fixed contacts 23, 24 may be omitted.

[0058] First fixed contact 21 and third fixed contact 23 may be integrated with first fixed terminal 13. First fixed contact 21 and third fixed contact 23 may be omitted. Second fixed contact 22 and fourth fixed contact 24 may be integrated with second fixed terminal 14. Second fixed contact 22 and fourth fixed contact 24 may be omitted.

[0059] The first movable contact 25 and the second movable contact 26 may be integral with the first movable contact piece 15. The first movable contact 25 and the second movable contact 26 may be omitted. The third movable contact 27 and the fourth movable contact 28 may be integral with the second movable contact piece 16. The third movable contact 27 and the fourth movable contact 28 may be omitted.

[0060] In the above embodiment, the entire terminal portion 55 of the first layer member 52 is located outside the housing 3. However, a portion of the terminal portion 55 of the first layer member 52 may be located inside the housing 3. In other words, the first layer member 52 may be bent outside the housing 3 or may be bent inside the housing 3.

[0061] In the above embodiment, the thickness T2 of the first layer member 52 is smaller than the thickness T1 of the first main member 51. However, as in a first modified example shown in FIG. 9 , the thickness T2 of the first layer member 52 may be the same as the thickness T1 of the first main member 51. Alternatively, the thickness T2 of the first layer member 52 may be greater than the thickness T1 of the first main member 51. As in the first fixed terminal 13 according to the first modified example, by adjusting the thickness T2 of the first layer member 52 and the thickness T1 of the first main member 51, the temperature rise values of the first layer member 52 and the first main member 51 can be adjusted as desired. Note that, although not shown, the second fixed terminal 14 may also have a structure similar to that of the first fixed terminal 13 according to the first modified example.

[0062] 10 is a side view showing a first fixed terminal 13 according to a second modified example. As shown in FIG. 10, the first fixed terminal 13 may further include a third layer member 56. The third layer member 56 is separate from the first main member 51 and the first layer member 52, protrudes from inside the housing 3 to outside the housing 3, and has a shape branching off from the first main member 51. The third layer member 56 has a curved shape similar to the first layer member 52. The third layer member 56 is layered on the first layer member 52. The first layer member 52 is disposed between the first main member 51 and the third layer member 56.

[0063] In first fixed terminal 13 according to the second modification, third layer member 56 further increases the surface area of first fixed terminal 13. This further improves the heat dissipation properties of first fixed terminal 13. Although not shown, second fixed terminal 14 may also have a structure similar to that of first fixed terminal 13 according to the second modification.

[0064] 11 is a side view showing a first fixed terminal 13 according to a third modified example. As shown in FIG. 11, a third layer member 56 may be stacked on the first main member 51 on the side opposite to the first layer member 52. The third layer member 56 is disposed opposite to the second surface 132 of the first main member 51. The third layer member 56 is connected to the second surface 132.

[0065] First main member 51 is disposed between first layer member 52 and third layer member 56. Third layer member 56 has a shape that is bent symmetrically with first layer member 52 relative to first main member 51. In first fixed terminal 13 according to the third modified example, third layer member 56 also further improves heat dissipation. Although not shown, second fixed terminal 14 may also have a structure similar to that of first fixed terminal 13 according to the third modified example.

[0066] In the first embodiment described above, the first layer member 52 and the second layer member 62 are disposed on the same side of the first main member 51 and the second main member 61. However, the first layer member 52 and the second layer member 62 may be disposed on opposite sides of the first main member 51 and the second main member 61. For example, as shown in FIG. 12 , the first layer member 52 may be disposed behind the first main member 51, and the second layer member 62 may be disposed in front of the second main member 61. Alternatively, the first layer member 52 may be disposed in front of the first main member 51, and the second layer member 62 may be disposed behind the second main member 61. [Industrial Applicability]

[0067] According to the present invention, the heat dissipation performance of the fixed terminal is improved while preventing the electromagnetic relay from becoming large, and the thermal influence from the fixed terminal to the circuit board is reduced. [Explanation of symbols]

[0068] 3: Housing, 4: Drive unit, 11: Base, 13: First fixed terminal, 14: Second fixed terminal, 15: First movable contact piece, 51: First main member, 52: First layer member, 53: Connection portion, 54: Step portion, 55: Terminal portion, 56: Third layer member, 43-46: Leg portion, 61: Second main member, 62: Second layer member

Claims

1. Housing and a first fixed terminal including: a first main member protruding from within the housing to the outside of the housing; and a first layer member that is separate from the first main member, stacked on the first main member, protruding from within the housing to the outside of the housing, and having a shape branched from the first main member; a first fixed contact connected to the first fixed terminal; a movable contact piece disposed within the housing and facing the first fixed terminal; a drive device that moves the movable contact piece in a contact direction and a separation direction, the contact direction being a direction in which the movable contact piece comes into contact with the first fixed terminal, and the separation direction being a direction in which the movable contact piece moves away from the first fixed terminal; Equipped with the first layer member is stacked on the first main member at the same height as the first fixed contact within the housing; Electromagnetic relay.

2. The first layer member is a connection portion disposed on the first main member within the housing; a terminal portion at least partially disposed outside the housing and spaced apart from the first main member; Including, 2. The electromagnetic relay according to claim 1.

3. the first layer member further includes a step portion disposed between the connection portion and the terminal portion, the first layer member is bent between the connection portion and the step portion and between the step portion and the terminal portion; 3. The electromagnetic relay according to claim 2.

4. the housing includes a base supporting the first fixed terminal; the first fixed terminal protrudes from the bottom surface of the base to the outside of the housing, a lower end of the first main member is located below a bottom surface of the base, The lower end of the first layer member is located below the bottom surface of the base.

4. An electromagnetic relay according to claim 1.

5. A housing, a first fixed terminal including: a first main member protruding from within the housing to the outside of the housing; and a first layer member that is separate from the first main member, stacked on the first main member, protruding from within the housing to the outside of the housing, and having a shape branched from the first main member; a movable contact piece disposed within the housing and facing the first fixed terminal; a drive device that moves the movable contact piece in a contact direction and a separation direction, the contact direction being a direction in which the movable contact piece comes into contact with the first fixed terminal, and the separation direction being a direction in which the movable contact piece moves away from the first fixed terminal; Equipped with the housing includes a base supporting the first fixed terminal; the first fixed terminal protrudes from the bottom surface of the base to the outside of the housing, a lower end of the first main member is located below a bottom surface of the base, a lower end of the first layer member is located below a bottom surface of the base, the base includes legs that protrude downward from the bottom surface; a lower end of the first main member is located lower than a lower end of the leg portion, The lower end of the first layer member is located below the lower end of the leg portion. Electromagnetic relay.

6. the first main member and the first layer member have a plate-like shape, The thickness of the first layer member is different from the thickness of the first main member.

6. An electromagnetic relay according to claim 1.

7. a second fixed terminal including a second main member protruding from within the housing to the outside of the housing, and a second layer member that is separate from the second main member, stacked on the second main member, protruding from within the housing to the outside of the housing, and having a shape branched from the second main member; 7. An electromagnetic relay according to claim 1.

8. the first layer member and the second layer member are disposed on the same side with respect to the first main member and the second main member; 8. An electromagnetic relay according to claim 7.

9. the first layer member and the second layer member are disposed on opposite sides of the first main member and the second main member; 8. An electromagnetic relay according to claim 7.

10. A housing; a first fixed terminal including: a first main member protruding from within the housing to the outside of the housing; and a first layer member that is separate from the first main member, stacked on the first main member, protruding from within the housing to the outside of the housing, and having a shape branched from the first main member; a movable contact piece disposed within the housing and facing the first fixed terminal; a drive device that moves the movable contact piece in a contact direction and a separation direction, the contact direction being a direction in which the movable contact piece comes into contact with the first fixed terminal, and the separation direction being a direction in which the movable contact piece moves away from the first fixed terminal; Equipped with the first fixed terminal further includes a third layer member; the third layer member is separate from the first main member and the first layer member, protrudes from inside the housing to outside the housing, and has a shape branched from the first main member. Electromagnetic relay.

11. the third layer member is laminated on the first layer member; 11. The electromagnetic relay according to claim 10.

12. the third layer member is laminated on the first main member on the opposite side to the first layer member; 11. The electromagnetic relay according to claim 10.

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