Electromagnetic relay
By adopting a split fixed terminal structure in the electromagnetic relay and utilizing the current shunting design of the main component and the layer component, the problems of poor heat dissipation and large thermal impact under high current are solved, thus realizing the compactness and efficient heat dissipation of the electromagnetic relay.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- OMRON CORP
- Filing Date
- 2022-09-23
- Publication Date
- 2026-07-21
AI Technical Summary
Existing electromagnetic relays generate a lot of heat at their fixed terminals under high current, resulting in poor heat dissipation and potential thermal impact on the substrate. At the same time, the problem of scaling up is difficult to solve.
It adopts a split fixed terminal structure, including a main component and a layer component. The layer component branches from the main component and is stacked with it to increase the surface area and shunt the current. It is connected through a substrate to improve heat dissipation.
It effectively curbs the increase in the size of electromagnetic relays, improves the heat dissipation of fixed terminals, and reduces the thermal impact on the substrate.
Smart Images
Figure CN115995361B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an electromagnetic relay. Background Technology
[0002] An electromagnetic relay includes a fixed terminal, a movable contact, and a housing. The fixed terminal protrudes from inside the housing to the outside. The movable contact is designed to move in both a contact direction and a departure direction. The contact direction is the direction in which the movable contact contacts the fixed terminal. The departure direction is the direction in which the movable contact moves away from the fixed terminal. Current flows to the fixed terminal through the contact between the movable contact and the fixed terminal.
[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-057225 Summary of the Invention
[0004] When a large current flows through an electromagnetic relay, the heat generated by the fixed terminal increases. Therefore, it is desirable to improve heat dissipation by increasing the surface area of the fixed terminal. However, if the fixed terminal becomes larger in order to increase its surface area, the electromagnetic relay becomes larger. In addition, if the heat generated by the fixed terminal increases, the thermal impact on the substrate from the fixed terminal also increases. The object of the present invention is to suppress the increase in the size of the electromagnetic relay, improve the heat dissipation of the fixed terminal, and reduce the thermal impact on the substrate from the fixed terminal.
[0005] An electromagnetic relay according to one aspect of the present invention includes a housing, a first fixed terminal, a movable contact, and a driving device. The first fixed terminal includes a first main component and a first layer component. The first main component protrudes from inside the housing to outside the housing. The first layer component is separate from the first main component. The first layer component is stacked on the first main component. The first layer component protrudes from inside the housing to outside the housing. The first layer component has a shape branching from the first main component. The movable contact is disposed within the housing and faces the first fixed terminal. The driving device moves the movable contact in a contact direction and a departure direction. The contact direction is the direction in which the movable contact contacts the first fixed terminal. The departure direction is the direction in which the movable contact leaves the first fixed terminal.
[0006] In this electromagnetic relay, the first fixed terminal includes a first main component and a first layer component that are separate from each other, with the first layer component branching off from the first main component. Therefore, the size of the first fixed terminal is suppressed, and the surface area of the first fixed terminal is increased. This, in turn, suppresses the size of the electromagnetic relay and improves the heat dissipation of the first fixed terminal. Furthermore, the current flowing through the first fixed terminal is shunt to the first main component and the first layer component. Therefore, when the electromagnetic relay is mounted on a substrate, heat from the first fixed terminal is dispersed to the first main component and the first layer component, and then transferred to the substrate. This reduces the thermal impact on the substrate from the first fixed terminal.
[0007] The first layer component may also include a connecting portion and a terminal portion. The connecting portion may also be disposed within the housing on the first main component. At least a portion of the terminal portion may also be disposed outside the housing. The terminal portion may also be disposed spaced apart from the first main component. In this case, the terminal portion is disposed spaced apart from the first main component, thereby increasing the surface area of the first fixed terminal. This improves the heat dissipation of the first fixed terminal.
[0008] The first layer component may also include a stepped portion disposed between the connecting portion and the terminal portion. The first layer component may also be bent between the connecting portion and the stepped portion, and between the stepped portion and the terminal portion. In this case, the terminal portion is disposed at a distance from the first main component via the stepped portion. This improves the heat dissipation of the first fixed terminal.
[0009] The housing may also include a base supporting the first fixed terminal. The first fixed terminal may also protrude from the bottom of the base outwards from the housing. The lower end of the first main component may also be located below the bottom surface of the base. The lower end of the first layer component may also be located below the bottom surface of the base. In this case, the first main component and the first layer component can be easily connected to the substrate.
[0010] The base may also include legs projecting downwards from the bottom surface. The lower end of the first main component may also be located below the lower end of the legs. The lower end of the first layer component may also be located below the lower end of the legs. In this case, the first main component and the first layer component can be easily connected to the substrate. Furthermore, space is ensured between the bottom surface of the base and the substrate by making the legs contact the substrate. Therefore, a portion of the first main component and a portion of the first layer component are disposed in the space between the bottom surface of the base and the substrate. This improves the heat dissipation of the first fixing terminal.
[0011] The first main component and the first layer component can also have a plate-like shape. The thickness of the first layer component can also be different from that of the first main component. In this case, the temperature rise values of the first layer component and the first main component can be arbitrarily changed according to the ratio of the thickness of the first layer component to the thickness of the first main component.
[0012] The electromagnetic relay may also include a second fixed terminal. The second fixed terminal may also include a second main component and a second layer component. The second main component may protrude from inside the housing to outside the housing. The second layer component may be separate from the second main component. The second layer component may also be stacked on the second main component. The second layer component may also protrude from inside the housing to outside the housing. The second layer component may also have a shape branching from the second main component. In this case, the size of the second fixed terminal is suppressed, and the surface area of the second fixed terminal is increased. This suppresses the size of the electromagnetic relay and improves the heat dissipation of the second fixed terminal. Furthermore, the thermal impact on the substrate from the second fixed terminal is reduced.
[0013] The first layer component and the second layer component can also be configured on the same side relative to the first main component and the second main component. In this case, the first layer component and the second layer component are configured compactly.
[0014] The first layer component and the second layer component can also be configured on opposite sides of each other relative to the first main component and the second main component. In this case, the heat dissipation of the first layer component and the second layer component is improved.
[0015] The first fixing terminal may also include a third layer component. The third layer component may be separate from the first main component and the first layer component. The third layer component may also protrude from inside the housing to outside the housing. The third layer component may also have a shape branching from the first main component. In this case, the heat dissipation of the first fixing terminal is further improved. Furthermore, the thermal impact on the substrate from the first fixing terminal can be further reduced.
[0016] The third layer component can also be stacked on top of the first layer component. In this case, the first layer component and the third layer component are stacked on the same side relative to the first main component. Thus, the first layer component and the third layer component are configured compactly.
[0017] The third layer component can also be stacked on the first main component on the side opposite to the first layer component. In this case, the first layer component and the third layer component are stacked on opposite sides of the first main component. This improves the heat dissipation of both the first layer component and the third layer component.
[0018] According to the present invention, the increasing size of electromagnetic relays can be suppressed, and the heat dissipation of the fixed terminals can be improved. In addition, the thermal impact on the substrate from the fixed terminals is reduced. Attached Figure Description
[0019] Figure 1 This is a perspective view of the electromagnetic relay according to the first embodiment.
[0020] Figure 2 This is a 3D view of the interior of an electromagnetic relay.
[0021] Figure 3 This is a top view of the electromagnetic relay when the moving part is in the disconnected position.
[0022] Figure 4 This is a top view of the electromagnetic relay when the moving part is in the closed position.
[0023] Figure 5 This is a side view of the inside of an electromagnetic relay.
[0024] Figure 6 This is a three-dimensional view of the first fixed terminal.
[0025] Figure 7 This is an enlarged side view of the lower part of the electromagnetic relay.
[0026] Figure 8 This is a three-dimensional view of the electromagnetic relay as seen from below.
[0027] Figure 9 This is a side view showing the lower part of the electromagnetic relay of the first modified example.
[0028] Figure 10 This is a side view showing the lower part of the electromagnetic relay of the second modified example.
[0029] Figure 11 This is a side view showing the lower part of the electromagnetic relay of the third modified example.
[0030] Figure 12 This is a perspective view of an electromagnetic relay according to another embodiment, as seen from below.
[0031] Symbol Explanation
[0032] 3…Housing; 4…Driver; 11…Base; 13…First fixed terminal; 14…Second fixed terminal; 15…First movable contact piece; 51…First main component; 52…First layer component; 53…Connecting part; 54…Step part; 55…Terminal part; 56…Third layer component; 43-46…Legs; 61…Second main component; 62…Second layer component. Detailed Implementation
[0033] Hereinafter, the electromagnetic relay 1 according to the embodiment will be described with reference to the accompanying drawings. Figure 1 This is a perspective view of the electromagnetic relay 1 according to the first embodiment. Figure 2 This is a 3D view of the interior of electromagnetic relay 1. Figure 3 and Figure 4 This is a top view of the interior of electromagnetic relay 1.
[0034] 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 casing 12. Figures 2 to 4 The outer casing 12 is omitted. The base 11 supports the contact device 2 and the drive device 4.
[0035] In the following description, the direction from the base 11 toward the contact device 2 and the drive device 4 is defined as upward, and the opposite direction is defined as downward. The direction from the drive device 4 toward the contact device 2 is defined as forward, and the opposite direction is defined as backward. The direction perpendicular to the up / down and front / back directions is defined as left / right.
[0036] The 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 part 17. The first fixed terminal 13 and the second fixed terminal 14 are formed of a conductive material such as copper. The first fixed terminal 13 and the second fixed terminal 14 extend in the vertical direction, respectively.
[0037] The first fixed terminal 13 and the second fixed terminal 14 are arranged separately from each other in the left-right direction. The first fixed terminal 13 and the second fixed terminal 14 are fixed to the base 11. The first fixed terminal 13 and the second fixed terminal 14 protrude from inside the housing 3 to outside the housing 3. The first fixed terminal 13 and the second fixed terminal 14 protrude downward from the base 11.
[0038] A first fixed contact 21 and a third fixed contact 23 are connected to the first fixed terminal 13. A second fixed contact 22 and a fourth fixed contact 24 are connected to the second fixed terminal 14. The first contact 21 to the fourth fixed contact 24 are formed of a conductive material such as silver or copper.
[0039] The first movable contact 15 and the second movable contact 16 extend in a left-right direction. The first movable contact 15 and the second movable contact 16 are separate from each other. The first movable contact 15 and the second movable contact 16 are formed of a conductive material such as copper.
[0040] The first movable contact 15 is disposed opposite to 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 15. The first movable contact 25 is disposed opposite to the first fixed contact 21. The second movable contact 26 is disposed opposite to the second fixed contact 22.
[0041] The second movable contact 16 is disposed opposite to 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 16. The third movable contact 27 is disposed opposite to the third fixed contact 23. The fourth movable contact 28 is disposed opposite to the fourth fixed contact 24. The first movable contact 25 to the fourth movable contact 28 are formed of a conductive material such as silver or copper.
[0042] The movable component 17 holds the first movable contact piece 15 and the second movable contact piece 16. The movable component 17 is made of an electrically insulating resin. The movable component 17 is capable of moving in the back-and-forth direction. The movable component 17 is capable of moving to a closed position and an open position. Figure 3 In the middle, the moving part 17 is in the open position. When the moving part 17 is in the open position, the movable contacts 25 to 28 are separated from the fixed contacts 21 to 24, respectively. Figure 4In the closed position, the movable component 17 is in contact with the fixed contacts 21 to 24. When the movable component 17 is in the closed position, the movable contacts 25 to 28 are in contact with the fixed contacts 21 to 24, respectively.
[0043] 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 departure direction. The contact direction is the direction in which the movable contacts 25-28 contact the fixed contacts 21-24. The departure direction is the direction in which the movable contacts 25-28 leave the fixed contacts 21-24. In this embodiment, the contact direction is rearward, and the departure direction is forward.
[0044] The drive unit 4 includes a coil 31, a spool 32, a movable iron core 33, a fixed iron core 34, and a magnetic 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 configured to move in a forward-backward direction. The fixed iron core 34 is disposed within the spool 32. The fixed iron core 34 is positioned opposite the movable iron core 33. The coil 31 generates an electromagnetic force that moves the movable iron core 33 when energized.
[0045] The movable iron core 33 is connected to the moving member 17. The movable iron core 33 moves in the contact direction according to the magnetic force generated from the coil 31. As the movable iron core 33 moves, the moving member 17 moves to the closed position. The magnetic yoke 35 is configured to surround the coil 31. The magnetic yoke 35 is arranged on the magnetic circuit formed by the coil 31.
[0046] The electromagnetic relay 1 includes a first reset spring 36 and a second reset spring 37. The first reset spring 36 and the second reset spring 37 are disposed between the moving part 17 and the drive device 4. The first reset spring 36 and the second reset spring 37 exert a force on the moving part 17 in the moving direction.
[0047] Next, the operation of the electromagnetic relay 1 will be explained. When the coil 31 is not energized, the drive device 4 is not energized. In this case, the moving part 17, together with the movable iron core 33, is pressed away by the spring force of the return springs 36 and 37, thereby the moving part 17 is located in the position... Figure 3 The disconnection point is shown.
[0048] In this state, the first movable contact 15 and the second movable contact 16 are also pressed in the disengaging direction via the moving member 17. Therefore, when the moving member 17 is in the open position, the first movable contact 25 and the second movable contact 26 disengage 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 movable contact 27 and the fourth movable contact 28 disengage from the third fixed contact 23 and the fourth fixed contact 24.
[0049] If coil 31 is energized, drive device 4 is energized. In this case, the movable iron core 33 moves in the contact direction by overcoming the spring force of return springs 36 and 37 through the electromagnetic force of coil 31. As a result, moving part 17, first movable contact piece 15, and second movable contact piece 16 move together in the contact direction. Therefore, as... Figure 4 As shown, the moving part 17 moves to the closed position.
[0050] As a result, when the moving part 17 is in the closed position, the first movable contact 25 and the second movable contact 26 contact the first fixed contact 21 and the second fixed contact 22, respectively. Similarly, when the moving part 17 is in the closed position, the third movable contact 27 and the fourth movable contact 28 contact the third fixed contact 23 and the fourth fixed contact 24, respectively. Thus, 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.
[0051] If the current flowing into coil 31 is stopped and demagnetization is achieved, the movable iron core 33 is pressed away by the spring force of the return springs 36 and 37. Consequently, the moving part 17, the first movable contact piece 15, and the second movable contact piece 16 move together in the away direction. Therefore, as... Figure 3 As shown, the moving part 17 moves to the disconnected position.
[0052] As a result, when the moving part 17 is in the disconnected position, the first movable contact 25 and the second movable contact 26 separate from the first fixed contact 21 and the second fixed contact 22. Similarly, when the moving part 17 is in the disconnected position, the third movable contact 27 and the fourth movable contact 28 separate from the third fixed contact 23 and the fourth fixed contact 24.
[0053] When a large current flows through the electromagnetic relay 1, the first fixed terminal 13, the second fixed terminal 14, the first movable contact 15, and the second movable contact 16 become hot. For example... Figure 1 As shown, in the electromagnetic relay 1 of this embodiment, the first fixed terminal 13 and the second fixed terminal 14 have a branched shape in order to improve the heat dissipation of the electromagnetic relay 1. The structure of the first fixed terminal 13 and the second fixed terminal 14 will be described in detail below.
[0054] Figure 5 This is a side view of the interior of electromagnetic relay 1. (As shown) Figure 5As shown, the first fixed terminal 13 includes a first main component 51 and a first layer component 52. The first main component 51 and the first layer component 52 have a plate-like shape. The first main component 51 and the first layer component 52 protrude from inside the housing 3 to outside the housing 3. The first main component 51 and the first layer component 52 are supported by a base 11. The first main component 51 and the first layer component 52 protrude from above the base 11, through the base 11, and below the bottom surface 47 of the base 11.
[0055] like Figure 1 and Figure 5 As shown, the base 11 includes a plurality of legs 43-46. The plurality of legs 43-46 project downwards from the bottom surface 47 of the base 11. Figure 5 As shown, multiple legs 43-46 are in contact with the base plate 100 on which the electromagnetic relay 1 is mounted.
[0056] Figure 6 This is a perspective view of the first fixed terminal 13. Figure 7 This is a magnified side view of the lower part of electromagnetic relay 1. (As shown...) Figure 6 and Figure 7 As shown, the first main component 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.
[0057] The first layer component 52 is separate from the first main component 51. The first layer component 52 is stacked on the first main component 51. The first layer component 52 is disposed opposite to the first surface 131 of the first main component 51. The first layer component 52 is connected to the first surface 131. The first layer component 52 is connected to the first main component 51, for example, by welding or riveting. The first layer component 52 has a plate-like shape that is thinner than the first main component 51.
[0058] like Figure 7 As shown, the thickness T2 of the first layer component 52 is smaller than the thickness T1 of the first main component 51. The area of the horizontal cross-section of the first layer component 52 is smaller than the area of the horizontal cross-section of the first main component 51. The upper part of the first layer component 52 is positioned opposite the movable contact pieces 15 and 16 within the housing 3. A first fixed contact 21 and a third fixed contact 23 are mounted on the upper part of the first layer component 52. The lower part of the first layer component 52 has a curved shape that branches off from the first main component 51.
[0059] In detail, the first layer component 52 includes a connecting portion 53, a stepped portion 54, and a terminal portion 55. The first layer component 52 is bent between the connecting portion 53 and the stepped portion 54. The first layer component 52 is bent between the stepped 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 component 51. The connecting portion 53 is disposed on the first main component 51 within the housing 3.
[0060] A stepped portion 54 is disposed between the connecting portion 53 and the terminal portion 55. The stepped portion 54 extends from the connecting portion 53 in the front-rear direction. The terminal portion 55 extends downward from the stepped portion 54. The terminal portion 55 is connected to the substrate 100. The stepped portion 54 and the terminal portion 55 are disposed outside the housing 3. The stepped 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 component 51 in the front-rear direction.
[0061] like Figure 7 As shown, the lower end 511 of the first main component 51 is located below the bottom surface 47 of the base 11. The lower end 521 of the first layer component 52 is located below the bottom surface 47 of the base 11. The lower end 511 of the first main component 51 is located below the lower ends 431 and 441 of the legs 43 and 44. The lower end 521 of the first layer component 52 is located below the lower ends 431 and 441 of the legs 43 and 44. The first layer component 52 and the first main component 51 are electrically connected to the substrate 100.
[0062] Figure 8 This is a perspective view of electromagnetic relay 1 as seen from below. Figure 1 and Figure 8 As shown, the second fixing terminal 14 has the same shape as the first fixing terminal 13. The second fixing terminal 14 includes a second main component 61 and a second layer component 62. The second main component 61 and the second layer component 62 have a plate-like shape. The second main component 61 and the second layer component 62 protrude from inside the housing 3 to outside the housing 3. The second main component 61 and the second layer component 62 are supported by the base 11. The second main component 61 and the second layer component 62 protrude from above the base 11, through the base 11, and below the bottom surface 47 of the base 11.
[0063] The second layer component 62 is separate from the second main component 61. The second layer component 62 is stacked on the second main component 61. The second layer component 62 is connected to the second main component 61, for example, by welding or riveting. The second layer component 62 has a plate-like shape that is thinner than the second main component 61. The horizontal cross-sectional area of the second layer component 62 is smaller than that of the second main component 61. The upper part of the second layer component 62 is opposite to the movable contact pieces 15 and 16 within the housing 3. The second fixed contact 22 and the fourth fixed contact 24 are mounted on the upper part of the second layer component 62. The lower part of the second layer component 62 has a curved shape that branches off from the second main component 61.
[0064] The first layer component 52 and the second layer component 62 are arranged in the same direction relative to the first main component 51 and the second main component 61. That is, the first layer component 52 is arranged in front of the first main component 51, and the second layer component 62 is arranged in front of the second main component 61. Alternatively, the first layer component 52 may also be arranged behind the first main component 51, and the second layer component 62 may also be arranged behind the second main component 61.
[0065] In the electromagnetic relay 1 of this embodiment described above, the first fixed terminal 13 includes a first main component 51 and a first layer component 52 that are separate from each other, with the first layer component 52 branching off from the first main component 51. Therefore, the enlargement of the first fixed terminal 13 is suppressed, and the surface area of the first fixed terminal 13 is increased. This, in turn, suppresses the enlargement of the electromagnetic relay 1 and improves the heat dissipation of the first fixed terminal 13.
[0066] The current flowing through the first fixed terminal 13 is shunted to the first main component 51 and the first layer component 52. Therefore, when the electromagnetic relay 1 is mounted on the substrate 100, the heat from the first fixed terminal 13 is dispersed to the first main component 51 and the first layer component 52, and then transferred to the substrate 100. This reduces the thermal impact on the substrate 100 from the first fixed terminal 13. Furthermore, since the thickness of the first main component 51 and the first layer component 52 is reduced, the processing accuracy of the first main component 51 and the first layer component 52 is improved. For example, bending the first layer component 52 becomes easier.
[0067] The second fixed terminal 14 includes a second main component 61 and a second layer component 62. The second main component 61 and the second layer component 62 have the same structure as the first main component 51 and the first layer component 52, respectively. Therefore, the second fixed terminal 14 can also achieve the same effect as the first fixed terminal 13.
[0068] The above describes one embodiment of the present invention, but the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.
[0069] The construction of the contact device 2 and the drive device 4 is not limited to the above embodiment and can be modified. For example, in the above embodiment, the electromagnetic relay 1 is a so-called plunger-type electromagnetic relay, but other types of electromagnetic relays, such as hinge-type relays, may also be provided with a fixed terminal having the same construction as the first fixed terminal 13 described above.
[0070] The shape or configuration of the first fixed terminal 13, the second fixed terminal 14, the first movable contact piece 15, and the second movable contact piece 16 can also be changed. For example, the first movable contact piece 15 and the second movable contact piece 16 can also be formed as one piece. That is, the first movable contact 25 to the fourth movable contact 28 can also be connected to the one-piece movable contact piece. Alternatively, the second movable contact piece 16, the third movable contact 27, the fourth movable contact 28, and the third fixed contact 23 and the fourth fixed contact 24 can also be omitted.
[0071] The first fixed contact 21 and the third fixed contact 23 can also be integrated with the first fixed terminal 13. Alternatively, the first fixed contact 21 and the third fixed contact 23 can be omitted. The second fixed contact 22 and the fourth fixed contact 24 can also be integrated with the second fixed terminal 14. Alternatively, the second fixed contact 22 and the fourth fixed contact 24 can be omitted.
[0072] The first movable contact 25 and the second movable contact 26 can also be integrated with the first movable contact piece 15. Alternatively, the first movable contact 25 and the second movable contact 26 can be omitted. The third movable contact 27 and the fourth movable contact 28 can also be integrated with the second movable contact piece 16. Alternatively, the third movable contact 27 and the fourth movable contact 28 can be omitted.
[0073] In the above embodiment, the terminal portion 55 of the first layer component 52 is entirely located outside the housing 3. However, a portion of the terminal portion 55 of the first layer component 52 may also be located inside the housing 3. That is, the first layer component 52 may be bent outside the housing 3 or it may be bent inside the housing 3.
[0074] In the above embodiment, the thickness T2 of the first layer component 52 is smaller than the thickness T1 of the first main component 51. However, it is also possible to... Figure 9 As shown in the first variation, the thickness T2 of the first layer component 52 is the same as the thickness T1 of the first main component 51. Alternatively, the thickness T2 of the first layer component 52 may be greater than the thickness T1 of the first main component 51. As with the first fixed terminal 13 in the first variation, the temperature rise of the first layer component 52 and the first main component 51 can be arbitrarily adjusted by adjusting the thickness T2 of the first layer component 52 and the thickness T1 of the first main component 51. Furthermore, although not shown in the figure, the second fixed terminal 14 may also have the same structure as the first fixed terminal 13 in the first variation.
[0075] Figure 10 This is a side view showing the first fixed terminal 13 in the second modified example. (See attached image.) Figure 10 As shown, the first fixed terminal 13 may also include a third layer component 56. The third layer component 56 is separate from the first main component 51 and the first layer component 52, protruding from inside the housing 3 to outside the housing 3, and has a branch shape from the first main component 51. The third layer component 56 has the same curved shape as the first layer component 52. The third layer component 56 is stacked on top of the first layer component 52. The first layer component 52 is disposed between the first main component 51 and the third layer component 56.
[0076] In the first fixed terminal 13 of the second modification, the surface area of the first fixed terminal 13 is further increased by the third layer component 56. This further improves the heat dissipation of the first fixed terminal 13. Furthermore, although not shown in the figure, the second fixed terminal 14 may also have the same structure as the first fixed terminal 13 of the second modification.
[0077] Figure 11 This is a side view showing the first fixed terminal 13 in the third modified example. It can also be as follows: Figure 11 As shown, the third layer component 56 is stacked on the first main component 51 on the side opposite to the first layer component 52. The third layer component 56 is disposed opposite to the second surface 132 of the first main component 51. The third layer component 56 is connected to the second surface 132.
[0078] The first main component 51 is disposed between the first layer component 52 and the third layer component 56. The third layer component 56 has a shape that is curved symmetrically with respect to the first main component 51 and the first layer component 52. In the first fixed terminal 13 of the third variation, heat dissipation is further improved by means of the third layer component 56. Furthermore, although not shown in the figure, the second fixed terminal 14 may also have the same structure as the first fixed terminal 13 of the third variation.
[0079] In the first embodiment described above, the first layer component 52 and the second layer component 62 are disposed on the same side relative to the first main component 51 and the second main component 61. However, the first layer component 52 and the second layer component 62 may also be disposed on opposite sides relative to the first main component 51 and the second main component 61. For example, they may be disposed as follows: Figure 12 As shown, the first layer component 52 is positioned behind the first main component 51, and the second layer component 62 is positioned in front of the second main component 61. Alternatively, the first layer component 52 may be positioned in front of the first main component 51, and the second layer component 62 may be positioned behind the second main component 61.
[0080] Industrial availability
[0081] According to the present invention, the increasing size of electromagnetic relays can be suppressed, and the heat dissipation of the fixed terminals can be improved. Furthermore, the thermal impact on the substrate from the fixed terminals is reduced.
Claims
1. An electromagnetic relay, characterized in that, have: case; The first fixed terminal includes a first main component and a first layer component, wherein the first main component protrudes from inside the housing to outside the housing, and the first layer component is separate from the first main component, stacked on the first main component, protrudes from inside the housing to outside the housing, and has a shape branching from the first main component; A movable contact piece is disposed within the housing and is positioned opposite the first fixed terminal; A driving device that moves the movable contact piece in a contact direction and a departure direction, wherein the contact direction is the direction in which the movable contact piece contacts the first fixed terminal, and the departure direction is the direction in which the movable contact piece leaves the first fixed terminal; The first layer component includes: A connecting portion, which is disposed within the housing on the first main component; and A terminal portion, at least a portion of which is disposed outside the housing and spaced apart from the first main component; The housing includes a base that supports the first fixed terminal. The first fixing terminal protrudes from the bottom of the base outward from the housing. The base includes legs that project downwards from the bottom surface. The lower end of the first main component is located below the lower end of the leg. The lower end of the first layer component is located below the lower end of the leg.
2. The electromagnetic relay according to claim 1, characterized in that, The first layer component also includes a stepped portion disposed between the connecting portion and the terminal portion. The first layer component is bent between the connecting portion and the stepped portion, and between the stepped portion and the terminal portion.
3. The electromagnetic relay according to claim 1 or 2, characterized in that, The lower end of the first main component is located below the bottom surface of the base. The lower end of the first layer component is located below the bottom surface of the base.
4. The electromagnetic relay according to claim 1, characterized in that, The first main component and the first layer component have a plate-like shape. The thickness of the first layer component is different from the thickness of the first main component.
5. The electromagnetic relay according to claim 1, characterized in that, It also has a second fixing terminal, which includes a second main component and a second layer component, wherein the second main component protrudes from inside the housing to outside the housing, and the second layer component is separate from the second main component, stacked on the second main component, protruding from inside the housing to outside the housing, and has a shape that branches from the second main component.
6. The electromagnetic relay according to claim 5, characterized in that, The first layer component and the second layer component are configured on the same side relative to the first main component and the second main component.
7. The electromagnetic relay according to claim 5, characterized in that, The first layer component and the second layer component are configured on opposite sides of each other relative to the first main component and the second main component.
8. The electromagnetic relay according to claim 1, characterized in that, The first fixed terminal also includes a third layer component. The third layer component is separate from the first main component and the first layer component, protrudes from inside the housing to outside the housing, and has a shape that branches off from the first main component.
9. The electromagnetic relay according to claim 8, characterized in that, The third layer component is stacked on top of the first layer component.
10. The electromagnetic relay according to claim 8, characterized in that, The third layer component is stacked on the first main component on the side opposite to the first layer component.