Electromagnetic relay

Abstract

An electromagnetic relay, the object of the present invention is to suppress the reduction of the contact force of the contact in the electromagnetic relay and improve the assemblability. The first fixed terminal includes a first supporting portion and a first extending portion. The first supporting portion is located in the closing direction of the movable contact piece. The first supporting portion supports the first fixed contact. The first supporting portion extends from the first fixed contact toward the first side. The first side is a direction in the length direction of the movable contact piece. The first extending portion is connected to the first supporting portion. The first extending portion extends from the first supporting portion in the closing direction. The first extending portion is configured separately from the movable contact piece to the first side.

Description

Technical Field

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

[0002] Among electromagnetic relays, there is an electromagnetic relay including a movable contact piece, a first fixed terminal, and a second fixed terminal (for example, see patent documents 1 and 2). The movable contact piece is connected to a first movable contact and a second movable contact. The first fixed terminal is connected to a first fixed contact. The second fixed terminal is connected to a second fixed contact.

[0003] Patent Document 1: Japanese Patent No. 6358442

[0004] Patent Document 2: Japanese Patent Application Laid-Open No. 2015-46373

[0005] Fig.12 1 is a diagram showing an example of an electromagnetic relay including a movable contact piece 101, a first fixed terminal 102, and a second fixed terminal 103. Fig.12 In the electromagnetic relay shown, the movable contact piece 101 is arranged below the first fixed terminal 102 and the second fixed terminal 103. The first fixed terminal 102 and the second fixed terminal 103 extend upward from a position opposite to the movable contact piece 101. In this electromagnetic relay, when current flows from the first fixed terminal 102 to the second fixed terminal 103 through the movable contact piece 101, a magnetic field is generated above and below the movable contact piece 101. In this case, the magnetic flux density B1 above the movable contact piece 101 is greater than the magnetic flux density B2 below the movable contact piece 101. Therefore, the Lorentz force acts on the disconnection direction ( Fig.12 As a result, the contact force of the contacts becomes weaker.

[0006] Fig.13 2 is a diagram showing another example of an electromagnetic relay including a movable contact piece 201, a first fixed terminal 202, and a second fixed terminal 203. Fig.13 In the electromagnetic relay shown in FIG. 1 , the movable contact piece 201 is disposed between the first fixed terminal 202 and the second fixed terminal 203. Therefore, even if the magnetic flux density B1 above the movable contact piece 201 is greater than the magnetic flux density B2 below the movable contact piece 201, the Lorentz force acts on the closing direction ( Fig.13 Therefore, it is possible to prevent the contact force of the contact point from being weakened. Fig.13 In the electromagnetic relay shown, the movable contact piece 201 easily interferes with the first fixed terminal 202 and the second fixed terminal 203 when the electromagnetic relay is assembled, so the assemblability is deteriorated. Summary of the invention

[0007] An object of the present disclosure is to improve assemblability while suppressing a decrease in contact force of contacts in an electromagnetic relay.

[0008] An electromagnetic relay of one embodiment of the present disclosure comprises a movable contact piece, a first movable contact, a second movable contact, a first fixed contact, a second fixed contact, a first fixed terminal, and a second fixed terminal. The movable contact piece can move in a closing direction and an opening direction opposite to the closing direction. The first movable contact is connected to the movable contact piece. The second movable contact is connected to the movable contact piece. The first fixed contact is arranged relative to the first movable contact in the closing direction. The second fixed contact is arranged relative to the second movable contact in the closing direction. The first fixed terminal is connected to the first fixed contact. The second fixed terminal is connected to the second fixed contact.

[0009] The first fixed terminal includes a first supporting portion and a first extending portion. The first supporting portion is located in the closing direction of the movable contact piece. The first supporting portion supports the first fixed contact. The first supporting portion extends from the first fixed contact toward the first side. The first side is a direction in the length direction of the movable contact piece. The first extending portion is connected to the first supporting portion. The first extending portion extends from the first supporting portion in the closing direction. The first extending portion is separately configured from the movable contact piece to the first side. The second fixed terminal includes a second supporting portion and a second extending portion. The second supporting portion is located in the closing direction of the movable contact piece. The second supporting portion supports the second fixed contact. The second supporting portion extends from the second fixed contact toward the second side. The second side is a direction in the length direction of the movable contact piece. The second extending portion is connected to the second supporting portion. The second extending portion extends from the second supporting portion in the closing direction. The second extending portion is separately configured from the movable contact piece to the second side.

[0010] In the electromagnetic relay of this mode, the first extension portion of the first fixed terminal is configured to be separated from the movable contact piece to the first side. The second extension portion of the second fixed terminal is configured to be separated from the movable contact piece to the second side. Therefore, the distance between the first extension portion and the second extension portion becomes larger. Thus, by reducing the Lorentz force acting on the movable contact piece in the disconnection direction, the reduction in the contact force of the contact can be suppressed. In addition, the first supporting portion, the first extension portion, the second supporting portion, and the second extension portion are located in the closing direction relative to the movable contact piece. Therefore, when assembling the electromagnetic relay, the movable contact piece is not easy to interfere with the first fixed terminal and the second fixed terminal. Thus, the assemblability is improved.

[0011] The electromagnetic relay may also include a housing. The housing may also accommodate a movable contact piece, a first movable contact, a second movable contact, a first fixed contact, and a second fixed contact. The first fixed terminal may also include a first connecting portion and a first external terminal. The first connecting portion may also be connected to the first extension portion and extend from the first extension portion toward the second side. The first external terminal may also be connected to the first connecting portion and protrude to the outside of the housing. The second fixed terminal may also include a second connecting portion and a second external terminal. The second connecting portion may also be connected to the second extension portion and extend from the second extension portion toward the first side. The second external terminal may also be connected to the second connecting portion and protrude to the outside of the housing.

[0012] The first connection portion may also extend from the first extension portion toward the first side. The second connection portion may also extend from the second extension portion toward the second side. The first connection portion may also protrude from the shell toward the outside of the shell. The second connection portion may also protrude from the shell toward the outside of the shell.

[0013] The electromagnetic relay may also include a first magnet and a second magnet. The first magnet may also be configured in a manner to offset the direction of the magnetic flux generated when power is supplied to the first movable contact and the first fixed contact. The second magnet may also be configured in a manner to offset the direction of the magnetic flux generated when power is supplied to the second movable contact and the second fixed contact. The electromagnetic relay may also include a first magnetic shielding component and a second magnetic shielding component. The first magnetic shielding component may also be configured between the first extension portion and the movable contact piece in the length direction of the movable contact piece. The second magnetic shielding component may also be configured between the second extension portion and the movable contact piece in the length direction of the movable contact piece.

[0014] In the length direction of the movable contact piece, the distance between the first extension portion and the second extension portion may also be greater than the length of the movable contact piece. When viewed from the closing direction or the opening direction, the first extension portion may also be arranged at a position that does not overlap with the movable contact piece. When viewed from the closing direction or the opening direction, the second extension portion may also be arranged at a position that does not overlap with the movable contact piece.

[0015] The electromagnetic relay may also include a drive shaft and a drive device. The drive shaft may also be connected to the movable contact piece. The drive shaft may also extend from the movable contact piece in the disconnection direction. The drive device may also be configured in the disconnection direction relative to the movable contact piece. The drive device may also include a movable iron core and a coil. The movable iron core may also be connected to the drive shaft. The movable iron core may also be able to move in the closing direction and the disconnecting direction. The coil may also generate an electromagnetic force that moves the movable iron core.

[0016] According to the present invention, in the electromagnetic relay, it is possible to suppress a decrease in the contact force of the contacts and to improve assemblability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side cross-sectional view showing the electromagnetic relay in the OFF state according to the first embodiment.

[0018] Figure 2 It is a side cross-sectional view showing the electromagnetic relay in a closed state.

[0019] Figure 3 yes Figure 1 Section view III-III.

[0020] Figure 4 It is a side cross-sectional view showing an electromagnetic relay according to a second embodiment.

[0021] Figure 5 It is a side cross-sectional view showing an electromagnetic relay according to a third embodiment.

[0022] Figure 6 It is a side cross-sectional view showing an electromagnetic relay according to a fourth embodiment.

[0023] Figure 7 It is a side cross-sectional view showing an electromagnetic relay according to a fifth embodiment.

[0024] Figure 8 It is a side cross-sectional view of an electromagnetic relay showing a first modified example of arrangement of magnets.

[0025] Fig. 9 It is a side cross-sectional view of an electromagnetic relay showing a second modified example of arrangement of magnets.

[0026] Fig.10 The electromagnetic relay of the third modification example showing the arrangement of the magnets Figure 1 Sectional view III-III in the figure.

[0027] Fig.11 It is a side cross-sectional view showing an electromagnetic relay according to another embodiment.

[0028] Fig.12 It is a partial side sectional view showing an electromagnetic relay involved in a comparative example.

[0029] Fig.13 It is a partial side sectional view showing an electromagnetic relay of another comparative example.

[0030] Description of reference numerals:

[0031] 10: movable mechanism; 11: first fixed terminal; 13: movable contact piece 14: first fixed contact; 16: first movable contact; 19: driving shaft; 31: movable iron core; 32: coil; 41: first supporting part; 42: first extension part; 43: first connecting part; 44: first external terminal; 45: second supporting part; 46: second extension part; 47: second connecting part; 48: second external terminal; 51: first magnetic shielding component; 52: second magnetic shielding component. DETAILED DESCRIPTION

[0032] Hereinafter, an electromagnetic relay 1 a according to an embodiment will be described with reference to the drawings. Figure 1 1 is a side cross-sectional view showing the electromagnetic relay 1a of the first embodiment. Figure 1 As shown, the electromagnetic relay 1 a includes a contact device 2 , a housing 3 , and a drive device 4 .

[0033] In the following description, the directions of up, down, left, and right refer to Figure 1 In detail, the direction from the drive device 4 toward the contact device 2 is defined as the upper direction. The direction from the contact device 2 toward the drive device 4 is defined as the lower direction. Figure 1 In the , the direction perpendicular to the up-down direction is defined as the left-right direction. The direction perpendicular to the up-down direction and the left-right direction is defined as the front-back direction. Figure 1 However, these directions are defined for convenience of explanation and do not limit the arrangement direction of the electromagnetic relay 1a.

[0034] The contact device 2 is arranged in the housing 3. The contact device 2 includes a movable mechanism 10, a first fixed terminal 11, a second fixed terminal 12, a movable contact piece 13, a first fixed contact 14, a second fixed contact 15, a first movable contact 16, and a second movable contact 17. The first fixed contact 14 is connected to the first fixed terminal 11. The second fixed contact 15 is connected to the second fixed terminal 12. The first fixed contact 14 and the second fixed contact 15 are arranged to be separated from each other in the left-right direction.

[0035] The movable contact piece 13 extends in the left-right direction. In this embodiment, the length direction of the movable contact piece 13 refers to the left-right direction. The movable contact piece 13 can move in the closing direction Z1 and the opening direction Z2. The closing direction Z1 is the direction in which the movable contact piece 13 approaches the first fixed contact 14 and the second fixed contact 15 ( Figure 1 The disconnection direction Z2 is the direction in which the movable contact piece 13 moves away from the first fixed contact 14 and the second fixed contact 15 ( Figure 1 ).

[0036] The first movable contact 16 and the second movable contact 17 are connected to the movable contact piece 13. The first movable contact 16 and the second movable contact 17 are arranged to be separated from each other in the left-right direction. The first movable contact 16 is opposite to the first fixed contact 14 in the up-down direction. The second movable contact 17 is opposite to the second fixed contact 15 in the up-down direction. The first fixed contact 14 is arranged in the closing direction Z1 (upper) relative to the first movable contact 16. The second fixed contact 15 is arranged in the closing direction Z1 (upper) relative to the second movable contact 17.

[0037] The movable mechanism 10 supports the movable contact piece 13. The movable mechanism 10 is configured to be movable in the closing direction Z1 and the disconnecting direction Z2 together with the movable contact piece 13. The movable mechanism 10 includes a drive shaft 19, a first holding member 25, a second holding member 26, and a contact spring 27. The drive shaft 19 extends in the up-down direction. The drive shaft 19 is connected to the movable contact piece 13. The drive shaft 19 extends downward from the movable contact piece 13. A hole 13a is provided in the movable contact piece 13. The drive shaft 19 is inserted into the hole 13a. The movable contact piece 13 can move relative to the drive shaft 19 in the closing direction Z1 and the disconnecting direction Z2.

[0038] The drive shaft 19 is arranged to be movable to a closed position and an open position. Figure 1 Indicates the drive shaft 19 in the disconnected position. Figure 1 As shown, when the drive shaft 19 is in the off position, the movable contacts 16 , 17 are separated from the fixed contacts 14 , 15 . Figure 2 The drive shaft 19 is shown in the closed position. Figure 2 As shown, when the drive shaft 19 is in the closed position, the movable contacts 16 , 17 are in contact with the fixed contacts 14 , 15 .

[0039] The first holding member 25 is fixed to the drive shaft 19. The contact spring 27 is disposed between the movable contact piece 13 and the first holding member 25. When the movable contacts 16 and 17 are in contact with the fixed contacts 14 and 15, the contact spring 27 urges the movable contact piece 13 in the closing direction Z1. The second holding member 26 is fixed to the drive shaft 19. The movable contact piece 13 is located between the second holding member 26 and the contact spring 27.

[0040] The driving device 4 moves the movable contact piece 13 by electromagnetic force. The driving device 4 moves the movable mechanism 10 in the closing direction Z1 and the opening direction Z2. Thus, the driving device 4 moves the movable contact piece 13 in the closing direction Z1 and the opening direction Z2. The driving device 4 includes a movable iron core 31, a coil 32, a fixed iron core 33, a yoke 34 and a return spring 35.

[0041] The movable iron core 31 is connected to the drive shaft 19. The movable iron core 31 is configured to be movable in the closing direction Z1 and the opening direction Z2. The coil 32 generates an electromagnetic force that moves the movable iron core 31 in the closing direction Z1 by energizing. The fixed iron core 33 is arranged relative to the movable iron core 31. The return spring 35 is arranged between the movable iron core 31 and the fixed iron core 33. The return spring 35 applies force to the movable iron core 31 in the opening direction Z2.

[0042] The yoke 34 is arranged so as to surround the coil 32. The yoke 34 is arranged on the magnetic path formed by the coil 32. The yoke 34 is arranged above the coil 32, on the side of the coil 32, and below the coil 32.

[0043] Next, the first fixed terminal 11 and the second fixed terminal 12 are described in detail. Figure 1 As shown, the entire first fixed terminal 11 is located in the closing direction relative to the movable contact piece 13. The first fixed terminal 11 includes a first supporting portion 41, a first extending portion 42, a first connecting portion 43 and a first external terminal 44. The first supporting portion 41, the first extending portion 42 and the first connecting portion 43 have a plate-like shape. The first external terminal 44 has a cylindrical shape. The first supporting portion 41, the first extending portion 42 and the first connecting portion 43 may also be integrated. Alternatively, at least a portion of the first supporting portion 41, the first extending portion 42 and the first connecting portion 43 may also be separate.

[0044] The first support portion 41 is opposite to the movable contact piece 13. The first support portion 41 is located above the movable contact piece 13. The first fixed contact 14 is connected to the first support portion 41. The first support portion 41 supports the first fixed contact 14. The first support portion 41 extends from the first fixed contact 14 toward the first side X1. The first side X1 is defined as a direction in the length direction of the movable contact piece 13. In this embodiment, the first side X1 is Figure 1 The movable contact piece 13 includes a first end portion 131 and a second end portion 132 in the length direction. In this embodiment, the first end portion 131 is Figure 1 The first support portion 41 is the left end of the movable contact piece 13, and the second end portion 132 is the right end of the movable contact piece 13. The first support portion 41 extends in the longitudinal direction of the movable contact piece 13 to a position exceeding the first end portion 131 of the movable contact piece 13. That is, the left end of the first support portion 41 is located to the left of the first end portion 131.

[0045] The first extension portion 42 is connected to the first support portion 41, and the first extension portion 42 extends from the first support portion 41 in the closing direction Z1. The first extension portion 42 is arranged to be away from the movable contact piece 13 on the first side X1. The first extension portion 42 is arranged to be separated from the contact surface between the first fixed contact 14 and the first movable contact 16 on the first side X1. Figure 3 yes Figure 1 The III-III section view in the figure. Figure 3 As shown, the first extension portion 42 is disposed at a position that does not overlap with the movable contact piece 13 when viewed from the closing direction Z1 or the opening direction Z2 .

[0046] The first connecting portion 43 is connected to the first extending portion 42. The first connecting portion 43 extends from the upper end of the first extending portion 42 toward the second side X2. The second side X2 is defined as a direction opposite to the first side X1 in the length direction of the movable contact piece 13. In this embodiment, the second side X2 is Figure 1 The first external terminal 44 is connected to the first connection portion 43. The first external terminal 44 extends from the first connection portion 43 in the closing direction Z1. The first external terminal 44 protrudes to the outside of the housing 3.

[0047] The entirety of the second fixed terminal 12 is located in the closing direction Z1 relative to the movable contact piece 13. The second fixed terminal 12 includes a second support portion 45, a second extension portion 46, a second connection portion 47, and a second external terminal 48. The second support portion 45, the second extension portion 46, and the second connection portion 47 have a plate-like shape. The second external terminal 48 has a cylindrical shape. The second support portion 45, the second extension portion 46, and the second connection portion 47 may also be integrated. Alternatively, at least a portion of the second support portion 45, the second extension portion 46, and the second connection portion 47 may also be separate.

[0048] The second support portion 45 is opposite to the movable contact piece 13. The second support portion 45 is located above the movable contact piece 13. The second fixed contact 15 is connected to the second support portion 45. The second support portion 45 supports the second fixed contact 15. The second support portion 45 extends from the second fixed contact 15 toward the second side X2. The second support portion 45 extends from the second fixed contact 15 in a direction away from the first support portion 41. The second support portion 45 extends in the length direction of the movable contact piece 13 to a position exceeding the second end 132 of the movable contact piece 13. That is, the right end of the second support portion 45 is located to the right of the second end 132.

[0049] The second extension portion 46 is connected to the second support portion 45, and the second extension portion 46 extends from the second support portion 45 in the closing direction Z1. The second extension portion 46 is configured to be away from the movable contact piece 13 on the second side X2. The second extension portion 46 is configured to be separated from the contact surface between the second fixed contact 15 and the second movable contact 17 on the second side X2. Figure 3 As shown, the second extension portion 46 is disposed at a position that does not overlap with the movable contact piece 13 when viewed from the closing direction Z1 or the opening direction Z2 .

[0050] The second connection portion 47 is connected to the second extension portion 46. The second connection portion 47 extends from the upper end of the second extension portion 46 toward the first side X1. The second connection portion 47 extends from the upper end of the second extension portion 46 in a direction toward the first connection portion 43. The second external terminal 48 is connected to the second connection portion 47. The second external terminal 48 extends from the second connection portion 47 in the closing direction Z1. The second external terminal 48 protrudes to the outside of the housing 3.

[0051] The first extension portion 42 and the second extension portion 46 are arranged to be separated from each other in the length direction of the movable contact piece 13. The first extension portion 42 and the second extension portion 46 are arranged outside the movable contact piece 13 in the length direction of the movable contact piece 13. In the length direction of the movable contact piece 13, the distance between the first extension portion 42 and the second extension portion 46 is greater than the length of the movable contact piece 13. In the length direction of the movable contact piece 13, the distance between the first support portion 41 and the second support portion 45 is smaller than the length of the movable contact piece 13. In the length direction of the movable contact piece 13, the distance between the first connection portion 43 and the second connection portion 47 is smaller than the length of the movable contact piece 13.

[0052] Next, the operation of the electromagnetic relay 1a is described. When the coil 32 is not energized, the drive device 4 is not excited. In this case, the drive shaft 19 and the movable iron core 31 are pressed in the disconnection direction Z2 by the elastic force of the return spring 35. Therefore, the drive shaft 19 is located Figure 1 In this state, the movable contact piece 13 is also pressed in the disconnection direction Z2 via the movable mechanism 10. Therefore, when the drive shaft 19 is in the disconnection position, the first movable contact 16 and the second movable contact 17 are separated from the first fixed contact 14 and the second fixed contact 15.

[0053] If the coil 32 is energized, the drive device 4 is excited. In this case, the movable iron core 31 overcomes the elastic force of the return spring 35 by the electromagnetic force of the coil 32 and moves in the closing direction Z1. As a result, the drive shaft 19 moves in the closing direction Z1 together with the movable contact piece 13. Figure 2 As shown, the drive shaft 19 moves toward the closed position. As a result, Figure 2 As shown, when the driving shaft 19 is in the closed position, the first movable contact 16 and the second movable contact 17 are in contact with the first fixed contact 14 and the second fixed contact 15 respectively.

[0054] When the current of the coil 32 stops and the coil 32 is demagnetized, the movable iron core 31 is pressed in the disconnection direction Z2 by the elastic force of the return spring 35. As a result, the drive shaft 19 moves in the disconnection direction Z2 together with the movable contact piece 13. Figure 1As shown in FIG. 1 , the movable mechanism 10 moves toward the disconnected position. As a result, when the movable mechanism 10 is in the disconnected position, the first movable contact 16 and the second movable contact 17 are separated from the first fixed contact 14 and the second fixed contact 15 .

[0055] In the electromagnetic relay 1a of the present embodiment described above, the first extension portion 42 of the first fixed terminal 11 is configured separately from the movable contact piece 13 to the first side X1. The second extension portion 46 of the second fixed terminal 12 is configured separately from the movable contact piece 13 to the second side X2. Therefore, the distance between the first extension portion 42 and the second extension portion 46 becomes larger. Thus, by reducing the Lorentz force acting on the movable contact piece 13 in the disconnection direction, the reduction of the contact force of the contact point can be suppressed. In addition, the first support portion 41, the first extension portion 42, the second support portion 45 and the second extension portion 46 are located in the closing direction Z1 relative to the movable contact piece 13. Therefore, when assembling the electromagnetic relay 1a, the movable contact piece 13 is not easy to interfere with the first fixed terminal 11 and the second fixed terminal 12. As a result, the assemblability is improved.

[0056] Next, an electromagnetic relay 1 b according to a second embodiment will be described. Figure 4 1 is a side cross-sectional view of the electromagnetic relay 1b of the second embodiment. In the structure of the electromagnetic relay 1b of the second embodiment, the same reference numerals as those of the electromagnetic relay 1a of the first embodiment are given to the structures corresponding to those of the electromagnetic relay 1a of the first embodiment.

[0057] like Figure 4 As shown, in the electromagnetic relay 1b of the second embodiment, the first connection portion 43 of the first fixed terminal 11 extends from the first extension portion 42 toward the first side X1. The second connection portion 47 of the second fixed terminal 12 extends from the second extension portion 46 toward the second side X2. That is, the first connection portion 43 and the second connection portion 47 extend in directions separated from each other. The first connection portion 43 protrudes from the housing 3 to the outside of the housing 3. The first connection portion 43 protrudes from the housing 3 to the first side X1. The second connection portion 47 protrudes from the housing 3 to the outside of the housing 3. The second connection portion 47 protrudes from the housing 3 to the second side X2. The other structures of the electromagnetic relay 1b of the second embodiment are the same as those of the electromagnetic relay 1a of the first embodiment.

[0058] Next, an electromagnetic relay 1c according to a third embodiment will be described. Figure 5 1 is a side cross-sectional view of an electromagnetic relay 1c according to a third embodiment. In the structure of the electromagnetic relay 1c according to the third embodiment, components corresponding to those of the electromagnetic relay 1a according to the first embodiment are denoted by the same reference numerals as those of the electromagnetic relay 1a according to the first embodiment.

[0059] like Figure 5 As shown, the electromagnetic relay 1c of the third embodiment includes a first magnetic shielding component 51 and a second magnetic shielding component 52. The first magnetic shielding component 51 and the second magnetic shielding component 52 are made of magnetic materials. The first magnetic shielding component 51 is arranged between the first extension portion 42 and the movable contact piece 13 in the longitudinal direction of the movable contact piece 13. The first magnetic shielding component 51 is arranged at the second side X2 relative to the first extension portion 42. The second magnetic shielding component 52 is arranged between the second extension portion 46 and the movable contact piece 13 in the longitudinal direction of the movable contact piece 13. The second magnetic shielding component 52 is arranged at the first side X1 relative to the second extension portion 46. The first magnetic shielding component 51 and the second magnetic shielding component 52 are arranged between the first extension portion 42 and the second extension portion 46. The other structures of the electromagnetic relay 1c of the third embodiment are the same as those of the electromagnetic relay 1a of the first embodiment.

[0060] In the electromagnetic relay 1c of the third embodiment, the magnetic flux generated when energized is concentrated on the first magnetic shield 51 and the second magnetic shield 52. Therefore, the magnetic flux density above the movable contact piece 13 is reduced. As a result, the Lorentz force acting on the movable contact piece 13 in the opening direction is reduced.

[0061] Next, an electromagnetic relay 1d according to a fourth embodiment will be described. Figure 6 1 is a side cross-sectional view of an electromagnetic relay 1d according to a fourth embodiment. In the structure of the electromagnetic relay 1d according to the fourth embodiment, components corresponding to those of the electromagnetic relay 1a according to the first embodiment are denoted by the same reference numerals as those of the electromagnetic relay 1a according to the first embodiment.

[0062] like Figure 6 As shown, the electromagnetic relay 1d of the fourth embodiment has the same first fixed terminal 11 and second fixed terminal 12 as the electromagnetic relay 1b of the second embodiment. The electromagnetic relay 1d of the fourth embodiment has the same first magnetic shielding component 51 and second magnetic shielding component 52 as the electromagnetic relay 1c of the third embodiment. The other structures of the electromagnetic relay 1d of the fourth embodiment are the same as those of the electromagnetic relay 1b of the second embodiment.

[0063] In the electromagnetic relay 1c of the third embodiment or the electromagnetic relay 1d of the fourth embodiment, the first magnet and the second magnet may be arranged instead of the first magnetic shielding member 51 and the second magnetic shielding member 52. The first magnet and the second magnet may be permanent magnets. The first magnet and the second magnet may be arranged so as to cancel the direction of the magnetic flux generated when power is supplied.

[0064] Next, an electromagnetic relay 1 e according to a fifth embodiment will be described. Figure 71 is a side cross-sectional view of the electromagnetic relay 1e of the fifth embodiment. In the structure of the electromagnetic relay 1e of the fifth embodiment, the same reference numerals as those of the electromagnetic relay 1a of the first embodiment are given to the structures corresponding to the structures of the electromagnetic relay 1a of the first embodiment. Figure 7 As shown, in the electromagnetic relay 1e of the fifth embodiment, the distance L1 between the first fixed contact 14 and the first extension portion 42 is greater than the length L2 of the abutment surface between the first movable contact 16 and the first fixed contact 14. The distance L3 between the second fixed contact 15 and the second extension portion 46 is greater than the length L4 of the abutment surface between the second movable contact 17 and the second fixed contact 15. The other structures of the electromagnetic relay 1e of the fifth embodiment are the same as those of the electromagnetic relay 1a of the first embodiment.

[0065] As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the gist of the invention.

[0066] The shape or configuration of the first fixed terminal 11, the second fixed terminal 12 or the movable contact piece 13 may also be changed. For example, the first fixed terminal 11 and the second fixed terminal 12 are not limited to bilaterally symmetrical shapes, but may also be asymmetrical. The shape or configuration of the movable iron core 31, the coil 32, the fixed iron core 33 or the yoke 34 may also be changed. The shape or configuration of the first fixed contact 14, the second fixed contact 15, the first movable contact 16, and the second movable contact 17 may also be changed.

[0067] The first fixed contact 14 may be separate from the first fixed terminal 11, or may be integrated. The second fixed contact 15 may be separate from the second fixed terminal 12, or may be integrated. The first movable contact 16 may be separate from the movable contact piece 13, or may be integrated. The second movable contact 17 may be separate from the movable contact piece 13, or may be integrated.

[0068] The directions in which the first connection portion 43 of the first fixed terminal 11 and the second connection portion 47 of the second fixed terminal 12 extend outward are not limited to the above-mentioned embodiments. The first connection portion 43 and the second connection portion 47 may also extend in the front-to-back direction. In addition, the first connection portion 43 and the second connection portion 47 may extend in the same direction as each other, or may extend in different directions from each other.

[0069] The arrangement of the first magnet and the second magnet is not limited to the arrangement of the first magnetic shielding member 51 and the second magnetic shielding member 52 of the electromagnetic relay 1c of the third embodiment, and may be changed. Figure 8As shown, the first magnet 53 may also be disposed outside the first fixed terminal 11. The second magnet 54 may also be disposed outside the second fixed terminal 12. The first magnet 53 and the second magnet 54 may also be connected to the yoke 34.

[0070] The arrangement of the first magnet and the second magnet is not limited to the arrangement of the first magnetic shielding member 51 and the second magnetic shielding member 52 of the electromagnetic relay 1d of the fourth embodiment, and may be changed. Fig. 9 As shown, the first magnet 53 may also be disposed outside the first fixed terminal 11. The second magnet 54 may also be disposed outside the second fixed terminal 12. The first magnet 53 and the second magnet 54 may also be connected to the yoke 34.

[0071] like Fig.10 As shown, the first magnet 55 and the second magnet 56 may also be arranged in the front-rear direction of the movable contact piece 13. Fig.11 As shown, the movable mechanism 10 may also include a movable yoke 57 and a fixed yoke 58. The movable yoke 57 is movable relative to the drive shaft 19. The fixed yoke 58 is fixed to the drive shaft 19. When power is supplied to the movable contact piece 13, a magnetic circuit is formed by the movable yoke 57 and the fixed yoke 58. As a result, the movable contact piece 13 is held by the movable yoke 57 and the fixed yoke 58, thereby suppressing the repulsion of the movable contact piece 13.

[0072] Industrial Applicability

[0073] According to the present invention, in the electromagnetic relay, it is possible to suppress a decrease in the contact force of the contacts and to improve assemblability.

Claims

1. An electromagnetic relay, characterized in that: have: A movable contact piece capable of moving in a closing direction and an opening direction opposite to the closing direction; a first movable contact point connected to the movable contact piece; a second movable contact point connected to the movable contact piece; a first fixed contact arranged relative to the first movable contact in the closing direction; a second fixed contact disposed opposite to the second movable contact in the closing direction; a first fixed terminal connected to the first fixed contact; as well as a second fixed terminal connected to the second fixed contact, The first fixed terminal comprises: a first supporting portion, which is located in the closing direction relative to the movable contact piece, supports the first fixed contact, and extends from the first fixed contact toward a first side in a length direction of the movable contact piece; and a first extension portion connected to the first support portion, extending from the first support portion toward the closing direction, and disposed away from the movable contact piece toward the first side, The second fixed terminal comprises: a second supporting portion, which is located in the closing direction relative to the movable contact piece, supports the second fixed contact, and extends from the second fixed contact toward a second side opposite to the first side in the length direction of the movable contact piece; and a second extension portion connected to the second support portion, extending from the second support portion toward the closing direction, and disposed away from the movable contact piece toward the second side, The device further includes a housing that accommodates the movable contact piece, the first movable contact point, the second movable contact point, the first fixed contact point, and the second fixed contact point. The first fixed terminal also includes: A first connecting portion connected to the first extending portion and extending from the first extending portion toward the second side; and a first external terminal connected to the first connecting portion and protruding toward the outside of the housing, The second fixed terminal further includes: A second connecting portion connected to the second extending portion and extending from the second extending portion toward the first side; and A second external terminal is connected to the second connection portion and protrudes toward the outside of the housing.

2. The electromagnetic relay according to claim 1, characterized in that: The first fixed terminal further includes a first connecting portion connected to the first extending portion. The first connecting portion extends from the first extending portion toward the first side. The second fixed terminal further includes a second connecting portion connected to the second extending portion. The second connecting portion extends from the second extending portion toward the second side.

3. The electromagnetic relay according to claim 2, characterized in that: The device further includes a housing that accommodates the movable contact piece, the first movable contact point, the second movable contact point, the first fixed contact point, and the second fixed contact point. The first connection portion protrudes from the housing toward the outside of the housing, The second connection portion protrudes from the housing toward the outside of the housing.

4. The electromagnetic relay according to any one of claims 1 to 3, characterized in that: Also available: a first magnet configured to cancel the orientation of a magnetic flux generated when power is supplied to the first movable contact and the first fixed contact; and The second magnet is configured to cancel the direction of magnetic flux generated when the second movable contact and the second fixed contact are energized.

5. The electromagnetic relay according to any one of claims 1 to 3, characterized in that: Also available: a first magnetic shielding member disposed between the first extending portion and the movable contact piece in the longitudinal direction of the movable contact piece; and A second magnetic shield member is disposed between the second extending portion and the movable contact piece in a longitudinal direction of the movable contact piece.

6. The electromagnetic relay according to any one of claims 1 to 3, characterized in that: In the length direction of the movable contact piece, a distance between the first extension portion and the second extension portion is greater than a length of the movable contact piece.

7. The electromagnetic relay according to any one of claims 1 to 3, characterized in that: The distance between the first fixed contact and the first extension portion is greater than the length of the contact surface between the first movable contact and the first fixed contact. A distance between the second fixed contact and the second extending portion is greater than a length of a contact surface between the second movable contact and the second fixed contact.

8. The electromagnetic relay according to any one of claims 1 to 3 When viewed from the closing direction or the opening direction, the first extension portion is arranged at a position not overlapping with the movable contact piece. The second extending portion is arranged at a position not overlapping with the movable contact piece when viewed from the closing direction or the opening direction.

9. The electromagnetic relay according to any one of claims 1 to 3, characterized in that: Also available: a driving shaft connected to the movable contact piece and extending from the movable contact piece toward the disconnecting direction; and a driving device, which is arranged in the disconnection direction relative to the movable contact piece, The driving device comprises: A movable iron core connected to the driving shaft and capable of moving in the closing direction and the opening direction; and A coil generates an electromagnetic force for moving the movable iron core.

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