Electromagnetic relay

Abstract

An electromagnetic relay includes a fixed terminal, a movable contact piece, a housing, and a heat dissipation structure. The fixed terminal includes a first surface, a second surface opposite to the first surface, and a fixed contact arranged on the first surface. The movable contact piece includes a movable contact capable of contacting the fixed contact. The housing includes a receiving space, which receives a part of the fixed terminal, the fixed contact, and the movable contact piece. The heat dissipation structure includes a heat dissipation space, which is arranged on the second surface side of the fixed terminal and releases the heat of the fixed terminal to the outside of the receiving space.

Description

Technical Field

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

[0002] In the past, electromagnetic relays for connecting and disconnecting circuits were known. The electromagnetic relay described in Patent Document 1 includes: a fixed terminal including a fixed contact, a movable contact piece including a movable contact, a drive shaft, and an electromagnetic drive device including a coil. The movable contact piece and the drive shaft are connected so as to be movable as a whole. The movable contact piece moves together with the drive shaft through the drive of the electromagnetic drive device, and the connection and disconnection of the circuit are realized by the contact or separation between the fixed contact and the movable contact.

[0003] When the fixed contact and the movable contact are in contact, that is, when power is turned on, the fixed terminal, the movable contact piece, and the coil of the electromagnetic drive device generate heat. Therefore, Patent Document 1 discloses the following structure: in order to efficiently release the heat generated by the coil of the electromagnetic drive device when power is turned on to the housing, an interposed component having a higher thermal conductivity than air is arranged in the gap between the electromagnetic drive device and the housing that accommodates the electromagnetic drive device.

[0004] In Patent Document 1, even if the heat generated by the coil of the electromagnetic drive device when energized can be efficiently released to the housing, it is difficult to efficiently release the heat generated by the fixed terminal and the movable contact piece when energized.

[0005] Patent Document 1: Japanese Patent No. 6300153 Summary of the invention

[0006] An object of the present invention is to provide an electromagnetic relay capable of effectively releasing heat generated by a fixed terminal and a movable contact piece when power is supplied.

[0007] (1) An electromagnetic relay according to one embodiment of the present invention comprises a fixed terminal, a movable contact piece, a housing and a heat dissipation structure. The fixed terminal comprises a first surface, a second surface opposite to the first surface, and a fixed contact point arranged on the first surface. The movable contact piece comprises a movable contact point capable of contacting the fixed contact point. The housing comprises a receiving space, which receives a part of the fixed terminal, the fixed contact point and the movable contact piece. The heat dissipation structure comprises a heat dissipation space, which is arranged on the second surface side of the fixed terminal and releases the heat of the fixed terminal to the outside of the receiving space.

[0008] In the electromagnetic relay, since the heat dissipation space for releasing the heat of the fixed terminal is arranged on the second surface side of the fixed terminal, the heat generated by the fixed terminal when energized can be efficiently released from the second surface side of the fixed terminal to the outside of the accommodation space. In addition, the heat generated by the movable contact piece can be efficiently released to the outside of the accommodation space via the fixed terminal.

[0009] (2) Preferably, the heat dissipation structure further includes a heat conducting component, which is disposed in the heat dissipation space and has a higher thermal conductivity than air. In this case, the heat generated by the fixed terminal when energized can be further efficiently released from the second surface side of the fixed terminal to the outside of the accommodation space by the heat conducting component.

[0010] (3) The heat conducting component is preferably arranged in contact with at least one of the housing and the fixed terminal. In this case, since the heat conducting component is arranged in contact with at least one of the housing and the fixed terminal, the heat generated by the fixed terminal when power is supplied can be further efficiently released to the outside of the accommodation space.

[0011] (4) Preferably, the heat dissipation structure further includes a vent connecting the heat dissipation space to the outside of the housing. In this case, heat generated by the fixed terminal when energized can be more efficiently released from the heat dissipation space to the outside of the housing space.

[0012] (5) Preferably, a contact housing is further provided, which divides the accommodation space and the heat dissipation space and supports the fixed terminal, and the heat dissipation space is arranged adjacent to the accommodation space. In this case, heat generated by the fixed terminal can be effectively released to the heat dissipation space via the contact housing.

[0013] (6) Preferably, the electromagnetic relay further comprises a drive shaft and an electromagnetic drive device. The drive shaft is capable of moving together with the movable contact piece in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact moves away from the fixed contact. The electromagnetic drive device moves the drive shaft in the first direction and the second direction. The contact housing includes a bottom and a contact support portion which is arranged at a position closer to the second direction side than the bottom and supports the fixed terminal. The second surface of the fixed terminal is supported by the contact support portion of the contact housing. The heat dissipation space is arranged on the first direction side of the contact support portion. In this case, by forming the contact support portion, the space formed on the first direction side of the contact support portion can be effectively used as the heat dissipation space.

[0014] (7) Preferably, the electromagnetic drive device includes a yoke disposed on the first direction side of the heat dissipation space, and the heat dissipation space is surrounded by the contact support portion of the contact housing and the yoke. In this case, heat generated by the fixed terminal when energized can be released to the yoke.

[0015] (8) Preferably, the electromagnetic relay further comprises a contact housing, a drive shaft and an electromagnetic drive device. The contact housing is divided into a storage space and a heat dissipation space. The drive shaft can move together with the movable contact piece in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact moves away from the fixed contact. The electromagnetic drive device includes a yoke arranged on the first direction side of the heat dissipation space, so that the drive shaft moves in the first direction and the second direction. The contact housing includes a bottom and a contact support portion arranged at a position closer to the second direction side than the bottom and supporting the fixed terminal. The second surface of the fixed terminal is supported by the contact support portion of the contact housing. The heat dissipation space is arranged at a position adjacent to the storage space on the first direction side of the contact support portion. The heat conductive component is arranged in a manner in contact with at least one of the contact housing and the yoke. In this case, since the heat conductive component is arranged in a manner in contact with at least one of the contact housing and the yoke, the heat generated by the fixed terminal when power is turned on can be further efficiently released to the outside of the storage space.

[0016] (9) Preferably, the heat dissipation structure further includes a vent connecting the heat dissipation space to the outside of the housing. In this case, in addition to the above effects, heat generated by the fixed terminal when energized can be further efficiently released from the heat dissipation space to the outside of the housing space.

[0017] According to the present invention, it is possible to provide an electromagnetic relay capable of effectively releasing heat generated by a fixed terminal and a movable contact piece when power is supplied. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of an electromagnetic relay according to one embodiment of the present invention.

[0019] Figure 2 is a top view of the contact housing.

[0020] Figure 3 It is an enlarged cross-sectional view of the periphery of the contact housing.

[0021] Figure 4 This is a cross-sectional view of an electromagnetic relay when voltage is applied to the coil.

[0022] Figure 5 It is an enlarged cross-sectional view of the periphery of the contact housing according to the first modified example.

[0023] Figure 6 It is an enlarged cross-sectional view of the periphery of a contact housing according to a second modified example.

[0024] Figure 7 It is a schematic side view of an electromagnetic relay according to a fourth modification.

[0025] Figure 8 It is a schematic side view of an electromagnetic relay according to a fourth modification.

[0026] Explanation of symbols:

[0027] 2: Shell;

[0028] 2c: Containment space;

[0029] 4: driving shaft;

[0030] 5: Electromagnetic drive device;

[0031] 6: Heat dissipation structure;

[0032] 6a: first heat dissipation space (an example of heat dissipation space);

[0033] 6b: a first heat conducting member (an example of a heat conducting member);

[0034] 6c: second heat dissipation space (an example of heat dissipation space);

[0035] 6d: a second heat conducting member (an example of a heat conducting member);

[0036] 11: contact housing;

[0037] 11a: bottom;

[0038] 11e: a first contact support portion (an example of a contact support portion);

[0039] 11f: a second contact support portion (an example of a contact support portion);

[0040] 14: a first fixed terminal (an example of a fixed terminal);

[0041] 14a: first side;

[0042] 14b: Second side;

[0043] 14c: a first fixed contact (an example of a fixed contact);

[0044] 15: second fixed terminal (an example of a fixed terminal);

[0045] 15a: first side;

[0046] 15b: second side;

[0047] 15c: a second fixed contact (an example of a fixed contact);

[0048] 16: movable contact piece;

[0049] 16a: a first movable contact (an example of a movable contact);

[0050] 16b: a second movable contact (an example of a movable contact);

[0051] 37a: a first yoke (an example of a yoke);

[0052] 40: vent;

[0053] 100: electromagnetic relay;

[0054] 102: Shell;

[0055] 102c: Containment space;

[0056] 105: electromagnetic drive device;

[0057] 106: heat dissipation structure;

[0058] 106a: heat dissipation space;

[0059] 106b: heat conducting component;

[0060] 114: Fixed terminal;

[0061] 114a: Page 1;

[0062] 114b: Side 2;

[0063] 114c: fixed contact;

[0064] 116: movable contact piece;

[0065] 116a: movable contact;

[0066] 200: Electromagnetic relay;

[0067] Z1: contact direction (an example of the first direction);

[0068] Z2: separation direction (an example of the second direction). DETAILED DESCRIPTION

[0069] Hereinafter, an embodiment of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. Figure 1 is a cross-sectional view of the electromagnetic relay 100. Figure 1 As shown in FIG. 1 , the electromagnetic relay 100 includes a housing 2, a contact device 3, a drive shaft 4, an electromagnetic drive device 5, and a heat dissipation structure 6. In the following description, the direction in which the axis Ax of the drive shaft 4 extends is referred to as the "axial direction". In addition, when referring to the drawings, in order to facilitate the understanding of the description, Figure 1 The upper side in the description is set as "upper", the lower side is set as "lower", the left side is set as "left", and the right side is set as "right". In addition, in this embodiment, Figure 1 The lower part of the diagram is the contact direction Z1. Figure 1 The upper side in the figure is the separation direction Z2. The details of the contact direction Z1 and the separation direction Z2 will be described later.

[0070] The housing 2 includes a housing 2a and a cover 2b. The housing 2a is a roughly quadrilateral box-shaped body, which is open at the top. The cover 2b covers the top of the housing 2a. The interior of the housing 2 is sealed by the housing 2a and the cover 2b. The housing 2a and the cover 2b are formed of insulating materials. The contact device 3, the drive shaft 4, and the electromagnetic drive device 5 are accommodated inside the housing 2.

[0071] The housing 2 includes a housing space 2c for housing the contact device 3. In the present embodiment, the housing space 2c is surrounded by a contact housing 11 and a contact cover 12 disposed in the housing 2. The contact housing 11 and the contact cover 12 are formed of a material having insulating properties.

[0072] Figure 2 1 is a top view of the contact housing 11. Figure 1 and Figure 2 As shown, the contact housing 11 includes a bottom 11a, a cylindrical portion 11b, an inner wall 11c and an outer wall 11d. The bottom 11a is formed in a rectangular plate shape. The length direction of the bottom 11a is Figure 1 The left and right directions in are consistent.

[0073] The cylindrical portion 11b extends in a cylindrical shape in the axial direction. The cylindrical portion 11b protrudes downward from the center of the bottom 11a, and protrudes upward from the center of the bottom 11a. The cylindrical portion 11b includes a through hole 18 that penetrates the bottom 11a in the axial direction. The through hole 18 penetrates the center of the bottom 11a in the axial direction. The drive shaft 4 penetrates the through hole 18 in the axial direction.

[0074] The inner wall 11c is rectangular in a plan view and extends upward from the bottom 11a in a plate-like shape so as to surround the outer circumference of the cylindrical portion 11b. The inner wall 11c extends upward longer than the cylindrical portion 11b. A part of the contact piece holding portion 17 described below is accommodated in the space surrounded by the inner wall 11c.

[0075] The outer wall 11d is formed at a position farther from the cylindrical portion 11b than the inner wall 11c. The outer wall 11d extends upward from the bottom portion 11a in a plate-like shape. The outer wall 11d has a substantially rectangular shape in a plan view and extends upward longer than the inner wall 11c.

[0076] The contact housing 11 further includes a first contact support portion 11e and a second contact support portion 11f. The first contact support portion 11e is disposed at a position to the left of the center of the bottom portion 11a in the length direction. The first contact support portion 11e is formed to protrude upward from the bottom portion 11a in a rectangular shape. The first contact support portion 11e is formed to penetrate a portion of the outer wall 11d in the left-right direction. The first contact support portion 11e is disposed opposite to the inner wall 11c in the left-right direction. The second contact support portion 11f is symmetrical in shape with the first contact support portion 11e, and therefore description thereof is omitted.

[0077] The contact cover 12 covers the upper portion of the contact housing 11. The contact cover 12 includes an arc extension wall 12a extending toward the bottom portion 11a along the outer wall 11d of the contact housing 11.

[0078] The contact device 3 includes a first fixed terminal 14, a second fixed terminal 15, a movable contact piece 16, and a contact piece holding portion 17. The first fixed terminal 14, the second fixed terminal 15, and the movable contact piece 16 are formed of a material having conductivity.

[0079] The first fixed terminal 14 is formed by bending a plate-shaped member. One end side of the first fixed terminal 14 is accommodated in the accommodation space 2c, and the other end side protrudes from the housing 2 in the left-right direction and is exposed outside the housing 2. The first fixed terminal 14 is arranged on the upper part of the first contact support portion 11e of the contact housing 11. The second surface 14b of the first fixed terminal 14, which will be described later, is supported by contacting with the first contact support portion 11e of the contact housing 11.

[0080] Figure 3 FIG. 1 is an enlarged cross-sectional view of the periphery of the contact housing 11. Figure 3 As shown, the first fixed terminal 14 includes a first surface 14a, a second surface 14b, a first fixed contact 14c and a first external connection portion 14d. The first surface 14a is a surface on the separation direction Z2 side. The second surface 14b is a surface on the opposite side of the first surface 14a and is a surface on the contact direction Z1 side. The second surface 14b is in contact with the first contact support portion 11e of the contact housing 11. In addition, the contact is not necessarily a direct contact, but may also be an indirect contact. The first fixed contact 14c is arranged on the first surface 14a in the accommodating space 2c.

[0081] The second fixed terminal 15 is supported by the second contact support portion 11f of the contact housing 11 in the housing 2. The second fixed terminal 15 includes a first surface 15a, a second surface 15b, a second fixed contact 15c, and a second external connection portion 15d. The second fixed terminal 15 is symmetrical with the first fixed terminal 14, so the description thereof is omitted.

[0082] The movable contact piece 16 is arranged in the receiving space 2c to be opposite to the first fixed contact 14c and the second fixed contact 15c. The movable contact piece 16 is arranged above the first fixed contact 14c and the second fixed contact 15c. The movable contact piece 16 includes a first movable contact 16a and a second movable contact 16b. The first movable contact 16a is arranged opposite to the first fixed contact 14c and can contact the first fixed contact 14c. The second movable contact 16b is arranged opposite to the second fixed contact 15c and can contact the second fixed contact 15c. In addition, Figure 3, a state in which the first movable contact 16a and the second movable contact 16b are in contact with the first fixed contact 14c and the second fixed contact 15c is shown.

[0083] The movable contact piece 16 is movable in a contact direction Z1 for contacting the first fixed contact 14c and the second fixed contact 15c and a separation direction Z2 for separating from the first fixed contact 14c and the second fixed contact 15c. The contact direction Z1 is an example of a first direction, and the separation direction Z2 is an example of a second direction.

[0084] The contact direction Z1 is a direction in which the first movable contact 16a and the second movable contact 16b contact the first fixed contact 14c and the second fixed contact 15c ( Figure 1 The separation direction Z2 is the direction in which the first movable contact 16a and the second movable contact 16b move away from the first fixed contact 14c and the second fixed contact 15c ( Figure 1 The contact direction Z1 and the separation direction Z2 are consistent with the axial direction.

[0085] like Figure 1 As shown, the contact piece holding portion 17 holds the movable contact piece 16 via the drive shaft 4. The contact piece holding portion 17 connects the movable contact piece 16 to the drive shaft 4. The contact piece holding portion 17 includes a bracket 24 and a contact spring 25. The movable contact piece 16 is clamped in the axial direction by the upper portion of the bracket 24 and the flange portion 4a of the drive shaft 4. The contact spring 25 is arranged between the bottom of the holder 24 and the flange portion 4a of the drive shaft 4, and applies force to the drive shaft 4 and the movable contact piece 16 toward the separation direction Z2 side.

[0086] The drive shaft 4 extends along the contact direction Z1 and the separation direction Z2. The drive shaft 4 is connected to the movable contact piece 16 via the contact piece holding portion 17. The drive shaft 4 is movable together with the movable contact piece 16 in the contact direction Z1 and the separation direction Z2.

[0087] The electromagnetic drive device 5 moves the drive shaft 4 in the contact direction Z1 and the separation direction Z2 by electromagnetic force. The electromagnetic drive device 5 is arranged in a space different from the accommodation space 2c in the housing 2. In the present embodiment, the electromagnetic drive device 5 is arranged below the contact housing 11.

[0088] The electromagnetic drive device 5 includes a coil 32 , a bobbin 33 , a movable iron core 34 , a fixed iron core 35 , a biasing member 36 , and a yoke 37 .

[0089] The coil 32 is mounted on the outer periphery of the bobbin 33. The bobbin 33 includes a receiving portion 33a. The receiving portion 33a is provided on the inner periphery of the bobbin 33. The receiving portion 33a is cylindrical and extends in the axial direction. The receiving portion 33a overlaps with the through hole 18 of the cylindrical portion 11b of the contact housing 11 in the axial direction. A portion of the drive shaft 4 is arranged in the receiving portion 33a.

[0090] The movable iron core 34 is arranged in the receiving portion 33a. The movable iron core 34 is cylindrical, and the drive shaft 4 passes through the center in the axial direction, and is connected to the drive shaft 4 in a manner that can move integrally. The movable iron core 34 can move axially together with the drive shaft 4. In this embodiment, the movable iron core 34 is guided in axial movement by the annular iron core 38 arranged in the receiving portion 33a.

[0091] The fixed iron core 35 is disposed within the housing portion 33a on the contact direction Z1 side relative to the movable iron core 34 so as to face the movable iron core 34. The fixed iron core 35 is fixed to the yoke 37.

[0092] The urging member 36 is, for example, a coil spring, and is disposed between the movable iron core 34 and the fixed iron core 35. The urging member 36 urges the movable iron core 34 in the separation direction Z2. Therefore, the urging member 36 is disposed between the movable iron core 34 and the fixed iron core 35 in a compressed state.

[0093] The yoke 37 includes a first yoke 37a and a second yoke 37b. The first yoke 37a is plate-shaped and is disposed between the bottom 11a of the contact housing 11 and the winding frame 33. The first yoke 37a is fixed to the bottom 11a of the contact housing 11 by a plurality of screw parts not shown. The first yoke 37a overlaps with the first contact support portion 11e and the second contact support portion 11f of the contact housing 11 in the axial direction. The first yoke 37a overlaps with the lower portion of the cylindrical portion 11b in the left-right direction. The first yoke 37a is connected to the annular core 38. The second yoke 37b is roughly U-shaped, and the bottom is disposed below the winding frame 33 and is connected to the fixed core 35. The upper ends of the two side portions of the second yoke 37b are connected to the first yoke 37a.

[0094] like Figure 3As shown, the heat dissipation structure 6 includes a first heat dissipation space 6a and a first heat conducting member 6b. The first heat dissipation space 6a is a space for dissipating the heat of the first fixed terminal 14 to the outside of the accommodation space 2c, and is arranged on the second surface 14b side of the first fixed terminal 14. More specifically, the first heat dissipation space 6a is arranged on the contact direction Z1 side of the first contact support portion 11e of the contact housing 11. The first heat dissipation space 6a is arranged at a position adjacent to the accommodation space 2c and is divided from the accommodation space 2c. In the present embodiment, the accommodation space 2c and the first heat dissipation space 6a are divided by the contact housing 11. The first heat dissipation space 6a is, for example, a substantially rectangular space formed on the contact direction Z1 side of the first contact support portion 11e when the contact housing 11 is resin-molded. The contact direction Z1 side of the first heat dissipation space 6a is covered by the first yoke 37a. Therefore, in the present embodiment, the first heat dissipation space 6a is surrounded by the first contact support portion 11e and the first yoke 37a.

[0095] The first heat-conducting component 6b is a component with a higher thermal conductivity than air. The first heat-conducting component 6b in this embodiment is preferably non-metallic, for example, formed of a material such as polyurethane, silicon or epoxy resin. The first heat-conducting component 6b is arranged in at least a portion of the first heat dissipation space 6a. In this embodiment, the first heat-conducting component 6b has a substantially rectangular shape and is arranged so as to fill the first heat dissipation space 6a. The first heat-conducting component 6b is arranged in contact with at least one of the first contact support portion 11e and the first yoke 37a. In this embodiment, the first heat-conducting component 6b is arranged in contact with both the first contact support portion 11e and the first yoke 37a. In addition, the first heat-conducting component 6b may also be made of metal. In this case, it is preferable to arrange an insulating component between the first heat-conducting component 6b and the first yoke 37a so that the first heat-conducting component 6b and the first yoke 37a are not in direct contact.

[0096] The heat dissipation structure 6 further includes a second heat dissipation space 6c and a second heat conducting member 6d. The second heat dissipation space 6c is a space for dissipating the heat of the second fixed terminal 15 to the outside of the accommodation space 2c, and is arranged on the second surface 15b side of the second fixed terminal 15. The second heat conducting member 6d is arranged in at least a portion of the second heat dissipation space 6c. In addition, the second heat dissipation space 6c and the second heat conducting member 6d are bilaterally symmetrical structures with the first heat dissipation space 6a and the first heat conducting member 6b, and therefore description thereof is omitted.

[0097] Next, the operation of electromagnetic relay 100 will be described. Figure 1Indicates a state where no voltage is applied to the coil 32. When no voltage is applied to the coil 32, the movable iron core 34 is prevented from moving in the contact direction Z1 by the biasing member 36. Therefore, the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14c and the second fixed contact 15c.

[0098] Figure 3 and Figure 4 Indicates the state of applying voltage to the coil 32. When voltage is applied to the coil 32 to excite it, the movable iron core 34 overcomes the elastic force of the force-applying member 36 and moves in the contact direction Z1 by the electromagnetic force of the coil 32. As the movable iron core 34 moves, the drive shaft 4 and the movable contact piece 16 move in the contact direction Z1, and the first movable contact 16a and the second movable contact 16b contact the first fixed contact 14c and the second fixed contact 15c.

[0099] When the voltage application to the coil 32 stops, the movable iron core 34 moves in the separation direction Z2 by the elastic force of the urging member 36, and the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14c and the second fixed contact 15c.

[0100] In the electromagnetic relay 100 of the present embodiment, the heat generated by the first fixed terminal 14, the second fixed terminal 15, and the movable contact piece 16 when the first movable contact 16a and the second movable contact 16b are in contact with the first fixed contact 14c and the second fixed contact 15c, that is, when the power is on, can be efficiently released to the outside of the accommodation space 2c by the heat dissipation structure 6. In detail, the heat generated by the first fixed terminal 14 can be released to the outside of the accommodation space 2c through the first heat dissipation space 6a and the first heat conducting member 6b. In addition, since the first heat conducting member 6b is arranged in contact with the first contact support portion 11e and the first yoke 37a, the heat generated by the first fixed terminal 14 when the power is on can be efficiently released to the first yoke 37a. In addition, the heat generated by the movable contact piece 16 when the power is on can be effectively released to the outside of the accommodation space 2c via the first fixed terminal 14. In addition, the heat generated by the second fixed terminal 15 when the power is on can be released to the outside of the accommodation space 2c through the second heat dissipation space 6c and the second heat conducting member 6d.

[0101] The above is a description of an embodiment of an electromagnetic relay according to one embodiment of the present invention, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the main purpose of the invention. For example, the structure of the electromagnetic drive device 5 can also be changed. The shape or configuration of the housing 2, the contact housing 11, the contact cover 12, and the yoke 37 can also be changed.

[0102] Figure 51 is an enlarged cross-sectional view of the contact housing 11 and its surroundings of the first modified example. The heat dissipation structure 6 involved in the first modified example further includes a vent 40 connecting the first heat dissipation space 6a to the outside of the housing 2. In addition, the heat dissipation structure 6 involved in the first modified example does not have the first heat conducting member 6b and the second heat conducting member 6d. The other structures are the same as those in the above embodiment.

[0103] The vent 40 is formed in a manner that penetrates the contact housing 11 and the housing 2a of the housing 2 in the left-right direction. In the present embodiment, the vent 40 is formed at a position overlapping with the first heat dissipation space 6a in the left-right direction. By providing the vent 40, the heat of the first fixed terminal 14 can be effectively released from the first heat dissipation space 6a to the outside of the accommodation space 2c. In addition, the vent 40 is also formed on the second fixed terminal 15 side, and the second heat dissipation space 6c is connected to the outside of the housing 2 through the vent 40.

[0104] Figure 6 2 is an enlarged cross-sectional view of the contact housing 11 and the surrounding area of ​​the second modified example. The heat dissipation structure 6 involved in the second modified example includes a first heat dissipation space 6a, a first heat conduction component 6b and a vent 40. In this case, the heat of the first fixed terminal 14 can be more efficiently released to the outside of the accommodation space 2c through the first heat conduction component 6b and the vent 40. In addition, the position, shape, etc. of the heat conduction components 6b, 6d and the vent 40 can be appropriately changed.

[0105] Figure 7 1 is a side view schematic diagram of an electromagnetic relay 200 of a fourth modification. The electromagnetic relay 200 of the fourth modification is a so-called hinge-type electromagnetic relay. The electromagnetic relay 200 includes a housing 102, a contact device 103, an electromagnetic drive device 105, and a heat dissipation structure 106. In addition, Figure 8 The figure shows a state where a voltage is applied to the coil 132 of the electromagnetic drive device 105. The operation of the electromagnetic relay 200 is the same as that of the conventional one, and therefore the description thereof will be omitted.

[0106] The housing 102 includes a base 102a, a housing 102b, and a storage space 102c. In the fourth modification, the storage space 102c is surrounded by the base 102a and the housing 102b.

[0107] The contact device 103 is accommodated in the accommodation space 102c. The contact device 103 includes a fixed terminal 114 and a movable contact piece 116. The fixed terminal 114 is supported by the base 102a. The fixed terminal 114 includes a fixed contact 114c arranged on the first surface 114a. The movable contact piece 116 is arranged opposite to the fixed terminal 114 and supported by the base 102a. The movable contact piece 116 is composed of a conductive leaf spring that can be elastically deformed. The movable contact piece 116 includes a movable contact 116a that can contact the fixed contact 114c.

[0108] The electromagnetic drive device 105 includes a movable iron piece 105 a having a substantially L-shape. The movable iron piece 105 a can press a clamping plate 150 rotatably supported on the bottom of the housing 102 in a contact direction Z1.

[0109] The heat dissipation structure 106 includes a heat dissipation space 106a and a heat conducting member 106b. The heat dissipation space 106a is provided on the second surface 114b side opposite to the first surface 114a of the fixed terminal 114, and releases the heat of the fixed terminal 114 to the outside of the accommodation space 102c. The contact direction Z1 side of the heat dissipation space 106a is surrounded by the housing 102b. At least a portion of the separation direction Z2 side of the heat dissipation space 106a is surrounded by the second surface 114b of the fixed terminal 114.

[0110] The heat-conducting component 106b is a component having a higher thermal conductivity than air. The heat-conducting component 106b is preferably non-metallic, for example, formed of a material such as polyurethane, silicon or epoxy resin. The heat-conducting component 106b is arranged in at least a portion of the heat dissipation space 106a. The heat-conducting component 106b is arranged to contact at least one of the housing 102 and the fixed terminal 114. In the present embodiment, the heat-conducting component 106b is arranged in contact with both the housing 102 and the fixed terminal 114. In addition, the heat-conducting component 106b may also be made of metal. In the case where the heat-conducting component 106b is made of metal, it is preferred to provide a gap between the heat-conducting component 106b and the fixed terminal 114, or to provide an insulating component between the heat-conducting component 106b and the fixed terminal 114.

[0111] In addition, if Figure 8As shown, the heat dissipation structure 106 may also include a vent 140. The vent 140 connects the heat dissipation space 106a to the outside of the housing 102. In the present embodiment, the vent 140 is formed by passing through the shell 102b of the housing 102. The vent 140 is preferably formed at a position overlapping with the fixed terminal 114 in the separation direction Z2. In addition, when the heat dissipation structure 106 includes the vent 140, the heat dissipation structure 106 does not necessarily need to include the heat conductive component 106b. In addition, the position, shape, etc. of the heat conductive component 106b and the vent 140 can be appropriately changed. For example, the vent 140 may also be formed at a position overlapping with the fixed terminal 114 in the separation direction Z2.

[0112] Industrial Applicability

[0113] According to the present invention, it is possible to provide an electromagnetic relay capable of effectively releasing heat generated by a fixed terminal and a movable contact piece when power is supplied.

Claims

1. An electromagnetic relay, comprising: A fixed terminal including a first surface, a second surface opposite to the first surface, and a fixed contact disposed on the first surface; a movable contact piece, comprising a movable contact point capable of contacting the fixed contact point; A housing having a receiving space, wherein the receiving space receives a portion of the fixed terminal, the fixed contact point, and the movable contact piece; as well as A heat dissipation structure having a heat dissipation space, wherein the heat dissipation space is provided on the second surface side of the fixed terminal and releases the heat of the fixed terminal to the outside of the accommodation space, The electromagnetic relay also has: A contact housing, which divides the accommodation space and the heat dissipation space and supports the fixed terminal; a drive shaft capable of moving together with the movable contact piece in a first direction in which the movable contact comes into contact with the fixed contact and in a second direction in which the movable contact moves away from the fixed contact; and an electromagnetic drive device, which moves the drive shaft in the first direction and the second direction, The contact housing includes a bottom and a contact support portion, wherein the contact support portion is disposed at a position closer to the second direction side than the bottom and supports the fixed terminal. The second surface of the fixed terminal is supported by the contact support portion of the contact housing. The heat dissipation space is arranged on the first direction side of the contact support portion and is arranged at a position adjacent to the accommodation space.

2. The electromagnetic relay according to claim 1, characterized in that: The heat dissipation structure further includes a heat conduction component, which is disposed in the heat dissipation space and has a higher thermal conductivity than air.

3. The electromagnetic relay according to claim 2, characterized in that: The thermally conductive member is disposed in contact with at least one of the housing and the fixed terminal.

4. The electromagnetic relay according to any one of claims 1 to 3, characterized in that: The heat dissipation structure further includes a vent that connects the heat dissipation space with the outside of the housing.

5. The electromagnetic relay according to claim 1, characterized in that: The electromagnetic driving device includes a yoke disposed on the first direction side of the heat dissipation space, The heat dissipation space is surrounded by the contact support portion of the contact housing and the yoke.

6. An electromagnetic relay, comprising: A fixed terminal including a first surface, a second surface opposite to the first surface, and a fixed contact disposed on the first surface; a movable contact piece, comprising a movable contact point capable of contacting the fixed contact point; A housing having a receiving space, wherein the receiving space receives a portion of the fixed terminal, the fixed contact point, and the movable contact piece; as well as A heat dissipation structure having a heat dissipation space, wherein the heat dissipation space is provided on the second surface side of the fixed terminal and releases the heat of the fixed terminal to the outside of the accommodation space, The heat dissipation structure further includes a heat conduction component, which is disposed in the heat dissipation space and has a higher thermal conductivity than air. The electromagnetic relay also has: A contact housing, which divides the receiving space and the heat dissipation space; a drive shaft capable of moving together with the movable contact piece in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact moves away from the fixed contact; as well as The electromagnetic drive device includes a yoke disposed on the first direction side of the heat dissipation space, and moves the drive shaft in the first direction and the second direction. The contact housing includes a bottom and a contact support portion, wherein the contact support portion is arranged at a position closer to the second direction side than the bottom and supports the fixed terminal. The second surface of the fixed terminal is supported by the contact support portion of the contact housing. The heat dissipation space is arranged at a position adjacent to the accommodation space on the first direction side of the contact support portion, The thermally conductive member is disposed in contact with at least one of the contact housing and the yoke.

7. The electromagnetic relay according to claim 6, characterized in that: The heat dissipation structure further includes a vent that connects the heat dissipation space with the outside of the housing.

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