Contact devices and electromagnetic relays

Abstract

To improve heat dissipation performance of a contact device.SOLUTION: A contact device 10 includes fixed terminals (first fixed terminal 21 and second fixed terminal 22), a movable contactor 3, a metal spring 65, a resin member 64, and a holder member 60. The movable contactor 3 is configured to be capable of contacting and separating from the fixed terminals. The spring 65 is provided below the movable contactor 3. The resin member 64 is provided below the spring 65. The holder member 60 has a bottom part 62, and a part of the bottom part 62 is covered with the resin member 64. The holder member 60 has higher thermal conductivity than that of the resin member 64. The bottom part 62 of the holder member 60 has an exposed part 621 exposed from the resin member 64. The lower end of the spring 65 contacts the exposed part 621 of the bottom part 62.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates generally to a contact device and an electromagnetic relay, and more particularly to a contact device having a fixed terminal and an electromagnetic relay having the contact device. [Background technology]

[0002] The contact device described in Patent Document 1 has a fixed contact, a movable contactor, a spring receiving portion, and a contact pressure spring provided between the movable contactor and the spring receiving portion. The movable contactor comes into contact with and separates from the fixed contact. In the contact device of Patent Document 1, when the movable contactor is in contact with the fixed contact, the movable contactor and the fixed contact are electrically connected. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-117809 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a current flows through the movable contact and the fixed contact, the movable contact and the fixed contact generate heat.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide a contact device and an electromagnetic relay with improved heat dissipation performance. [Means for solving the problem]

[0006] In order to solve the above problems, a contact device according to one aspect of the present disclosure includes a fixed terminal, a movable contact, a metal spring, a resin member, a holder member, and York andThe movable contact is configured to be able to come into contact with and separate from the fixed terminal. The spring is provided below the movable contact. The resin member is provided below the spring. The holder member has a bottom, and a portion of the bottom is covered with the resin member. The yoke is provided above the movable contact. The holder member has a higher thermal conductivity than the resin member, the bottom of the holder member has an exposed portion exposed from the resin member, and a lower end of the spring is in contact with the exposed portion of the bottom. The weld marks between the yoke and the holder member are aligned along the edges of the yoke in the left-right direction. In order to solve the above problem, a contact device according to one aspect of the present disclosure includes a fixed terminal, a movable contactor, a metal spring, a resin member, a holder member, and a yoke. The movable contactor is configured to be movable in contact with and away from the fixed terminal. The spring is provided below the movable contactor. The resin member is provided below the spring. The holder member has a bottom, and a part of the bottom is covered by the resin member. The yoke is provided above the movable contactor. The holder member has a higher thermal conductivity than the resin member. The bottom of the holder member has an exposed portion exposed from the resin member. The lower end of the spring is in contact with the exposed portion of the bottom. The yoke is configured to move in the up-down direction together with the movable contactor. The yoke has a protruding portion protruding toward the movable contactor. In order to solve the above problem, a contact device according to an embodiment of the present disclosure includes a plurality of fixed terminals, a movable contactor, a metal spring, a resin member, a holder member, a first magnet, and a second magnet. The movable contactor is configured to be able to come into contact with and separate from the plurality of fixed terminals. The spring is provided below the movable contactor. The resin member is provided below the spring. The holder member has a bottom, and a part of the bottom is covered by the resin member. The holder member has a higher thermal conductivity than the resin member. The bottom of the holder member has an exposed portion exposed from the resin member. A lower end of the spring is in contact with the exposed portion of the bottom. The plurality of fixed terminals include a first fixed terminal and a second fixed terminal. The first fixed terminal has a first fixed contact. The second fixed terminal is located to the right of the first fixed terminal and has a second fixed contact. The movable contactor has a first movable contact and a second movable contact. The first movable contact is located below the first fixed contact. The second movable contact is located below the second fixed contact. The first magnet is located to the left front of the first movable contact. The second magnet is located to the right front of the second movable contact.

[0007] An electromagnetic relay according to an aspect of the present disclosure includes the contact device and an electromagnet device, the electromagnet device connecting and disconnecting the movable contactor to and from the fixed terminal. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a contact device and an electromagnetic relay with improved heat dissipation performance. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an overall perspective view of an electromagnetic relay according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is an exploded perspective view of the electromagnetic relay according to the above embodiment. [Figure 4] FIG. 4 is an exploded perspective view of a main part of the contact device according to the above embodiment. [Diagram 5] FIG. 5 is a perspective view of a holder member of the contact device according to the above embodiment. [Figure 6] FIG. 6 is a cross-sectional view of a main part of the contact device according to the above embodiment. [Figure 7] FIG. 7 is a bottom view of the yoke of the contact device according to the above. [Figure 8] FIG. 8 is a top view of a main part of the contact device according to the above embodiment. [Figure 9] FIG. 9 is a cross-sectional view taken along line BB in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, elements common to each other are given the same reference numerals, and duplicated descriptions of the common elements will be omitted. The following embodiment is merely one of various embodiments of the present disclosure. Various modifications of the embodiment are possible depending on the design, etc., as long as the object of the present disclosure can be achieved. Each figure described in this disclosure is a schematic diagram, and the ratio of the size and thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. Note that the arrows indicating each direction are merely examples, and are not intended to specify the direction when the electromagnetic relay 1 is used. Also, the arrows indicating each direction in the drawings are merely indicated for explanatory purposes, and do not have any substance.

[0011] (1) Overview First, an overview of an electromagnetic relay 1 according to this embodiment will be described with reference to Fig. 1, Fig. 2, Fig. 4, and Fig. 6. The electromagnetic relay 1 shown in Fig. 1 is provided in, for example, an electric vehicle. The electromagnetic relay 1 switches between the supply and non-supply of current from a power source of the electric vehicle to a motor.

[0012] As shown in FIG. 2, the electromagnetic relay 1 includes a contact device 10 and an electromagnet device 7. The contact device 10 includes a fixed terminal portion 2, a movable contactor 3, a holder member 60, a resin member 64, and a spring 65. The fixed terminal portion 2 includes a first fixed terminal 21 having a first fixed contact 211, and a second fixed terminal 22 having a second fixed contact 221. The movable contactor 3 includes a first movable contact 31 and a second movable contact 32. The movable contactor 3 is movable between a closed position where the first movable contact 31 contacts the first fixed contact 211 and the second movable contact 32 contacts the second fixed contact 221, and an open position where the first movable contact 31 and the second movable contact 32 are separated from the first fixed contact 211 and the second fixed contact 221.

[0013] 4, the holder member 60 has a bottom 62. The bottom 62 has an exposed portion 621 that is a portion exposed from the resin member 64. The spring 65 is disposed between the holder member 60 and the movable contact 3 in the vertical direction, and is in contact with the exposed portion 621 of the holder member 60 and the movable contact 3.

[0014] Here, the holder member 60 of this embodiment is formed of a metal such as SUS304. Therefore, the thermal conductivity of the holder member 60 is higher than that of the resin member 64. Since the lower end of the spring 65 contacts the exposed portion 621 of the holder member 60, the heat dissipation performance of the contact device 10 can be improved compared to, for example, a case in which the lower end of the spring 65 contacts only the resin member. Furthermore, since the exposed portion 621 of this embodiment is made of metal, the heat resistance and durability of the contact device 10 can be improved compared to a case in which the lower end of the spring 65 contacts only the resin member.

[0015] (2)Details Hereinafter, details of the electromagnetic relay 1 according to this embodiment will be described with reference to FIGS.

[0016] The direction perpendicular to both the left-right direction and the up-down direction is defined as the front-rear direction. However, in this disclosure, the "left-right direction" merely means the direction in which the first fixed terminal 21 and the second fixed terminal 22 are lined up. In this disclosure, the "up-down direction" merely means the direction in which the movable contact 3 moves. In this disclosure, the "front-rear direction" merely means the direction perpendicular to both the direction in which the first fixed terminal 21 and the second fixed terminal 22 are lined up and the direction in which the movable contact 3 moves. The terms "left-right direction," "up-down direction," and "front-rear direction" in this disclosure are not intended to limit the direction in which the contact device 10 and the electromagnetic relay 1 are used.

[0017] In addition, the direction from first fixed contact 211 to first movable contact 31 is defined as "downward", and the direction from first movable contact 31 to first fixed contact 211 is defined as "upward". The direction from first fixed terminal 21 to second fixed terminal 22 is defined as "rightward", and the direction from second fixed terminal 22 to first fixed terminal 21 is defined as "leftward".

[0018] Arrows indicating left and right, up and down, front and back in the drawings are merely shown for the purpose of explanation and have no substance.

[0019] (2.1) Components of an electromagnetic relay As shown in FIG. 2, the electromagnetic relay 1 of this embodiment includes a contact device 10 and an electromagnet device 7. The electromagnet device 7 brings the movable contactor 3 into contact with and separates it from the fixed terminal portion 2. More specifically, the electromagnet device 7 performs at least one of the following operations: switching the position of the movable contactor 3 to a closed position and switching the position of the movable contactor 3 to an open position. The electromagnet device 7 of this embodiment includes a coil 71, and when the coil 71 is energized, for example, the electromagnetic action of the coil 71 switches the position of the movable contactor 3 from the open position to the closed position. The electromagnet device 7 also includes a return spring 75, and when the coil 71 is de-energized, the spring force of the return spring 75 switches the position of the movable contactor 3 from the closed position to the open position.

[0020] The electromagnetic relay 1 further includes a housing 8. The housing 8 accommodates the contact device 10 and the electromagnet device 7.

[0021] The housing 8 has a first body 81 and a second body 82. The first body 81 is formed in a box shape with an opening on the bottom surface. The second body 82 is formed in a box shape with an opening on the top surface. The first body 81 and the second body 82 are joined at the periphery of each opening.

[0022] (2.2) Components of Contact Device As shown in FIG. 2, the contact device 10 includes a fixed terminal portion 2, a movable contactor 3, a magnetic shield 4, a case 51, a connecting body 52, two permanent magnets 53, two bridging portions 54, a shielding member 55, a holder member 60, a yoke 61, a resin member 64, and a spring 65.

[0023] (2.3) Fixed terminal section As described above, the fixed terminal portion 2 has the first fixed terminal 21 and the second fixed terminal 22. The first fixed terminal 21 and the second fixed terminal 22 are aligned in the left-right direction, and the second fixed terminal 22 is located to the right of the first fixed terminal 21. The first fixed terminal 21 and the second fixed terminal 22 are formed of a conductive material such as copper. The first fixed terminal 21 and the second fixed terminal 22 are disposed to penetrate the first body 81 and the case 51. The first fixed terminal 21 and the second fixed terminal 22 are joined to the case 51 by brazing with their upper ends protruding from the upper surface of the case 51 and the upper surface of the first body 81.

[0024] First fixed terminal 21 has a cylindrical shape having a lower surface. First fixed contact 211 is formed at the lower end of first fixed terminal 21. Note that first fixed contact 211 may be attached to the lower end of first fixed terminal 21. Second fixed terminal 22 has a cylindrical shape having a lower surface. Second fixed contact 221 is formed at the lower end of second fixed terminal 22. Note that second fixed contact 221 may be attached to the lower end of second fixed terminal 22.

[0025] (2.4) Movable Contact The movable contactor 3 is formed of a conductive material such as copper. The movable contactor 3 is also formed of a non-magnetic material. As shown in FIG. 4, the movable contactor 3 has a movable contactor body 30, a first movable contact 31, a second movable contact 32, and a central portion 33. The movable contactor body 30 is formed in a flat plate shape. The thickness direction of the movable contactor body 30 is along the up-down direction. The longitudinal direction of the movable contactor body 30 is along the left-right direction.

[0026] The first movable contact 31 is formed on the left end of the upper surface of the movable contactor body 30. That is, the first movable contact 31 in this embodiment is a part of the upper surface of the movable contactor body 30. The first movable contact 31 may be attached to the left end of the upper surface of the movable contactor body 30. The first movable contact 31 faces the first fixed contact 211 in the up-down direction. More specifically, the first movable contact 31 is located below the first fixed contact 211 (see FIG. 2).

[0027] The second movable contact 32 is formed on the right end of the upper surface of the movable contactor body 30. That is, the second movable contact 32 in this embodiment is a part of the upper surface of the movable contactor body 30. The second movable contact 32 may be attached to the right end of the upper surface of the movable contactor body 30. The second movable contact 32 faces the second fixed contact 221 in the up-down direction. More specifically, the second movable contact 32 is located below the second fixed contact 221 (see FIG. 2).

[0028] The central portion 33 is the center and the peripheral portion of the center in the front-rear and left-right directions of the upper surface of the movable contact body 30. The central portion 33 is, for example, a portion of the upper surface of the movable contact body 30 surrounded by a dashed line shown in FIG.

[0029] When the movable contactor 3 is in the open position, the first fixed terminal 21 and the second fixed terminal 22 are not electrically connected. When the movable contactor 3 is in the closed position (see FIG. 2), the first fixed terminal 21 and the second fixed terminal 22 are electrically connected via the movable contactor 3.

[0030] 2, the movable contactor 3 further has a first protrusion 34 and a second protrusion 35 protruding from the lower surface of the movable contactor body 30. The first protrusion 34 and the second protrusion 35 are aligned in the left-right direction, and the second protrusion 35 is located to the right of the first protrusion 34.

[0031] (2.5) Magnetic Shielding The magnetic shield 4 is formed of a magnetic material such as electromagnetic soft iron or SPCC (Steel Plate Cold Commercial). The magnetic permeability of the magnetic shield 4 is higher than that of the movable contact 3.

[0032] As shown in FIG. 4, the magnetic shield 4 has a first shield part 41, a second shield part 42, and two connecting parts 43. The first shield part 41 and the second shield part 42 are aligned in the left-right direction, and the second shield part 42 is located to the right of the first shield part 41. The first shield part 41 is in the form of a rectangular plate. The left end of the first shield part 41 is bent downward. The second shield part 42 is in the form of a rectangular plate. The right end of the second shield part 42 is bent downward.

[0033] The first shield part 41 is disposed below the first movable contact 31. The second shield part 42 is disposed below the second movable contact 32. The first shield part 41 has a fitting hole 44. The second shield part 42 has a fitting hole 45. The first protrusion 34 (see FIG. 2) of the movable contactor 3 is inserted into the fitting hole 44, and the second protrusion 35 (see FIG. 2) of the movable contactor 3 is inserted into the fitting hole 45, whereby the magnetic shield 4 is coupled to the movable contactor 3.

[0034] The magnetic shield 4 is in contact with the movable contactor 3. More specifically, the upper surface of the first shield part 41 and the upper surface of the second shield part 42 are in contact with the lower surface of the movable contactor body 30.

[0035] The two connecting parts 43 face each other in the front-rear direction. The two connecting parts 43 have a length in the left-right direction. The left ends of the two connecting parts 43 are connected to the first shield part 41, and the right ends of the two connecting parts 43 are connected to the second shield part 42. One of the two connecting parts 43 is provided to protrude upward from the front end part of the first shield part 41 and the front end part of the second shield part 42. The other of the two connecting parts 43 is provided to protrude upward from the rear end part of the first shield part 41 and the rear end part of the second shield part 42.

[0036] The magnetic shield 4 has a through hole 46. The through hole 46 is provided between the first shield part 41 and the second shield part 42. A spring 65, which will be described later, is passed through the through hole 46.

[0037] (2.6) Holder parts As shown in FIG. 5, the holder member 60 has a bottom portion 62 and a pair of side plates 63.

[0038] The bottom 62 is a rectangular plate. The bottom 62 has an exposed portion 621. The exposed portion 621 is a portion exposed from the resin member 64 when the upper surface of the bottom 62 is covered with the resin member 64 (see FIG. 6). The exposed portion 621 is, for example, an annular portion sandwiched between the two-dot chain line L1 and the two-dot chain line L2 in FIG. 5. The bottom 62 also has a first hole 622 and a plurality of (six in the example of FIG. 5) second holes 623. The first hole 622 is a round hole formed in the center of the bottom 62 in the front-rear and left-right directions. The six second holes 623 are round holes formed on a circumference centered on the first hole 622. The first hole 622 and the six second holes 623 are holes that are blocked by the resin member 64.

[0039] One of the pair of side plates 63 protrudes upward from the left and right parts of the front end of the bottom portion 62, and the other of the pair of side plates 63 protrudes upward from the left and right parts of the rear end of the bottom portion 62. The upper ends of the pair of side plates 63 are located above the upper surface of the movable contact 3 (see FIG. 2). The upper ends of the pair of side plates 63 are welded to the yoke 61 (see FIG. 2).

[0040] The holder member 60 of this embodiment is formed of a non-magnetic metal material. The non-magnetic metal material is, for example, austenitic stainless steel such as SUS304, or aluminum. Metal materials generally have higher thermal conductivity than resin, so the heat dissipation performance of the exposed portion 621 can be improved.

[0041] Moreover, the holder member 60 is formed from a single member. More specifically, the bottom 62 and the pair of side plates 63 are formed by bending a single sheet of non-magnetic metal material. By forming the holder member 60 from a single member, heat can be easily dissipated from the bottom 62 to the pair of side plates 63. In other words, by forming the holder member 60 from a single member, the heat dissipation performance of the exposed portion 621 can be improved.

[0042] (2.7) Plastic parts Next, the resin member 64 will be described with reference to Fig. 4 and Fig. 6. The resin member 64 is formed of, for example, synthetic resin. As shown in Fig. 4, the resin member 64 is formed integrally with the holder member 60 so as to cover a part of the upper surface and the lower surface of the bottom portion 62 of the holder member 60. The resin member 64 holds the holder member 60. As shown in Fig. 6, the resin member 64 has a base portion 640, a first protruding portion 641, a second protruding portion 642, and a connecting portion 643.

[0043] The base portion 640 has a cylindrical shape having an upper surface. The coupling portion 643 protrudes downward from the periphery of the center in the front-rear and left-right directions of the base portion 640. The coupling portion 643 has a cylindrical shape and is coupled to the shaft 78 (see FIG. 2).

[0044] The first protrusion 641 protrudes upward from the center of the base 640 in the front-rear and left-right directions, and protrudes upward from the upper surface of the bottom 62 through the first hole 622 of the bottom 62. In a plan view from above, the first protrusion 641 spreads in a circular shape so as to cover a part of the upper surface of the bottom 62. As shown in FIG. 6, the cross-sectional shape of the first protrusion 641 is T-shaped. In addition, the first protrusion 641 is surrounded by the spring 65 in a plan view from above. In other words, the first protrusion 641 is surrounded by the spring 65 in the front-rear and left-right directions. In other words, the first protrusion 641 is located in a hollow portion of the spring 65.

[0045] The second protrusions 642 protrude upward from the base 640 , pass through the six second holes 623 (see FIG. 5) of the bottom 62 and around the periphery of the bottom 62 , and protrude upward from the upper surface of the bottom 62 .

[0046] 4, in a plan view from above, the second protruding portion 642 has a ring-shaped shape with a circular inner periphery. The inner periphery of the second protruding portion 642 is concentric with the outer periphery of the first protruding portion 641, and the diameter of the inner periphery of the second protruding portion 642 is larger than the diameter of the outer periphery of the first protruding portion 641. Between the outer periphery of the first protruding portion 641 and the inner periphery of the second protruding portion 642, the exposed portion 621 of the bottom portion 62 is exposed, and the exposed portion 621 is ring-shaped.

[0047] (2.8) Springs The spring 65 is, for example, a compression coil spring made of metal. The spring 65 is provided below the movable contactor 3 and above the resin member 64. The spring 65 is passed through the through hole 46 of the magnetic shield 4. The spring 65 is disposed between the exposed portion 621 of the bottom portion 62 and the movable contactor 3 with the expansion and contraction direction facing the up-down direction. More specifically, the lower end of the spring 65 contacts the exposed portion 621 of the bottom portion 62, and the upper end of the spring 65 contacts the movable contactor 3. The movable contactor 3 is sandwiched between the spring 65 and the yoke 61. The spring 65 functions as a contact pressure spring that applies an upward spring force to the movable contactor 3.

[0048] (2.9) York The yoke 61 is made of a magnetic material. Examples of the magnetic material include soft magnetic iron and SPCC (Steel Plate Cold Commercial). The shape of the yoke 61 is a rectangular parallelepiped. The yoke 61 has a protrusion 611 (see FIG. 7) and a recess 612. The recess 612 is formed in the center in the front-rear and left-right directions on the upper surface of the yoke 61, and is recessed downward. In a plan view from above, the shape of the recess 612 is circular.

[0049] As shown in FIG. 7, the protrusion 611 is formed so as to protrude downward from the center in the front-rear and left-right directions on the lower surface of the yoke 61. In a plan view from below, the shape of the protrusion 611 is circular. In the vertical direction, at least a part of the protrusion 611 overlaps with the recess 612. In addition, in the vertical direction, at least a part of the protrusion 611 overlaps with the shaft 78 (see FIG. 2). In addition, the protrusion 611 faces the center 33 of the movable contact 3 (see FIG. 4). In this embodiment, the lower surface of the protrusion 611 and the upper surface (center 33) of the movable contact 3 are parallel to each other.

[0050] The protrusion 611 of this embodiment comes into contact with the central portion 33 (see FIG. 4) of the movable contactor 3 when the yoke 61 and the movable contactor 3 move downward. In a conventional contact device, when the yoke and the movable contactor move downward, the left or right end of the lower surface of the yoke comes into contact with the movable contactor, which may cause the movable contactor to swing. Here, "swing" includes the first movable contact moving upward relative to the second movable contact, or the first movable contact moving downward relative to the second movable contact. In the contact device 10 of this embodiment, when the movable contactor 3 moves downward, the protrusion 611 of the yoke 61 comes into contact with the central portion 33 of the movable contactor 3, thereby reducing the swing of the movable contactor 3.

[0051] As described above, the yoke 61 is welded to the upper ends of the pair of side plates 63 of the holder member 60. The yoke 61 is located above the upper surface of the movable contact 3. As shown in Fig. 8, there are two weld marks A1 and A2 between the yoke 61 and the pair of side plates 63. The weld mark A1 located at the rear end of the yoke 61 runs along the edge of the upper end of the yoke 61 in the left-right direction. The weld mark A2 located at the front end of the yoke 61 runs along the edge of the lower end of the yoke 61 in the left-right direction.

[0052] 2, the yoke 61 is located above the upper surface of the movable contact 3. When a current flows between the movable contact 3 and the first fixed contact 211 and the second fixed contact 221 (see FIG. 2) when they are in contact with each other, an electromagnetic repulsive force acts between the movable contact 3 and the first fixed contact 211 and the second fixed contact 221 due to this current.

[0053] Therefore, the yoke 61 faces two connecting parts 43 (see FIG. 4) of the magnetic shield 4. As a result, the yoke 61 and the magnetic shield 4 form a magnetic circuit surrounding the movable contact 3. When a current flows between the first movable contact 31 and the second movable contact 32 and the first fixed contact 211 and the second fixed contact 221 when they are in contact with each other, an attractive force due to a magnetic force is generated between the yoke 61 and the magnetic shield 4. This restricts the movable contact 3 from moving away from the first fixed contact 211 and the second fixed contact 221. Therefore, the possibility of an arc being generated between the movable contact 3 and the first fixed contact 211 and the second fixed contact 221 can be reduced.

[0054] (2.10) Case Next, the case 51 will be described with reference to FIG. 2. The material of the case 51 is a heat-resistant material such as ceramic. The shape of the case 51 is a box-like shape with an open bottom. The space inside the case 51 is an accommodation chamber 510 that accommodates the first fixed contact 211, the second fixed contact 221, and the movable contact 3. That is, the contact device 10 includes the accommodation chamber 510. An arc-extinguishing gas such as hydrogen is sealed in the accommodation chamber 510. The accommodation chamber 510 does not need to be sealed, and may be connected to the external environment.

[0055] (2.11) Concatenation The connector 52 has a rectangular frame shape. The connector 52 is joined to the case 51 by brazing. Furthermore, the connector 52 is joined to a yoke 74 provided in the electromagnet device 7 by welding. In this way, the connector 52 connects the case 51 and the yoke 74 together.

[0056] (2.12) Two permanent magnets 2 and 3, the two permanent magnets 53 are disposed and fixed between the outer surface of the case 51 and the inner surface of the housing 8. The two permanent magnets 53 are lined up in the left-right direction. One of the two permanent magnets 53 (a first magnet) is disposed to the left front of the first movable contact 31. The other of the two permanent magnets 53 (a second magnet) is disposed to the right front of the second movable contact 32. The two permanent magnets 53 overlap at least a portion of the magnetic shield 4 in the left-right direction.

[0057] The two permanent magnets 53 have opposite poles facing each other. For example, the left permanent magnet 53 (first magnet) has its N pole facing right, and the right permanent magnet 53 (second magnet) has its S pole facing left. The two permanent magnets 53 apply a magnetic field along the left-right direction to a space sandwiched between the two permanent magnets 53 in the left-right direction. The magnetic field is also distributed around the movable contactor 3 (for example, in front of the movable contactor 3).

[0058] (2.13) Two bridges Next, the two bridge parts 54 will be described with reference to FIG. 2 and FIG. 3. The two bridge parts 54 are made of a magnetic material. When viewed from the top-bottom direction, each bridge part 54 has a U-shape. One of the two bridge parts 54 is disposed in front of the movable contact 3, and the other is disposed behind the movable contact 3. In addition, one of the two bridge parts 54 faces each of the two permanent magnets 53 in the left-right direction. The two bridge parts 54 are disposed so as to bridge between the two permanent magnets 53. Furthermore, one of the two bridge parts 54 holds the two permanent magnets 53. The two bridge parts 54 form a ring-shaped magnetic circuit together with the two permanent magnets 53.

[0059] (2.14) Shielding materials The shielding member 55 has an electrical insulating property. The material of the shielding member 55 is, for example, ceramic or synthetic resin. The shielding member 55 is accommodated in the accommodation chamber 510 of the case 51.

[0060] In the contact device 10, when the movable contactor 3 moves from the closed position to the open position, an arc may occur between the first movable contact 31 and the first fixed contact 211, and between the second movable contact 32 and the second fixed contact 221. The shielding member 55 is disposed to limit the range over which the arc extends.

[0061] (2.15) Electromagnetic device 2, the electromagnetic device 7 includes a coil 71, a coil bobbin 72, a movable core 73, a yoke 74, a return spring 75, a cylindrical member 76, and a bush 77. The electromagnetic device 7 also includes a pair of coil terminals T1 (see FIG. 3) to which both ends of the coil 71 are connected. Each of the coil terminals T1 is made of a conductive material such as copper.

[0062] The coil bobbin 72 is formed of, for example, a synthetic resin. The coil bobbin 72 has a first flange portion 721, a second flange portion 722, and a cylindrical portion 723. The coil 71 is wound around the cylindrical portion 723. The first flange portion 721 extends outward in the radial direction of the cylindrical portion 723 from an upper end of the cylindrical portion 723. The second flange portion 722 extends outward in the radial direction of the cylindrical portion 723 from a lower end of the cylindrical portion 723.

[0063] The cylindrical member 76 has a cylindrical shape having a lower surface. The cylindrical member 76 is housed in the cylindrical portion 723 of the coil bobbin 72.

[0064] The movable core 73 is made of a magnetic material. The movable core 73 has a cylindrical shape. The movable core 73 is housed in a cylindrical member 76. A shaft 78 passes through the inside of the movable core 73, and the movable core 73 and the shaft 78 are connected to each other. The movable core 73 has a recess 731 recessed downward from its upper surface.

[0065] The yoke 74 forms at least a part of a magnetic circuit through which magnetic flux generated in the coil 71 passes when the coil 71 is energized. The yoke 74 includes a first yoke 741, a second yoke 742, and two third yokes 743. The first yoke 741, the second yoke 742, and the two third yokes 743 are each formed in a plate shape.

[0066] The first yoke 741 is disposed between the movable contact 3 and the coil 71 in the up-down direction. The first yoke 741 is in contact with the upper surface of the first flange portion 721 of the coil bobbin 72. The first yoke 741 has a rectangular plate shape. An insertion hole 744 is formed in the center of the first yoke 741. The shaft 78 passes through the insertion hole 744.

[0067] The second yoke 742 is in contact with the lower surface of the second flange portion 722 of the coil bobbin 72. One of the two third yokes 743 extends from the left end of the second yoke 742 to the first yoke 741. The other of the two third yokes 743 extends from the right end of the second yoke 742 to the first yoke 741.

[0068] The return spring 75 is, for example, a compression coil spring. A first end of the return spring 75 in the expansion / contraction direction (vertical direction) contacts the first yoke 741, and a second end contacts the bottom surface of the recess 731 of the movable core 73. The return spring 75 applies a spring force to the movable core 73 to move the movable core 73 downward.

[0069] The shaft 78 is shaped like a round bar. The axial direction of the shaft 78 is along the vertical direction. The upper end of the shaft 78 is connected to a connecting portion 643 (see FIG. 6) of the resin member 64. The lower end of the shaft 78 is connected to the movable core 73. When the movable core 73 moves in the vertical direction, the shaft 78, the resin member 64, the holder member 60, the movable contactor 3 held by the holder member 60, and the yoke 61 move in the vertical direction together. That is, the shaft 78 moves the movable contactor 3 toward and away from the first fixed contact 211 and the second fixed contact 221.

[0070] The bush 77 is made of a magnetic material. The bush 77 has a cylindrical shape. The bush 77 is disposed between the inner peripheral surface of the coil bobbin 72 and the outer peripheral surface of the cylindrical member 76. The bush 77, together with the movable core 73 and the yoke 74, forms a magnetic circuit through which magnetic flux generated when the coil 71 is energized passes.

[0071] When the coil 71 is energized, the magnetic flux generated by the coil 71 passes through the magnetic circuit, so that the movable core 73 moves so as to reduce the magnetic resistance of the magnetic circuit. Specifically, when the coil 71 is energized, the movable core 73 moves upward so as to fill the gap between the first yoke 741 and the movable core 73. More specifically, the electromagnetic force that tries to move the movable core 73 upward exceeds the force (spring force) of the return spring 75 that pushes the movable core 73 downward, so that the movable core 73 moves upward. Accordingly, the shaft 78, the holder member 60, and the movable contactor 3 move upward. Therefore, the movable contactor 3 moves to the closed position. The spring force of the spring 65 ensures the contact pressure between the movable contactor 3 and the first fixed contact 211 and the second fixed contact 221.

[0072] When the coil 71 changes from a current-carrying state to a current-de-carrying state, the electromagnetic force that moves the movable core 73 upward disappears, and the movable core 73 moves downward due to the spring force of the return spring 75. Accordingly, the shaft 78, the holder member 60, and the movable contactor 3 move downward. Therefore, the movable contactor 3 moves to the open position.

[0073] (2.16) Arc Behavior When the movable contactor 3 moves from the closed position to the open position, an arc may occur between the first movable contact 31 and the first fixed contact 211, and between the second movable contact 32 and the second fixed contact 221.

[0074] As shown in FIG. 9, the width of the two permanent magnets 53 in the front-rear direction is less than half the width of the outer shape of the case 51. The rear ends of the two permanent magnets 53 are located forward of the center of the front-rear direction of the case 51 (movable contactor 3). The two permanent magnets 53 apply a magnetic field along the left-right direction to the space in front of the movable contactor 3 and its periphery. The arc generated between the first movable contact 31 and the first fixed contact 211 is extended, for example, in the direction of the arrow A3 (left rear) by the Lorentz force. The arc generated between the second movable contact 32 and the second fixed contact 221 is extended, for example, in the direction of the arrow A4 (right front) by the Lorentz force. By arranging the first magnet 531 to the left front of the first movable contact 31 and the second magnet 532 to the right front of the second movable contact 32, the arc can be extended in an oblique direction in the front-rear-left and right directions as shown in FIG. 9. In other words, by positioning the first magnet 531 to the front and left of the first movable contact 31 and the second magnet 532 to the front and right of the second movable contact 32, the arc can be extended longer than when the arc is extended in the front-to-back or left-to-right direction, thereby improving the arc-extinguishing performance.

[0075] (3) Effects As described above, the electromagnetic relay 1 of the present embodiment includes the contact device 10 and the electromagnet device 7. The contact device 10 includes the fixed terminal portion 2 (first fixed terminal 21; second fixed terminal 22), the movable contactor 3, the spring 65, the resin member 64, and the holder member 60. The upper end of the spring 65 contacts the movable contactor 3, and the lower end of the spring 65 contacts the exposed portion 621 of the holder member 60. The holder member 60 has a higher thermal conductivity than the resin member 64. In addition, the electromagnet device 7 moves the movable contactor 3 toward and away from the fixed terminal portion 2. For example, the heat dissipation performance of the contact device 10 can be improved compared to a case in which the lower end of the spring 65 contacts only the resin member 64.

[0076] Moreover, the holder member 60 is made of metal. Generally, metal has a higher thermal conductivity than resin or the like, and therefore the heat dissipation performance of the contact device 10 can be further improved. Moreover, compared to when the holder member 60 is made of resin, for example, the heat resistance and durability of the holder member 60 can be improved.

[0077] Moreover, the spring 65 is a coil spring, and the shape of the exposed portion 621 is annular. By matching the shapes of the spring 65 and the exposed portion 621, the contact area between the spring 65 and the exposed portion 621 is increased, and heat can be easily released from the spring 65 to the exposed portion 621.

[0078] Moreover, the resin member 64 has a base portion 640 and a first protruding portion 641. The first protruding portion 641 protrudes upward from the base portion 640. The first protruding portion 641 is located in a hollow portion of the spring 65. Since the first protruding portion 641 is located in the hollow portion of the spring 65, the occurrence of misalignment of the spring 65 can be reduced.

[0079] The contact device 10 also includes a yoke 61. The yoke 61 is provided above the movable contactor 3. Two weld marks A1 and A2 between the yoke 61 and the holder member 60 are along the edge of the yoke 61 in the left-right direction. Since the yoke 61 and the holder member 60 are welded along the edge of the yoke 61, the joining strength between the yoke 61 and the holder member 60 can be improved compared to, for example, a case where the yoke 61 and the holder member 60 are locally welded.

[0080] Moreover, the holder member 60 is formed of a single member. Compared to a case in which the bottom 62 is formed of, for example, two bottom plates, the contact area between the spring 65 and the bottom 62 is larger, and heat can be more easily released from the spring 65 to the bottom 62.

[0081] Moreover, the yoke 61 is configured to move in the up-down direction together with the movable contactor 3. The yoke 61 has a protrusion 611. The protrusion 611 protrudes toward the movable contactor 3. For example, when the yoke 61 moves downward, the protrusion 611 first comes into contact with the movable contactor 3, so that it is possible to reduce the shaking of the movable contactor 3 caused by the corners of the yoke 61 coming into contact with the movable contactor 3.

[0082] Moreover, the movable contactor 3 moves upward to come into contact with the fixed terminal portion 2, and moves downward to move away from the fixed terminal portion 2. The protrusion 611 of the yoke 61 comes into contact with the movable contactor 3 when the movable contactor 3 moves downward. Since the protrusion 611 comes into contact with the movable contactor 3 first when the yoke 61 moves downward, it is possible to reduce the swinging of the movable contactor 3 caused by the corners of the yoke 61 coming into contact with the movable contactor 3.

[0083] The contact device 10 also includes a shaft 78 (movable shaft). The shaft 78 moves the movable contactor 3 in contact with and away from the fixed terminal portion 2. At least a portion of the protruding portion 611 of the yoke 61 overlaps with the movable shaft in the vertical direction. The center of gravity of the movable contactor 3 is generally located at a portion where the shaft 78 and the movable contactor 3 overlap in the vertical direction. For example, when the yoke 61 and the movable contactor 3 move downward, the protruding portion 611 of the yoke 61 first comes into contact with the vicinity of the center of gravity of the movable contactor 3, so that the swing of the movable contactor 3 can be further reduced.

[0084] The contact device 10 also includes two permanent magnets 53 (a first magnet 531 and a second magnet 532). The fixed terminal portion 2 also includes a first fixed terminal 21 and a second fixed terminal 22. The first fixed terminal 21 includes a first fixed contact 211. The second fixed terminal 22 is located to the right of the first fixed terminal 21 and includes a second fixed contact 221. The movable contactor 3 also includes a first movable contact 31 and a second movable contact 32. The first movable contact 31 is located below the first fixed contact 211. The second movable contact 32 is located below the second fixed contact 221. The first magnet 531 is located to the left front of the first movable contact 31. The second magnet 532 is located to the right front of the second movable contact 32. The arc that may occur when the first fixed contact 211 and the second fixed contact 221 separate from the first movable contact 31 and the second movable contact 32 can be extended diagonally in the front-back and left-right directions, thereby improving the arc-extinguishing performance.

[0085] (4) Variations The above embodiment is merely one of various embodiments of the present disclosure. The above embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved.

[0086] The holder member 60 may be formed of a highly thermally conductive resin having a higher thermal conductivity than the resin member 64 .

[0087] Moreover, it is not essential that the holder member 60 is formed from a single member. For example, the bottom portion 62 may be formed from metal, and the pair of side plates 63 may be formed from resin.

[0088] In addition, it is not essential that the holder member 60 is integrally formed. For example, the holder member 60 may be a pair of holder members obtained by dividing the center of the holder member 60 in the front-rear direction into two along the left-right direction. In addition, the holder member 60 may be a pair of holder members obtained by dividing the center of the holder member 60 in the left-right direction into two along the front-rear direction.

[0089] The two permanent magnets 53 may be located behind the movable contactor 3. That is, one of the two permanent magnets 53 (first magnet 531) may be located to the left rear of the first movable contact 31. Also, the other of the two permanent magnets 53 (second magnet 532) may be located to the right rear of the second movable contact 32.

[0090] The number of permanent magnets 53 is not limited to two, but may be one, or three or more.

[0091] (summary) As described above, the contact device (10) according to the first aspect includes the fixed terminals (first fixed terminal 21; second fixed terminal 22), the movable contactor (3), the metal spring (65), the resin member (64), and the holder member (60). The movable contactor (3) is configured to be able to come into contact with and separate from the fixed terminals. The spring (65) is provided below the movable contactor (3). The resin member (64) is provided below the spring (65). The holder member (60) has a bottom (62), and a portion of the bottom (62) is covered with the resin member (64). The holder member (60) has a higher thermal conductivity than the resin member (64). The bottom (62) of the holder member (60) has an exposed portion (621) exposed from the resin member (64). The lower end of the spring (65) is in contact with the exposed portion (621) of the bottom portion (62).

[0092] According to this embodiment, for example, the heat dissipation performance of the contact device (10) can be improved as compared to a case in which the lower end of the spring (65) is in contact only with the resin member (64).

[0093] In the contact device (10) according to the second aspect, in the first aspect, the holder member (60) is made of metal.

[0094] According to this embodiment, since metal generally has a higher thermal conductivity than resin and the like, it is possible to further improve the heat dissipation performance of the contact device 10. Also, compared to a case where the holder member 60 is made of resin, for example, it is possible to improve the heat resistance and durability of the holder member 60.

[0095] In the contact device (10) according to the third aspect, in the first or second aspect, the spring (65) is a coil spring. The exposed portion (621) has an annular shape.

[0096] According to this embodiment, the contact area between the coil spring (spring 65) and the exposed portion (621) is increased, and heat can be easily released from the coil spring (65) to the exposed portion (621).

[0097] In the contact device (10) according to the fourth aspect, in any one of the first to third aspects, the spring (65) is a coil spring. The resin member (64) has a base (640) and a protruding portion (first protruding portion 641). The protruding portion protrudes upward from the base (640). The protruding portion is located in a hollow portion of the coil spring.

[0098] According to this embodiment, since the protruding portion (first protruding portion 641) is located in the hollow portion of the coil spring (spring 65), it is possible to reduce the occurrence of positional deviation of the coil spring.

[0099] The contact device (10) according to a fifth aspect is any one of the first to fourth aspects, further including a yoke (61). The yoke (61) is provided above the movable contact (3). Welding marks (A1; A2) between the yoke (61) and the holder member (60) are aligned along edges of the yoke (61) in the left-right direction.

[0100] According to this embodiment, the yoke (61) and the holder member (60) are welded together along the edge of the yoke (61), thereby improving the joining strength between the yoke (61) and the holder member (60).

[0101] In the contact device (10) according to a sixth aspect, in any one of the first to fifth aspects, the holder member (60) is formed of a single member.

[0102] According to this embodiment, the contact area between the spring (65) and the bottom (62) is larger than when the bottom (62) is formed, for example, from two bottom plates, making it easier for heat to escape from the spring (65) to the bottom (62).

[0103] The contact device (10) according to a seventh aspect is any of the first to sixth aspects, and further includes a yoke (61). The yoke (61) is provided above the movable contactor (3). The yoke (61) is configured to move in the up-down direction together with the movable contactor (3). The yoke (61) has a protrusion (611). The protrusion (611) protrudes toward the movable contactor (3).

[0104] According to this embodiment, for example, when the yoke (61) moves downward, the protrusion (611) first comes into contact with the movable contact (3), thereby reducing the shaking of the movable contact caused by the corner of the yoke coming into contact with the movable contact.

[0105] In the contact device (10) according to the eighth aspect, in the seventh aspect, the fixed terminals (first fixed terminal 21; second fixed terminal 22) are provided above the movable contactor (3). The movable contactor (3) moves upward to contact the fixed terminals and moves downward to move away from the fixed terminals. The protrusion (611) of the yoke (61) comes into contact with the movable contactor (3) when the movable contactor (3) moves downward.

[0106] According to this embodiment, when the yoke (61) moves downward, the protrusion (611) first comes into contact with the movable contact (3), thereby reducing the shaking of the movable contact caused by the corner of the yoke coming into contact with the movable contact.

[0107] The contact device (10) according to the ninth aspect is the contact device (10) of the seventh or eighth aspect, further including a movable shaft (shaft 78). The movable shaft moves the movable contactor (3) in contact with and away from the fixed terminals (first fixed terminal 21; second fixed terminal 22). At least a portion of the protruding portion (611) of the yoke (61) overlaps with the movable shaft in the up-down direction.

[0108] According to this embodiment, at least a portion of the protruding portion (611) overlaps with the movable axis (shaft 78), so that the shaking of the movable contact (3) can be further reduced.

[0109] The contact device (10) according to the tenth aspect is in any one of the first to ninth aspects, and further includes a first magnet (531) and a second magnet (532). The contact device (10) includes a plurality of fixed terminals. The plurality of fixed terminals includes a first fixed terminal (21) and a second fixed terminal (22). The first fixed terminal (21) has a first fixed contact (211). The second fixed terminal (22) is located to the right of the first fixed terminal (21) and has a second fixed contact (221). The movable contactor (3) has a first movable contact (31) and a second movable contact (32). The first movable contact (31) is located below the first fixed contact (211). The second movable contact (32) is located below the second fixed contact (221). The first magnet (531) is located to the left front of the first movable contact (31). The second magnet (532) is located to the right and in front of the second movable contact (32).

[0110] According to this embodiment, the arc that may occur when the first fixed contact (211) and the second fixed contact (221) separate from the first movable contact (31) and the second movable contact (32) is extended in an oblique direction in the front-rear and left-right directions, thereby improving the arc-extinguishing performance.

[0111] The configurations other than those of the first aspect are not essential to the contact device (10) and may be omitted as appropriate.

[0112] An electromagnetic relay (1) according to an eleventh aspect includes the contact device (10) according to any one of the first to tenth aspects and an electromagnet device (7). The electromagnet device (7) connects and disconnects the movable contact (3) to and from fixed terminals (first fixed terminal 21; second fixed terminal 22).

[0113] According to this embodiment, the heat dissipation performance of the contact device (10) can be improved as compared to a case in which, for example, the lower end of the spring (65) is in contact only with the resin member (64). [Explanation of symbols]

[0114] 1 Electromagnetic relay 10 Contact device 21 1st fixed terminal (fixed terminal) 211 1st fixed contact 22 2nd fixed terminal (fixed terminal) 221 2nd fixed contact 3 Movable Contact 31 1st movable contact 32 2nd movable contact 531 First Magnet 532 Second Magnet 60 Holder member 61 York 611 Protrusion 62 Bottom 621 Exposed part 64 Resin parts 641 1st protrusion (protrusion) 65 Spring 7 Electromagnetic device 78 Shaft (movable shaft) A1, A2 Welding marks

Claims

1. A fixed terminal; A movable contactor configured to be capable of being brought into contact with and separated from the fixed terminal; A metal spring provided below the movable contact; A resin member provided below the spring; a holder member having a bottom, a portion of the bottom being covered with the resin member; A yoke provided above the movable contact; Equipped with the holder member has a higher thermal conductivity than the resin member, the bottom of the holder member has an exposed portion exposed from the resin member, a lower end of the spring contacting the exposed portion of the base; The welding marks between the yoke and the holder member are aligned along the edge of the yoke in the left-right direction. Contact device.

2. A fixed terminal; A movable contactor configured to be capable of being brought into contact with and separated from the fixed terminal; A metal spring provided below the movable contact; A resin member provided below the spring; a holder member having a bottom, a portion of the bottom being covered with the resin member; A yoke provided above the movable contact; Equipped with the holder member has a higher thermal conductivity than the resin member, the bottom of the holder member has an exposed portion exposed from the resin member, a lower end of the spring contacting the exposed portion of the base; The yoke is The movable contact is configured to move in the up and down direction together with the movable contact, A protrusion protruding toward the movable contact is provided. Contact device.

3. A plurality of fixed terminals; A movable contactor configured to be capable of being brought into contact with and separated from the plurality of fixed terminals; A metal spring provided below the movable contact; A resin member provided below the spring; a holder member having a bottom, a portion of the bottom being covered with the resin member; A first magnet and a second magnet, Equipped with the holder member has a higher thermal conductivity than the resin member, the bottom of the holder member has an exposed portion exposed from the resin member, a lower end of the spring contacting the exposed portion of the base; The plurality of fixed terminals include a first fixed terminal having a first fixed contact; a second fixed terminal located to the right of the first fixed terminal and having a second fixed contact; Including, The movable contactor is a first movable contact located below the first fixed contact; a second movable contact located below the second fixed contact; having the first magnet is located to the left and in front of the first movable contact, The second magnet is located to the right and in front of the second movable contact. Contact device.

4. The holder member is formed of metal. The contact device according to any one of claims 1 to 3.

5. The spring is a coil spring, The exposed portion has an annular shape. The contact device according to any one of claims 1 to 4.

6. The spring is a coil spring, The resin member is A base and a protrusion protruding upward from the base, The protrusion is located in a hollow portion of the coil spring. The contact device according to any one of claims 1 to 5.

7. The holder member is formed from a single member. The contact device according to any one of claims 1 to 6.

8. The fixed terminal is provided above the movable contact, The movable contactor moves upward to contact the fixed terminal and moves downward to separate from the fixed terminal; The protrusion of the yoke comes into contact with the movable contact when the movable contact moves downward. The contact device according to claim 2 .

9. Further comprising a movable shaft for moving the movable contactor to and from the fixed terminal, At least a portion of the protruding portion of the yoke overlaps with the movable shaft in the up-down direction. The contact device according to claim 2 or 8.

10. A contact device according to any one of claims 1 to 9, an electromagnetic device for moving the movable contactor toward and away from the fixed terminal; Equipped with Electromagnetic relay.

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