Electromagnetic relay

Abstract

An electromagnetic relay (1) has a movable member (5), a plunger (2), and a solenoid section (4) for advancing and retracting the plunger (2). The movable member (5) has a movable contact (51) that contacts and separates from a fixed contact (61). The plunger (2) advances and retracts the movable member (5) to contact and separate the fixed contact (61) from the movable contact (51). The plunger (2) is configured to abut against the movable member (5) via an insulating member (31) and a heat-resistant member (32). The heat-resistant member (32) is sandwiched between the insulating member (31) and the movable member (5). The heat resistance temperature of the heat-resistant member (32) is higher than that of the insulating member (31).

Description

[0001] Citation of relevant applications

[0002] This application is based on Japanese Patent Application No. 2020-042233, filed on March 11, 2020, the contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to an electromagnetic relay. Background Technology

[0004] For example, as disclosed in Patent Document 1, an electromagnetic relay is known, comprising: a movable member having a movable contact that contacts and separates from a fixed contact; a plunger that moves the movable member; and an insulating member that insulates the movable member from the plunger. In this electromagnetic relay, the insulating member prevents current from flowing into the plunger.

[0005] Existing technical documents

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-133843 Summary of the Invention

[0008] When the current flowing through the electromagnetic relay increases, the moving part easily becomes very hot due to the Joule heating caused by energizing. This high temperature, in turn, can cause deformation of the insulating component in contact with the moving part. Deformation of the insulating component can affect the operation of the electromagnetic relay.

[0009] This disclosure provides an electromagnetic relay capable of preventing the influence of heat from a moving part on its operation.

[0010] The first aspect of this disclosure is an electromagnetic relay, which includes:

[0011] A movable member, wherein the movable member has a movable contact that can contact or separate from a fixed contact;

[0012] A plunger, which causes the movable member to move forward and backward, so that the fixed contact and the movable contact can contact and separate; and

[0013] The solenoid section causes the plunger to move forward and backward.

[0014] The plunger is configured to abut against the movable member via an insulating member and a heat-resistant member.

[0015] The aforementioned heat-resistant component is sandwiched between the aforementioned insulating component and the aforementioned movable component.

[0016] The heat-resistant temperature of the above-mentioned heat-resistant components is higher than that of the above-mentioned insulating components.

[0017] The second aspect of this disclosure is an electromagnetic relay, which includes:

[0018] A movable member, wherein the movable member has a movable contact that can contact or separate from a fixed contact;

[0019] A plunger, which causes the movable member to move forward and backward, so that the fixed contact and the movable contact can contact and separate; and

[0020] The solenoid section causes the plunger to move forward and backward.

[0021] The plunger is configured to abut against the movable part via a heat-resistant insulating member.

[0022] The aforementioned heat-resistant insulating component is made of at least one of glass and ceramic.

[0023] In the electromagnetic relay of the first embodiment described above, a heat-resistant component is sandwiched between the insulating component and the movable component. Therefore, even if the current flowing through the electromagnetic relay increases and the movable component becomes hot, the temperature rise of the insulating component can be suppressed. As a result, the heat of the movable component can be prevented from affecting the operation of the electromagnetic relay.

[0024] Furthermore, the heat-resistant insulating component of the electromagnetic relay in the second embodiment insulates the plunger from the movable part. Therefore, even if the current flowing through the electromagnetic relay increases and the movable part becomes hot, the heat-resistant insulating component is less likely to deform. As a result, the heat from the movable part can be prevented from affecting the operation of the electromagnetic relay.

[0025] As described above, an electromagnetic relay that can prevent the heat of the moving part from affecting the operation can be provided.

[0026] Furthermore, the symbols in parentheses in the claims indicate the correspondence with the specific elements described in the following embodiments, and do not limit the technical scope of this disclosure. Attached Figure Description

[0027] The above-mentioned objects, other objects, features, and advantages of this disclosure will become clearer with reference to the accompanying drawings and the following detailed description. The accompanying drawings are described below.

[0028] Figure 1 This is a cross-sectional view of the electromagnetic relay in the state where the heat-resistant component and the movable component are in contact, as described in Embodiment 1.

[0029] Figure 2 This is a cross-sectional view of the electromagnetic relay in the embodiment 1, where the heat-resistant component and the movable component are separated.

[0030] Figure 3 This is a cross-sectional view of the electromagnetic relay in embodiment 2.

[0031] Figure 4 This is a cross-sectional view of the electromagnetic relay in embodiment 3, where the heat-resistant component and the movable component are separated.

[0032] Figure 5 This is a cross-sectional view of the electromagnetic relay in embodiment 3, where the heat-resistant component and the movable component are in contact.

[0033] Figure 6 This is a cross-sectional view of the electromagnetic relay in embodiment 4.

[0034] Figure 7 This is a cross-sectional view of the electromagnetic relay in embodiment 5, where the enlarged diameter portion is in contact with the heat-resistant insulating member.

[0035] Figure 8 This is a cross-sectional view of the electromagnetic relay in embodiment 5, where the enlarged diameter portion is separated from the heat-resistant insulating component. Detailed Implementation

[0036] (Implementation 1)

[0037] Reference Figure 1 , Figure 2 The implementation method of the electromagnetic relay will be described.

[0038] like Figure 1 , Figure 2 As shown, the electromagnetic relay 1 of this embodiment includes a movable member 5, a plunger 2, and a solenoid portion 4 for moving the plunger 2 forward and backward. The movable member 5 has a movable contact 51 that contacts and separates from a fixed contact 61. The plunger 2 moves the movable member 5 forward and backward so that the fixed contact 61 contacts and separates from the movable contact 51.

[0039] The plunger 2 is configured to abut against the movable member 5 via an insulating member 31 and a heat-resistant member 32. The heat-resistant member 32 is sandwiched between the insulating member 31 and the movable member 5. The heat resistance temperature of the heat-resistant member 32 is higher than that of the insulating member 31.

[0040] In this specification, the forward and backward direction Z of the plunger 2 is appropriately referred to as the Z-direction. Furthermore, the direction in which the plunger 2 presses against the movable member 5 in the Z-direction is referred to as the forward direction, and its opposite direction as the rearward direction.

[0041] The electromagnetic relay 1 is used, for example, as a relay installed in charging devices, power conversion devices, etc., of electric vehicles or hybrid vehicles. Moreover, when the electromagnetic relay 1 is connected, a large current of about 100 to 400 A flows through the fixed contact 61 and the movable contact 51.

[0042] The electromagnetic relay 1 has a housing 16 that houses the movable part 5, the plunger 2, and the solenoid section 4. The housing 16 is made of an insulating material such as resin.

[0043] In this embodiment, the movable member 5 is a plate-shaped member made of conductive metal, and movable contacts 51 are included near both ends. The movable member 5 is made of, for example, copper or a copper alloy. Furthermore, a contact pressure spring 14 is sandwiched between the movable member 5 and a portion of the frame 16 disposed on its front side. The contact pressure spring 14 applies a rearward force to the movable member 5. In this embodiment, the contact pressure spring 14 is a coil spring.

[0044] A fixed contact 61 is positioned relative to each of the plurality of movable contacts 51 at a rearward-facing position in the Z direction. The fixed contact 61 is disposed on a stator 6, which is made of a plate-like member of conductive metal. The electromagnetic relay 1 has two stators 6. A fixed contact 61 is disposed on each stator 6. The stators 6 are fixed to the frame 16. A portion of each stator 6 is led out to the outside of the frame 16, and this lead-out portion is configured to connect to external wiring, etc.

[0045] The plunger 2 advances and presses the movable member 5 via the insulating member 31 and the heat-resistant member 32. The movable member 5 advances against the force of the contact pressure spring 14. The plunger 2 is configured to move forward and backward through the operation of the solenoid section 4.

[0046] The solenoid section 4 has an excitation coil 41, a fixed core 42, a movable core 43, and a yoke 44. By energizing the excitation coil 41, the excitation coil 41 forms magnetic flux in the magnetic circuit formed by the fixed core 42, the movable core 43, and the yoke 44.

[0047] The excitation coil 41 is fixedly disposed within the frame 16. The excitation coil 41 is formed by winding a coil around the outer periphery of the cylindrical portion 412 of the winding tube 411. The cylindrical portion 412 is open in two directions in the Z direction. A portion of the plunger 2 is disposed inside the cylindrical portion 412.

[0048] A fixed core 42 made of soft magnetic metal is disposed inside the cylindrical portion 412 of the excitation coil 41. The fixed core 42 and the movable core 43 are disposed opposite each other in the Z direction. The fixed core 42 is disposed behind the movable core 43.

[0049] A return spring 13 is disposed between the fixed core 42 and the movable core 43. The return spring 13 applies force to the movable core 43 in such a way that the movable core 43 faces forward relative to the fixed core 42. That is, the return spring 13 applies force to the movable core 43, thereby applying force to the plunger 2 forward. In this embodiment, the return spring 13 is composed of a helical spring.

[0050] In this embodiment, the plunger 2 has a movable core 43 and a shaft 21 on which the movable core 43 is mounted. The shaft 21 is made of a non-magnetic metal. However, the shaft 21 may also be made of a magnetic metal. Alternatively, the plunger 2 may be configured to consist only of the movable core 43.

[0051] The movable core 43 is fixed to the shaft 21 when the shaft 21 of the plunger 2 is inserted into the insertion hole formed in the movable core 43. Therefore, as Figure 1 , Figure 2 As shown, the movable core 43 and the shaft 21 move integrally. The movable core 43 is made of a soft magnetic metal. At least a portion of the movable core 43 is disposed inside the cylindrical portion 412 of the excitation coil 41.

[0052] An insulating member 31 and a heat-resistant member 32 are provided at the front end of the plunger 2. The insulating member 31 is made of an insulating material such as resin. The heat-resistant member 32 is made of iron or an iron alloy, for example. The insulating member 31 is provided between the plunger 2 and the heat-resistant member 32 when they are not in direct contact with each other.

[0053] As described above, the heat-resistant member 32 has a higher heat resistance temperature than the insulating member 31. The heat-resistant member 32, for example, exhibits heat resistance to the extent that it is difficult to deform even at temperatures above 400°C. Furthermore, the thermal conductivity of the heat-resistant member 32 is lower than that of the movable member 5.

[0054] The insulating member 31 has a rear recess 312 and a front recess 311 that open toward opposite sides in the Z direction. The insulating member 31 is fixed to the shaft portion 21 by pressing the rear recess 312 into the front end of the shaft portion 21.

[0055] In addition, the heat-resistant member 32 has a radially narrowed portion 323 on the rear side. Moreover, the heat-resistant member 32 is fixed to the insulating member 31 by pressing the narrowed portion 323 into the front recess 311 formed on the insulating member 31.

[0056] The insulating member 31 has a clamping portion 313. The clamping portion 313 is clamped between the front end of the shaft portion 21 pressed into the rear recess 312 and the reduced diameter portion 323 of the heat-resistant member 32 pressed into the front recess 311. That is, the heat-resistant member 32 does not contact the shaft portion 21, but is fixed to the shaft portion 21 via the insulating member 31.

[0057] The heat-resistant member 32 has a contact portion 321 that abuts against the movable member 5. The contact portion 321 is generally cylindrical in shape. The contact portion 321 has a contact surface 322 on its front side. When viewed from the Z direction, the contact surface 322 is generally circular (illustration omitted).

[0058] Furthermore, while the plunger 2 makes the contact surface 322 of the heat-resistant member 32 abut against the movable member 5, the movable member 5 moves along the forward and backward direction Z.

[0059] Next, the operation of the plunger 2, which is achieved by energizing the excitation coil 41, will be explained.

[0060] Electromagnetic relay 1, by energizing excitation coil 41, allows magnetic flux to flow through fixed core 42, movable core 43, and yoke 44, generating a magnetic attraction between movable core 43 and fixed core 42. Thus, as... Figure 2 As shown, the plunger 2, including the movable core 43, overcomes the force of the return spring 13 and is attracted and retracted by the fixed core 42. Simultaneously, the movable member 5 retracts towards the fixed contact 61 due to the force of the contact pressure spring 14, and each movable contact 51 contacts the fixed contact 61. As a result, the electromagnetic relay 1 is in the connected state. Thus, current flows from one stator 6 to the other stator 6 via the movable member 5. Furthermore, in the connected state of the electromagnetic relay 1, the contact surface 322 of the heat-resistant member 32 separates from the movable member 5. Then, a gap G is formed between the movable member 5 and the contact surface 322.

[0061] Next, if the excitation coil 41 is de-energized, the magnetic attraction between the fixed core 42 and the movable core 43 disappears. Here, the return spring 13 has a greater force than the contact pressure spring 14. Therefore, in the state where the aforementioned magnetic attraction is absent, the movable core 43 moves forward via the return spring 13, and the movable member 5 is pressed forward by the plunger 2 and moves away from the fixed contact 61. Thus, as... Figure 1 As shown, each movable contact 51 separates from the fixed contact 61, and the electromagnetic relay 1 is in the off state. Additionally, at this time, the contact surface 322 of the heat-resistant member 32 remains in contact with the movable member 5.

[0062] Furthermore, when switching from the connected state to the disconnected state, the contact portion 11 between the fixed contact 61 and the movable contact 51 will not be in the disconnected state during the period when an electric arc is generated. Therefore, in order to break the arc, the electromagnetic relay 1 includes an arc-extinguishing magnet 15. The arc-extinguishing magnet 15 is disposed radially outside the contact portion 11. By means of the arc-extinguishing magnet 15, the electric arc generated in the contact portion 11 is stretched in a direction orthogonal to the forward and backward direction of the movable member 5, thereby extinguishing the arc.

[0063] Next, the effects of this embodiment will be explained.

[0064] In the electromagnetic relay 1 of this embodiment, the heat-resistant member 32 is sandwiched between the insulating member 31 and the movable member 5. Therefore, even if the current flowing through the electromagnetic relay 1 increases and the movable member 5 becomes hot, the temperature rise of the insulating member 31 can be suppressed. As a result, the heat of the movable member 5 can be prevented from affecting the operation of the electromagnetic relay 1.

[0065] As described above, when the electromagnetic relay 1 is in the connected state, a large current flows through the movable element 5. This causes the movable element 5 to reach a high temperature. In this connected state, as... Figure 2 As shown, since the plunger 2 is not pressing the movable member 5, the movement of heat from the movable member 5 to the insulating member 31 is restricted. However, when switching from this connected state to the disconnected state, as... Figure 1 As shown, the plunger 2 is pressed into a high-temperature movable member 5. In this case, the heat from the high-temperature movable member 5 might move to the insulating member 31 disposed at the front end of the plunger 2 through heat transfer. However, a heat-resistant member 32 is provided at the front end of the insulating member 31. Therefore, direct contact between the insulating member 31 and the movable member 5 can be avoided. Thus, deformation of the insulating member 31 due to heat can be prevented.

[0066] Assuming that if the insulating member 31 deforms, for example, the movement or posture of the movable member 5 as it advances through the plunger 2 may become abnormal, making it difficult to obtain a normal cut-off state. According to the electromagnetic relay 1 of this embodiment, as described above, such a situation can be prevented by preventing deformation of the insulating member 31, etc.

[0067] Furthermore, since the movable member 5 is in direct contact with the heat-resistant member 32, deformation of the movable member 5 can be prevented. Moreover, since the heat-resistant member 32 is sandwiched between the movable member 5 and the insulating member 31, as described above, the movement of heat from the movable member 5 to the insulating member 31 is mitigated.

[0068] Furthermore, the heat-resistant component 32 has a lower thermal conductivity than the movable component 5. Therefore, it is more difficult for heat from the movable component 5 to be transferred to the insulating component 31. As a result, the temperature rise of the insulating component 31 can be further suppressed.

[0069] As described above, according to this embodiment, an electromagnetic relay 1 can be provided that can prevent the heat of the movable part 5 from affecting the operation.

[0070] (Implementation Method 2)

[0071] like Figure 3 As shown, this embodiment is an embodiment in which an uneven surface 12 is formed at the contact point between the heat-resistant member 32 and the movable member 5.

[0072] like Figure 3 As shown, the insulating member 31 and the heat-resistant member 32 are fixed to the plunger 2. At least one of the heat-resistant member 32 and the movable member 5 has a concave-convex surface 12 at the contact portion where they abut against each other.

[0073] In this embodiment, the uneven surface 12 is formed on the heat-resistant member 32. Furthermore, the contact portion of the movable member 5 that abuts against the heat-resistant member 32 is a generally flat surface. Moreover, the uneven surface 12 of the heat-resistant member 32 abuts against the movable member 5. That is, a plurality of protrusions protruding towards the movable member 5 are formed on one side of the heat-resistant member 32, and recesses are formed between the protrusions. Furthermore, the front ends of the protrusions abut against the movable member 5.

[0074] The other structures are the same as in Embodiment 1. Furthermore, unless otherwise specified, in Embodiments 2 and later, symbols that are the same as those used in previous embodiments denote the same constituent elements, etc.

[0075] At least one of the heat-resistant member 32 and the movable member 5 has a textured surface 12 at the contact point where they abut each other. Therefore, the contact area between the heat-resistant member 32 and the movable member 5 can be reduced. Consequently, heat from the movable member 5 is more difficult to transfer to the heat-resistant member 32. As a result, the temperature rise of the insulating member 31 can be further suppressed.

[0076] In addition, it has the same effects as in embodiment 1.

[0077] Alternatively, the uneven surface 12 may be provided on the movable part 5 instead of the heat-resistant member 32.

[0078] Alternatively, the concave and convex surfaces 12 can be provided on both the heat-resistant member 32 and the movable member 5. However, in this case, the protrusions of the concave and convex surfaces 12 abut against each other.

[0079] (Implementation Method 3)

[0080] like Figure 4 , Figure 5 As shown, this embodiment is one in which the heat-resistant member 32 is elastic. That is, the heat-resistant member 32 is also an elastic member.

[0081] In this embodiment, the heat-resistant component 32 is formed from a bent or flexed leaf spring. For example... Figure 4 , Figure 5 As shown, the heat-resistant member 32 has an inclined portion 324 on its front side that is inclined relative to the Z direction. In this embodiment, the central axis C of the plunger 2 is arranged along the Z direction.

[0082] Additionally, the heat-resistant member 32 is fixed by pressing its rear portion along the central axis C of the plunger 2 into the front recess 311 formed in the insulating member 31. Figure 4 As shown, when the excitation coil 41 is energized, the tilting part 324 tilts in a manner that separates from the central axis C of the plunger 2 as it moves forward.

[0083] like Figure 4 As shown, when the excitation coil 41 changes from the energized state to the state shown, Figure 5 In the non-energized state shown, the inclined portion 324 abuts against the movable member 5. At this time, the heat-resistant member 32 elastically deforms through the movable member 5.

[0084] That is, such as Figure 4 As shown, when the heat-resistant member 32 is not in contact with the movable member 5 and is in an energized state, the inclined portion 324 is formed such that the angle α between the angle formed by the central axis C of the plunger 2 and the inclined portion 324 is an obtuse angle. Furthermore, as... Figure 5 As shown, when the excitation coil 41 is in a non-energized state, the heat-resistant member 32 elastically deforms by abutting against the movable member 5, thereby bringing the angle α close to 90°. In other words, the heat-resistant member 32 is configured to elastically deform in the Z direction.

[0085] The other structures are the same as in Implementation Method 1.

[0086] The heat-resistant member 32 is also an elastic member. Therefore, when the heat-resistant member 32 comes into contact with the movable member 5, it elastically deforms through the movable member 5. Thus, it can cushion the collision between the heat-resistant member 32 and the movable member 5. As a result, it can reduce the noise of the collision between the heat-resistant member 32 and the movable member 5.

[0087] In addition, it has the same effects as in embodiment 1.

[0088] In addition, the heat-resistant component 32 may also be, for example, an elastic component in the form of a helical spring.

[0089] (Implementation 4)

[0090] like Figure 6 As shown, this embodiment is an embodiment in which a heat-resistant insulating member 30 is provided on the plunger 2.

[0091] like Figure 6 As shown, the electromagnetic relay 1 of this embodiment includes a movable member 5, a plunger 2, and a solenoid portion 4 for advancing and retracting the plunger 2. The movable member 5 has a movable contact 51 that contacts and separates from a fixed contact 61. The plunger 2 advances and retracts the movable member 5 to bring the fixed contact 61 into contact with and separate from the movable contact 51. The plunger 2 is configured to abut against the movable member 5 via a heat-resistant insulating member 30. The heat-resistant insulating member 30 is made of at least one of glass and ceramic.

[0092] When the heat-resistant insulating component 30 is made of ceramic, it can be formed, for example, from alumina or zirconium oxide.

[0093] In the plunger 2 of this embodiment, instead of a heat-resistant member 32 and an insulating member 31, a heat-resistant insulating member 30 that combines both insulation and heat resistance is provided. The heat-resistant insulating member 30 is provided at the front end of the shaft portion 21. The heat-resistant insulating member 30 has an abutment surface 301 that abuts against the movable member 5. In addition, the thermal conductivity of the heat-resistant insulating member 30 is lower than that of the movable member 5.

[0094] The other structures are the same as in Implementation Method 1.

[0095] In this embodiment, the heat-resistant insulating member 30 of the electromagnetic relay 1 insulates the plunger 2 from the movable member 5. Therefore, even if the current flowing through the electromagnetic relay 1 increases and the movable member 5 becomes hot, the heat-resistant insulating member 30, being heat-resistant, is unlikely to deform. As a result, the heat from the movable member 5 can be prevented from affecting the operation of the electromagnetic relay 1.

[0096] Furthermore, the thermal conductivity of the heat-resistant insulating member 30 is lower than that of the movable member 5. Therefore, it is more difficult for heat from the movable member 5 to be transferred to the heat-resistant insulating member 30. As a result, the temperature rise of the heat-resistant insulating member 30 can be suppressed.

[0097] Furthermore, the electromagnetic relay 1 in this embodiment is configured such that a heat-resistant insulating member 30, which includes both heat resistance and insulation properties, insulates the plunger 2 from the movable member 5. Therefore, while simplifying the electromagnetic relay 1, it is possible to prevent the heat from the movable member 5 from affecting the operation of the electromagnetic relay 1.

[0098] In addition, it has the same effects as in embodiment 1.

[0099] (Implementation Method 5)

[0100] like Figure 7 , Figure 8 As shown, this embodiment is an embodiment in which the heat-resistant insulating member 30 is disposed on the movable member 5.

[0101] Furthermore, the front end of the plunger 2 is configured to abut against the heat-resistant insulating member 30 provided on the rear side of the movable member 5.

[0102] like Figure 7 , Figure 8 As shown, an enlarged diameter portion 211 is formed at the front end of the shaft portion 21 of the plunger 2, which enlarges a portion of the shaft portion 21. Furthermore, as... Figure 7 As shown, when the excitation coil 41 is not energized, the heat-resistant insulating member 30 provided on the movable member 5 abuts against the contact surface 212 of the expanded diameter portion 211. That is, the front end of the plunger 2 is configured to directly abut against the heat-resistant insulating member 30 provided on the movable member 5.

[0103] In the heat-resistant insulating member 30, a flat surface 302 is formed on the side opposite to the contact surface 212 of the enlarged diameter portion 211. The area of ​​the flat surface 302 is larger than the area of ​​the contact surface 212. Moreover, the entire contact surface 212 abuts against the flat surface 302.

[0104] The other structures are the same as in Implementation Method 4.

[0105] In this embodiment, a heat-resistant insulating member 30 is provided on the movable member 5. Therefore, it is not necessary to provide an insulating member on the plunger 2. As a result, the plunger 2 can have a simple structure.

[0106] In addition, it has the same effects as in embodiment 4.

[0107] Alternatively, instead of the heat-resistant insulating member 30, the structure can be configured such that the insulating member 31 and the heat-resistant member 32 are disposed on the movable member 5. In this case, the heat-resistant member 32 is fixed to the movable member 5, and the insulating member 31 is fixed to the rear side of the heat-resistant member 32.

[0108] In embodiments 1 to 5 described above, the movable member 5 is pressed forward by the plunger 2, causing the fixed contact 61 to separate from the movable contact 51. However, it is also possible to press the movable member forward by the plunger, causing the movable contact to abut against the fixed contact. In this case, the fixed contact is located further forward than the movable member.

[0109] When the excitation coil is energized, the movable contact separates from the fixed contact due to the retraction of the plunger, thus achieving an off state. Conversely, when the excitation coil is de-energized, the plunger moves the movable member forward, and the electromagnetic relay becomes connected. In this case, besides placing the insulating and heat-resistant components, or a heat-resistant insulating component, on either the plunger or the movable member, the insulating and heat-resistant components can be separately placed on the plunger and the movable member. That is, the heat-resistant component can be placed on the movable member, and the insulating component on the plunger. This ensures insulation between the plunger and the movable member and prevents the insulating component from deforming due to heat.

[0110] This disclosure is not limited to the above-described embodiments, and can be applied to various embodiments without departing from the spirit of the invention.

[0111] Although this disclosure has been described with reference to embodiments, it should be understood that this disclosure is not limited to those embodiments or structures. This disclosure also includes various modifications and equivalent variations. In addition, various combinations and methods, including combinations and methods with only one element, or more than one or fewer elements, also fall within the scope and concept of this disclosure.

Claims

1. An electromagnetic relay, comprising: A movable member having a movable contact that can contact and separate from a fixed contact; A plunger that causes the movable member to move forward and backward, so that the fixed contact contacts and separates from the movable contact; and The solenoid section causes the plunger to move forward and backward. The plunger is configured to abut against the movable member via an insulating member and a heat-resistant member. The heat-resistant component is sandwiched between the insulating component and the movable component. The heat-resistant component has a higher heat resistance temperature than the insulating component. The insulating member and the heat-resistant member are disposed between the plunger and the movable member in the forward and backward direction of the plunger, and the plunger, the insulating member, the heat-resistant member, and the movable member move integrally in the forward and backward direction of the plunger. The insulating member has an open rear recess and a front recess on opposite sides in the Z direction, respectively. The insulating member is fixed to the plunger by pressing the rear recess into the front end of the plunger. The heat-resistant component has a radially narrowed portion on its rear side. The heat-resistant member is fixed to the insulating member by pressing the reduced diameter portion into the front recess formed on the insulating member.

2. The electromagnetic relay as described in claim 1, characterized in that, The heat-resistant component has a lower thermal conductivity than the movable component.

3. The electromagnetic relay as described in claim 1, characterized in that, The insulating member and the heat-resistant member are fixed to the plunger, and at least one of the heat-resistant member and the movable member has a concave-convex surface at the abutting portion where they abut against each other.

4. The electromagnetic relay as described in claim 2, characterized in that, The insulating member and the heat-resistant member are fixed to the plunger, and at least one of the heat-resistant member and the movable member has a concave-convex surface at the abutting portion where they abut against each other.

5. The electromagnetic relay as described in any one of claims 1 to 4, characterized in that, The heat-resistant component is also an elastic component.

6. An electromagnetic relay, comprising: A movable member having a movable contact that can contact and separate from a fixed contact; A plunger that causes the movable member to move forward and backward, so that the fixed contact contacts and separates from the movable contact; and The solenoid section causes the plunger to move forward and backward. The plunger is configured to abut against the movable member via a heat-resistant insulating member. The heat-resistant insulating component is made of at least one of glass and ceramic. The heat-resistant insulating member is disposed between the plunger and the movable member in the forward and backward direction of the plunger, and the plunger, the heat-resistant insulating member, and the movable member move integrally in the forward and backward direction of the plunger. The front end of the plunger abuts against the heat-resistant insulating member located behind the movable member.

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